125836 Catalog

2014-09-05

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commercial HEAT TRACING
Products and services
THERMAL MANAGEMENT SOLUTIONS

WWW.PENTAIRTHERMAL.COM

BUILDING &
INFRASTRUCTURE SOLUTIONS
We provide quality solutions for winter safety, comfort and
performance to building and infrastructure design, construction, operation and maintenance professionals. From pipe
freeze protection to maintaining fluid temperatures and
melting snow, detecting leaks or heating floors, you can rely
on Pentair Thermal Managements’ solutions & services for
greater safety, comfort and performance.

the heart of our solutions
As the inventor of self-regulating heat tracing, our Raychem
brand is recognized for technical leadership in the industries
we serve. Raychem cable delivers the appropriate amount
of heat exactly when and where it is needed, adjusting the
output produced in response to ambient and process conditions, making it ideal for heat management systems. Since
inventing the technology, Pentair Thermal Management has
sold over one billion feet of Raychem brand self-regulating
cable. In addition to a self-regulating product set addressing
a full range of temperature needs, we also offer other types
of heating cables, control and monitoring solutions, and a full
range of services related to our products.
The Pyrotenax brand mineral insulated heating cables and
wiring have led the industry for more than 75 years. Able to
withstand extreme, harsh environments, Pyrotenax cables
provide the most reliable heat-tracing solution for hightemperature applications.
The DigiTrace line of products offers the industry's most
complete range of dedicated heat-tracing control and
monitoring systems, from simple thermostats to
advanced networked systems, with easy-to-use
interface technologies that put information and
programming at your fingertips.
The Tracer Turnkey Solutions Team is widely regarded as
the premiere provider of turnkey heat-tracing solutions.
With our full suite of services, from design to installation,
we are capable of handling heat-tracing projects of any size
and scope. By focusing on safety and utilizing time-tested
methods and solutions, Pentair Thermal Management's
heat-tracing designs and installations are timely, thorough,
and cost-effective.
Rely on Pentair Thermal Managements’ solutions & services
for greater safety, comfort and performance for your buildings and infrastructure projects.

PENTAIR MANAGEMENT SOLUTIONS
THERMAL

Pipe Freeze
Protection
and Flow
Maintenance

Heat Tracing

Roof & Gutter
De-Icing

Snow Melting

Floor Heating

Fire Sprinkler
System Freeze
Protection

Fire and
Performance
Wiring

Leak Detection

Turnkey
Solutions

Roof and
Gutter
De-Icing

commercial heat-tracing
offering
This brochure highlights our heat tracing products and services for the commercial construction industry. Our commercial heating products are used in
the following applications:

Surface Snow
Melting – MI

• Pipe Freeze Protection & Flow Maintenance
• Roof & Gutter De-Icing
• Surface Snow Melting & Anti-Icing
• Freezer Frost Heave Prevention
• Floor Heating
• Hot Water Temperature Maintenance

Surface Snow
Melting and
Anti-Icing –
ElectroMelt

Freezer Frost
Heave
Prevention

Floor Heating

Technical
Data Sheets

Applications
pipe freeze protection
and flow maintenance
In cold locations, thermal insulation alone cannot keep water pipes from
freezing, nor can it keep grease disposal and fuel lines free flowing. The
Raychem XL-Trace self-regulating heating cable system prevents general
water pipes and fire sprinkler lines from freezing and provides flow
maintenance for grease and fuel lines.
Raychem XL-Trace System
Raychem XL-Trace
System for Flow
Maintenance

The energy-efficient XL-Trace heating cable keeps total operating costs
down by adjusting power output in response to ambient temperatures.
Easy to install, the XL-Trace cable can be cut to length on site and overlapped at valves, flanges, and pumps.

PENTAIR MANAGEMENT SOLUTIONS
THERMAL

roof & gutter de-icing
Roofs and gutters can be severely damaged by ice buildup. Heavy icicles
can fall and cause serious injury. Standing water can leak through to
interior walls and furnishings. The Raychem IceStop system helps you
avoid these problems.
Raychem IceStop System

Raychem IceStop System for Roof & Gutter De-Icing

The IceStop self-regulating heating cable can be cut to length for easy
installation in plastic, copper, steel, or aluminum gutters, and on flat or
pitched roofs, valleys and overhangs. The low operating temperature of
the heating cable also makes it safe for use on modern membrane roofs.

commercialFloorheating
heat tracing

iii

Applications
surface snow melting &
anti-icing

Raychem ElectroMelt
System

In winter, snow and ice can accumulate on outdoor concrete and asphalt
surfaces used by people and vehicles. Proven, reliable and efficient,
Pyrotenax MI and Raychem ElectroMelt snow melting systems keep sidewalks, stairways, driveways, parking garage ramps, loading docks, store
entryways, and other areas free of snow and ice during even the worst
weather conditions.

Pyrotenax MI Snow
Melting System

Pyrotenax MI System

The Raychem ElectroMelt system incorporates a rugged cut-to-length
self-regulating heating cable that automatically adjusts power output in
response to concrete temperature.
The Pyrotenax MI system incorporates a rugged copper mineral insulated
constant wattage heating cable that is protected by a high density
polyethylene outer jacket.

PENTAIR MANAGEMENT SOLUTIONS
THERMAL

freezer frost heave
prevention
Subfreezing temperatures inside cold rooms and freezers cause heat to
be lost from the soil under the floor, even when it is well insulated.

Raychem RaySol System

Raychem RaySol or
Pyrotenax MI System
for Freezer Frost Heave
Prevention

Pyrotenax MI System

As the soil freezes, capillary action draws water into the frozen areas
where the water forms a concentrated ice mass. As the ice mass grows,
it heaves the freezer floor and columns, causing damage. Installing
Raychem RaySol or Pyrotenax MI heating cables in the subfloor under the
freezer-floor insulation can prevent this problem.

commercialFloorheating
heat tracing

Applications
floor heating
Floor heating is becoming increasingly desirable in office buildings,
hotels, garages and homes. Pentair Thermal Management offer solutions
for the following floor heating applications:
• Heat-loss replacement as a heat source to prevent the floor over a cold space
from cooling below room temperature
A

Raychem RaySol System

• Comfort floor heating as a supplemental heat source
• Radiant space heating as a primary heat source

Pentair Thermal Management
offers multiple solutions for each
of these applications, including
Raychem RaySol, Pyrotenax MI,
and the Raychem QuickNet floor
heating system.
Pyrotenax MI System

Raychem QuickNet
System for Comfort
Floor Heating
QuickNet Floor Heating
System

PENTAIR MANAGEMENT SOLUTIONS
THERMAL

hot water temperature
maintenance
Recirculation systems in large commercial buildings can lead to high
energy costs and wasted water. The Raychem HWAT system is a simple,
reliable alternative to recirculation. Attached to hot-water supply pipes,
HWAT heating cables compensate for heat loss and maintain hot water
temperature throughout the building.

Raychem HWAT System

ART T

Engineered for direct installation on hot-water supply pipes to maintain
water temperature, HWAT heating cables eliminate the need for return
piping valves, or pumps. This lowers installation cost and takes up
less building space. The HWAT system’s energy savings, water savings
and minimal maintenance requirements significantly reduces building
operating costs.

For HWAT design
assistance, please refer to
the Hot Water Temperature
Maintenance Product
Selection and Design Guide
(H57538)

Raychem HWAT System for Hot
Water Temperature Maintenance

commercialFloorheating
heat tracing

vii

commercial heating products
Raychem Self-Regulating
Heating Cables
Raychem self-regulating heating cables consist of two parallel conductors
embedded in a conductive polymer heating core. The core is radiationcross linked to ensure long-term reliability. The self-regulating heating
cable automatically adjusts power output to compensate for temperature
changes. As the temperature drops, the number of electrical paths
through the core increases and more heat is produced. Conversely, as the
temperature rises, the core has fewer electrical paths and less heat is
produced.

XL-Trace

ElectroMelt

IceStop

RaySol

HWAT

Pipe Freeze
Protection and Flow
Maintenance

Surface Snow Melting
and Anti-Icing

Roof and Gutter
De-Icing

Floor Heating,
Heat-Loss
Replacement and
Freezer Frost
Heave Prevention

Hot Water Temperature
Maintenance

Raychem Connection Kits and Accessories

Raychem power, splice tee and end seal kits and accessories are vital parts of the heat-tracing system.
RayClic-PC Power Connection

GMK-RC Roof Clip

GMK-RAKE Hanger
Bracket

RayClic-LE Lighted End Seal

viii

PENTAIR MANAGEMENT SOLUTIONS
THERMAL

Raychem floor heating mat

QuickNet
Comfort Floor Heating

re
g

Constant Wattage

lf-

Resistance

Raychem Self-Regulating Heating Cables

Power

Temperature

How self-regulation works in
Raychem conductive-polymer heaters:

Constant Wattage
Se

lf-

re
g

ing

Temperature

At low temperature,
there are many
conducting paths,
resulting in high output
and rapid heat-up. Heat
is generated only when
it is needed and
precisely where it is

At moderate
temperature, there are
fewer conducting paths
because the heating
cable efficiently adjusts
by decreasing output,
eliminating any
possibility of
overheating.

At high temperature,
there are few
conducting paths and
output is
correspondingly lower,
conserving energy
during operation.

commercialFloorheating
heat tracing

Pyrotenax Mineral
Insulated Heating Cables
Pyrotenax mineral insulated heating cables consist of a single or dual
conductor surrounded by magnesium oxide insulation, a solid copper
sheath, and an extruded high density polyethylene jacket. The mineral
insulated series-type technology provides a reliable and constant heat
source that is ideal for surface snow melting, anti-icing, floor heating,
and freezer frost heave prevention.

copper mi heating cables

Roof and Gutter De-Icing, and Floor Heating

HDPE jacketed copper mi heating cables

Roof and Gutter De-Icing, Surface Snow Melting, Anti-Icing, Freezer Frost
Heave Prevention, and Floor Heating

alloy 825 mi heating cables

Surface Snow Melting, Anti-Icing, and Floor Heating

PENTAIR MANAGEMENT SOLUTIONS
THERMAL

Control & Monitoring
Systems

thermostats

Our thermostats provide simple
on/off control for pipe freeze
protection, flow maintenance
applications, and floor
heating.

EC-TS

AMC-1A

AMC-F5

QuickStat-TC

electronic controllers and sensors

Our microprocessor-based controllers provide accurate control and
feedback for critical heat-tracing
applications, including freeze
protection for sprinkler piping
systems.
ETI® snow controllers automatically energize snow melting, and
roof and gutter de-icing systems
when both precipitation and low
temperature are detected.

C910-485

APS-4C

ACS-30

ECW-GF

CIT-1

SIT-6E

GIT-1

power distribution

DigiTrace dedicated powerdistribution panels reduce costly
field wiring and controller costs.
Available for heat tracing, surface
snow melting, anti-icing, and roof
and gutter de-icing applications.

SMPG

HTPG

commercialFloorheating
heat tracing

web services and software
visit www.pentairthermal.com

All the tools and information you need to design, select, and purchase a
complete system for any commercial heating application. Use our Webbased Design Wizards. Download, print, browse product information, or
submit a question.
on-line technical support

On our interactive frequently asked questions and answers (FAQ) page,
you’ll find questions broken down by markets and product lines. If your
question does not appear, simply submit a new question. A Pentair
Thermal Management technical expert will answer your question and post
it to the web site.

design tools

XL-ERATE

SnoCalc

HotCAP

XL-ERATE is an on-line commercial pipe freeze protection and
flow maintenance design tool. The
program generates a complete
Raychem XL-Trace bill of material
and can also facilitate a quotation
if desired.

SnoCalc is an on-line surface snow
melting design tool that selects the
appropriate heating cables, connection kits and accessories. Your
design information, from cable
selection to circuit length, cable
power and more, are all displayed
and available for download. The
program also selects a control
solution and even allows you to
submit a request for quote online.

HotCAP is a hot water cost
analysis program that compares
the relative economics between
the Raychem HWAT system and a
recirculation system. Comparisons
include installation and operating costs as well as time-to-tap,
wasted water, and life cycle.

ACS-30 Program Integrator
The ACS-30 Program Integrator is
a utility used on Microsoft Windows
PCs that allows the user to easily
set up circuit databases—providing
invaluable help for commissioning
the heating cable control system.

xii

PENTAIR MANAGEMENT SOLUTIONS
THERMAL

PENTAIR THERMAL
MANAGEMENT NORTH
AMERICAN OPERATIONS

Fort McMurray, Alberta
Edmonton, Alberta

Seattle, WA
Trenton, Ontario
Milton, Ontario
Chicago, IL

Menlo Park, CA
Redwood City, CA

Houston, TX

Worldwide Headquarters

Before you buy, weigh the facts:
Greater selection
Offering the most complete product line of proven heating
technologies to better satisfy your unique needs.
More innovation

Philadelphia, PA

Baton Rouge, LA

Headquarters
Service/Sales Centers
Manufacturing Centers

For Proven Heating
Solutions, Look to
the Leader.
Visit our web site at
www.pentairthermal.com or
contact us at 1-800-545-6258.

As a world leader in heating cable technologies, design
optimization, construction, and control and monitoring
systems, we invented many of today’s industry standards.
More manufacturing experience
Quality-driven manufacturing processes, combined with
years of manufacturing self-regulating and mineralinsulated cables gives you products proven to be the most
reliable.
commercialFloorheating
heat tracing

xiii

Pipe Freeze Protection
and Flow Maintenance
Fire Sprinkler System
Freeze Protection

Design Guides

Roof and Gutter
De-Icing

This section provides individual design guides for Pentair Thermal Management
Commercial Heating products. These design guides are also available in .pdf format
on our web site at www.pentairthermal.com
Contents
Pipe Freeze Protection and Flow Maintenance — XL-Trace System. . . . . . . . . . . . . . 3
Fire Sprinkler System Freeze Protection — XL-Trace System. . . . . . . . . . . . . . . . . . 47
Roof and Gutter De-Icing — IceStop System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Surface Snow
Melting – MI

Surface Snow Melting – MI Mineral Insulated Heating Cable System . . . . . . . . . . 127
Surface Snow Melting and Anti-Icing – ElectroMelt. . . . . . . . . . . . . . . . . . . . . . . . . 169
Freezer Frost Heave Prevention – RaySol and MI Heating Cable System. . . . . . . . 203

Surface Snow
Melting – ElectroMelt

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating Systems. . . . . 259

Freezer Frost
Heave Prevention
Floor Heating

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection
and Flow Maintenance
Fire Sprinkler System
Freeze Protection

Pipe Freeze Protection and flow
Maintenance — XL-Trace System

Roof and Gutter
De-Icing

This step-by-step design guide provides the tools necessary to design a Raychem
XL-Trace pipe freeze protection or flow maintenance system. For other applications
or for design assistance, contact your Pentair Thermal Management representative
or phone Pentair Thermal Management at (800) 545‑6258. Also, visit our web site at
www.pentairthermal.com.

Surface Snow
Melting – MI

Contents
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
How to Use this Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Safety Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
System Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
XL-Trace Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Self-Regulating Heating Cable Construction. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pipe Freeze Protection Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical Pipe Freeze Protection System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
General Water Piping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Flow Maintenance Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Typical Flow Maintenance System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Greasy Waste Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Fuel Lines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Pipe Freeze Protection and Flow Maintenance Design . . . . . . . . . . . . . . . . . . . . . . . 14
Design Step by Step. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Step 1 Determine design conditions and pipe heat loss. . . . . . . . . . . . . . . 14
Step 2 Select the heating cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Step 3 Determine the heating cable length . . . . . . . . . . . . . . . . . . . . . . . . . 22
Step 4 Determine the electrical parameters . . . . . . . . . . . . . . . . . . . . . . . . 24
Step 5 Select the connection kits and accessories . . . . . . . . . . . . . . . . . . . 28
Step 6 Select the control system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Step 7 Select the power distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Step 8 Complete the Bill of Materials. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
XL-Trace System Pipe Freeze Protection and Flow Maintenance
Design Worksheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Surface Snow
Melting – ElectroMelt
Freezer Frost
Heave Prevention

Introduction
Floor Heating

This design guide presents Pentair Thermal Management’s recommendation for
designing an XL-Trace pipe freeze protection and flow maintenance system for the
following applications:
• Freeze protection of general water piping (aboveground and buried)
• Flow maintenance of waste lines (aboveground and buried)
• Flow maintenance of fuel lines (aboveground)

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection and flow Maintenance — XL-Trace System
This guide does not cover applications in which any of the following conditions exist:
• Hazardous locations, as defined in the national electrical codes
• Pipe temperature other than specified in Table 1 on page 5
• Pipe maintenance temperatures above 150°F (65°C)
• Supply voltage other than 120 V or 208–277 V
For designing XL-Trace pipe freeze protection system for fire sprinkler
piping, please refer to the XL-Trace System for Fire Sprinkler Freeze Protection
Design Guide (H58489).
If your application conditions are different, or if you have any questions, contact your
Pentair Thermal Management representative or contact Pentair Thermal
Management directly at (800) 545‑6258.
How to Use this Guide
This design guide presents Pentair Thermal Management’s recommendations
for designing an XL-Trace pipe freeze protection or flow maintenance system. It
provides design and performance data, electrical sizing information, and application
configuration suggestions. Following these recommendations will result in a reliable,
energy-efficient system.
Other Required Documents

This guide is not intended to provide comprehensive installation instructions. For
complete XL-Trace pipe freeze protection and flow maintenance system installation
instructions, please refer to the following additional required documents:
• XL-Trace System Installation and Operation Manual (H58033)
• Additional installation instructions are included with the connection kits, thermostats, controllers, and accessories
If you do not have these documents, you can obtain them from the Pentair Thermal
Management web site at www.pentairthermal.com.
For products and applications not covered by this design guide, please contact your
Pentair Thermal Management representative or call Pentair Thermal Management
directly at (800) 545-6258.
Safety Guidelines
As with any electrical equipment, the safety and reliability of any system depends
on the quality of the products selected and the manner in which they are installed
and maintained. Incorrect design, handling, installation, or maintenance of any of
the system connection kits could damage the system and may result in inadequate
performance, overheating, electric shock, or fire. To minimize these risks and to
ensure that the system performs reliably, read and carefully follow the information,
warnings, and instructions in this guide.
This symbol identifies important instructions or information.
This symbol identifies particularly important safety warnings that must be
followed.
WARNING: To minimize the danger of fire from sustained electrical arcing
if the heating cable is damaged or improperly installed, and to comply with the
requirements of Pentair Thermal Management, agency certifications, and national
electrical codes, ground-fault equipment protection must be used on each heating
cable branch circuit. Arcing may not be stopped by conventional circuit protection.

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

THERMAL MANAGEMENT SOLUTIONS

Warranty
Pentair Thermal Management’s standard limited warranty applies to all products.

An XL-Trace system includes the heating cable, power connection, splice, tee
connections, controls, contactors, power distribution panels, accessories, and the
tools necessary for a complete installation.

Roof and Gutter
De-Icing

The XL-Trace system provides freeze protection and flow maintenance for
aboveground and buried pipe applications. The XL-Trace system is based on selfregulating heating cable technology. Pentair Thermal Management offers the option
of three self-regulating heating cables with the XL-Trace system: 5XL, 8XL, and 12XL
(208–277 V only) for applications using 120 and 208–277 V power supplies. The cable’s
output is reduced automatically as the pipe warms, so there is no possibility of
failure due to overheating.

Fire Sprinkler System
Freeze Protection

System Overview

An extension of the limited warranty period to ten (10) years from the date of
installation is available if a properly completed online warranty form is submitted
within thirty (30) days from the date of installation. You can access the complete
warranty on our web site at www.pentairthermal.com.

Pipe Freeze Protection
and Flow Maintenance

System Overview

XL-Trace Applications
Surface Snow
Melting – MI

Identify which of the standard XL-Trace applications below pertain to your
installation. Proceed to the appropriate design sections that follow.
Table 1 XL-Trace Applications
Application

Specific application
requirements

Description

Pipe freeze protection

Surface Snow
Melting – ElectroMelt

“Aboveground piping” on page 8
“Buried piping,” page 9

General water piping Freeze protection (40°F [4°C]
minimum) of insulated, metal
or plastic water piping

Flow maintenance
Greasy waste lines

Flow maintenance (110°F
[43°C] minimum) for insulated
greasy waste lines

“Aboveground piping” on page 11
“Buried piping” on page 12

Fuel lines

Flow maintenance (40°F [4°C]
minimum) for insulated metal
piping containing #2 fuel oil

“For aboveground piping only,”
page 13

Freezer Frost
Heave Prevention

Note: If your application does not fit these guidelines, contact your local Pentair
Thermal Management representative or call (800) 545-6258.

Floor Heating

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection and flow Maintenance — XL-Trace System
Self-Regulating Heating Cable Construction
Raychem XL-Trace self-regulating heating cables are comprised of two parallel
nickel-plated bus wires in a cross-linked polymer core, a tinned copper braid, and a
fluoropolymer or polyolefin outer jacket. These cables are cut to length, simplifying
the application design and installation.

Polyolefin or
fluoropolymer outer jacket
Tinned-copper braid
Modified polyolefin inner jacket
Self-regulating conductive core
Nickel-plated copper bus wire

Fig. 1 XL-Trace heating cable construction

With self-regulating technology, the number of electrical paths between bus wires
changes in response to temperature fluctuations. As the temperature surrounding
the heater decreases, the conductive core contracts microscopically. This contraction
decreases electrical resistance and creates numerous electrical paths between the
bus wires. Current flows across these paths to warm the core.
As the temperature rises, the core expands microscopically. This expansion
increases electrical resistance and the number of electrical paths decreases. The
heating cable automatically reduces its output.
At high temperature,
there are few
conducting paths
and output is
correspondingly
lower, conserving
energy during
operation.

The following graphs illustrate the response of self-regulating heating
cables to changes in temperature. As the temperature rises, electrical
resistance increases, and our heaters reduce their power output.

re
g

Power

Constant wattage

lf-

At moderate temperature,
there are fewer conducting
paths because the heating
cable efficiently adjusts by
decreasing output, eliminating
any possibility of overheating.

Resistance

At low temperature,
there are many
conducting paths,
resulting in high output
and rapid heat-up. Heat
is generated only when it
is needed and precisely
where it is needed.

Constant wattage

lf-

re
g

ing

Temperature

Fig. 2 Self-regulating heating cable technology

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection Applications
A pipe freeze protection system is designed to maintain the pipe temperature at a
minimum of 40°F (4°C) to prevent freezing.

A typical pipe freeze protection system includes the XL-Trace self-regulating heating
cables, connection kits, ambient temperature control, and power distribution.

Electronic Controller

Fire Sprinkler System
Freeze Protection

Typical Pipe Freeze Protection System

Pipe Freeze Protection
and Flow Maintenance

Pipe Freeze Protection Applications

Power Distribution Panel

Roof and Gutter
De-Icing

Tee Kit
Ambient RTD

Surface Snow
Melting – MI

End Seal Kit
Heating Cable

Surface Snow
Melting – ElectroMelt

Lighted End Seal

Splice Kit

Freezer Frost
Heave Prevention

Power Connection Kit

Cross Kit

Floor Heating

Fig. 3 Typical XL-Trace pipe freeze protection system

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection and flow Maintenance — XL-Trace System
General Water Piping
General water piping is defined as metal or plastic water piping located in
nonhazardous locations.
Aboveground piping
Junction
box
RayClic-PC
power connection

DigiTrace C910-485
Electronic controller

RayClic-LE
lighted end seal
(optional)

RayClic-S
splice

Insulation

XL-Trace
heating cable

RayClic-T
tee

RayClic-E
end seal

Fig. 4 Typical aboveground piping system

Application Requirements
The system complies with Pentair Thermal Management requirements for
aboveground general water piping when:
• The heating cable is permanently secured to insulated metal pipes with GT-66
glass tape, or to plastic pipes using AT-180 aluminum tape.
• A 30-mA ground-fault protection device (GFPD) is used.
• The heating cable is installed per manufacturer’s instructions with approved Raychem connection kits. See Table 13 on page 29 and the XL-Trace System Installation and Operation Manual (H58033).
Cable Selection
See “Other Required Documents” page 15.
Approvals
UL Listed, FM Approved, and c-CSA-us Certified for nonhazardous locations.
-w
5XL1-CR, -CT
5XL2-CR, -CT

8XL1-CR, -CT
8XL2-CR, -CT

5XL1-CR, -CT
5XL2-CR, -CT

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

8XL1-CR, -CT 12XL2-CR, -CT
8XL2-CR, -CT

11/13

THERMAL MANAGEMENT SOLUTIONS

Buried piping
DigiTrace C910-485
Electronic controller

Fire Sprinkler System
Freeze Protection

Alternate
end seal

RayClic-LE*

FTC-XC
power
connection

Wall

Conduit

with wall
mounting
bracket

Conduit for
temperature
sensor

Pipe Freeze Protection
and Flow Maintenance

Pipe Freeze Protection Applications

Ground

RTD10CS

Roof and Gutter
De-Icing

Junction box
Insulation RayClic-E
end seal

RayClic-PC* Ground

Conduit

with wall
mounting
bracket

XL-Trace
heating cable
with -CT jacket
*To protect the heating cable, run cable
inside Convolex tubing between the
conduit and the RayClic connection kits.

Surface Snow
Melting – MI

Alternate
power connection

Wall

Fig. 5 Typical buried piping system

Application Requirements

• The heating cable is permanently secured to metal pipes with GT-66 glass tape or
to plastic pipes using AT-180 aluminum tape.
• The pipeline is buried at least 2-feet deep.
• All heating cable connections (power, splice, tee, and end termination) are made
above-ground. No buried or in-conduit splices or tees are allowed.
• The heating cable has a fluoropolymer outer jacket (-CT).

• The heating cable is protected from the pipe to the power connection box in UL
Listed and CSA Certified water-sealed conduit (minimum 3/4-inch diameter) suitable for the location.
• A 30-mA ground-fault protection device (GFPD) is used.
• Closed-cell, waterproof thermal insulation with fire-retardant, waterproof covering is used.

Floor Heating

• The heating cable is installed per manufacturer’s instructions with approved
Pentair Thermal Management connection kits. See Table 15 on page 31 and the
XL‑Trace System Installation and Operation Manual (H58033).

Freezer Frost
Heave Prevention

• The power connection and end seal are made in UL Listed and CSA Certified
junction boxes above grade.

Surface Snow
Melting – ElectroMelt

The system complies with Pentair Thermal Management requirements for use on
buried insulated metal or plastic pipe when:

Cable Selection
See “Pipe Heat Loss Calculations,” page 15.
Approvals
UL Listed, FM Approved, and c-CSA-us Certified for nonhazardous locations.
-w

THERMAL MANAGEMENT SOLUTIONS

8XL1-CT
8XL2-CT

5XL1-CT
5XL2-CT

8XL1-CT
8XL2-CT

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

12XL2-CT

11/13

Technical Data
Sheets

5XL1-CT
5XL2-CT

Pipe Freeze Protection and flow Maintenance — XL-Trace System
Flow Maintenance Applications
A flow maintenance system is designed to maintain cooking greasy waste lines and
#2 fuel oil lines above the temperature at which the viscosity inhibits fluid flow.
Typical Flow Maintenance System
A typical flow maintenance system includes the XL-Trace self-regulating heating
cables with a fluoropolymer outer jacket, connection kits, line-sensing temperature
control and power distribution.

Heating Cable

Power Distribution Panel

Splice Kit

Electronic Controller

Powered Tee Kit

Lighted End Seal

RTD

d
ra

G
Fig. 6 Typical XL-Trace flow maintenance system

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

THERMAL MANAGEMENT SOLUTIONS

Greasy Waste Lines

Aboveground piping
Junction
box
RayClic-PC
power
connection

DigiTrace C910-485
Electronic controller

Alternate
end seal

Roof and Gutter
De-Icing

RayClic-E
RTD10CS

RayClic-S
splice

XL-Trace
heating cable
with -CT jacket

Fire Sprinkler System
Freeze Protection

Greasy waste lines are defined as piping used for the disposal of waste oils and fats
created in the cooking process. Typical applications include greasy waste lines from
commercial restaurants. A grease-line flow maintenance system is designed to
maintain a 110°F (43°C) minimum fluid temperature.

Pipe Freeze Protection
and Flow Maintenance

Flow Maintenance Applications

Insulation

Surface Snow
Melting – MI

RayClic-LE
lighted end seal

RayClic-SB-04
pipe mounting bracket

Fig. 7 Typical aboveground piping system

Application Requirements
Surface Snow
Melting – ElectroMelt

The system complies with Pentair Thermal Management requirements for
aboveground greasy waste lines when:
• The heating cable is permanently secured to metal pipes with GT-66 glass tape,
or to plastic pipes using AT-180 aluminum tape.
• The heating cable must have a fluoropolymer outer jacket (-CT).
• A 30-mA ground-fault protection device (GFPD) is used.
• Tees and splices are installed using pipe mounting brackets, not in direct contact
with piping.

Cable Selection
See “Pipe Heat Loss Calculations,” page 15.

Freezer Frost
Heave Prevention

• The heating cable is installed per manufacturer’s instructions with approved Pentair Thermal Management connection kits. See Table 13 on page 29 and the XLTrace System Installation and Operation Manual (H58033).

Approvals
Floor Heating

XL-Trace systems (-CT only) are UL Listed, FM Approved, and c-CSA-us Certified for
nonhazardous locations.
-w
5XL1-CT
5XL2-CT

5XL1-CT
5XL2-CT

8XL1-CT
8XL2-CT

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

12XL2-CT

11/13

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

8XL1-CT
8XL2-CT

Pipe Freeze Protection and flow Maintenance — XL-Trace System
Buried piping
DigiTrace C910-485
Electronic controller
Alternate
end seal

Wall

RayClic-LE*

FTC-XC
power
connection
Conduit

with wall
mounting
bracket

Conduit for
temperature
sensor

Ground

RTD10CS
Junction box
Insulation RayClic-E
end seal

RayClic-PC* Ground

Conduit

with wall
mounting
bracket

XL-Trace
heating cable
with -CT jacket
Alternate
power connection

*To protect the heating cable, run cable
inside Convolex tubing between the
conduit and the RayClic connection kits.

Wall

Fig. 8 Typical buried greasy waste line

Application Requirements
The system complies with Pentair Thermal Management requirements for buried
greasy waste lines when:
• The heating cable is permanently secured to metal pipes with GT-66 glass tape,
or to plastic pipes using AT-180 aluminum tape.
• The heating cable must have a fluoropolymer outer jacket (-CT).
• The pipeline is buried at least 2-feet deep.
• All heating cable splices or tees are made aboveground. No buried or in-conduit
splices or tees are allowed.
• The power connection and end seal are made in UL Listed and CSA Certified
junction boxes above grade.
• The heating cable is protected from the pipe to the power connection box in UL
Listed and CSA Certified conduit (minimum 3/4-inch diameter) suitable for the
location.
• A 30-mA ground-fault protection device (GFPD) is used.
• Closed-cell, waterproof thermal insulation with fire-retardant, waterproof covering is used.
• The heating cable is installed per manufacturer’s instructions with approved
Pentair Thermal Management connection kits. See Table 15 on page 31 and the
XL-Trace System Installation and Operation Manual (H58033).
Cable Selection
See “Heating Cable Catalog Number” on page 19.
Approvals
XL-Trace systems (-CT only) are UL Listed, FM Approved, and c-CSA-us Certified for
nonhazardous locations.
-w
5XL1-CT
5XL2-CT

8XL1-CT
8XL2-CT

5XL1-CT
5XL2-CT

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

8XL1-CT
8XL2-CT

11/13

12XL2-CT

THERMAL MANAGEMENT SOLUTIONS

Fuel Lines
Fuel lines are defined as those carrying #2 fuel oil. A fuel line flow maintenance
system is designed to maintain a 40°F (4°C) minimum fluid temperature to maintain
flow.

Fire Sprinkler System
Freeze Protection

For aboveground piping only

RayClic-PC
power
connection

Junction
box
DigiTrace C910-485
Electronic controller

Roof and Gutter
De-Icing

RTD10CS

Pipe Freeze Protection
and Flow Maintenance

Flow Maintenance Applications

RayClic-S
splice

XL-Trace
heating cable
with -CT jacket

Insulation

RayClic-LE
lighted end seal

Surface Snow
Melting – MI

RayClic-SB-04
pipe mounting bracket

Fig. 9 Typical aboveground piping system

Application Requirements

• The heating cable is permanently secured to metal pipes with GT-66 glass tape or
to plastic pipes using AT-180 aluminum tape.
• The heating cable must have a fluoropolymer outer jacket (-CT).
• Tees and splices are installed using pipe mounting brackets, not in direct contact
with piping.
• A 30-mA ground-fault protection device (GFPD) is used.

Freezer Frost
Heave Prevention

• The heating cable is installed per manufacturer’s instructions with approved
Pentair Thermal Management connection kits. See Table 13 on page 29 and the
XL-Trace System Installation and Operation Manual (H58033).

Surface Snow
Melting – ElectroMelt

The system complies with Pentair Thermal Management requirements for
aboveground #2 fuel oil piping when:

Cable Selection
See “Pipe Heat Loss Calculations,” page 15.
Approvals
XL-Trace systems (-CT only) are UL Listed, FM Approved, and c-CSA-us Certified for
nonhazardous locations.

Floor Heating

-w
5XL1-CT
5XL2-CT

5XL1-CT
5XL2-CT

8XL1-CT
8XL2-CT

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

12XL2-CT

11/13

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

8XL1-CT
8XL2-CT

Pipe Freeze Protection and flow Maintenance — XL-Trace System
Pipe Freeze Protection and Flow Maintenance Design
This section details the design steps necessary to design your application. The
examples provided in each step are intended to incrementally illustrate the project
parameter output for two sample designs from start to finish. As you go through each
step, use the “XL-Trace System Pipe Freeze Protection and Flow Maintenance Design
Worksheet,” page 38, to document your project parameters, so that by the end of
this section you will have the information you need for your Bill of Materials.
XL-Erate, the commercial pipe freeze protection and flow maintenance design
software is available at http://www.pentairthermal.com to assist with your design.
Design Step by Step
Your system design requires the following essential steps.

 Determine design conditions and pipe heat loss
 Select the heating cable
 Determine the heating cable length
 Determine the electrical parameters
 Select the connection kits and accessories
 Select the control system
 Select the power distribution
 Complete the Bill of Materials
Pipe Freeze Protection
and Flow Maintenance
1. Determine design
conditions and
heat loss
2. Select the heating
cable
3. Determine the
heating cable length
4. Determine the
electrical parameters

Step 1 Determine design conditions and pipe heat loss
Collect the following information to determine your design conditions:
• XL-Trace application (from Table 1)
• Location
–– Indoors
–– Outdoors
–– Aboveground
–– Buried

5. Select the
connection kits
and accessories

• Maintain temperature (Tm)

6. Select the control
system

• Minimum ambient temperature (Ta )

7. Select the power
distribution
8. Complete the Bill
of Materials

• Maximum system temperature (Tmax )
• Pipe diameter and material
• Pipe length
• Thermal insulation type and thickness
• Supply voltage
Example: Pipe Freeze Protection – Water Piping
Location

Aboveground, outdoor

Maintain temperature (Tm)

40°F (4°C)

Maximum system temperature (Tmax )

80°F (27°C)

Minimum ambient temperature (Ta )

–20°F (–29°C)

Pipe diameter and material

2-inch plastic

Pipe length

300 ft (91 m)

Thermal insulation type and thickness 1-inch fiberglass
Supply voltage

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

120 V

11/13

THERMAL MANAGEMENT SOLUTIONS

Example: Pipe Freeze Protection – Greasy Waste Line
Location

Buried

Maintain temperature (Tm)

110°F (43°C)
125°F (52°C)

Minimum ambient temperature (Ta )

50°F (10°C) (soil temperature)

Pipe diameter and material

4-inch metal

Pipe length

200 ft (61 m)

Fire Sprinkler System
Freeze Protection

Maximum system temperature (Tmax )

Thermal insulation type and thickness 1-inch rigid cellular urethane
Supply voltage

Pipe Freeze Protection
and Flow Maintenance

Pipe Freeze Protection and Flow Maintenance Design

208 V

Pipe Heat Loss Calculations

+40
+20
0
−20
−40

Thermal insulation thickness

°F

Roof and Gutter
De-Icing

To select the proper heating cable you must first determine the pipe heat loss. To
do this you must first calculate the temperature differential (ΔT) between the pipe
maintain temperature and the minimum ambient temperature.
Minimum
ambient
temperature

80
60
40
20

Surface Snow
Melting – MI

Pipe or
tubing
diameter
°F

Maintain
temperature

Fig. 10 Pipe heat loss

Calculate temperature differential ΔT
Surface Snow
Melting – ElectroMelt

To calculate the temperature differential (ΔT), use the formula below:
ΔT = Tm – Ta
Example: Pipe Freeze Protection – Water Piping
40°F (4°C)

–20°F (–29°C)

ΔT = 40°F – (–20°F) = 60°F

ΔT = 4°C – (–29°F) = 33°C

Freezer Frost
Heave Prevention

Example: Flow Maintenance – Greasy Waste Line
Tm

110°F (43°C)

50°F (10°C)

ΔT = 110°F – (50°F) = 60°F

ΔT = 43°C – (10°C) = 33°C
Floor Heating

Determine the pipe heat loss
Match the pipe size, insulation thickness, and temperature differential (ΔT) from
Table 2 to determine the base heat loss of the pipe (Qb).

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection and flow Maintenance — XL-Trace System
Example: Pipe Freeze Protection – Water Piping
Pipe diameter

2 inch

Insulation thickness 1 inch
ΔT

60°F (33°C)

Heat loss (Qb) for 60°F must be calculated through interpolation between ΔT at 50°F
and ΔT at 100°F from Table 2. For difference between the ΔT of 50°F and the ΔT of
100°F:
Qb-50

3.2 W/ft (from Table 2)

Qb-100

6.8 W/ft (from Table 2)

ΔT interpolation

ΔT 60°F is 20% of the distance between ΔT 50°F and ΔT 100°F

Qb-60

Qb-50 + [0.20 x (Qb-100 – Qb-50)] = 3.2 + [0.20 x (6.8 – 3.2)] = 3.9 W/ft

Pipe heat loss (Qb) 3.9 W/ft @ Tm 40°F (12.9 W/m @ Tm 4°C)
Example: Flow Maintenance – Greasy Waste Line
Pipe diameter

4 inch

Insulation thickness 1 inch
ΔT

60°F (33°C)

Qb for 60°F must be calculated through interpolation between ΔT at 50°F and ΔT at
100°F from Table 2. For difference between the ΔT of 50°F and the ΔT of 100°F:
Qb-50

5.4 W/ft (from Table 2)

Qb-100

11.2 W/ft (from Table 2)

ΔT interpolation

ΔT 60°F is 20% of the distance between ΔT 50°F and ΔT 100°F

Qb-60

Qb-50 + [0.20 x (Qb-100 – Qb-50)] = 5.4 + [0.20 x (11.2 – 5.4)] = 6.6 W/ft

Pipe heat loss Qb 6.6 W/ft @ Tm 110°F (21.5 W/m @Tm 43°C)
Compensate for insulation type and pipe location
The base heat loss is calculated for a pipe insulated with thermal insulation with a
k-factor ranging from 0.2 to 0.3 BTU/hr–°F-ft2/in (fiberglass or foamed elastomer)
in an outdoor, or buried application. To get the heat loss for pipes insulated with
alternate types of thermal insulation and for pipes installed indoors, multiply the
base heat loss of the pipe (Qb) from Step 3 by the insulation multiple from Table 4
and the indoor multiple from Table 3 to get the corrected heat loss:
Qcorrected = Qb x Insulation multiple x Indoor multiple
Example: Pipe Freeze Protection – Water Piping
Location

Aboveground, outdoor

Thermal insulation thickness and type 1-inch fiberglass
Pipe heat loss Qb

3.9 W/ft @ Tm 40°F (12.9 W/m @ Tm 4°C)

Qcorrected

3.9 W/ft x 1.00 x 1.00 = 3.9 W/ft @ Tm 40°F

(12.9 W/m @ Tm 4°C)
Example: Flow Maintenance – Greasy Waste Line
Location Buried
Thermal insulation type and thickness 1-inch rigid cellular urethane
Pipe heat loss Qb =

6.6 W/ft @ Tm 110°F (21.5 W/m @ Tm 43°C)

Qcorrected =

6.6 W/ft x 0.6 x 1.00 =

4.0 W/ft @ Tm 110°F

(13.1 W/m @ Tm 43°C)

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

THERMAL MANAGEMENT SOLUTIONS

Table 2 Pipe Heat Loss (Qb) for Outdoor or Buried Pipe (W/ft) for 1/2 to 3-1/2 inches

0.5

1.0

2.0

3.0

°C

1/2

3/4

1-1/4

1-1/2

2-1/2

1.0

1.2

1.4

1.6

1.8

2.2

2.5

3
3.0

3-1/2
3.4

2.5

2.9

3.5

4.1

4.6

5.5

6.5

7.7

8.6

100

5.2

6.1

7.2

8.6

9.6

11.5

13.5

16.0

18.0

150

8.1

9.5

11.2

13.4

14.9

17.9

21.1

25.0

28.1

0.6

0.7

0.8

1.0

1.1

1.3

1.5

1.7

1.9

1.6

1.9

2.2

2.5

2.8

3.2

3.8

4.4

4.9

100

3.4

3.9

4.5

5.2

5.8

6.8

7.8

9.1

10.2

150

5.3

6.1

7.0

8.2

9.0

10.6

12.2

14.2

15.9

0.5

0.6

0.7

0.8

1.0

1.1

1.3

1.4

1.3

1.5

1.7

1.9

2.1

2.4

2.8

3.2

3.6

100

2.8

3.1

3.5

4.0

4.4

5.1

5.8

6.7

7.4

150

4.3

4.8

5.5

6.3

6.9

8.0

9.1

10.5

11.6

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.3

1.4

1.6

1.8

2.0

2.3

2.6

2.9

100

2.4

2.7

3.0

3.4

3.7

4.2

4.8

5.5

6.0

150

3.7

4.2

4.7

5.3

5.8

6.6

7.5

8.5

9.4

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.2

1.3

1.4

1.6

1.8

2.0

2.3

2.5

100

2.2

2.4

2.7

3.0

3.3

3.7

4.2

4.7

5.2

150

3.4

3.7

4.2

4.7

5.1

5.8

6.5

7.4

8.1

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

1.6

1.8

2.0

2.2

100

2.0

2.2

2.4

2.7

2.9

3.3

3.7

4.2

4.6

150

3.1

3.4

3.8

4.3

4.6

5.2

5.8

6.6

7.1

0.3

0.4

0.5

0.6

0.7

0.9

1.0

1.1

1.2

1.4

1.5

1.7

1.8

100

1.8

2.0

2.1

2.4

2.5

2.9

3.2

3.5

3.8

150

2.8

3.0

3.4

3.7

4.0

4.4

4.9

5.5

6.0

Surface Snow
Melting – ElectroMelt

4.0

°F

Surface Snow
Melting – MI

2.5

Pipe diameter (IPS) in inches

Roof and Gutter
De-Icing

1.5

(ΔT)

Fire Sprinkler System
Freeze Protection

Insulation
thickness
(in)

Pipe Freeze Protection
and Flow Maintenance

Pipe Freeze Protection and Flow Maintenance Design

Note: Multiply the W/ft heat loss values by 3.28 for W/m.
Freezer Frost
Heave Prevention
Floor Heating

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection and flow Maintenance — XL-Trace System
Table 1.2 continued Pipe Heat Loss (Qb) for Outdoor or Buried Pipe (W/ft) for 4 to 20 inches
Insulation
thickness
(in)
0.5

1.0

1.5

2.0

2.5

3.0

4.0

(ΔT)

Pipe diameter (IPS) in inches

°F

°C

3.8

5.3

6.8

8.4

9.9

10.8

12.2

13.7

15.2

9.6

13.6

17.4

21.4

25.2

27.5

31.3

35.0

38.8

100

20.0

28.4

36.3

44.6

52.5

57.4

65.2

73.0

80.8

150

31.2

44.3

56.6

69.6

81.9

89.5

101.7

113.8

126.0

2.1

2.9

3.7

4.5

5.3

5.8

6.5

7.3

8.0

5.4

7.5

9.4

11.5

13.5

14.7

16.6

18.6

20.5

100

11.2

15.6

19.7

24.0

28.1

30.6

34.7

38.7

42.8

150

17.5

24.3

30.7

37.4

43.8

47.8

54.1

60.4

66.7

1.5

2.1

2.6

3.2

3.7

4.0

4.5

5.0

5.5

3.9

5.3

6.7

8.1

9.4

10.2

11.5

12.9

14.2

100

8.1

11.1

13.9

16.8

19.6

21.3

24.0

26.8

29.5

150

12.7

17.3

21.6

26.2

30.5

33.2

37.5

41.8

46.1

1.2

1.7

2.1

2.5

2.9

3.1

3.5

3.9

4.3

3.1

4.2

5.2

6.3

7.3

7.9

8.9

9.9

10.9

100

6.6

8.8

10.9

13.1

15.2

16.5

18.6

20.7

22.8

150

10.2

13.8

17.0

20.5

23.8

25.8

29.0

32.3

35.5

1.1

1.4

1.7

2.1

2.4

2.6

2.9

3.2

3.5

2.7

3.6

4.4

5.2

6.1

6.6

7.4

8.2

9.0

100

5.6

7.4

9.1

10.9

12.6

13.7

15.3

17.0

18.7

150

8.7

11.6

14.2

17.0

19.7

21.3

23.9

26.5

29.1

0.9

1.2

1.5

1.8

2.0

2.2

2.5

2.7

3.0

2.4

3.1

3.8

4.5

5.2

5.6

6.3

7.0

7.6

100

4.9

6.5

7.9

9.4

10.8

11.7

13.1

14.5

15.9

150

7.7

10.1

12.4

14.7

16.9

18.3

20.5

22.6

24.8

0.8

1.0

1.2

1.4

1.6

1.7

1.9

2.1

2.3

2.0

2.5

3.1

3.6

4.1

4.4

5.0

5.5

6.0

100

4.1

5.3

6.4

7.5

8.6

9.3

10.3

11.4

12.4

150

6.4

8.3

10.0

11.8

13.4

14.5

16.1

17.8

19.4

Note: Multiply the W/ft heat loss values by 3.28 for W/m.

Table 3 Indoor Pipe Heat Loss Multiples
Fiberglass thickness (in)

Indoor multiple

0.5

0.79

0.88

1.5

0.91

0.93

2.5

0.94

0.95

0.97

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

THERMAL MANAGEMENT SOLUTIONS

Table 4 Insulation Heat Loss Multiples
Insulation multiple

Examples of preformed pipe insulation

0.1–0.2

0.6

Rigid cellular urethane (ASTM C591)

0.2–0.3

1.0

Glass fiber (ASTM C547)
Foamed elastomer (ASTM C534)

0.3–0.4

1.4

Cellular glass (ASTM C552)
Mineral fiber blanket (ASTM C553)

Pipe Freeze Protection
and Flow Maintenance

Fire Sprinkler System
Freeze Protection

k factor at 50°F (10°C)
(BTU/hr–°F-ft2/in)

Step 2 Select the heating cable

2. Select the heating
cable
3. Determine the
heating cable length
4. Determine the
electrical parameters

Heating Cable Catalog Number

Before beginning, take a moment to understand the structure underlying heating
cable catalog numbers. You will refer to this numbering convention throughout the
product selection process. Your goal is to determine the catalog number for the
product that best suits your needs.
Catalog number: 5, 8 or 12 XL

6. Select the control
system
7. Select the power
distribution

Power output (W/ft)

8. Complete the Bill
of Materials

Product family
Voltage

1 or 2 -CR

Surface Snow
Melting – MI

5. Select the
connection kits
and accessories

To select the appropriate XL-Trace heating cable for your application, you must
determine your cable supply voltage, power output, and outer jacket. Once you select
these, you will be able to determine the catalog number for your cable.

Roof and Gutter
De-Icing

1. Determine design
conditions and
heat loss

Pipe Freeze Protection
and Flow Maintenance

Pipe Freeze Protection and Flow Maintenance Design

-CT

1 = 120 V (only available for 5 or 8)
2 = 208, 240, 277 V (available for 5, 8, or 12)

Fig. 11 Heating cable catalog number

Freezer Frost
Heave Prevention

Select the heating cable from Fig. 12 that provides the required power output to
match the corrected heat loss for your application. Fig. 12 shows the power output
for the heating cables on metal pipe at 120/208 volts. To correct the power output
for other applied voltage or plastic pipes multiply the power output at the desired
maintain temperature by the factors listed in Table 5. If the pipe heat loss, Qcorrected,
is between the two heating cable power output curves, select the higher-rated
heating cable.

Surface Snow
Melting – ElectroMelt

Jacket type: Polyolefin
or
Fluoropolymer (required for buried pipes, grease and fuel lines)

Floor Heating

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection and flow Maintenance — XL-Trace System
14



Power W/ft



8
6



4
2
0
30
(–1)

40
(5)

50
(10)

60
(15)

70
(21)

80
(27)

90
(32)

100
(38)

110
(43)

120
(49)

130 °F
(54) (°C)

Pipe temperature



5XL1-CR and 5XL1-CT (120 V)
5XL2-CR and 5XL2-CT (208 V)



8XL1-CR and 8XL1-CT (120 V)
8XL2-CR and 8XL2-CT (208 V)

 12XL2-CR and 12XL2-CT (208 V)

Fig. 12 Heating cable power output on metal pipe

Table 5 Power Output Correction Factors
Voltage correction factors

5XL1

8XL1

5XL2

8XL2

12XL2

120 V

1.00

–

208 V

–

1.00

240 V

–

1.12

1.14

277 V

–

1.29

1.27

1.30

0.75

Plastic pipe correction factor
(With AT-180 Aluminum tape)

Confirm that the corrected power output of the heating cable selected is greater
than the corrected pipe heat loss (Qcorrected). If Qcorrected is greater than the power
output of the highest-rated heating cable, you can:
• Use two or more heating cables run in parallel
• Use thicker insulation to reduce heat loss
• Use insulation material with a lower k factor to reduce heat loss
Example: Pipe Freeze Protection – Water Piping
Pipe maintain temperature (Tm) 40°F (4°C) (from Step 1)
Qcorrected Qcorrected = 3.9 W/ft @ Tm 40°F (13.1 W/m @ Tm 4°C)
Supply voltage

120 V (from Step 1)

Pipe material

Plastic (from Step 1)

Select heating cable:

Qb = 3.9 W/ft @ Tm 40°F (from Step 1)

5XL1= 5.6 W/ft @ 40°F (from Fig. 12)

Supply voltage correction factor 1.00 (from Table 5)
Pipe material correction factor Plastic = 0.75 (from Table 5)
Corrected heating cable power 5.6 W/ft x 1.00 x 0.75 = 4.2 W/ft
Selected heating cable

5XL1

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

THERMAL MANAGEMENT SOLUTIONS

Example: Flow Maintenance – Greasy Waste Line
Pipe maintain temperature (Tm) 110°F (43°C) (from Step 1)
3.9 W/ft @ Tm 110°F (13.1 W/m @ Tm 43°C)

Supply voltage

208 V (from Step 1)

Pipe material

Metal (from Step 1)

Select heating cable:

Qb = 3.9 W/ft @ Tm 110°F (from Step 1)

12XL2= 7.0 W/ft @110°F (from Fig. 12)

Fire Sprinkler System
Freeze Protection

Qcorrected

Supply voltage correction factor 1.00 (from Table 5)
Pipe material correction factor Metal = 1.00
Corrected heating cable power 7.0 x 1.00 x 1.00 = 7.0 W/ft
Selected heating cable

Pipe Freeze Protection
and Flow Maintenance

Pipe Freeze Protection and Flow Maintenance Design

12XL2

Refer to Table 6 to verify that the maximum system temperature does not exceed the
exposure temperature of the selected heating cable.

Roof and Gutter
De-Icing

Confirm exposure temperature rating for the heating cable

Table 6 Heating Cable Temperature Ratings
5XL2

8XL1

8XL2

150°F
(65°C)

12XL2

Maximum exposure temperature (Texp)

150°F
(65°C)

185°F
(85°C)

Surface Snow
Melting – MI

5XL1
Maximum maintain temperature (Tm)

Example: Pipe Freeze Protection – Water Piping
Maximum system temperature (Tmax )

80°F (27°C) (from Step 1)

Selected heating cable

5XL1 (from previous step)

Tmax < Texp

Surface Snow
Melting – ElectroMelt

Maximum heating cable exposure temperature (Texp) 150°F (65°C) (from Table 6)
Yes

Example: Flow Maintenance - Greasy Waste Line
Maximum system temperature (Tmax )

125°F (52°C) (from Step 1)

Selected heating cable

12XL2 (from previous step)

Maximum heating cable exposure temperature (Texp) 185°F (85°C)(from Table 6)
Tmax < Texp

Yes

Select the appropriate heating cable outer jacket for the application. Jacket options
are:
-CR Compatible with most XL-Trace applications
-CT

Required for buried pipe freeze protection and for grease and fuel line flow
maintenance; may be used in other XL-Trace applications for improved
mechanical strength and chemical resistance.

Floor Heating

Example: Pipe Freeze Protection – Water Piping
Selection: 5XL1-CR
Example: Flow Maintenance - Greasy Waste Line
Selection: 12XL2-CT

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Freezer Frost
Heave Prevention

Select Outer Jacket

Pipe Freeze Protection and flow Maintenance — XL-Trace System
Pipe Freeze Protection
and Flow Maintenance
1. Determine design
conditions and
heat loss
2. Select the heating
cable

Step 3 Determine the heating cable length
In Step 2 you selected the appropriate heating cable and the number of runs of
heating cable required for the pipe. Multiply the length of the pipe by the number of
heating cable runs for the heating cable length.

3. Determine the
heating cable length

Heating cable length = Pipe length x No. heating cable runs

4. Determine the
electrical parameters

Additional heating cable will be required for heat sinks and connection kits. Use
Table 7 and Table 8 to determine the additional footage required for heat sinks
(valves, flanges, and pipe supports). You will determine the additional heating cable
for connection kits in Step 5. Round up fractional lengths to ensure heating cable
lengths are sufficient.

5. Select the
connection kits
and accessories
6. Select the control
system
7. Select the power
distribution
8. Complete the Bill
of Materials

Total heating cable = (Pipe length x No. + Additional heating cable
length required
heating cable runs)
for heat sinks (valves, pipe
supports, and flanges)

Table 7 Additional Heating Cable for Valves
Pipe diameter (IPS) (inches)

Heating cable (feet (meters))

1/2

0.8

(0.24)

3/4

1.3

(0.4)

2.0

(0.6)

1-1/4

3.3

(1.1)

1-1/2

4.3

(1.3)

4.3

(1.3)

4.3

(1.3)

4.3

(1.3)

5.0

(1.5)

5.0

(1.5)

5.6

(1.7)

5.9

(1.9)

7.3

(2.2)

9.4

(2.9)

10.5

(3.2)

Table 8 Additional Heating Cable for Pipe Supports and Flanges
Support

Additional cable

Pipe hangers (insulated)

No additional heating cable

Pipe hangers noninsulated
and U-bolt supports

Add 2x pipe diameter

Welded support shoes

Add 3x the length of the shoe

Flanges

Add 2x pipe diameter

Note: For applications where more than one heating cable is required per foot of pipe,
this correction factor applies for each cable run.

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

THERMAL MANAGEMENT SOLUTIONS

Example: Pipe Freeze Protection – Water Piping
Pipe diameter

2-inch plastic (from Step 1)

Number of heating cable runs

1 (from Step 2)

Valves

3 gate valves

4.3 ft x 3 gate valves = 12.9 ft (3.9 m)

Pipe supports

5 pipe hangers with U-bolts

2-inch pipe diameter = 2 / 12 = 0.17 ft

[0.17 ft pipe diameter x 2] x 5 pipe supports

= 1.7 ft (0.5 m)

Flanges

Total heating cable for heat sinks 12.9 ft (3.9 m) + 1.7 ft (0.5 m) = 14.6 ft (4.4 m)

Rounded up to 15 ft (5 m)

Total heating cable length required 300 ft (91 m) x 1 run + 15 ft = 315 ft (96 m) of 5XL1-CR

(Note: AT-180 Aluminum tape is required for
installing heating cable on plastic pipe.)

Roof and Gutter
De-Icing

300 ft (91 m) (from Step 1)

Fire Sprinkler System
Freeze Protection

Pipe length

Pipe Freeze Protection
and Flow Maintenance

Pipe Freeze Protection and Flow Maintenance Design

Example: Flow Maintenance – Greasy Waste Line
Pipe diameter

4-inch metal (from Step 1)

Number of heating cable runs

1 (from Step 2)

Valves

2 gate valves

[4.3 ft x 2 gate valves] x 1 run = 8.6 ft (2.6 m)

Pipe supports

2 non-insulated hangers

4-inch pipe diameter = 4 /12 = 0.33 ft

[(0.33 ft pipe diameter x 2) x 2 pipe supports] x
1 run = 1.3 ft (0.4 m)

Flanges

4-inch pipe diameter = 4 /12 = 0.33 ft

[(2 x 0.33 ft (pipe diameter)) x 2 flanges] x 1 run

= 1.3 ft (0.4 m)

Surface Snow
Melting – ElectroMelt

200 ft (61 m) (from Step 1)

Surface Snow
Melting – MI

Pipe length

Total heating cable for heat sinks 8.6 ft (2.6 m) + 1.3 ft (0.4 m) + 1.3 ft (0.4 m)
= 11.2 ft (2.2 m)

Rounded up to 12 ft (3 m)

Freezer Frost
Heave Prevention

Total heating cable length required 200 ft x 1 run + 12 ft = 212 ft (65 m) of 12XL2-CT

Floor Heating

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection and flow Maintenance — XL-Trace System
Pipe Freeze Protection
and Flow Maintenance

Step 4 Determine the electrical parameters

1. Determine design
conditions and
heat loss

To determine the electrical requirements for your application, you must determine
the number of circuits and calculate the transformer load.

2. Select the heating
cable

Determine Number of Circuits

3. Determine the
heating cable length
4. Determine the
electrical parameters
5. Select the
connection kits
and accessories
6. Select the control
system
7. Select the power
distribution
8. Complete the Bill
of Materials

To determine the number of circuits, you need to know:
• Total heating cable length
• Supply voltage
• Minimum start-up temperature
Use Table 9 to determine the maximum circuit length allowed. If the total heating
cable length exceeds the maximum circuit length for the expected start-up
temperature, more than one circuit will be required.
Number of circuits = Heating cable length required
Maximum heating cable circuit
length

Important: Select the smallest appropriate ground-fault circuit breaker size.
WARNING: To minimize the danger of fire from sustained electrical arcing if
the heating cable is damaged or improperly installed, and to comply with the
requirements of Pentair Thermal Management, agency certifications, and
national electrical codes, ground-fault equipment protection must be used on
each heating cable branch circuit. Arcing may not be stopped by conventional
circuit protection.

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

THERMAL MANAGEMENT SOLUTIONS

Table 9 Maximum Circuit Length in Feet
40°F / 110°F Maintain*

–20°F

0°F

40°F

5XL2

120 V

120 V 208 V

101

134

101

201

270

15
20

8XL2

240 V

277 V

174

178

232

237

151

349

201

115
153

230

40
15

12XL2

208 V

240 V

277 V

208 V

240 V

277 V

183

131

138

146

111

114

117

245

175

184

194

148

151

156

356

367

262

276

291

223

227

234

465

474

478

349

368

388

297

303

312

199

203

209

149

157

166

120

122

126

115

265

271

279

199

209

221

160

163

168

172

398

406

419

298

314

331

239

244

252

270

210

470

490

530

370/399

390/420

420/443

319

326

336

134

100

232

237

244

173

182

192

126

129

133

178

133

309

315

325

231

243

257

169

172

177

270

200

464

473

488

346

365

385

253

258

266

270

210

470

490

530

370/462

390/486

420/513

340/349

344

355

160

119

278

283

292

206

217

229

142

145

150

214

159

370

378

390

275

290

306

190

194

200

270

210

470

490

530

370/416

390/438

420/462

285

291

300

270

210

470

490

530

370/554

390/584

420/616

340/398

360/406

380/419

–

228

240

254

152

155

160

–

304

320

338

203

207

213

–

457

481

507

304

310

320

–

609

641

676

405

414

427

–

272

286

302

169

172

178

–

362

381

402

225

230

237

–

543

572

603

338

345

356

–

610

660

720

430

460

490

* When maximum circuit length is listed in:
• black type, the value is for applications with a 40°F maintain
• red type, the value is for applications with a 110°F maintain

Surface Snow
Melting – ElectroMelt

65°F
(indoors grease)

8XL1

Surface Snow
Melting – MI

50°F
(buried)

5XL1

Roof and Gutter
De-Icing

20°F

CB
size
(A)

Fire Sprinkler System
Freeze Protection

Start-up
temperature
(°F)

Pipe Freeze Protection
and Flow Maintenance

Pipe Freeze Protection and Flow Maintenance Design

Freezer Frost
Heave Prevention
Floor Heating

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection and flow Maintenance — XL-Trace System
Table 10 Maximum Circuit Length in Meters
4°C / 43°C Maintain*
Start-up
temperature
(°C)

CB
size
(A)

–29°C

40
15

–18°C

–7°C

4°C

10°C
(buried grease)

5XL1

8XL1

5XL2

120 V

120 V 208 V

8XL2

12XL2

240 V

277 V

208 V

240 V

277 V

208 V

240 V

277 V

106

108

112

142

145

149

106

112

118

121

124

128

101

143

149

162

128/135

102

141

144

149

106

111

117

143

149

162

113/141

119/148

128/156

113

115

119

143

149

162

113/127

119/134

128/141

143

149

162

113/169

119/178

128/188

104/121

110/124

116/128

–

103

–

139

147

155

113/122

119/128

105

108

104/106
43

–

186

195

206

124

126

130

18°C
15
(indoors grease) 20

–

110

116

123

–

166

174

184

103

105

108

–

186

201

220

131

140

149

* When maximum circuit length is listed in:
• black type, the value is for applications with a 4°C maintain
• red type, the value is for applications with a 43°C maintain

Example: Pipe Freeze Protection – Water Piping
Total heating cable length

315 ft of 5XL1-CR (from Step 3)

Supply voltage

120 V (from Step 1)

Minimum start-up temperature

–20°F (–29°C) (from Step 1)

Number of circuits

315 ft / (201 ft max CL) = 1.6 circuits

Round up to 2 circuits

Example: Flow Maintenance – Greasy Waste Line

Total heating cable length

223 ft of 12XL2-CT (from Step 3)

Supply voltage

208 V (from Step 1)

Minimum start-up temperature

50°F (10°C) (from Step 1)

Number of circuits

223 ft / 304 ft = 0.7 circuits

Round up to 1 circuit

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

THERMAL MANAGEMENT SOLUTIONS

Determine Transformer Load

Transformers must be sized to handle the load of the heating cable. Use the
following tables to calculate the total transformer load.

Minimum start-up
temperature (°F)

5XL1

8XL1

120

5XL2
208

240

8XL2
277

208

12XL2

240

277

208

240

277

0.119

0.159

0.069

0.067

0.065

0.092

0.087

0.082

0.108

0.106

0.102

0.105

0.139

0.060

0.059

0.057

0.080

0.076

0.072

0.100

0.098

0.095

0.090

0.120

0.052

0.051

0.049

0.069

0.066

0.062

0.095

0.093

0.090

0.075

0.101

0.043

0.042

0.041

0.058

0.055

0.052

0.084

0.083

0.080

–

0.053

0.050

0.047

0.079

0.077

0.075

–

0.044

0.042

0.040

0.072

0.070

0.067

Table 12 Transformer Sizing (Amperes/meter)
Minimum start-up
temperature (°C)
–20

5XL1

8XL1

120

208

5XL2
240

277

208

8XL2
240

277

208

240

277

0.391

0.521

0.226

0.221

0.215

0.301

0.286

0.270

0.354

0.347

0.336

12XL2

0.343

0.457

0.198

0.194

0.188

0.264

0.251

0.238

0.329

0.322

0.312

–7

0.294

0.394

0.170

0.166

0.161

0.227

0.216

0.205

0.311

0.305

0.296

0.246

0.331

0.142

0.139

0.135

0.191

0.181

0.172

0.276

0.271

0.263

–

0.172

0.164

0.155

0.259

0.254

0.246

–

0.145

0.138

0.130

0.233

0.228

0.221

Max A/ft at minimum start-up temperature x Heating cable length (ft)
x Supply voltage
1000

Surface Snow
Melting – ElectroMelt

Use Table 11 or Table 12 to determine the applied voltage and the maximum A/ft
(A/m) at the minimum start up temperature to calculate the transformer load as
follows:

Surface Snow
Melting – MI

–18

Roof and Gutter
De-Icing

–20

Fire Sprinkler System
Freeze Protection

Table 11 Transformer Sizing (Amperes/foot)

Pipe Freeze Protection
and Flow Maintenance

Pipe Freeze Protection and Flow Maintenance Design

= Transformer
load (kW)

Example: Pipe Freeze Protection – Water Piping
315 ft of 5XL1-CR (from Step 3)

Minimum start-up temperature

–20°F (–29°C) (from Step 1)

Circuit breaker sizing

30 A

Max A/ft at –20°F x Total feet
x Supply voltage

Transformer load (kW)

= 4.5 kW

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

= (0.119 A/ft x 315 ft x 120 V) / 1000
Floor Heating

1000

Freezer Frost
Heave Prevention

Total heating cable length

Pipe Freeze Protection and flow Maintenance — XL-Trace System
Example: Flow Maintenance – Greasy Waste Line
Total heating cable length

212 ft of 12XL2-CT (from Step 3)

Supply voltage

208 V

Minimum start-up temperature

50°F (10°C) (from Step 1)

Max A/ft at 50°F x Total feet
x Supply voltage

= (0.079 A/ft x 212 ft x 208 V) / 1000

1000
Transformer load (kW)
Pipe Freeze Protection
and Flow Maintenance
1. Determine design
conditions and
heat loss
2. Select the heating
cable
3. Determine the
heating cable length
4. Determine the
electrical parameters
5. Select the
connection kits
and accessories
6. Select the control
system

= 3.5 kW

Step 5 Select the connection kits and accessories
All XL-Trace systems require a power connection and end seal kit. Splice and tee kits
are used as required. Use Table 13 on page 29 (for aboveground applications) and
Table 15 on page 31 (for buried applications) to select the appropriate connection kits.
Note: Add extra cable on your Bill of Materials for power connections, tees, and
end seals. See Table 13 on page 29, Table 15 on page 31, and Table 16 on
page 32 for more information.
WARNING: Approvals and performance are based on the use of Pentair
Thermal Management-specified parts only. Do not substitute parts or use vinyl
electrical tape.
Aboveground Piping

7. Select the power
distribution
8. Complete the Bill
of Materials

Alternate
lighted end seal

RayClic-PC
powered connection

RayClic-LE
lighted end seal

RayClic-S
splice
RayClic-E
end seal

RayClic-PT
powered
tee

RayClic-PS
powered
splice

RayClic-X
cross tee

XL-Trace
heating cable

RayClic-T
tee

Alternate
connection kits

Fig. 13 RayClic connection system

Use the following table for general piping, and greasy waste and fuel lines. Develop a
bill of materials from the connection kits listed in this table.
Note: Connection kits must be off the pipe when installed on greasy waste, fuel
oil, or pipes exceeding 150°F (65°C).

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

THERMAL MANAGEMENT SOLUTIONS

Table 13 Connection Kits and Accessories for Aboveground Piping

Description

Standard
packaging

Usage

Heating
cable
allowance1

Fire Sprinkler System
Freeze Protection

Catalog
number
Connection kits

Power connection and end seal (RayClicSB-04 pipe mounting bracket included)

1 per circuit

2 ft (0.6 m)

RayClic-PS

Powered splice and end seal (RayClicSB-04 pipe mounting bracket included)

1 per circuit

4 ft (1.2 m)

RayClic-PT

Powered tee and end seal (RayClic-SB-04
pipe mounting bracket included)

1 per circuit

6 ft (1.8 m)

FTC-P2

Power connection and end seal kit

1 per circuit

2 ft (0.6 m)

Roof and Gutter
De-Icing

RayClic-PC

Pipe Freeze Protection
and Flow Maintenance

Pipe Freeze Protection and Flow Maintenance Design

Note: FTC-P is required for circuits requiring 40 A circuit breakers.

As required

2 ft (0.6 m)

RayClic-T

Tee kit with end seal;
use as needed for pipe
branches

As required

2 ft (0.6 m)

RayClic-X

Cross connection to connect four heating
cables

As required

8 ft (2.4 m)

FTC-HST3

Low-profile splice/tee; use as
needed for pipe branches

As required

3 ft (0.9 m)

RayClic-LE

Lighted end seal (RayClic-SB-04 pipe
mounting bracket included)

Alternate end seal 2 ft (0.6 m)

RayClic-E

Replacement end seal

Freezer Frost
Heave Prevention

Surface Snow
Melting – ElectroMelt

Splice used to join two
sections of heating cable

Surface Snow
Melting – MI

RayClic-S

Additional end seal 0.3 ft (0.1 m)

Floor Heating

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection and flow Maintenance — XL-Trace System
Table 13 Connection Kits and Accessories for Aboveground Piping
Catalog
number

Standard
packaging

Description

Heating
cable
allowance1

Usage

Accessories
Pipe mounting bracket. Required
for mounting the kits off the pipe
for exposure temperatures greater
than 150°F (65°C) and for grease
and fuel line splices and tees.

As required

RayClic-SB-02

Wall mounting bracket

As required

ETL

“Electric Traced” label (use 1 label
per 10 feet of pipe)

1 label per 10 feet
(3 m) of pipe

GT-66

Glass cloth adhesive tape for
attaching heating cable to pipe at
40°F (4°C) or above.

66 ft (20 m)

See Table 14

GS-54

Glass cloth adhesive tape for
attaching heating cable to pipe
above –40°F (–40°C).

54 ft (20 m)

See Table 14

AT-180

Aluminum tape. Required for
attaching heating cable to plastic
pipe (use 1 foot of tape per foot of
heating cable).

180 ft
(55 m)

1 ft/ft [0.3 m/m] of
heating cable

0 AIR nag
TH
H5 ER em
76 MA ent
57
L.C LL
C
07 OM
/13

–

ec
tr
ic

W
AR

tT N
ra IN
ci G
ng

SH
m O
C
ele ain K
re ct tain A
m ri e ND
ovi ca d
ng l lo a FIR
th ck cco E
erm o rd H
u
al t ing AZA
in pro to R
D
su ce
la d m :
tio ure a Sys
n. s nu te
be fact m
fo ure m
re r' u
st
w s
ork in b
e
in stru in
g ct st
on io a
n ll
©
th s. ed
20
is F a
13
Pe
nta
lin oll nd
PN WW
ir
Th
C7
e ow
72 W. erm
03 PE al
or
-00 NT Ma

RayClic-SB-04

–

1 Allow extra heating cable for ease of component installation.
2 Junction box not included.
3 One RayClic-E end seal is required for each FTC-HST used as a tee kit.

Table 14 Quantity of Glass Cloth Adhesive Tape Required (attach at 1-foot intervals)
Pipe size (in)

Feet of pipe per GT-66 roll

60 (18 m)

50 (15 m)

40 (12 m)

25 (8 m)

20 (6 m)

15 (5 m)

Feet of pipe per GS-54 roll

49 (15 m)

41 (13 m)

33 (10 m)

20 (6 m)

16 (5 m)

12 (4 m)

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

THERMAL MANAGEMENT SOLUTIONS

Buried Piping

Pipe Freeze Protection
and Flow Maintenance

Pipe Freeze Protection and Flow Maintenance Design

DigiTrace C910-485
Electronic controller

Fire Sprinkler System
Freeze Protection

Alternate
end seal

Wall

RayClic-LE*

FTC-XC
power
connection
Conduit

with wall
mounting
bracket

Conduit for
temperature
sensor

Ground

RTD10CS

Roof and Gutter
De-Icing

Junction box
Insulation RayClic-E
end seal

RayClic-PC* Ground

Conduit

with wall
mounting
bracket

XL-Trace
heating cable
with -CT jacket
*To protect the heating cable, run cable
inside Convolex tubing between the
conduit and the RayClic connection kits.

Surface Snow
Melting – MI

Alternate
power connection

Wall

Fig. 14 Typical buried piping system

Use the following for buried water piping and greasy waste lines. Note that all
connections must be aboveground and that no splices/tees are allowed. Develop a
bill of materials from the connection kits in this table.

Catalog
number

Description

Standard
packaging

Usage

Heating cable
allowance1

Power connection and end seal
(RayClic-SB-04 pipe mounting bracket
included)

1 per circuit

2 ft (0.6 m)

FTC-XC

The FTC-XC power connection and end 1
seal kit is for use with XL-Trace heating
cable that is run through conduit to a
junction box. Materials for one power
connection and end seal is included in
the kit.

1 per circuit

2 ft (0.6 m)

Alternate end
seal

2 ft (0.6 m)

Additional end
seal

0.3 ft (0.1 m)

Freezer Frost
Heave Prevention

RayClic-PC

Surface Snow
Melting – ElectroMelt

Table 15 Connection Kits and Accessories for Buried Piping

Note: FTC-XC is required for circuits

requiring 40 A circuit breakers.

RayClic-E

Replacement end seal

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Lighted end seal (RayClic-SB-04 pipe
mounting bracket included)

Floor Heating

RayClic-LE

Pipe Freeze Protection and flow Maintenance — XL-Trace System
Table 15 Connection Kits and Accessories for Buried Piping
Catalog
number

Standard
packaging

Description

Heating cable
allowance1

Usage

Accessories
1

As required

–

RayClic-SB-02 Wall mounting bracket

As required

–

ETL

“Electric Traced” label (use 1
label per 10 feet of pipe)

1 label per 10 feet
(3 m) of pipe

–

GT-66

Glass cloth adhesive tape for
attaching heating cable to pipe at
40°F (4°C) or above.

66 ft (20 m)

See Table 16

–

GS-54

Glass cloth adhesive tape for
attaching heating cable to pipe
above –40°F (–40°C).

54 ft (20 m)

See Table 16

–

AT-180

Aluminum tape. Required for
attaching heating cable to plastic
pipe (use 1 foot of tape per foot of
heating cable).

180 ft (55 m)

1 ft/ft [0.3 m/m] of
heating cable

–

0 AIR nag
TH
H5 ER em
76 MA ent
57
L.C LL
C
07 OM
/13

ec
tr
ic

W
AR

tT N
ra IN
ci G
ng

RayClic-SB-04 Pipe mounting bracket

1 Allow extra heating cable for ease of component installation.

Table 16 Quantity of Glass Cloth Adhesive Tape Required (attach at 1-foot intervals)
<2

Feet of pipe per GT-66 roll

Pipe size (in)

60 (18 m)

50 (15 m)

40 (12 m)

25 (8 m)

20 (6 m)

15 (5 m)

Feet of pipe per GS-54 roll

49 (15 m)

41 (13 m)

33 (10 m)

20 (6 m)

16 (5 m)

12 (4 m)

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze
Freeze Protection
Protection
Pipe
and Flow
Flow Maintenance
Maintenance
and

Step  Select the control system
Temperature controls save energy by ensuring that the system is energized only
when necessary. Pentair Thermal Management offers a wide variety of monitoring
and control options, including:

2. Select the heating
cable

• Electronic thermostats provide higher accuracy of the heating cable circuit with
thermistor sensors and built-in ground-fault protection.

3. Determine the
heating cable length
4. Determine the
electrical parameters
5. Select the
connection kits
and accessories

7. Select the power
distribution
8. Complete the Bill
of Materials

• Modbus® protocol communication over RS-485 system is supported using
DigiTrace ProtoNode multi-protocol gateways.
Note: Greasy waste flow maintenance requires line sensing controllers such as
the DigiTrace ECW-GF, DigiTrace C910-485, or the DigiTrace ACS-30.
Use the following table to identify the control system suitable for your application.
Contact your Pentair Thermal Management representative or contact Pentair
Thermal Management directly at (800) 545-6258 for more information.

Roof and Gutter
De-Icing

6. Select the control
system

• Electronic controllers provide superior accuracy with RTD temperature sensors,
built-in ground-fault protection, monitoring and alarm output.

Fire Sprinkler System
Freeze Protection

1. Determine design
conditions and
heat loss

Pipe Freeze Protection
and Flow Maintenance

Pipe Freeze Protection and Flow Maintenance Design

Table 17 Temperature Control Options
Electronic controllers

Single-point

Multipoint

ECW-GF

C910-485

ACS-30

Ambient sensing

Line sensing

Buried pipe

Application

Sensor

32°F to 200°F
(0°C to 93°C)

–76°F to 1058°F
(–60°C to 570°C)

Enclosure

NEMA 4X

Deadband

2°F to 10°F
(2°C to 6°C)

3°F (1.6°C)

–40°F to 140°F
(–40°C to 60°C)

Switch rating

30 A

Switch type

DPST

100–277 V

c-UL-us

c-CSA-us

20 mA to 250 mA

Enclosure limits

Electrical rating
Approvals
Ground-fault
protection

35 ft

30 mA fixed

Alarm outputs

Freezer Frost
Heave Prevention

RTD*
multiple options

Set point range

Thermistor

Surface Snow
Melting – ElectroMelt

RTD*
multiple options

Sensor length

Surface Snow
Melting – MI

Electronic
thermostat

"
2 A at 277 Vac

100–277 V, 0.75 A
max.

Dry contact relay

2 A at 48 Vdc

48 Vac/dc, 500 mA
max.

"
Floor Heating

AC relay

* not included with unit

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection and flow Maintenance — XL-Trace System
Table 18 Control Systems
Catalog number

Description

Electronic Thermostats and Accessories
ECW-GF

The ECW-GF electronic controller provides accurate temperature control with integrated 30-mA ground-fault protection. The controller can be programmed to maintain
temperatures up to 200°F (93°C) at voltages from 100 to 277 V and can switch current
up to 30 Amperes. The ECW-GF is complete with a 25-ft (7.6-m) temperature sensor
for line, slab or ambient sensing temperature control, and is housed in a NEMA 4X
rated enclosure. The controller features an AC/DC dry alarm contact relay.

ECW-GF-DP

An optional remote display panel (ECW-GF-DP) can be added to provide ground-fault
or alarm indication in applications where the controller is mounted in inaccessible
locations.

FTC-PSK

The FTC-PSK pipe stand and power connection kit is for use with XL-Trace heating cables. The stand is designed specifically for the DigiTrace ECW-GF electronic
controllers and is compatible with other junction boxes that have 1 inch NPT entries,
threaded or non-threaded. Materials for one power connection and end seal are
included in the kit.

Electronic Controllers and Sensors

A0
A1
A2
A3
A4
A5
A6
A7

C910-485

The C910-485 is a compact, full-featured microprocessor-based single-point heattrace controller. The C910-485 provides control and monitoring of electrical heat-tracing circuits for both freeze protection and temperature maintenance, and can be set to
monitor and alarm for high and low temperature, high and low current, ground-fault
level, and voltage. The DigiTrace C910-485 controller is available with an electromechanical relay (EMR) for use in ordinary areas. The C910-485 comes with an RS-485
communication module.

ACS-UIT2
ACS-PCM2-5

The DigiTrace ACS-30 Advanced Commercial Control System is a multipoint electronic control and monitoring system for heat-tracing used in commercial freeze protection and flow maintenance applications. The DigiTrace ACS-30 system can control up
to 260 circuits with multiple networked ACS-PCM2-5 panels, with a single ACS-UIT2
user interface terminal. The ACS-PCM2-5 panel can directly control up to 5 individual
heat-tracing circuits using electromechanical relays rated at 30 A up to 277 V.

ProtoNode-LER
ProtoNode-RER

The DigiTrace ProtoNode is an external, high performance multi-protocol gateway
for customers needing protocol translation between Building Management Systems
(BMS) and the DigiTrace ACS-30 or C910-485 controllers.

PROTOCESSOR
SERIAL ETHERNET

PROTONODE

B0
B1
B2
B3
S0
S1
S2
S3

By FieldServer Technologies
www.ProtoCessor.com

RS 485 GND
RS 485 RS 485+

The ProtoNode-LER is for LonWorks® systems; and the ProtoNode-RER is for
BACnet® or Metasys® N2 systems.

+PWR
- PWR
FRAME GND

RTD-200
RTD3CS
RTD10CS
RTD50CS

Three-wire RTD (Resistance Temperature Device) used with DigiTrace C910-485 and
ACS-30 controllers.
RTD-200: 6-ft (1.8 m) fluoropolymer with 1/2-in NPT bushing
RTD3CS: 3-ft (0.9 m) flexible armor with 1/2-in NPT bushing
RTD10CS: 10-ft (3 m) flexible armor with 1/2-in NPT bushing
RTD50CS: 50-ft (3 m) flexible armor with 1/2-in NPT bushing

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze
Freeze Protection
Protection
Pipe
and Flow
Flow Maintenance
Maintenance
and

Step  Select the power distribution

2. Select the heating
cable

Once the heating cable circuits have been defined, you must select how to provide
power to them. Power to the XL-Trace heating cables can be provided in several
ways: directly through the temperature control, through external contactors, or
through HTPG power distribution panels.

3. Determine the
heating cable length

Single circuit control

4. Determine the
electrical parameters

Heating cable circuits that do not exceed the current rating of the selected
temperature control device shown in Table 18 can be switched directly (see Fig. 15).

5. Select the
connection kits
and accessories

Group control

7. Select the power
distribution

Single circuit control

Group control

Surface Snow
Melting – MI

Large systems with many circuits should use an HTPG power distribution panel.
The HTPG is a dedicated power-distribution, control, ground-fault protection,
monitoring, and alarm panel for freeze protection and broad temperature
maintenance heat-tracing applications. This enclosure contains an assembled
circuit-breaker panelboard. Panels are equipped with ground-fault circuit breakers
with or without alarm contacts. The group control package allows the system to
operate automatically in conjunction with an ambient-sensing thermostat, individual
electronic, or duty cycle controller.

8. Complete the Bill
of Materials

Roof and Gutter
De-Icing

If the current draw exceeds the switch rating, or if the controller will activate more
than one circuit (group control, an external contactor must be used (see Fig. 15 on
page 35).

6. Select the control
system

Fire Sprinkler System
Freeze Protection

1. Determine design
conditions and
heat loss

Pipe Freeze Protection
and Flow Maintenance

Pipe Freeze Protection and Flow Maintenance Design

Temperature
controller

Heating
cable

1-pole
GFEP breaker

ø supply
N

ø
ø
ø

Heating cable
sheath, braid
or ground

3-phase 4-wire
supply (WYE)

Contactor

Surface Snow
Melting – ElectroMelt

Temperature
controller

1 ø supply
N

3-pole main
breaker

Freezer Frost
Heave Prevention

N
G (Typ 3)
Heating cable
sheath, braid
or ground

Fig. 15 Single circuit and group control
Floor Heating

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection and flow Maintenance — XL-Trace System
Alarm horn (optional)
Door
disconnect
(optional)

Main circuit
breaker

Push button for
light testing

R AR

Alarm relay
(optional)
COMMON ALARM
PUSH TO ACKNOWLEDGE

Selector switch

TB 1

Distribution
panelboard

Main
contactor

Fuse holder

POWER ON
C

Terminals
(optional)

HAND/OFF/AUTO

Ground
bus bar

TB 2

Alarm option shown above

Fig. 16 HTPG power distribution panel

Three-phase, 4 wire supply (Wye)

Ø1 Ø2Ø3 N G
Three-pole main
circuit breaker
Three-pole main
contactor

Hand

Off

Contactor
coil

Auto

External controller/
thermostat*

Panel
energized

One-pole with 30-mA
ground-fault trip
(120/277 Vac)

Alarm
remote
annunciation
(with alarm
option)

Power
connection
Heating cable
End seal
Heating
cable
circuit
Heating cable shealth, braid or ground

Two-pole with 30-mA
ground-fault trip
(208/240 Vac)

Heating
cable
circuit

Fig. 17 HTPG power schematic

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

THERMAL MANAGEMENT SOLUTIONS

Table 19 Power Distribution
Catalog number

Description

Pipe Freeze Protection
and Flow Maintenance

Pipe Freeze Protection and Flow Maintenance Design

Power Distribution
Heat-tracing power distribution panel with ground-fault and monitoring for group
control.

E104

Three-pole, 100 Amp per pole, 600 V maximum contactor housed in UL Listed, CSA
Certified, NEMA 4X enclosure with two 1-inch conduit entries. When ordering, select
coil voltage (110–120, 208–240, 277 V).

Fire Sprinkler System
Freeze Protection

HTPG

COMMON ALARM
PUSH TO ACKNOWLEDGE
A

POWER ON
C

HAND/OFF/AUTO

Contactors

E304

Enclosure dimensions: 9-1/2 in x 7-1/5 in x 6-11/16 in (241 mm x 183 mm x 170 mm).

Pipe Freeze
Freeze Protection
Protection
Pipe
and Flow
Flow Maintenance
Maintenance
and

Surface Snow
Melting – MI

Three-pole, 40 Amp per pole, 600 V maximum contactor housed in UL Listed, CSA
Certified NEMA 4X enclosure with two 1-inch conduit entries. When ordering, select coil
voltage
(110–120, 208–240, 277 V).

Roof and Gutter
De-Icing

Enclosure dimensions: 13-1/2 in x 9-1/5 in x 6-11/16 in (343 mm x 234 mm x 170 mm).

Step 8 Complete the Bill of Materials
If you used the Design Worksheet to document all your design parameters, you
should have all the details necessary complete your Bill of Materials.
Surface Snow
Melting – ElectroMelt

1. Determine design
conditions and
heat loss
2. Select the heating
cable
3. Determine the
heating cable length
4. Determine the
electrical parameters
5. Select the
connection kits
and accessories

Freezer Frost
Heave Prevention

6. Select the control
system
7. Select the power
distribution
8. Complete the Bill
of Materials

Floor Heating

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection and flow Maintenance — XL-Trace System
XL-Trace System Pipe Freeze Protection and Flow Maintenance Design Worksheet
Step  Determine design conditions and pipe heat loss
Design conditions
XL-Trace
application

Max.
Min.
Maintain system ambient
temp.
temp. temp. Pipe diameter
(Tm)
(Tmax ) (Ta )
and material

Location

Pipe
length

Thermal insulation
type and thickness

Pipe freeze protection
❑ Water piping

❑ Indoors ❑ Aboveground
❑ Outdoors ❑ Buried
______

______ ______

❑ Metal
❑ Fiberglass
____ in ❑ Plastic ____ ft (m) ❑ ________

___ in

Flow maintenance
❑ Greasy waste
lines

❑ Indoors ❑ Aboveground
❑ Outdoors ❑ Buried
______

______ ______

❑ Metal
❑ Fiberglass
____ in ❑ Plastic ____ ft (m) ❑ ________

___ in

❑ Fuel lines

❑ Indoors ❑ Aboveground
❑ Outdoors ❑ Buried
______

______ ______

❑ Metal
❑ Fiberglass
____ in ❑ Plastic ____ ft (m) ❑ ________

___ in

Example:
0 Water piping

0 Aboveground
0 Outdoor

40°F

80°F

–20°F

2 in

0 Plastic

300 ft

0 Fiberglass

1 in

Pipe heat loss
Calculate temperature differential ΔT
Pipe maintain temperature (TM)

°F (°C)

Ambient temperature (TA)
°F (°C)
=

−
TA

∆T

Example: Pipe Freeze Protection − Water Piping
40 °F

Pipe maintain temperature (TM)

(from Step 1)

°F
−20 °F

Ambient temperature (TA)

(from Step 1)

°F
40 °F
TM

−

−20 °F

60 °F

∆T

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

THERMAL MANAGEMENT SOLUTIONS

Determine the pipe heat loss: See Table 2 for the base heat loss of the pipe (Qb). If the ΔT for your system is not listed, interpolate between
the two closest values.

Fire Sprinkler System
Freeze Protection

QB-50 ∆T1
W/ft (W/m)
QB-100 ∆T2
W/ft (W/m)
QB
W/ft (W/m)
Pipe diameter
in
Insulation thickness

Roof and Gutter
De-Icing

∆T

Pipe Freeze Protection
and Flow Maintenance

XL-Trace System Pipe Freeze Protection and Flow Maintenance Design Worksheet

°F (°C)

QB-50
W/ft (W/m)
QB-50
W/ft (W/m)
Example: Pipe Freeze Protection − Water Piping
2 in

Insulation thickness

1 in

∆T

Surface Snow
Melting – MI

Pipe diameter

60°F

QB-50

3.2 W/ft

QB-100

6.8 W/ft
∆T 60°F is 20% of the distance between ∆T 50°F and ∆T 100°F
QB-50 + [0.20 x (QB-100 − QB-50)]

QB-60

3.2 + [0.20 x (6.8 − 3.2)] = 3.9 W/ft

Surface Snow
Melting – ElectroMelt

∆T interpolation

Pipe heat loss (QB-60) 3.9 W/ft @ TM 40°F

Freezer Frost
Heave Prevention
Floor Heating

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection and flow Maintenance — XL-Trace System
Compensate for insulation type and pipe location
See Table 2 for the pipe heat loss (Qb). If the ΔT for your system is not listed, interpolate between the two closest values.
See Table 3 for indoor multiple
See Table 4 for insulation multiple
Location
Insulation thickness and type
QB
W/ft (W/m)
Insulation multiple
Indoor multiple (if applicable)
x

Insulation multiple

Indoor multiple
(if applicable)

QCORRECTED

Example: Pipe Freeze Protection − Water Piping
Location

Aboveground, indoor

Thermal insulation thickness and type 1-in fiberglass
QB

3.9 W/ft @ TM 40°F

Insulation multiple

1.00

Indoor multiple

N/A

QCORRECTED =

3.9 W/ft
QB

1.00
Insulation multiple

3.9 W/ft @ TM 40°F

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

THERMAL MANAGEMENT SOLUTIONS

Step  Select the heating cable
Power output data: See Fig. 12
Power output correction factors: See Table 5
Heating cable temperature ratings: See Table 6
(from Step 1)

Corrected heat loss (QCORRECTED)

(from Step 1)

Supply voltage

(from Step 1)

Pipe material (metal or plastic)

(from Step 1)

XL-Trace application (water, fuel oil, or greasy waste)

(from Step 1)

Fire Sprinkler System
Freeze Protection

Pipe maintain temperature (TM)

Roof and Gutter
De-Icing

Pipe freeze protection: general water piping, sprinkler piping
Flow maintenance: greasy waste lines, fuel lines
Maximum system use temperature (TMAX)

(from Step 1)

Heating cable selected

(from Step 1)

Pipe Freeze Protection
and Flow Maintenance

XL-Trace System Pipe Freeze Protection and Flow Maintenance Design Worksheet

Power at TM (120/208 V)
Power output correction factor

(from Step 1)
Surface Snow
Melting – MI

Plastic pipe correction factor

Power at rated V factor

=
Plastic pipe correction factor

Corrected power

Is the heating cable power output (PCORRECTED) ≥ the corrected heat loss? E Yes E No
If No, then design with additional runs of heating cable or thicker thermal insulation.
Example: Pipe Freeze Protection − Water Piping
Surface Snow
Melting – ElectroMelt

40°F

Maintain temperature (TM)

3.9 W/ft @ TM 40°F

Corrected heat loss (QCORRECTED)
Supply voltage

120 V

Pipe material (metal or plastic*)

plastic

(*AT-180 aluminum tape required for
installing heating cable on plastic pipes)

Freezer Frost
Heave Prevention

QB = 3.9 W/ft @ TM 40°F
Select curve C: 5XL1 = 5.6 W/ft @ 40°F
Power output correction factor: 120 V = 1.00
Pipe material correction factor: Plastic = 0.75
Corrected heating cable power: 5.6 @/ft x 1.00 x 0.75 = 4.2 W/ft
Select: 5XL1
Maximum system temperature (TMAX): 80°F
Maximum heating cable exposure temperature (TEXP): 150°F
TMAX < TEXP: Yes

Floor Heating

Select outer jacket
❑ -CR
❑ -CT
Example: Pipe Freeze Protection – Water Piping
5XL1-CR

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

11/13

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection and flow Maintenance — XL-Trace System
Step  Determine the heating cable length
For additional heating cable allowance for valves: See Table 7.
For additional heating cable allowance for pipe supports and flanges: See Table 8.

Heat sinks
Type of valves

How many

Type of pipe supports

How many

Type of flanges

How many

=
Additional heating cable

Total heating cable
for valves
=

Additional heating cable

Total heating cable
for pipe supports

*2-in pipe diameter = 0.17 ft

=
Additional heating cable

Total heating cable
for flanges

Total heating cable for heat sinks:

Total heating cable length

(

Pipe length

)

Number of heating
cable runs

Total heating cable
length required

Additional cable for valves,
pipe supports, and flanges

Example:

Heat sinks
Gate valves

Type of valves

How many

Pipe hangers noninsulated
and U-bolt supports

Type of pipe supports

How many

n/a

Type of flanges

How many

4.3 ft

Additional heating cable

Total

(0.17 ft* x 2 = 0.34 ft)

1.7 ft

Additional heating cable

Total

*2-in pipe diameter = 0.17 ft

12.9 ft

0 ft

Additional heating cable

Total

Total: 14.6 ft rounded up to 15 ft

Total heating cable length

(

300 ft
Pipe length

)

Number of heating
cable runs

15 ft

Additional cable for valves,
pipe supports, and flanges

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

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315 ft
Total heating cable
length required

THERMAL MANAGEMENT SOLUTIONS

Step  Determine the electrical parameters
Determine maximum circuit length and number of circuits
See Table 9 and Table 10.

Supply voltage:

T 120 V
T 240 V

T 208 V
T 277 V

Circuit breaker size:

T 15 A
T 30 A

T 20 A
T 40 A

Fire Sprinkler System
Freeze Protection

Total heating cable length required

Minimum start-up temperature

Maximum heating cable circuit length

Roof and Gutter
De-Icing

Maximum circuit length
Total heating cable length required

Pipe Freeze Protection
and Flow Maintenance

XL-Trace System Pipe Freeze Protection and Flow Maintenance Design Worksheet

Number of circuits

Example:

Total heating cable length required 315 ft of 5XL1-CR

9120 V
T
T 240 V

T 208 V
T 277 V

Circuit breaker size:

T 15 A
930 A
T

T 20 A
T 40 A

Minimum start-up temperature

−20°F

Maximum circuit length

201 ft

315 ft

201 ft
Maximum heating cable circuit length

1.6 circuits, round up to 2
Number of circuits

Surface Snow
Melting – ElectroMelt

Total heating cable length required

Surface Snow
Melting – MI

Supply voltage:

Determine transformer load
See Table 11 and Table 12.
Max A/ft at minimum start-up temperature

Heating cable length

Supply voltage

/ 1000

Transformer
load (kW)

0.119 A/ft
Max A/ft at minimum start-up temperature

315 ft
Heating cable length

120 V
Supply voltage

Freezer Frost
Heave Prevention

Example:
4.5 kW
Transformer
load (kW)

Floor Heating

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection and flow Maintenance — XL-Trace System
Step  Select the connection kits and accessories
See Table 13.

Connection kits – Aboveground

Description

Quantity

Heating cable
allowance

❑ RayClic-PC

Power connection and end seal

____________

__________________

❑ RayClic-PS

Power splice and end seal

____________

__________________

❑ RayClic-PT

Powered tee and end seal

____________

__________________

❑ FTC-P

Power connection and end seal

____________

__________________

❑ RayClic-S

Splice

____________

__________________

❑ RayClic-T

Tee kit with end seal

____________

__________________

❑ RayClic-X

Cross connection

____________

__________________

❑ FTC-HST

Low-profile splice/tee

____________

__________________

❑ FTC-PSK

Pipe stand and power connection kit

____________

__________________

❑ RayClic-LE

Lighted end seal

____________

__________________

❑ RayClic-E

Extra end seal

____________

__________________

Connection kits – Buried

Description

Quantity

Heating cable
allowance

❑ RayClic-PC

Power connection and end seal

____________

__________________

❑ FTC-XC

Power splice and end seal

____________

__________________

❑ RayClic-LE

Lighted end seal

____________

__________________

❑ RayClic-E

Extra end seal

____________

__________________

Accessories – Aboveground
and buried

Description

Quantity

❑ RayClic-SB-04

Pipe mounting bracket

_____________

❑ RayClic-SB-02

Wall mounting bracket

_____________

❑ ETL

“Electric-Traced” label

_____________

❑ GT-66

Glass cloth adhesive tape

_____________

❑ GS-54

Glass cloth adhesive tape

_____________

❑ AT-180

Aluminum tape (for plastic pipes)

_____________
Total heating cable
allowance for connection kits

Total heating cable length

Total heating cable allowance for connection kits

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

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Total heating cable
length required

THERMAL MANAGEMENT SOLUTIONS

Step  Select the control system
See Table 18.

Quantity

❑ ECW-GF

Electronic thermostat with 25-ft sensor

_____________

❑ ECW-GF-DP

Remote display panel for ECW-GF

_____________

❑ C910-485

Microprocessor-based single-point heat-tracing controller

_____________

❑ ACS-UIT2

ACS-30 user interface terminal

_____________

❑ ACS-PCM2-5

ACS-30 power control panel

_____________

❑ ProtoNode-LER

Multi-protocol gateway

_____________

❑ ProtoNode-RER

Multi-protocol gateway

_____________

❑ RTD3CS

Resistance temperature device

_____________

❑ RTD10CS

Resistance temperature device

_____________

❑ RTD-200

Resistance temperature device

_____________

❑ RTD50CS

Resistance temperature device

_____________

Roof and Gutter
De-Icing

Description

Fire Sprinkler System
Freeze Protection

Thermostats, controllers
and accessories

Pipe Freeze Protection
and Flow Maintenance

XL-Trace System Pipe Freeze Protection and Flow Maintenance Design Worksheet

Step  Select the power distribution
See Table 19.

Description

❑ HTPG

Heat-tracing power distribution panel for group control _____________

Contactors

Description

Quantity

Surface Snow
Melting – MI

Power distribution

Quantity

❑ E104

Three-pole, 100 Amp per pole contactor

_____________

❑ E304

Three-pole, 40 Amp per pole contactor

_____________

Surface Snow
Melting – ElectroMelt

Step  Complete the Bill of Materials
Use the information recorded in this worksheet to complete the Bill of Materials.

Freezer Frost
Heave Prevention
Floor Heating

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection and flow Maintenance — XL-Trace System

EN-RaychemXLTracePipeFreezeProtection-DG-H55838

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THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection
and Flow Maintenance
Floor Heating

This guide does not cover applications in which any of the following conditions exist:

Freezer Frost
Heave Prevention

This design guide presents Pentair Thermal Management’s recommendations for
designing an XL-Trace pipe freeze protection system for fire sprinkler piping. It
provides design and performance data, control options, electrical sizing information,
and application configuration suggestions. This guide does not give information on
how to design your fire protection system.

Surface Snow
Melting – ElectroMelt

Introduction

Surface Snow
Melting – MI

Contents
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
How to Use this Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Safety Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
System Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Approvals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Self-Regulating Heating Cable Construction. . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Fire Suppression System Freeze Protection Applications. . . . . . . . . . . . . . . . . . . . . 51
Typical Pipe Freeze Protection System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Fire Supply Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Sprinkler Standpipes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Branch Lines with Sprinklers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Freezer Application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Fire Suppression System Freeze Protection Design. . . . . . . . . . . . . . . . . . . . . . . . . . 57
Design Step by Step. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Step 1 Determine design conditions and pipe heat loss. . . . . . . . . . . . . . . 58
Step 2 Select the heating cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Step 3 Determine the heating cable length . . . . . . . . . . . . . . . . . . . . . . . . . 65
Step 4 Determine the electrical parameters . . . . . . . . . . . . . . . . . . . . . . . . 67
Step 5 Select the connection kits and accessories . . . . . . . . . . . . . . . . . . . 70
Step 6 Select the control system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Step 7 Complete the Bill of Materials. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Installation and Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
XL-Trace System Fire Sprinkler System Freeze Protection Design Worksheet. . . . 78

Roof and Gutter
De-Icing

This step-by-step design guide provides the tools necessary to design a Raychem
XL-Trace fire sprinkler freeze protection system. For other applications or for design
assistance, contact your Pentair Thermal Management representative or phone
Pentair Thermal Management at (800) 545‑6258. Also, visit our web site at
www.pentairthermal.com.

Fire Sprinkler System
Freeze Protection

Fire Sprinkler System Freeze
Protection — XL-Trace System

• Hazardous locations, as defined in national electrical codes
• Supply voltage other than 120 V or 208–277 V

THERMAL MANAGEMENT SOLUTIONS

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Technical Data
Sheets

If your application conditions are different, or if you have any questions, contact your
Pentair Thermal Management representative or contact Pentair Thermal
Management directly at (800) 545‑6258.

Fire Sprinkler System Freeze Protection — XL-Trace System
How to Use this Guide
This design guide takes you step by step through designing a freeze protection
system for fire suppression piping. Following these recommendations will result in a
reliable, energy-efficient system.
Other Required Documents

This guide is not intended to provide comprehensive installation instructions. For
complete system installation instructions, please refer to the following additional
required documents:
• XL-Trace System Installation and Operation Manual (H58033)
• Additional installation instructions are included with the connection kits,
controllers, and accessories
If you do not have the above documents, you can obtain them from the Pentair
Thermal Management web site at www.pentairthermal.com.
For products and applications not covered by this design guide, please contact your
Pentair Thermal Management representative or call Pentair Thermal Management
directly at (800) 545-6258.
Safety Guidelines
As with any electrical equipment, the safety and reliability of any system depends
on the quality of the products selected and the manner in which they are installed
and maintained. Incorrect design, handling, installation, or maintenance of any of
the system connection kits could damage the system and may result in inadequate
performance, overheating, electric shock, or fire. To minimize these risks and to
ensure that the system performs reliably, read and carefully follow the information,
warnings, and instructions in this guide.
This symbol identifies important instructions or information.

This symbol identifies particularly important safety warnings that must be
followed.
WARNING: To minimize the danger of fire from sustained electrical arcing
if the heating cable is damaged or improperly installed, and to comply with the
requirements of Pentair Thermal Management, agency certifications, and national
electrical codes, ground-fault equipment protection must be used on each heating
cable branch circuit. Arcing may not be stopped by conventional circuit protection.

Warranty
Pentair Thermal Management’s standard limited warranty applies to all products.
An extension of the limited warranty period to ten (10) years from the date of
installation is available if a properly completed online warranty form is submitted
within thirty (30) days from the date of installation. You can access the complete
warranty on our web site at www.pentairthermal.com.

EN-RaychemXLTraceFireSprinkler-DG-H58489

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THERMAL MANAGEMENT SOLUTIONS

System Overview
The XL-Trace system is designed to freeze protect aboveground and buried supply
pipes, fire standpipes, branch lines and branch lines containing sprinklers when run
in areas subject to freezing.

Approvals

XL-Trace systems are also UL and ULC Listed for freeze-protecting sprinkler
supply lines, standpipes up to 20 inches in diameter and branch lines not containing
sprinklers.

Surface Snow
Melting – MI

The 2007 edition of NFPA 13 (Standard for the Installation of Sprinkler Systems)
allows Listed electrical heat tracing to freeze protect fire suppression systems
including supply lines, standpipes and branch lines containing sprinklers. XL-Trace
is c-CSA-us Certified for use on fire suppression systems under CSA C22.2 No. 13003 for Canada and IEEE 515.1-2005 for the US. The system covered in this manual
includes supply lines, stand pipes, branch lines and sprinkler heads.

Roof and Gutter
De-Icing

An XL-Trace system includes the heating cable, power connection, splice, tee
connections, controls, power distribution panels, accessories, and the tools
necessary for a complete installation.

Fire Sprinkler System
Freeze Protection

Pentair Thermal Management offers the option of three self-regulating heating
cables with the XL-Trace system; 5XL, 8XL, and 12XL for applications using 120 V and
208–277 V power supplies. The XL-Trace system is based on self-regulating heating
cable technology whereby the heating cable’s output is reduced automatically as the
pipe warms; eliminating the possibility of sprinkler system overheating.

Pipe Freeze Protection
and Flow Maintenance

System Overview

Surface Snow
Melting – ElectroMelt
Freezer Frost
Heave Prevention
Floor Heating

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Fire Sprinkler System Freeze Protection — XL-Trace System
Self-Regulating Heating Cable Construction
Raychem XL-Trace self-regulating heating cables are comprised of two parallel
nickel-plated bus wires in a cross-linked polymer core, a tinned copper braid, and a
fluoropolymer or polyolefin outer jacket. These cables are cut to length, simplifying
the application design and installation.

Polyolefin or
fluoropolymer outer jacket
Tinned-copper braid
Modified polyolefin inner jacket
Self-regulating conductive core
Nickel-plated copper bus wire

Fig. 1 XL-Trace heating cable construction

re
g

Power

Constant wattage

lf-

At moderate temperature,
there are fewer conducting
paths because the heating
cable efficiently adjusts by
decreasing output, eliminating
any possibility of overheating.

Resistance

At low temperature,
there are many
conducting paths,
resulting in high output
and rapid heat-up. Heat
is generated only when it
is needed and precisely
where it is needed.

Constant wattage

lf-

re
g

ing

Temperature

Fig. 2 Self-regulating heating cable technology

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THERMAL MANAGEMENT SOLUTIONS

Fire Suppression System Freeze Protection Applications
A freeze protection system is designed to maintain water temperature at a minimum
of 40°F (4°C) to prevent fire suppression piping from freezing.

Pipe Freeze Protection
and Flow Maintenance

Fire Suppression System Freeze Protection Applications

Fire Sprinkler System
Freeze Protection

Typical Pipe Freeze Protection System
A typical freeze protection system includes the XL-Trace self-regulating heating
cables, connection kits, temperature control, and power distribution.

Roof and Gutter
De-Icing

Line sensing RTD

Ambient sensing RTD

Surface Snow
Melting – MI

RayClic-LE
lighted end seal
XL-Trace
Thermal insulation

DigiTrace C910-485
electronic
controller

RayClic-S splice

Surface Snow
Melting – ElectroMelt

Standpipe

RayClic-PC
power connection
Control valves
in heated enclosure

Fire
alarm
panel

Power
distribution
panel

Freezer Frost
Heave Prevention

Ground

Floor Heating

Fig. 3 Typical XL-Trace pipe freeze protection system

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Fire Sprinkler System Freeze Protection — XL-Trace System
Fire Supply Lines
XL-Trace is designed to maintain fire supply lines at 40°F (4°C) in areas subject to
freezing.
Aboveground SUPPLY piping
Junction
box

DigiTrace C910-485
Electronic controller

RayClic-PC
power connection

RayClic-S
splice

RayClic-LE
lighted end seal
(optional)

Insulation

XL-Trace
heating cable

RayClic-T
tee

RayClic-E
end seal

Fig. 4 Typical aboveground supply piping system

Application Requirements
The system complies with Pentair Thermal Management requirements for
aboveground general water piping when:
• The heating cable is permanently secured to insulated metal pipes with GT-66
glass tape or to plastic pipes using AT-180 aluminum tape.
• DigiTrace C910-485 or ACS-30 controllers with integrated ground-fault protection
and alarm contacts are used and are connected to a fire control panel.
• The heating cable is installed per manufacturer’s instructions with approved
Raychem connection kits. See Table 11 on page 71 and the XL-Trace System
Installation and Operation Manual (H58033).
Approvals
UL Listed and c-CSA-us Certified for nonhazardous locations.
-w
5XL1-CR, -CT
5XL2-CR, -CT

8XL1-CR, -CT
8XL2-CR, -CT

5XL1-CR, -CT
5XL2-CR, -CT

EN-RaychemXLTraceFireSprinkler-DG-H58489

8XL1-CR, -CT 12XL2-CR, -CT
8XL2-CR, -CT

11/13

THERMAL MANAGEMENT SOLUTIONS

Buried piping

Pipe Freeze Protection
and Flow Maintenance

Fire Suppression System Freeze Protection Applications

DigiTrace C910-485
Electronic controller

Fire Sprinkler System
Freeze Protection

Alternate
end seal

Wall

RayClic-LE*

FTC-XC
power
connection
Conduit

with wall
mounting
bracket

Conduit for
temperature
sensor

Ground

Temperature sensor

Roof and Gutter
De-Icing

Junction box
Insulation RayClic-E
end seal

RayClic-PC* Ground

Conduit

with wall
mounting
bracket

XL-Trace
heating cable
with -CT jacket
*To protect the heating cable, run cable
inside Convolex tubing between the
conduit and the RayClic connection kits.

Surface Snow
Melting – MI

Alternate
power connection

Wall

Fig. 5 Typical buried piping system

Application Requirements

• The heating cable is permanently secured to insulated metal pipes with GT-66
glass tape or to plastic pipes using AT-180 aluminum tape.
• The pipeline is buried at least 2-feet deep.
• The heating cable has a fluorpolymer outer jacket (-CT).
• All heating cable connections (power, splice, tee, and end termination) are made
aboveground. No buried or in-conduit splices or tees are allowed.

• The heating cable is protected from the pipe to the power connection box in UL
Listed and CSA Certified water-sealed conduit (minimum 3/4-inch diameter) suitable for the location.
• DigiTrace C910-485 or ACS-30 controllers with integrated ground-fault protection
and alarm contacts are used and are connected to a fire control panel.

Freezer Frost
Heave Prevention

• The power connection and end seal are made in UL Listed and CSA Certified
junction boxes, or RayClic connection kits, above grade.

Surface Snow
Melting – ElectroMelt

The system complies with Pentair Thermal Management requirements for use on
buried insulated metal or plastic pipe when:

• Closed-cell, waterproof thermal insulation with fire-retardant, waterproof covering approved for direct burial is used.
Floor Heating

• The heating cable is installed per manufacturer’s instructions with approved
Pentair Thermal Management connection kits. See Table 13 on page 73 and the
XL-Trace System Installation and Operation Manual (H58033).
Approvals
UL Listed and c-CSA-us Certified for nonhazardous locations.
-w

THERMAL MANAGEMENT SOLUTIONS

8XL1-CT
8XL2-CT

5XL1-CT
5XL2-CT

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8XL1-CT
8XL2-CT

11/13

12XL2-CT

Technical Data
Sheets

5XL1-CT
5XL2-CT

Fire Sprinkler System Freeze Protection — XL-Trace System
Sprinkler Standpipes
XL-Trace is designed to maintain fire suppression system standpipes at 40°F (4°C) in
areas subject to freezing.
For aboveground standpipes

Line sensing RTD

Ambient sensing RTD
RayClic-LE
lighted end seal
Thermal insulation

XL-Trace

RayClic-S splice

DigiTrace C910-485
electronic
controller

Standpipe
RayClic-PC
power connection
Control valves
in heated enclosure

Refer to Branch
Lines with
Sprinkler section
for information on
heat tracing
sprinkler heads.

Power
distribution
panel

Fire
alarm
panel

Ground

Fig. 6 Standard sprinkler standpipe heating system layout

Application Requirements
The system complies with Pentair Thermal Management requirements for freeze
protection of sprinkler system piping when:
• The heating cable is permanently secured to insulated metal pipes with GT-66
glass tape or to plastic pipes using AT-180 aluminum tape.
• Schedule 5, 10, 20, or 40 steel sprinkler standpipe up to and including 20 inches
in diameter is used.
• UL Listed fiberglass or closed cell flame-retardant insulation with weatherproof
cladding is used.
• DigiTrace C910-485 or ACS-30 controllers with integrated ground-fault protection
and alarm contacts are used and are connected to a fire control panel.
• The heating cable is installed per manufacturer’s instructions with approved
Pentair Thermal Management connection kits. See Table 11 on page 71 and the
XL-Trace System Installation and Operation Manual (H58033).
Approvals
UL Listed and c-CSA-us Certified for nonhazardous locations.
-w
5XL1-CR, -CT
5XL2-CR, -CT

8XL1-CR, -CT
8XL2-CR, -CT

5XL1-CR, -CT
5XL2-CR, -CT

EN-RaychemXLTraceFireSprinkler-DG-H58489

8XL1-CR, -CT 12XL2-CR, -CT
8XL2-CR, -CT

11/13

THERMAL MANAGEMENT SOLUTIONS

Branch Lines with Sprinklers
XL-Trace is designed to maintain branch lines containing sprinklers at 40°F (4°C) in
areas subject to freezing.

Pipe Freeze Protection
and Flow Maintenance

Fire Suppression System Freeze Protection Applications

Fire Sprinkler System
Freeze Protection

End seal
Tee

Cross

Roof and Gutter
De-Icing

Sprinkler
Insulation

Line sensing
RTD

Splice
RayClic-LE
lighted end seal
(optional)

Power
connection

Surface Snow
Melting – MI

Junction
box

Surface Snow
Melting – ElectroMelt

Ambient
sensing
RTD

DigiTrace
C910-485

Fig. 7 Typical fire suppression system for branch lines with sprinklers

The system complies with Pentair Thermal Management requirements for fire
suppression branch lines with sprinklers when:
• The heating cable is permanently secured to metal pipes with GT-66 glass tape,
or to plastic pipes using AT-180 aluminum tape.
• DigiTrace C910-485 or ACS-30 controllers with integrated ground-fault protection
with alarm contacts are used and are connected to a fire control panel.

Freezer Frost
Heave Prevention

Application Requirements

• The sprinkler design accounts for the sprinkler shadow created by the outer diameter of the thermal pipe insulation.

Floor Heating

• Closed-cell, waterproof thermal insulation with fire-retardant, waterproof covering is used.

• Additional heating cable is installed to compensate for sprinkler heads, sprigs,
valves and pipe supports as detailed in the Table 6 on page 66 of this document
and the XL‑Trace System Installation and Operation Manual (H58033).

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Fire Sprinkler System Freeze Protection — XL-Trace System
Approvals
c-CSA-us Certified for use in U.S. and Canada in nonhazardous locations.
-w
5XL1-CR, -CT
5XL2-CR, -CT

Freezer Application

8XL1-CR, -CT
8XL2-CR, -CT

XL-Trace is designed to keep condensate in dry sprinklers from freezing and may be
installed in freezers located in areas subject to freezing.
Thermal insulation

RTD
Building

XL-Trace
DigiTrace
C910-485
electronic
controller

Freezer

Fire
alarm
panel

Power
distribution
panel

Fig. 8 Typical fire suppression system for freezer applications

Application Requirements
The system complies with Pentair Thermal Management requirements for fire
suppression systems for freezer applications when:
• The system is for freezer and freezer within a freezer applications.
• The heating cable is permanently secured to metal pipes with GT-66 glass tape,
or to plastic pipes using AT-180 aluminum tape.
• DigiTrace C910-485 or ACS-30 controllers with integrated ground-fault protection
and alarm contacts are used and are connected to a fire control panel.
• Closed-cell, waterproof thermal insulation with fire-retardant, waterproof covering is used for pipes and sprigs in areas subject to freezing.
• The sprinkler design accounts for sprinkler shadow created by the outer diameter
of the thermal pipe insulation.
• The heating cable is installed per manufacturer’s instructions with approved
Pentair Thermal Management connection kits. See Table 13 on page 73 and the
XL-Trace System Installation and Operation Manual (H58033).
• Additional heating cable is installed to compensate for sprinkler heads, sprigs,
valves and pipe supports as detailed in the Table 6 on page 66 of this document
and the XL‑Trace System Installation and Operation Manual (H58033).
Approvals
c-CSA-us Certified for use in U.S. and Canada in nonhazardous locations.
-w
5XL1-CR, -CT
5XL2-CR, -CT

8XL1-CR, -CT
8XL2-CR, -CT

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11/13

THERMAL MANAGEMENT SOLUTIONS

Fire Suppression System Freeze Protection Design

XL-Erate, the commercial pipe freeze protection and flow maintenance design
software, is available at http://www.pentairthermal.com to assist with your design.

Fire Sprinkler System
Freeze Protection

This section details the design steps necessary to design your application. The
examples provided in each step are intended to incrementally illustrate the project
parameter output for two sample designs from start to finish. As you go through
each step, use the “XL-Trace System Fire Sprinkler System Freeze Protection Design
Worksheet,” page 78, to document your project parameters, so that by the end of
this section you will have the information you need for your Bill of Materials.

Pipe Freeze Protection
and Flow Maintenance

Fire Suppression System Freeze Protection Design

Design Step by Step
Roof and Gutter
De-Icing

Your system design requires the following essential steps.

Surface Snow
Melting – MI

 Select the control system
 Complete the Bill of Materials

Surface Snow
Melting – ElectroMelt
Freezer Frost
Heave Prevention
Floor Heating

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Fire Sprinkler System Freeze Protection — XL-Trace System
Pipe Freeze Protection
and Flow Maintenance
1. Determine design
conditions and
pipe heat loss
2. Select the heating
cable
3. Determine the
heating cable length
4. Determine the
electrical parameters
5. Select the
connection kits
and accessories
6. Select the control
system
7. Complete the Bill
of Materials

Step 1 Determine design conditions and pipe heat loss
Collect the following information to determine your design conditions:
• Location
–– Indoors
–– Outdoors
–– Aboveground
–– Buried
• Maintain temperature (Tm)
• Minimum ambient temperature (Ta )
• Pipe diameter and material
• Pipe length
• Thermal insulation type and thickness
• Supply voltage
Example: Fire Standpipe
Location

Aboveground, outdoors

Maintain temperature (Tm)

40°F (4°C)

Minimum ambient temperature (Ta )

–20°F (–29°C)

Pipe diameter and material

10-inch metal

Pipe length

50 ft (16.4 m)

Thermal insulation type and thickness

1 1/2-inch fiberglass

Supply voltage

208 V

Branch Line with Sprinkler
Location Indoors

Maintain temperature (Tm)

40°F (4°C)

Minimum ambient temperature (Ta )

0°F (–18°C)

Pipe diameter and material

1-inch metal

Pipe length

200 ft (61 m)

Thermal insulation type and thickness

1/2-inch closed-cell foamed elastomer

Supply voltage

208 V

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THERMAL MANAGEMENT SOLUTIONS

Pipe Heat Loss Calculations

Thermal insulation thickness

Pipe or
tubing
diameter

Minimum
ambient
temperature

°F

Roof and Gutter
De-Icing

80
60
40
20

°F

Fire Sprinkler System
Freeze Protection

+40
+20
0
−20
−40

Pipe Freeze Protection
and Flow Maintenance

Fire Suppression System Freeze Protection Design

Maintain
temperature

Fig. 9 Pipe heat loss

Calculate temperature differential ΔT
To calculate the temperature differential ΔT), use the formula below:
Surface Snow
Melting – MI

ΔT = Tm – Ta
Example: Fire Standpipe
Tm

40°F (4°C)

–20°F (–29°C)

ΔT = 40°F – (–20°F) = 60°F

ΔT = 4°C – (–29°C) = 33°C
Surface Snow
Melting – ElectroMelt

Example: Branch Line with Sprinkler
Tm

40°F (4°C)

0°F (-18°C)

ΔT = 40°F – (0°F) = 40°F

ΔT = 4°C – (–18°C) = 22°C

Freezer Frost
Heave Prevention

Determine the pipe heat loss
Match the pipe size, insulation thickness, and temperature differential (ΔT) from
Table 1 on page 61 to determine the base heat loss of the pipe (Qb).
Example: Fire Standpipe
Pipe diameter

10 inch

Insulation thickness 1 1/2 inch
ΔT

60°F (33°C)

Qb-50

8.1 W/ft (from Table 1)

Qb-100

16.8 W/ft (from Table 1)

ΔT interpolation

ΔT 60°F is 20% of the distance between ΔT 50°F and ΔT 100°F

Qb-60

Qb-50 + [0.20 x (Qb-100 – Qb-50)] = 8.1 + [0.20 x (16.8 – 8.1)] = 9.8 W/ft

THERMAL MANAGEMENT SOLUTIONS

EN-RaychemXLTraceFireSprinkler-DG-H58489

11/13

Technical Data
Sheets

Pipe heat loss (Qb) 9.8 W/ft @ Tm 40°F (32.1 W/m @ Tm 4°C)

Floor Heating

Heat loss (Qb) for 60°F must be calculated through interpolation between ΔT at 50°F
and ΔT at 100°F from Table 1. For difference between the ΔT of 50°F and theΔT of
100°F:

Fire Sprinkler System Freeze Protection — XL-Trace System
Example: Branch Line with Sprinkler
Pipe diameter

1 inch

Insulation thickness 1/2 inch
ΔT

40°F (22°C)

Qb for 40°F must be calculated through interpolation between ΔT at 20°F and ΔT at
50°F from Table 1. For difference between the ΔT of 20°F and the ΔT of 50°F:
Qb-20

1.4 W/ft (from Table 1)

Qb-50

3.5 W/ft (from Table 1)

ΔT interpolation

ΔT 40°F is 67% of the distance between ΔT 20°F and ΔT 50°F

Qb-40

Qb-50 + [0.67 x (Qb-50 – Qb-20)] = 1.4 + [0.67 x (3.5 – 1.4)] = 2.8 W/ft

Pipe heat loss Qb

2.8 W/ft @ Tm 40°F (9.2 W/m @ Tm 4°C)

Compensate for insulation type and pipe location
The base heat loss is calculated for a pipe insulated with thermal insulation with a
k-factor ranging from 0.2 to 0.3 BTU/hr–°F–ft2/in (fiberglass or foamed elastomer)
in an outdoor, or buried application. To get the heat loss for pipes insulated with
alternate types of thermal insulation and for pipes installed indoors, multiply the
base heat loss of the pipe (Qb) from Step 3 by the insulation multiple from Table 3 on
page 62 and the indoor multiple from Table 2 on page 62 to get the corrected
heat loss:
Qcorrected = Qb x Insulation multiple x Indoor multiple
Example: Fire Standpipe
Location

Aboveground, outdoors

Thermal insulation thickness and type 1 1/2-inch fiberglass
Pipe heat loss Qb

9.8 W/ft @ Tm 40°F (32.1 W/m @ Tm 4°C)

Qcorrected
9.8 W/ft x 1.00 x 1.00 = 9.8 W/ft @ Tm 40°F

(32.1 W/m @ Tm 4°C)
Example: Branch Line with Sprinkler
Location

Aboveground, indoors

Thermal insulation type and thickness 1/2-inch closed cell foamed elastomer
Pipe heat loss Qb =

2.8 W/ft @ Tm 40°F (9.2 W/m @ Tm 4°C)

Qcorrected =
2.8 W/ft x 1.0 x 0.79 = 2.20 W/ft @ Tm 410°F

(7.3W/m @ Tm 4°C)

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THERMAL MANAGEMENT SOLUTIONS

Table 1 Pipe Heat Loss (Qb) for Outdoor or Buried Pipe (W/ft) for 1/2 to 3-1/2 inches

0.5

1.0

2.0

3.0

°C

1/2

3/4

1-1/4

1-1/2

2-1/2

3-1/2

1.0

1.2

1.4

1.6

1.8

2.2

2.5

3.0

3.4

2.5

2.9

3.5

4.1

4.6

5.5

6.5

7.7

8.6

100

5.2

6.1

7.2

8.6

9.6

11.5

13.5

16.0

18.0

150

8.1

9.5

11.2

13.4

14.9

17.9

21.1

25.0

28.1

0.6

0.7

0.8

1.0

1.1

1.3

1.5

1.7

1.9

1.6

1.9

2.2

2.5

2.8

3.2

3.8

4.4

4.9

100

3.4

3.9

4.5

5.2

5.8

6.8

7.8

9.1

10.2

150

5.3

6.1

7.0

8.2

9.0

10.6

12.2

14.2

15.9

0.5

0.6

0.7

0.8

1.0

1.1

1.3

1.4

1.3

1.5

1.7

1.9

2.1

2.4

2.8

3.2

3.6

100

2.8

3.1

3.5

4.0

4.4

5.1

5.8

6.7

7.4

150

4.3

4.8

5.5

6.3

6.9

8.0

9.1

10.5

11.6

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.3

1.4

1.6

1.8

2.0

2.3

2.6

2.9

100

2.4

2.7

3.0

3.4

3.7

4.2

4.8

5.5

6.0

150

3.7

4.2

4.7

5.3

5.8

6.6

7.5

8.5

9.4

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.2

1.3

1.4

1.6

1.8

2.0

2.3

2.5

100

2.2

2.4

2.7

3.0

3.3

3.7

4.2

4.7

5.2

150

3.4

3.7

4.2

4.7

5.1

5.8

6.5

7.4

8.1

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

1.6

1.8

2.0

2.2

100

2.0

2.2

2.4

2.7

2.9

3.3

3.7

4.2

4.6

150

3.1

3.4

3.8

4.3

4.6

5.2

5.8

6.6

7.1

0.3

0.4

0.5

0.6

0.7

0.9

1.0

1.1

1.2

1.4

1.5

1.7

1.8

100

1.8

2.0

2.1

2.4

2.5

2.9

3.2

3.5

3.8

150

2.8

3.0

3.4

3.7

4.0

4.4

4.9

5.5

6.0

Surface Snow
Melting – ElectroMelt

4.0

°F

Surface Snow
Melting – MI

2.5

Pipe diameter (IPS) in inches

Roof and Gutter
De-Icing

1.5

(ΔT)

Fire Sprinkler System
Freeze Protection

Insulation
thickness
(in)

Pipe Freeze Protection
and Flow Maintenance

Fire Suppression System Freeze Protection Design

Note: Multiply the W/ft heat loss values by 3.28 for W/m.
Freezer Frost
Heave Prevention
Floor Heating

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Fire Sprinkler System Freeze Protection — XL-Trace System
Table 1 continued Pipe Heat Loss (Qb) for Outdoor or Buried Pipe (W/ft) for 4 to 20 inches
Insulation
thickness
(in)
0.5

1.0

1.5

2.0

2.5

3.0

4.0

(ΔT)

Pipe diameter (IPS) in inches

°F

°C

3.8

5.3

6.8

8.4

9.9

10.8

12.2

13.7

15.2

9.6

13.6

17.4

21.4

25.2

27.5

31.3

35.0

38.8

100

20.0

28.4

36.3

44.6

52.5

57.4

65.2

73.0

80.8

150

31.2

44.3

56.6

69.6

81.9

89.5

101.7

113.8

126.0

2.1

2.9

3.7

4.5

5.3

5.8

6.5

7.3

8.0

5.4

7.5

9.4

11.5

13.5

14.7

16.6

18.6

20.5

100

11.2

15.6

19.7

24.0

28.1

30.6

34.7

38.7

42.8

150

17.5

24.3

30.7

37.4

43.8

47.8

54.1

60.4

66.7

1.5

2.1

2.6

3.2

3.7

4.0

4.5

5.0

5.5

3.9

5.3

6.7

8.1

9.4

10.2

11.5

12.9

14.2

100

8.1

11.1

13.9

16.8

19.6

21.3

24.0

26.8

29.5

150

12.7

17.3

21.6

26.2

30.5

33.2

37.5

41.8

46.1

1.2

1.7

2.1

2.5

2.9

3.1

3.5

3.9

4.3

3.1

4.2

5.2

6.3

7.3

7.9

8.9

9.9

10.9

100

6.6

8.8

10.9

13.1

15.2

16.5

18.6

20.7

22.8

150

10.2

13.8

17.0

20.5

23.8

25.8

29.0

32.3

35.5

1.1

1.4

1.7

2.1

2.4

2.6

2.9

3.2

3.5

2.7

3.6

4.4

5.2

6.1

6.6

7.4

8.2

9.0

100

5.6

7.4

9.1

10.9

12.6

13.7

15.3

17.0

18.7

150

8.7

11.6

14.2

17.0

19.7

21.3

23.9

26.5

29.1

0.9

1.2

1.5

1.8

2.0

2.2

2.5

2.7

3.0

2.4

3.1

3.8

4.5

5.2

5.6

6.3

7.0

7.6

100

4.9

6.5

7.9

9.4

10.8

11.7

13.1

14.5

15.9

150

7.7

10.1

12.4

14.7

16.9

18.3

20.5

22.6

24.8

0.8

1.0

1.2

1.4

1.6

1.7

1.9

2.1

2.3

2.0

2.5

3.1

3.6

4.1

4.4

5.0

5.5

6.0

100

4.1

5.3

6.4

7.5

8.6

9.3

10.3

11.4

12.4

150

6.4

8.3

10.0

11.8

13.4

14.5

16.1

17.8

19.4

Note: Multiply the W/ft heat loss values by 3.28 for W/m.
Table 2 Indoor Pipe Heat Loss Multiples
Fiberglass thickness (in)

Indoor multiple

0.5

0.79

0.88

1.5

0.91

0.93

2.5

0.94

0.95

0.97

Table 3 Insulation Heat Loss Multiples
k factor at 50°F (10°C) (BTU/hr–°F–ft2/in)

Insulation multiple

Examples of preformed pipe insulation

0.1–0.2

0.6

Rigid cellular urethane (ASTM C591)

0.2–0.3

Glass fiber (ASTM C547)
Foamed elastomer (ASTM C534)

0.3–0.4

1.4

Cellular glass (ASTM C552)
Mineral fiber blanket (ASTM C553)

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THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection
and Flow Maintenance

Step 2 Select the heating cable
To select the appropriate XL-Trace heating cable for your application, you must
determine your cable supply voltage, power output, and outer jacket. Once you have
selected these, you will be able to determine the catalog number for your cable.

2. Select the heating
cable

Heating Cable Catalog Number

3. Determine the
heating cable length

Before beginning, take a moment to understand the structure of the heating cable
catalog numbers. You will refer to this numbering convention throughout the product
selection process. Your goal is to determine the catalog number for the product that
best suits your needs.

4. Determine the
electrical parameters
5. Select the
connection kits
and accessories

1 or 2 -CR

-CT

Roof and Gutter
De-Icing

Catalog number: 5, 8 or 12 XL

6. Select the control
system

Power output (W/ft)

7. Complete the Bill
of Materials

Product family
Voltage

1 = 120 V (only available for 5 or 8)
2 = 208, 240, 277 V (available for 5, 8, or 12)

Surface Snow
Melting – MI

Jacket type: Polyolefin
or
Fluoropolymer (required for buried pipes)
Fig. 10 Heating cable catalog number

Surface Snow
Melting – ElectroMelt

Select the heating cable from Fig. 11 that provides the required power output to
match the corrected heat loss for your application. Fig. 11 shows the power output
for the heating cables on metal pipe at 120/208 volts. To correct the power output
for other applied voltage or plastic pipes multiply the power output at the desired
maintain temperature by the factors listed in Table 4 on page 64. If the pipe heat
loss, Qcorrected, is between the two heating cable power output curves, select the
higher-rated heating cable.
14



12
10



8
6

Freezer Frost
Heave Prevention

Power W/ft

Fire Sprinkler System
Freeze Protection

1. Determine design
conditions and
pipe heat loss

Pipe Freeze Protection
and Flow Maintenance

Fire Suppression System Freeze Protection Design



4
2
0
30
(–1)

40
(5)

50
(10)

60
(15)

70
(21)

80
(27)

90
(32)

100
(38)

110
(43)

120
(49)

130 °F
(54) (°C)



5XL1-CR and 5XL1-CT (120 V)
5XL2-CR and 5XL2-CT (208 V)



8XL1-CR and 8XL1-CT (120 V)
8XL2-CR and 8XL2-CT (208 V)



12XL2-CR and 12XL2-CT (208 V)

Floor Heating

Pipe temperature

Fig. 11 Heating cable power output on metal pipe

EN-RaychemXLTraceFireSprinkler-DG-H58489

11/13

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Fire Sprinkler System Freeze Protection — XL-Trace System
Table 4 Power Output Correction Factors
Voltage correction factors

5XL1

8XL1

5XL2

8XL2

12XL2

120 V

1.00

–

208 V

–

1.00

240 V

–

1.12

1.14

277 V

–

1.29

1.27

1.30

0.75

Plastic pipe correction factor
(With AT-180 Aluminum tape)

Confirm that the corrected power output of the heating cable selected is greater
than the corrected pipe heat loss (Qcorrected). If Qcorrected is greater than the power
output of the highest-rated heating cable, you can:
• Use two or more heating cables run in parallel
• Use thicker insulation to reduce heat loss
• Use insulation material with a lower k factor to reduce heat loss
Example: Fire Standpipe
Pipe maintain temperature (Tm) 40°F (4°C) (from Step 1)
Qcorrected Qcorrected = 9.8 W/ft @ Tm 40°F (32.1 W/m @ Tm 4°C)
Supply voltage

208 V (from Step 1)

Pipe material

Metal (from Step 1)

Select heating cable

Qcorrected = 9.8 W/ft @ Tm 40°F (from Step 1)

12XL2 = 12.4 W/ft @ 40°F (from Fig. 11)

Supply voltage correction factor 1.00 (from Table 4)
Pipe material correction factor

Metal = 1.00 (from Table 4)

Corrected heating cable power

9.8 W/ft x 1.00 x 1.00 = 9.8 W/ft

Selected heating cable

12XL2

Example: Branch Line with Sprinkler
Pipe maintain temperature (Tm) 40°F (4°C) (from Step 1)
Qcorrected

2.8 W/ft x 1.0 x 0.97 = 2.2 W/ft @ Tm 40°F (7.3W/m @ Tm 4°C)

Supply voltage

208 V (from Step 1)

Pipe material

Metal (from Step 1)

Select heating cable

Qcorrected = 2.2 W/ft @ Tm 40°F (from Step 1)

5XL2 = 5.6 W/ft @ 40°F (from Fig. 11)

Supply voltage correction factor 1.00 (from Table 4)

Pipe material correction factor

Metal = 1.00

Corrected heating cable power

5.6 x 1.00 x 1.00 = 5.6 W/ft

Selected heating cable

5XL2

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11/13

THERMAL MANAGEMENT SOLUTIONS

Select Outer Jacket

Example: Fire Standpipe
Location: Aboveground, outdoors
Selection: 12XL2-CR
Example: Branch Line with Sprinkler

Fire Sprinkler System
Freeze Protection

Select the appropriate heating cable outer jacket for the application. Jacket options
are:
-CR Compatible with most XL-Trace applications
-CT Required for buried piping; may be used in other XL‑Trace applications for
improved mechanical strength and chemical resistance.

Pipe Freeze Protection
and Flow Maintenance

Fire Suppression System Freeze Protection Design

Location: Aboveground, indoors

Pipe Freeze Protection
and Flow Maintenance

Step 3 Determine the heating cable length

1. Determine design
conditions and
pipe heat loss
2. Select the heating
cable

4. Determine the
electrical parameters
5. Select the
connection kits
and accessories
6. Select the control
system

Additional heating cable will be required for heat sinks and connection kits. Use
Table 5 and Table 6 to determine the additional footage required for heat sinks
(valves, flanges, and pipe supports). You will determine the additional heating cable
for connection kits in Step 5. Round up fractional lengths to ensure heating cable
lengths are sufficient.
Total heating cable = (Pipe length x No. + Additional heating cable for heat sinks
heating cable runs)
(valves, pipe supports, and flanges)
length required

Table 5 Additional Heating Cable for Valves
Pipe diameter (IPS) inches
1/2

Heating cable feet (meters)
0.8

(0.24)

3/4

1.3

(0.4)

2.0

(0.6)

1-1/4

3.3

(1.1)

1-1/2

4.3

(1.3)

4.3

(1.3)

4.3

(1.3)

4.3

(1.3)

5.0

(1.5)

5.0

(1.5)

5.6

(1.7)

5.9

(1.9)

7.3

(2.2)

9.4

(2.9)

10.5

(3.2)

11/13

Technical Data
Sheets

EN-RaychemXLTraceFireSprinkler-DG-H58489

Floor Heating

12
14

Freezer Frost
Heave Prevention

THERMAL MANAGEMENT SOLUTIONS

Surface Snow
Melting – ElectroMelt

7. Complete the Bill
of Materials

Heating cable length = Pipe length x No. heating cable runs

Surface Snow
Melting – MI

3. Determine the
heating cable length

In Step 2 you selected the appropriate heating cable and the number of runs of
heating cable required for the pipe. Multiply the length of the pipe by the number of
heating cable runs for the heating cable length.

Roof and Gutter
De-Icing

Selection: 5XL2-CR

Fire Sprinkler System Freeze Protection — XL-Trace System
Table 6 Additional Heating Cable for Pipe Supports, Flanges and
Sprinklers
Support

Additional cable

Pipe hangers (insulated)

No additional heating cable

Pipe hangers (noninsulated) and
U-bolt supports

Add 2x pipe diameter

Welded support shoes

Add 3x the length of the shoe

Flanges

Add 2x pipe diameter

Sprinklers
Sprinkler without sprig

Add 4x pipe diameter

Sprinkler with sprig

Add 3x sprig length

Dry sprinkler for freezer application

Add 2x sprinkler length

Note: For applications where more than one heating cable is required per foot of pipe,

this correction factor applies for each cable run.

Example: Fire Standpipe
Pipe length

50 ft (60 m) (from Step 1)

Pipe diameter

10-inch metal (from Step 1)

Number of heating cable runs

1 (from Step 2)

Valves

1 control valve

5.6 ft x 1 valve = 5.6 ft (1.7 m)

Pipe supports

5 pipe hangers with U-bolts

10-inch pipe diameter = 10/12 = 0.83

[0.83 ft pipe diameter x 2] x 5 pipe supports

= 8.3 ft (2.5 m)

Flanges 3

10-inch pipe diameter – 10/12 = 0.83 ft

[0.83 ft pipe diameter x 2] x 3 pipe supports

= 5.0 ft (1.5 m)

Total heating cable for heat sinks

5.6 ft (1.7 m) + 8.3 ft (2.5 m) + 5.0 ft (1.5 m)

= 18.9 ft (4.2 m) Rounded up to 19 ft (65 m)

Total heating cable length required 50 ft (15 m) x 1 run + 19 ft = 69 ft (21 m) of 12XL2-CR
Example: Branch Line with Sprinkler
Pipe length

200 ft (61 m) (from Step 1)

Pipe diameter

1-inch metal (from Step 1)

Number of heating cable runs

1 (from Step 2)

Valves

2 gate valves
[2.0 ft x 2 gate valves] x 1 run = 4.0 ft (1.2 m)

Pipe supports

10 noninsulated hangers
1-inch pipe diameter = 1 /12 = 0.1 ft
[0.1 ft pipe diameter x 2) x 10 pipe supports] x 1 run
= 2.0 ft (0.6 m)

Sprinklers

20 with 1 foot sprigs
[3 x 1 ft sprig] x 20 = 60 ft (18.3 m)

Total heating cable for heat sinks 4.0 ft (1.2 m) + 2.0 ft (0.6 m) + 60 ft (18.3 m)

= 66 ft (20.1 m)
Total heating cable length required 200 ft x 1 run + 66 ft = 266 ft (81 m) of 5XL2-CR

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THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection
and Flow Maintenance

Step 4 Determine the electrical parameters
To determine the electrical requirements for your application, you must determine
the number of circuits and calculate the transformer load.

2. Select the heating
cable

Fire Sprinkler System
Freeze Protection

1. Determine design
conditions and
pipe heat loss

Determine Number of Circuits

To determine the number of circuits, you need to know:

3. Determine the
heating cable length

• Total heating cable length

4. Determine the
electrical parameters

• Supply voltage
• Minimum start-up temperature

5. Select the
connection kits
and accessories

7. Complete the Bill
of Materials

Roof and Gutter
De-Icing

Use Table 7 to determine the maximum circuit length allowed. If the total heating
cable length exceeds the maximum circuit length for the expected start-up
temperature, more than one circuit will be required.

6. Select the control
system

Pipe Freeze Protection
and Flow Maintenance

Fire Suppression System Freeze Protection Design

Number of circuits = Heating cable length required
Maximum heating cable circuit length

Important: Select the smallest appropriate ground-fault circuit breaker size.

Surface Snow
Melting – MI

WARNING: To minimize the danger of fire from sustained electrical arcing if
the heating cable is damaged or improperly installed, and to comply with the
requirements of Pentair Thermal Management, agency certifications, and national
electrical codes, ground-fault equipment protection must be used on each heating
cable branch circuit. Arcing may not be stopped by conventional circuit protection.

Table 7 Maximum Circuit Length in Feet
40°F Maintain

–20°F

0°F

5XL2

120 V

8XL2

12XL2

208 V

240 V

277 V

208 V

240 V

277 V

208 V

240 V

277 V

101

174

178

183

131

138

146

111

114

117

134

101

232

237

245

175

184

194

148

151

156

201

151

349

356

367

262

276

291

223

227

234

270

201

465

474

478

349

368

388

297

303

312

115

199

203

209

149

157

166

120

122

126

153

115

265

271

279

199

209

221

160

163

168

230

172

398

406

419

298

314

331

239

244

252

270

210

470

490

530

370

390

420

319

326

336

134

100

232

237

244

173

182

192

126

129

133

178

133

309

315

325

231

243

257

169

172

177

270

200

464

473

488

346

365

385

253

258

266

270

210

470

490

530

370

390

420

340

344

355

160

119

278

283

292

206

217

229

142

145

150

214

159

370

378

390

275

290

306

190

194

200

270

210

470

490

530

370

390

420

285

291

300

270

210

470

490

530

370

390

420

340

360

380

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating

40°F

8XL1

Freezer Frost
Heave Prevention

20°F

5XL1
CB size
(A)
120 V

Surface Snow
Melting – ElectroMelt

Start-up
temperature
(°F)

Fire Sprinkler System Freeze Protection — XL-Trace System
Table 8 Maximum Circuit Length in Meters
Start-up
temperature
(°C)
–29°C

–18°C

–7°C

4°C

4°C Maintain
5XL1
CB size
(A)
120 V

8XL1

5XL2

8XL2

12XL2

120 V

208 V

240 V

277 V

208 V

240 V

277 V

208 V

240 V

277 V

106

108

112

142

145

149

106

112

118

121

124

128

101

143

149

162

113

119

128

102

141

144

149

106

111

117

143

149

162

113

119

128

104

105

108

113

115

119

143

149

162

113

119

128

143

149

162

113

119

128

104

110

116

Example: Fire Standpipe
Total heating cable length

69 ft (21 m) of 12XL2-CR (from Step 3)

Supply voltage

208 V (from Step 1)

Minimum start-up temperature –20°F (–29°C) (from Step 1)
Number of circuits

69 ft / (111 ft max 15 A CB at –20°F) = 0.6 circuits

Round up to 1 circuit

Example: Branch Line with Sprinkler
Total heating cable length

266 ft (81 m) of 5XL2-CT (from Step 3)

Supply voltage

208 V (from Step 1)

Minimum start-up temperature 0°F (–18°C) (from Step 1)
Number of circuits

266 ft / (398 ft max 30 A CB at 0°F) = 0.67 circuits

Round up to 1 circuit

Determine Transformer Load

Transformers must be sized to handle the load of the heating cable. Use the
following tables to calculate the total transformer load.

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THERMAL MANAGEMENT SOLUTIONS

Table 9 Transformer Sizing (Amperes/foot)
Minimum start-up
temperature (°F)

5XL1

8XL1

120

5XL2
208

8XL2

240

277

208

240

12XL2
277

208

240

277

0.119

0.159

0.069

0.067

0.065

0.092

0.087

0.082

0.108

0.106

0.102

0.105

0.139

0.060

0.059

0.057

0.080

0.076

0.072

0.100

0.098

0.095

0.090

0.120

0.052

0.051

0.049

0.069

0.066

0.062

0.095

0.093

0.090

0.075

0.101

0.043

0.042

0.041

0.058

0.055

0.052

0.084

0.083

0.080

Table 10 Transformer Sizing (Amperes/meter)
8XL1

120

5XL2
208

8XL2

240

277

208

240

12XL2
277

208

240

277

–20

0.391

0.521

0.226

0.221

0.215

0.301

0.286

0.270

0.354

0.347

0.336

–18

0.343

0.457

0.198

0.194

0.188

0.264

0.251

0.238

0.329

0.322

0.312

–7

0.294

0.394

0.170

0.166

0.161

0.227

0.216

0.205

0.311

0.305

0.296

0.246

0.331

0.142

0.139

0.135

0.191

0.181

0.172

0.276

0.271

0.263

Max A/ft at minimum start-up temperature x Heating cable length (ft)
x Supply voltage
1000

= Transformer
load (kW)

Surface Snow
Melting – MI

Use Table 9 or Table 10 to determine the applied voltage and the maximum A/ft (A/m)
at the minimum start-up temperature to calculate the transformer load as follows:

Roof and Gutter
De-Icing

5XL1

Fire Sprinkler System
Freeze Protection

–20

Minimum start-up
temperature (°C)

Pipe Freeze Protection
and Flow Maintenance

Fire Suppression System Freeze Protection Design

Example: Fire Standpipe
69 ft (21 m) of 12XL2-CR (from Step 3)

Supply voltage

208 V

Minimum start-up temperature

–20°F (–29°C) (from Step 1)

Max A/ft at –20°F x Total feet
x Supply voltage
1000
Transformer load (kW)

Surface Snow
Melting – ElectroMelt

Total heating cable length

= (0.108 A/ft x 69 ft x 208 V) / 1000

= 1.68 kW
Freezer Frost
Heave Prevention

Example: Branch Line with Sprinkler
Total heating cable length

266 ft (81 m) of 5XL2-CT (from Step 3)

Supply voltage

208 V

Minimum start-up temperature

0°F (–18°C) (from Step 1)

1000
Transformer load (kW)

= (0.060 A/ft x 266 ft x 208 V) / 1000

= 3.3 kW

EN-RaychemXLTraceFireSprinkler-DG-H58489

11/13

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating

Max A/ft at 0°F x Total feet
x Supply voltage

Step 5 Select the connection kits and accessories
All XL-Trace systems require a power connection and end seal kit. Splice and tee kits
are used as required. Use Table 11 on page 71 (for aboveground applications) and
Table 13 on page 73 (for buried applications) to select the appropriate connection
kits.
Note: Add extra cable on your Bill of Materials for power connections, tees, and
end seals. See Table 11 on page 71, Table 13 on page 73, and Table 14 on page
74 for more information.
WARNING: Approvals and performance are based on the use of Pentair
Thermal Management-specified parts only. Do not substitute parts or use vinyl
electrical tape.
Aboveground Piping

End seal
Tee

Cross
Sprinkler
Insulation

Line sensing
RTD

Splice
RayClic-LE
lighted end seal
(optional)

Power
connection

Junction
box

Ambient
sensing
RTD

DigiTrace
C910-485

Fig. 12 RayClic connection system

Use the following table for general piping, standpipe and sprinkler. Develop a Bill of
Materials from the connection kits listed in the following table.

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THERMAL MANAGEMENT SOLUTIONS

Table 11 Connection Kits and Accessories for Aboveground Piping
Catalog
number

Description

Standard
packaging

Usage

Heating cable
allowance1

Power connection and end seal (RayClicSB-04 pipe mounting bracket included)

1 per circuit

2 ft (0.6 m)

RayClic-PS

Powered splice and end seal (RayClicSB-04 pipe mounting bracket included)

1 per circuit

4 ft (1.2 m)

RayClic-PT

Powered tee and end seal (RayClic-SB-04
pipe mounting bracket included)

1 per circuit

6 ft (1.8 m)

FTC-P2

Power connection and end seal kit

1 per circuit

3 ft (0.9 m)

Roof and Gutter
De-Icing

RayClic-PC

Fire Sprinkler System
Freeze Protection

Connection kits

Pipe Freeze Protection
and Flow Maintenance

Fire Suppression System Freeze Protection Design

Note: FTC-P is required for circuits
requiring 40 A circuit breakers.

2 ft (0.6 m)

RayClic-T

Tee kit with end seal;
use as needed for pipe
branches

As required

3 ft (0.9 m)

RayClic-X

Cross connection to connect four heating
cables

As required

8 ft (2.4 m)

FTC-HST3

Low-profile splice/tee; use as
needed for pipe branches

As required

3 ft (0.9 m)

RayClic-LE

Lighted end seal (RayClic-SB-04 pipe
mounting bracket included)

Alternate end seal

2 ft (0.6 m)

RayClic-E

Replacement end seal

Freezer Frost
Heave Prevention

As required

Surface Snow
Melting – ElectroMelt

Surface Snow
Melting – MI

Splice used to join two
sections of heating cable

RayClic-S

Additional end seal 0.3 ft (0.1 m)

Floor Heating

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11/13

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Fire Sprinkler System Freeze Protection — XL-Trace System
Table 11 Connection Kits and Accessories for Aboveground Piping
Catalog
number

Standard
packaging

Description

Heating cable
allowance1

Usage

Accessories
1

As required

–

RayClic-SB-02 Wall mounting bracket

As required

–

ETL

“Electric Traced” label (use 1 label
per 10 feet of pipe)

1 label per 10 feet
(3 m) of pipe

–

GT-66

Glass cloth adhesive tape for
attaching heating cable to pipe at
40°F (4°C) or above.

66 ft (20 m)

See Table 12

–

GS-54

Glass cloth adhesive tape for
attaching heating cable to pipe
above –40°F (–40°C).

54 ft (20 m)

See Table 12

–

AT-180

Aluminum tape. Required for
attaching heating cable to plastic
pipe (use 1 foot of tape per foot of
heating cable)

180 ft (55 m) 1 ft/ft (0.3 m/m) of
heating cable

0 AIR nag
TH
H5 ER em
76 MA ent
57
L.C LL
C
07 OM
/13

ec
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ic

W
AR

tT N
ra IN
ci G
ng

RayClic-SB-04 Pipe mounting bracket. Required
for mounting the kits off the pipe
for exposure temperatures greater
than 150°F (65°C) and for grease
and fuel line splices and tees.

–

1 Allow extra heating cable for ease of component installation.
2 Junction box not included.
3 One RayClic-E end seal is required for each FTC-HST used as a tee kit.

Table 12 Quantity of Glass Cloth Adhesive Tape Required (attach at 1-foot intervals)
Pipe size (in)

Feet of pipe per GT-66 roll

60 (18 m)

50 (15 m)

40 (12 m)

25 (8 m)

20 (6 m)

15 (5 m)

Feet of pipe per GS-54 roll

49 (15 m)

41 (13 m)

33 (10 m)

20 (6 m)

16 (5 m)

12 (4 m)

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11/13

THERMAL MANAGEMENT SOLUTIONS

Buried Piping

Pipe Freeze Protection
and Flow Maintenance

Fire Suppression System Freeze Protection Design

DigiTrace C910-485
Electronic controller

Fire Sprinkler System
Freeze Protection

Alternate
end seal

RayClic-LE*

FTC-XC
power
connection

Wall

Conduit

with wall
mounting
bracket

Conduit for
temperature
sensor

Ground

Temperature sensor

Roof and Gutter
De-Icing

Junction box
Insulation RayClic-E
end seal

RayClic-PC* Ground

Conduit

with wall
mounting
bracket

XL-Trace
heating cable
with -CT jacket
*To protect the heating cable, run cable
inside Convolex tubing between the
conduit and the RayClic connection kits.

Surface Snow
Melting – MI

Alternate
power connection

Wall

Fig. 13 Typical buried supply piping system

Use the following for buried water supply piping. Note that all connections must be
aboveground and that no splices/tees are allowed. Develop a Bill of Materials from
the connection kits in this table.

Catalog
number

Description

Standard
packaging

Usage

Heating cable
allowance1

Power connection and end seal kit
(RayClic-SB-04 pipe mounting bracket
included)

1 per circuit

2 ft (0.6 m)

FTC-XC2

1
The FTC-XC power connection and end
seal kit is for use with XL-Trace heating
cable that is run through conduit to a junction box. Materials for one power connection and end seal is included in the kit.

1 per circuit

2 ft (0.6 m)

Freezer Frost
Heave Prevention

RayClic-PC

Note: FTC-XC is required for circuits
requiring 40 A circuit breakers.
Lighted end seal (RayClic-SB-04 pipe
mounting bracket included)

Alternate end seal

RayClic-E

Replacement end seal

Additional end seal 0.3 ft (0.1 m)

EN-RaychemXLTraceFireSprinkler-DG-H58489

11/13

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating

RayClic-LE

Surface Snow
Melting – ElectroMelt

Table 13 Connection Kits and Accessories for Buried Piping

Fire Sprinkler System Freeze Protection — XL-Trace System
Table 13 Connection Kits and Accessories for Buried Piping
Catalog
number

Standard
packaging

Usage

RayClic-SB-04 Pipe mounting bracket

As required

–

RayClic-SB-02 Wall mounting bracket

As required

–

ETL

“Electric Traced” label (use 1
label per 10 feet of pipe)

1 label per 10 feet
(3 m) of pipe

–

GT-66

Glass cloth adhesive tape for
attaching heating cable to pipe at
40°F (4°C) or above

66 ft (20 m)

See Table 14

–

GS-54

Glass cloth adhesive tape for
attaching heating cable to pipe
above –40°F (–40°C)

54 ft (20 m)

See Table 14

–

AT-180

Aluminum tape. Required for
attaching heating cable to plastic
pipe (use 1 foot of tape per foot of
heating cable)

180 ft (55 m)

1 ft/ft (0.3 m/m) of
heating cable

–

Description

Heating cable
allowance1

0 AIR nag
TH
H5 ER em
76 MA ent
57
L.C LL
C
07 OM
/13

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tT N
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ng

Accessories

1 Allow extra heating cable for ease of component installation.
2 Junction box not included.

Table 14 Quantity of Glass Cloth Adhesive Tape Required (attach at 1-foot intervals)
Pipe size (in)

Feet of pipe per GT-66 roll

60 (18 m)

50 (15 m)

40 (12 m)

25 (8 m)

20 (6 m)

15 (5 m)

Feet of pipe per GS-54 roll

49 (15 m)

41 (13 m)

33 (10 m)

20 (6 m)

16 (5 m)

12 (4 m)

EN-RaychemXLTraceFireSprinkler-DG-H58489

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THERMAL MANAGEMENT SOLUTIONS

Pipe
Pipe Freeze
Freeze Protection
Protection
and
and Flow
Flow Maintenance
Maintenance

Step 6 Select the control system

1. Determine design
conditions and
pipe heat loss

3. Determine the
heating cable length
4. Determine the
electrical parameters
5. Select the
connection kits
and accessories

7. Complete the Bill
of Materials

• Temperature controls save energy by ensuring that the system is energized only
when necessary.
• Superior accuracy and reliability with RTD temperature sensors.
• Integrated 30 mA ground-fault protection for cost savings and circuit protection.
• Self-test features to ensure the heating cable circuit integrity even when the system is not in demand.
• Modbus® protocol communication over RS-485 system is supported using
DigiTrace ProtoNode multi-protocol gateways.
• Dry contact alarm relay outputs for loss of power, low temperature, RTD failure,
relay failure and ground-fault trip.

Surface Snow
Melting – MI

Note: NFPA 13 requires that heat tracing for fire suppression systems are
supervised by controllers with alarm relays connected to the fire control panel.

Roof and Gutter
De-Icing

6. Select the control
system

DigiTrace C910-485 and ACS-30 are the only controllers approved for this
application:

Fire Sprinkler System
Freeze Protection

2. Select the heating
cable

Temperature control with heating cable circuit supervision is required by approval
agencies, codes and Pentair Thermal Management. To satisfy this requirement
Pentair Thermal Management offers a wide variety of monitoring and control options
for fire suppression system.

Pipe Freeze Protection
and Flow Maintenance

Fire Suppression System Freeze Protection Design

Use the following table to identify the control system suitable for your application.
Contact your Pentair Thermal Management representative or contact Pentair
Thermal Management directly at (800) 545-6258 for more information and other
control options.
Table 15 Temperature Control Options
Application

DigiTrace ACS-30

Ambient sensing

Line sensing

Buried pipe

Proportional ambient control

Fire sprinklers

Sensor

RTD

See data sheet

Setpoint range

30°F to 200°F (–1°C to 92°C)

Enclosure

NEMA 4X

Differential

3°F (1.6°C)

Setpoint repeatability
Enclosure limits

3°F (1.6°C)

–40°F to 140°F (–40°C to 60°C)

30 A

Switch rating
Switch type
Electrical rating

DPST
100–277 V

c-CSA-us

20 mA to 100 mA

BMS interface

Standard

Modbus1

Alarm outputs

AC relay dry contact relay

Ground-fault protection

Floor Heating

Approvals

DPST
100–277 V

Freezer Frost
Heave Prevention

RTD

Sensor length

Surface Snow
Melting – ElectroMelt

DigiTrace C910-485

1 DigiTrace ProtoNode multi-protocol gateways are available from Pentair Thermal Management.

EN-RaychemXLTraceFireSprinkler-DG-H58489

11/13

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Fire Sprinkler System Freeze Protection — XL-Trace System
Table 16 Control Systems
Catalog number

Description

Electronic Controllers and Sensors
C910-485

The DigiTrace C910-485 is a compact, full-featured microprocessor-based singlepoint heat-trace controller. The C910-485 provides control and monitoring of electrical
heat-tracing circuits for both freeze protection and temperature maintenance, and can
be set to monitor and alarm for high and low temperature, and ground-fault level. The
C910-485 controller is available with an electromechanical relay (EMR). Communications modules are available for remote control and configuration.
The DigiTrace C910-485 includes RS-485 communications module for interfacing with
Building Management Systems (BMS) and fire control panels.

A0
A1
A2
A3
A4
A5
A6
A7

ACS-UIT2
ACS-PCM2-5

The DigiTrace ACS-30 Advanced Commercial Control System is a multipoint electronic
control and monitoring system for heat-tracing used in commercial freeze protection
and flow maintenance applications. The DigiTrace ACS-30 system can control up to 260
circuits with multiple networked ACS-PCM2-5 panels, with a single ACS-UIT2 user
interface terminal. The ACS-PCM2-5 panel can directly control up to 5 individual heattracing circuits using electromechanical relays rated at 30 A up to 277 V.

ProtoNode-LER
ProtoNode-RER

The DigiTrace ProtoNode is an external, high performance multi-protocol gateway for
customers needing protocol translation between Building Management Systems (BMS)
and the DigiTrace ACS-30 or C910-485 controllers.

PROTOCESSOR
SERIAL ETHERNET

PROTONODE

B0
B1
B2
B3
S0
S1
S2
S3

By FieldServer Technologies
www.ProtoCessor.com

The ProtoNode-LER is for LonWorks® systems; and the ProtoNode-RER is for BACnet®
or Metasys® N2 systems.
RS 485 GND
RS 485 RS 485+

+PWR
- PWR
FRAME GND

RTD-200
RTD3CS
RTD10CS
RTD50CS

Pipe Freeze Protection
and Flow Maintenance
1. Determine design
conditions and
pipe heat loss

Three-wire RTD (Resistance Temperature Device) used with DigiTrace C910-485 and
ACS-30 controllers.
RTD-200: 6-ft (1.8 m) fluorpolymer with 1/2-in NPT bushing
RTD3CS: 3-ft (0.9 m) flexible armor with 1/2-in NPT bushing
RTD10CS: 10-ft (3 m) flexible armor with 1/2-in NPT bushing
RTD50CS: 50-ft (3 m) flexible armor with 1/2-in NPT bushing

Step 7 Complete the Bill of Materials
If you used the Design Worksheet to document all your design parameters, you
should have all the details necessary complete your Bill of Materials.

2. Select the heating
cable
3. Determine the
heating cable length
4. Determine the
electrical parameters
5. Select the
connection kits
and accessories
6. Select the control
system
7. Complete the Bill
of Materials

EN-RaychemXLTraceFireSprinkler-DG-H58489

11/13

THERMAL MANAGEMENT SOLUTIONS

Installation and Maintenance
Follow the installation and maintenance procedures in the XL-Trace System
Installation and Operation Manual (H58033) when installing XL-Trace on fire
suppression systems with the following additional instructions.

Fire Sprinkler System
Freeze Protection

When installing XL-Trace on sprinklers follow the methods shown below:
Sprinkler head without sprig

Sprinkler head with sprig

Roof and Gutter
De-Icing

Insulation
(Use outer diameter of thermal insulation
when determining the spray shadowing in
your sprinkler system.)

Additional heating cable length = Pipe diameter x 4

Pipe Freeze Protection
and Flow Maintenance

Installation and Maintenance

Surface Snow
Melting – MI

Sprig
length

Surface Snow
Melting – ElectroMelt

Additional heating cable length = Sprig length x 3

Fig. 14 XL-Trace on sprinklers

When installing XL-Trace on dry pendant sprinklers used in freezer applications
follow the methods shown below:
Sprinkler pipe

Freezer Frost
Heave Prevention

Note: The orientation and type of sprinkler head shown above is only for
reference. The illustrations only depict the amount of heat tracing required and how
to install it.

Thermal pipe insulation

Floor Heating

Freezer

XL-Trace heating cable
Length = 2 x dry sprinkler length

Freezer wall
insulation

Fig. 15 XL-Trace on extended pendant sprinklers

EN-RaychemXLTraceFireSprinkler-DG-H58489

11/13

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Fire Sprinkler System Freeze Protection — XL-Trace System
XL-Trace System Fire Sprinkler System Freeze Protection Design Worksheet
XL-Erate, the commercial pipe freeze protection and flow maintenance design
software is available at http://www.pentairthermal.com to assist with your design.

Step  Determine design conditions and pipe heat loss
Design conditions

Fire sprinkler
system
❑ Supply piping
❑ Standpipe

Min.
Maintain ambient
temp.
temp.
(Tm)
(Ta )

Location

Pipe diameter
and material

Pipe
length

Thermal insulation
type and thickness

❑ Indoors ❑ Aboveground
❑ Outdoors ❑ Buried
______

______

____ in

❑ Metal
❑ Fiberglass
❑ Plastic _____ ft (m) ❑ ________

____ in

❑ Sprinkler piping ❑ Indoors ❑ Aboveground
❑ Outdoors ❑ Buried
______

______

____ in

❑ Metal
❑ Fiberglass
❑ Plastic _____ ft (m) ❑ ________

____ in
____ in

❑ Branchpipe

❑ Indoors ❑ Aboveground
❑ Outdoors
______

______

____ in

❑ Fiberglass
❑ Metal
❑ Plastic _____ ft (m) ❑ ________

❑ Branchpipe with ❑ Indoors ❑ Aboveground
sprinkler
❑ Outdoors
______

______

____ in

❑ Metal
❑ Fiberglass
❑ Plastic _____ ft (m) ❑ ________

____ in

50°F

1 in

0 Metal

1/2 in

Example:
0 Branch line
with sprinkler

0 Indoor

40°F

200 ft

0 Foam

elastomer

Pipe heat loss
Calculate temperature differential ΔT
Pipe maintain temperature (TM)
Ambient temperature (TA)

°F (°C)
°F (°C)
=

−
TA

∆T

Example: Pipe Freeze Protection − Branch line with sprinkler
Pipe maintain temperature (TM)

40 °F

Ambient temperature (TA)

0 °F

40 °F
TM

−

(from Step 1)

°F
(from Step 1)

°F
0 °F

40 °F
∆T

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THERMAL MANAGEMENT SOLUTIONS

Determine the pipe heat loss: See Table 1 for the base heat loss of the pipe (Qb). If the ΔT for your system is not listed, interpolate between the two closest values.
QB-T1 ∆T1

W/ft (W/m)

Fire Sprinkler System
Freeze Protection

QB-T2 ∆T2

W/ft (W/m)
W/ft (W/m)

Pipe diameter
in
Insulation thickness

in
Roof and Gutter
De-Icing

∆T

°F (°C)

QB-T1
W/ft (W/m)
QB-T2

Pipe Freeze Protection
and Flow Maintenance

XL-Trace System Fire Sprinkler System Freeze Protection Design Worksheet

W/ft (W/m)

Example: Pipe Freeze Protection − Branch line with sprinkler

Insulation thickness
∆T

1 in

Surface Snow
Melting – MI

Pipe diameter

1/2 in
40°F

QB-T1

1.4 W/ft

QB-T2

3.5 W/ft
∆T 40°F is 67% of the distance between ∆T 20°F and ∆T 50°F

QB-40

QB-50 + [0.67 x (QB-50 − QB-20)] = 1.4 + [0.67 x (3.5 − 1.4)] = 2.8 W/ft

Pipe heat loss (QB)

2.8 W/ft @ TM 40°F (9.2 W/m @ TM4°C)

Surface Snow
Melting – ElectroMelt

∆T interpolation

Freezer Frost
Heave Prevention
Floor Heating

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Fire Sprinkler System Freeze Protection — XL-Trace System
Compensate for insulation type and pipe location

See Table 1 for the pipe heat loss (Qb). If the ΔT for your system is not listed, interpolate between the two closest values.
See Table 3 for insulation multiple
See Table 2 for indoor multiple
Location
Insulation thickness and type
QB

W/ft (W/m)

Insulation multiple
Indoor multiple (if applicable)

Insulation multiple

Indoor multiple
(if applicable)

QCORRECTED

Example: Pipe Freeze Protection − Branch line with sprinklers
Location

Indoors

Insulation thickness and type

1-1/2 in foamed elastomer

2.8 W/ft @ TM 40°F (9.2 W/m @ TM 4°C)

Insulation multiple

1.00

Indoor multiple

0.79

QCORRECTED

2.8 W/ft x 1.0 x 0.79 = 2.2 W/ft @ TM40°F (7.3/m @ TM4°C)

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THERMAL MANAGEMENT SOLUTIONS

Step  Select the heating cable
Power output data: See Fig. 11
Power output correction factors: See Table 4
(from Step 1)

Corrected heat loss (QCORRECTED)

(from Step 1)

Supply voltage

(from Step 1)

Pipe material (metal or plastic)

(from Step 1)

XL-Trace sprinkler application

(from Step 1)

Fire Sprinkler System
Freeze Protection

Pipe maintain temperature (TM)

Roof and Gutter
De-Icing

Indoor/outdoor
Aboveground/buried
Location

(from Step 1)

Heating cable selected

(from Step 1)

Pipe Freeze Protection
and Flow Maintenance

XL-Trace System Fire Sprinkler System Freeze Protection Design Worksheet

Power at TM (120/208 V)
Power output correction factor

(from Step 1)

Power at rated V factor

=
Plastic pipe correction factor

Surface Snow
Melting – MI

Plastic pipe correction factor

Corrected power

Surface Snow
Melting – ElectroMelt

40°F

Maintain temperature (TM)

2.2 W/ft @ TM 40°F

Corrected heat loss (QCORRECTED)
Supply voltage

208 V

Pipe material (metal or plastic)

metal

(*AT-180 aluminum tape required for
installing heating cable on plastic pipes)

Freezer Frost
Heave Prevention

QB = 2.2 W/ft @ TM 40°F
Select curve C: 5XL2 = 5.6 W/ft @ 40°F
Power output correction factor: 208 V = 1.00
Pipe material correction factor: Metal = 1.00
Corrected heating cable power: 5.6 @/ft x 1.00 x 1.00 = 5.6 W/ft
Select: 5XL2

Select outer jacket
❑ -CR
❑ -CT (Required for buried applications)
Floor Heating

Example: Pipe Freeze Protection − Branch line with sprinklers
Location

Aboveground, indoors

Selection:

5XL2-CR

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Fire Sprinkler System Freeze Protection — XL-Trace System
Step  Determine the heating cable length
For additional heating cable allowance for valves: See Table 5
For additional heating cable allowance for pipe supports, flanges and sprinklers: See Table 6.
Additional heating cable for heat sinks
Type of valves

How many

Type of pipe supports

How many

Type of flanges

How many

Type of sprinklers

How many

=
Additional heating cable

Total heating cable
for valves
=

Additional heating cable

Total heating cable
for pipe supports
=

Additional heating cable

Total heating cable
for flanges
=

Additional heating cable

Total heating cable
for sprinklers

Total heating cable for heat sinks:

Total heating cable length

(

Pipe length

)

=
Additional cable for valves,
pipe supports, flanges, and sprinklers
+

Number of heating
cable runs

Total heating cable
length required

Example:

Additional heating cable for heat sinks
Gate valves

Type of valves

How many

Noninsulated hangers

Type of pipe supports

How many

1 foot springs

Type of sprinklers

How many

2 ft

Additional heating cable

(0.1 ft* x 2) x 10 = 2 ft

Additional heating cable

1.7 ft
Total

(*1-in pipe = 1-in/12-in = 0.1 ft)

4 ft
Total

Additional heating cable

60 ft
Total

Total:

66 ft

Total heating cable length

(

200 ft
Pipe length

)

Number of heating
cable runs

66 ft

Additional cable for valves,
pipe supports, flanges, and sprinklers

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266 ft
Total heating cable
length required

THERMAL MANAGEMENT SOLUTIONS

Step  Determine the electrical parameters
Determine maximum circuit length and number of circuits
See Table 7 and Table 8.

Supply voltage:

T 120 V
T 240 V

T 208 V
T 277 V

Circuit breaker size:

T 15 A
T 30 A

T 20 A
T 40 A

Fire Sprinkler System
Freeze Protection

Total heating cable length required

Minimum start-up temperature

Maximum heating cable circuit length

Roof and Gutter
De-Icing

Maximum circuit length
Total heating cable length required

Pipe Freeze Protection
and Flow Maintenance

XL-Trace System Fire Sprinkler System Freeze Protection Design Worksheet

Number of circuits

Example:

Total heating cable length required 266 ft of 5XL2-CT
T 120 V
T 240 V

T9208 V
T 277 V

Circuit breaker size:

T 15 A
930 A
T

T 20 A
T 40 A
0°F

Minimum start-up temperature

0.67 ft

Number of circuits
266 ft

398 ft
Maximum heating cable circuit length

0.67 circuits, round up to 1
Number of circuits

Surface Snow
Melting – ElectroMelt

Total heating cable length required

Surface Snow
Melting – MI

Supply voltage:

Determine transformer load
See Table 9 and Table 10.
Max A/ft* at minimum start-up temperature

Heating cable length

Supply voltage

/ 1000

Transformer
load (kW)

Freezer Frost
Heave Prevention

/ 1000

Example:
0.06 A/ft
Max A/ft* at minimum start-up temperature

266 ft
Heating cable length

208 V
Supply voltage

3.3 kW
Transformer
load (kW)

Floor Heating

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Fire Sprinkler System Freeze Protection — XL-Trace System
Step  Select the connection kits and accessories
See Table 11.

Connection kits – Aboveground

Description

Quantity

Heating cable
allowance

❑ RayClic-PC

Power connection and end seal

____________

__________________

❑ RayClic-PS

Power splice and end seal

____________

__________________

❑ RayClic-PT

Powered tee and end seal

____________

__________________

❑ FTC-P

Power connection and end seal

____________

__________________

❑ RayClic-S

Splice

____________

__________________

❑ RayClic-T

Tee kit with end seal

____________

__________________

❑ RayClic-X

Cross connection

____________

__________________

❑ FTC-HST

Low-profile splice/tee

____________

__________________

❑ RayClic-LE

Lighted end seal

____________

__________________

❑ RayClic-E

Extra end seal

____________

__________________

Connection kits – Buried

Description

Quantity

Heating cable
allowance

❑ RayClic-PC

Power connection and end seal

____________

__________________

❑ FTC-XC

Power splice and end seal

____________

__________________

❑ RayClic-LE

Lighted end seal

____________

__________________

❑ RayClic-E

Extra end seal

____________

__________________

Accessories – Aboveground and
buried

Description

Quantity

❑ RayClic-SB-04

Pipe mounting bracket

_____________

❑ RayClic-SB-02

Wall mounting bracket

_____________

❑ ETL

“Electric-Traced” label

_____________

❑ GT-66

Glass cloth adhesive tape

_____________

❑ GS-54

Glass cloth adhesive tape
Aluminum tape (for plastic pipes)

_____________

❑ AT-180

_____________
Total heating cable
allowance for connection kits

Total heating cable length

+
Total heating cable allowance for connection kits

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Total heating cable
length required

THERMAL MANAGEMENT SOLUTIONS

Step  Select the control system
See Table 16.

Quantity

Microprocessor-based single-point heat-tracing controller
with RS-485 communication

_____________

❑ ACS-UIT2

ACS-30 user interface terminal

_____________

❑ ACS-PCM2-5

ACS-30 power control panel

_____________

❑ ProtoNode-LER

Multi-protocol gateway

_____________

❑ ProtoNode-RER

Multi-protocol gateway

_____________

❑ RTD3CS

Resistance temperature device

_____________

❑ RTD10CS

Resistance temperature device

_____________

❑ RTD-200

Resistance temperature device

_____________

❑ RTD50CS

Resistance temperature device

_____________

❑ C910-485

Roof and Gutter
De-Icing

Description

Fire Sprinkler System
Freeze Protection

Thermostats, controllers
and accessories

Pipe Freeze Protection
and Flow Maintenance

XL-Trace System Fire Sprinkler System Freeze Protection Design Worksheet

Step 7 Complete the Bill of Materials
Use the information recorded in this worksheet to complete the Bill of Materials.
Surface Snow
Melting – MI
Surface Snow
Melting – ElectroMelt
Freezer Frost
Heave Prevention
Floor Heating

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Fire Sprinkler System Freeze Protection — XL-Trace System

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THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection
and Flow Maintenance
Fire Sprinkler System
Freeze Protection

Roof and Gutter De-icing —
IceStop System

Surface Snow
Melting – ElectroMelt
Freezer Frost
Heave Prevention

Raychem IceStop is a roof and gutter de-icing system that provides drain paths for
the following applications:

Surface Snow
Melting – MI

Introduction

Contents
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
How to Use this Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Safety Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
System Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Typical System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Self-Regulating Heating Cable Construction. . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Approvals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Roof and Gutter De-Icing Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Design Step by Step. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Step 1 Determine design conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Step 2 Select the heating cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Step 3 Determine the heating cable length. . . . . . . . . . . . . . . . . . . . . . . . . . 94
Step 4 Determine the electrical parameters. . . . . . . . . . . . . . . . . . . . . . . . 102
Step 5 Select the connection kits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Step 6 Select attachment accessories and method. . . . . . . . . . . . . . . . . . 107
Step 7 Select the control system and power distribution. . . . . . . . . . . . . . 113
Step 8 Complete the Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
IceStop System Roof and Gutter De-Icing Design Worksheet. . . . . . . . . . . . . . . . . 120

Roof and Gutter
De-Icing

This step-by-step design guide provides the tools necessary to design a Raychem
IceStop roof and gutter de-icing system. For other applications or for design
assistance, contact your Pentair Thermal Management representative or phone
Pentair Thermal Management at (800) 545‑6258. Also, visit our web site at
www.pentairthermal.com.

• Roofs made from standard roofing materials, including shake, shingle, rubber,
tar, wood, metal, and plastic.
• Gutters made from standard materials, including metal, plastic, and wood.
• Downspouts made from standard materials, including metal and plastic.
The guide does not cover applications in which any of the following conditions exist:

• Melting snow on a roof and/or reduction of snow load — IceStop is designed to
remove melt water, not accumulated snow.

Floor Heating

• Preventing snow movement on roofs — IceStop will not keep snow or ice from
falling off the roof. IceStop is designed to remove melt water, not accumulated
snow. Snow fences or snow guards should be used to eliminate snow movement.

If your application conditions are different, or if you have any questions, contact
your Pentair Thermal Management representative, or contact Pentair Thermal
Management directly at (800) 545-6258.

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Roof and Gutter De-icing — IceStop System
How to Use this Guide
This design guide presents Pentair Thermal Management’ recommendations
for designing an IceStop roof and gutter de-icing system. It provides design
and performance data, electrical sizing information, and heating-cable layout
suggestions. Following these recommendations will result in a reliable, energyefficient system.
Other Required Documents

This guide is not intended to provide comprehensive installation instructions. For
complete IceStop roof and gutter de-icing system installation instructions, please
refer to the following additional required documents:
• IceStop System Installation and Operation Manual (H58067)
• Additional installation instructions that are included with the connection kits,
thermostats, controllers, and accessories
If you do not have these documents, you can obtain them from the Pentair Thermal
Management web site at www.pentairthermal.com.
For products and applications not covered by this design guide, please contact your
Pentair Thermal Management representative or call Pentair Thermal Management
directly at (800) 545-6258.
Safety Guidelines
As with any electrical equipment, the safety and reliability of any system depends
on the quality of the products selected and the manner in which they are installed
and maintained. Incorrect design, handling, installation, or maintenance of any of
the system components could damage the system and may result in inadequate
performance, overheating, electric shock, or fire. To minimize these risks and to
ensure that the system performs reliably, read and carefully follow the information,
warnings, and instructions in this guide.
This symbol identifies important instructions or information.

This symbol identifies particularly important safety warnings that must be
followed.

Warranty
Pentair Thermal Management’ standard limited warranty applies to Raychem Roof
and Gutter De-icing Systems.
An extension of the limited warranty period to ten (10) years from the date of
installation is available, except for the control and distribution systems, if a properly
completed online warranty form is submitted within thirty (30) days from the date of
installation. You can access the complete warranty on our web site at
www.pentairthermal.com.

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THERMAL MANAGEMENT SOLUTIONS

System Overview

Fire Sprinkler System
Freeze Protection

The Raychem IceStop system can prevent ice dams and icicles by maintaining a
continuous path for melt water to drain from the roof. The IceStop system uses
a self-regulating heating cable which reduces heat output automatically as the
cable warms to above freezing, resulting in lower energy use, and eliminating the
possibility of overheating. A typical roof and gutter de-icing system includes the
IceStop self-regulating heating cables, connection kits, control system and power
distribution.

Pipe Freeze Protection
and Flow Maintenance

System Overview

Typical System
A typical system includes the following:

Roof and Gutter
De-Icing

• IceStop self-regulating heating cable
• Connection kits and accessories
• Control system
• Power distribution
Power Connection Kits

Splice Kits

Attachment Kits

Tee Kits

Gutter Sensor

Downspout Hanger Kit

End Seal Kit

Lighted End Seal

Heating Cable

Surface Snow
Melting – MI

Power Distribution Panel

Surface Snow
Melting – ElectroMelt

Snow Controller

Freezer Frost
Heave Prevention

APS
Sno
w/I

-4

ltin
g Con
tro

ller

SUP
HEA PLY
USE TER :
ONL : 377277
VAC
Y COP VAC
,
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INS FIC CONAMP Z,
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A
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RES
ION ACI
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TRU
ING
CTI
ONS
DAN
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qua al voltaOF
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ELE
d ges
WAR
requpers areCTRICAL NIN
ired onn pres
G
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nergMor eath OR
ize e than thisELCTRO
this one cove
cont disc r. CUT
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icee
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.

SUP

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ATE

GR
OU

ND
FAU
HE
LT
ATE
RES R CYC
ET
LE
T GR
OU
ND
TES

FAU

HO
LD

TIM

E (HR
S)

Floor Heating

Fig. 1 Typical IceStop roof and gutter de-icing system

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Roof and Gutter De-icing — IceStop System
Self-Regulating Heating Cable Construction
Raychem IceStop self-regulating heating cables are comprised of two parallel
nickel-coated bus wires in a cross-linked polymer core, a tinned copper braid and a
fluoropolymer or polyolefin outer jacket. These cables are cut to length simplifying
the application design and installation.
Fluoropolymer (-XT) or
modified polyolefin (-X) outer jacket
Tinned-copper braid
Modified polyolefin inner jacket
Self-regulating conductive core
Nickel-plated copper bus wire

Fig. 2 IceStop heating cable construction

With self-regulating technology, the number of electrical paths between bus wires
changes in response to temperature fluctuations. As the temperature surrounding
the heater decreases, the conductive core contracts microscopically. This contraction
decreases electrical resistance and creates numerous electrical paths between the
bus wires. Current flows across these paths to warm the core.
As the temperature rises, the core expands microscopically. This expansion
increases electrical resistance and the number of electrical paths decreases. The
heating cable automatically begins to reduce its output.
At high temperature,
there are few conducting
paths and output is
correspondingly lower,
conserving energy
during operation.

re
g
Se

Temperature

Power

Constant wattage

lf-

At moderate temperature,
there are fewer conducting
paths because the heating
cable efficiently adjusts by
decreasing output, eliminating
any possibility of overheating.

Resistance

At low temperature,
there are many conducting paths, resulting in
high output and rapid
heat-up. Heat is
generated only when it is
needed and precisely
where it is needed.

Constant wattage

lf-

re
g

ing

Temperature

Fig. 3 Self-regulating heating cable technology

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THERMAL MANAGEMENT SOLUTIONS

Approvals
The IceStop roof and gutter de-icing system is UL Listed, CSA Certified, and FM
Approved for use in nonhazardous locations. GM-1XT and GM-2XT are FM Approved
for use in Class I, Division 2 hazardous locations.

Pipe Freeze Protection
and Flow Maintenance

Roof and Gutter De-Icing Design

Fire Sprinkler System
Freeze Protection

-ws

Roof and Gutter
De-Icing

Roof and Gutter De-Icing Design
This section details the design steps necessary to design your application. The
example provided in each step is intended to incrementally illustrate the project
parameter output for a sample design from start to finish. As you go through each
step, use the “IceStop System Roof and Gutter De-Icing Design Worksheet” on
page 120, to document your project parameters, so that by the end of this section,
you will have the information you need for your Bill of Materials.

Surface Snow
Melting – MI

Design Step by Step

 Determine design conditions
 Select the heating cable
 Determine the heating cable length
 Determine the electrical parameters
 Select the connection kits

Surface Snow
Melting – ElectroMelt

 Select attachment accessories and method
 Select the control system and power distribution
 Complete the Bill of Materials

Freezer Frost
Heave Prevention
Floor Heating

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Roof and Gutter De-icing — IceStop System
Roof and Gutter
De-Icing
1. Determine design
conditions
2. Select the heating
cable
3. Determine the
heating cable length
4. Determine the
electrical parameters
5. Select the
connection kits
6. Select attachment
accessories and
method
7. Select the control
system and power
distribution
8. Complete the Bill
of Materials

Step 1 Determine design conditions
Collect the following information to determine your design conditions:
• Type of roof
• Layout
–– Roof edge
–– Eave overhang
–– Gutters
- Length
- Depth
- Width
–– Roof valley
–– Roof/wall intersections
–– Downspouts
• Supply voltage
• Minimum start-up temperature
• Control method
Prepare Scale Drawing

Draw to scale the roof of the building noting roof valleys, different roof levels
and gutter and downspout locations. Note rating and location of voltage supply.
Measurements for each distinct section of the roof system, the gutters and
the downspouts, will allow for an accurate systems design, including control
configuration.
Example: Roof and Gutter De-Icing System
Type of roof

Sloped roof – standard with wood shingles and
gutters

Layout

Roof edge

50 ft (15.2 m) x 2 roof edges = 100 ft (30.5 m)

Eave overhang

24 inch (60 cm)

Gutters

2 gutters

Length

50 ft (15.2 m) x 2 roof edges = 100 ft (30.5 m)

Depth

6 in (15 cm)

Width

4 in (11 cm)

Roof valley

20 ft (6.1 m)

Downspouts

12 ft (3.7 m) x 2 downspouts = 24 ft (7.4 m)

Supply voltage

208 V

Minimum start-up temperature

20°F (–7°C)

Control method

Automatic controller

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THERMAL MANAGEMENT SOLUTIONS

Roof and Gutter
De-Icing

Step 2 Select the heating cable

1. Determine design
conditions

3. Determine the
heating cable length
4. Determine the
electrical parameters
5. Select the
connection kits

Heating Cable Catalog Number

Before beginning, take a moment to understand the structure underlying the heating
cable catalog numbers. You will refer to this numbering convention throughout the
product selection process. Select the appropriate heating cable catalog number
based on the voltage and outer jacket, as indicated below.

6. Select attachment
accessories and
method

8. Complete the Bill
of Materials

GM — 1 or 2

-X or -XT

Roof and Gutter
De-Icing

7. Select the control
system and power
distribution

Catalog number:

Product family
Voltage

Fire Sprinkler System
Freeze Protection

2. Select the heating
cable

To select the appropriate IceStop heating cable for your application, use the supply
voltage from Step 1, and select the appropriate outer jacket material. Once you
select these, you will be able to determine the catalog number for your cable.

Pipe Freeze Protection
and Flow Maintenance

Roof and Gutter De-Icing Design

1 = 120 V
2 = 208–277 V

Jacket type: Polyolefin
or
Fluoropolymer
Fig. 4 Heating cable catalog number
Surface Snow
Melting – MI

Select Heating Cable Supply Voltage

Select the heating cable supply voltage. Note that a higher supply voltage will allow
for longer circuit lengths. Supply voltage options include:
1 = 120 V
2 = 208–277 V
Evaluate heating cable specifications

Surface Snow
Melting – ElectroMelt

Use the following table to evaluate heating cable specifications that describe some
important aspects of the heating cable.
Table 1 IceStop Self-Regulating Heating Cable Specifications
Power output (nominal)

12 W/ft (39 W/m) in ice or snow

Minimum installation temperature

0°F (–18°C)

Minimum bend radius

5/8 in (16 mm)

Select the appropriate heating cable outer jacket for the application. Jacket options
include:
-X A polyolefin outer jacket (-X) is more economical for less demanding
applications.
-XT A fluoropolymer outer jacket (-XT) provides maximum abrasion, chemical,
and mechanical resistance.

Freezer Frost
Heave Prevention

Select Outer Jacket

Example: Roof and Gutter De-Icing System
208 V (from Step 1)

Catalog number

GM-2XT

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Technical Data
Sheets

EN-RaychemIceStopRoofGutterDeIcing-DG-H56070

Floor Heating

THERMAL MANAGEMENT SOLUTIONS

Supply voltage

Step 3 Determine the heating cable length
To determine the required heating cable length for your application, you will need to
determine the heating cable layout for each roof and gutter section that requires ice
protection. Detailed sketches of the building from Step 1 can ensure each area
and level is accounted for. The following guide will help determine length of cable
required for a variety of roof types and sections. For applications not covered in this
section, please contact Pentair Thermal Management for assistance.
Heating cable layout depends primarily on the roof type and its related roof features.
The following sections show typical layouts on standard roof types

6. Select attachment
accessories and
method

Table 2 Roof Types and Areas

7. Select the control
system and power
distribution

Roof type

Page

Sloped roof – standard

page 95

Sloped roof – standing seam

page 96

Flat roof

page 97

Sloped roof without gutters

page 98

8. Complete the Bill
of Materials

Roof features
Roof valley

page 99

Roof/wall intersections

page 99

Gutters

page 100

Downspouts

page 101

Important: For optimum performance, the heating cable should be in contact
with snow or ice. Installing the heating cable under the roofing or the roofing
materials will reduce the efficiency of the heating system. Please contact Pentair
Thermal Management for assistance.
Fig. 5 and Fig. 6 below illustrate several important terms:

Tracing
height

Downspout
hanger

Clips

Tracing
width

Fig. 5 Front view of roof with IceStop system
Roof
12" (30 cm)
Area where ice dams are
most likely to form
Heating cable
Heated
area

Gutter
Eave overhang
Exterior wall

Fig. 6 Side view of roof with IceStop system

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THERMAL MANAGEMENT SOLUTIONS

Sloped Roof — Standard

Roof and Gutter
De-Icing

(6
2'

Fire Sprinkler System
Freeze Protection

For sloped roofs, ice dams may form at the roof edge. To maintain a continuous
path for melt water runoff, route the heating cable in a zig-zag pattern as shown
in Fig. 7 and follow the appropriate attachment recommendations in “Step 6 Select
attachment accessories and method” on page 107. Additional heating cable may be
needed for other gutters, downspouts, and valleys.

Pipe Freeze Protection
and Flow Maintenance

Roof and Gutter De-Icing Design

Fig. 7 Layout in a zig-zag pattern

• Install the heating cable on the roof in a zig-zag pattern as shown in Fig. 7.
Surface Snow
Melting – MI

• Run heating cable up the roof until it is 12 inches (30 cm) past the exterior wall
into the heated area (see Fig. 6 on page 94).
• Use Table 3 to determine how much heating cable to use per foot of roof edge.
This will determine how much heating cable you need to trace on the roof. Additional heating cable will be needed for gutters, downspouts, and component
connections.
Table 3 IceStop Heating Cable Length for Sloped Roof – Standard

Tracing width

Feet of heating Meters of heating
cable per foot cable per meter
Tracing height of roof edge
of roof edge

2 ft

(60 cm)

12 in (30 cm)

2.5 ft

2.5 m

12 in (30 cm)

2 ft

(60 cm)

24 in (60 cm)

3.1 ft

3.1 m

24 in (60 cm)

2 ft

(60 cm)

36 in (90 cm)

4.2 ft

4.2 m

36 in (90 cm)

2 ft

(60 cm)

48 in (120 cm)

5.2 ft

5.2 m

For roofs with gutters, heating cable must be run to the bottom of the gutter. You
can determine the amount of extra heating cable required by adding twice the gutter
depth per foot of roof edge to the amount determined in Table 3.

Freezer Frost
Heave Prevention

For roofs without gutters, add 6 inches of heating cable per foot of roof edge (0.5
meters of heating cable per meter of roof edge) to allow for a 2–3 inch (5–8 cm) drip
loop to hang off the roof edge as shown in Fig. 10 on page 98.

Surface Snow
Melting – ElectroMelt

Eave
overhang
distance

For example, for a 6 inch deep gutter, add 1 foot of heating cable per foot of roof edge
to the amount determined using Table 3.
Floor Heating

Additional heating cable must be run along the bottom of the gutter. See “Gutters”
on page 100.
Note: Attachment methods are not shown in Fig. 7. For attachment methods,
proceed to “Step 6 Select attachment accessories and method” on page 107.

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Roof and Gutter De-icing — IceStop System
Sloped Roof — Standing Seam

For sloped standing-seam metal roofs, ice dams may form at the roof edge. To
maintain a continuous path for melt water to run off, route the heating cable along
the seams as shown in Fig. 8 and follow the attachment recommendations in “Step 6
Select attachment accessories and method” on page 107. Additional heating cable
may be needed for gutters, downspouts, and valleys.

Fig. 8 Layout on a standing seam roof

• Run the heating cable up one side of the seam, loop it over to the other side, and
return it to the bottom of the gutter. Continue along the bottom of the gutter to
the third seam and repeat the process (Fig. 8 on page 96). If the seams are
more than 24 inches (60 cm) apart, trace every seam.
• Run the heating cable up the seam until it is 12 inches (30 cm) past the exterior
wall and into a heated area, Fig. 6 on page 94.
• If the roofing materials continue down the fascia, contact your local Pentair Thermal
Management representative or Pentair Thermal Management directly for design
assistance.
• If there are no gutters, refer to “Heated Drip Edges” on page 112, for information
on how to install heating cable for this application.
Table 4 IceStop Heating Cable Length for Sloped Roof –
Standing Seam
Meters of
Feet of heating heating cable
Eave overhang Standing seam
cable per foot per meter of
distance
spacing
Tracing height of roof edge
roof edge
12 in (30 cm)

18 in (45 cm)

24 in (60 cm)

2.8 ft

2.8 m

24 in (60 cm)

18 in (45 cm)

36 in (90 cm)

3.6 ft

3.6 m

36 in (90 cm)

18 in (45 cm)

48 in (120 cm)

4.3 ft

4.3 m

12 in (30 cm)

24 in (60 cm)

2.4 ft

2.4 m

24 in (60 cm)

36 in (90 cm)

2.9 ft

2.9 m

36 in (90 cm)

24 in (60 cm)

48 in (120 cm)

3.6 ft

3.6 m

For standing seam roofs without gutters, add 6 inches (0.1 meter) of heating cable
for each seam traced to allow for a 2–3 inch (5–8 cm) drip loop to hang off the roof
edge as shown in Fig. 10.
For standing seam roofs with gutters, heating cable must be run to the bottom of the
gutter. You can determine the amount of extra heating cable required by adding twice
the gutter depth per seam traced to the amount determined in Table 4.
Additional heating cable will be needed for component connections and downspouts.
Note: Attachment methods are not shown in Fig. 8. For attachment methods,
proceed to “Step 6 Select attachment accessories and method” on page 107.

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THERMAL MANAGEMENT SOLUTIONS

Flat Roof

Slope

Fire Sprinkler System
Freeze Protection

Ice dams may occur on flat roofs at the edge flashing and at drains. Flat roofs are
typically pitched toward drains and these paths often become obstructed by snow
and ice. To maintain a continuous path for melt water to run off, route the heating
cable as shown in Fig. 9 and follow the appropriate attachment recommendations
in “Step 6 Select attachment accessories and method” on page 107. Additional
heating cable may be needed for downspouts.

Pipe Freeze Protection
and Flow Maintenance

Roof and Gutter De-Icing Design

Drain

Roof and Gutter
De-Icing

Heating cable should be positioned around
the perimeter and in the valleys of a flat roof.
The heating cable must extend into the drain or
scupper to allow the melt water to exit the roof.
Cable
Junction
end seal box

Surface Snow
Melting – MI

Drip loop

Surface Snow
Melting – ElectroMelt

Scupper
Heating cable provides a
continuous heated path to
allow melt water to run off
the roof before it refreezes.

Ice can form around
drain and at roof edges
where adjacent snow
thaws during the day
and refreezes at night.

Freezer Frost
Heave Prevention

Fig. 9 Layout on a flat roof

• Place heating cable around perimeter.
• Trace valleys from perimeter to drain.

• External downspouts and scuppers must be treated carefully. A path must be provided for the valley/perimeter heating cable to the point of discharge (see Fig. 17
on page 101).
• To avoid damage, do not walk on the heating cable.

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Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating

• Extend heating cable into internal downspouts at least 12 inches (30 cm) into
heated space.

Roof and Gutter De-icing — IceStop System
Sloped Roof without Gutters

When gutters are not used on a building, ice dams may form at the roof edge. To
maintain a continuous path for melt water to run off, a drip loop or heated drip edge
may be used. Drip loops and drip edges allow water to drip free of the roof edge.
Route the heating cable as shown in Fig. 10 or Fig. 11 below and follow the
appropriate attachment recommendations in “Step 4 Determine the electrical
parameters” on page 102. Additional heating cable may be needed for valleys.

2"–3"
(5–8 cm)

Fig. 10 Layout for heated drip loops

IceStop
heating
cable

Fig. 11 Layout for heated drip edge

Note: Attachment methods are not shown in the above illustrations. For
attachment methods, proceed to “Step 6 Select attachment accessories and
method” on page 107.
Other Considerations

• Ice will build up on the surfaces below the drip loop or drip edge if gutters are not
used.
• Ice may also build up on the vertical surfaces if there isn’t a sufficient overhang or
if there is a strong wind. Using a gutter system will prevent this ice buildup.

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THERMAL MANAGEMENT SOLUTIONS

Roof Valleys

1/3

Fire Sprinkler System
Freeze Protection

Ice dams may form at the valley on a roof where two different slopes meet. To
maintain a continuous path for melt water, run the heating cable up and down the
valley as shown in Fig. 12 and follow the appropriate attachment recommendations
in “Step 6 Select attachment accessories and method” on page 107. Additional
heating cable may be needed for the roof surface, gutters, and downspouts.

Pipe Freeze Protection
and Flow Maintenance

Roof and Gutter De-Icing Design

Roof and Gutter
De-Icing

2/3

Fig. 12 Layout for a roof valley

• The heating cable must extend into the gutter. If you don’t have gutters, the heating cable should extend over the edge 2 to 3 inches (5 to 8 cm) to form a drip loop.

Surface Snow
Melting – MI

• Trace two-thirds of the way up each valley with a double run of heating cable (loop
up and back once).

• For attachment methods, proceed to “Step 6 Select attachment accessories and
method” on page 107.
Surface Snow
Melting – ElectroMelt

Roof/Wall Intersections

Roof/wall intersections can be treated in the same manner as valleys. Snow has
a tendency to collect at this interface. Providing a loop of heating cable two-thirds
of the way up the slope will provide a path for the extra melt water in this area to
escape.
1/3

Freezer Frost
Heave Prevention

2/3

2"–3"

Floor Heating

4"–6"

Fig. 13 Layout for a roof/wall intersection.

• Position the closest heating cable approximately 2 to 3 inches (5 to 8 cm) from the
wall. Position the second heating cable 4 to 6 inches (10 to 16 cm) from the first.
THERMAL MANAGEMENT SOLUTIONS

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Technical Data
Sheets

• Extend a loop of heating cable two-thirds of the way up the slope adjacent to the
wall.

Roof and Gutter De-icing — IceStop System
Gutters

Ice may accumulate in gutters and at the roof edge. To maintain a continuous
path for melt water to run off, route the heating cable as shown in Fig. 14 below.
Additional heating cable may be needed for the roof surface, downspouts, and
valleys.

Fig. 14 Layout in standard gutters — up to 6" (16 cm) wide

• Use one run of heating cable in the gutter.
• No attachment to gutter is normally required. If attachment is desired, use a roof
clip such as a Raychem GMK-RC clip.
• Continue heating cable down the inside of the downspout. See “Downspouts,”
page 101, for more information.
In wide gutters, snow and ice can bridge over the tunnel created by a single
heating cable and prevent melt water from getting into the gutter and downspouts.
To maintain a continuous path for melt water to run off, run the heating cable
in the gutter as shown in Fig. 15 below and follow the appropriate attachment
recommendations in “Step 6 Select attachment accessories and method” on
page 107. Additional heating cable may be needed for the roof surface, downspouts,
and valleys.

GM-RAKE

6" (15 cm) spacing
maximum
GMK-RC

Fig. 15 Layout in wide gutters — 6" to 12" (16 to 31 cm) wide

• Use two parallel runs of heating cable. Separate the two runs of heating cable
with a pair of GMK-RC clips or a single GM-RAKE downspout hanger bracket.
• No attachment to the gutter is normally required. If attachment is desired, use a
GMK-RC with appropriate adhesive.
• Continue heating cable down the inside of the downspout. See “Downspouts,”
page 101 for more information.

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THERMAL MANAGEMENT SOLUTIONS

Downspouts

Roof and Gutter
De-Icing

Fig. 16 Heating cable at top of downspout

Surface Snow
Melting – MI

12"

Accumulated ice
can be removed.

Accumulated ice
may block drains.

Fig. 17 Heating cable at bottom of downspout

• If the downspout ends underground, the heating cable should extend into a
heated area or below the frost line.

• Leave drip loops below the downspout at bottom.
• If a single run of heating cable is used, the end seal should be looped back up at
least 12 inches (30 cm) inside the downspout.

Freezer Frost
Heave Prevention

• For low water-flow situations, teeing the heating cable so that a single run goes
down the downspout is usually sufficient. For high water-flow situations, where
ambient temperatures often fall below –10°F (–23°C), or where it isn’t convenient
to tee the heating cable, use two runs by running the heating cable down to the
bottom and then back to the top.

Surface Snow
Melting – ElectroMelt

Drain removes melt water
below the frost line.

Fire Sprinkler System
Freeze Protection

Ice may form in downspouts and prevent melt water from escaping from the roof. To
maintain a continuous path for melt water to run off, run the heating cable inside the
downspout to the end as shown in Fig. 16 and Fig. 17 below. Follow the appropriate
attachment recommendations in “Step 6 Select attachment accessories and
method” on page 107. Additional heating cable may be needed for the roof surface,
gutters, and valleys.

Pipe Freeze Protection
and Flow Maintenance

Roof and Gutter De-Icing Design

• If the downspout ends near the ground, water will refreeze on the ground and
build up around the downspout, eventually blocking the opening.

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101

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating

WARNING: To prevent mechanical damage, do not leave the end seal exposed
at the end of the downspout.

Roof and Gutter De-icing — IceStop System
Example: Roof and Gutter De-Icing System
Type of roof

Sloped roof – standard with wood shingles and gutters
(from 1)

Layout
Roof edge

100 ft (30.5 m) (from Step 1)

Eave overhang

24 inch (60 cm) (from Step 1)
Requires 4.2 ft of heating cable per foot of roof edge
(4.2 m per meter of roof edge). See Table 2.

Gutters
Length

100 ft (30.5 m) (from Step 1)

= 100 ft (30.5 m) heating cable

Depth

6 in (11 cm) x 2 (from Step 1)
= 1 foot of additional heating cable 4.2 ft + 1 ft = 5.2 ft x 100 ft

= 520 ft (158.5 m) heating cable

Width

4 in (from Step 1)
therefore single run of heating cable at indicated gutter length

Roof valley

20 ft (6.1 m) (from Step 1) x 1.33 = 26.6
= rounded to 27 ft (8.3 m) heating cable

Downspouts

Two 12 ft (3.7 m) (from Step 1)
= 26 ft (8.0 m) heating cable

(Single runs in each downspout with 1 ft (0.3 m) loop back
from bottom)
Total heating cable length 673 ft (205.2 m)
Additional heating cable will be required for connection kits. After determining kit
requirements, heating cable allowances for each will be added to total heating cable
length for Bill of Materials.
Roof and Gutter
De-Icing
1. Determine design
conditions
2. Select the heating
cable
3. Determine the
heating cable length
4. Determine the
electrical parameters
5. Select the
connection kits
6. Select attachment
accessories and
method
7. Select the control
system and power
distribution

Step 4 Determine the electrical parameters
This section will help you determine the electrical parameters for an IceStop system
including circuit breaker sizing and maximum circuit length. Total required heating
cable length divided by maximum heating cable circuit length will determine the
number of circuits required for your snow melting solution.
DETERMINE MAXIMUM CIRCUIT LENGTH

To determine maximum circuit length, it is important to establish a minimum startup
temperature for the system. Table 5 provides maximum circuit lengths based on
minimum startup temperature, circuit breaker rating and supply voltage. Colder
temperature startup requires shorter maximum circuit lengths. The use of an
automatic system, which energizes the system above 20°F (–7°C), ensures that you
can use maximum circuit lengths. Manual control systems may require you to use
shorter circuit lengths to compensate for startup below 20°F (–7°C).

8. Complete the Bill
of Materials

102

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THERMAL MANAGEMENT SOLUTIONS

Table 5 Maximum Circuit Length in Feet (Meters)
Heating cable
GM-1X and -1XT at 120 V

GM-2X and -2XT at 240 V

15 A

20 A

30 A

40 A 1
–

Max.
A/ft (A/m)

32°F (0°C)

100

(30)

135 (41)

200 (61)

20°F (–7°C)

(29)

125 (38)

185 (56)

200 (61)

0.126 (0.414)

0°F (–18°C)

(24)

100 (30)

155 (47)

200 (61)

0.150 (0.492)

32°F (0°C)

190

(58)

250 (76)

380 (116)

20°F (–7°C)

180

(55)

235 (72)

355 (108)

380 (116)

0.067 (0.220)

0°F (–18°C)

145

(44)

195 (59)

290 (88)

380 (116)

0.083 (0.272)

32°F (0°C)

200

(61)

265 (81)

400 (122)

20°F (–7°C)

190

(58)

250 (76)

370 (113)

400 (122)

0.063 (0.207)

0°F (–18°C)

155

(47)

205 (62)

305 (93)

400 (122)

0.077 (0.253)

32°F (0°C)

215

(66)

290 (88)

415 (126)

20°F (–7°C)

200

(61)

265 (81)

400 (122)

415 (126)

0.060 (0.197)

0°F (–18°C)

165

(50)

225 (69)

330 (101)

415 (126)

0.073 (0.240)

–

0.120 (0.394)

0.063 (0.207)

0.060 (0.197)

0.056 (0.184)

1 Only FTC-P power connection, FTC-HST splice/tee, and RayClic-E end kits may be used with 40-A circuits.

Example: Roof and Gutter De-Icing System
20°F (–7°C) (from Step 1)

Circuit breakers

30 A

Supply voltage

208 V (from Step 1)

Maximum circuit length

355 ft (108 m) (from Table 5)

Freezer Frost
Heave Prevention

Startup temperature

Determine number of circuits

Use the following formula to determine number of circuits for the system:
Number of circuits =

Surface Snow
Melting – ElectroMelt

Surface Snow
Melting – MI

GM-2X and -2XT at 277 V

Circuit breaker size

Roof and Gutter
De-Icing

GM-2X and -2XT at 208 V

Start-up
temperature

Fire Sprinkler System
Freeze Protection

Select the smallest appropriate circuit breaker size. A 30-mA ground-fault protection
device (GFPD) must be used to provide protection from arcing or fire, and to comply
with warranty requirements, agency certifications, and national electrical codes. If
the heating cable is improperly installed, or physically damaged, sustained arcing
or fire could result. If arcing does occur, the fault current may be too low to trip
conventional circuit breakers.

Pipe Freeze Protection
and Flow Maintenance

Roof and Gutter De-Icing Design

Heating cable length required
Maximum heating cable circuit length

Example: Roof and Gutter De-Icing System
673 ft (205.2 m) (from Step 3)

Maximum circuit length

355 ft (108 m) (from above)

Number of circuits

673 ft / 355 ft = 1.9 rounded to 2 circuits

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103

Technical Data
Sheets

EN-RaychemIceStopRoofGutterDeIcing-DG-H56070

Floor Heating

THERMAL MANAGEMENT SOLUTIONS

Total heating cable length

Roof and Gutter De-icing — IceStop System
Determine Transformer load

The total transformer load is the sum of load on all the circuit breakers in the
system.
Calculate the Circuit Breaker Load (CBL) as:

CBL (kW) =

Circuit breaker rating (A) x 0.8 x Supply voltage
___________________________________________________
1000

If the CBL is equal on all circuit breakers, calculate the Total Transformer Load as
follows:
Total Transformer Load (kW) = CBL x Number of circuits
If the CBL is not equal on all circuit breakers, calculate the Total Transformer Load
as follows:
Total Transformer Load (kW) = CBL1 + CBL2 + CBL3...+ CBLn
Example: Roof and Gutter De-Icing System

Roof and Gutter
De-Icing
1. Determine design
conditions
2. Select the heating
cable
3. Determine the
heating cable length
4. Determine the
electrical parameters
5. Select the
connection kits
6. Select attachment
accessories and
method
7. Select the control
system and power
distribution
8. Complete the Bill
of Materials

104

Circuit breaker load (CBL)

= (30 A x 0.8 x 208 V) / 1000 = 5 kW

Total transformer load

= 5 kW x 2 circuits = 10 kW

Step 5 Select the connection kits
A typical IceStop system may have several connection kits to seal and power the
heating cable. The connection kits work together with the IceStop heating cable to
provide a safe and reliable de-icing system that is easy to install and maintain. The
available accessories are listed in Table 6. A complete IceStop system also consists
of attachment accessories and adhesives which we discuss later in “Step 6 Select
attachment accessories and method” on page 107.
The self-regulating IceStop heating cable is cut to length at the job site. In order to
seal the heating cable from the environment and provide power, Pentair Thermal
Management approved connection kits must be used. A power connection kit is
required to attach power to one end of the heating cable. An end seal is required, and
is provided with each power connection to seal the other end. Splice and tee kits are
also available to connect two or three heating cables together.
RayClic and FTC connection kits are available for the IceStop system. The RayClic
connection kits are insulation-displacement quick connect systems. The FTC
connection kits use heat-shrinkable tubing and crimp barrels. All of these
connection kits are outlined in Table 6 below. Additional heating cable will be
required to allow for connection kit assembly and drip loops.

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THERMAL MANAGEMENT SOLUTIONS

Table 6 Connection Kits
Catalog
number

Description

Standard
packaging

Usage

Heating cable
allowance 1

Power connection and end seal
(RayClic-SB-04 pipe mounting
bracket included)

1 per circuit

2 ft (0.6 m)

RayClic-PS

Powered splice and end seal
(RayClic-SB-04 pipe mounting
bracket included)

1 per circuit

4 ft (1.2 m)

RayClic-PT

Powered tee and end seal
(RayClic-SB-04 pipe mounting
bracket included)

1 per circuit

6 ft (1.8 m)

FTC-P2

Power connection and end seal

1 per circuit

2 ft (0.6 m)

Roof and Gutter
De-Icing

RayClic-PC

Fire Sprinkler System
Freeze Protection

Connection kits

Pipe Freeze Protection
and Flow Maintenance

Roof and Gutter De-Icing Design

Note: FTC-P is required for
circuits requiring 40 A circuit
breakers.
As required

2 ft (0.6 m)

RayClic-T

Tee kit with end seal

As required

3 ft (0.9 m)

RayClic-X

Cross connection to connect
four heating cables

As required

8 ft (2.4 m)

FTC-HST3

Low-profile splice/tee

As required

2 ft (0.6 m)

RayClic-LE

Lighted end seal
(RayClic-SB-04 pipe
mounting bracket included)

Alternate end seal

2 ft (0.6 m)

RayClic-E

Extra end seal

Additional end seal

0.3 ft (0.1 m)

Required for every
RayClic connection
kit

Freezer Frost
Heave Prevention

Surface Snow
Melting – ElectroMelt

Splice

Surface Snow
Melting – MI

RayClic-S

Accessories
Wall mounting bracket

–

Floor Heating

RayClic-SB-02

1 Additional heating cable required for connection kit assembly and drip loops.
2 Junction box not included.
3 One RayClic-E end seal is required for each FTC-HST used as a tee kit.

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Roof and Gutter De-icing — IceStop System
Example: Roof and Gutter De-Icing System
Connection kit

Quantity

Heating cable allowance

RayClic-PC

4 ft (1.2 m)

RayClic-PS

8 ft (2.4 m)

RayClic-SB-02

Determine how much additional heating cable you need for the connection kits.
Example: Roof and Gutter De-Icing System

106

Sloped roof – standard

520 ft (158.5 m)

Gutters

100 ft (30.5 m)

Roof valley

27 ft (8.3 m)

Downspouts

26 ft (8.0 m)

Total heating cable allowance for connection kits

12 ft (4.0 m)

Total heating cable length required

685 ft (208.8 m)

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Roof and Gutter
De-Icing

Step 6 Select attachment accessories and method

2. Select the heating
cable
3. Determine the
heating cable length

Always check with the roofing manufacturer for recommendations on how to
attaching heating cables to their roofing material.

4. Determine the
electrical parameters
5. Select the
connection kits

Roof and Gutter
De-Icing

6. Select attachment
accessories and
method

Fire Sprinkler System
Freeze Protection

A typical IceStop system also consists of various attachment accessories and
adhesives for attaching the heating cable to the roof. The available accessories are
listed in Table 7he adhesives in Table 9. The type of attachment accessories you need
will depend on the type of roof you have. See Table 8 for details.

1. Determine design
conditions

Pipe Freeze Protection
and Flow Maintenance

Roof and Gutter De-Icing Design

7. Select the control
system and power
distribution
8. Complete the Bill
of Materials

Description

Standard
packaging

Heating cable
allowance

GMK-RC

Roof clips

50/box

1 box per 35' of roof edge when
zig-zag layout is used.
See Table 8 for other layout
options.

–

GMK-RAKE

Hanger bracket

1 hanger per cable in downspout or as required for mechanical protection.
See Table 8 for other layout
options.

–

CT-CABLE-TIE

UV-resistant cable tie

100/box

As required.

–

Usage

Surface Snow
Melting – ElectroMelt

Catalog
number

Surface Snow
Melting – MI

Table 7 Attachment Accessories

Freezer Frost
Heave Prevention
Floor Heating

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Roof and Gutter De-icing — IceStop System
Heating cable attachment depends primarily upon the roof type. The following table
shows the recommended attachment methods for typical roof materials and roof
areas.
Table 8 Attachment Methods for Typical Roofs
Recommended
attachment method

Roof material

Alternate attachment
method

Shake/shingle

“Mechanical Attachment,”
page 109

Rubber/membrane

“Belt Loop Approach,” page 110 “Adhesive Attachment,”
page 109

Metal

“Mechanical Attachment,”
page 109

Wood

“Mechanical Attachment,”
page 109

Other

“Attachment Methods for Other
Areas,” page 111

Area

Attachment method

Gutters

Recommend using hanger clips
glued to gutter for security if
possible (see page 111)

Downspouts

Downspout hangers (page 111)

Drip edges

Attached to a flat sheet or
standard drip edge, or installed
informed sheet metal (see
page 112)

Component locations

Drip loops

Roof edges with
no gutter

Drip loops

“Adhesive Attachment,”
page 109
“Belt Loop Approach,”
page 110

Note: Do not use adhesives on slate or tile roofs. Please contact roofing manufacturer
for a recommended attachment method or contact your Pentair Thermal Management
representative.
Adhesive is not supplied by Pentair Thermal Management. Follow manufacturer’s
instructions for surface preparation and installation.
Table 9 Adhesives
Adhesive

Description

Color

Approximate Cure
tooling time time

Dispensing
equipment

Momentive
Performance
Materials, Inc.
RTV167

Neutral-cure
silicone adhesive

Gray

20 minutes

48 hours Caulking gun

SpeedBonder®
H3300

Methacrylate
adhesive

Tan

15 minutes

24 hours 2 part mixing
dispenser

SpeedBonder
H4800

Methacrylate
adhesive

Light
yellow

45 minutes

24 hours 2 part mixing
dispenser

Plexus® MA300

Methacrylate
adhesive

Yellow

15 minutes

16 hours 2 part mixing
dispenser

Plexus MA310

Methacrylate
adhesive

Yellow

30 minutes

16 hours 2 part mixing
dispenser

Note: Before using adhesives on metal roofs check with the roofing manufacturer.
Trademarks are the property of their respective owners.

108

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Roof Attachment Methods

Mechanical Attachment

Fire Sprinkler System
Freeze Protection

One of the most common attachment methods is to use Raychem GMK-RC roof
clips. It can be used on all surfaces where nails or screws are acceptable.

Pipe Freeze Protection
and Flow Maintenance

Roof and Gutter De-Icing Design

Roof and Gutter
De-Icing

Fig. 18 GMK-RC clip attachment

• One box of 50 GMK-RC roof clips is sufficient to attach the heating cable on 35
feet (9.1 m) of roof edge using a zig-zag layout. Your layout may require additional
clips.
• For layouts other than the standard zig-zag, use one clip for each 5 to 10 feet (1.5
to 3 m) of unsupported heating cable and at every change of heating cable direction.

• For standing-seam roofs, the heating cable should be cable-tied together at the
bottom of the seam.
• For high wind areas, it is recommended to use a UV resistant cable tie to further
secure the heating cable to the attachment clip.
Adhesive Attachment

Surface Snow
Melting – ElectroMelt

• For standard sloped roofs, the loops of heating cable being zig-zag on the roof
should be attached using a UV-resistant cable tie to the heating cable run in the
gutter.

Surface Snow
Melting – MI

• The GMK-RC roof clips are used to secure IceStop heating cable. This
multipurpose bracket attaches with a screw, nail, or adhesive to many types of
roofs and gutters.

For roofs where penetrating attachments are not desired, use the GMK-RC roof clip
attached by adhesive.
Freezer Frost
Heave Prevention
Floor Heating

Fig. 19 GMK-RC clip on standing-seam roof

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Roof and Gutter De-icing — IceStop System

Fig. 20 GMK-RC clip on flat roof

• The GMK-RC roof clips are used to secure IceStop heating cable. The clip
attaches with adhesive (not supplied by Pentair Thermal Management) to many
types of roofs and gutters.
• Several different adhesives are recommended by Pentair Thermal Management.
See Table 9 on page 108 or contact Pentair Thermal Management for alternatives.
• On a standing seam roof, use four clips on each seam being traced. On a flat surface, use one clip for every 5 to 10 feet (1.5 to 3 m) of unsupported heating cable
and at every change of direction.
• Follow all recommendations from the adhesive manufacturer with regard to
cleaning and preparing the roof surface for the adhesive.
Belt Loop Approach
With the belt loop approach, strips of roofing materials are fastened to the roof using
standard means for that particular type of roof. The heating cable is attached with a
UV‑resistant cable tie to the loop formed by this material.

Strip of roof
material
Roof
adhesive

Heating
cable

Cable tie

Fig. 21 Belt loop approach on a sloped roof

Fig. 22 Belt loop approach on a flat roof

110

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• The belt loop method of securing the IceStop heating cable involves using a small
piece of roofing material to form a “belt loop.”
• Use at least one belt loop for every 5 to 10 feet (1.5 to 3 m) of unsupported heating
cable and at every heating cable change of direction.

Gutters
Attachment is not generally required for standard gutters. If attachment is desired,
such as in high-wind areas, use GMK-RC adhesive-mounted attachment clips.
Several different adhesives are recommended by Pentair Thermal Management. See
Table 9 on page 108.

Roof and Gutter
De-Icing

For large gutters (6 to 12 inches wide [15 cm to 30 cm]), use two runs of heating
cable separated by GMK-RC roof clips. It is not necessary to attach the clips to the
gutter. Use one pair of GMK-RC roof clips for every 10 feet (3 m).

Fire Sprinkler System
Freeze Protection

Attachment Methods for Other Areas

Pipe Freeze Protection
and Flow Maintenance

Roof and Gutter De-Icing Design

GM-RAKE

Surface Snow
Melting – MI

6" (15 cm) spacing
maximum
GMK-RC

Downspouts
The IceStop heating cable needs to be attached at the top of each downspout, using
one GM‑RAKE downspout hanger per heating cable. The GM-RAKE downspout
hanger clamps around the heating cable and attaches to the fascia with a screw or
nail.

Surface Snow
Melting – ElectroMelt

Fig. 23 GMK-RC clip in a gutter

Freezer Frost
Heave Prevention

• GM-RAKE downspout hangers protect the heating cable from damage from sharp
edges and also provide support for the weight of the heating cable.
• Use two GM-RAKE downspout hangers for double-traced downspouts.

Floor Heating

Fig. 24 GM-RAKE downspout hangers

• Attach the GM-RAKE downspout hangers to the structure with a nail or other
suitable method.

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Roof and Gutter De-icing — IceStop System
Heated Drip Edges
When installing a heated drip edge, you can attach the heating cable to the roof’s
drip edge or to a flat sheet of sheet metal with a UV-resistant cable tie, or place the
heating cable in a formed (J-channel) piece of sheet metal.

Roofing material
Metal drip edge
IceStop heating cable
UV-resistant cable tie

Attached to flat sheet
UV-resistant cable tie

Attached to standard drip edge

2 3/4" (7 cm)
1/4" (0.6 cm) Installed in a formed sheet
3/4" (1.9 cm)

Fig. 25 Heated drip edge attachment guidelines

• The illustrations above are guidelines for heating cable attachment in a heated
drip edge application. Pentair Thermal Management does not manufacture drip
edge attachment clips.
• Use 20-gauge or thicker corrosion-resistant sheet metal.
• Contact your Pentair Thermal Management representative or Pentair Thermal
Management directly for specific recommendations.
Example: Roof and Gutter De-Icing System
100 ft (30.5 m) roof edge and 2 gutters

112

GMK-RC

3 boxes of 50

GM-RAKE

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Roof and Gutter
De-Icing

Step 7 Select the control system and power distribution

1. Determine design
conditions

3. Determine the
heating cable length
4. Determine the
electrical parameters
5. Select the
connection kits

7. Select the control
system and power
distribution
8. Complete the Bill
of Materials

• Manual on/off control
• Ambient thermostat
• Automatic moisture/temperature controller
All three methods require contactors if any significant length of heating cable is
being used. The contactor must be sized to carry the load. Each method offers
a trade-off of initial cost versus energy efficiency and ability to provide effective
de-icing. If the system is not energized when needed, ice will form. If the system
is energized when de-icing is not needed, there will be unnecessary power
consumption. Choose the control method that best meets the project performance
requirements. Contact your Pentair Thermal Management representative for details.
For Class I, Division 2 hazardous locations, use an agency-approved controller or
thermostat suitable for the same area use.

Roof and Gutter
De-Icing

6. Select attachment
accessories and
method

Three control methods are commonly used with roof de-icing systems:

Fire Sprinkler System
Freeze Protection

2. Select the heating
cable

Control Systems

Pipe Freeze Protection
and Flow Maintenance

Roof and Gutter De-Icing Design

Manual On/Off Control

Ambient Thermostat
When an ambient sensing thermostat is used, the roof and gutter system will be
energized when the ambient temperature is below freezing. This will ensure the
heating cable is energized any time the water might freeze.

Surface Snow
Melting – MI

A manually controlled system is operated by a switch that controls the system power
contactor. This method requires constant supervision to work effectively. A manual
system can be controlled by a building management system.

Table 10 ECW-GF Thermostat

Sensor

Thermistor

Sensor length

35 ft

Set point range

32°F to 200°F (0°C to 93°C)

Enclosure

NEMA 4X

Deadband

2°F to 10°F (2°C to 6°C)

Enclosure limits

–40°F to 140°F (–40°C to 60°C)

Switch rating

30 A

Switch type

DPST

Electrical rating

100−277 V

Approvals

c-UL-us Listed

Ground-fault protection

30 mA fixed

Alarm outputs
AC relay

2 A at 277 Vac
2 A at 48 Vdc

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Floor Heating

Dry contact relay

Freezer Frost
Heave Prevention

Single

Surface Snow
Melting – ElectroMelt

Number of heating cable
circuits

Roof and Gutter De-icing — IceStop System
Automatic Moisture/Temperature Controller
The most conservative approach from an energy-consumption point of view is an
automatic moisture/temperature sensor. Pentair Thermal Management supplies an
automatic moisture/temperature sensor, which consists of a control panel, one or
more gutter sensors, and one or more aerial snow sensors. Table 11 outlines the
options for this approach.
The gutter sensor should be mounted in gutters near downspouts. It senses the
actual environmental conditions, such as temperature and moisture. A gutter
sensor is recommended for each critical area that needs to be monitored for icing
conditions (such as when one side of a building gets sun in the morning and the
other side gets sun in the afternoon, or one side gets the prevailing winds and the
other side is protected). An aerial-mounted snow sensor is also recommended.
Having both gutter and snow sensors allows for snow to begin melting in the gutters
at the onset of any snow or ice condition.
For areas where a large number of circuits are required, the DigiTrace ACS-30
can be used. The Roof & Gutter De-icing control mode in the ACS-30 includes
an External Device control option. This option allows a Snow/Moisture sensing
controller (from Table 11) to be integrated into the ACS-30 system. Note that sensors
(snow or gutter) cannot be directly connected to the ACS-30 system. Refer to the
ACS-30 Programming Guide (H58692) for more information on system setup.
Table 11 Automatic Controllers
Application

APS-3C

APS-4C

SC-40C

PD Pro

GF Pro

Snow controller

Snow controller
with ground-fault
protection

Satellite contactor

Snow controller

Snow controller
with ground-fault
protection

Number of sensors

1 to 6

1 to 2

Set point

38°F (3°C) and
moisture

High limit
temperature set
point

40°F to 90°F (4°C to 40°F to 90°F (4°C to 40°F to 90°F (4°C to NA
32°C) adjustable
32°C) adjustable
32°C) adjustable

Enclosure

NEMA 3R

NEMA 4X

Temperature
operating limits

–40°F to 160°F
(–40°C to 71°C)

–31°F to 130°F
(–35°C to 55°C)

Electrical rating

24 A, 120 V
24 A, 208–240 V

50 A, 208–240 V
40 A, 277 V
50 A, 277–480 V
50 A, 600 V

50 A, 208/240 V
40 A, 277 V
50 A, 277–480 V
50 A, 600 V

30 A, 120 V

30 A, 208-277 V

Approvals

c-UL-us Listed

Ground-fault
protection

Not included

30 mA

30 mA, 60 mA and
120 mA

Not included

30 mA

Table 12 Moisture/Temperature Sensors
Application

Set point

114

GIT-1

CIT-1

Gutter-mounted
moisture/temperature

Aerial-mounted
moisture/temperature

38°F (3°C)

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Table 13 Control Systems
Catalog number

Description

Pipe Freeze Protection
and Flow Maintenance

Roof and Gutter De-Icing Design

Electronic Thermostats and Accessories
Electronic ambient sensing controller with 30-mA ground-fault protection. The controller can be programmed to maintain temperatures up to 200°F (93°C) at voltages from
100 to 277 V and can switch current up to 30 Amperes. The ECW-GF is complete with
a 25-ft (7.6-m) temperature sensor and is housed in a NEMA 4X rated enclosure. The
controller features an AC/DC dry alarm contact relay.
An optional ground-fault display panel (ECW-GF-DP) can be added to provide groundfault or alarm indication in applications where the controller is mounted in inaccessible
locations.
APS-3C

Automatic snow melting controller housed in a NEMA 3R enclosure provides effective,
economical automatic control of all snow melting applications. CSA Certified, c-UL-us
Listed, available in 120 V and 208-240 V, 50/60 Hz models, 24-Amp DPDT output relay,
adjustable hold-on timer.

Roof and Gutter
De-Icing

Snow Melting Controllers

Fire Sprinkler System
Freeze Protection

ECW-GF

Enclosure dimensions: 11-1/2 in x 9-1/8 in x 6-9/16 in (292 mm x 232 mm x 167 mm)

Automatic snow melting controller housed in a NEMA 3R enclosure provides effective,
economical automatic control of all snow melting applications. The APS-4C can
operate with any number of SC-40C satellite contactors for larger loads. Features
include: 277 V single-phase or 208–240, 277/480, and 600 V three-phase models,
built-in 3-pole contactor, integral 30 mA ground-fault circuit interrupter and an
adjustable hold-on timer.

Surface Snow
Melting – MI

APS-4C

Enclosure dimensions: 11-1/2 in x 9-1/8 in x 6-9/16 in (292 mm x 232 mm x 167 mm)
SC-40C

Enclosure dimensions: 11-1/2 in x 9-1/8 in x 6 in (292 mm x 232 mm x 152 mm)

Gutter De-Icing Controllers

ETI GF Pro

Automatic snow and ice melting controller for pavement, sidewalks, loading docks,
roofs, gutters and downspouts in commercial and residential environments.
The GF Pro interfaces with up to two sensors, (any combination of CIT-1, GIT-1 or SIT6E) to meet site requirements. The GF Pro is housed in an environmentally-sheltered
Type 4X enclosure and weighs only 3 pounds.

Features a built-in 30 mA, self-testing Ground-Fault Equipment Protection (GFEP)
capability, digitally filtered to minimize false tripping. A ground-fault alarm must be
manually reset using the Test/Reset switch before heater operation can continue.

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating

Automatic snow and ice melting controller for pavement, sidewalks, loading docks,
roofs, gutters and downspouts in commercial and residential environments.
The PD Pro interfaces with up to two sensors, (any combination of CIT-1, GIT-1 or SIT6E) to meet site requirements. The PD Pro is housed in an environmentally-sheltered
Type 4X enclosure and weighs only 3 pounds.

Freezer Frost
Heave Prevention

ETI PD Pro

Surface Snow
Melting – ElectroMelt

Satellite contactor power control peripheral for an APS-4C snow melting controller,
housed in a NEMA 3R enclosure. Features include: 277 V single-phase or 208–240,
277/480 and 600 V three-phase models, built-in 3-pole contactor and integral 30 mA
ground-fault circuit interrupter.

Roof and Gutter De-icing — IceStop System
Table 13 Control Systems
Catalog number

Description

Snow Melting and Gutter De-Icing Sensors and Accessories
CIT-1

Overhead snow sensor that detects precipitation or blowing snow at ambient temperatures below 38°F (3.3°C). For use with an APS-3C or APS-4C automatic snow
controller, or an SC-40C satellite contactor.

GIT-1

Gutter sensor that detects moisture at ambient temperatures below 38°F (3.3°C).
For use with an APS-3C or APS-4C automatic snow controller, or a SC-40C satellite
contactor.

RCU-3

The RCU–3 provides control and status display to the APS–3C controller from a
remote location. It has a 2, 4, 6 or 8 hour CYCLE TIME adjustment, independent of
APS-3C setting.

RCU-4

The RCU–4 provides control and status display to the APS–4C controller and SC-40C
Satellite Contactor from a remote location. It has a 2, 4, 6 or 8 hour CYCLE TIME
adjustment, independent of the APS-4C or SC-40C setting.

Electronic Controllers

A0
A1
A2
A3
A4
A5
A6
A7

ACS-UIT2
ACS-PCM2-5

The DigiTrace ACS-30 Advanced Commercial Control System is a multipoint electronic
control and monitoring system for heat-tracing used in various commercial applications such as pipe freeze protection, roof and gutter de-icing, surface snow melting,
hot water temperature maintenance and floor heating. The DigiTrace ACS-30 system
can control up to 260 circuits with multiple networked ACS-PCM2-5 panels, with a
single ACS-UIT2 user interface terminal. The ACS-PCM2-5 panel can directly control
up to 5 individual heat-tracing circuits using electro-mechanical relays rated at 30 A
up to 277 V.

ProtoNode-LER
ProtoNode-RER

The DigiTrace ProtoNode is an external, high performance multi-protocol gateway for
customers needing protocol translation between Building Management Systems (BMS)
and the DigiTrace ACS-30 or C910-485 controllers.

PROTOCESSOR
SERIAL ETHERNET

PROTONODE

B0
B1
B2
B3
S0
S1
S2
S3

By FieldServer Technologies
www.ProtoCessor.com

The ProtoNode-LER is for LonWorks® systems; and the ProtoNode-RER is for
BACnet® or Metasys® N2 systems.
RS 485 GND
RS 485 RS 485+

+PWR
- PWR
FRAME GND

RTD-200
RTD3CS
RTD10CS
RTD50CS

116

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Example: Roof and Gutter De-Icing System
208 V system with 2 circuits
1

SC-40C

GIT-1

2 (one for each gutter section)

CIT-1

Power Distribution

Once the heating cable circuits and control have been defined, you must select how
to provide power to them. Power to the IceStop heating cables can be provided in
several ways: directly through the controller, through external contactors, or through
SMPG power distribution panels.

Heating cable circuits that do not exceed the current rating of the selected control
device shown in Table 11 can be switched directly (see Fig. 26).
Group control

Roof and Gutter
De-Icing

Single circuit control

Fire Sprinkler System
Freeze Protection

APS-4C

Pipe Freeze Protection
and Flow Maintenance

Roof and Gutter De-Icing Design

If the current draw exceeds the switch rating, or if the controller will activate more
than one circuit (group control), an external contactor must be used.

Application

Surface Snow
Melting – ElectroMelt

Table 14 Power Distribution Panels
SMPG1
Control panel
Number of sensors

Up to 6

Enclosure

NEMA 1/12, NEMA 3R/4

Temperature operating
limits

Without space heater
14°F to 122°F
(–10°C to 50°C)
With a space heater
–40°F to 122°F
(–40°C to 50°C)

Supply voltage

208 V, 277 V

Circuit breaker rating

15 A, 20 A, 30 A, 40 A, 50 A

Approvals

c-UL-us

Ground-fault protection

Yes

11/13

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Technical Data
Sheets

EN-RaychemIceStopRoofGutterDeIcing-DG-H56070

Floor Heating

EUR-5A included

Freezer Frost
Heave Prevention

THERMAL MANAGEMENT SOLUTIONS

Controller

Surface Snow
Melting – MI

Note: Large systems with many circuits should use an SMPG power distribution
panel. The SMPG is a dedicated power-distribution, control, ground-fault protection,
monitoring, and alarm panel for roof and gutter de-icing applications. This enclosure
contains an assembled circuit-breaker panelboard. Panels are equipped with
ground-fault circuit breakers with or without alarm contacts. The group control
package allows the system to operate automatically in conjunction with an ambientsensing thermostat, individual electronic, or duty cycle controller.

Roof and Gutter De-icing — IceStop System
Single circuit control

Group control
Temperature
controller

Heating
cable

1 ø supply
N

Temperature
controller

1-pole
GFEP breaker

ø supply
N

ø
ø
ø

Heating cable
sheath, braid
or ground

3-phase 4-wire
supply (WYE)

Contactor

3-pole main
breaker
N
G (Typ 3)

Heating cable
sheath, braid
or ground

Fig. 26 Single circuit and group control

Main circuit breaker
(optional)

Fuse

Aerial snow sensor
Gutter ice sensor
High
temperature
sensor

Control transformer

G
N
Ø1
Ø2
Ø3

GIT-1

EUR-5A SNOW SWITCH

24 V

3-phase 4-wire
supply (WYE)

AUTOMATIC SNOW/ICE MELTING CONTROL PANEL

SUPPLY
SNOW/ICE

CIT-1

HEATER
CYCLE

HOURS

HEATER
TEMPERATURE

Heating cable
sheath, braid
or ground

One-pole with 30 mA
ground-fault trip (277 V)
Three-pole
main contactor

Single Ø
connection

Remote annunciation alarm
(circuit breaker
with alarm type #3)

Fig. 27 Typical wiring diagram of group control with SMPG1

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Table 15 Power Distribution
Catalog number

Description

Pipe Freeze Protection
and Flow Maintenance

Roof and Gutter De-Icing Design

Power Distribution and Control Panels
Single-phase power distribution panel that includes ground-fault protection, monitoring, and control for snow melting systems. Single-phase voltages include 208 and
277 V.

NP
NP

Fire Sprinkler System
Freeze Protection

SMPG1

E104

Three-pole, 100 A per pole, 600 V maximum contactor housed in UL Listed, CSA Certified, NEMA 4X enclosure with two 1-inch conduit entries. When ordering, select coil
voltage (110–120, 208–240, 277 V).

Roof and Gutter
De-Icing

Contactors and Junction Boxes

Enclosure dimensions: 13-1/2 in x 9-1/5 in x 6-11/16 in (343 mm x 234 mm x 170 mm).

Three-pole, 40 A per pole, 600 V maximum contactor housed in UL Listed, CSA Certified
NEMA 4X enclosure with two 1-inch conduit entries. When ordering, select coil voltage
(110–120, 208–240, 277 V).
Enclosure dimensions: 9-1/2 in x 7-1/5 in x 6-11/16 in (241 mm x 183 mm x 170 mm).

Step 8 Complete the Bill of Materials

1. Determine design
conditions

Surface Snow
Melting – ElectroMelt

Roof and Gutter
De-Icing

Surface Snow
Melting – MI

E304

If you used the Design Worksheet to document all your project parameters, you
should have all the details you need to complete your Bill of Materials.

2. Select the heating
cable
3. Determine the
heating cable length
4. Determine the
electrical parameters

Freezer Frost
Heave Prevention

5. Select the
connection kits
6. Select attachment
accessories and
method
7. Select the control
system and power
distribution
8. Complete the Bill
of Materials

Floor Heating

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Roof and Gutter De-icing — IceStop System
IceStop System Roof and Gutter De-Icing Design Worksheet

Step  Determine design conditions
Type of roof

Layout

Supply
voltage

❑ Sloped roof – standard

Roof edge

❑ 120 V

❑ Sloped roof – standing seam

Length of roof edge (ft/m) ___________

❑ 208–277 V

❑ Flat roof

Number of edges

Roof material

Eave overhang

❑ Shake/shingle

Min. start-up
temperature

Control method
❑ Manual on/off control

______ (°F/°C)

❑ Ambient thermostat

___________

❑ Automatic controller

Distance of overhang (in/cm)________

Gutters

❑ Rubber membrane
❑ Metal
❑ Wood
❑ Other: __________________

Length of gutters (ft/m) ___________

Number of gutters

Depth of gutters (in/cm) ___________

Width of gutters (in/cm) ___________

___________

Roof valley

Height of roof valley (ft/m)___________

Number of roof valleys

___________

Roof/wall intersection

Height of intersection (ft/m)_________

Number of intersections ___________

Downspouts

Downspout height (ft/m) ___________

Number of downspouts ___________

Example:

9 Sloped roof – standard with wood shingles and gutters
Roof edge:

50 ft
Length of roof edge

Number of edges

100 ft
Total length of roof edges

Eave overhang: 24 in
Gutters:

50 ft
Length of gutter

Number of gutters

100 ft
Total length of gutters

6 in
Depth of gutter
4 in
Width of gutter
Roof valley:

20 ft

Height of roof valley

Number of roof valleys

Downspouts:

12 ft
Downspout height

Number of downspouts

24 ft
Total downspout height

Supply voltage: 208 V
Minimum start-up temperature: 20°F
Control method: Automatic controller

120

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THERMAL MANAGEMENT SOLUTIONS

Step  Select the heating cable
See Fig. 4.

Product family

T 2 = 208, 240, 277 V

T -XT fluoropolymer

—
Supply voltage

Product family

Supply voltage

Outer jacket

Catalog number

GM-2XT

Outer jacket

Catalog number

—

Roof and Gutter
De-Icing

Example catalog number:

T -X polyolefin

GM
Product family

Outer jacket

T 1 = 120 V

Fire Sprinkler System
Freeze Protection

Use catalog number:

Supply voltage

Pipe Freeze Protection
and Flow Maintenance

IceStop System Roof and Gutter De-Icing Design Worksheet

Surface Snow
Melting – MI
Surface Snow
Melting – ElectroMelt
Freezer Frost
Heave Prevention
Floor Heating

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Sheets

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Roof and Gutter De-icing — IceStop System
Step  Determine the heating cable length
Sloped roof – standard
with
requires
Roof edge (ft/m)
Eave overhang (in/cm)

Heating cable per foot of roof edge
(ft/m)

Sloped roof – standing seam
with
requires
Roof edge (ft/m)
Eave overhang (in/cm)
Flat roof

Roof perimeter (ft/m)

From perimeter to drains (ft/m)

Heating cable per foot of roof edge
(ft/m)
=

Into internal downspouts (ft/m)

Gutters
Gutter depth (ft/m)

Roof edge (ft/m)

Heating cable per foot
of roof edge (ft/m)

Height of roof valley (ft/m)

=
=

Gutter width multiplier
=

x 1.33 x

Roof/wall intersection
Height of intersection (ft/m)

x 1.33

Downspouts

Height of downspouts (ft/m)

Number of roof valleys

Number of intersections

Number of downspouts

Heating cable with gutter
depth allowance (ft/m)
Total heating cable for roof edge (ft/m)

No gutters – heated drip edge
x 1
Roof edge (ft/m)
Roof valleys

Heating cable with gutter depth allowance (ft/m)

Gutter length (ft/m)

+
Additional heating cable (ft/m)

Heating cable for flat roof
(ft/m)

Runs of heating cable
per downspout

Heating cable for gutters (ft/m)

Heating cable for heated drip edge (ft/m)

Heating cable for roof valleys (ft/m)

Heating cable for
roof/wall intersections (ft/m)
Heating cable per downspout (ft/m)
Total heating cable length

Example: Sloped roof – standard with eave overhang and gutters
100 ft
Feet of roof edge (ft/m)
6 in
Gutter depth (ft/m)

100 ft
Roof edge (ft/m)
100 ft
Gutter length (ft/m)

24 in

with

Additional heating cable (ft/m)

4.2 ft
Heating cable per foot
of roof edge (ft/m)

Gutter width multiplier
x 1.33 x

12 ft
Height of downspouts (ft/m)

Number of roof valleys
2

Number of downspouts

1
Runs of heating cable
per downspout
2
Drip loop allowance
(1 ft with loopback)

122

5.2 ft
Heating cable with gutter
depth allowance (ft/m)

520 ft *
=
Total heating cable for roof edge (ft/m)

Heating cable with gutter
depth allowance (ft/m)

Height of roof valley (ft/m)

1 ft

Heating cable per foot of roof edge (ft/m)

5.2 ft

20 ft

Eave overhang (in/cm)

4.2 ft

requires

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100 ft *
Heating cable for gutters (ft/m)
26.6 ft rounded to 27 ft *
Heating cable for roof valleys (ft/m)
24 ft
Heating cable per downspouts (ft/m)
26 ft *
Feet heating cable for downspouts
673 ft
* Total heating cable length

THERMAL MANAGEMENT SOLUTIONS

Step  Determine the electrical parameters
Determine maximum circuit length and number of circuits (See Table 5)

Circuit breaker size: T 15 A
T 30 A

Total heating cable length required

T 208 V
T 277 V
T 20 A
T 40 A

Start-up temperature

Fire Sprinkler System
Freeze Protection

Supply voltage: T 120 V
T 240 V

Total heating cable
length required

Maximum circuit length

Maximum heating cable circuit length

Pipe Freeze Protection
and Flow Maintenance

IceStop System Roof and Gutter De-Icing Design Worksheet

Number of circuits

Determine transformer load

(

Circuit breaker rating

0.8 x

Supply voltage

)

/ 1000

Circuit breaker load (kW)

Roof and Gutter
De-Icing

Calculate the circuit breaker load (CBL)

If the CBL is equal on all circuits, calculate the transformer load as:
x
Circuit breaker load (kW) Number of breakers

=
Total transformer load (kW)

CBL1 + CBL2 + CBL3... + CBLN

Surface Snow
Melting – MI

If the CBL is NOT equal on all circuits, calculate the transformer load as:

Example:

Supply voltage: T 120 V
T 240 V

673 ft of GM-2XT

Total heating cable
length required

Circuit breaker size: T 15 A
9 30 A
T
673 ft

T 20 A
T 40 A

Start-up temperature

20°F

Maximum circuit length

355 ft

1.9 circuits, round up to 2

Number of circuits

Maximum heating cable circuit length

Determine transformer load

(

30 A
Circuit breaker rating
5 kW

Circuit breaker load (kW)

0.8

208 V

Supply voltage

)

/ 1000

4.99 kW rounded to 5 kW
Circuit breaker load (kW)

Freezer Frost
Heave Prevention

Total heating cable length required

9 208 V
T
T 277 V

Surface Snow
Melting – ElectroMelt

Determine the maximum circuit length and number of circuits

10 kW
=
Total transformer load (kW)

Number of breakers

Floor Heating

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Sheets

THERMAL MANAGEMENT SOLUTIONS

Roof and Gutter De-icing — IceStop System
Step  Select the connection kits (See Table 6)
Connection kits and
accessories

Description

Quantity

Heating cable
allowance

❑

RayClic-PC

Power connection and end seal

_____________

__________________

❑

RayClic-PS

Power splice and end seal

_____________

__________________
__________________

❑

RayClic-PT

Powered tee and end seal

_____________

❑

FTC-P

Power connection and end seal

_____________

__________________
__________________

❑

RayClic-S

Splice

_____________

❑

RayClic-T

Tee kit with end seal

_____________

__________________
__________________

❑

RayClic-X

Cross connection

_____________

❑

FTC-HST

Low-profile splice/tee

_____________

__________________
__________________

❑

RayClic-LE

Lighted end seal

_____________

❑

RayClic-E

Extra end seal

_____________

__________________

Wall mounting bracket

_____________

__________________

❑

RayClic-SB-02

Total heating cable
allowance for connection kits
Total heating cable length

Total heating cable allowance for connection kits

Total heating cable
length required

Example:
Quantity

Heating cable
allowance

9 RayClic-PC

4 ft

9 RayClic-PS

8 ft

9 RayClic-SB-02

Connection kit catalog number

12 ft
Total heating cable
allowance for connection kits
673 ft
Total heating cable length

12 ft
Total heating cable allowance for connection kits

685 ft
Total heating cable
length required

Step  Select attachment accessories and method
See “Table 7 Attachment Accessories” “Table 8 Attachment Methods for Typical Roofs” and “Table 9 Adhesives”
Adhesive is not supplied by Pentair Thermal Management

Attachment accessories

Description

Quantity

GMK-RC

Roof clips

____________

❑

GMK-RAKE

Hanger bracket

____________

❑

CT-CABLE-TIE

UV-resistant cable tie

____________

❑

Example:
100 ft roof edge and 2 gutters
9 GMK-RC

3 boxes of 50 (from Table 7)

9 GM-RAKE

2 (from Table 7)

124

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THERMAL MANAGEMENT SOLUTIONS

Step  Select the control system and power distribution
Control Systems
See “Table 10 ECW-GF Thermostat” “Table 11 Automatic Controllers” “Table 12 Moisture/Temperature Sensors” “Table 13 Control Systems”

Description

Quantity

Electronic thermostat with 25-ft sensor

____________

❑

APS-3C

Automatic snow melting controller

____________

❑

APS-4C

Automatic snow melting controller

____________

❑

SC-40C

Satellite contactor

____________

❑

ETI PD Pro

Gutter de-icing controller

____________

❑

ETI GF Pro

Gutter de-icing controller

____________

❑

CIT-1

Overhead snow sensor

____________

❑

GIT-1

Gutter sensor

____________

❑

RCU-3

Remote control unit for APS-3C

____________

❑

RCU-4

Remote control unit for APS-4C

____________

❑

ACS-UIT2

ACS-30 user interface terminal

____________

❑

ACS-PCM2-5

ACS-30 power control panel

____________

❑

ProtoNode-LER

Multi-protocol gateway

____________

❑

ProtoNode-RER

Multi-protocol gateway

____________

❑

RTD3CS

Resistance temperature device for DigiTrace ACS-30

____________

❑

RTD10CS

Resistance temperature device for DigiTrace ACS-30

____________

❑

RTD200

Resistance temperature device for DigiTrace ACS-30

____________

❑

RTD50CS

Resistance temperature device for DigiTrace ACS-30

____________

Surface Snow
Melting – MI

ECW-GF

Roof and Gutter
De-Icing

❑

Fire Sprinkler System
Freeze Protection

Thermostats, controllers
and accessories

Pipe Freeze Protection
and Flow Maintenance

IceStop System Roof and Gutter De-Icing Design Worksheet

Example:
Supply voltage

Snow melting and gutter de-icing
sensors and accessories

9 APS-4C

9 SC-40C

1
2 (one for each gutter section)
1

9 GIT-1
9 CIT-1

Surface Snow
Melting – ElectroMelt

Controller(s)

208 V (from Step 1)

Power distribution
See “Table 14 Power Distribution Panels” and “Table 15 Power Distribution”

Power distribution and control
panels
SMPG1

Contactors

Quantity

Single-phase power distribution panel

____________

Description

Quantity

❑

E104

Three-pole, 100 A per pole contactor

____________

❑

E304

Three-pole, 40 A per pole contactor

____________

Freezer Frost
Heave Prevention

❑

Description

Step  Complete the Bill of Materials
Floor Heating

Use the information recorded in this worksheet to complete the Bill of Materials.

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Sheets

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Roof and Gutter De-icing — IceStop System

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Pipe Freeze Protection
and Flow Maintenance

Mineral insulated Heating Cable System

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Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating

If your application conditions are different, or if you have any questions, contact your
Pentair Thermal Management representative or contact Pentair Thermal
Management directly at (800) 545‑6258.

Freezer Frost
Heave Prevention

The Pyrotenax Mineral Insulated (MI) heating cable system is designed for surface
snow melting in concrete and asphalt, and under pavers.

Surface Snow
Melting – ElectroMelt

Introduction

Surface Snow
Melting – MI

Contents
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
How to Use this Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Safety Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
System Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Typical System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
MI Heating Cable Construction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
MI Heating Cable Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
Approvals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Surface Snow Melting Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Surface Snow Melting Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Design Step by Step. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Step 1 Determine design conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Step 2 Determine the required watt density . . . . . . . . . . . . . . . . . . . . . . . . 135
Step 3 Determine the total area to be protected. . . . . . . . . . . . . . . . . . . . . 136
Step 4 Select the heating cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Step 5 Determine heating cable spacing. . . . . . . . . . . . . . . . . . . . . . . . . . . 148
Step 6 Determine the electrical parameters. . . . . . . . . . . . . . . . . . . . . . . . 150
Step 7 Select the control system and power distribution. . . . . . . . . . . . . . 152
Step 8 Select the accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
Step 9 Complete the Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
Pyrotenax MI System Surface Snow Melting Design Worksheet. . . . . . . . . . . . . . . 163

Roof and Gutter
De-Icing

This step-by-step design guide provides the tools necessary to design a Pyrotenax
Mineral Insulated heating cable surface snow melting system. For other applications
or for design assistance, contact your Pentair Thermal Management representative
or phone Pentair Thermal Management at (800) 545‑6258. Also, visit our web site at
www.pentairthermal.com.

Fire Sprinkler System
Freeze Protection

Surface snow melting – MI

Surface snow melting – MI Mineral insulated Heating Cable System
How to Use this Guide

This design guide presents Pentair Thermal Management’ recommendations for
designing a Pyrotenax Mineral Insulated (MI) heating cable surface snow melting
system. It provides design and performance data, electrical sizing information, and
heating cable layout suggestions. Following these recommendations will result in a
reliable, energy-efficient system.
Follow the design steps in the section “Surface Snow Melting Design” on page 132
and use the “Pyrotenax MI System Surface Snow Melting Design Worksheet” on
page 163 to document the project parameters that you will need for your project’s
Bill of Materials.
Other Required Documents

This guide is not intended to provide comprehensive installation instructions. For
complete Pyrotenax MI surface snow melting system installation instructions, please
refer to the following additional required documents:
• Surface Snow Melting – MI Installation and Operation Manual (H57754)
• Additional installation instructions included with thermostats, controllers, and accessories
If you do not have these documents, you can obtain them from the Pentair Thermal
Management web site at www.pentairthermal.com.
For products and applications not covered by this design guide, including
installations in hazardous locations or where electromagnetic interference (EMI) may
be of concern, such as traffic loop detectors, please contact your Pentair Thermal
Management representative or call Pentair Thermal Management at (800) 545-6258.
Safety Guidelines
As with any electrical equipment, the safety and reliability of any system depends
on the quality of the products selected and the manner in which they are installed
and maintained. Incorrect design, handling, installation, or maintenance of any of
the system components could damage the system and may result in inadequate
performance, overheating, electric shock, or fire. To minimize these risks and to
ensure that the system performs reliably, read and carefully follow the information,
warnings, and instructions in this guide.
This symbol identifies important instructions or information.

This symbol identifies particularly important safety warnings that must be
followed.

Warranty
Pentair Thermal Management’s standard limited warranty applies to Pyrotenax
Snow Melting Systems.
An extension of the limited warranty period to ten (10) years from the date of
installation is available, except for the control and distribution systems, if a properly
completed online warranty form is submitted within thirty (30) days from the date of
installation. You can access the complete warranty on our web site at
www.pentairthermal.com.
128

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THERMAL MANAGEMENT SOLUTIONS

System Overview

Typical System

Fire Sprinkler System
Freeze Protection

The Pyrotenax MI heating cable surface snow melting system provides snow melting
for concrete, asphalt, and pavers. The copper-sheathed, mineral insulated heating
cables are coated with a high-density polyethylene (HDPE) jacket and are supplied as
complete factory-assembled cables ready to connect to a junction box. The seriestype technology, inherent to all mineral insulated heating cables, provides a reliable
and consistent heat source that is ideal for embedded snow melting applications.
The system includes heating cable, junction boxes, a control system and sensors,
power distribution, and the tools necessary for a complete installation.

Pipe Freeze Protection
and Flow Maintenance

System Overview

A typical system includes the following:
Roof and Gutter
De-Icing

• MI heating cable
• Junction boxes and accessories
• Snow controller and sensors
• Power distribution
Power Distribution Panel

Surface Snow
Melting – MI

Aerial Snow Sensor
Snow Controller

Surface Snow
Melting – ElectroMelt

Junction Box
Caution Sign

Pavement Snow Sensor

Heating Cable

Freezer Frost
Heave Prevention

Flexible Nonmetallic
Conduit

Hot/Cold Joint

Floor Heating

Fig. 1 Typical Pyrotenax MI system

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Sheets

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Surface snow melting – MI Mineral insulated Heating Cable System
MI Heating Cable Construction
Standard surface snow melting MI heating cables are comprised of a single
conductor surrounded by magnesium oxide insulation, a solid copper sheath, and
an extruded high density polyethylene (HDPE) jacket. The HDPE jacket protects
the copper sheath from corrosive elements that can exist in surface snow melting
applications.

Insulation (magnesium oxide)

HDPE jacket

Heating conductor

Copper sheath

Single-conductor
Fig. 2 MI heating cable
construction cable

Custom engineered heating cables are also available for applications outside the
scope of this design guide. For design criteria, including the maximum cable loading
(watts/foot) for installations in concrete, asphalt and paver applications, refer to
the MI Heating Cable for Commercial Applications data sheet (H56990) or contact
Pentair Thermal Management at (800) 545-6258 for design assistance.
MI Heating Cable Configuration
MI heating cables are supplied as complete factory-fabricated assemblies consisting
of an MI heating section that is joined to a section of MI nonheating cold lead and
terminated with NPT-threaded connectors. Two configurations are available for
standard heating cables:
1. Type SUA, consisting of a looped cable joined to a single 7 ft (2.1 m) cold lead
with one 1/2-in NPT-threaded connector.
2. Type SUB, consisting of a single run of cable with a 15 ft (4.6 m) cold lead and a
1/2-in NPT-threaded connector on each end. Where custom cold lead lengths
are required for the heating cables shown in Table 2, Table 3, Table 4, and
Table 5, contact your Pentair Thermal Management sales representative for
assistance.
Type SUA

Cold lead length
7 ft (2.1 m)

Heated length

NPT-threaded
connector

Type SUB

Cold lead length
15 ft (4.6 m)

Heated length

Cold lead length
15 ft (4.6 m)

NPT-threaded
connector

Fig. 3 MI heating cable configurations

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Approvals

De-Icing and Snow
Melting Equipment

421H

Fire Sprinkler System
Freeze Protection

The Pyrotenax MI surface snow melting system is UL Listed and CSA Certified for
installation in nonhazardous locations in concrete and asphalt, and under pavers
where the cables are embedded in concrete. For paver snow melting installations
where the heating cables are embedded in sand or limestone screenings, special
permission is required from the Authority Having Jurisdiction, e.g. the local
inspection authority.

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting Applications

-PS

Surface Snow Melting Applications
Roof and Gutter
De-Icing

SURFACE SNOW MELTING

Surface snow melting systems provide the required heat flux (W/ft2 or W/m2) to melt
snow and ice on ramps, slabs, driveways, sidewalks, platform scales, and stairs and
prevent the accumulation of snow under normal snow conditions.
Application Requirements and Assumptions

The design for a standard surface snow melting application is based on the
following:
Heating cable

• 4 to 6 in (10 to 15 cm) thick
• Placed on grade
• Standard density

• Secured to reinforcing steel, mesh or
with prepunched strapping
• Located approximately 2 in (5 cm) below
finished surface, but not exceeding 3 in
(7.5 cm)

Surface Snow
Melting – MI

Reinforced Concrete

Asphalt
• Secured with prepunched strapping
• Located 2 in (5 cm) below finished
surface

Pavers
• Secured to the compacted base or concrete with mesh or prepunched
strapping
• Located in a minimum 1 in (2.5 cm) layer
of limestone screenings or sand

Nonstandard applications are not covered in this design guide, but are available by
contacting your Pentair Thermal Management representative for design assistance.
Using proprietary computer modeling based on a finite difference program for
nonstandard applications, Pentair Thermal Management can design an appropriate
snow melting system.

• Concrete thinner than 4 in (10 cm)
• Concrete thicker than 6 in (15 cm)
• Lightweight concrete

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Sheets

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• Ramps, walkways, and stairs with air
below
• Concrete without reinforcing bar or
mesh
• Retrofitting of heating cable to existing
pavement

Floor Heating

The following are examples of nonstandard applications not addressed in this design
guide:

Freezer Frost
Heave Prevention

• 1 ½ to 2 ¼ in (4 to 6 cm) thick pavers
• Minimum 1 in (2.5 cm) limestone
screenings or sand layer
• Placed on an approved compacted
base or concrete slab

Surface Snow
Melting – ElectroMelt

• Install on 1 in (2.5 cm) asphalt base
layer if a concrete base is used in
construction
• Placed on grade

Surface snow melting – MI Mineral insulated Heating Cable System
Surface Snow Melting Design
This section details the steps necessary to design your application. The examples
provided in each step are intended to incrementally illustrate sample project designs
from start to finish. As you go through each step, use the “Pyrotenax MI System
Surface Snow Melting Design Worksheet” on page 163 to document your project
parameters, so that by that end of this section, you will have the information you
need for your Bill of Materials.
Design Step by Step
Your system design requires the following essential steps:

 Determine design conditions
 Determine the required watt density
 Determine the total area to be protected
 Select the heating cable
 Determine heating cable spacing
 Determine the electrical parameters
 Select the control system and power distribution
 Select the accessories
 Complete the Bill of Materials

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THERMAL MANAGEMENT SOLUTIONS

Surface Snow Melting

Step 1 Determine design conditions

1. Determine design
conditions

3. Determine the total
area to be protected
4. Select the heating
cable
5. Determine heating
cable spacing
6. Determine the
electrical parameters

8. Select the
accessories
9. Complete the Bill
of Materials

–– Geographical location
• Paving material
–– Concrete
–– Asphalt
–– Pavers
• Size and layout
–– Slab surface area
–– Ramp surface area

Roof and Gutter
De-Icing

7. Select the control
system and power
distribution

• Environment
Fire Sprinkler System
Freeze Protection

2. Determine the
required watt density

Collect the following information to determine your design conditions:

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting Design

–– Stairs
-- Number of stairs
-- Stair width
-- Riser height
-- Stair depth
-- Landing surface area

Surface Snow
Melting – MI

–– Wheel tracks
-- Track length
–– Concrete joints
–– Surface drains
–– Location of area structures
–– Other information as appropriate
• Supply voltage
• Phase (single-phase or three-phase)
–– Automatic snow melting controller
–– Slab sensing thermostat
–– Manual on/off control

Prepare Scale Drawing

Expansion joint

Floor Heating

Draw to scale the area in which the snow melting cables will be installed, and note
the rating and location of the voltage supply. Include stairs and paths for melting
water
runoff.
concrete joints, surface drains, and location of area structures
P
PowerShow
connection
including
post
installations
for railings, permanent benches, and flagpoles.
E
End seal
Measurements for each distinct section of the snow melting application, including
S
Splice
stairs, will allow for an accurate system design, including control configuration. Use
these symbols to indicate the heating cable expansion and crack-control joints:

Freezer Frost
Heave Prevention

Note: Drainage must be a primary concern in any snow melting system design.
Improper drainage will result in ice formation on the surface of the heated area once
the system is de-energized. Ice formation along the drainage path away from the
heated area may create an ice dam and prohibit proper draining. If your design
conditions may lead to drainage problems, please contact Pentair Thermal
Management Technical Support for assistance.

Surface Snow
Melting – ElectroMelt

• Control method

Crack-control joint
Expansion
joint kit
Fig. 4 Design
symbols

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133

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Surface snow melting – MI Mineral insulated Heating Cable System
Example: Surface Snow Melting System
Geographical location Philadelphia, PA
Ramp surface area

45 ft x 12 ft (13.7 m x 3.66 m)

Paving material

Concrete

Supply voltage

480 V, three-phase

Control method

Automatic snow melting controller

Example: Surface Snow Melting System for Stairs
Geographical location Philadelphia, PA
Number of stairs

Stair width

5 ft (1.52 m)

Riser height

8 in (20 cm)

Stair depth

11 in (28 cm)

Landing surface area 5 ft x 3 ft (1.52 m x 0.91 m)
Paving material

Concrete

Supply voltage

208 V, single-phase

Control method

Slab sensing thermostat

Example: Surface Snow Melting System for Wheel Tracks
Geographical location Philadelphia, PA

134

Track length

28 ft (8.5 m)

Paving material

Asphalt

Supply voltage

240 V, single-phase

Control method

Automatic snow melting controller

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THERMAL MANAGEMENT SOLUTIONS

Surface Snow Melting

Step 2 Determine the required watt density

1. Determine design
conditions

4. Select the heating
cable

Surface Snow Melting

2. Determine the
required watt density

5. Determine heating
cable spacing
6. Determine the
electrical parameters

Table 1 Required Watt Density for Surface Snow Melting
Watts/ft2

8. Select the
accessories
9. Complete the Bill
of Materials

City

Watts/m2

Asphalt
Asphalt
Concrete
or
or
Concrete
Concrete pavers
stairs Concrete pavers
stairs

Roof and Gutter
De-Icing

7. Select the control
system and power
distribution

Table 1 summarizes the required watt density for most major cities in North America
based on typical minimum ambient temperatures and the snowfall patterns. Select
the city from the list, or closest city, where similar climatic conditions exist.

Fire Sprinkler System
Freeze Protection

3. Determine the total
area to be protected

For maximum performance from any snow melting system, you must first take
into account the local snowfall patterns. A system design that works well in one
city may be inadequate in another. The energy required to melt snow varies with air
temperature, wind speed, relative humidity, snow density, and the depth of the snow
on the pavement.

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting Design

USA
40
40
45
40
40
40
40
40
50
35
40
50
40
50
40
35
35
40

40
45
45
40
40
40
40
40
55
40
40
55
45
50
45
40
40
45

377
377
431
377
377
377
377
377
538
377
377
538
377
484
377
377
377
377

431
431
484
431
431
431
431
431
538
377
431
538
431
538
431
377
377
431

431
484
484
431
431
431
431
431
592
431
431
592
484
538
484
431
431
484

45
50
40
35
40
45
45
50
45
50
50
40
35
40
50
35
35
50

45
50
45
40
40
45
45
55
45
55
50
45
35
45
55
40
40
55

50
55
45
40
45
50
50
55
50
55
55
45
40
50
55
40
40
55

484
538
431
377
431
484
484
538
484
538
538
431
377
431
538
377
377
538

484
538
484
431
431
484
484
592
484
592
538
484
377
484
592
431
431
592

538
592
484
431
484
538
538
592
538
592
592
484
431
538
592
431
431
592

Surface Snow
Melting – ElectroMelt

35
35
40
35
35
35
35
35
50
35
35
50
35
45
35
35
35
35

Surface Snow
Melting – MI

Baltimore, MD
Boston, MA
Buffalo, NY
Chicago, IL
Cincinnati, OH
Cleveland, OH
Denver, CO
Detroit, MI
Great Falls, MT
Greensboro, NC
Indianapolis, IN
Minneapolis, MN
New York, NY
Omaha, NE
Philadelphia, PA
Salt Lake City, UT
Seattle, WA
St. Louis, MO

Canada

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135

Technical Data
Sheets

EN-PyrotenaxMISurfaceSnowMelting-DG-H57045

Floor Heating

THERMAL MANAGEMENT SOLUTIONS

Freezer Frost
Heave Prevention

Calgary, AB
Edmonton, AB
Fredericton, NB
Halifax, NS
Moncton, NB
Montreal, QC
Ottawa, ON
Prince George, BC
Quebec, QC
Regina, SK
Saskatoon, SK
St. John, NB
St. John’s, NF
Sudbury, ON
Thunder Bay, ON
Toronto, ON
Vancouver, BC
Winnipeg, MB

Surface snow melting – MI Mineral insulated Heating Cable System
Example: Surface Snow Melting System
Geographical location

Philadelphia, PA (from Step 1)

Paving material

Concrete (from Step 1)

Required watt density

35 W/ft2 (377 W/m2) (from Table 1)

Example: Surface Snow Melting System for Stairs
Geographical location

Philadelphia, PA (from Step 1)

Paving material

Concrete (from Step 1)

Required watt density

45 W/ft2 (484 W/m2) (from Table 1)

Example: Surface Snow Melting System for Wheel Tracks

Surface Snow Melting
1. Determine design
conditions
2. Determine the
required watt density
3. Determine the total
area to be protected
4. Select the heating
cable
5. Determine heating
cable spacing
6. Determine the
electrical parameters

Geographical location

Philadelphia, PA (from Step 1)

Paving material

Asphalt (from Step 1)

Required watt density

40 W/ft2 (431 W/m2) (from Table 1)

Step 3 Determine the total area to be protected
Surfaces

To select the proper heating cable you need to know the size of the surface area
you will be protecting from snow accumulation. For large areas, divide the area
into smaller subsections no greater than 400 ft2 (37.2 m2). For three-phase voltage
supplies, create multiples of three equal areas not exceeding 400 ft2 (37.2 m2) as
shown in Fig. 5. Do not exceed 20 ft (6.1 m) in any direction. If assistance is required
to select heating cables for irregularly-shaped areas, please contact your Pentair
Thermal Management representative.
Total surface area (ft2/m2) = Length (ft/m) x Width (ft/m)

7. Select the control
system and power
distribution
8. Select the
accessories
9. Complete the Bill
of Materials

15 ft (4.57 m)

12 ft
3.66 m)

15 ft (4.57 m)

45 ft (13.7 m)

Fig. 5 Example for surface snow melting

Joints in Concrete
Many large concrete slabs are constructed with control and expansion joints. There
are three types of joints that can be placed in concrete slabs. An explanation of each
follows:
1. Crack-control joints (sawcuts) are intended to control where the slab will crack.
Their exact location is determined by the concrete installers before the concrete is
poured. Because of the reinforcement in the base slab, there is rarely a shearing
action caused by differential vertical movement between the concrete on either side
of the crack. As a precautionary measure, however, either of the two methods of
crossing control joints shown in Fig. 7 should be used. Minimize the number of times
the joint is crossed as shown in Fig. 7. When installing cables using the two-pour
method, control joints must be placed in both the base slab and the surface slab.

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THERMAL MANAGEMENT SOLUTIONS

3. Expansion joints are placed where a concrete slab abuts a structure, such as
a building, a slab, or a foundation, etc. Since the reinforcement does not cross
expansion joints, differential movement will occur between the slab and the
adjoining structure. Avoid crossing expansion joints with the heating cable. If this is
not possible, expansion joints can be crossed using a sand filled metal box as shown
in Fig. 6.

Roof and Gutter
De-Icing

Heating
cable

Metal
box
(sand not shown)

Fire Sprinkler System
Freeze Protection

2. Construction joints are joints that occur when the concrete pour is going to
stop but will resume at a later date. Therefore their location may not be known
beforehand. However, the rebar is left protruding out of the first pour so that it enters
the next pour and therefore shearing action rarely occurs due to differential vertical
movement between the concrete on either side of the joint. As a precautionary
measure, either of the two methods of crossing control joints shown in Fig. 7 should
be used.

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting Design

Expansion
joint

Surface Snow
Melting – MI

Heating
cable

Concrete slab
Well drained
gravel base

Fig. 6 Crossing expansion joints

Cold leads may cross expansion joints provided that they are fed through nonmetallic
conduit to protect against shear (see Fig. 7).
Important Points to Remember

Surface Snow
Melting – ElectroMelt

6 in x 6 in x 4 in
(15 cm x 15 cm x 10 cm)
metal box filled with sand

• Concrete slabs should have crack-control joints at intervals typically not exceeding 20 ft (6.1 m).

• Avoid crossing expansion joints. If possible, design for a sufficient number of
heating cables so that the cables do not cross expansion joints.

Freezer Frost
Heave Prevention

• When crossing crack-control joints, protect the cable as shown in Fig. 7 or design
for a sufficient number of heating cables to avoid crossing control joints altogether.

Floor Heating

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137

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Surface snow melting – MI Mineral insulated Heating Cable System

1 x 1 x 12 in
(2.5 x 2.5 x 30 cm)
angle iron filled
with RTV or silicone
rubber caulk

Heating cable

Angle iron

Base slab
Well-drained base
Nonmetallic
conduit
Control joint

Control joints
(cut into both bottom
and top slabs for two
Hot/cold joints pour installations)
Cold leads
Concrete

Heating cable secured
to rebar with plastic
tie wraps
Steel rebar

Fig. 7 Method of crossing crack-control joints with MI heating cable in concrete slabs

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THERMAL MANAGEMENT SOLUTIONS

Example: Surface Snow Melting System
45 ft x 12 ft = 540 ft2 (from Step 1)
(13.7 m x 3.66 m = 50.1 m2)

For three-phase, divide the ramp
into three equal subsections

15 ft x 12 ft = 180 ft2 (see Fig. 5)
(4.57 m x 3.66 m = 16.7 m2)

Continue with “Step 4 Select the heating cable” on page 141, and use Table 2 or
Table 3 to select an appropriate heating cable.
Stairs

Note: Stairs typically require a heating cable that is a specific length. In many
cases, it may not be possible to find a SUA/SUB heating cable of the exact length,
and a custom engineered heating cable will be required. In these cases, or for
elevated stairs or stairs that are not concrete, please contact your Pentair Thermal
Management representative for assistance in designing a custom engineered
heating cable.

Surface Snow
Melting – MI

Junction
box
W
5 ft idth
(1.5
2m

ir
Sta pth
de 1 in
1 )
cm
(28

Roof and Gutter
De-Icing

Snow melting applications in concrete stairs present a problem distinct from snow
melting on single layer surfaces. Heat loss in stairs occurs from the two exposed
surfaces: the top of each stair and its side. Melting snow and ice from stairs requires
one run of heating cable be installed 2 to 3 in (5 to 7.5 cm) maximum from the front,
or nose, of each stair at a depth of 2 in (5 cm) below the surface of the stair.

Fire Sprinkler System
Freeze Protection

Total ramp surface area

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting Design

)

Surface Snow
Melting – ElectroMelt

R
he iser
igh
t (2 8 i
0cn
m

t
3 f m)
1
9
.
(0

)

Freezer Frost
Heave Prevention

Fig. 8 Example for concrete stair
Floor Heating

Typically, three runs of cable are used for stairs with a depth of 10.5 to 12 in
(27–30 cm); two runs of cable may be used for stairs with a depth of less than 10.5 in
(27 cm). Riser height is typically 8 in (20 cm). For stairs greater than 12 in (30 cm) in
depth, contact your Pentair Thermal Management representative.
Use the formulas below to determine the length of cable required for stairs (a) and
for an attached landing (b), if any, where no expansion joint exists between the stair
and landing.

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139

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Surface snow melting – MI Mineral insulated Heating Cable System
(a) Length of cable
for stair (ft/m)

(b) Length of cable for
=
attached landing (ft)
Length of cable for
=
attached landing (m)

No. of stairs x [(No. of runs per stair x stair width (ft/m))
+ (2 x riser height (ft/m))]
Landing area (ft2) x 12
4.5
Landing area (m2) x 1000
115

For applications where the landing area is very large or where an expansion joint
exists between the stairs and landing, consider the stairs and landing as two
separate areas. In these cases, determine the length of cable required for the stairs
as shown above and select the cable for the landing as shown for surface snow
melting.
Example: Surface Snow Melting System for Stairs
Number of stairs

5 stairs (from Step 1)

Stair width

5 ft (1.52 m) (from Step 1)

Riser height

8 in (20 cm) convert to 0.7 ft (0.2 m) (from Step 1)

Stair depth

11 in (28 cm) (from Step 1)

Number of cable runs per stair

3 runs (for 11 in (28 cm) stair depth)

Length of cable for stair

5 stairs x [(3 x 5 ft) + (2 x 0.7 ft)] = 82 ft
5 stairs x [(3 x 1.52 m) + (2 x 0.2 m)] = 25 m

Landing surface area

5 ft x 3 ft = 15 ft2 (from Step 1)
1.52 m x 0.91 m = 1.4 m2

Length of cable for attached landing (15 ft2 x 12) / 4.5 = 40 ft

(1.4 m2 x 1000) / 115 = 12.2 m
Total heating cable length required 82 ft + 40 ft = 122 ft

25 m + 12.2 m = 37.2 m
Continue with “Step 4 Select the heating cable” on page 141‚ and use Table 4 on
page 146 to select an appropriate heating cable.
Wheel Tracks

To reduce power consumption for concrete and asphalt driveways, it may be
sufficient to snow melt only the wheel tracks. However, do not snow melt only
the wheel tracks in paver applications because of potential problems with pavers
sinking.
It is not necessary to calculate the area of the wheel track to select the heating
cable. Four runs of heating cable per wheel track spaced evenly over the track width,
typically 18 in (46 cm), will provide sufficient heat for snow melting.
Heated area

10 ft
(3.0 m)

28 ft (8.5 m)
Junction box

Fig. 9 Example for wheel tracks

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THERMAL MANAGEMENT SOLUTIONS

Example: Surface Snow Melting System for Wheel Tracks
Wheel track length

28 ft (8.5 m) (from Step 1)

Typical wheel track width

18 in (46 cm)

Surface Snow Melting

Step 4 Select the heating cable

1. Determine design
conditions
2. Determine the
required watt density

4. Select the heating
cable
5. Determine heating
cable spacing
6. Determine the
electrical parameters
7. Select the control
system and power
distribution

9. Complete the Bill
of Materials

Select a heating cable from Table 2 on page 142 or Table 3 on page 143. When
selecting cables from Table 2, ensure that the selected cable is suitable for use
when embedded in the paving material being used. The heating cables in Table 3
are suitable for surface snow melting applications where the cables will be directly
embedded only in concrete. To select a cable, first calculate the required heating
cable output (watts) by multiplying the watt density by the area or subsection area.
Under the appropriate voltage in Table 2 or Table 3, select a heating cable from the
shaded column with a heating cable output equal to or up to 30% greater than the
calculated wattage. In cases where the surface area has been divided into equal
subsections, select the appropriate number of heating cables.
Required watts

Number of cables =

Surface Snow
Melting – MI

8. Select the
accessories

Surfaces

Roof and Gutter
De-Icing

3. Determine the total
area to be protected

Three-phase supply voltages, including 208 V, 480 / 277 V, and 600 / 347 V, are
commonly used for snow melting applications for large areas. For small areas, a
single-phase supply voltage must be used. A snow melting system designed for a
three-phase supply uses three identical heating cables in each circuit, resulting in
the following advantages: fewer circuits, reduced distribution system costs, and a
balanced heating system load.

Fire Sprinkler System
Freeze Protection

Continue with “Step 4 Select the heating cable” on page 141 and use Table 5 on
page 147 to select an appropriate heating cable.

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting Design

Watt density x Area
Number of subsection areas
Surface Snow
Melting – ElectroMelt

Example: Surface Snow Melting System
Supply voltage

480 V, three-phase (from Step 1)

Required watt density for ramp

35 W/ft2 (377 W/m2) (from Step 2)

Subsection area (for 3 equal areas)

180 ft2 (16.7 m2) (from Step 3)

Required watts (for each subsection)

35 W/ft2 x 180 ft2 = 6300 W
377 W/m2 x 16.7 m2 = 6300 W
SUB20

6450 W

Freezer Frost
Heave Prevention

Heating cable catalog number
Cable wattage

Cable voltage
480 V (for cables connected in Delta
configuration)
Heating cable length

340 ft (103.6 m)

Number of cables

3 (one cable required for each subsection)

Floor Heating

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141

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Surface snow melting – MI Mineral insulated Heating Cable System
Table 2 Selection Table for Concrete, Asphalt, and Paver Areas
Heating cable
catalog number

Heating cable output
Concrete Asphalt

Pavers 1

Heating cable length

(W)

(ft)

(m)

Heating cable
current
(A)

120 V
SUA5

Yes

550

12.2

4.6

SUA9

Yes

1100

20.1

9.2

208 V
SUA4

Yes

1600

20.7

SUA7

Yes

2300

7.7
11.1

SUB1

Yes

3100

132

40.2

14.9

SUB3

Yes

3900

280

85.3

18.8

SUB5

Yes

5500

260

79.2

26.4

SUB7

Yes

7000

310

94.5

33.7

SUB9

Yes

9000

630

192

43.3

SUB10

Yes

13000

717

218.5

62.5

Yes

2000

140

42.7

8.3

240 V
SUA3
SUA8

Yes

3200

177

53.9

13.3

SUB2

Yes

4000

240

73.1

16.7

SUB3

Yes

5200

280

85.3

21.7

SUB4

Yes

6000

320

97.5

SUB5

Yes

7350

260

79.2

30.6

SUB6

Yes

7500

375

114.3

31.3

SUB8

Yes

9000

550

167.6

37.5

SUB7

Yes

9250

310

94.5

38.5

SUB9

Yes

12000

630

192

SUB10

Yes

17000

717

218.5

70.8

277 V
SUA3

Yes

2740

140

42.7

9.9

SUA8

Yes

4100

177

53.9

14.8

SUB15

Yes

4250

225

68.6

15.3

SUB2

Yes

5300

240

73.1

19.1

SUB16

Yes

6180

310

94.5

22.3

SUB3

Yes

6850

280

85.3

24.7

SUB4

Yes

8000

320

97.5

28.9

SUB17

Yes

8700

440

134.1

31.4

SUB6

Yes

10200

375

114.3

36.8

SUB18

Yes

12000

560

170.7

43.3

SUB8

Yes

12200

550

167.6

44.0

SUB9

Yes

16400

630

192

59.2

Yes

4700

245

74.7
103.6

480 V
SUB19

9.8

SUB20

Yes

6450

340

SUB21

Yes

8700

440

134.1

18.1

13.4

SUB22

Yes

11000

525

160

22.9

1 Cables embedded in sand or limestone screenings.

Note: Type SUA cables supplied with 7 ft (2.1 m) cold lead. Type SUB cables supplied with 15 ft (4.6 m) cold leads. Tolerance on
heating cable length is –0% to +3%.
To modify cold lead length, contact your Pentair Thermal Management sales representative.

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THERMAL MANAGEMENT SOLUTIONS

Table 2 Selection Table for Concrete, Asphalt, and Paver Areas

Concrete Asphalt

Pavers 1

Heating cable length

(W)

(ft)

(m)

Heating cable
current
(A)

Fire Sprinkler System
Freeze Protection

Heating cable
catalog number

Heating cable output

600 V
SUB11

Yes

4100

225

68.6

6.8

SUB12

Yes

5800

310

94.5

9.7

SUB13

Yes

8000

428

130.5

13.3

SUB14

Yes

11000

548

167

18.3

1 Cables embedded in sand or limestone screenings.

Table 3 Selection Table for Concrete Areas
Heating cable
output

Heating cable
length

(W)

(ft)

1400

Heating cable
current

(m)

(A)

15.2

6.7

Surface Snow
Melting – MI

The heating cables in Table 3 have been specifically designed for use only in
concrete. Do not use these cables in asphalt or for paver areas because they exceed
the maximum watts per foot loading for these applications (embedded in asphalt 25
watts/foot maximum; embedded in sand/limestone screenings for paver areas – 20
watts/foot maximum). To select a cable, calculate the required heating cable output
(watts) as shown in the example earlier in this section.

Roof and Gutter
De-Icing

Heating cable
catalog number

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting Design

208 V
SUB1402

1700

19.5

8.2

2000

22.0

9.6

SUB2402

2400

27.4

11.5

SUB2802
SUB3402

2800
3400

103
121

31.4
36.9

13.5
16.3

SUB3902

3900

139

42.4

18.8

SUB4502

4500

160

48.8

21.6

5500

197

60.1

26.4

6400

226

68.9

30.8

SUB7802

7800

277

84.5

37.5

SUB10302

10300

368

112.2

49.5

SUB12802

12800

455

138.7

61.5

SUB16102

16100

576

175.6

77.4

Freezer Frost
Heave Prevention

SUB5502
SUB6402

Surface Snow
Melting – ElectroMelt

SUB1702
SUB2002

Note: Type SUB cables supplied with 15 ft (4.6 m) cold leads. Tolerance on heating cable
length is –0% to +3%. To modify cold lead length, contact your Pentair Thermal
Management sales representative.
Floor Heating

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Surface snow melting – MI Mineral insulated Heating Cable System
Table 3 Selection Table for Concrete Areas
Heating cable
catalog number

Heating cable
output

Heating cable
length

Heating cable
current

(W)

(ft)

(m)

(A)

SUB1604

1600

18.0

6.7

SUB2004

2000

22.6

8.3

SUB2304

2300

25.6

9.6

SUB2804

2800

103

31.4

11.7

SUB3204

3200

120

36.6

13.3

SUB3904

3900

140

42.7

16.3

SUB4504

4500

160

48.8

18.8

SUB5204

5200

185

56.4

21.7

SUB6404

6400

225

68.6

26.7

SUB7304

7300

263

80.2

30.4

SUB9004

9000

320

97.6

37.5

SUB11904

11900

426

129.9

49.6

SUB14704

14700

528

161.0

61.3

SUB18604

18600

664

202.4

77.5

SUB1807

1800

21.3

6.5

SUB2307

2300

25.9

8.3

SUB2707

2700

29.0

9.7

SUB3207

3200

119

36.3

11.6

SUB3807

3800

135

41.2

13.7

SUB4507

4500

162

49.4

16.2

SUB5207

5200

184

56.1

18.8

SUB6007

6000

213

64.9

21.7

SUB7307

7300

262

79.9

26.4

SUB8507

8500

300

91.5

30.7

SUB10307

10300

372

113.4

37.2

SUB13707

13700

491

149.7

49.5

SUB17207

17200

600

182.9

62.1

240 V

277 V

347 V
SUB2305

2300

25.9

6.6

SUB2905

2900

107

32.6

8.4

SUB3405

3400

119

36.3

9.8

SUB4105

4100

148

45.1

11.8

SUB4705

4700

171

52.1

13.5

SUB5605

5600

205

62.5

16.1

SUB6505

6500

231

70.4

18.7

SUB7505

7500

267

81.4

21.6

SUB9205

9200

327

99.7

26.5

SUB10605

10600

380

115.9

30.5

SUB13005

13000

463

141.2

37.5

SUB17205

17200

614

187.2

49.6

144

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THERMAL MANAGEMENT SOLUTIONS

Table 3 Selection Table for Concrete Areas
Heating cable
length

(W)

(ft)

SUB3208

3200

SUB4008

4000

SUB4708
SUB5708

Heating cable
current

(m)

(A)

118

36.0

6.7

147

44.8

8.3

4700
5700

163
202

49.7
61.6

9.8
11.9

SUB6608

6600

233

71.0

13.8

SUB7908

7900

278

84.8

16.5

SUB9008

9000

320

97.6

18.8

SUB10408

10400

368

112.2

21.7

SUB12808

12800

450

137.2

26.7

SUB14808

14800

520

158.5

30.8

SUB18008

18000

640

195.1

37.5

SUB4006

4000

147

44.8

6.7

SUB5106

5100

181

55.2

8.5

SUB5806

5800

207

63.1

9.7

SUB7106

7100

254

77.4

11.8

SUB8206

8200

293

89.3

13.7

SUB9806

9800

350

106.7

16.3

SUB11206

11200

402

122.6

18.7

SUB13006

13000

462

140.9

21.7

SUB15906

15900

566

172.6

26.5

Fire Sprinkler System
Freeze Protection

Heating cable
catalog number

Heating cable
output

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting Design

480 V

Roof and Gutter
De-Icing

600 V

Surface Snow
Melting – MI

Stairs

Anticipate and design for the addition of railings or other follow on construction that
will require cutting or drilling into the concrete as damage to installed heating cable
may occur. Allow for at least 4 in (10 cm) clearance between the heating cable and
any planned cuts or holes.

Freezer Frost
Heave Prevention

For stairs, select a heating cable from Table 4. Under the appropriate voltage,
select a cable from the shaded column with a length equal to or up to 20 ft (6.1 m)
longer than the calculated length from Step 3. Next, confirm that the watt density is
equal to, or greater than, the watt density determined from Step 2. If a cable of the
required length is not available, please contact your Pentair Thermal Management
representative for assistance in designing a custom heating cable.

Surface Snow
Melting – ElectroMelt

Example: Surface Snow Melting System for Stairs
208 V, single-phase (from Step 1)

Required watt density

45 W/ft2 (484 W/m2) (from Step 2)

Floor Heating

Supply voltage

Total heating cable length required 122 ft (37.2 m) (from Step 3)
SUB1

Cable wattage

3100 W

Cable voltage

208 V

Heating cable length

132 ft (40.2 m)

Number of cables

Installed watt density

55 W/ft2 (592 W/m2) (from Table 4)

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Heating cable catalog number

Surface snow melting – MI Mineral insulated Heating Cable System
Table 4 Selection Table for Concrete Stairs

Heating cable
catalog number

Heating cable
length

Watt density
3 runs cable 1
(W/ft2)

(W/m2)

2 runs cable 2
(W/ft2)

(W/m2)

Heating
cable
output

Heating
cable
current

(W)

(A)

(ft)

(m)

SUA5

12.2

431

–

550

4.6

SUA9

20.1

538

431

1100

9.2

120 V

208 V
SUA4

20.7

592

1600

7.7

SUA7

29.0

592

2300

11.1

SUB1

132

40.2

592

3100

14.9

SUB3

280

85.3

431

–

3900

18.8

SUB5

260

79.2

592

538

5500

26.4

SUB7

310

94.5

592

538

7000

33.7

SUB9

630

192.0

431

–

9000

43.3

240 V
SUA3

140

42.7

431

–

2000

8.3

SUB2

240

73.1

538

431

4000

16.7

SUB3

280

58.3

592

431

5200

21.7

SUB4

320

97.5

592

484

6000

25.0

SUB6

375

114.3

592

484

7500

31.3

SUB8

550

167.6

538

431

9000

37.5

SUB9

630

192.0

592

484

12000

50.0

277 V
SUA3

140

42.7

592

484

2740

9.9

SUB15

225

68.6

592

484

4250

15.3

SUB2

240

73.1

592

538

5300

19.1

SUB16

310

94.5

592

484

6180

22.3

SUB3

280

85.3

592

6850

24.7

SUB4

320

97.5

592

8000

28.9

SUB17

440

134.1

592

484

8700

31.4

SUB6

375

114.3

592

10200

36.8

SUB18

560

170.7

592

538

12000

43.3

480 V
SUB19

245

74.7

592

484

4700

9.8

SUB20

340

103.6

592

484

6450

13.4

SUB21

440

134.1

592

484

8700

18.1

SUB22

525

160.0

592

538

11000

22.9

225

68.6

592

431

4100

6.8

600 V
SUB11
SUB12

310

94.5

592

484

5800

9.7

SUB13

428

130.5

592

484

8000

13.3

SUB14

548

167.0

592

484

11000

18.3

1 Based on stairs with a depth of 10.5–12 in (27–30 cm) and 3 runs of cable
2 Based on stairs with a depth of less than 10.5 in (27 cm) and 2 runs of cable

Note: Type SUA cables supplied with 7 ft (2.1 m) cold lead. Type SUB cables supplied with 15 ft (4.6 m) cold leads. Tolerance on heating cable length is –0% to +3%.
To modify cold lead length, contact your Pentair Thermal Management sales representative.

146

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THERMAL MANAGEMENT SOLUTIONS

Wheel Tracks

Example: Surface Snow Melting System for Wheel Tracks
240 V, single-phase (from Step 1)

Wheel track length

28 feet (8.5 m)

Heating cable catalog number

SUB2

Cable wattage

4000 W

Cable voltage

240 V

Heating cable length

240 ft (73.1 m)

Number of cables

Roof and Gutter
De-Icing

Supply voltage

Table 5 Selection Table for Concrete and Asphalt Wheel Tracks

Wheel track length
(ft)

(m)

Normal
heat

High
heat

Spacing (cm)
Normal
heat

High
heat

Heating cable
length
(ft)

(m)

Heating
cable
output

Heating
cable
current

(W)

(A)

Surface Snow
Melting – MI

Heating
cable
catalog
number

Spacing
(inches)

208 V
SUA7

8 – 11

2.4 – 3.4

SUB1

12 – 15

3.5 – 4.6

132

Fire Sprinkler System
Freeze Protection

The heating cables shown in Table 5 will allow for four runs of cable in each wheel
track. Under the appropriate voltage, select a heating cable from the shaded column
for the wheel track length required. For wheel tracks outside the scope of this
design guide, please contact your Pentair Thermal Management representative for
assistance in designing a custom engineered heating cable.

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting Design

2300

11.1

40.2

3100

14.9

SUA8

16 – 21

4.7 – 6.4

177

2400

11.5

SUB5

22 – 31

6.5 – 9.5

260

79.2

5500

26.4

32 – 38

9.6 – 11.6

310

94.5

7000

33.7

39 – 46

11.7 – 14.0

375

114.3

5700

27.4

SUB8

47 – 68

14.1 – 20.7

550

167.7

6800

32.7

SUB9

69 – 78

20.8 – 23.8

630

192

9000

43.3

SUB10

79 – 88

23.9 – 26.8

717

218.5

13000

62.5

Surface Snow
Melting – ElectroMelt

SUB7
SUB6

240 V
SUA3

8 – 16

2.4 – 4.9

140

42.7

2000

8.3

SUA8

17 – 21

5.0 – 6.4

177

53.9

3200

13.3

22 – 29

6.5 – 8.8

240

73.1

4000

16.7

30 – 34

8.9 – 10.4

280

85.3

5200

21.7

SUB4

35 – 39

10.5 – 11.9

320

97.5

6000

SUB6

40 – 46

12.0 – 14.0

375

114.3

7500

31.3

SUB8

47 – 68

14.1 – 20.7

550

167.6

SUB9

69 – 78

20.8 – 23.8

630

192

12000

9000

SUB10

79 – 88

23.9 – 26.8

717

218.5

17000

70.8

Freezer Frost
Heave Prevention

SUB2
SUB3

37.5

277 V
11 – 16

3.4 – 4.9

140

42.7

2740

9.9

17 – 27

5.0 – 8.2

225

68.6

4250

15.3

SUB16

28 – 38

8.3 – 11.6

310

94.5

6180

22.3

SUB17

39 – 54

11.7 – 16.5

440

134.1

8700

31.4

SUB18

55 – 69

16.6 – 21.0

560

170.7

12000

43.3

SUB9 1

70 – 78

21.1 – 23.8

630

192

16400

59.2

Floor Heating

SUA3
SUB15

1 Not for asphalt applications; for use when embedded in concrete only

THERMAL MANAGEMENT SOLUTIONS

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Technical Data
Sheets

Surface snow melting – MI Mineral insulated Heating Cable System
Table 5 Selection Table for Concrete and Asphalt Wheel Tracks
Heating
cable
catalog
number

Wheel track length
(ft)

Spacing
(inches)
Normal
heat

(m)

High
heat

Heating cable
length

Spacing (cm)
Normal
heat

High
heat

(ft)

(m)

Heating
cable
output

Heating
cable
current

(W)

(A)

480 V
SUB19

20 – 29

6.1 – 8.8

245

74.7

4700

9.8

SUB20

30 – 41

8.9 – 12.5

340

103.6

6450

13.4

SUB21

42 – 54

12.6 – 16.5

440

134.1

SUB22

55 – 64

16.6 – 19.5

525

160

8700

18.1

11000

22.9

600 V
SUB11

20 – 27

6.1 – 8.2

225

68.6

4100

6.8

SUB12

28 – 38

8.3 – 11.6

310

94.5

5800

9.7

SUB13

39 – 52

11.7 – 15.9

428

130.5

SUB14

53 – 67

16.0 – 20.4

548

167

8000

13.3

11000

18.3

1 Not for asphalt applications; for use when embedded in concrete only
Note: Type SUA cables supplied with 7 ft (2.1 m) cold lead. Type SUB cables supplied with 15 ft (4.6 m) cold leads. Tolerance on
heating cable length is –0% to +3%.
To modify cold lead length, contact your Pentair Thermal Management sales representative.

Step 5 Determine heating cable spacing
surfaces

Determine the spacing between runs of heating cables using the formula below. For
concrete installations, do not exceed 10 in (25 cm) spacing of cable, and for asphalt
and paver installations do not exceed 6 in (15 cm) spacing. If the cable spacing for
asphalt or pavers exceeds 6 in (15 cm), contact your Pentair Thermal Management
representative for assistance.
To determine heating cable spacing required for surface snow melting
Cable spacing (in) =

Area (ft2) x 12 in
Heating cable length (ft)

Cable spacing (cm) =

Area (m2) x 100 cm
Heating cable length (m)

9. Complete the Bill
of Materials

Round to the nearest 1/2 in or nearest 1 cm to obtain cable spacing.
Note: If a large area has been divided into subsections or if a three-phase
voltage supply is used, the area in the above equations will be the subsection area
and the heating cable length will be the length of the cable selected for the
subsection area.

148

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THERMAL MANAGEMENT SOLUTIONS

Example: Surface Snow Melting System
180 ft2 (16.7 m2) (from Step 3)

Heating cable catalog number

SUB20 (from Step 4)

Heating cable length

340 ft (103.6 m) (from Step 4)

Cable spacing

(180 ft2 x 12 in) / 340 ft = 6.4 in
Rounded to 6.5 in

(16.7 m2 x 100 cm) / 103.6 m = 16.1 cm
Rounded to 16 cm

Fire Sprinkler System
Freeze Protection

Subsection area

Stairs

Example: Surface Snow Melting System for Stairs
SUB1 (from Step 4)

Stair depth

11 in (28 cm) (from Step 1)

Cable spacing – stairs

3 runs per stair spaced as described above

Cable spacing – landing

4.5 in (11.5 cm)

For wheel tracks, use the spacing shown in Selection Table for Concrete and Asphalt
Wheel Tracksfor “Normal” or “High” heat. Use the spacing for “High heat” for all
asphalt applications, or where a watt density of 45 W/ft2
(484 W/m2) or higher is required.
Example: Surface Snow Melting System for Wheel Tracks
Asphalt (from Step 1) – high heat required

Heating cable catalog number

SUB2 (from Step 4)

Cable spacing

4 in (10 cm) (from Table 5)

Freezer Frost
Heave Prevention

Paving material

Surface Snow
Melting – ElectroMelt

Wheel Tracks

Surface Snow
Melting – MI

For attached landings, space heating cables 4.5 in (11.5 cm) apart; up to 20 ft
(6.1 m) of excess cable may be used up in the landing, decreasing cable spacing as
necessary to accommodate the extra cable.

Roof and Gutter
De-Icing

For concrete stairs with a depth of 10.5–12 in (27–30 cm), use three runs of cable
with one run 2 to 3 in (5–7.5 cm) maximum from the front edge of the stair (this is
where snow and ice build-up is the most dangerous) and the remaining two runs
spaced equally apart from this run of cable. For stairs with a depth of less than
10.5 in (27 cm), use two runs of cable with one run 2 to 3 in (5–7.5 cm) maximum
from the front edge of the stair and the second run spaced 4 in (10 cm) from this run
of cable. Up to 20 ft (6.1 m) of excess cable may be used up in an attached landing,
preferably, or by adding an extra run to one or more stairs.

Heating cable catalog number

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting Design

Floor Heating

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Surface snow melting – MI Mineral insulated Heating Cable System
Surface Snow Melting
1. Determine design
conditions
2. Determine the
required watt density
3. Determine the total
area to be protected
4. Select the heating
cable
5. Determine heating
cable spacing
6. Determine the
electrical parameters
7. Select the control
system and power
distribution
8. Select the
accessories
9. Complete the Bill
of Materials

Step 6 Determine the electrical parameters
DETERMINE NUMBER OF CIRCUITS

For single phase circuits, individual heating cables are generally connected to
separate circuit breakers. Multiple heating cables may be connected in parallel
to reduce the number of circuits with permission from the Authority Having
Jurisdiction. The single-phase heating cable current is shown in the appropriate
selection table.
For three-phase circuits used in snow melting systems, the three heating cables
are generally connected in the Delta configuration shown in Fig. 11 on page 156.
Heating cables may also be connected using the Wye configuration shown in
Fig. 12 on page 157, but this configuration is less common. For both Delta and Wye
configurations, each set of three equal cables form a single circuit.
SELECT BRANCH CIRCUIT BREAKER

The safety and reliability of any snow melting system depends on the quality of
the products selected and the manner in which they are installed and maintained.
Incorrect design, handling, installation, or maintenance of any of the system
components could damage the snow melting system and may result in inadequate
snow melting, electric shock, or fire. To minimize the risk of fire, Pentair Thermal
Management and national electrical codes require a grounded metallic covering
on all heating cables. Pentair Thermal Management, agency certifications, and
national electrical codes require a grounded metallic covering on all heating cables.
They also require that all heating cables be protected with ground-fault equipment
protection.
WARNING: To minimize the danger of fire from sustained electrical arcing if
the heating cable is damaged or improperly installed, and to comply with the
requirements of Pentair Thermal Management, agency certifications, and national
electrical codes, ground-fault equipment protection must be used on each heating
cable branch circuit. Arcing may not be stopped by conventional circuit protection.
The power output and heating cable current draw for the snow melting cables are
shown in Table 2 through Table 5.
For single-phase circuits, the load current must not exceed 80% of the circuit
breaker rating.
Load current = Heating cable current (for a single circuit)
Circuit breaker rating = Load current x 1.25
For a Delta connected three-phase circuit, shown in Fig. 11 on page 156, the load
current can be determined by multiplying the heating cable current times 1.732 and
it must not exceed 80% of the 3-pole circuit breaker rating.
Load current = Heating cable current x 1.732 (for a single Delta connected circuit)
Circuit breaker rating = Load current x 1.25
For a Wye connected three-phase circuit, shown in Fig. 12 on page 157, the load
current is the same as the heating cable current and it must not exceed 80% of the
3-pole circuit breaker rating.
Load current = Heating cable current (for a single Wye connected circuit)
Circuit breaker rating = Load current x 1.25
Record the number and ratings of the circuit breakers to be used. Use ground-fault
protection devices (GFPDs) for all applications. For three-phase circuits, ground fault
may be accomplished using a shunt trip 3-pole breaker and a ground fault sensor.
Circuit breaker rating (A) ___________

150

EN-PyrotenaxMISurfaceSnowMelting-DG-H57045

Number of circuit breakers ___________

11/13

THERMAL MANAGEMENT SOLUTIONS

Determine Transformer Load

The total transformer load is the sum of the loads in the system. Calculate the Total
Transformer Load as follows:

Fire Sprinkler System
Freeze Protection

For cables of equal wattage:
Cable (W) x Number of cables

Transformer load (kW) =

1000

When cable wattages are not equal:
Transformer load (kW) =

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting Design

Cable1 (W) + Cable2 (W) + Cable3 (W)... + CableN (W)
1000

Roof and Gutter
De-Icing

Example: Surface Snow Melting System
SUB20 (from Step 4)

Heating cable current

13.4 A (from Table 2)

Load current

13.4 x 1.732 = 23.2 A

Circuit breaker rating

30 A breaker, 80% loading 24 A

Number of circuit breakers

Cable power output

6450 W (from Step 4)

Number of cables

3 (from Step 4)

Total transformer load

(6450 W x 3) / 1000 = 19.4 kW

Surface Snow
Melting – MI

Heating cable catalog number

Example: Surface Snow Melting System for Stairs
SUB1 (from Step 4)

Heating cable current

14.9 A (from Table 4)

Load current

14.9 A

Circuit breaker rating

20 A breaker, 80% loading 16 A

Number of circuit breakers

Cable power output

3100 W (from Step 4)

Number of cables

1 (from Step 4)

Total transformer load

3100 W / 1000 = 3.1 kW

Surface Snow
Melting – ElectroMelt

Heating cable catalog number

Example: Surface Snow Melting System for Wheel Tracks
Heating cable current

16.7 A (from Table 5)

Load current

16.7 A

Circuit breaker rating

30 A breaker, 80% loading 24 A

Number of circuit breakers

Cable power output

4000 W (from Step 4)

Number of cables

1 (from Step 4)

Total transformer load

4000 W / 1000 = 4.0 kW

11/13

151

Technical Data
Sheets

EN-PyrotenaxMISurfaceSnowMelting-DG-H57045

Floor Heating

SUB2 (from Step 4)

Freezer Frost
Heave Prevention

THERMAL MANAGEMENT SOLUTIONS

Heating cable catalog number

Step 7 Select the control system and power distribution
Control System

Select a control system from the following three options keeping in mind that an
automatic snow melting controller offers the highest system reliability and the
lowest operating cost.
• Manual on/off control
• Slab sensing thermostat

5. Determine heating
cable spacing

• Automatic snow melting controller

6. Determine the
electrical parameters

If the current rating of the control means is exceeded, all three methods will require
contactors sized to carry the load. Each method offers a tradeoff, balancing initial
cost versus energy efficiency and ability to provide effective snow melting. If the
system is not energized when required, snow will accumulate. If the system is
energized when it is not needed, there will be unnecessary power consumption.
Choose the control method that best meets the project performance requirements.
For additional information, refer to “Power Distribution” on page 156 or contact your
Pentair Thermal Management representative for details.

7. Select the control
system and power
distribution
8. Select the
accessories
9. Complete the Bill
of Materials

Manual On/Off Control
A manually controlled system is operated by a switch that controls the system power
contactor. This method requires constant supervision to work effectively. A manual
system can be controlled by a building management system.
Slab Sensing Thermostat
A slab sensing thermostat can be used to energize the system whenever the slab
temperature is below freezing, but is not energy efficient when used as the sole
means of control. The slab sensing thermostat is recommended for all snow melting
applications, even when an automatic snow controller is used, and is required for
all asphalt and paver installations (for asphalt, it prevents surface damage due
to overheating). The snow melting controllers shown in Table 4 include a slab
temperature sensor.
Automatic Snow Melting Controller
With an automatic snow melting controller, the snow melting system is automatically
energized when both precipitation and low temperature are detected. When
precipitation stops or the ambient temperature rises above freezing, the system
is de-energized. In addition, a slab sensor de-energizes the system when the slab
temperature reaches the slab sensor set point even if freezing precipitation is still
present. Using an automatic snow controller with a slab sensor offers the most
energy-efficient control solution. For additional information, refer to Fig. 10.
For areas where a large number of circuits are required, the DigiTrace ACS-30 can
be used. The Surface Snow Melting control mode in the ACS-30 includes an External
Device control option. This option allows a Snow/Moisture sensing controller
(from Table 6) to be integrated into the ACS-30 system. Note that sensors (snow
or gutter) cannot be directly connected to the ACS-30 system. Refer to the ACS-30
Programming Guide (H58692) for more information on system setup.

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Optional
RCU-3 or RCU-4
remote control unit

CIT-1
snow sensor

To additional
SC-40C satellite
contactors

Fire Sprinkler System
Freeze Protection

Optional
SC-40C
satellite
contactor

SIT-6E pavement
mounted sensor

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting Design

To power supply
To heating cable(s)

Roof and Gutter
De-Icing

APS-4C (shown) with SC-40C satelllite
contactor or APS-3C snow controller
Note: APS-4C, APS-3C
and SC-40C include an
integral high limit
temperature sensor

Fig. 10 Automatic snow melting control system

Catalog number

Description

Slab Sensing Thermostat and Accessory
ECW-GF

ECW-GF-DP

ETI PD Pro

ETI GF Pro

Freezer Frost
Heave Prevention

An optional remote display panel (ECW-GF-DP) that can be added to provide groundfault or alarm indication in applications where the controller is mounted in inaccessible locations.

Surface Snow
Melting – ElectroMelt

An optional ground-fault display panel (ECW-GF-DP) that can be added to provide
ground-fault or alarm indication in applications where the controller is mounted in
inaccessible locations.

Surface Snow
Melting – MI

Table 6 Control Systems

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Floor Heating

Features a built-in 30-mA, self-testing Ground-Fault Equipment Protection (GFEP)
capability, digitally filtered to minimize false tripping. A ground-fault alarm must be
manually reset using the Test/Reset switch before heater operation can continue.

Surface snow melting – MI Mineral insulated Heating Cable System
Table 6 Control Systems
Catalog number

Description

MI-GROUND-KIT

Grounding kit for nonmetallic enclosures.

Automatic Snow Melting Controllers
APS-3C

Automatic snow melting controller housed in a Type 3R enclosure provides effective,
economical automatic control of all snow melting applications. Features include:
120 V or 208–240 V models, 24-A DPDT output relay and an adjustable hold-on timer.
Enclosure dimensions: 11-1/2 in x 9-1/8 in x 6-9/16 in (292 mm x 232 mm x 167 mm)

APS-4C

Automatic snow melting controller housed in a Type 3R enclosure provides effective,
economical automatic control of all snow melting applications. The APS-4C can operates with any number of SC-40C satellite contactors for larger loads. Features include:
277 V single-phase or 208–240, 277/480, and 600 V three-phase models, built-in 3-pole
contactor, integral 30 mA ground-fault circuit interrupter and an adjustable hold-on
timer.
Enclosure dimensions: 11-1/2 in x 9-1/8 in x 6-9/16 in (292 mm x 232 mm x 167 mm)

SC-40C

Snow Melting Sensors and Accessories

154

CIT-1

Overhead snow sensor that detects precipitation or blowing snow at ambient temperatures below 38°F (3.3°C). For use with either an APS-3C or APS-4C automatic snow
melting controller.

SIT-6E

Pavement-mounted sensor signals for the heating cable to turn on when the
pavement temperature falls below 38°F (3.3°C) and precipitation in any form is
present. Microcontroller technology effectively eliminates ice bridging while ensuring
accurate temperature measurement. For use with either an APS-3C or APS-4C
automatic snow melting controller.

RCU-3

The RCU–3 provides control and status display to the APS–3C controller from a remote
location. It has a 2, 4, 6 or 8 hour CYCLE TIME adjustment, independent of APS-3C
setting.

RCU-4

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Table 6 Control Systems
Catalog number

Description

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting Design

Electronic Controllers

ProtoNode-LER
ProtoNode-RER

The DigiTrace ProtoNode is an external, high performance multi-protocol gateway for
customers needing protocol translation between Building Management Systems (BMS)
and the DigiTrace ACS-30 or C910-485 controllers.

PROTOCESSOR
SERIAL ETHERNET

PROTONODE

B0
B1
B2
B3
S0
S1
S2
S3

By FieldServer Technologies
www.ProtoCessor.com

RS 485 GND
RS 485 RS 485+

The ProtoNode-LER is for LonWorks® systems; and the ProtoNode-RER is for
BACnet® or Metasys® N2 systems.

+PWR
- PWR
FRAME GND

Stainless steel jacketed three-wire RTD (Resistance Temperature Detector) used with
DigiTrace C910-485 and ACS-30 controllers.
RTD10CS: 10-ft (3 m) flexible armor, with 18-in (457 mm) lead wire and 1/2-inch NPT
bushing.
RTD-200: 6-ft (1.8 m) fluoropolymer with 1/2-in NPT bushing.
RTD50CS: 50-ft (3 m) flexible armor with 1/2-in NPT bushing

Surface Snow
Melting – MI

RTD10CS
RTD-200
RTD50CS

Roof and Gutter
De-Icing

The DigiTrace ACS-30 Advanced Commercial Control System is a multipoint
electronic control and monitoring system for heat-tracing used in various commercial
applications such as pipe freeze protection, roof and gutter de-icing, surface snow
melting, hot water temperature maintenance and floor heating. The DigiTrace ACS-30
system can control up to 260 circuits with multiple networked ACS-PCM2-5 panels,
with a single ACS-UIT2 user interface terminal. The ACS-PCM2-5 panel can directly
control up to 5 individual heat-tracing circuits using electromechanical relays rated at
30 A up to 277 V.

Fire Sprinkler System
Freeze Protection

A0
A1
A2
A3
A4
A5
A6
A7

ACS-UIT2
ACS-PCM2-5

Surface Snow
Melting – ElectroMelt
Freezer Frost
Heave Prevention
Floor Heating

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Surface snow melting – MI Mineral insulated Heating Cable System
Power Distribution

Three-phase, 4-wire voltage supplies such as 208 V, 480 V, and 600 V are commonly
used for snow melting applications, especially for large areas. Designing the snow
melting system using a three-phase voltage supply results in a balanced heating
system load, since three identical cables are used in each circuit. In addition, since
three cables are used in each circuit, the result is a system with fewer circuits. For
small areas, it may not be possible to select three cables, and one or two heating
cables, single-phase connected, must be used.
The Delta wiring configuration shown in Fig. 11 is commonly used for three-phase
snow melting circuits. Each circuit comprises three heating cables of equal wattage
and connected as shown.
Fig. 12 shows the less common Wye wiring configuration. In this case, the three
heating cables are also of equal wattage, but most important is that the heating
cable voltage must equal the phase-to-neutral supply voltage.

Ground

Supply power
480 V, 3Ø, 4 W
B

Control power CIT-1
120 V
Snow sensor

MCB

15 A
Up to
2000 ft

3-pole contactor
120 volt coil

C
APS-3C

Snow/Ice Melting
Controller

APS
blakgb
bllfkldffd
fjsosfnfloo
dl;gffglf

20 A

3-pole circuit
breaker with shunt
trip/external ground
fault sensor

Slab temperature
sensor

20 A

APS-3C
Automatic snow
controller

To ground
fault module

Ground fault
sensor
B

480 V

Heating
cable sheath,
braid or ground

Note: For Delta connected heating
cables, the current in the supply
feeder, contactor, and breaker is equal
to the “Heating Cable Current” x 1.732.

480 V

Fig. 11 Typical three-phase DELTA connected heating cables with automatic snow melting
controller

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Ground A

Supply power
480 V, 3Ø, 4 W
B

Control power
CIT-1
120 V
Snow sensor

C
MCB

Fire Sprinkler System
Freeze Protection

3-pole contactor
120 volt coil

15 A

Up to
2000 ft

C
APS-3C

Snow/Ice Melting
Controller

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting Design

APS
blakgb
bllfkldffd
fjsosfnfloo
dl;gffglf

20 A

Slab temperature
sensor

20 A

APS-3C
Automatic snow
controller

Roof and Gutter
De-Icing

3-pole circuit
breaker with shunt
trip/external groundfault sensor

To ground
fault module

Ground fault
sensor
B

Surface Snow
Melting – MI

Heating cable
sheath, braid
or ground

277 V
N

277 V

277 V
A

Note: For Wye connected heating
cables, the current in the supply
feeder, contactor, and breaker is equal
to the “Heating Cable Current.”

Freezer Frost
Heave Prevention

Connecting heating cables in Delta or Wye configuration using three-phase voltage
supplies reduces the number of circuits required because three heating cables
are used in each circuit. For example, if you select three heating cables to operate
on 480 V, single-phase (i.e. 480 V across each cable), you need three 2-conductor
feeders, three 2-pole contactors, and three 2-pole breakers (i.e. three circuits)
as shown in Fig. 13. If the same three heating cables are connected in Delta
configuration to the 480 V, three-phase supply, you need one 3-conductor feeder,
one 3-pole contactor, and one 3-pole breaker (i.e. one circuit) as shown in Fig. 11. In
addition, decreasing the number of circuits will reduce the cost of the distribution
system.

Surface Snow
Melting – ElectroMelt

Fig. 12 Typical three-phase WYE connected heating cables with automatic snow melting
controller

Floor Heating

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Surface snow melting – MI Mineral insulated Heating Cable System
C
Supply
B
voltage
A
Ground
C

Contactor

Breaker

Cable 2

Cable 1

Cable 3
Heating cable
sheath, braid
or ground

Fig. 13 Simplified single-phase connected heating cables
Single Circuit Control

Heating cable circuits that do not exceed the current rating of the selected controller
can be switched directly. Fig. 14 shows a typical single-phase circuit where the
heating cable is controlled by a thermostat. When the total electrical load exceeds
the rating of the controller or if a single-pole controller is used to control a threephase circuit, an external contactor is required. In Fig. 11 and Fig. 12, the snow
melting controller is used to control the three-phase connected heating cables
through a contactor.

Heating cable
sheath, braid
or ground

Heating
cable
Temperature
controller

1 ø supply
N
1-pole
GFEP breaker
Ground

Fig. 14 Single circuit control
Group Control

Multiple single-phase or three-phase circuits may be activated by a single snow
melting controller or thermostat (group control).
The SMPG power distribution panel is designed to control snow melting circuits
installed in medium sized areas. This panel is available in single-phase (SMPG1) and
three-phase (SMPG3) versions and includes ground fault protection, monitoring, and
control for snow melting systems. The snow melting system is energized after the
integrated snow controller receives an input from any of the remote sensors.

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Mounting brackets
Nameplate

Snow/Ice
melt controller

Control power
transformer

EUR - 5A

Main breaker
(optional)

Power distribution
block
ground-fault
sensors

PDB

Alarm acknowledge
C.B. tripped alarm

GFS1

GFS2

GFS3 HTC

CB1

CB2

CB3

Fire Sprinkler System
Freeze Protection

HTC energized light
Power on light
Heater cycle
timed control

Heater thermostat (3R only)
Door lock
handle

Control wiring

Heat trace
contactor

Heater (3R only)

NP
NP

Ground bar

Branch
breakers
(3 pole)

Roof and Gutter
De-Icing

Exterior View

Interior View

Fig. 15 SMPG3 power distribution panel

Main circuit breaker (optional)

Fuse

GIT-1

EUR-5A SNOW SWITCH

24 V

AUTOMATIC SNOW/ICE MELTING CONTROL PANEL

Remote annunciation
alarm circuit breaker
with alarm type #3)
Three-pole
main contactor
Three-pole circuit breaker
with shunt trip/external
ground fault sensor

Slab
temperature sensor

Control transformer

SUPPLY
SNOW/ICE

HOURS
60°F
55°F

HEATER

Aerial
CIT-1 snow sensor

HEATER
CYCLE

50°F
45°F

65°F

70°F
75°F
80°F
85°F

TEMPERATURE

To ground fault module

Gutter
ice sensor

SIT-6E
Junction box
A1

Pavement-mounted
sensor
3 Ø Delta connected
heating cables

Ground

To ground fault module

Junction box

Heating
cables

3 Ø Wye connected
heating cables
Junction box

Ground

Terminal
block

Freezer Frost
Heave Prevention

Three-pole circuit breaker
with shunt trip/external
ground fault sensor
Current
transformers

Surface Snow
Melting – ElectroMelt

Heating
cable
sheath,
braid
or
ground

Current
transformers

Surface Snow
Melting – MI

N
Incoming
power
Ground

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting Design

Heating cable
sheath, braid
or ground

Fig. 16 Typical wiring diagram of group control with SMPG3
Floor Heating

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Surface snow melting – MI Mineral insulated Heating Cable System
Table 7 Power Distribution
Catalog number

Description

Power Distribution and Control Panels
SMPG1

Single-phase power distribution panel that includes ground-fault protection, monitoring, and control for snow melting systems. Single-phase voltages include 208 and 277 V.
Refer to the SMPG1 data sheet (H57680) for information on selecting a control panel.
If standard configurations do not meet your requirements, contact your Pentair Thermal
Management representative for a quotation on a custom SMPG1 panel.

NP
NP

SMPG3

Three-phase power distribution panel that includes ground-fault protection, monitoring, and control for snow melting systems. Three-phase voltages include 208, 480, and
600 V. Refer to the SMPG3 data sheet (H57814) for information on selecting a control
panel.

If standard configurations do not meet your requirements, contact your Pentair Thermal
Management representative for a quotation on a custom SMPG3 panel.

NP
NP
NP
NP
NP
NP

Contactors and Junction Boxes
E104

Three-pole, 100 A per pole, 600 V maximum contactor housed in UL Listed, CSA Certified, Type 4X enclosure with two 1-inch conduit entries. When ordering, select coil voltage (110–120, 208–240, 277 V).
Enclosure dimensions: 13-1/2 in x 9-1/5 in x 6-11/16 in (343 mm x 234 mm x 170 mm).

E304

Three-pole, 40 A per pole, 600 V maximum contactor housed in UL Listed, CSA Certified
Type 4X enclosure with two 1-inch conduit entries. When ordering, select coil voltage
(110–120, 208–240, 277 V).
Enclosure dimensions: 9-1/2 in x 7-1/5 in x 6-11/16 in (241 mm x 183 mm x 170 mm).

Example: Surface Snow Melting System
Automatic snow melting controller APS-4C
Quantity

Pavement-mounted sensor

SIT-6E

Quantity

Example: Surface Snow Melting System for Stairs
Slab sensing thermostat

ECW-GF

Quantity

Example: Surface Snow Melting System for Wheel Tracks
Automatic snow melting controller APS-4C

160

Quantity

Overhead snow sensor

CIT-1

Quantity

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Surface Snow Melting

Step 8 Select the accessories

2. Determine the
required watt density

We recommend using the following as appropriate.

3. Determine the total
area to be protected
4. Select the heating
cable
5. Determine heating
cable spacing

Fire Sprinkler System
Freeze Protection

A typical Pyrotenax snow melting system consists of several accessories. All of the
accessories work together to provide a safe and reliable snow melting system that is
easy to install and maintain.

1. Determine design
conditions

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting Design

6. Determine the
electrical parameters

Roof and Gutter
De-Icing

7. Select the control
system and power
distribution
8. Select the
accessories
9. Complete the Bill
of Materials

Table 8 Accessories
Description

Standard
packaging

Usage

HARD-SPACERGALV-25MM25M

Galvanized steel prepunched strapping

82 ft (25 m)
rolls

No. rolls = 0.005 x area (ft2)
No. rolls = 0.05 x area (m2)

HARD-SPACERSS-25MM-25M

Stainless steel prepunched strapping

82 ft (25 m)
rolls

No. rolls = 0.005 x area (ft2)
No. rolls = 0.05 x area (m2)

SMCS

Snow melt caution sign
Dimensions 6 x 4 in (150 x 100 mm)

1 minimum per system

Freezer Frost
Heave Prevention

A cast aluminum junction box (Type 3) for
installation in nonhazardous and CID2 locations. Three 1/2" NPT entries on bottom,
provided with plugs. Includes 4-pole terminal block (CSA - 600 V, 65 A, 18 - 6 AWG;
UL - 300 V, 65 A, 18 - 6 AWG). External
mounting feet. CSA approved for Class I,
Div. 2, Groups A, B, C, and D.

Surface Snow
Melting – ElectroMelt

D1297TERM4

Surface Snow
Melting – MI

Catalog
number

Enclosure dimensions: 6 in x 6 in x 4 in
(150 mm x 150 mm x 100 mm).

Floor Heating

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Surface snow melting – MI Mineral insulated Heating Cable System
Example: Surface Snow Melting System
Junction box

Contractor supplied

Prepunched strapping 1 HARD-SPACER-GALV-25MM-25M
Quantity 3
Snow melt caution sign

SMCS

Quantity 2
1

Only required for two-pour slab construction

Example: Surface Snow Melting System for Stairs
Junction box

D1297TERM4

Quantity 1
Prepunched strapping 1 HARD-SPACER-GALV-25MM-25M
Quantity

Snow melt caution sign

SMCS

Quantity 1
1

Only required for two-pour slab construction

Example: Surface Snow Melting System for Wheel Tracks
Junction box

D1297TERM4

Quantity 1
Prepunched strapping 1 HARD-SPACER-GALV-25MM-25M
Quantity 1
Snow melt caution sign

SMCS

Quantity 1
1

Surface Snow Melting
1. Determine design
conditions
2. Determine the
required watt density

Only required for two-pour slab construction

Step 9 Complete the Bill of Materials
If you used the Design Worksheet to document all your design parameters, you
should have all the details you need to complete the Bill of Materials.

3. Determine the total
area to be protected
4. Select the heating
cable
5. Determine heating
cable spacing
6. Determine the
electrical parameters
7. Select the control
system and power
distribution
8. Select the
accessories
9. Complete the Bill
of Materials

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Pyrotenax MI System Surface Snow Melting Design Worksheet
Step  Determine design conditions

T Surface snow melting
Geographical location:
_______________________

Paving material
T Concrete
T Asphalt
T Pavers

Size and layout

Supply
voltage

Phase

Control method

Slab surface area (ft2 / m2):_____________

T 120 V

T Single-phase

Ramp surface area (ft2 / m2):___________

T 208 V

T Three-phase

T Automatic snow melting
controller

Stairs

T 240 V

T Slab-sensing thermostat

T 277 V

T Manual on/off control

Number of stairs:

______________

Stair width (ft/m):

______________

Riser height (in/cm):

______________

Stair depth (in/cm):

______________

T 480 V
T 600 V

Roof and Gutter
De-Icing

Landing surface area (ft2 / m2):________

T 347 V

Wheel tracks
Track length (ft/m):

______________

Concrete joints:

______________

Surface drains:

______________

Fire Sprinkler System
Freeze Protection

Application and
environment

Pipe Freeze Protection
and Flow Maintenance

Pyrotenax MI System Surface Snow Melting Design Worksheet

Location of area structures:____________
Other information as appropriate:
____________________________________
____________________________________

Surface Snow
Melting – MI

____________________________________
Example:
0 Surface snow melting

Ramp surface: 45 ft x 12 ft

0 480 V

0 Three-phase 0 Automatic snow

melting controller

0 Philadelphia, PA
0 Concrete ramp

Step  Determine the required watt density
Paving material:
_______________________________

Surface Snow
Melting – ElectroMelt

Surface snow melting system for slabs, ramps, stairs, and wheel tracks: See Table 1
Geographical location:
_______________________________

Required watt density:
_______________________________

Example: Surface Snow Melting System

Ramp surface
Geographical location: Philadelphia, PA (from Step 1)
Paving material:

Concrete (from Step 1)
Freezer Frost
Heave Prevention

Required watt density: 35 W/ft2 (from Table 1)

Floor Heating

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Surface snow melting – MI Mineral insulated Heating Cable System
Step  Determine the total area to be protected
Total ramp/slab surface area
x

Length (ft/m)

Width (ft/m)

Surface area to be protected (ft2/m2)

For large areas and areas using a three-phase voltage supply
Length (ft/m)

/ No. of subsections =

Length of each
subsection (ft/m)

Width (ft/m)

Subsection area to be protected (ft2/m2)

Note: For three-phase voltage supplies, use multiples of three equal subsections.

Example: Surface Snow Melting System
Ramp
Calculate the surface area of the ramp for three-phase application
45 ft

/ 3 =

Length (ft)

15 ft
Length of each subsection (ft)

12 ft
Width (ft)

180 ft2
Subsection area to be protected (ft2)

Stairs
Calculate the heating cable needed for stairs and landing
Determine the number of cable runs needed
Stair depth:
< 10.5 in (27 cm): 2 cable runs
Stair depth:
10.5–12 in (27–30 cm): 3 cable runs
Cable runs needed:
Calculate the heating cable length for stairs
No. of stairs

x [(

No. runs per stair

Stair width (f/m)

) + (2 x

)] =
Riser height (ft/m)

Length of cable for stairs (ft/m)

Landing (attached to stairs)
Calculate the heating cable length for landing
(

x 12) / 4.5

Landing area (ft2)

(

Length of cable for attached landing (ft)

x 1000) / 115 =

Landing area (m2)
Length of cable
for stairs (ft/m)

Length of cable
for landing (ft/m)

Length of cable for attached landing (m)
=

Total heating cable length required (ft/m)

Wheel tracks
Wheel track length:

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Step  Select the heating cable
Surfaces: See Table 2 and Table 3.
(from Step 1)

Required watt density:

(from Step 2)

Subsection area:

(from Step 3)

Watt density (W/ft2) (W/m2)

Area (ft2/m2)

Fire Sprinkler System
Freeze Protection

Supply voltage:

Pipe Freeze Protection
and Flow Maintenance

Pyrotenax MI System Surface Snow Melting Design Worksheet

Required watts for area (W)

Heating cable catalog number:
Cable wattage:

Roof and Gutter
De-Icing

Cable voltage:
Heating cable length:
Number of cables = Number of subsection areas

Example: Surface Snow Melting System
Supply voltage:

480 V, three-phase (from Step 1)
35 W/ft2 (from Step 2)
180 ft2 (from Step 3)

Required watts (for each subsection):

35 W/ft2 x 180 ft2 = 6300 W

Heating cable catalog number:

SUB20

Cable wattage:

6450 W

Cable voltage:

480 V (for cables connected in Delta configuration)

Heating cable length:

340 ft

Number of cables:

3 (one cable required for each subsection)

Surface Snow
Melting – MI

Required watt density for ramp:
Subsection area (for 3 equal areas):

______________________________________ (from Step 1)
______________________________________ (from Step 2)
______________________________________ (from Step 3)
______________________________________
______________________________________
______________________________________
______________________________________
______________________________________
______________________________________ (from Table 4)

Freezer Frost
Heave Prevention

Supply voltage:
Required watt density:
Total heating cable length required:
Heating cable catalog number:
Cable wattage:
Cable voltage:
Heating cable length:
Number of cables:
Installed watt density:

Surface Snow
Melting – ElectroMelt

Stairs: See Table 4

Wheel Tracks: See Table 5
______________________________________ (from Step 1)
______________________________________
______________________________________
______________________________________
______________________________________
______________________________________
______________________________________

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Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating

Supply voltage:
Wheel track length:
Heating cable catalog number:
Cable wattage:
Cable voltage:
Heating cable length:
Number of cables:

Surface snow melting – MI Mineral insulated Heating Cable System
Step  Determine the heating cable spacing
Surfaces
Imperial (
Surfaces Surface area (ft2)

x 12 in) /

Imperial
Metric ((
Surface area (ft2)
Surface area (m2)

x 12 in) /
x 100 cm) /

Heating cable length (ft)
Heating cable length (ft)
Heating cable length (m)

in or
1 cm
Metric ( Round to the nearest x1/2100
cm)
/ to obtain cable spacing.
Surface area (m2)
Heating cable length (m)

=
=
=
=

Heating cable spacing (in)
Heating cable spacing (in)
Heating cable spacing (cm)
Heating cable spacing (cm)

Example: Surface Snow Melting System
Round to the nearest 1/2 in or 1 cm to obtain cable spacing.
Subsection area:
180 ft2 (from Step 3)

Cable spacing
Heating
cable catalog number:
180 ft2
Heating cable length:
(
Cable spacing
Surface area (ft2)
(

180 ft

SUB20 (from Step 4)

340 ft
340 ft (from Step 4)
x 12) /
Heating cable length (ft)

Surface area (ft )
2

x 12) /

340 ft
Heating cable length (ft)

=
=

6.4 in rounded to 6.5 in
Heating cable spacing (in)
6.4 in rounded to 6.5 in
Heating cable spacing (in)

Stairs
Stair depth:
Cable spacing – stairs:
Cable spacing – landing:

______________________________________ (from Step 1)
______________________________________ (refer to Step 5)
______________________________________ (refer to Step 5)

Wheel Tracks: See Table 5
Paving material:
Heating cable catalog number:
Cable spacing:

______________________________________ (from Step 1)
______________________________________ (from Step 4)
______________________________________ (refer to Step 5)

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Step  Determine the electrical parameters
Determine circuit breaker rating and number of circuits

Fire Sprinkler System
Freeze Protection

Number of circuit breakers

Circuit breaker rating (A)
For single-phase circuit

Load current = Heating cable current (from selection tables)
(

Load current (A)

x 1.25 ) =
Minimum circuit breaker rating (A)

Pipe Freeze Protection
and Flow Maintenance

Pyrotenax MI System Surface Snow Melting Design Worksheet

Circuit breaker rating (A)

For Delta connected three-phase circuit
Roof and Gutter
De-Icing

Load current = Heating cable current (from selection tables) x 1.732
(

Load current (A)

x 1.25 ) =
Minimum circuit breaker rating (A)

Circuit breaker rating (A)

For Wye connected three-phase circuit
Load current = Heating cable current (from selection tables)

Load current (A)

x 1.25 ) =
Minimum circuit breaker rating (A)

Surface Snow
Melting – MI

(

Circuit breaker rating (A)

Determine transformer load
For cables of equal wattage
(

Cable (W)

Number of cables

) / 1000

Transformer load (kW)

(

Cable1 (W)

Cable2 (W)

Cable3 (W)...

CableN (W)

) / 1000

Surface Snow
Melting – ElectroMelt

When cable wattages are not equal

Transformer load (kW)

Example: Surface Snow Melting System
For Delta connected three-phase circuit

(

SUB20 (from Step 4)

Number of heating cables:

3 (from Step 4)

Cable power output:

6450 W (from Step 4)

Load current:

13.4 A (from Table 2) x 1.732 = 23.2 A

23.2 A

29.0 A
x 1.25 ) =
Load current (A)
Minimum circuit breaker rating (A)
6450 W

3
Number of cables

EN-PyrotenaxMISurfaceSnowMelting-DG-H57045

Circuit breaker rating (A)
19.4 kW
Transformer load (kW)

11/13

167

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

) / 1000

30 A

Floor Heating

Cable (W)

Freezer Frost
Heave Prevention

(

Heating cable catalog number:

Surface snow melting – MI Mineral insulated Heating Cable System
Step  Select the control system and power distribution
Control Systems
See Table 6 Control Systems.

Thermostats, controllers and
accessories

Description

T ECW-GF

Electronic thermostat with 25-ft sensor

____________

T ECW-GF-DP

Remote display panel for ECW-GF

____________

T ETI PD Pro

____________

T MI-GROUND-KIT

Automatic snow and ice melting controller
Automatic snow and ice melting controller
Grounding kit for nonmetallic enclosures

T APS-3C

Automatic snow melting controller

____________

T APS-4C

Automatic snow melting controller

____________

T SC-40C

Satellite contactor

____________

T CIT-1

Overhead snow sensor

____________

T SIT-6E

Pavement-mounted sensor

____________

T RCU-3

Remote control unit for APS-3C

____________

T RCU-4

Remote control unit for APS-4C

____________

T ACS-UIT2

ACS-30 user interface terminal

____________

T ACS-PCM2-5

ACS-30 power control panel

____________

T ProtoNode-LER

Multi-protocol gateway

____________

T ProtoNode-RER

Multi-protocol gateway

____________

T RTD3CS

Resistance temperature device for DigiTrace ACS-30

____________

T RTD10CS

Resistance temperature device for DigiTrace ACS-30

____________

T RTD200

Resistance temperature device for DigiTrace ACS-30

____________

T RTD50CS

Resistance temperature device for DigiTrace ACS-30

____________

T ETI GF-Pro

Quantity

____________
____________

Power Distribution and Control Panels
See Table 7 Power Distribution.

Power distribution and control
panels

Description

Quantity

T SMPG1

Single-phase power distribution panel

____________

T SMPG3

Three-phase power distribution panel

____________

Contactors

Description

Quantity

T E104

Three-pole, 100 A per pole contactor

____________

T E304

Three-pole, 40 A per pole contactor

____________

Example: Surface Snow Melting System
0 APS-4C

Automatic snow melting controller

0 SIT-6E

Pavement-mounted sensor

1
1

Step  Select the accessories
See Table 8 Accessories.

Accessories

Description

Quantity

T HARD-SPACER-GALV-25MM-25M
T HARD-SPACER-SS-25MM-25M
T SMCS
T D1297TERM4

Galvanized steel prepunched strapping

____________
____________
____________
____________

Stainless steel prepunched strapping
Snow melt caution sign
Cast aluminum junction box

Example: Surface Snow Melting System
0

Junction box

(contractor supplied)

0 HARD-SPACER-GALV-25MM-25M1 Prepunched strapping

0 SMCS

Snow melt caution sign

1 Only required for two-pour slab construction

Step  Complete the Bill of Materials
Use the information recorded in this worksheet to complete the Bill of Materials.

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Pipe Freeze Protection
and Flow Maintenance
Freezer Frost
Heave Prevention

Raychem ElectroMelt heating cable systems can be used as a surface snow melting
system when installed in concrete pavement or under paving stones. It can also be
used as an anti-icing system but only when installed in concrete pavement.

Surface Snow
Melting – ElectroMelt

Introduction

Surface Snow
Melting – MI

Contents
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
How to Use this Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
Safety Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
System Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
Typical System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
Self-Regulating Heating Cable Construction. . . . . . . . . . . . . . . . . . . . . . . . . . 172
Approvals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
Surface Snow Melting and Anti-Icing Applications. . . . . . . . . . . . . . . . . . . . . . . . . . 173
Surface Snow Melting and Anti-Icing Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
Design Step by Step. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
Step 1 Determine design conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
Step 2 Select the heating cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
Step 3 Determine the required watt density . . . . . . . . . . . . . . . . . . . . . . . . 177
Step 4 Determine heating cable spacing. . . . . . . . . . . . . . . . . . . . . . . . . . . 179
Step 5 Determine the total area to be protected. . . . . . . . . . . . . . . . . . . . . 181
Step 6 Determine heating cable length. . . . . . . . . . . . . . . . . . . . . . . . . . . . 182
Step 7 Determine the electrical parameters. . . . . . . . . . . . . . . . . . . . . . . . 184
Step 8 Select the connection kits and accessories. . . . . . . . . . . . . . . . . . . 186
Step 9 Select the control system and power distribution. . . . . . . . . . . . . . 189
Step 10 Complete the Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
ElectroMelt System Surface Snow Melting and Anti-Icing Design Worksheet. . . . 196

Roof and Gutter
De-Icing

This step-by-step design guide provides the tools necessary to design a Raychem
ElectroMelt heating cable surface snow melting and anti-icing system. For other
applications or for design assistance, contact your Pentair Thermal Management
representative or phone Pentair Thermal Management at (800) 545‑6258. Also, visit
our web site at www.pentairthermal.com.

Fire Sprinkler System
Freeze Protection

Surface snow melting and
anti-icing – electromelt

Important: ElectroMelt is not approved for use in asphalt.

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating

If your application conditions are different, or if you have any questions, contact your
Pentair Thermal Management representative or contact Pentair Thermal
Management directly at (800) 545‑6258.

Surface snow melting and anti-icing – electromelt
How to Use this Guide
This design guide presents Pentair Thermal Management’ recommendations for
designing an ElectroMelt surface snow melting and anti-icing system. It provides
design and performance data, electrical sizing information, and heating-cable layout
suggestions. Following these recommendations will result in a reliable, energyefficient system.
Follow the design steps in the section “Surface Snow Melting and Anti-Icing Design,”
page 174 and use the “ElectroMelt System Surface Snow Melting and Anti-Icing
Design Worksheet,” page 196 to document the project parameters that you will
need for your project’s Bill of Materials.
Other Required Documents

This guide is not intended to provide comprehensive installation instructions. For
complete ElectroMelt surface snow melting system and anti-icing installation
instructions, please refer to the following additional required documents:
• ElectroMelt System Installation and Operation Manual (H58086)
• Additional installation instructions that are included with the connection kits,
thermostats, controllers and accessories
If you do not have these documents, you can obtain them from the Pentair Thermal
Management web site at www.pentairthermal.com.
For products and applications not covered by this design guide, please contact your
Pentair Thermal Management representative or call Pentair Thermal Management
directly at (800) 545-6258.
Safety Guidelines
As with any electrical equipment, the safety and reliability of any system depends
on the quality of the products selected and the manner in which they are installed
and maintained. Incorrect design, handling, installation, or maintenance of any of
the system components could damage the system and may result in inadequate
performance, overheating, electric shock, or fire. To minimize these risks and to
ensure that the system performs reliably, read and carefully follow the information,
warnings, and instructions in this guide.
This symbol identifies important instructions or information.

This symbol identifies particularly important safety warnings that must be
followed.
WARNING: To minimize the danger of fire from sustained electrical arcing if
the heating cable is damaged or improperly installed, and to comply with the
requirements of Pentair Thermal Management, agency certifications, and national
electrical codes, ground-fault equipment protection must be used on each heating
cable branch circuit. Arcing may not be stopped by conventional circuit protection.

Warranty
Pentair Thermal Management’ standard limited warranty applies to Raychem Snow
Melting Systems.
An extension of the limited warranty period to ten (10) years from the date of
installation is available, except for the control and distribution systems, if a properly
completed online warranty form is submitted within thirty (30) days from the date of
installation. You can access the complete warranty on our web site at
www.pentairthermal.com.

170

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System Overview

Typical System
A typical system includes the following:

Fire Sprinkler System
Freeze Protection

The Raychem ElectroMelt system provides surface snow melting and anti-icing for
concrete surfaces and pavers. The ElectroMelt system uses a self-regulating heating
cable that reduces heat output automatically as the pavement warms, resulting in
lower energy use, and eliminating the possibility of overheating. The system includes
heating cable, connection kits, junction boxes, a control system and sensors, power
distribution panels, and the tools necessary for a complete installation.

Pipe Freeze Protection
and Flow Maintenance

System Overview

• ElectroMelt self-regulating heating cable
Roof and Gutter
De-Icing

• Connection kits and accessories
• Snow controller and sensors
• Power distribution
Power Distribution Panel

Aerial Snow Sensor

Surface Snow
Melting – MI

Snow Controller
AP
AP
SS-4
4

Sno
w/Ic
e Me
ltin
gC
Con

ont

tr
roll
olle

err

SUP
HEA PLY
USE TER : 277
ONL : 37
3777 VAC
Y COP
VAC , 50/6
SEE SUF PER , 40 AMP0HZ
INS FICI CON . Z, 35V
TAL ENT DUC MAX A
LAT AMP TOR RES
ION ACI S
IS
INS TY. HAV
TRU
ING
CTIO
NS
DAN
Leth GER
qual al vol OF
ified tage

LEECT WAR
s
requpers are RICAL NIN
ired onne presen SHOG
to l only. t ben CK
de-e Mor
nerg e eath OR LCT
ize than this E ROC
this one cove
cont disc r. ServUTION
rol on icee
for nect
serv may by
icing
. be

SUP
PLY
SN
SNO

OW
W

HEA
TER
TER
GR
OU
ND
FAU

HEA
LT
TER
TER
CYC
RES
CYCL
LEE
ET
ET

TES
T GR
OU
ND
FAU
LT

HO
LD

TIM
E(HR
S)

Power Connection and End Seal

Surface Snow
Melting – ElectroMelt

Caution Sign

Pavement Snow Sensor

Heating Cable

Freezer Frost
Heave Prevention

Heating Cable Splice

Expansion Joint Kit

Floor Heating

Fig. 1 Typical ElectroMelt system

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Sheets

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Surface snow melting and anti-icing – electromelt
Self-Regulating Heating Cable Construction
The ElectroMelt self-regulating heating cable is embedded in concrete pavement
to melt snow and ice that might otherwise accumulate on the surface. The heating
cable responds to the local concrete temperature, increasing heat output when
concrete temperature drops and decreasing heat output when concrete temperature
rises. The self-regulating heating cable cannot overheat and destroy itself, even
if overlapped in the concrete, and therefore does not require the use of overlimit
thermostats.

Modified polyolefin outer jacket
Tinned-copper braid
Modified polyolefin inner jacket
Self-regulating conductive core
Nickel-plated copper bus wire

Fig. 2 ElectroMelt heating cable construction

At high temperature,
there are few conducting paths and output is
correspondingly lower,
conserving energy
during operation.

re
g
Se

Power

Constant wattage

lf-

At moderate temperature,
there are fewer conducting
paths because the heating
cable efficiently adjusts by
decreasing output, eliminating
any possibility of overheating.

Resistance

At low temperature,
there are many
conducting paths,
resulting in high output
and rapid heat-up. Heat
is generated only when it
is needed and precisely
where it is needed.

Constant wattage

lf-

re
g

ing

Temperature

Fig. 3 Self-regulating heating cable technology

172

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Approvals
The ElectroMelt surface snow melting and anti-icing system is UL Listed and CSA
Certified for use in nonhazardous locations.

Surface Snow Melting and Anti-Icing Applications
SURFACE SNOW MELTING

Surface snow melting systems prevent the accumulation of snow on ramps, slabs,
driveways, sidewalks, platform scales, and stairs under most snow conditions.

Fire Sprinkler System
Freeze Protection

-ws

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting and Anti-Icing Applications

Roof and Gutter
De-Icing

ANTI-ICING

Anti-icing systems keep the surface temperature above freezing at all times to
prevent ice formation. Anti-icing applications require a higher watt density and
longer hours of operation than a surface snow melting system.
Application Requirements and Assumptions

The design for a standard surface snow melting and anti-icing application is based
on the following:

The following are examples of applications not addressed in this design guide:

Surface Snow
Melting – ElectroMelt

For products and applications not covered by this guide, contact your Pentair
Thermal Management representative for design assistance. Using proprietary
computer modeling, Pentair Thermal Management can design the appropriate
system for these applications.

Surface Snow
Melting – MI

Heating cable
• Secured to reinforcement steel or
mesh
• Located 1 1/2 to 2 inches (4 to 6 cm)
below finished surface
Pavers
Heating cable
• Concrete pavers 1 to 1 1/2
• Secured to mesh
(2.5 to 4 cm) inches thick
• Embedded in concrete or mortar base
• Placed on concrete or mortar base on
below the pavers
grade

Reinforced Concrete
• 4 to 6 inches (10 to 15 cm) thick
• Placed on grade
• Standard density

• Concrete thinner than 4 inches (10 cm)
Freezer Frost
Heave Prevention

• Concrete thicker than 6 inches (15 cm)
• Lightweight concrete
• Concrete with pavers thicker than 1 1/2 inches (4 cm)
• Ramps and walkways with air below
• Concrete without reinforcement
• Retrofitting of heating cable to existing pavement
• Pavers composed of material other than concrete

Floor Heating

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Sheets

THERMAL MANAGEMENT SOLUTIONS

Surface snow melting and anti-icing – electromelt
Surface Snow Melting and Anti-Icing Design
This section details the steps necessary to design your application. The examples
provided in each step are intended to incrementally illustrate sample designs from
start to finish. As you go through each step, use the “ElectroMelt System Surface
Snow Melting and Anti-Icing Design Worksheet,” page 196 to document your project
parameters, so that by that end of this section you will have the information you need
for your Bill of Materials.
Design Step by Step
Your system design requires the following essential steps:

 Determine design conditions
 Select the heating cable
 Determine the required watt density
 Determine heating cable spacing
 Determine the total area to be protected
 Determine heating cable length
 Determine the electrical parameters
 Select the connection kits and accessories
 Select the control system and power distribution
 Complete the Bill of Materials

174

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Surface Snow Melting
and Anti-Icing

Step 1 Determine design conditions

1. Determine design
conditions

3. Determine the
required watt density

• Application (surface snow melting or anti-icing)
• Environment
–– For surface snow melting: Geographical location
–– For anti-icing: Minimum ambient temperature and average wind speed

4. Determine heating
cable spacing

• Paving material

5. Determine the total
area to be protected

• Size and layout

6. Determine heating
cable length

8. Select the connection
kits and accessories

–– Slab surface area
–– Ramp surface area
–– Stairs

Roof and Gutter
De-Icing

7. Determine the
electrical parameters

Fire Sprinkler System
Freeze Protection

2. Select the heating
cable

Collect the following information to determine your design conditions:

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting and Anti-Icing Design

-- Number of stairs
-- Width of stair

9. Select the control
system and
power distribution

-- Riser height

10. Complete the Bill
of Materials

-- Landing dimensions

-- Depth of stair
–– Wheel tracks

Surface Snow
Melting – MI

-- Track length
–– Concrete joints
–– Surface drains
–– Location of area structures
–– Other information as appropriate
• Supply voltage
• Automatic or manual control method

Surface Snow
Melting – ElectroMelt

Note: Drainage must be a primary concern in any snow melting system design.
Improper drainage can result in ice formation on the surface of the heated area once
the system is de-energized. Ice formation along the drainage path away from the
heated area may create an ice dam and prohibit proper draining. If your design
conditions may lead to drainage problems, please contact Pentair Thermal
Management Technical Support for assistance.
Prepare Scale Drawing

Freezer Frost
Heave Prevention

Draw to scale the snow melting area and note the rating and location of the voltage
supply. Include stairs and paths for melting water runoff. Show concrete joints,
P
Power connection
surface
drains,
and location of area structures including post installations for
railings,
permanent
benches, and flagpoles. Measurements for each distinct section
E
End
seal
of the
melting
application,
including stairs, will allow for an accurate system
S snow
Splice
design, including control configuration. Use these symbols to indicate the heating
cable expansion and crack-control joints:
Expansion joint
Crack-control joint

Floor Heating

Expansion joint kit
Fig. 4 Design symbols

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Sheets

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Surface snow melting and anti-icing – electromelt
Example: Surface Snow Melting System
Application

Surface snow melting

Geographical location

Buffalo, NY

Size and layout

80 ft x 50 ft (24.4 m x 15.2 m)

Paving material

Concrete slab

Stairs:
Number of stairs

Width of stair

5 ft (1.5 m)

Riser height

6 in (15 cm)

Depth of stair

12 in (30 cm)

Supply voltage

277 V

Phase

Single-phase

Control method

Automatic snow melting controller

Example: Anti-Icing System
Application

Anti-icing

Minimum ambient temperature

10°F (–12°C)

Average wind speed

20 mph (32 kmph)

Size and layout

80 ft x 50 ft (24.4 m x 15.2 m)

Paving material

Concrete slab

Stairs:
Number of stairs

Width of stair

5 ft (1.5 m)

Riser height

6 in (20 cm)

Depth of stair

12 in (30 cm)

Supply voltage

277 V

Phase Single-phase
Control method
Surface Snow Melting
and Anti-Icing
1. Determine design
conditions
2. Select the heating
cable
3. Determine the
required watt density
4. Determine heating
cable spacing
5. Determine the total
area to be protected
6. Determine heating
cable length
7. Determine the
electrical parameters
8. Select the connection
kits and accessories
9. Select the control
system and
power distribution
10. Complete the Bill
of Materials

176

Slab sensing thermostat

Step 2 Select the heating cable
Pentair Thermal Management offers the option of two self-regulating heating cables
with the ElectroMelt system. Cable selection is independent of application and
depends only upon supply voltage. ElectroMelt heating cables must only be powered
by single phase voltage. In applications where the power supply is three-phase, all
circuits must be wired to provide single-phase voltage to the heating cables. Select
the appropriate cable based on the supply voltage available for the application area.
Table 1 ElectroMelt Self-Regulating Heating Cable
Supply voltage

Catalog number

208 V, 240 V, 277 V

EM2-XR

347 V

EM3-XR

Example: Surface Snow Melting System
Supply voltage

277 V (from Step 1)

Heating cable

EM2-XR

Example: Anti-Icing System
Supply voltage

277 V (from Step 1)

Heating cable

EM2-XR

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Surface Snow Melting
and Anti-Icing

Step 3 Determine the required watt density

1. Determine design
conditions

3. Determine the
required watt density
4. Determine heating
cable spacing
5. Determine the total
area to be protected
6. Determine heating
cable length

8. Select the connection
kits and accessories
9. Select the control
system and
power distribution
10. Complete the Bill
of Materials

For maximum performance from any snow melting system, you must first take into
account the local snowfall and icing patterns. A system design that works well in one
city may be inadequate in another. The energy required to melt snow varies with air
temperature, wind speed, relative humidity, snow density, and the depth of the snow
on the pavement.
Table 2 summarizes the required watt density for most major cities in North
America based on typical minimum ambient temperatures and the snowfall and
icing patterns. Select the city from the list, or closest city, where similar climatic
conditions exist.

Roof and Gutter
De-Icing

7. Determine the
electrical parameters

Surface Snow Melting

Table 2 Required Watt Density for Surface Snow Melting
Watts/ft2
City

Watts/m2

Concrete

Pavers

Concrete

Pavers

35
35
40
35
35
35
35
35
50
35
35
50
35
45
35
35
35
35

40
40
45
40
40
40
40
40
50
35
40
50
40
50
40
35
35
40

377
377
431
377
377
377
377
377
538
377
377
538
377
484
377
377
377
377

431
431
484
431
431
431
431
431
538
377
431
538
431
538
431
377
377
431

Calgary, AB

484

Edmonton, AB
Fredericton, NB
Halifax, NS
Moncton, NB
Montreal, QC
Ottawa, ON
Prince George, BC
Quebec, QC
Regina, SK
Saskatoon, SK
St. John, NB
St. John’s, NF
Sudbury, ON
Thunder Bay, ON
Toronto, ON
Vancouver, BC
Winnipeg, MB

50
40
35
40
45
45
50
45
50
50
40
35
40
50
35
35
50

50
45
40
40
45
45
55
45
55
50
45
35
45
55
40
40
55

538
431
377
431
484
484
538
484
538
538
431
377
431
538
377
377
538

538
484
431
431
484
484
592
484
592
538
484
377
484
592
431
431
592

USA

Surface Snow
Melting – MI
Surface Snow
Melting – ElectroMelt

Fire Sprinkler System
Freeze Protection

2. Select the heating
cable

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting and Anti-Icing Design

Canada

Floor Heating

To provide faster heat-up, the required watt density in Table 2 is greater than what is
suggested by ASHRAE.

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Sheets

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Freezer Frost
Heave Prevention

Note:

Surface snow melting and anti-icing – electromelt
Example: Surface Snow Melting System
Geographical location Buffalo, NY (from Step 1)
Required watt density 40 W/ft2 (431 W/m2) (from Table 2)
ANTI-ICING

From the minimum ambient temperature and average wind speed that you
determined in Step 1 for your anti-icing application, use the tables below to
determine the required watt density for that application.
Table 3 Required Watt Density for Ice-Free Surfaces W/ft2
Minimum ambient
temperature
°F

Average wind speed during freezing periods
5 mph

10 mph

15 mph

20 mph

20°F

10°F

0°F

–10°F

–20°F

–

–30°F

–

–40°F

–

Table 4 Required Watt Density for Ice-Free Surfaces W/m2
Minimum ambient
temperature
°C

Average wind speed during freezing periods
8 kmph

16 kmph

24 kmph

32 kmph

–7°C

323

377

431

–12°C

323

377

484

–18°C

323

431

484

646

–23°C

323

484

646

861

–29°C

377

592

861

–

–34°C

431

699

–

–40°C

484

807

–

Note: This procedure is derived from finite model studies of 4-inch slabs and is
applicable to standard concrete pavement from 4 to 6 inches thick placed directly on
grade. If your application involves other materials or construction, contact your
Pentair Thermal Management representative.
Example: Anti-Icing System
Minimum ambient temperature 10°F (–12°C) (from Step 1)

178

Average wind speed

20 mph (32 kmph) (from Step 1)

Required watt density

45 W/ft2 (484 W/m2) (from Table 3 and Table 4)

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Surface Snow Melting
and Anti-Icing

Step 4 Determine heating cable spacing

1. Determine design
conditions

3. Determine the
required watt density
4. Determine heating
cable spacing
5. Determine the total
area to be protected
6. Determine heating
cable length

To determine your heating cable spacing, you need to know your applications’s power
output and required watt density.
The power output from the ElectroMelt heating cable depends on the cable type and
the supply voltage used in the application. Table 5 lists power output per linear foot
of heating cable determined by the supply voltage. Divide this figure by the required
watt density that you determined in Step 3. You will get the required heating cable
spacing in feet or meters as applicable. Multiply this figure by 12 inches or by 100
centimeters to determine your heating cable spacing.
Table 5 Heating Cable Spacing in Concrete
Supply voltage

Catalog number

Power output W/ft (W/m)

208 V

EM2-XR

30 (98)

9. Select the control
system and power
distribution

240 V

EM2-XR

32 (105)

277 V

EM2-XR

34 (112)

10. Complete the Bill
of Materials

347 V

EM3-XR

24 (79)

8. Select the connection
kits and accessories

Roof and Gutter
De-Icing

7. Determine the
electrical parameters

Surfaces

Surface Snow
Melting – MI

To determine cable spacing required for surface snow melting and anti-icing
Heating cable spacing (in) =

(W/ft power output of cable per Table 5) x 12 in
W/ft2 requirement from Step 3

Heating cable spacing (cm) =

Fire Sprinkler System
Freeze Protection

2. Select the heating
cable

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting and Anti-Icing Design

(W/m power output of cable per Table 5) x 100 cm
W/m2 requirement from Step 3
Surface Snow
Melting – ElectroMelt

Round answer to nearest whole number of inches or centimeters.
Example: Surface Snow Melting System
277 V (from Step 1)

Heating cable

EM2-XR (from Step 2)

Power output

34 W/ft (112 W/m2) (from Table 5)

Spacing

(34 W/ft x 12 in) /40 W/ft2 = 10.2 in
Rounded to 10 in

(112 W/m x 100 cm) / 431 W/m2 = 26 cm

Freezer Frost
Heave Prevention

Supply voltage

Example: Anti-Icing System
277 V (from Step 1)

Heating cable

EM2-XR (from Step 2)

Power output

34 W/ft (from Table 5)

Spacing

(34 W/ft x 12 in) / 45 W/ft2 = 9.1 in
Rounded to 9 in

(112 W/m x 100 cm) / 484 w/m2 = 23.1 cm
Rounded to 23 cm

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Sheets

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Floor Heating

THERMAL MANAGEMENT SOLUTIONS

Supply voltage

Surface snow melting and anti-icing – electromelt
Stairs

Heat loss in stairs occurs from the two exposed surfaces: the top of the stair and
its side. Watt density requirements are therefore greater for snow melting and antiicing. Rather than calculating heating cable spacing in the stair, refer to Table 6 and
determine the number of runs of heating cable per stair based on the depth of the
stair. Space the heating cable evenly across the depth of the stair with one run 2 in
(5 cm) from the front, or nose, of the stair. This method will provide sufficient watt
density for both snow melting and anti‑icing.
Table 6 Heating cable runs per stair
Stair depth

Number of cable runs per stair

Less than 10.5 in (27 cm)

10.5–12 in (27–30 cm)

For landings in the stairway, use cable spacing as calculated for surfaces. As with
stairs, a run of heating cable must be placed 2 in (5 cm) from the exposed edge of
the landing leading to the stairs.
Anticipate and design for the addition of railings or other follow on construction that
will require cutting or drilling into the concrete as damage to installed heating cable
may occur. Allow for at least 4 inches clearance between the heating cable and any
planned cuts or holes.
Example: Surface Snow Melting and Anti-Icing System
Depth of stair

12 in (30 cm) (from Step 1)

Number of cable runs per stair

3 runs

Spacing

Equally spaced across the width of the stair with
one run 2 in (5 cm) from the front edge

Junction
box

5 ft

ir
Sta th
p
de in
12 cm)
(30

Ri
heser
igh
t (156 in
cm

Wid
th
(1.5
m)

pth
de
ing
d
n
La 3 ft )
9m
(0.

)

Fig. 5 Typical heating cable layout for concrete stairs

180

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Surface Snow Melting
and Anti-Icing

Step 5 Determine the total area to be protected

1. Determine design
conditions

Surfaces

4. Determine heating
cable spacing

Example: Surface Snow Melting System

5. Determine the total
area to be protected

Total area of concrete slab

6. Determine heating
cable length

8. Select the connection
kits and accessories
9. Select the control
system and
power distribution
10. Complete the Bill
of Materials

Example: Anti-Icing System
Total area of concrete slab

80 ft x 50 ft = 4000 ft2
(24.4 m x 15.2 m = 370.8 rounded to = 371 m2)

Wheel Tracks

To reduce power consumption for concrete driveways, it may be sufficient to provide
snow melting for only the wheel tracks.

Cable in 6 in minimum
(15 cm) from edge
unless curbs used

6'6" (2

Surface Snow
Melting – MI

Design wheel track applications with the same spacing used for concrete slabs.
Heating cable should run to the edge of each side of the wheel track and be laid in a
serpentine pattern along the length of the wheel track.

Roof and Gutter
De-Icing

7. Determine the
electrical parameters

80 ft x 50 ft = 4000 ft2
(24.4 m x 15.2 m = 370.8 rounded to = 371 m2)

Fire Sprinkler System
Freeze Protection

3. Determine the
required watt density

To determine the total amount of heating cable, you need to determine the surface
area you will be protecting from snow and ice accumulation. If assistance is required
in designing for irregular shaped areas, please contact your Pentair Thermal
Management representative.

2. Select the heating
cable

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting and Anti-Icing Design

m) ty

Surface Snow
Melting – ElectroMelt

Structurally sound welldrained base designed to
handle expected load and
environmental conditions

Freezer Frost
Heave Prevention

Fig. 6 Wheel track example
Stairs

Surface area of the stairs is not required to determine heating cable required.

Floor Heating

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Step 6 Determine heating cable length
SURFACES

Calculate the heating cable length by dividing the total heated area by the heating
cable spacing calculated in the previous steps. In Step 8, you will need to add
additional heating cable for connection kits and end terminations which will then
give you the total heating cable length.
Calculate the heating cable length for the surface as follows:
Heating cable length =

5. Determine the total
area to be protected

Heating cable spacing (in)

6. Determine heating
cable length

Heated area (m2) x 100

7. Determine the
electrical parameters
8. Select the connection
kits and accessories
9. Select the control
system and power
distribution
10. Complete the Bill
of Materials

Heated area (ft2) x 12

Heating cable spacing (cm)
Example: Surface Snow Melting System for Concrete Slab
Total area of concrete slab

4000 ft2 (371 m2) (from Step 5)

Cable spacing

10 in (26 cm) (from Step 4)

(4000 ft2 x 12 in) / 10 in spacing = 4800 ft
(371 m2 x 100 cm) / 26 cm spacing = 1427 m

Heating cable length

4800 ft (1427 m)

Example: Anti-Icing System for Concrete Slab

182

Total area of concrete slab

4000 ft2 (371 m2) (from Step 5)

Cable spacing

9 in (23 cm) (from Step 4)

(4000 ft2 x 12 in) / 9 in spacing = 5333 ft
(371 m2 x 100 cm) / 23 cm spacing = 1613 m

Heating cable length

5333 ft (1613 m)

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Stairs

Fire Sprinkler System
Freeze Protection

Junction
box

5 ft

th
ep
r d in
i
a
St 12 m)
c
(30

Wid
th
(1.5
m)

eig

(156 in
cm

Roof and Gutter
De-Icing

pth
de
ing t
d
n 3f )
La
9m
(0.

)

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting and Anti-Icing Design

Surface Snow
Melting – MI

Fig. 7 Concrete stair example

Length of cable = No. of stairs x [(No. runs per stair x width of stair) + (2 x riser height)]
for stair (ft) (m)

Surface Snow
Melting – ElectroMelt

Use the formula below to determine the length of cable required for stairs. Stair area
is not needed for the cable length calculation. Two or three runs of heating cable will
be installed per stair as determined in Step 3. For landing areas, use the equation for
surfaces.

Example: Surface Snow Melting and Anti-Icing System for Stairs
10 stairs (from Step 1)

Number of cable runs per stair

3 runs

Width of stair

5 ft (1.5 m) (from Step 1)

Riser height

6 in (15 cm) convert to 0.5 ft (0.15 m) (from Step 1)

10 stairs x [(3 x 5 ft) + (2 x 0.5 ft)] = 160 ft
10 stairs x [(3 x 1.5 m) + (2 x 0.15 m)] = 48 m

Heating cable length

160 ft (48 m)

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Floor Heating

For applications where the landing area is very large or where an expansion joint
exists between the stairs and landing, consider the stairs and landing as two
separate areas. In these cases, determine the length of cable required for the stairs
as shown earlier in this section and select the cable for the landing as shown for
ramps, slabs, driveways, sidewalks, platform scales.

Freezer Frost
Heave Prevention

Number of stairs

Surface snow melting and anti-icing – electromelt
Surface Snow Melting
and Anti-Icing
1. Determine design
conditions
2. Select the heating
cable
3. Determine the
required watt density
4. Determine heating
cable spacing
5. Determine the total
area to be protected
6. Determine heating
cable length
7. Determine the
electrical parameters
8. Select the connection
kits and accessories
9. Select the control
system and
power distribution
10. Complete the Bill
of Materials

Step 7 Determine the electrical parameters
This section will help you determine the electrical parameters for an ElectroMelt
system including circuit breaker sizing and maximum circuit length. Total required
heating cable length divided by maximum circuit length will determine the number of
circuits required for your snow melting solution.
DETERMINE MAXIMUM CIRCUIT LENGTH

To determine maximum circuit length, it is important to establish a minimum startup
temperature for the system. The following tables provide maximum circuit lengths
based on minimum startup temperature, circuit breaker rating, and supply voltage.
Colder temperature startup requires shorter maximum circuit lengths. The use of an
automatic system, which energizes the system above 20°F (–7°C), ensures that you
can use maximum circuit lengths. Manual control systems may require you to use
shorter circuit lengths to compensate for startup below 20°F (–7°C).
A 30-mA ground-fault protection device (GFPD) must be used to provide protection
from arcing or fire, and to comply with warranty requirements, agency certifications,
and national electrical codes. If the heating cable is improperly installed, or
physically damaged, sustained arcing or fire could result. If arcing does occur, the
fault current may be too low to trip conventional circuit breakers.
Table 7 Maximum Circuit Length for Startup at 20°F (–7°C) in Feet
(Meters) using an Automatic Snow Control System
Heating cable supply voltage

Circuit Breaker
(A)

208 V

240 V

277 V

347 V

80 (24)

85 (26)

100 (31)

120

(37)

105

115 (35)

130

(40)

165

(50)
(76)

(32)

160

(49)

170

(52)

195

(59)

250

210

(64)

230

(70)

260

(79)

330 (101)

265

(81)

285

(87)

325

(99)

†

Table 8 Maximum Circuit Length for Startup at 0°F (–18°C) in Feet
(Meters) using a Manual Control System
Heating cable supply voltage

Circuit Breaker
(A)
15

208 V

(23)

240 V

(24)

277 V

(27)

347 V
107

(33)

100

(31)

110

(34)

120

(37)

148

(45)

145

(44)

160

(49)

180

(55)

225

(69)

288

(88)

200

(61)

210

(64)

240

(73)

245

(75)

265

(81)

300

(91)

†

† Not permitted

184

Startup temperature

20°F (–7°C) (from Step 1)

Circuit breakers

50 A

Supply voltage

277 V (from Step 1)

Maximum circuit length

325 ft (99 m) (from Table 7)

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Determine number of circuits

Use the following formula to determine number of circuits for the system:

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting and Anti-Icing Design

Number of circuits = Heating cable length required
Fire Sprinkler System
Freeze Protection

Maximum heating cable circuit length

Example: Surface Snow Melting
Surfaces
Total heating cable length

4800 ft (1427 m) (from Step 6)

Maximum circuit length

325 ft (99 m) (from above)

Number of circuits

4800 / 325 = 14.8 rounded to 15 circuits

Stairs
160 ft (48 m) (from Step 6)

Maximum circuit length

325 ft (99 m) (from above)

Number of circuits

160 / 325 = 0.5 rounded to 1 circuit

Roof and Gutter
De-Icing

Total heating cable length

Example: Anti-Icing System
Surfaces
5333 ft (1613 m) (from Step 6)

Maximum circuit length

325 ft (99 m)

Number of circuits

5333 / 325 = 16.4 rounded to 17 circuits

Surface Snow
Melting – MI

Total heating cable length

Stairs
Total heating cable length

160 ft (48m) (from Step 6)

Maximum circuit length

325 ft (99 m) (from above)

Number of circuits

160 / 325 = 0.5 rounded to 1 circuit

Determine Transformer load
Surface Snow
Melting – ElectroMelt

The total transformer load is the sum of load on all the circuit breakers in the
system.
Calculate the Circuit Breaker Load (CBL) as:
CBL (kW) =

Circuit breaker rating (A) x 0.8 x Supply voltage
1000

If the CBL is equal on all circuit breakers, calculate the Total Transformer Load as:
Total Transformer Load (kW) = CBL x Number of circuits
If the CBL is not equal on all circuit breakers, calculate the Total Transformer Load as:

Freezer Frost
Heave Prevention

Calculate the Total Transformer Load as follows:

Total Transformer Load (kW) = CBL1 + CBL2 + CBL3...+ CBLN
Floor Heating

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Sheets

THERMAL MANAGEMENT SOLUTIONS

Surface snow melting and anti-icing – electromelt
Example: Surface Snow Melting
Circuit breaker load

(50 A x 0.8 x 277 V) / 1000 = 11.1 kW

Transformer Load

11.1 kW x 16 circuits = 177.6 kW rounded to 178 kW

178 kW

Example: Anti-Icing System

Surface Snow Melting
and Anti-Icing
1. Determine design
conditions
2. Select the heating
cable
3. Determine the
required watt density
4. Determine heating
cable spacing
5. Determine the total
area to be protected
6. Determine heating
cable length
7. Determine the
electrical parameters
8. Select the connection
kits and accessories
9. Select the control
system and
power distribution

Circuit breaker load

(50 A x 0.8 x 277 V) / 1000 = 11.1 kW

Transformer load

11.1 kW x 18 circuits = 199.8 kW rounded to 200 kW

200 kW

Step 8 Select the connection kits and accessories
Pentair Thermal Management provides all the connection kits and accessories
necessary to satisfy code, approval agency, and warranty requirements for the
ElectroMelt system. Additional heating cable will be required for connection kits
and end terminations. Adding the additional heating cable allowances needed with
the heating cable length required for the layout will give you the total heating cable
length required.
Prepare a drawing of your system showing distinct circuits, layout of cables,
connection kits, expansion joints, drains, heated pathways for meltwater, power
connections, junction boxes, and sensors. Determine length of cable from slab for
power connection for all circuits. If possible, avoid crossing expansion, crack control,
or other pavement joints. Use the EMK‑XEJ expansion joint kit to protect the heating
cable if crossing is unavoidable.
Junction boxes must be mounted above grade to prevent water entry. Use an EMKXJB or equivalent UL Listed or CSA Certified weatherproof junction box. Protect
heating cable from slab to junction box inside individual 1-inch rigid metal conduits.
Do not penetrate floors or walls with conduit, nor insulate the conduit.

10. Complete the Bill
of Materials

186

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Table 9 Connection Kits and Accessories
Catalog
number

Description

Standard
packaging Usage

Heating cable
allowance 1

EMK-XP

Power connection and
end seal kit

1 per circuit

3 ft (1 m) for connection
plus conduit length for
power connection and
conduit length for end
seal

EMK-XS

Splice kit

As required

1 ft (30 cm)

EMK-XJR

Jacket repair kit

EMK-CT

Nylon cable ties

100/pack

EMK-XT

Crimping tool

SMCS

Snow melt caution sign
1
Dimensions: 6 x 4 in (150 x 100 mm)

1 minimum
per system

EMK-XEJ

Expansion joint kit

1 per expansion
joint crossing

EMK-XJB

1
Junction box
Dimensions: 15 1/2 x 11 3/4 x 7 5/8 in
(394 x 299 x 194 mm)

Power connection EMK-XP

End seal EMK-XP

Fire Sprinkler System
Freeze Protection

Connection Kits

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting and Anti-Icing Design

Roof and Gutter
De-Icing

Accessories

1 per foot of cable
used

–

Surface Snow
Melting – MI

–

–
Surface Snow
Melting – ElectroMelt

As required

–

1 1/2 ft (45 cm)
Freezer Frost
Heave Prevention

1–2 ft (30–60 cm) for
each end in the junction
box
Maximum of two
circuits per EMK-XJB

Floor Heating

FH-2616A-1 Propane torch is suitable for heat
shrinking the connection kits;
includes a hose, a handle assembly,
and comes equipped with a regulating valve.
Shipping weight: 5 lbs (2.27 kg)

THERMAL MANAGEMENT SOLUTIONS

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Technical Data
Sheets

1 Allow extra heating cable for ease of component installation.

Surface snow melting and anti-icing – electromelt
Example: Surface Snow Melting System
Number of circuits

15 for concrete slab + 1 for stairs = 16

Power connection kits

16 power connection kits

Conduit length (from slab to junction box)
Power connection
15 ft (4.5 m)
End seal
15 ft (4.5 m)

(15 ft + 15 ft) x 16 circuits = 480 ft
(4.5 m + 4.5 m) x 16 circuits = 144 m

Heating cable allowance for each power connection

3 ft x 16 circuits = 48 ft

1 m x 16 circuits = 16 m
Total heating cable length required

528 ft (160 m)

Example: Anti-Icing System
Number of circuits

17 for concrete slab + 1 for stairs = 18

Power connection kits

18 power connection kits

Conduit length (from slab to junction box)
Power connection
15 ft (4.5 m)
End seal
15 ft (4.5 m)

(15 ft + 15 ft) x 18 circuits = 540 ft
(4.5 m + 4.5 m) x 18 circuits = 162 m

Heating cable allowance for each power connection

3 ft x 18 circuits = 54 ft

188

1 m x 18 circuits = 18 m

Total heating cable length required

594 ft (180 m)

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THERMAL MANAGEMENT SOLUTIONS

Surface Snow Melting
and Anti-Icing

Step 9 Select the control system and power distribution

1. Determine design
conditions

3. Determine the
required watt density
4. Determine heating
cable spacing
5. Determine the total
area to be protected
6. Determine heating
cable length

8. Select the connection
kits and accessories
9. Select the control
system and
power distribution
10. Complete the Bill
of Materials

Select a control system from the following three options, but keep in mind that
an automatic snow controller offers the highest system efficiency and the lowest
operating cost.
• Manual on/off control
• Slab sensing thermostat
• Automatic snow melting controller
If the current rating of the control means is exceeded, all three methods will require
contactors sized to carry the load. Each method offers a tradeoff balancing initial
cost versus energy efficiency and ability to provide effective snow melting. If the
system is not energized when required, snow will accumulate. If the system is
energized when it is not needed, there will be unnecessary power consumption.
Choose the control method that best meets the project performance requirements.
For additional information, refer to the “Typical Control Diagrams,” Table 7, or contact
your Pentair Thermal Management representative for details.

Roof and Gutter
De-Icing

7. Determine the
electrical parameters

Control Systems
Fire Sprinkler System
Freeze Protection

2. Select the heating
cable

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting and Anti-Icing Design

Manual On/Off Control

Slab Sensing Thermostat

Automatic Snow Melting Controller

For areas where a large number of circuits are required, the DigiTrace ACS-30 can
be used. The Surface Snow Melting control mode in the ACS-30 includes an External
Device control option. This option allows a Snow/Moisture sensing controller (from
Table 10) to be integrated into the ACS-30 system. Note that sensors (snow or
gutter) cannot be directly connected to the ACS-30 system. Refer to the ACS-30
Programming Guide (H58692) for more information on system setup.

Freezer Frost
Heave Prevention

With an automatic snow controller, the snow melting system is automatically
energized when both precipitation and low temperature are detected. When
precipitation stops or the ambient temperature rises above freezing, the system
is de-energized. In addition, a slab sensor de-energizes the system after the slab
reaches the slab sensing set point even if freezing precipitation is still present. Using
an automatic snow controller with a slab sensor offers the most energy-efficient
control solution.

Surface Snow
Melting – ElectroMelt

A slab sensing thermostat can be used to energize the system whenever the slab
temperature is below freezing, but is not energy efficient when used as the sole
means of control. The slab sensing thermostat is recommended for all snow melting
applications, even when an automatic snow controller is used, and is required for
all asphalt and paver installations (for asphalt, it prevents surface damage due to
overheating).

Surface Snow
Melting – MI

Floor Heating

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Sheets

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Surface snow melting and anti-icing – electromelt
Optional
RCU-3 or RCU-4
remote control unit

CIT-1
snow sensor

To additional
SC-40C satellite
contactors

Optional
SC-40C
satellite
contactor

SIT-6E pavement
mounted sensor

To power supply
To heating cable(s)
APS-4C (shown) with SC-40C satelllite
contactor or APS-3C snow controller

Environmental Technology, Inc, (ETI) of
South Bend, Indiana offers a complete
line of automatic controllers for snow
melting applications.

To power supply or incorporate the ETI snow
melting control system into a power
distribution panel
To heating cable(s)

Fig. 8 Automatic snow melting control system

Table 10 Control Systems
Catalog number

Description

Slab Sensing Thermostat
ECW-GF

Electronic ambient sensing controller with 30-mA ground-fault protection. The controller can be programmed to maintain temperatures up to 200°F (93°C) at voltages from
100 to 277 V and can switch current up to 30 Amperes. The ECW-GF is complete with
a 25-ft (7.6-m) temperature sensor and is housed in a Type 4X rated enclosure. The
controller features an AC/DC dry alarm contact relay.
An optional ground-fault display panel (ECW-GF-DP) that can be added to provide
ground-fault or alarm indication in applications where the controller is mounted in
inaccessible locations.

ECW-GF-DP

An optional remote display panel (ECW-GF-DP) can be added to provide ground-fault
or alarm indication in applications where the controller is mounted in inaccessible
locations.

ETI PD Pro

ETI GF Pro

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Table 10 Control Systems
Catalog number

Description

Automatic Snow Melting Controllers
Automatic snow melting controller housed in a Type 3R enclosure provides effective,
economical automatic control of all snow melting applications. Features include:
120 V or 208–240 V models, 24-A DPDT output relay and an adjustable hold-on timer.
Enclosure dimensions: 11-1/2 in x 9-1/8 in x 6-9/16 in (292 mm x 232 mm x 167 mm)

APS-4C

Enclosure dimensions: 11-1/2 in x 9-1/8 in x 6-9/16 in (292 mm x 232 mm x 167 mm)
SC-40C

Enclosure dimensions: 11-1/2 in x 9-1/8 in x 6 in (292 mm x 232 mm x 152 mm)

Surface Snow
Melting – MI

Satellite contactor power control peripheral for an APS-4C snow melting controller, housed in a Type 3R enclosure. Features include: 277 V single-phase or 208–240,
277/480 and 600 V three-phase models, built-in 3-pole contactor and integral 30 mA
ground-fault circuit interrupter.

Roof and Gutter
De-Icing

Automatic snow melting controller housed in a Type 3R enclosure provides effective,
economical automatic control of all snow melting applications. The APS-4C can operate with any number of SC-40C satellite contactors for larger loads. Features include:
277 V single-phase or 208–240, 277/480, and 600 V three-phase models, built-in
3-pole contactor, integral 30 mA ground-fault circuit interrupter and an adjustable
hold-on timer.

Fire Sprinkler System
Freeze Protection

APS-3C

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting and Anti-Icing Design

Snow Melting and Gutter De-Icing Sensors and Accessories

SIT-6E

RCU-3

The RCU–3 provides control and status display to the APS–3C controller from a
remote location. It has a 2, 4, 6 or 8 hour CYCLE TIME adjustment, independent of
APS-3C setting.

RCU-4

Freezer Frost
Heave Prevention

Overhead snow sensor that detects precipitation or blowing snow at ambient temperatures below 38°F (3.3°C). For use with either an APS-3C or APS-4C automatic snow
melting controller.

Surface Snow
Melting – ElectroMelt

CIT-1

Floor Heating

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Surface snow melting and anti-icing – electromelt
Table 10 Control Systems
Catalog number

Description

Electronic Controllers

A0
A1
A2
A3
A4
A5
A6
A7

ACS-UIT2
ACS-PCM2-5

The DigiTrace ACS-30 Advanced Commercial Control System is a multipoint
electronic control and monitoring system for heat-tracing used in various commercial
applications such as pipe freeze protection, roof and gutter de-icing, surface snow
melting, hot water temperature maintenance and floor heating. The DigiTrace ACS-30
system can control up to 260 circuits with multiple networked ACS-PCM2-5 panels,
with a single ACS-UIT2 user interface terminal. The ACS-PCM2-5 panel can directly
control up to 5 individual heat-tracing circuits using electromechanical relays rated at
30 A up to 277 V.

ProtoNode-LER
ProtoNode-RER

The DigiTrace ProtoNode is an external, high performance multi-protocol gateway for
customers needing protocol translation between Building Management Systems (BMS)
and the DigiTrace ACS-30 or C910-485 controllers.

PROTOCESSOR
SERIAL ETHERNET

PROTONODE

B0
B1
B2
B3
S0
S1
S2
S3

By FieldServer Technologies
www.ProtoCessor.com

RS 485 GND
RS 485 RS 485+

The ProtoNode-LER is for LonWorks® systems; and the ProtoNode-RER is for
BACnet® or Metasys® N2 systems.

+PWR
- PWR
FRAME GND

RTD10CS
RTD-200
RTD50CS

Power Distribution

Single Circuit Control
Heating cable circuits that do not exceed the current rating of the selected
temperature control can be switched directly (see Fig. 9).
Group Control
If the current draw exceeds the switch rating, or if the controller will activate more
than one circuit, or group control, an external contactor must be used (see Fig. 9).
Large systems with many circuits should use an SMPG power distribution panel.
The SMPG is a dedicated power-distribution, control, ground-fault protection,
monitoring, and alarm panel for surface snow melting and anti-icing applications.
This enclosure contains an assembled circuit-breaker panelboard. Panels are
equipped with ground-fault circuit breakers with or without alarm contacts. The
group control package allows the system to operate automatically in conjunction
with an ambient-sensing thermostat, individual electronic, or duty cycle controller.

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Single circuit control

Group control
Temperature
controller
1 ø supply
N

Temperature
controller

1-pole
GFEP breaker

ø supply
N

ø
ø
ø

Heating cable
sheath, braid
or ground

3-phase 4-wire
supply (WYE)

Fire Sprinkler System
Freeze Protection

Heating
cable

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting and Anti-Icing Design

Roof and Gutter
De-Icing

Contactor

3-pole main
breaker
N
G (Typ 3)

Heating cable
sheath, braid
or ground

Fig. 9 Single circuit and group control
Surface Snow
Melting – MI

Mounting brackets
Nameplate

Snow/Ice
melt controller

Heater thermostat
(3R only)
Power on light
HTC energized light

EUR - 5A

Ground bar
Main breaker
(optional)

Panel
board

Branch
breakers
(2 pole)

C.B. tripped alarm
Heater cycle
atimed control

Surface Snow
Melting – ElectroMelt

Door lock handle

Heat trace
contactor

Control wiring
NP

Panelboard
lugs

Heater (3R only)
NP

Exterior View

Interior View

Main circuit breaker (optional)
N
Incoming
power
Remote annunciation alarm
(circuit breaker
with alarm type #3)

Slab
temperature sensor

Control transformer
GIT-1

EUR-5A SNOW SWITCH

24 V

AUTOMATIC SNOW/ICE MELTING CONTROL PANEL

SUPPLY
SNOW/ICE

HOURS
60°F
55°F

HEATER

Aerial
CIT-1 snow sensor

HEATER
CYCLE

50°F
45°F

65°F

Gutter
ice sensor

70°F
75°F
80°F
85°F

TEMPERATURE

SIT-6E

One-pole with 30-mA
ground-fault trip (277 V)

Pavement-mounted
sensor

Floor Heating

Three-pole main contactor

Fuse

Freezer Frost
Heave Prevention

Fig. 10 SMPG1 power distribution panel

Single Ø
connection

GND
Braid

Fig. 11 Typical wiring diagram of group control with SMPG1

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Surface snow melting and anti-icing – electromelt
Table 11 Power Distribution
Catalog number

Description

Power Distribution and Control Panels
SMPG1

Single-phase power distribution panel that includes ground-fault protection, monitoring, and control for snow melting systems. Single-phase voltages include 208 and 277 V.
If standard configurations do not meet your needs, custom SMPG panels are available
and processed under the catalog number SMPG-GENERAL, part number P000000763.
Please contact your Pentair Thermal Management representative for a custom SMPG
panel quotation.

NP
NP

Contactors
E104

E304

Example: Surface Snow Melting System
This system has 16 circuits and will require a specially designed control panel.
As many as eight SIT-6E sensors can be used in this configuration. The amount
depends upon designer preference.
Example: Anti-Icing System
This system has 18 circuits and will require a specially designed control panel.
As many as eight SIT-6E sensors can be used in this configuration. The amount
depends upon designer preference.

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Surface Snow Melting
& Anti-Icing

Step 10 Complete the Bill of Materials

1. Determine design
conditions

Fire Sprinkler System
Freeze Protection

2. Select the heating
cable

If you used the Design Worksheet to document all your design parameters, you
should have all the details you need to complete the Bill of Materials.

Pipe Freeze Protection
and Flow Maintenance

Surface Snow Melting and Anti-Icing Design

3. Determine the
required watt density
4. Determine heating
cable spacing
5. Determine the total
area to be protected
6. Determine heating
cable length

Roof and Gutter
De-Icing

7. Determine the
electrical parameters
8. Select the connection
kits and accessories
9. Select the control
system and
power distribution
10. Complete the Bill
of Materials

Surface Snow
Melting – MI
Surface Snow
Melting – ElectroMelt
Freezer Frost
Heave Prevention
Floor Heating

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Surface snow melting and anti-icing – electromelt
ElectroMelt System Surface Snow Melting and Anti-Icing Design Worksheet
Step  Determine design conditions
Size and layout

Supply
voltage

Phase

Control method

❑ Surface snow melting
Geographical location:
_____________________

Slab surface (ft/m) ___________________

❑ 208 V

❑ Single-phase

❑ Manual on/off control

Ramp surface (ft/m)__________________

❑ 240 V

❑ Slab-sensing thermostat

❑ Anti-icing
Minimum ambient temperature:
_____________________
Average wind speed during
freezing periods (mph/kmph):
____________________

Stairs

❑ 277 V

❑ Automatic snow melting
controller

Application

Number of stairs

_______________

Width of stair (ft/m) _______________

Riser height (in/cm) _______________

Paving material

Depth of stair (in/cm)_______________
Landing dimensions
(ft/m)
_______________

❑ Concrete pavement

Wheel tracks

❑ 347 V

Track length (ft/m) _____________

❑ In concrete under paving stones

Example:
9 Surface snow melting

Slab surface:

9 Buffalo, NY

Stairs

9 Concrete slab

Number of stairs 10

Width of stair

5 ft

Riser height

6 in

Depth of stair

12 in

80 ft x 50 ft

9 277 V

9 Single-phase 9 Automatic snow melting
controller

Step  Select the heating cable
See Table 1
❑ EM2-XR

❑ EM3-XR

Example:
9 EM2-XR

Step  Determine the required watt density
Surface snow melting

Anti-icing

See Table 2

See Table 3 and Table 4

Geographical location:

_________________________ Minimum ambient temperature (°F/°C):

_______

Required watt density (W/ft2)(W/m2): ___________________________ Average wind speed during freezing periods (mph/kmph): ______

Required watt density (W/ft2)(W/m2):

_______

Example:
Geographical location: Buffalo, NY
Required watt density: 40 W/ft2

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Step  Determine heating cable spacing
See Table 5

Pipe Freeze Protection
and Flow Maintenance

ElectroMelt System Surface Snow Melting and Anti-Icing Design Worksheet

Surfaces
Power output (W/ft)

x 12 in/ft ) /

Watt density (W/ft2)

Heating cable spacing (in)

Note: Round result to the nearest whole number of inches or centimeters.
Stairs
Calculate the heating cable needed for stairs and landing
Determine the number of cable runs needed:

Fire Sprinkler System
Freeze Protection

(

Depth of stair: <10.5 in (27 cm): 2 cable runs

Roof and Gutter
De-Icing

Depth of stair: 10.5–12 in (27–30 cm): 3 cable runs
Cable runs needed:
Concrete stair depth (in/cm):

Number of cable runs:

Spacing:

Example:
Surfaces
34 W/ft
Power output (W/ft)

40 W/ft2

x 12 in/ft ) /

Watt density (W/ft )
2

10 in
Heating cable spacing (in/cm)

Note: Round result to the nearest whole number of inches or centimeters.

Stairs
Calculate the heating cable needed for stairs and landing

Surface Snow
Melting – MI

(

Determine the number of cable runs needed:
Depth of stair: <10.5 in (27 cm): 2 cable runs
Depth of stair: 10.5–12 in (27–30 cm): 3 cable runs
3
Cable runs needed:
12 in

Number of cable runs:

Spacing:

Equally spaced across the width of the stair
with one run 2 in from the front edge

Step  Determine the total area to be protected
Surfaces
Length (ft/m)

Width (ft/m)

Surface area to be protected (ft2/m2)
Freezer Frost
Heave Prevention

Example:
80 ft
Length

50 ft

Width

Surface Snow
Melting – ElectroMelt

Concrete stair depth (in/cm):

4000 ft2
Surface area to be protected (ft)

Floor Heating

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Surface snow melting and anti-icing – electromelt
Step  Determine the heating cable length
Surfaces
Total concrete slab area (ft2/m2)

x 12 in /

Heating cable spacing (in/cm)

Heating cable length for surface (ft/m)

Calculate the heating cable for stairs and landing
No. of stairs

[(

No. of runs per stair

) + ( 2 x
)]=
Width of stair (ft/m)
Riser height (ft/m)

Heating cable length for stairs (ft/m)

Note: Additional heating cable for connection kits and end terminations is calculated in Step 8.
Calculate heating cable needed for wheel tracks
x 2 x 4 runs

Length (ft/m)

Wheel track to be protected (ft/m)

Total heating cable length required (ft/m)
Example:
Surfaces
4000 ft2
Total concrete slab area

12 in

10 in
Heating cable spacing

4800
Heating cable length for surface

Calculate the heating cable for stairs and landing
10
No. of stairs

[(

3
No. of runs per stair

5 ft
Width of stair

) + ( 2 x

0.5 ft
Riser height

)] =

160 ft
Heating cable length for stairs

Note: Additional heating cable for connection kits and end terminations is calculated in Step 8.
4960 ft
Total heating cable length required

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Step  Determine the electrical parameters
See Table 7 and Table 8

Pipe Freeze Protection
and Flow Maintenance

ElectroMelt System Surface Snow Melting and Anti-Icing Design Worksheet

Determine number of circults
/

Maximum heating cable circuit length (ft/m)

Fire Sprinkler System
Freeze Protection

Heating cable length required for surface (ft/m)

Number of circuits

Determine total transformer load
Calculate circuit breaker load (CBL)

(

Circuit breaker rating (Amps )

x 0.8 x

Supply voltage

)

/ 1000

Circuit breaker load (kW)
Roof and Gutter
De-Icing

Calculate the total transformer load as follows:
If the CBL is equal on all circuits, calculate the transformer load as:

Circuit breaker load (kW)

Number of breakers

Total transformer load (kW)

CBL1 + CBL2 + CBL3... + CBLN

Total transformer load (kW)

Surface Snow
Melting – MI

If the CBL is NOT equal on all circuits, calculate the transformer load as:

Example:
Determine number of circults: Surfaces
4800 ft

325 ft

Maximum heating cable circuit length

14.8 rounded to 15
Number of circuits

Surface Snow
Melting – ElectroMelt

Heating cable length required for surface

Determine number of circults: Stair
160 ft
Heating cable length required for surface

325 ft

Maximum heating cable circuit length

0.5 rounded to 1
Number of circuits

(

50 A
Circuit breaker rating
11.1 kW

Circuit breaker load (kW)

x 0.8

277 V
Supply voltage

)

/ 1000

Number of breakers

11.1 kW
Circuit breaker load (kW)
177.6 kW rounded to 178
Total transformer load (kW)

Freezer Frost
Heave Prevention

Determine transformer load

Floor Heating

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Surface snow melting and anti-icing – electromelt
Step  Select the connection kit and accessories
See Table 9

Connection kits

Description

Heating cable
allowance

Quantity

T EMK-XP

Power connection and end seal kit

____________

__________________

T EMK-XS

Splice kit

____________

__________________

Accessories

Description

Quantity

T EMK-XJR

Jacket repair kit

____________

T EMK-CT

Nylon cable ties

____________

T EMK-XT

Crimping tool

____________

T SMCS

Snow melt caution sign

____________

T EMK-XEJ

Expansion joint kit

____________

__________________

T EMK-XJB

Junction box

____________

__________________

T FH-2616A-1

Propane torch

____________

Total heating cable
allowance for connection kits
+
=
Total+heating cable length + Total heating cable allowance
Total heating cable
= for connection kits
=
Number circuits for concrete slab Circuit(s) for stairs Circuit(s) for expansion joints Total no. of circuits Total no. of power
connection
kits
length
required

(

Power connection conduit length
(slab to junction box) (ft/m)

Cable allowance per
circuit connection (ft/m)

Total conduit length (ft/m)

Total heating cable length (ft/m)

)

End seal conduit length
(slab to junction box) (ft/m)

Total number of circuits

Total allowance per
power connection kit (ft/m)
+

Total heating cable allowance (ft/m)

Total conduit length (ft/m)

Total heating cable allowance
per power connection (ft/m)

Total additional
heating cable (ft/m)

Total heating cable with
connection kit allowance (ft/m)

Example:
15

1
16
16
+
=
+
=
Number circuits for concrete slab Circuit(s) for stairs Circuit(s) for expansion joints Total no. of circuits Total no. of power connection kits

(

15 ft
Power connection conduit length
(slab to junction box)
3 ft
Cable allowance per
circuit connection
480 ft
Total conduit length

630 ft
Total heating cable length

200

15 ft

)

End seal conduit length
(slab to junction box)

Total number of circuits

Total number of circuits
48 ft

Total allowance per
power connection kit
63

Total heating cable allowance

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480 ft
Total conduit length
48 ft
Total heating cable allowance
per power connection
528 ft
Total additional heating cable

693 ft
Total heating cable with
connection kit allowance

THERMAL MANAGEMENT SOLUTIONS

Step  Select the control system and power distribution
Control Systems
See Table 10.

T ECW-GF

Electronic thermostat with 25-ft sensor

____________

T ECW-GF-DP

Remote display panel for ECW-GF

____________

T ETI PD Pro

Automatic snow and ice melting controller

____________

T ETI GF-Pro

Automatic snow and ice melting controller

____________

T APS-3C

Automatic snow and ice melting controller

____________

T APS-4C

Automatic snow and ice melting controller

____________

T SC-40C

Satellite contactor

____________

T CIT-1

Overhead snow sensor

____________

T SIT-6E

Pavement-mounted sensor

____________

T RCU-3

Remote control unit for APS-3C

____________

T RCU-4

Remote control unit for APS-4C

____________

T ACS-UIT2

ACS-30 user interface terminal

____________

T ACS-PCM2-5

ACS-30 power control panel

____________

T ProtoNode-LER

Multi-protocol gateway

____________

T ProtoNode-RER

Multi-protocol gateway

____________

T RTD3CS

Resistance temperature device for DigiTrace ACS-30

____________

T RTD10CS

Resistance temperature device for DigiTrace ACS-30

____________

T RTD-200

Resistance temperature device for DigiTrace ACS-30

____________

T RTD50CS

Resistance temperature device for DigiTrace ACS-30

____________

Power distribution and
control panels

Description

Quantity

T SMPG1

Single-phase power distribution panel

____________

Contactors and junction boxes

Description

Quantity

T E104

Three-pole, 100 A per pole contactor

____________

T E304

Three-pole, 40 A per pole contactor

____________

Surface Snow
Melting – MI

Quantity

Roof and Gutter
De-Icing

Description

Fire Sprinkler System
Freeze Protection

Thermostats, controllers
and accessories

Pipe Freeze Protection
and Flow Maintenance

ElectroMelt System Surface Snow Melting and Anti-Icing Design Worksheet

Power Distribution
See Table 11.
Surface Snow
Melting – ElectroMelt
Freezer Frost
Heave Prevention

Step  Complete the Bill of Materials
Use the information recorded in this worksheet to complete the Bill of Materials.

Floor Heating

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Sheets

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Surface snow melting and anti-icing – electromelt

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Pipe Freeze Protection
and Flow Maintenance

RaySol and MI Heating Cable System

Technical Data
Sheets

203

Floor Heating

11/13

Freezer Frost
Heave Prevention

EN-FreezerFrostHeavePrevention-DG-H58139

Surface Snow
Melting – ElectroMelt

THERMAL MANAGEMENT SOLUTIONS

Surface Snow
Melting – MI

Contents
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
How to Use this Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
Safety Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
System Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
Typical System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
Self-Regulating Heating Cable Construction. . . . . . . . . . . . . . . . . . . . . . . . . . 208
MI Heating Cable Construction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
Approvals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
Freezer Frost Heave Prevention Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
Design Assumptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
Design Step by Step RaySol and MI Heating Cables in Conduit . . . . . . . . . . . 211
Step 1 Determine the freezer configuration . . . . . . . . . . . . . . . . . . . . . . . . 212
Step 2 Select the heating cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
Step 3 Determine the heating cable conduit spacing and freezer load. . . 216
Step 4 Determine the heating cable layout and length. . . . . . . . . . . . . . . . 217
Step 5 Determine the electrical parameters. . . . . . . . . . . . . . . . . . . . . . . . 224
Step 6 Select the connection kits and accessories . . . . . . . . . . . . . . . . . . 226
Step 7 Select the control system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227
Step 8 Select the power distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229
Step 9 Complete the Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231
Design Step by Step MI Heating Cables Directly Embedded. . . . . . . . . . . . . . 232
Step 1 Determine the freezer configuration . . . . . . . . . . . . . . . . . . . . . . . . 233
Step 2 Determine heat loss and freezer load . . . . . . . . . . . . . . . . . . . . . . . 234
Step 3 Select the heating cable, layout and length. . . . . . . . . . . . . . . . . . . 236
Step 4 Determine the heating cable spacing. . . . . . . . . . . . . . . . . . . . . . . . 243
Step 5 Determine the electrical parameters. . . . . . . . . . . . . . . . . . . . . . . . 243
Step 6 Select the accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245
Step 7 Select the control system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246
Step 8 Select the power distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247
Step 9 Complete the Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250
RaySol and MI Heating Cable in Conduit Freezer Frost Heave Prevention
Design Worksheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251
MI Cables Directly Embedded Freezer Frost Heave Prevention
Design Worksheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 256

Roof and Gutter
De-Icing

This step-by-step design guide provides the tools necessary to design a Raychem
RaySol self-regulating heating cable system or a Pyrotenax Mineral Insulated
heating cable system for freezer frost heave prevention. For other applications or
for design assistance, contact your Pentair Thermal Management representative or
phone Pentair Thermal Management at (800) 545‑6258. Also, visit our web site at
www.pentairthermal.com.

Fire Sprinkler System
Freeze Protection

Freezer Frost Heave Prevention –

Freezer Frost Heave Prevention – RaySol and MI Heating Cable System
Introduction
Pentair Thermal Management offers two different heating cable technologies for
freezer frost heave prevention: Raychem RaySol self-regulating heating cable system
and Pyrotenax MI heating cable system. Both RaySol and MI heating cables can be
installed in conduit. Only MI heating cables can be embedded directly in the subfloor
(concrete, sand, or compacted fill).
If your application conditions are different, or if you have any questions, contact
your Pentair Thermal Management representative or contact Pentair Thermal
Management directly at (800) 545‑6258.
How to Use this Guide
This design guide presents Pentair Thermal Management’ recommendations
for designing freezer frost heave prevention systems. It provides design and
performance data, electrical sizing information, and heating cable layout
suggestions. Following these recommendations will result in a reliable, energyefficient system.
Follow the design steps in the respective “Design” sections and use the appropriate
“RaySol and MI Heating Cable in Conduit Freezer Frost Heave Prevention Design
Worksheet” on page 251 and “MI Cables Directly Embedded Freezer Frost Heave
Prevention Design Worksheet” on page 256 to document the project parameters that
you will need for your project’s Bill of Materials.
Other Required Documents

This guide is not intended to provide comprehensive installation instructions. For
complete freezer frost heave prevention system installation instructions, please refer
to the following additional required documents:
• Raychem RaySol Floor Heating and Frost Heave Prevention Installation and Operation Manual (H58138)
• Pyrotenax Mineral Insulated Heating Cable Floor Heating and Frost Heave Prevention Installation and Operation Manual (H58137)
• Additional installation instructions are included with the connection kits, thermostats, controllers, and accessories
If you do not have these documents, you can obtain them from the Pentair Thermal
Management web site at www.pentairthermal.com.
For products and applications not covered by this design guide, please contact your
Pentair Thermal Management representative or call Pentair Thermal Management
directly at (800) 545-6258.
Safety Guidelines
As with any electrical equipment, the safety and reliability of any system depends
on the quality of the products selected and the manner in which they are installed
and maintained. Incorrect design, handling, installation, or maintenance of any of
the system components could damage the system and may result in inadequate
performance, overheating, electric shock, or fire. To minimize these risks and to
ensure that the system performs reliably, read and carefully follow the information,
warnings, and instructions in this guide.
This symbol identifies important instructions or information.
This symbol identifies particularly important safety warnings that must be
followed.

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Warranty
Pentair Thermal Management’s standard limited warranty applies to Raychem and
Pyrotenax Freezer Frost Heave Prevention Systems.

System Overview

Pentair Thermal Management offers two different heating cable technologies for
freezer frost heave prevention: Raychem RaySol self-regulating heating cable and
Pyrotenax MI heating cable system. Both RaySol and MI heating cables can be
installed in conduit. Only MI heating cables can be embedded directly in the subfloor
(sand, compacted fill or concrete). The electrical conduit carrying the heating cable
or the directly embedded heating cable is installed in the subfloor under the freezerfloor insulation, as illustrated below. The subfloor layer may be a reinforced concrete
slab, a concrete mud slab, a bed of compacted sand, or simply compacted fill.

Surface Snow
Melting – ElectroMelt

RaySol or MI heating
cable in conduit

Surface Snow
Melting – MI

Subfreezing temperatures inside cold rooms, freezers, and ice arenas cause heat
to be lost from the soil under the floor, even when it is well insulated. As the soil
freezes, capillary action draws water into the frozen areas where the water forms
a concentrated ice mass. As the ice mass grows, it heaves the freezer floor and
columns, causing damage.

Roof and Gutter
De-Icing

An extension of the limited warranty period to ten (10) years from the date of
installation is available, except for the control and distribution systems, if a properly
completed online warranty form is submitted within thirty (30) days from the date of
installation. You can access the complete warranty on our web site at
www.pentairthermal.com.

Fire Sprinkler System
Freeze Protection

WARNING: To minimize the danger of fire from sustained electrical arcing
if the heating cable is damaged or improperly installed, and to comply with the
requirements of Pentair Thermal Management, agency certifications, and national
electrical codes, ground-fault equipment protection must be used on each heating
cable branch circuit. Arcing may not be stopped by conventional circuit protection.

Pipe Freeze Protection
and Flow Maintenance

System Overview

MI heating cable
directly embedded

Concrete

Freezer Frost
Heave Prevention

Insulation

Conduit
Subfloor
Heating cable

Soil

Floor Heating

Fig. 1 Typical freezer frost heave installation

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Freezer Frost Heave Prevention – RaySol and MI Heating Cable System
The RaySol self-regulating heating cable provides a cut-to-length solution. The
backbone of the system is the self-regulating heating cable available for 120 and
208–277 V applications. As Fig. 4 on page 208 indicates, the cable’s output is
reduced automatically as the subfloor warms, so there is no possibility of failure due
to overheating. Since there is no possibility of overheating, RaySol may be operated
without thermostatic control. Elements of a RaySol system include the heating cable,
termination, splice connections and accessories, controls, power distribution panels,
and the tools necessary for a complete installation.
Pyrotenax MI heating cable can be used for single-phase and three-phase
applications up to 600 V and the cable can be installed in conduit or directly
embedded in sand (recommended), concrete, or compacted fill. For directly
embedded applications, long cable runs can be accommodated allowing frost heave
prevention systems to be designed for large freezers and ice arenas using only a few
circuits. Pyrotenax MI heating cables are rugged factory-terminated cables
(Fig. 6 and Fig. 7) that are engineered to suit your application, power and
configuration requirements. Elements of an MI system include the heating cable,
accessories, controls, power distribution panels, and the tools for a complete
installation.
Typical System
A typical system includes the following:
• RaySol self-regulating heating cable or Pyrotenax MI heating cable
• Connection kits (for RaySol only)
• Junction boxes
• Temperature control and power distribution systems

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Power Connection

Fire Sprinkler System
Freeze Protection

RTD

Roof and Gutter
De-Icing

Heating Cable

Surface Snow
Melting – MI

Mineral insulated

Controller

End Seal

Pipe Freeze Protection
and Flow Maintenance

System Overview

Heating Cable

Fig. 2 Typical freezer frost heave system

The following table lists the heating cable, required connection kits, and accessories
for a RaySol and MI heating cable systems.

Surface Snow
Melting – ElectroMelt

RaySol

Table 1 Heating Cables and Connection Kits

Connection kits
for RaySol
heating cables

RaySol-1
RaySol-2

120 V
208–277 V

HDPE jacketed copper sheath ≤600 V
MI heating cable
FTC-XC
Power connection and end seal
RayClic-E

End seal

FTC-HST

Splice (as required – not for use
inside conduit)

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THERMAL MANAGEMENT SOLUTIONS

Description

Freezer Frost
Heave Prevention

Heating cable

Catalog Number

Freezer Frost Heave Prevention – RaySol and MI Heating Cable System
Self-Regulating Heating Cable Construction
Raychem RaySol self-regulating heating cables are comprised of two parallel
nickel-coated bus wires in a cross-linked polymer core, a tinned copper braid, and a
fluoropolymer outer jacket. These cables are cut to length simplifying the application
design and installation.

Fluoropolymer outer jacket
Tinned-copper braid
Modified polyolefin inner jacket
Self-regulating conductive core
Nickel-plated copper bus wires

Fig. 3 Typical RaySol heating cable construction

At low temperature, At high temperature,
there are many
there are few
conducting paths, conducting paths and
resulting in high output output is correspondand rapid heat-up. Heat ingly lower, conserving
is generated only when it
energy during
is needed and precisely
operation.
where it is needed.

re
g
Se

Power

Constant wattage

lf-

Resistance

At moderate temperature,
there are fewer conducting
paths because the heating
cable efficiently adjusts by
decreasing output,
eliminating any possibility
of overheating.

Constant wattage

lf-

re
g

ing

Temperature

Fig. 4 Self-regulating heating cable technology

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MI Heating Cable Construction

Heating cable construction
Insulation
(magnesium oxide)
Heating
conductor

HDPE jacket

Copper sheath

Insulation
(magnesium oxide)

HDPE jacket
(for copper shealth only)

Heating
conductors

Copper or Alloy 825 sheath

Dual-conductor cable (32, 62 series)

Fig. 5 Typical MI heating cable construction

Types SUA and SUB/FFHP heating cables (Fig. 6) are used for directly embedded
applications, and Type FFHPC heating cables (Fig. 7) are used for installation in
conduit. Type FFHPC heating cables are supplied with a bare copper sheath cold lead
and a 3/4-in NPT reversed gland connector and a pulling eye. The reversed gland
connector provides a seal for the end of the conduit (see Fig. 13 on page 223).
Heated length

Hot/cold
joint

Type SUB and FFHP
Cold lead length
Design B

Heated length

Surface Snow
Melting – ElectroMelt

Cold lead length

NPT threaded
connector

Cold lead length

NPT threaded
connector

Freezer Frost
Heave Prevention

Hot/cold
joint

Surface Snow
Melting – MI

These heating cables are supplied as complete factory-fabricated assemblies
consisting of an MI heating cable that is joined to a section of MI non-heating cold
lead and terminated with NPT connectors. Three configurations are available: Type
SUA consisting of a looped cable joined to a single 7 ft (2.1 m) cold lead with one
1/2-in NPT connector; Type SUB/FFHP consisting of a single run of cable with a
15 ft (4.6 m) cold lead and a 1/2-in NPT connector on each end; and Type FFHPC
consisting of a single run of cable joined to a single 7 ft (2.1 m) cold lead with one
1/2-in NPT connector.

Roof and Gutter
De-Icing

Single-conductor cable (61 series)

Type SUA
Design A

Fire Sprinkler System
Freeze Protection

Pyrotenax MI heating cables used for frost heave prevention applications are
comprised of one or two conductors surrounded by magnesium oxide insulation and
a solid copper sheath with an extruded high density polyethylene (HDPE) jacket or
Alloy 825 stainless steel sheath for directly embedded or in conduit applications.

Pipe Freeze Protection
and Flow Maintenance

System Overview

Fig. 6 Configurations for directly embedded installations

Type FFHPC
Design D
Cold lead length

Heated length

Reversed NPT threaded
gland connector

Fig. 7 Configuration for installation in conduit

Floor Heating

Hot/cold
joint

Pulling eye

Pentair Thermal Management offers all the major components necessary for system
installation. Details of these components and additional accessories can be found
later in this section.

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Freezer Frost Heave Prevention – RaySol and MI Heating Cable System
Approvals
Installation of Raychem RaySol and Pyrotenax MI heating cable systems is governed
by national and local electrical codes. Pentair Thermal Management, the NEC, and
the CEC all require the use of ground-fault protection of equipment to reduce the
risk of fire caused by damage or improper installation.
RaySol system is UL Listed and CSA Certified for use in nonhazardous locations.

-w

MI system is c-CSA-us Certified and FM Approved for use in nonhazardous locations.

-PS

Freezer Frost Heave Prevention Design
This section details the steps necessary to design your application. The examples
provided in each step are intended to incrementally illustrate the project parameter
output for sample designs from start to finish. As you go through each step, use the
appropriate “RaySol and MI Heating Cable in Conduit Freezer Frost Heave Prevention
Design Worksheet” on page 251 and “MI Cables Directly Embedded Freezer Frost
Heave Prevention Design Worksheet” on page 256 to document your project
parameters, so that by that end of this section, you will have the information you
need for your Bill of Materials.
This section contains two major parts:
1. Design Step by Step RaySol and MI Heating Cables in Conduit (see page 211)
2. Design Step by Step MI Heating Cable Directly Embedded (see page 232)
Design Assumptions
When using this guide to design a system you need the following information:
• Size and layout of freezer or ice arena
• Freezer operating temperature
• Insulation R-value
• Supply voltage and phase
• Control recommendations (over-limit thermostat and monitoring)
The information and recommendations in this section are based on the following
design assumptions:
• The information in this guide is based on the application of the RaySol and MI
heating cables in the subfloor on grade only.
• Any size freezer or cold room operating below 32°F (0°C) may experience frost
heaving.
• The heating cable is located in a sub-slab underneath the insulation. (see Fig. 1)
• The heating cable is in conduit embedded in concrete, sand, or soil (or directly
embedded if using MI heating cables). If you are using a different medium, contact
Pentair Thermal Management for an analysis.
For products and applications not covered by this design guide, please contact your
Pentair Thermal Management representative or call Pentair Thermal Management
directly at (800) 545-6258.

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Design Step by Step RaySol and MI Heating Cables in Conduit
This section guides you through the steps necessary to design your system using
RaySol self-regulating or MI heating cables in conduit.

Fire Sprinkler System
Freeze Protection

Your system design requires the following essential steps:

 Determine the freezer configuration
 Select the heating cable

A. RaySol heating cable in conduit

B. MI heating cable in conduit

 Determine the heating cable conduit spacing and freezer load
 Determine the heating cable layout and length
A. RaySol heating cable in conduit

B. MI heating cable in conduit

Roof and Gutter
De-Icing

 Determine the electrical parameters

A. RaySol heating cable in conduit

B. MI heating cable in conduit






Select the connection kits and accessories

Pipe Freeze Protection
and Flow Maintenance

Freezer Frost Heave Prevention Design

Select the control system
Complete the Bill of Materials

The “RaySol and MI Heating Cable in Conduit Freezer Frost Heave Prevention Design
Worksheet” on page 251 is included to help you document the project parameters
that you will need for your project’s Bill of Materials.

Surface Snow
Melting – MI

Select the power distribution

Surface Snow
Melting – ElectroMelt
Freezer Frost
Heave Prevention
Floor Heating

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Freezer Frost Heave Prevention – RaySol and MI Heating Cable System

1. Determine the
freezer configuration
2. Select the heating
cable
3. Determine
heating cable
conduit spacing
and freezer load
4. Determine the
heating cable
layout and length
5. Determine the
electrical parameters
6. Select the
connection kits
and accessories
7. Select the control
system
8. Select the power
distribution

Step  Determine the freezer configuration
gathering information

The following information is required to complete the freezer frost heave prevention
system design.
• Size and layout of freezer or ice arena
• Freezer operating temperature
• Insulation R-value
• Supply voltage (single-phase)
• Control requirements
Prepare scale drawing

Draw to scale the floor area to be heated. Carefully note the limits of the area to
be heated. Show all concrete joints on the drawing and note the location and size
of obstacles, such as floor drains, pipe penetrations, conduit runs (if required),
columns, fixtures, and voltage supply location.
40'
(12.2 m)

9. Complete the Bill
of Materials

Side A

Freezer Frost Heave
Prevention System
Design Steps (in Conduit)

80'
(24.4 m)

Side B
Fig. 8 Typical freezer example
Determine the freezer operating temperature

Determine the temperature at which your freezer operates. If it operates at more
than one temperature, or if the operating temperature may be changed in the future,
base the spacing selection on the lowest anticipated operating temperature.
Record insulation R-value

The insulation R-value is the thermal resistance of the floor’s insulation. Normally
the R-value will be printed on the insulation material. If that is not the case, you can
calculate it by dividing the insulation thickness in inches by the insulation thermal
conductivity.

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Example: RaySol and MI heating cables in conduit
80 ft x 40 ft = 3200 ft2
(24.4 m x 12.2 m = 297 m2)

Freezer operating temperature

–20°F (–29°C)

Insulation R-value

R-40 (40 ft2·°F·hr/Btu)

Supply voltage

208 V, single-phase

Fire Sprinkler System
Freeze Protection

Freezer Frost Heave
Prevention System
Design Steps (in Conduit)

Area

Step  Select the heating cable

1. Determine the
freezer configuration

3. Determine
heating cable
conduit spacing
and freezer load
4. Determine the
heating cable
layout and length

The heating cable you select will depend on your system:
A. RaySol heating cable in conduit
B. MI heating cable in conduit
Step 2a: For RaySol heating cable in conduit

Select the heating cable based on the operating voltage determined in Step 1. For
120 volts, select RaySol-1; for 208/240/277 V, select RaySol-2.
Table 2 RaySol Heating Cable
Supply voltage

Catalog number

6. Select the
connection kits
and accessories

120 V

RaySol-1

208–277 V

RaySol-2

8. Select the power
distribution
9. Complete the Bill
of Materials

Surface Snow
Melting – MI

5. Determine the
electrical parameters

7. Select the control
system

Roof and Gutter
De-Icing

2. Select the heating
cable

Pipe Freeze Protection
and Flow Maintenance

Freezer Frost Heave Prevention Design

Example: RaySol heating cables in conduit
Supply voltage

208 V (from Step 1)

Catalog number

RaySol-2

Step 2B: For MI heating cable in conduit

If your freezer is longer than 104 ft (32 m), or the supply voltage is different than
those listed, or the system will be powered from a three-phase supply, please
contact your Pentair Thermal Management representative or Pentair Thermal
Management at (800) 545- 6258 for a custom design.

Freezer Frost
Heave Prevention

If it is not possible to install the conduit runs parallel to the freezer length (Side A),
then select the heating cable based on the freezer width (Side B).

Surface Snow
Melting – ElectroMelt

Select the heating cable from Table 3 based on the operating voltage from Step 1 and
the freezer length. The freezer length must be equal to or within the minimum and
maximum “Freezer length” shown in the shaded columns. For the example in Fig. 8,
under 208 V, select the heating cable that corresponds to the Minimum (80 ft/24.4 m)
and Maximum (84 ft/25.6 m) “Freezer length” in the shaded columns.

Floor Heating

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Freezer Frost Heave Prevention – RaySol and MI Heating Cable System
Table 3 Selection Table for MI Heating Cables in Conduit

Catalog
number

Power
output

Min
(ft)

Max
(ft)

Min
(m)

Max
(m)

(ft)

(m)

(W)

Heating
cable
current
(A) 1

4.6

5.8

4.6

105

0.9

Freezer length

Heated length

120 V
FFHPC1
FFHPC2

6.1

7.3

6.1

120

1.0

FFHPC3

7.6

8.8

7.6

145

1.2

FFHPC4

9.1

10.4

9.1

175

1.5

FFHPC5

10.7

11.9

10.7

240

2.0

FFHPC6

12.2

13.4

12.2

315

2.6

FFHPC7

13.7

14.9

13.7

280

2.3

FFHPC8

15.2

16.5

15.2

360

3.0

FFHPC9

16.8

18.0

16.8

330

2.8

FFHPC10

18.3

19.5

18.3

400

3.3

FFHPC11

19.8

21.0

19.8

370

3.1

FFHPC12

21.3

22.6

21.3

515

4.3

FFHPC13

22.9

24.1

22.9

480

4.0

FFHPC14

24.4

25.6

24.4

450

3.8

FFHPC15

25.9

27.1

25.9

565

4.7

FFHPC16

27.4

28.7

27.4

535

4.5

FFHPC17

29.0

30.2

29.0

750

6.3

FFHPC18

100

104

30.5

31.7

100

30.5

720

6.0

208 V
FFHPC19

7.6

8.8

7.6

155

0.7

FFHPC20

9.1

10.4

9.1

190

0.9

FFHPC21

10.7

11.9

10.7

205

1.0

FFHPC22

12.2

13.4

12.2

270

1.3

FFHPC23

13.7

14.9

13.7

350

1.7

FFHPC24

15.2

16.5

15.2

315

1.5

FFHPC25

16.8

18.0

16.8

390

1.9

FFHPC26

18.3

19.5

18.3

425

2.0

FFHPC27

19.8

21.0

19.8

390

1.9

FFHPC28

21.3

22.6

21.3

540

2.6

FFHPC29

22.9

24.1

22.9

505

2.4

FFHPC30

24.4

25.6

24.4

475

2.3

FFHPC31

25.9

27.1

25.9

635

3.1

FFHPC32

27.4

28.7

27.4

600

2.9

FFHPC33

29.0

30.2

29.0

570

2.7

FFHPC34

100

104

30.5

31.7

100

30.5

720

3.5

1 Single-phase current shown

Tolerance on cable length is –0% to +1%.
All heating cables supplied with 3/4-in NPT reversed gland and pulling eye.
Type FFHPC cables supplied with 7 ft (2.1 m) long cold lead.

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Table 3 Selection Table for MI Heating Cables in Conduit
Freezer length
Min
(ft)

Max
(ft)

Min
(m)

Max
(m)

(ft)

Power
output

(m)

(W)

Heating
cable
current
(A) 1

277 V
FFHPC35

9.1

10.4

9.1

230

0.8

FFHPC36

10.7

11.9

10.7

240

0.9

FFHPC37

12.2

13.4

12.2

255

0.9

FFHPC38

13.7

14.9

13.7

285

1.0

15.2

16.5

15.2

380

1.4

16.8

18.0

16.8

350

1.3

FFHPC41

18.3

19.5

18.3

465

1.7

FFHPC42

19.8

21.0

19.8

430

1.6

FFHPC43

21.3

22.6

21.3

400

1.4

FFHPC44

22.9

24.1

22.9

500

1.8

FFHPC45

24.4

25.6

24.4

480

1.7

FFHPC46

25.9

27.1

25.9

530

1.9

27.4

28.7

27.4

500

1.8

29.0

30.2

29.0

700

2.5

FFHPC49

100

104

30.5

31.7

100

30.5

670

2.4

Surface Snow
Melting – MI

FFHPC47
FFHPC48

Roof and Gutter
De-Icing

FFHPC39
FFHPC40

Fire Sprinkler System
Freeze Protection

Catalog
number

Heated length

Pipe Freeze Protection
and Flow Maintenance

Freezer Frost Heave Prevention Design

1 Single-phase current shown

Tolerance on cable length is –0% to +1%.
All heating cables supplied with 3/4-in NPT reversed gland and pulling eye.
Type FFHPC cables supplied with 7 ft (2.1 m) long cold lead.

Example: MI heating cables in conduit
208 V

Freezer (Side A) length

80 ft (24.4 m) (from Step 1)

Catalog number

FFHPC30

Power output

475 W

Surface Snow
Melting – ElectroMelt

Supply voltage

Freezer Frost
Heave Prevention
Floor Heating

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Freezer Frost Heave Prevention – RaySol and MI Heating Cable System
Freezer Frost Heave
Prevention System
Design Steps (in Conduit)
1. Determine the
freezer configuration
2. Select the heating
cable
3. Determine
heating cable
conduit spacing
and freezer load
4. Determine the
heating cable
layout and length
5. Determine the
electrical parameters

Step  Determine the heating cable conduit spacing and freezer load
For RaySol and MI cable Systems

In this step you will determine the conduit spacing, and freezer loads for the RaySol
or MI heating cable systems. Use the freezer operating temperature and the floor
insulation R-value to select the correct spacing shown in Table 4. If your calculated
R-value or freezer operating temperature does not match the values in the table, use
the values that give the closer spacing.
Within each cell in Table 4, there are two numbers: conduit spacing and freezer load.
Freezer load is the additional cooling load imposed on the cooling system by the
freezer frost heave prevention heating cable. It is the heat transferred through the
insulation into the freezer, expressed in W/ft2 (W/m2) of floor area.

6. Select the
connection kits
and accessories
7. Select the control
system
8. Select the power
distribution
9. Complete the Bill
of Materials

Table 4 RaySol and MI Conduit Spacing and Freezer Load
Floor insulation R-value
(ft2·°F·hr/Btu)

Freezer operating
temperature
30°F (–1°C)
20°F (–7°C)
10°F (–12°C)
0°F (–18°C)
–10°F (–23°C)
–20°F (–29°C)
–30°F (–34°C)
–40°F (–40°C)

R-10

R-20

R-30

R-40

Conduit spacing

in (cm)

96 (244)

Freezer load

W/ft2 (W/m2)

0.7 (8)

0.4 (4)

0.3 (3)

0.2 (2)

Conduit spacing

in (cm)

81 (206)

96 (244)

Freezer load

W/ft2 (W/m2)

0.8 (9)

0.5 (5)

0.3 (3)

Conduit spacing

in (cm)

63 (160)

96 (244)

Freezer load

W/ft2 (W/m2)

1.0 (11)

0.6 (6)

0.4 (4)

0.3 (3)

Conduit spacing

in (cm)

51 (130)

84 (213)

96 (244)

Freezer load

W/ft2 (W/m2)

1.2 (13)

0.8 (9)

0.5 (5)

0.4 (4)

Conduit spacing

in (cm)

42 (107)

72 (183)

96 (244)

Freezer load

W/ft2 (W/m2)

1.5 (16)

0.8 (9)

0.6 (6)

0.5 (5)

Conduit spacing

in (cm)

(91)

63 (160)

87 (221)

96 (244)

Freezer load

W/ft2 (W/m2)

1.8 (19)

1.0 (11)

0.6 (6)

0.5 (5)

Conduit spacing

in (cm)

(84)

57 (145)

78 (198)

93 (236)

Freezer load

W/ft2 (W/m2)

2.0 (22)

1.1 (12)

0.8 (9)

0.6 (6)

Conduit spacing

in (cm)

(76)

51 (130)

69 (175)

84 (213)

Freezer load

W/ft2 (W/m2)

2.3 (25)

1.2 (13)

0.8 (9)

0.7 (8)

Example: RaySol and MI heating cables in conduit

216

Freezer operating temperature

–20°F (–29°C) (from Step 1)

Insulation R-value

R-40 (40 ft2·°F·hr/Btu) (from Step 1)

Conduit spacing

96 in (244 cm)

Freezer load

0.5 W/ft2 (5 W/m2)

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THERMAL MANAGEMENT SOLUTIONS

Freezer Frost Heave
Prevention System
Design Steps (in Conduit)

Step  Determine the heating cable layout and length

1. Determine the
freezer configuration

3. Determine
heating cable
conduit spacing
and freezer load
4. Determine the
heating cable
layout and length

6. Select the
connection kits
and accessories
7. Select the control
system
8. Select the power
distribution
9. Complete the Bill
of Materials

To calculate the number of conduit runs and heating cable length from your scaled
drawing, refer to Fig. 9 and Fig. 10.
Define Side “A” as the side that is parallel to the conduit runs. Side “A” cannot be
greater than the maximum circuit length for RaySol (Table 5).
Define Side “B” as the side that is perpendicular to the conduit runs. Refer to Fig. 9
and Fig. 10 for examples of Side A and Side B.
Two basic types of heating cable layouts are used:
1. The hairpin layout (Fig. 9) is used both in smaller freezers where it results in
material and labor savings over the straight run layout (Fig. 10), and in other
freezers where only one wall of the freezer is accessible for mounting junction
boxes.

Roof and Gutter
De-Icing

5. Determine the
electrical parameters

Estimate number of conduit runs

Fire Sprinkler System
Freeze Protection

2. Select the heating
cable

Step 4A For RaySol heating cable in conduit

Pipe Freeze Protection
and Flow Maintenance

Freezer Frost Heave Prevention Design

2. The straight run layout (Fig. 10) is used when the freezer dimension exceeds
one-half the maximum heating cable circuit length (insufficient heating cable
allowed for a run down and back).

Side A

Surface Snow
Melting – ElectroMelt

Junction
boxes

Side B

Fig. 9 Hairpin layout

Fig. 10 Straight run layout

Freezer Frost
Heave Prevention

Junction
boxes

Surface Snow
Melting – MI

Junction
boxes

Calculate the number of estimated conduit runs as follows:
Estimated number of conduit runs =

Side B (ft) x 12
Floor Heating

Conduit spacing (in)
Side B (m) x 100

Conduit spacing (cm)

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Freezer Frost Heave Prevention – RaySol and MI Heating Cable System
Round the estimated number of conduit runs to the next larger whole number. For
example, if the result is 7.4, then 8 conduit runs are required. It may be necessary to
recalculate the conduit spacing following this step.
Example: RaySol heating cables in conduit
Side B length
Conduit spacing

40 ft (12.2 m) (from Step 1)
96 in (244 cm) (from Step 3)

Number of conduit runs
Side B x 12 / spacing (in)
Side B x 100 / spacing (cm)

40 ft x 12 / 96 in = 5
12.2 m x 100 / 244 cm = 5

Estimate the heating cable length required for conduit runs
Multiply the conduit length (Side A) by the number of conduit runs to determine the
length of heating cable required for the freezer area.
Heating cable length

Conduit length (Side A) x number of conduit runs

Example: RaySol heating cables in conduit (continued)
Heating cable length required

80 ft (24.4 m) x 5 = 400 ft (122 m)

Determine the maximum circuit length for the heating cable length and layout
For the appropriate supply voltage, use Table 5 to select the maximum circuit length
which is closest to, but greater than the length calculated. Select the smallest
appropriate circuit breaker size.
Table 5 RaySol Maximum Circuit Lengths in Feet (Meters)
Supply voltage
Circuit
breaker size
(A)

120 V

208 V

240 V

277 V

180

54.9

305

93.0

335

102.1

375

114.3

240

73.2

410

125.0

450

137.2

500

152.4

240

73.2

410

240

73.2

410

125.0
125.0

450

137.2

500

152.4

450

137.2

500

152.4

If the heating cable length required is greater than the maximum circuit length,
multiple circuits must be used.
When Side A x 2 is less than or equal to the maximum circuit length, then the conduit
run can be looped into the hairpin layout (Fig. 9). In a hairpin configuration, when you
have an odd number of conduit runs, one run will be a straight run as shown in Fig.
11.

218

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THERMAL MANAGEMENT SOLUTIONS

Side A

Fire Sprinkler System
Freeze Protection

80'
(24.4 m)

Pipe Freeze Protection
and Flow Maintenance

Freezer Frost Heave Prevention Design

Roof and Gutter
De-Icing

Junction
boxes

40'
(12.2 m)

Surface Snow
Melting – MI

Side B (two hairpins and one straight run)
Fig. 11 Layout for example

Example: RaySol heating cables in conduit (continued)
400 ft (122 m)

Supply voltage

208 V (from Step 1)

Maximum circuit length

410 ft (125 m) (from Table 5)

Number of circuits

Power supply

One 20 A circuit breaker
Run in two hairpin loops and one straight run
(see Fig. 11)

Ground-Fault Protection
A 30-mA ground-fault protection device (GFPD) must be used to provide protection
from arcing or fire, and to comply with warranty requirements, agency certifications,
and national electrical codes. If the heating cable is improperly installed, or
physically damaged, sustained arcing or fire could result. If arcing does occur, the
fault current may be too low to trip conventional circuit breakers.

Surface Snow
Melting – ElectroMelt

Heating cable length required

Freezer Frost
Heave Prevention
Floor Heating

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Freezer Frost Heave Prevention – RaySol and MI Heating Cable System
Determine additional heating cable allowance
Additional heating cable is required to make power connections and to route the
circuits to junction boxes. This extra heating cable shall not be considered when
determining the maximum heating cable length for circuit breaker sizing. In order to
estimate the total heating cable length, you will need to take the heating cable length
you already calculated, and then add heating cable allowances, as follows:
Estimated total heating cable length = Required heating cable + End allowances + Connection kit
allowances

Table 6 RaySol Additional Heating Cable Allowance
Heating cable
allowance

Description

Hairpin layout

End allowances

From end of conduit 8 ft per hairpin
to junction box
conduit

Connection kit
allowances

Required to
assemble the
connection kit

4 ft per kit

Straight run layout
8 ft per straight run
conduit
4 ft per kit

The end allowance is the length of heating cable installed in protective conduit
between the heated floor and the power connection junction box. The connection
kit allowance (usually 2 ft per end) is the length of heating cable inside the power
connection junction box.
Example: RaySol heating cables in conduit (continued)
Heating cable length required

400 ft (122 m)

End allowance

2 hairpin runs = 16 ft (4.9 m)
1 straight run = 8 ft (2.4 m)

Connection kit allowance

2 hairpin runs (2 FTC-XC kits) = 8 ft (2.4 m)
1 straight run (1 FTC-XC kit) = 4 ft (1.2 m)

Total heating cable allowance

[16 ft (4.9 m) + 8 ft (2.4 m)] + [8 ft (2.4 m) +
4 ft (1.2 m)] = 36 ft (11 m)

Total heating cable length required 400 ft (122 m) + 36 ft (11 m)

= 436 ft (133 m) of RaySol-2
Locate the junction boxes for a RaySol heating cable system
The heating cable connects to the branch circuit wiring in a junction box using a
Raychem FTC-XC power connection and end seal kit. The heating cable is routed
from the subfloor to a junction box located above grade through protective conduit.
In most freezer frost heave prevention applications, separate junction boxes are used
for the power connection and end seal.

220

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THERMAL MANAGEMENT SOLUTIONS

Lay out heating cable runs, circuits, and junction boxes
After determining the approximate total length of heating cable, the number of
circuits, and the junction box location, do a trial layout. In making the trial layout,
follow these recommendations:
• Do not design more than one run of heating cable per conduit.
• Arrange the conduit so it uniformly covers the area to be heated.
• Maintain the design conduit spacing within 4 in (10 cm).
• Do not extend the heating cable beyond the room or area in which it originates.
• Do not cross expansion or other subfloor joints.

• Do not exceed the maximum circuit length allowed on a branch circuit breaker as
given in Table 5.
• The maximum length of heating cable that can be pulled through conduit is
500 feet (150 m). The maximum total degree of conduit turn is 360 degrees.
• When the combined lengths of two or more circuit runs are less than the maximum circuit length allowed, these runs can be combined in parallel on one circuit
breaker.

Reconfigure the trial circuit layout until the design meets all of the previous
recommendations. Assign each circuit to a circuit breaker in a specific panel board
and record each circuit length.

Surface Snow
Melting – MI

Record circuit information

Roof and Gutter
De-Icing

• Do not route the conduit closer than 4 in (10 cm) to the edge of the subfloor,
drains, anchors, or other material in the concrete.

Fire Sprinkler System
Freeze Protection

• Start and end each circuit in a junction box.

Pipe Freeze Protection
and Flow Maintenance

Freezer Frost Heave Prevention Design

Surface Snow
Melting – ElectroMelt
Freezer Frost
Heave Prevention
Floor Heating

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Freezer Frost Heave Prevention – RaySol and MI Heating Cable System
Step 4B For MI heating cable in conduit

Estimate number of conduit runs
MI cables in conduit can only be installed using the straight run layout shown in
Fig. 12.
40'
(12.2 m)

96"
(244 cm)
typ

Side A

Conduit cap

48"
(122 cm)
typ

80'
(24.4 m)

Junction
boxes

Side B
Fig. 12 Layout for straight run example

To calculate the number of conduit runs from your scaled drawing, refer to Fig. 12,
and calculate as follows:
Estimated number of conduit runs =

Side B (ft) x 12

Conduit spacing (in)
Side B (m) x 100

Conduit spacing (cm)
Round the estimated number of conduit runs to the next larger whole number. For
example, if the result is 7.4, then 8 conduit runs are required. It may be necessary to
recalculate the conduit spacing following this step.
Note: If the heating cable was selected using the freezer width (Side B) in Step 2, use
Side A in the above formula.

222

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THERMAL MANAGEMENT SOLUTIONS

Example: MI heating cables in conduit
Side B length

40 ft (12.2 m) (from Step 1)

Conduit spacing

96 in (244 cm) (from Step 3)

Side B x 12 / spacing (in)

40 ft x 12 / 96 in = 5

Side B x 100 / spacing (cm)

12.2 m x 100 / 244 cm = 5

Fire Sprinkler System
Freeze Protection

Number of conduit runs

Determine the number of MI heating cables
Number of heating cables required = Number of conduit runs
Example: MI heating cables in conduit (continued)
Heating cable

Pipe Freeze Protection
and Flow Maintenance

Freezer Frost Heave Prevention Design

FFHPC30 (from Step 2)
5

Number of heating cables required

Locate the junction boxes for an MI heating cable system
Pyrotenax MI heating cables are factory terminated with 7 ft (2.1 m) long non-heating
cold leads, making it possible to connect two or three heating cables to a single
junction box. A Pyrotenax D1297TERM4 may be used where two heating cables are
connected in parallel. A junction box is only required for the power connection end.

After determining the number of heating cables required, the number of circuits, and
the junction box locations, do a trial layout. In making the trial layout, follow these
recommendations:

Surface Snow
Melting – MI

Lay out the MI heating cable runs, circuits, and junction boxes

Roof and Gutter
De-Icing

Number of conduit runs

• The conduits must be laid out in straight runs as shown in Fig. 12.
• Where cable lengths exceed 50 ft (15.2 m), the conduit must be accessible from
both ends to allow long runs of cable to be pulled into the conduit.

• Arrange the conduits so that they uniformly cover the area to be heated.
• Maintain the design conduit spacing within 4 in (10 cm).
• Do not cross expansion or other subfloor joints.
• Do not route the conduit closer than 4 in (10 cm) to the edge of the subfloor,
drains, anchors, or other material in the concrete.

Reversed
gland

Conduit
cap

Female
NPT fitting
12 in (30 cm)
radius

12 in (30 cm)
radius

Conduit / pipe

End
cap

Floor Heating

Hot/cold joint

Freezer Frost
Heave Prevention

Cold
lead

Pulling
eye

Fig. 13 Installation where conduit ends stub-up

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Surface Snow
Melting – ElectroMelt

• If it is necessary to stub-up the ends of the conduit, use a minimum 12 in (30 cm)
radius as shown in Fig. 13.

Step  Determine the electrical parameters
5A For RaySol heating cable in conduit

Determine number of circuits
For RaySol, the circuit breaker sizing was determined in Step 4 using Table 5. Record
the number and ratings of the circuit breakers to be used on the worksheet.
A 30-mA ground-fault protection device (GFPD) must be used to provide protection
from arcing or fire, and to comply with warranty requirements, agency certifications,
and national electrical codes. If the heating cable is improperly installed, or
physically damaged, sustained arcing or fire could result. If arcing does occur, the
fault current may be too low to trip conventional circuit breakers.
WARNING: To minimize the danger of fire from sustained electrical arcing if
the heating cable is damaged or improperly installed, and to comply with the
requirements of Pentair Thermal Management, agency certifications, and national
electrical codes, ground-fault equipment protection must be used on each heating
cable branch circuit. Arcing may not be stopped by conventional circuit protection.
Determine transformer load
The total transformer load is the sum of the loads on all the circuit breakers in the
system.
Calculate the Circuit Breaker Load (CBL) as:
CBL (kW) =

Circuit breaker rating (A) x 0.8 x Supply voltage
1000

Calculate the Total Transformer Load as follows:
Total Transformer Load (kW) = CBL1 + CBL2 + CBL3...+ CBLN
Example: RaySol heating cables in conduit

224

Circuit breaker size

One 20 A circuit (from Step 4)

Supply voltage

208 V (from Step 1)

Circuit breaker load

(20 A x 0.8 x 208) / 1000 = 3.3 kW

Total transformer load

3.3 kW

EN-FreezerFrostHeavePrevention-DG-H58139

11/13

THERMAL MANAGEMENT SOLUTIONS

5B For MI heating cable in conduit

Determine number of circuits
Refer to Table 3 to determine the Amps for the selected heating cable. Next,
calculate the total Amps to determine the circuit breaker requirements, as follows:
Total Amps = Amps per cable x Number of heating cables required

A 30-mA ground-fault protection device (GFPD) must be used to provide protection
from arcing or fire, and to comply with warranty requirements, agency certifications,
and national electrical codes. If the heating cable is improperly installed, or
physically damaged, sustained arcing or fire could result. If arcing does occur, the
fault current may be too low to trip conventional circuit breakers.

Surface Snow
Melting – MI

Roof and Gutter
De-Icing

From the Total Amps, determine the most appropriate circuit breaker size and
number of circuit breakers.

Fire Sprinkler System
Freeze Protection

For MI heating cable, the power output and current draw is shown in Table 3. Heating
cables may be individually connected to circuit breakers, but to reduce the number
of circuits, cables may be connected in parallel. When connecting heating cables
in parallel, total the individual heating cable currents to 80% of the circuit breaker
rating.

Pipe Freeze Protection
and Flow Maintenance

Freezer Frost Heave Prevention Design

Determine transformer load
The total transformer load is the sum of the loads in the system. Calculate the Total
Transformer Load as follows:
Cable1 (W) + Cable2 (W) + Cable3 (W)... + CableN (W)

Surface Snow
Melting – ElectroMelt

Transformer load (kW) =

1000

Example: MI heating cables in conduit
Amps/cable

2.3 A (from Table 3)

Total Amps
2.3 A x 5 = 11.5 A (5 cables wired in parallel on one
circuit)
15 A circuit breaker, 80% loading 12 A

Number of circuit breakers

Cable power output

475 W (from Step 2)

Number of cables

5 (from Step 4)

Total Transformer load

(475 W x 5) / 1000 = 2.4 kW

Freezer Frost
Heave Prevention

Circuit breaker size

Record the number and ratings of the circuit breakers to be used and total
transformer load on the worksheet.
Floor Heating

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225

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Freezer Frost Heave Prevention – RaySol and MI Heating Cable System
Freezer Frost Heave
Prevention System
Design Steps (in Conduit)

Step  Select the connection kits and accessories

1. Determine the
freezer configuration

For RaySol systems, determine the number of junction boxes, power connections,
end seals and splice kits required.

2. Select the heating
cable

• Hairpin and straight layouts have one junction box per conduit end (see Fig. 9 and
Fig. 10).

3. Determine
heating cable
conduit spacing
and freezer load

For MI systems, determine the number of junction boxes required.

4. Determine the
heating cable
layout and length

Select junction box

• Straight run layout has one junction box per conduit run (see Fig. 12 for MI cable).

For RaySol and MI cable, use a UL Listed and/or CSA Certified junction box that is
suitable for the location. Use a box with minimum internal volume of 16 cubic inches
if the box is metallic and 19 cubic inches if the box is not metallic. Metal junction
boxes, such as the Pyrotenax D1297TERM4, are recommended for MI cable.

5. Determine the
electrical parameters
6. Select the
connection kits
and accessories
7. Select the control
system
8. Select the power
distribution
9. Complete the Bill
of Materials

Table 7 Connection Kits and Accessories
Catalog
number

Description

Standard
packaging

Usage

Power connection and end seal.

1 per conduit run

RaySol Connection Kits
FTC-XC

(Junction box not included)

FTC-HST

Low-profile splice/tee

As required (for use
inside intermediate
pull box or cable
tray)

RayClic-E

Extra end seal

Replacement end
seal

Accessories
D1297TERM4

A cast aluminum junction box (NEMA 3) for installation in nonhazardous and CID2 locations. Three 1/2-in
NPT entries on bottom, provided with plugs. Includes
4-pole terminal block (CSA - 600 V, 65 A, 18 - 6 AWG;
UL - 300 V, 65 A, 18 - 6 AWG). External mounting feet.
CSA approved for Class I, Div. 2, Groups A, B, C, and D.
(for MI only)

For MI systems
only

Enclosure dimensions: 6 in x 6 in x 4 in (150 mm x
150 mm x 100 mm).

226

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THERMAL MANAGEMENT SOLUTIONS

Example: RaySol heating cables in conduit
FTC-XC

Quantity

Junction box

Contractor supplied

Quantity

Fire Sprinkler System
Freeze Protection

Power connection and end seal kit

Example: MI heating cables in conduit
D1297TERM

Quantity

Step  Select the control system

1. Determine the
freezer configuration
2. Select the heating
cable
3. Determine
heating cable
conduit spacing
and freezer load

5. Determine the
electrical parameters
6. Select the
connection kits
and accessories

Table 8 Temperature Control Options
Features
Number of heating
cable circuits
Sensor

DigiTrace
ECW-GF

DigiTrace
C910-485 2

DigiTrace
ACS-30

Single

Multiple

Thermistor

RTD 1

See data sheet

25 ft

Varies

Set point range

–0°F to 200°F
(–18°C to 93°C)

8. Select the power
distribution

32°F to 200°F
(0°C to 93°C)

Enclosure

NEMA 4X

Deadband

2°F to 10°F
(2°C to 6°C)
–40°F to 140°F
(–40°C to 60°C)

1°F to 10°F
(1°C to 6°C)
–40°F to 140°F
(–40°C to 60°C)

9. Complete the Bill
of Materials

Enclosure limits

30 A

Switch type

DPST

100–277 V

c-UL-us

c-CSA-us

30 mA fixed

20 mA to 100 mA
(adjustable)

AC relay

2 A at 277 Vac

100–277 V,
0.75 A max.

Dry contact relay

2 A at 48 Vdc

48 Vac/dc, 500 mA
max.

Approvals
Ground-fault
protection

Freezer Frost
Heave Prevention

Switch rating
Electrical rating

Surface Snow
Melting – ElectroMelt

Sensor length

7. Select the control
system

Alarm outputs

BMS using DigiTrace ProtoNode multi-protocol gateways

11/13

227

Technical Data
Sheets

EN-FreezerFrostHeavePrevention-DG-H58139

Floor Heating

1 Ordered separately
2 The C910-485 is available to provide RS-485 communication capability. Connect to the

THERMAL MANAGEMENT SOLUTIONS

Surface Snow
Melting – MI

4. Determine the
heating cable
layout and length

The following control systems are suitable for both RaySol and MI heating cable frost
heave protection systems. For MI cable, a temperature controller must be used to
maintain the subfloor temperature at 40°F (5°C). For RaySol or MI heating cable
installations where temperature control and temperature monitoring is desired, a
Pentair Thermal Management DigiTrace C910-485 or DigiTrace ACS-30 controller is
recommended.

Roof and Gutter
De-Icing

Freezer Frost Heave
Prevention System
Design Steps (in Conduit)

Junction box

Pipe Freeze Protection
and Flow Maintenance

Freezer Frost Heave Prevention Design

Freezer Frost Heave Prevention – RaySol and MI Heating Cable System
Table 9 Control Systems
Catalog number

Description

Electronic thermostats and accessories
ECW-GF

Electronic ambient sensing controller with 30-mA ground-fault protection. The controller can be programmed to maintain temperatures up to 200°F (93°C) at voltages from
100 to 277 V and can switch current up to 30 Amperes. The ECW-GF is complete with
a 25-ft (7.6-m) temperature sensor and is housed in a Type 4X rated enclosure. The
controller features an AC/DC dry alarm contact relay.
An optional ground-fault display panel (ECW-GF-DP) can be added to provide groundfault or alarm indication in applications where the controller is mounted in inaccessible
locations.

ECW-GF-DP

MI-GROUND-KIT

An optional remote display panel (ECW-GF-DP) can be added to provide ground-fault
or alarm indication in applications where the controller is mounted in inaccessible
locations.

Grounding kit for nonmetallic enclosures (for MI only)

Electronic controllers and sensors

A0
A1
A2
A3
A4
A5
A6
A7

C910-485

The DigiTrace C910-485 is a compact, full featured, microprocessor-based, single-point
commercial heating cable controller. The C910-485 provides control and monitoring
of electrical heating cable circuits for commercial heating applications, with built-in
ground-fault protection. The C910-485 can be set to monitor and alarm for high and low
temperature, high and low current, ground-fault level, and voltage. Communications
modules are available for remote control and configuration.

ACS-UIT2
ACS-PCM2-5

The DigiTrace ACS-30 Advanced Commercial Control System is a multipoint electronic
control and monitoring system for heat-tracing used in various commercial applications such as pipe freeze protection, roof and gutter de-icing, surface snow melting, hot
water temperature maintenance and floor heating. The DigiTrace ACS-30 system can
control up to 260 circuits with multiple networked ACS-PCM2-5 panels, with a single
ACS-UIT2 user interface terminal. The ACS-PCM2-5 panel can directly control up to
5 individual heat-tracing circuits using electro-mechanical relays rated at 30 A up to
277 V.

ProtoNode-LER
ProtoNode-RER

The DigiTrace ProtoNode is an external, high performance multi-protocol gateway for
customers needing protocol translation between Building Management Systems (BMS)
and the DigiTrace ACS-30 or C910-485 controllers.

PROTOCESSOR
SERIAL ETHERNET

PROTONODE

B0
B1
B2
B3
S0
S1
S2
S3

By FieldServer Technologies
www.ProtoCessor.com

RS 485 GND
RS 485 RS 485+

The ProtoNode-LER is for LonWorks® systems; and the ProtoNode-RER is for
BACnet® or Metasys® N2 systems.

+PWR
- PWR
FRAME GND

RTD10CS
RTD-200
RTD50CS

Example: RaySol and MI heating cables in conduit

228

Electronic thermostat

DigiTrace C910-485

Quantity

EN-FreezerFrostHeavePrevention-DG-H58139

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THERMAL MANAGEMENT SOLUTIONS

Freezer Frost Heave
Prevention System
Design Steps (in Conduit)

Step  Select the power distribution

1. Determine the
freezer configuration

Pipe Freeze Protection
and Flow Maintenance

Freezer Frost Heave Prevention Design

For Raysol and MI Heating Cable in conduit

• Directly to the power connection kits (RaySol only)
• Directly through the temperature controller

3. Determine
heating cable
conduit spacing
and freezer load

• Through external contactors or through HTPG power distribution panels
Single circuit control

4. Determine the
heating cable
layout and length

6. Select the
connection kits
and accessories

RaySol systems without temperature control can be connected directly to the power
connection kits from the ground-fault circuit breakers in subpanels.

7. Select the control
system

Group control

8. Select the power
distribution

If the controller will activate multiple circuits (group control) then an external
contactor must be used (Fig. 14).

Roof and Gutter
De-Icing

5. Determine the
electrical parameters

Heating cable circuits that do not exceed the current rating of the selected controller
can be switched directly (Fig. 14). When the total electrical load exceeds the rating of
the controller, an external contactor is required.

Fire Sprinkler System
Freeze Protection

Power to the heating cables can be provided in several ways:

2. Select the heating
cable

9. Complete the Bill
of Materials

Surface Snow
Melting – MI

Single circuit control

Group control
Temperature
controller

Heating
cable

1-pole
GFEP breaker

ø supply
N

ø
ø
ø

Heating cable
sheath, braid
or ground

3-phase 4-wire
supply (WYE)

Contactor

3-pole main
breaker

Surface Snow
Melting – ElectroMelt

Temperature
controller

1 ø supply
N

Freezer Frost
Heave Prevention

G
Heating cable
sheath, braid
or ground

Fig. 14 Single circuit and group control

Floor Heating

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Freezer Frost Heave Prevention – RaySol and MI Heating Cable System
Large systems with many circuits should use an HTPG power distribution panel. The
HTPG is a dedicated power-distribution, control, ground-fault protection, monitoring,
and alarm panel for freeze protection and broad temperature-maintenance
heat-tracing applications. This enclosure contains an assembled circuit-breaker
panelboard. Panels are equipped with ground-fault circuit breakers with or
without alarm contacts. The group control package allows the system to operate
automatically in conjunction with a temperature control system.
Alarm horn (optional)
Door
disconnect
(optional)

Main circuit
breaker

Push button for
light testing

R AR

Alarm relay
(optional)

COMMON ALARM
PUSH TO ACKNOWLEDGE

Selector switch

TB 1

Distribution
panelboard

Main
contactor

Fuse holder

POWER ON
C

Terminals
(optional)

HAND/OFF/AUTO

Ground
bus bar

TB 2

Alarm option shown above

Fig. 15 HTPG power distribution panel

Three-phase, 4 wire supply (Wye)

Ø1 Ø2Ø3 N G
Three-pole main
circuit breaker
Three-pole main
contactor

Hand

Off

Contactor
coil

Auto

External controller/
thermostat*

Panel
energized

One-pole with 30-mA
ground-fault trip
(120/277 Vac)

Alarm
remote
annunciation
(with alarm
option)

Power
connection
Heating cable
End seal
Heating
cable
circuit
Heating cable shealth, braid or ground

Two-pole with 30-mA
ground-fault trip
(208/240 Vac)

Heating
cable
circuit

Fig. 16 HTPG power schematic

230

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Table 10 Power Distribution
Catalog number

Description

Pipe Freeze Protection
and Flow Maintenance

Freezer Frost Heave Prevention Design

Power Distribution and Control Panels
Heat-tracing power distribution panel with ground-fault and monitoring for group
control.

E104

Fire Sprinkler System
Freeze Protection

HTPG

COMMON ALARM
PUSH TO ACKNOWLEDGE
A

POWER ON
C

HAND/OFF/AUTO

Contactors

E304

Example: RaySol and MI heating cables in conduit
Single circuit control

No contactor required

Surface Snow
Melting – ElectroMelt

Step  Complete the Bill of Materials

1. Determine the
freezer configuration

Surface Snow
Melting – MI

Enclosure dimensions: 9-1/2 in x 7-1/5 in x 6-11/16 in (241 mm x 183 mm x 170 mm).

Freezer Frost Heave
Prevention System
Design Steps (in Conduit)

Roof and Gutter
De-Icing

Enclosure dimensions: 13-1/2 in x 9-1/5 in x 6-11/16 in (343 mm x 234 mm x 170 mm).

If you used the Design Worksheet to document all your design parameters, you
should have all the details necessary complete your Bill of Materials.

2. Select the heating
cable
3. Determine
heating cable
conduit spacing
and freezer load

Freezer Frost
Heave Prevention

4. Determine the
heating cable
layout and length
5. Determine the
electrical parameters
6. Select the
connection kits
and accessories
7. Select the control
system

Floor Heating

8. Select the power
distribution
9. Complete the Bill
of Materials

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Freezer Frost Heave Prevention – RaySol and MI Heating Cable System
Design Step by Step MI Heating Cables Directly Embedded
Embedding cables directly in sand (recommended), concrete, or compacted
fill subfloors has the advantage of simpler installation and reduced costs. The
number of electrical circuits can be minimized considerably compared to a similar
installation using conduit. If embedded in a concrete subfloor below the insulation,
the cable must not cross any joints in the subfloor.
Follow these steps to design your system:

 Determine the freezer configuration
 Determine heat loss and freezer load
 Select the heating cable, layout and length
 Determine the heating cable spacing
 Determine the electrical parameters
 Select the accessories
 Select the control system
 Select the power distribution
 Complete the Bill of Materials
The “MI Cables Directly Embedded Freezer Frost Heave Prevention Design
Worksheet” on page 256 is included to help you document the project parameters
that you will need for your project’s Bill of Materials.

232

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Freezer Frost Heave
Prevention System
Design Steps (Embedded)

Step 1 Determine the freezer configuration

1. Determine the
freezer configuration

3. Select the heating
cable, layout and
length
4. Determine the
heating cable spacing
5. Determine the
electrical parameters

7. Select the control
system
8. Select the power
distribution

• Size and layout of freezer or ice arena
• Freezer operating temperature
• Insulation R-value
• Supply voltage and phase
• Control requirements
Prepare scale drawing

Draw to scale the floor area to be heated. Carefully note the limits of the area to be
heated. Show all concrete joints on the drawing and note the location and size of
obstacles, such as floor drains, pipe penetrations, columns, fixtures, and voltage
supply location.

Roof and Gutter
De-Icing

6. Select the
accessories

The following information is required to complete the freezer frost heave prevention
system design.

Fire Sprinkler System
Freeze Protection

2. Determine heat loss
and freezer load

gathering information

Pipe Freeze Protection
and Flow Maintenance

Freezer Frost Heave Prevention Design

9. Complete the Bill
of Materials

Surface Snow
Melting – MI

Side A
20'
(6.1 m)

Fig. 17 Typical freezer example – single-phase
Determine freezer operating temperature

Determine the temperature at which your freezer operates. If it operates at more
than one temperature, or if the operating temperature may be changed in the future,
base the design on the lowest anticipated operating temperature.

Freezer Frost
Heave Prevention

Record insulation R-value

Surface Snow
Melting – ElectroMelt

Side B
40'
(12.2 m)

Floor Heating

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Freezer Frost Heave Prevention – RaySol and MI Heating Cable System
Example: MI heating cables directly embedded – Single-phase
Area

40 ft x 20 ft = 800 ft2
(12.2 m x 6.1 m = 74 m2)

Freezer operating temperature

–30°F (–34°C)

Insulation R-value

R-20 (20 ft2·°F·hr/Btu)

Supply voltage

208 V, single-phase

Example: MI heating cables directly embedded – Three-phase

Freezer Frost Heave
Prevention System
Design Steps (Embedded)
1. Determine the
freezer configuration
2. Determine heat loss
and freezer load
3. Select the heating
cable, layout and
length
4. Determine the
heating cable spacing
5. Determine the
electrical parameters

Area

80 ft x 80 ft = 6400 ft2
(24.4 m x 24.4 m = 595 m2)

Freezer operating temperature

–20°F (–29°C)

Insulation R-value

R-20 (20 ft2·°F·hr/Btu)

Supply voltage

208 V, three-phase

Step 2 Determine heat loss and freezer load
In Table 11, we have calculated the heat loss for directly embedded MI heating cable
systems based on the freezer temperatures and the floor insulation R-values; from
this table, you will select your design power and freezer load. If your calculated
R-value or freezer operating temperature does not match the values in the table, use
the values that give the higher design power.
Within each cell, there are two numbers; design power and freezer load. Freezer
load is the additional cooling load imposed on the cooling system by the freezer frost
heave prevention heating cable. It is the heat transferred through the insulation into
the freezer, expressed in W/ft2 (W/m2) of floor area.

6. Select the
accessories
7. Select the control
system
8. Select the power
distribution
9. Complete the Bill
of Materials

234

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Table 11 MI Heating Cable: Design Power Requirement and Freezer Load based on 40°F (5°C) Control
Floor insulation R-value (ft2·°F·hr/Btu)

Freezer operating
temperature

20°F (–7°C)
10°F (–12°C)
0°F (–18°C)

–20°F (–29°C)
–30°F (–34°C)
–40°F (–40°C)

R-30

R-40

0.5 (5.4)

0.2 (2.2)

0.1 (1.1)

Freezer load

W/ft2 (W/m2)

0.7 (7.5)

0.4 (4.3)

0.3 (3.2)

Design power

W/ft2 (W/m2)

0.6 (6.5)

0.4 (4.3)

0.2 (2.2)

0.1 (1.1)

Freezer load

W/ft2 (W/m2)

0.8 (8.6)

0.5 (5.4)

0.4 (4.3)

0.3 (3.2)

Design power

W/ft2 (W/m2)

0.9 (9.7)

0.6 (6.5)

0.3 (3.2)

0.2 (2.2)

Freezer load

W/ft2 (W/m2)

1.0 (10.8)

0.6 (6.5)

0.4 (4.3)

0.3 (3.2)

Design power

W/ft2 (W/m2)

1.1 (11.8)

0.7 (7.5)

0.5 (5.4)

0.3 (3.2)

Freezer load

W/ft2 (W/m2)

1.3 (14.0)

0.8 (8.6)

0.5 (5.4)

0.4 (4.3)

Design power

W/ft2 (W/m2)

1.4 (15.1)

0.8 (8.6)

0.6 (6.5)

0.4 (4.3)

Freezer load

W/ft2 (W/m2)

1.5 (16.1)

0.8 (8.6)

0.6 (6.5)

0.5 (5.4)

Design power

W/ft2 (W/m2)

1.6 (17.2)

0.9 (9.7)

0.7 (7.5)

0.5 (5.4)

Freezer load

W/ft2 (W/m2)

1.8 (19.4)

1.0 (10.8)

0.7 (7.5)

0.6 (6.5)

Design power

W/ft2 (W/m2)

1.7 (18.3)

1.1 (11.8)

0.8 (8.6)

0.6 (6.5)

Freezer load

W/ft2 (W/m2)

2.0 (21.5)

1.1 (11.8)

0.8 (8.6)

0.6 (6.5)

Design power

W/ft2 (W/m2)

2.0 (21.5)

1.2 (12.9)

0.8 (8.6)

0.7 (7.5)

Freezer load

W/ft2 (W/m2)

2.3 (24.7)

1.2 (12.9)

0.8 (8.6)

0.7 (7.5)

Surface Snow
Melting – MI

Design power

Roof and Gutter
De-Icing

–10°F (–23°C)

R-20

W/ft2 (W/m2)

Fire Sprinkler System
Freeze Protection

30°F (–1°C)

R-10

Pipe Freeze Protection
and Flow Maintenance

Freezer Frost Heave Prevention Design

Example: MI heating cables directly embedded – Single-phase
Freezer operating temperature

–30°F (–34°C) (from Step 1)

Insulation R-value

R-20 (20 ft2·°F·hr/Btu) (from Step 1)

Design power

1.1 W/ft2 (11.8 W/m2)

Freezer load

1.1 W/ft2 (11.8 W/m2)

Freezer operating temperature

–20°F (–29°C) (from Step 1)

Insulation R-value

R-20 (20 ft2·°F·hr/Btu) (from Step 1)

Design power

0.9 W/ft2 (9.7 W/m2)

Freezer load

1.0 W/ft2 (10.8 W/m2)

Surface Snow
Melting – ElectroMelt

Example: MI heating cables directly embedded – Three-phase

Freezer Frost
Heave Prevention
Floor Heating

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Sheets

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Freezer Frost Heave Prevention – RaySol and MI Heating Cable System
Freezer Frost Heave
Prevention System
Design Steps (Embedded)
1. Determine the
freezer configuration
2. Determine heat loss
and freezer load
3. Select the heating
cable, layout and
length
4. Determine the
heating cable spacing
5. Determine the
electrical parameters
6. Select the
accessories
7. Select the control
system
8. Select the power
distribution
9. Complete the Bill
of Materials

Step 3 Select the heating cable, layout and length
To select the correct MI heating cable for the heated area, you must determine the
wattage required for the area or subsection area.
For small freezers, one heating cable may be sufficient. For large freezers, it may be
necessary to divide the freezer into two or more equal subsection areas. To balance
the load in a three-phase circuit, three cables will be required, or a multiple of three
cables when more than one three-phase circuit is required. If the heating cables are
to be embedded in a concrete subfloor, divide the area so that the heating cables will
not cross any joints in the subfloor.
The heating cables shown in Table 12 are general purpose cables and may be used
for a variety of applications depending on the supply voltage; the heating cables in
Table 13 have been optimized for frost heave prevention applications. If assistance
is required to select heating cables for irregular shaped areas or applications
outside the scope of this design guide, contact your Pentair Thermal Management
representative for assistance in designing a custom heating cable.
Single-phase supply

Small freezer areas require only one heating cable. Large freezer areas may require
two or more heating cables.
• Divide large freezer areas into equal subsection areas, if possible.
• Calculate the power required for the total area (small freezers) or for each subsection area (large freezers) by multiplying the design power
(from Table 11) by the total area or subsection area.
Power required = Design power x Total area (or Subsection area)
Simply select the heating cable from Table 12 or Table 13 based on the total area
or subsection area. Under the appropriate voltage, make sure that the total area
or subsection area falls within the minimum and maximum range of the “Area
coverage” columns and verify that the “Cable wattage” shown directly across from
the “Area coverage” is equal to or higher than the calculated “Power required” for
the total area or subsection area (see example following).
Note: If two or more cables in the Tables meet the requirements, use the cable
with the lower wattage.

236

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In cases where the freezer area has been divided into equal subsections, select the
appropriate number of heating cables. Where heating cables are directly embedded
in concrete subfloors, calculate the wattage required for each area bounded by joints
in the subfloor and select an appropriate cable for each area.

Fire Sprinkler System
Freeze Protection

1Ø Supply

Pipe Freeze Protection
and Flow Maintenance

Freezer Frost Heave Prevention Design

Junction box

20'
(6.1 m)

Roof and Gutter
De-Icing

40'
(12.2 m)

Fig. 18 Single-phase layout
Surface Snow
Melting – MI

Example: MI heating cables directly embedded – Single-phase
800 ft2 (74 m2) (See Fig. 18)

Design power

1.1 W/ft2 (11.8 W/m2) (from Step 2)

Power required

Design power x Area = 1.1 W/ft2 x 800 ft2 = 880 W
(11.8 W/m2 x 74 m2 = 880 W)

Supply voltage

208 V, single-phase (from Step 1)

Catalog number

SUB19

Cable wattage

885 W

Heated length

245 ft (74.7 m)

Quantity

Surface Snow
Melting – ElectroMelt

Area

Freezer Frost
Heave Prevention
Floor Heating

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Sheets

THERMAL MANAGEMENT SOLUTIONS

Freezer Frost Heave Prevention – RaySol and MI Heating Cable System
Three-phase supply

Designing the frost heave prevention system using a three-phase voltage supply has
the added advantages of fewer circuits, reduced distribution costs, and a balanced
heating system load and is recommended for large freezers.
Three-phase voltages include 208/120 V, 480/277 V, and 600/347 V. When selecting
heating cables for three-phase voltages, cable layout will be easier if the heating
cables are wye connected (Fig. 19); therefore select the cables based on the phaseto-neutral voltage (e.g., select 277 V cables for a 480 V supply).
80'
(24.4 m)

80'
(24.4 m)

Junction
box
3ø
supply

To temperature controller

Junction
box

Fig. 19 Three-phase wye connected heating cable layout

Since a balanced three-phase system requires three cables, each cable will occupy
1/3 of the freezer area when installed.
• Calculate the “Power required” by multiplying the design power from Table 11 by
the total freezer area.
• Divide the total freezer area by three to determine the “Area coverage for each
cable.”
• Calculate the "Wattage for each cable" by dividing the “Power required” by three.
Wattage for each cable = (Design power x Total freezer area) / 3
Simply select the heating cable from Table 12 on page 240 or Table 13 on page 241
based on the area coverage for each cable. Under the appropriate voltage, make
sure that the area coverage for each cable falls within the minimum and maximum
range of the “Area coverage” columns and verify that the “Cable wattage” shown
directly across from the “Area coverage” is equal to or higher than the calculated
“Wattage for each cable” (see example following). Three of the same cables are
required for balanced three-phase systems.
Note: If two or more cables in the Tables meet the requirements, use the cable
with the lower wattage.
Note: For very large freezers, it may be necessary to divide the freezer into
subsections and use two or more three-phase circuits.

238

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Example: MI heating cables directly embedded – Three-phase
Design power

0.9 W/ft2 (9.7 W/m2) (from Step 2)

Power required

(Design Power x Area) =
(0.9 W/ft2 x 6400 ft2) = 5760 W
(9.7 W/m2 x 595 m2) = 5760 W

Area coverage for each cable

Area/3 = 6400 ft2/3 = 2133 ft2
(595 m2/3 = 198.3 m2)

Wattage for each cable

Power required/3 = 5760/3 = 1920 W

Supply voltage

208 V, three-phase (from Step 1)
(select 120 volt cable for wye connection)

Catalog number

SUB8

Cable wattage

2300 W

Cable voltage

120 V

Heated length

550 ft (167.6 m)

Quantity

Roof and Gutter
De-Icing

6400 ft2 (595 m2) (see Fig. 19)

Fire Sprinkler System
Freeze Protection

Area

Pipe Freeze Protection
and Flow Maintenance

Freezer Frost Heave Prevention Design

Surface Snow
Melting – MI
Surface Snow
Melting – ElectroMelt
Freezer Frost
Heave Prevention
Floor Heating

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Sheets

THERMAL MANAGEMENT SOLUTIONS

Freezer Frost Heave Prevention – RaySol and MI Heating Cable System
Table 12 Selection Table for MI Heating Cables for Directly Embedded Cables
Area coverage
Catalog
number

Min
(ft2)

Max
(ft2)

Min
(m2)

Max
(m2)

Cable
wattage
(W)

Heated length 1
(ft)

(m)

Heating cable current
(A)2

120 V and 208 V, three-phase wye
SUA3

205

700

19.1

65.1

500

140

42.7

4.2

SUA4

220

340

20.4

31.6

550

20.7

4.6

SUA7

300

480

27.9

44.6

750

29.0

6.3

SUA8

310

885

28.8

82.2

800

177

53.9

6.7

SUB1

420

660

39.0

61.3

1000

132

40.2

8.3

SUB2

400

1200

37.2

111.5

1000

240

73.1

8.3

SUB3

520

1400

48.3

130.1

1300

280

85.3

10.8

SUB4

600

1600

55.8

148.7

1500

320

97.5

12.5

SUB5

750

1300

69.7

120.8

1800

260

79.2

15.0

SUB6

780

1875

72.5

174.3

1900

375

114.3

15.8

SUB7

940

1550

87.4

144.1

2300

310

94.5

19.2

SUB8

930

2750

86.4

255.6

2300

550

167.6

19.2

SUB9

1250

3150

116.2

292.8

3000

630

192.0

25.0

SUB10

1700

3585

158.0

333.2

4300

717

218.5

35.8

208 V
SUA1

260

540

24.2

50.2

650

108

32.9

3.1

SUA6

650

1320

60.4

122.7

1560

264

80.5

7.5

SUB19

350

1225

32.5

113.8

885

245

74.7

4.3

SUB20

480

1700

44.6

158.0

1210

340

103.6

5.8

SUB21

650

2200

60.4

204.5

1640

440

134.1

7.9

SUB22

820

2625

76.2

244.0

2060

525

160.0

9.9

350

1225

32.5

113.8

1175

245

74.7

4.9

240 V
SUB19
SUB20

480

1700

44.6

158.0

1615

340

103.6

6.7

SUB21

650

2200

60.4

204.5

2180

440

134.1

9.1

SUB22

820

2625

76.2

244.0

2745

525

160.0

11.4

277 V and 480 V, three-phase wye
SUB19

400

1225

37.2

113.8

1565

245

74.7

5.6

SUB20

550

1700

51.1

158.0

2150

340

103.6

7.8

SUB21

720

2200

66.9

204.5

2900

440

134.1

10.5

SUB22

940

2625

87.4

244.0

3650

525

160.0

13.2

347 V and 600 V, three-phase wye
SUB11

540

1125

50.2

104.6

1400

225

68.6

4.0

SUB12

770

1550

71.6

144.1

1950

310

94.5

5.6

SUB13

1060

2140

98.5

198.9

2700

428

130.5

7.8

SUB14

1440

2740

133.8

254.6

3700

548

167.0

10.7

1 Tolerance on heating cable length is –0% to +3%
2 Single-phase current shown
Note: Type SUA cables supplied with 7 ft (2.1 m) long cold lead; type SUB cables supplied with 15 ft (4.6 m) long cold leads.

240

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Table 13 Selection Table for MI Heating Cables for Directly Embedded Cables
Area coverage
Min
(ft2)

Max
(ft2)

Min
(m2)

Max
(m2)

(ft)

(m)

Heating cable current
(A)2

120 V and 208 V, three-phase Wye
290

15.1

27.0

405

17.7

3.4

205

360

19.1

33.5

510

22.0

4.3

FFHP3

231

415

21.5

38.6

580

25.3

4.8

FFHP4

282

510

26.2

47.4

705

102

31.1

5.9

FFHP5

328

585

30.5

54.4

820

117

35.7

6.8

FFHP6

392

700

36.4

65.1

980

140

42.7

8.2

FFHP7

450

800

41.8

74.3

1125

160

48.8

9.4

FFHP8

519

925

48.2

86.0

1300

185

56.4

10.8

FFHP9

637

1130

59.2

105.0

1590

226

68.9

13.3

FFHP10

733

1310

68.1

121.7

1830

262

79.9

15.3

FFHP11

900

1600

83.6

148.7

2250

320

97.6

18.8

FFHP12

1186

2130

110.2

198.0

2965

426

129.9

24.7

FFHP13

1470

2640

136.6

245.4

3675

528

161.0

30.6

FFHP14

1862

3320

173.0

308.6

4650

664

202.4

38.8

FFHP15

281

505

26.1

46.9

700

101

30.8

3.4

FFHP16

352

630

32.7

58.6

880

126

38.4

4.2

FFHP17

401

720

37.2

66.9

1000

144

43.9

4.8

FFHP18

492

880

45.7

81.8

1230

176

53.7

5.9

FFHP19

568

1015

52.8

94.3

1420

203

61.9

6.8

FFHP20

678

1215

63.0

112.9

1700

243

74.1

8.2

FFHP21

778

1390

72.3

129.2

1945

278

84.8

9.4

FFHP22

901

1600

83.8

148.7

2250

320

97.6

10.8

FFHP23

1098

1970

102.1

183.1

2745

394

120.1

13.2

FFHP24

1268

2275

117.8

211.4

3170

455

138.7

15.2

FFHP25

1553

2785

144.4

258.8

3885

557

169.8

18.7

FFHP26

326

580

30.3

53.9

815

116

35.4

3.4

FFHP27

407

725

37.9

67.4

1020

145

44.2

4.3

FFHP28

463

830

43.0

77.1

1160

166

50.6

4.8

FFHP29

567

1015

52.7

94.3

1420

203

61.9

5.9

FFHP30

656

1170

61.0

108.7

1640

234

71.3

6.8

FFHP31

786

1395

73.1

129.6

1965

279

85.1

8.2

FFHP32

900

1600

83.6

148.7

2250

320

97.6

9.4

FFHP33

1038

1850

96.5

171.9

2600

370

112.8

10.8

FFHP34

1274

2260

118.4

210.0

3185

452

137.8

13.3

FFHP35

1471

2610

136.7

242.6

3680

522

159.1

15.3

FFHP36

1800

3200

167.3

297.4

4500

640

195.1

18.8

Surface Snow
Melting – MI

163

FFHP2

Roof and Gutter
De-Icing

FFHP1

208 V

Surface Snow
Melting – ElectroMelt

240 V

Freezer Frost
Heave Prevention
Floor Heating

1 Tolerance on heating cable length is –0% to +3%.
2 Single-phase current shown
Note: Type FFHP cables supplied with 15 ft (4.6 m) long cold leads.

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Fire Sprinkler System
Freeze Protection

Catalog
number

Heated length 1

Cable
wattage
(W)

Pipe Freeze Protection
and Flow Maintenance

Freezer Frost Heave Prevention Design

Freezer Frost Heave Prevention – RaySol and MI Heating Cable System
Table 13 Selection Table for MI Heating Cables for Directly Embedded Cables
Area coverage
Catalog
number

Min
(ft2)

Max
(ft2)

Min
(m2)

Max
(m2)

Cable
wattage
(W)

Heated length 1
(ft)

(m)

Heating cable current
(A)2

277 V and 480 V, three-phase wye
FFHP37

375

670

34.9

62.3

940

134

40.9

3.4

FFHP38

468

840

43.5

78.1

1170

168

51.2

4.2

FFHP39

536

955

49.8

88.8

1340

191

58.2

4.8

FFHP40

656

1170

60.9

108.7

1640

234

71.3

5.9

FFHP41

758

1350

70.4

125.5

1895

270

82.3

6.8

FFHP42

908

1610

84.4

149.6

2270

322

98.2

8.2

FFHP43

1037

1850

96.4

171.9

2590

370

112.8

9.4

FFHP44

1201

2130

111.6

198.0

3000

426

129.9

10.8

FFHP45

1462

2625

135.8

244.0

3655

525

160.1

13.2

FFHP46

1697

3015

157.7

280.2

4240

603

183.8

15.3

FFHP47

2074

3700

192.7

343.9

5185

740

225.6

18.7

347 V and 600 V, three-phase wye
FFHP48

470

840

43.7

78.1

1175

168

51.2

3.4

FFHP49

588

1050

54.7

97.6

1470

210

64.0

4.2

FFHP50

672

1195

62.4

111.1

1680

239

72.9

4.8

FFHP51

819

1470

76.1

136.6

2050

294

89.6

5.9

FFHP52

950

1690

88.3

157.1

2375

338

103.0

6.8

FFHP53

1133

2025

105.3

188.2

2830

405

123.5

8.2

FFHP54

1295

2325

120.3

216.1

3240

465

141.8

9.3

FFHP55

1500

2675

139.4

248.6

3750

535

163.1

10.8

FFHP56

1838

3275

170.8

304.4

4600

655

199.7

13.3

FFHP57

2126

3775

197.6

350.8

5315

755

230.2

15.3

1 Tolerance on heating cable length is –0% to +3%.
2 Single-phase current shown
Note: Type FFHP cables supplied with 15 ft (4.6 m) long cold leads.

242

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Freezer Frost Heave
Prevention System
Design Steps (Embedded)

Step 4 Determine the heating cable spacing
To determine the spacing between runs of heating cables, use the formula below:

1. Determine the
freezer configuration

Area (ft2) x 12 in

Fire Sprinkler System
Freeze Protection

Cable spacing (in) =

2. Determine heat loss
and freezer load

Heated length (ft)

3. Select the heating
cable, layout and
length

Cable spacing (cm) =

4. Determine the
heating cable spacing

Area (m2) x 100 cm
Heated length (m)

5. Determine the
electrical parameters

7. Select the control
system

Example: MI heating cables directly embedded – Single-phase

8. Select the power
distribution
9. Complete the Bill
of Materials

800 ft2 (74 m2) (from Step 3)

Catalog number

SUB19 (from Step 3)

Heated length

245 ft (74.7 m) (from Step 3)

Cable spacing

800 ft2 x 12 / 245 ft = 39.2 in
rounded to 39 in

74 m2 x 100 / 74.7 m = 99.1 cm
rounded to 99 cm

Surface Snow
Melting – MI

Area

Roof and Gutter
De-Icing

Note: If a large area has been divided into subsections or if a three-phase
voltage supply is used, the “Area” in the above equations will be the subsection area
or area coverage for each cable and the “Heated length” will be the length of the
selected cable.

6. Select the
accessories

Pipe Freeze Protection
and Flow Maintenance

Freezer Frost Heave Prevention Design

Example: MI heating cables directly embedded – Three-phase
Area coverage for each cable 2133 ft2 (198.3 m2) (from Step 3)
SUB8 (from Step 3)

Heated length

550 ft (167.6 m) (from Step 3)

Cable spacing

2133 ft2 x 12 / 550 ft = 46.5 in
rounded to 47 in

198.3 m2 x 100 / 167.6 m = 118.3 cm
rounded to 118 cm

Surface Snow
Melting – ElectroMelt

Freezer Frost Heave
Prevention System
Design Steps (Embedded)

Catalog number

Step 5 Determine the electrical parameters

2. Determine heat loss
and freezer load
3. Select the heating
cable, layout and
length
4. Determine the
heating cable spacing

6. Select the
accessories
7. Select the control
system
8. Select the power
distribution
9. Complete the Bill
of Materials

For three-phase circuits used in frost heave protection systems, the three heating
cables are generally connected in the wye configuration shown in Fig. 21 on
page 248. For a wye connected three-phase circuit, the current draw is the same
as the single-phase heating cable current and must not exceed 80% of the 3-pole
circuit breaker rating.
A 30-mA ground-fault protection device (GFPD) must be used to provide protection
from arcing or fire, and to comply with warranty requirements, agency certifications,
and national electrical codes. If the heating cable is improperly installed, or
physically damaged, sustained arcing or fire could result. If arcing does occur, the
fault current may be too low to trip conventional circuit breakers.

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

For single-phase circuits, when connecting individual heating cables to circuit
breakers, the cable current draw must not exceed 80% of the circuit breaker rating.
To reduce the number of circuits, multiple heating cables may be connected in
parallel. When multiple cables are connected in parallel, the total of the individual
heating cable currents must not exceed 80% of the circuit breaker rating. The singlephase heating cable current is shown in Table 12 and Table 13.

Floor Heating

5. Determine the
electrical parameters

Determine number of circuits

Freezer Frost
Heave Prevention

1. Determine the
freezer configuration

Freezer Frost Heave Prevention – RaySol and MI Heating Cable System
WARNING: To minimize the danger of fire from sustained electrical arcing if
the heating cable is damaged or improperly installed, and to comply with the
requirements of Pentair Thermal Management, agency certifications, and national
electrical codes, ground-fault equipment protection must be used on each heating
cable branch circuit. Arcing may not be stopped by conventional circuit protection.
Select branch circuit breaker size

Record the number and ratings of the circuit breakers to be used. Use ground-fault
protection devices (GFPDs) for all applications. For three-phase circuits, ground fault
may be accomplished using a shunt trip 3-pole breaker and a ground fault sensor.
dETERMINE transformer load

The total transformer load is the sum of the wattages of the selected heating cables.
Calculate the Total Transformer Load as follows:
Transformer load (kW) =

Cable1 (W) + Cable2 (W) + Cable3 (W)... + CableN (W)
1000

Example: MI heating cables directly embedded – Single-phase
Amps

4.3 A (from Table 12)

Circuit breaker size

15 A breaker, 80% loading 12 A

Number of circuit breakers

Cable power output

885 W (from Step 3)

Number of cables

1 (from Step 3)

Transformer load

885 W / 1000 = 0.9 kW

Example: MI heating cables directly embedded – Three-phase
Amps/cable

19.2 A (from Table 12)

Circuit breaker size

25 A, 3-pole breaker, 80% loading 20 A

Number of circuit breakers

1 (3 cables wye connected – see Fig. 21)

Cable power output

2300 W (from Step 3)

Number of cables

3 (from Step 3)

Total Transformer load

(2300 W x 3) / 1000 = 6.9 kW

Record the number and ratings of the circuit breakers to be used and total
transformer load on the worksheet.

244

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THERMAL MANAGEMENT SOLUTIONS

Freezer Frost Heave
Prevention System
Design Steps (Embedded)

Step 6 Select the accessories
For your embedded system, determine the number of junction boxes required.

1. Determine the
freezer configuration

Select a UL Listed and/or CSA Certified junction box that is suitable for the location,
such as the Pyrotenax D1297TERM4. Use a box with minimum internal volume of 16
cubic inches if the box is metallic and 19 cubic inches if the box is not metallic. Metal
junction boxes are recommended.

3. Select the heating
cable, layout and
length
4. Determine the
heating cable spacing

Note: The junction box must be accessible according to the national electrical
codes.

5. Determine the
electrical parameters

After determining the number of heating cables required, the number of circuits, and
the junction box locations, do a trial layout. In making the trial layout, follow these
recommendations:

7. Select the control
system
8. Select the power
distribution

• Install the heating cables in a sand layer beneath the insulation.

9. Complete the Bill
of Materials

• When directly embedded in the concrete floor, do not cross expansion joints in the
floor.

• Maintain the design spacing within 4 in (10 cm).

Surface Snow
Melting – MI

• Do not route the cables closer than 4 in (10 cm) to the edge of the subfloor,
drains, anchors, or other material.
Table 14 Accessories
Catalog
number
D1297TERM4

Standard
packaging

Description

Usage
For MI cable only

Surface Snow
Melting – ElectroMelt

1
A cast aluminum junction box (Type 3) for installation
in nonhazardous and CID2 locations. Three 1/2-in NPT
entries on bottom, provided with plugs. Includes 4-pole
terminal block (CSA - 600 V, 65 A, 18 - 6 AWG; UL - 300
V, 65 A, 18 - 6 AWG). External mounting feet. CSA approved for Class I, Div. 2, Groups A, B, C, and D. (for MI
only)
Enclosure dimensions: 6 in x 6 in x 4 in
(150 mm x 150 mm x 100 mm).

Example: MI heating cables directly embedded – Single-phase
D1297TERM4

Quantity required

Freezer Frost
Heave Prevention

Junction box

Example: MI heating cables directly embedded – Three-phase
Junction box

Contractor supplied

Quantity required

Roof and Gutter
De-Icing

6. Select the
accessories

Fire Sprinkler System
Freeze Protection

Select Junction Box

2. Determine heat loss
and freezer load

Pipe Freeze Protection
and Flow Maintenance

Freezer Frost Heave Prevention Design

Floor Heating

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Freezer Frost Heave Prevention – RaySol and MI Heating Cable System
Freezer Frost Heave
Prevention System
Design Steps (Embedded)

Step 7 Select the control system
For MI cable, a temperature controller must be used to maintain the subfloor
temperature at 40°F (4°C). For installations where temperature control and
temperature monitoring is desired, a Pentair Thermal Management DigiTrace C910485 or DigiTrace ACS-30 controller is recommended. For additional information on
temperature controller options, refer to Table 8 on page 227.

1. Determine the
freezer configuration
2. Determine heat loss
and freezer load
3. Select the heating
cable, layout and
length
4. Determine the
heating cable spacing
5. Determine the
electrical parameters
6. Select the
accessories
7. Select the control
system
8. Select the power
distribution
9. Complete the Bill
of Materials

Table 15 Control Systems
Catalog number

Description

Electronic thermostats and accessories
ECW-GF

Electronic ambient sensing controller with 30-mA ground-fault protection. The controller can be programmed to maintain temperatures up to 200°F (93°C) at voltages from
100 to 277 V and can switch current up to 30 Amperes. The ECW-GF is complete with
a 25-ft (7.6-m) temperature sensor and is housed in a Type 4X rated enclosure. The
controller features an AC/DC dry alarm contact relay.
An optional ground-fault display panel (ECW-GF-DP) can be added to provide groundfault or alarm indication in applications where the controller is mounted in inaccessible
locations.

ECW-GF-DP

MI-GROUND-KIT

An optional remote display panel (ECW-GF-DP) that can be added to provide groundfault or alarm indication in applications where the controller is mounted in inaccessible locations.

Grounding kit for nonmetallic enclosures (for MI only)

Electronic controllers and sensors
C910-485

246

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Table 15 Control Systems
Description

ACS-UIT2
ACS-PCM2-5

The DigiTrace ACS-30 Advanced Commercial Control System is a multipoint electronic
control and monitoring system for heat-tracing used in various commercial applications such as pipe freeze protection, roof and gutter de-icing, surface snow melting, hot
water temperature maintenance and floor heating. The DigiTrace ACS-30 system can
control up to 260 circuits with multiple networked ACS-PCM2-5 panels, with a single
ACS-UIT2 user interface terminal. The ACS-PCM2-5 panel can directly control up to 5
individual heat-tracing circuits using electromechanical relays rated at 30 A up to
277 V.

ProtoNode-LER
ProtoNode-RER

The DigiTrace ProtoNode is an external, high performance multi-protocol gateway for
customers needing protocol translation between Building Management Systems (BMS)
and the DigiTrace ACS-30 or C910-485 controllers.

PROTOCESSOR
SERIAL ETHERNET

By FieldServer Technologies
www.ProtoCessor.com

RS 485 GND
RS 485 RS 485+

The ProtoNode-LER is for LonWorks® systems; and the ProtoNode-RER is for
BACnet® or Metasys® N2 systems.

+PWR
- PWR
FRAME GND

RTD10CS
RTD-200
RTD50CS

Stainless steel jacketed three-wire RTD (Resistance Temperature Detector) used with
DigiTrace C910-485 and ACS-30 controllers.

Example: MI heating cables directly embedded – Single-phase

Surface Snow
Melting – MI

RTD10CS: 10-ft (3 m) flexible armor, with 18-in (457 mm) lead wire and 1/2-inch NPT
bushing
RTD-200: 6-ft (1.8 m) fluoropolymer with 1/2-in NPT bushing
RTD50CS: 50-ft (3 m) flexible armor with 1/2-in NPT bushing

Roof and Gutter
De-Icing

PROTONODE

B0
B1
B2
B3
S0
S1
S2
S3

Fire Sprinkler System
Freeze Protection

A0
A1
A2
A3
A4
A5
A6
A7

Catalog number

Pipe Freeze Protection
and Flow Maintenance

Freezer Frost Heave Prevention Design

Single circuit, electronic controller DigiTrace C910-485
Quantity

Example: MI heating cables directly embedded – Three-phase
Quantity

*Use ACS-30 General part number (P000001232) for custom three-phase panels. Please
contact your Pentair Thermal Management representative for a custom ACS-PCM2-5
panel quotation.
Freezer Frost Heave
Prevention System
Design Steps (Embedded)

Step 8 Select the power distribution

2. Determine heat loss
and freezer load
3. Select the heating
cable, layout and
length
4. Determine the
heating cable spacing

6. Select the
accessories
7. Select the control
system
8. Select the power
distribution
9. Complete the Bill
of Materials

2. Through external contactors activated by a temperature controller
3. Through an HTPG power distribution panel
Single circuit control

Heating cable circuits that do not exceed the current rating of the selected controller
can be switched directly (Fig. 20). When the total electrical load exceeds the rating
of the controller or if a single-pole temperature controller is used to control a threephase circuit (Fig. 21), an external contactor is required.
Group control

If the temperature controller will activate multiple single-phase or three-phase
circuits (group control), then an external contactor must be used. In Fig. 20, three
single-phase circuits are activated by a temperature controller through an external
contactor.

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

1. Directly through the temperature controller

Floor Heating

5. Determine the
electrical parameters

Power to the heating cables can be provided in three ways:

Freezer Frost
Heave Prevention

1. Determine the
freezer configuration

Surface Snow
Melting – ElectroMelt

Single circuit, monitoring requested DigiTrace ACS-30*

Freezer Frost Heave Prevention – RaySol and MI Heating Cable System
Single circuit control

Group control
Temperature
controller

Heating
cable
Temperature
controller

1 ø supply
N

1-pole
GFEP breaker

ø supply
N

ø
ø
ø

Heating cable
sheath, braid
or ground

3-phase 4-wire
supply (WYE)

Contactor

3-pole main
breaker
N
G

Heating cable
sheath, braid
or ground

Fig. 20 Single circuit and group control

Ground A

Three-phase
4-wire supply
B

C
MCB

3-pole contactor
120 volt coil

to
120 V

Temperature
controller

3-pole circuit
breaker with shunt
trip/external groundfault sensor

To ground
fault module

Ground fault
sensor
B
Heating cable
sheath, braid
or ground

Note: Heating cable voltage is the same
as the phase-to-neutral voltage (VØ-N / 3 )
Note: For Wye connected heating
cables, the current in the supply feeder,
contactor, and breakers is equal to the
C ‘Single Phase Heating Cable Current.’

Fig. 21 Typical three-phase wye connected cables with temperature controller and
contactor

248

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Alarm horn (optional)
Door
disconnect
(optional)

Main circuit
breaker

R AR

Alarm relay
(optional)

COMMON ALARM
PUSH TO ACKNOWLEDGE

Selector switch

TB 1

Distribution
panelboard

Main
contactor

Fuse holder

Roof and Gutter
De-Icing

Push button for
light testing

Fire Sprinkler System
Freeze Protection

Large systems with many circuits should use an HTPG power distribution panel. The
HTPG is a dedicated power-distribution, control, ground-fault protection, monitoring,
and alarm panel for freeze protection and broad temperature-maintenance
heat-tracing applications. This enclosure contains an assembled circuit-breaker
panelboard. Panels are equipped with ground-fault circuit breakers with or
without alarm contacts. The group control package allows the system to operate
automatically in conjunction with a temperature control system.

Pipe Freeze Protection
and Flow Maintenance

Freezer Frost Heave Prevention Design

POWER ON
C

Terminals
(optional)

HAND/OFF/AUTO

Surface Snow
Melting – MI

Ground
bus bar

TB 2

Alarm option shown above

Fig. 22 HTPG power distribution panel
Surface Snow
Melting – ElectroMelt

Three-phase, 4 wire supply (Wye)

Ø1 Ø2Ø3 N G
Three-pole main
circuit breaker

Off

Contactor
coil

Auto

External controller/
thermostat*

Panel
energized

One-pole with 30-mA
ground-fault trip
(120/277 Vac)

Alarm
remote
annunciation
(with alarm
option)

Power
connection
Heating cable

Freezer Frost
Heave Prevention

Three-pole main
contactor

Hand

End seal
Heating
cable
circuit
Heating cable shealth, braid or ground

Two-pole with 30-mA
ground-fault trip
(208/240 Vac)

Floor Heating

Heating
cable
circuit

Fig. 23 Typical HTPG power schematic

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Freezer Frost Heave Prevention – RaySol and MI Heating Cable System
Table 16 Power Distribution
Catalog number

Description

Power distribution and control panels
HTPG

Heat-tracing power distribution panel with ground-fault and monitoring for group control.

E104

COMMON ALARM
PUSH TO ACKNOWLEDGE
A

POWER ON
C

HAND/OFF/AUTO

Contactors

Enclosure dimensions: 13-1/2 in x 9-1/5 in x 6-11/16 in (343 mm x 234 mm x 170 mm).
E304

Freezer Frost Heave
Prevention System
Design Steps (Embedded)
1. Determine the freezer
configuration

Step 9 Complete the Bill of Materials
If you used the Design Worksheet to document all your design parameters, you
should have all the details necessary complete your Bill of Materials.

2. Determine heat loss
and freezer load
3. Select the heating
cable, layout and
length
4. Determine the heating
cable spacing
5. Determine the
electrical parameters
6. Select the
accessories
7. Select the control
system
8. Select the power
distribution system
9. Complete the Bill
of Materials

250

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THERMAL MANAGEMENT SOLUTIONS

RaySol and MI Heating Cable in Conduit Freezer Frost Heave Prevention Design Worksheet
Step  Determine the freezer configuration (RaySol and MI heating cable systems)

Side A (length)
(ft/m)

Side B (width)
(ft/m)

Freezer area
(ft2/m2)

Record insulation
R-value

Supply voltage

______________°F/°C

_____________
ft2·°F·hr/Btu

______________ Volts

Example: RaySol and MI heating cables
80 ft

40 ft
Side B (width) (ft)

3200 ft2
Freezer area (ft2)

–20°F

R-40 (40 ft2·°F·hr/Btu)

208 Volts

Roof and Gutter
De-Icing

Side A (length) (ft)

Fire Sprinkler System
Freeze Protection

Determine freezer area (from scale drawing)

Determine freezer
operating
temperature

Pipe Freeze Protection
and Flow Maintenance

RaySol and MI Heating Cable in Conduit Freezer Frost Heave Prevention Design Worksheet

Step  Select the heating cable
MI heating cable

Supply voltage

❑ 120 V

❑ 208 V

❑ 240 V

❑ 277 V

Freezer side A length (ft/m): ____________________

Catalog number: ____________________

Catalog number:

____________________

Power output (W):

____________________

Surface Snow
Melting – MI

RaySol heating cable

Example: RaySol heating cable
Supply voltage

Supply voltage

0 208 V

Catalog number: RaySol-2

Freezer side A length: 80 ft
FFHPC30

Power output:

475 W

Surface Snow
Melting – ElectroMelt

Catalog number:

Step  Determine the heating cable conduit spacing and freezer load (RaySol and MI heating cable systems)
Based on the insulation R-value and freezer operating temperature you recorded in Step 1, use Table 4 to select the following:
Freezer load (W/ft2) (W/m2) ___________________________

Example: For RaySol and MI heating cables
Conduit spacing: 96 in

Freezer load: 0.5 W/ft2

Freezer Frost
Heave Prevention

Conduit spacing (in/cm) ___________________________

Floor Heating

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Freezer Frost Heave Prevention – RaySol and MI Heating Cable System
Step  Determine the heating cable layout and length
RaySol heating cable in conduit

MI heating cable in conduit

1. Estimate the number of conduit runs
Imperial

(((
Side B (ft)

Side B
B (ft)
(ft)
Side

xxx 12
12)))///
12

(

Conduit
Conduitspacing
spacing(in)
(in)
Conduit
spacing
(in)

===

Estimated
Estimatednumber
number
Estimated
number
of
ofconduit
conduitruns
runs
of
conduit
runs

(

Metric

(((
Side B (m)

xxx 100
===
100)))///
100
Conduit
Estimatednumber
number
Conduitspacing
spacing(cm)
(cm) Estimated
Conduit
spacing
(cm)
Estimated
number
of
ofconduit
conduitruns
runs
of
conduit
runs
If necessary, round to the next whole number
Side B
B (m)
(m)
Side

Example: RaySol heating cable
40
40ftft

((( 40 ft
Side B (ft)

Side B
B (ft)
(ft)
Side

xxx 12
12)))///
12

96
96in
in
96
in
Conduit
Conduitspacing
spacing(in)
(in)
Conduit
spacing
(in)

===

555

(

Estimated
Estimatednumber
number
Estimated
number
of
ofconduit
conduitruns
runs
of
conduit
runs

2. Estimate the heating cable length required for conduit runs
x
=
Side A (ft/m) x
Number of =
Heating cable
Number
of
Side A (ft/m)
Heating
cable(ft/m)
conduit runs
length
required
conduit runs
length required (ft/m)

(

1. Estimate
) / number of conduit runs
=
x 12the
Side BImperial
(ft)
Conduit spacing (in) Estimated number
of conduit runs
x 12
( ((
x 12
) / )) //
= ==
x
12
Side
B (ft)
Conduit
spacing
(in) Estimated
Estimated
number
Side
B (ft)
Conduit
spacing
(in)(in)
number
Estimated
number
Side
B (ft)
Conduit
spacing
of
conduit
runs
of of
conduit
runs
conduit runs
x 100) /
=
Side BMetric
(m)
Conduit spacing (cm) Estimated number
of conduit runs
x 100
( ((
x 100
) / )) //
= ==
x
100
Side
B (m)
number
Conduit
spacing
(cm) Estimated
Side
B (m)
Conduit
spacing
(cm)
number
Side
B (m)
Conduit
spacing
(cm) Estimated
Estimated
number
of
conduit
runs
of of
conduit
runs
conduit
runs
If necessary, round to the next whole number
5
5
=
Example: MI heating cable
Number of conduit runs Number of heating cables required
96
in =
5
4040
ft xft 12 ) /
9696
in in
5 5
x Conduit
12
)
/ spacing
=
( ((B (ft)40 ft x 12
)
/
=
Side
(in)
Estimated
number
/ Conduit spacing (in) = Estimated number
Side
B (ft) x 12 ) Conduit
Side
B (ft)
number
spacing
(in)(in)
of Estimated
conduit
runs
Side
B (ft)
Conduit
spacing
Estimated
number
of
conduit
runs
of of
conduit
runs
conduit
runs
2. Determine the number of MI heating cables
x 100) /
=
Side B (m)
Conduit spacing
(cm) Estimated number
=
Number of conduit runs Number of heating
cables required
of conduit
runs

Example: RaySol heating cable
80 ft
80 ft
Side A (ft)
Side A (ft)

x
x

Example: MI heating cable

5
400 ft
=
5
400 ft
Heating cable
Number of =
Number
of
Heating
cable (ft)
length
required
conduit runs
conduit runs
length required (ft)

5
Number of conduit runs

5
Number of heating cables required

3. Determine the maximum circuit length (see Table 5)
Heating cable Supply voltage
length required
(V)
(ft/m)

Maximum circuit length
(ft/m)

Is the heating cable length required > the maximum circuit length?
❑ No –400
Oneft circuit is sufficient
208 V
410 ft
❑ Yes – Multiple circuits are required
Heating
Maximum
Heatingcable
cable Supply
Supply voltage
voltage
Maximum circuit
circuit length
length
length
required
(ft)
(V)
(ft)
length
required
(V)
(ft/m)
Number of circuits
Power supply
(ft/m)

Number of conduit runs

Number of heating cables required

Example: RaySol heating cable
400 ft
208 V
410 ft
1
One 20 A circuit breaker
Heating cable Supply voltage
Maximum circuit length
Number
of circuits
Power supply
length
required
(ft)
(V)
(ft)
Number
of circuits
Power supply
Is the heating cable length required > the maximum circuit length?
0 No – One circuit is sufficient
1
One 20 A circuit breaker
Number of circuits

Power supply

4. Determine layout
Is Side A x 2 ≤ to the maximum circuit length?
❑ Yes – Conduit can be looped in hairpin configuration
❑ Odd number of conduit runs – One conduit run will be straight
❑ Even number of conduit runs – All conduit run are looped in hairpin configuration
❑ No – Use a straight run layout

Example: RaySol heating cable
Is Side A x 2 ≤ to the maximum circuit length?
0 Yes – Conduit can be looped in hairpin configuration
0 Odd number of conduit runs – One conduit run will be straight
Layout: Run in two hairpin loops and one straight run

252

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THERMAL MANAGEMENT SOLUTIONS

Step  Determine the heating cable layout and length

Fire Sprinkler System
Freeze Protection

5. Determine end allowances and kit connection kit allowances (see Table 6) and total heating cable length required.
x 8 ft =
Determine end allowances
Number of
x 8 ft =
hairpin conduits
Number of
hairpin conduits
x 8 ft =
Number of straight
x 8 ft =
run conduits
Number of straight
run conduits
Heating
cable length for end allowances
Heating cable length for end allowances

x 8 ft =

Number of2
hairpin conduits
Number of
1
hairpin conduits

Roof and Gutter
De-Icing

Example: RaySol heating cable
2

16 ft

x 8 ft =
x 8 ft =

16 ft
8 ft

Number of1straight
8 ft
x 8 ft =
run conduits
Number of straight
run conduits
Heating
cable length for end allowances

24 ft

Surface Snow
Melting – MI

24 ft
4 ftend
= allowances
Heating cable lengthx for
Number
of
FTC-XC
Determine connection kit allowances
kits for hairpin conduits
x 4 ft =
Number of FTC-XC x 4 ft =
Number
of FTC-XC
kits
for hairpin
conduits
kits for straight run conduits
x 4 ft =
Numbercable
of FTC-XC
Heating
length for connection kit allowances
kits for straight run conduits

Surface Snow
Melting – ElectroMelt

Heating cable length for connection kit allowances

Example: RaySol heating cable
2

x 4 ft =

8 ft

Heating cable length
for connection kit
allowances (ft/m)

Total heating cable
length required (ft/m)
Floor Heating

Heating cable length
for end allowances
(ft/m)

Freezer Frost
Heave Prevention

Number of FTC-XC
kits for hairpin
conduits
2
8 ft
x 4 ft =
1
4 ft
Number of FTC-XC
x 4 ft =
kits for hairpin conduits
Number of FTC-XC
kits for straight
run conduits 4 ft
1
x 4 ft =
12 ft
+ connection kit allowances
+
=
Numbercable
of FTC-XC
Heating
length for
kits
for straight
run conduits
Heating
cable length
Heating cable length Heating cable length Total heating cable
for conduit runs
for end allowances
for connection kit
length required (ft/m)
12 ftruns and allowances
Determine
total
heating
cable (ft/m)
length
required for
conduit
(ft/m)
allowances
(ft/m)
Heating
cable
length
for connection
kit allowances
+
+
=
Heating cable length
for conduit runs
(ft/m)

Example: RaySol heating cable
400 ft

Heating cable length
for conduit runs (ft)
400 ft

Heating cable length
for end allowances (ft)
24 ft

Heating cable length
for end allowances (ft)

THERMAL MANAGEMENT SOLUTIONS

12 ft

436 ft

Heating cable length
for connection kit
allowances (ft)
12 ft
=

Total heating cable
length required (ft)

Heating cable length
for connection kit
allowances (ft)

Total heating cable
length required (ft)

436 ft

EN-FreezerFrostHeavePrevention-DG-H58139

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253

Technical Data
Sheets

Heating cable length
for conduit runs (ft)

24 ft

Pipe Freeze Protection
and Flow Maintenance

RaySol and MI Heating Cable in Conduit Freezer Frost Heave Prevention Design Worksheet

Freezer Frost Heave Prevention – RaySol and MI Heating Cable System
Step  Determine the electrical parameters
RaySol heating cable in conduit

MI heating cable in conduit

Determine number of circuits
Circuit breaker rating (A): ______________
Number of circuits:
______________

Determine circuit breaker rating and number of circuits
Circuit breaker rating (A): ______________
Number of circuits:
______________

(from Step 4, Table 5)
(from Step 4)

Calculate circuit breaker load

(

Circuit breaker
rating (A)

Circuit breaker
rating (A)
20 A
Circuit breaker

x 0.8 x

Calculate circuit breaker rating and number of circuits

)

Supply
voltage

)

Supply
voltage
208 V

)

Supply

/ 1000 =

Example:
RaySol heating
cable
voltage
rating (A)

(

20 A
Circuit breaker
rating (A)

x 0.8 x

208 V

)

Supply
voltage

/ 1000 =

x 1.25)
(
( Total currentx 1.25)

Circuit breaker load
(kW)

(A)
Total current
(A)

Circuit breaker load
(kW)
3.3 kW
Circuit breaker load

=
=
= Minimum circuit = Circuit breaker
breaker
rating
(A)* Circuit
rating
(A)
Minimum
circuit
breaker
breaker rating (A)*
rating (A)

=
= Number of circuits
Number of circuits
*Use next largest available circuit breaker or break into smaller circuits
*Use next largest available circuit breaker or break into smaller circuits

Example: MI heating cable

3.3 kW
Circuit breaker load

11.5 A

( 11.5 A x 1.25)
( Total currentx 1.25)
(A)
Total current
(A)

14.4 A
15 A
=
=
14.4 A
15 A
= Minimum circuit = Circuit breaker
breaker
rating
(A)* Circuit
rating
(A)
Minimum
circuit
breaker
breaker rating (A)*
rating (A)

1
=
1
= Number of circuits
Number of circuits
*Use next largest available circuit breaker or break into smaller circuits
*Use next largest available circuit breaker or break into smaller circuits
Calculate total transformer load
+
1
CBLCBL
1

+
2
CBLCBL
2

+
CBLCBL
... 3 ...
3

Calculate total transformer load
(
+
+
+
+
N
CBLCBL
N

=
Total
transformer
Total
transformer
loadload
(kW)(kW)

Example: RaySol heating cable
3.3 kW
3.3 kW
1
CBLCBL
1

) / 1000 =

Cable1 (W) Cable2 (W) Cable3 (W)... CableN (W)
(
+
+
+
) / 1000 =
Cable1 (W) Cable2 (W) Cable3 (W)... CableN (W)

Total transformer
load (kW)
Total transformer
load (kW)

Example: MI heating cable

3.3 kW
3.3 kW

( 475 W + 475 W + 475 W + 475 W + 475 W ) / 1000 =

Total
transformer
Total
transformer
loadload
(kW)(kW)

Cable
Cable
Cable
Cable
Cable
( 475 W 1+ 475 W 2+ 475 W 3+ 475 W 4+ 475 W )5 / 1000 =
Cable1

Cable2

Cable3

Cable4

Cable5

2.4 kW

Total2.4
transformer
kW
load
Total transformer
load

Step  Select the connection kits and accessories
Connection kits and accessories Description

Quantity

❑ FTC-XC

Power connection and end seal

____________

❑ FTC-HST

Low-profile splice/tee

____________

❑ RayClic-E

Extra end seal

____________

❑ D1297TERM4

Cast aluminum junction box (for MI cable only)

____________

Example:

0 FTC-XC
0 D1297TERM4

254

Power connection and end seal

(for RaySol)

Cast aluminum junction box (for MI cable only)

(for MI)

EN-FreezerFrostHeavePrevention-DG-H58139

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THERMAL MANAGEMENT SOLUTIONS

Step  Select the control system
Quantity

❑ ECW-GF

Electronic thermostat with 25-ft sensor

____________

T ECW-GF-DP

Remote display panel for ECW-GF

____________

❑ MI-GROUND-KIT

Grounding kit for nonmetallic enclosures

____________

❑ C910-485

Microprocessor-based single-point heat-trace controller

____________

❑ ACS-UIT2

ACS-30 user interface terminal

____________

❑ CS-PCM2-5

ACS-30 power control panel

____________

❑ ProtoNode-LER

Multi-protocol gateway

____________

❑ ProtoNode-RER

Multi-protocol gateway

____________

❑ RTD10CS

Resistance temperature device for DigiTrace C910-485 & ACS-30

____________

❑ RTD-200

Resistance temperature device for DigiTrace C910-485 & ACS-30

____________

❑ RTD50CS

Resistance temperature device for DigiTrace C910-485 & ACS-30

____________

Example:

0 DigiTrace C910-485

Microprocessor-based single-point heat-trace controller

Roof and Gutter
De-Icing

Description

Fire Sprinkler System
Freeze Protection

Thermostats, controllers,
and accessories

Description

Quantity

❑ HTPG

Heat-tracing power distribution panel for group control

____________

Contactors

Description

Quantity

❑ E104

Three-pole, 100 A per pole contactor

____________

❑ E304

Three-pole, 40 A per pole contactor

____________

Surface Snow
Melting – MI

Step  Select the power distribution
Power distribution

Pipe Freeze Protection
and Flow Maintenance

RaySol and MI Heating Cable in Conduit Freezer Frost Heave Prevention Design Worksheet

Surface Snow
Melting – ElectroMelt

Step  Complete the Bill of Materials
Use the information recorded in this worksheet to complete the Bill of Materials.

Freezer Frost
Heave Prevention
Floor Heating

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Freezer Frost Heave Prevention – RaySol and MI Heating Cable System
MI Cables Directly Embedded Freezer Frost Heave Prevention Design Worksheet
Step  Determine the freezer configuration
Determine freezer
operating
temperature

Determine freezer area (from scale drawing)

Side A (length)
(ft/m)

Side B (width)
(ft/m)

Freezer area
(ft2/m2)

Record insulation
R-value

Supply
voltage

Phase

_____________
______________°F/°C

ft2·°F·hr/Btu

_____ Volts

_____ Phase

–30°F

R-20 (20 ft2 ·°F·hr/
Btu)

208 V

Single
phase

Example:
40 ft
Side A (length)
(ft)

20 ft

Side B (width)
(ft)

800 ft2
Freezer area (ft2)

Step  Determine the heat loss and freezer load
Based on the insulation R-value and freezer operating temperature you recorded in Step 1, use Table 11 to select the following:

Design power _______________W/ft2 (W/m2)

Freezer load _______________W/ft2 (W/m2)

Example:
1.1 W/ft2

1.1 W/ft2

Design power

Freezer load

Step  Select the heating cable, layout and length
Use Table 12 and Table 13 to select your heating cable and determine your cable wattage.

Heating cable voltage
❑ 120 V
❑ 208 V
❑ 240 V
❑ 277 V
❑ 347 V
Design power
(W/ft2) / (W/m2)

Area (ft2/m2)

Power required
(W)

Catalog number

Cable wattage
(W)

Heated length
(ft)

Quantity

885 W

245 ft

Cable wattage
(W)

Heated length
(ft)

Quantity

Example:

 208 V
1.1 W/ft2
Design power
(W/ft2)

256

800 ft2
Area (ft )
2

880 W
Power required
(W)

SUB19
Catalog number

EN-FreezerFrostHeavePrevention-DG-H58139

11/13

THERMAL MANAGEMENT SOLUTIONS

Step  Determine the heating cable spacing
Imperial

Metric

x 12 /

=
Heated length (ft)

x 100 /
Cable spacing (in)

Area (m2)

=
Heated length (m)

Cable spacing (cm)

If necessary, round to whole number.

Example:
800 ft2

245 ft

x 12 /

(

Area (ft2)
x 1.25
Total current (A)

)

39.2 in rounded to 39 in

Cable spacing (in) =
= Heated length (ft)
Minimum circuit breaker rating (A)*

Circuit breaker rating (A)

Number of circuits

Determine circuit breaker rating and number of circuits
Example

Circuit breaker rating (A): _____________________________

Number of circuits: _____________________________
1
15 A
5.4 A
4.3 A
1.25 ) rating
=
=
=
(Calculate circuit xbreaker
and number of circuits
Total current (A)
Minimum circuit breaker rating (A)*
Circuit breaker rating (A)
Number of circuits
(
x 1.25 ) =
=
=
*Use
largest
breakercircuit
or break
into smaller
Total next
current
(A) available circuit
Minimum
breaker
rating circuits
(A)*
Circuit breaker rating (A)
Number of circuits

Surface Snow
Melting – MI

*Use next largest available circuit breaker or break into smaller circuits
Example
4.3 A

Total current (A)

x 1.25

)

15 A

5.4 A
Minimum circuit breaker rating (A)*

Circuit breaker rating (A)

Roof and Gutter
De-Icing

*Use 
next
largest available
circuit breaker
or break into smaller circuits
Step
Determine
the electrical
parameters

(

Fire Sprinkler System
Freeze Protection

Area (ft2)

Pipe Freeze Protection
and Flow Maintenance

MI Cables Directly Embedded Freezer Frost Heave Prevention Design Worksheet

Number of circuits

*Use next largest available circuit breaker or break into smaller circuits

Surface Snow
Melting – ElectroMelt

Calculate total transformer load

(

+
Cable1 (W)

+
Cable2 (W)

)

+
Cable3 (W)...

/ 1000

CableN (W)

Total transformer load (kW)

Example
885 W

(

)

/ 1000

Cable1

Total transformer load
+

Cable1 (W)

+
Cable2 (W)

+
Cable3 (W)...

Step  Select the accessories

)

/ 1000

CableN (W)

Total transformer load (kW)

Accessory

Description

Quantity

❑ D1297TERM4
885 W
(
) / 1000
Cable1
Example:

Cast aluminum junction box

_____________

Example

Cast aluminum junction box

Total transformer load

EN-FreezerFrostHeavePrevention-DG-H58139

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257

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

0.9 kW

Floor Heating

0 D1297TERM4

Freezer Frost
Heave Prevention

(

0.9 kW

Freezer Frost Heave Prevention – RaySol and MI Heating Cable System
Step  Select the control system
Thermostats, controllers,
and accessories

Description

Quantity

❑ ECW-GF

Electronic thermostat with 25-ft sensor

____________

T ECW-GF-DP

Remote display panel for ECW-GF

____________

❑ MI-GROUND-KIT

Grounding kit for nonmetallic enclosures

____________

❑ C910-485

Microprocessor-based single-point heat-trace controller

____________

❑ ACS-UIT2

ACS-30 user interface terminal

____________

❑ ACS-PCM2-5

ACS-30 power control panel

____________

❑ ProtoNode-LER

Multi-protocol gateway

____________

❑ ProtoNode-RER

Multi-protocol gateway

____________

❑ RTD10CS

Resistance temperature device for DigiTrace C910-485 & ACS-30

____________

❑ RTD-200

Resistance temperature device for DigiTrace C910-485 & ACS-30

____________

❑ RTD50CS

Resistance temperature device for DigiTrace C910-485 & ACS-30

____________

Example:
0 DigiTrace C910-485

Microprocessor-based single-point heat-trace controller

Step  Select the power distribution
Power distribution

Description

Quantity

❑ HTPG

Heat-tracing power distribution panel for group control

_____________

Contactors

Description

Quantity

❑ E104

Three-pole, 100 A per pole contactor

_____________

❑ E304

Three-pole, 40 A per pole contactor

_____________

Step  Complete the Bill of Materials
Use the information recorded in this worksheet to complete the Bill of Materials.

258

EN-FreezerFrostHeavePrevention-DG-H58139

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THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection
and Flow Maintenance

Insulated, and QuickNet Heating SystemS

Technical Data
Sheets

259

Floor Heating

11/13

Freezer Frost
Heave Prevention

EN-FloorHeatingSystem-DG-H58157

Surface Snow
Melting – ElectroMelt

THERMAL MANAGEMENT SOLUTIONS

Surface Snow
Melting – MI

Contents
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260
How to Use this Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260
Safety Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261
System Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262
Typical System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263
Self-Regulating Heating Cable Construction. . . . . . . . . . . . . . . . . . . . . . . . . . 265
MI Heating Cable Construction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267
QuickNet Floor Heating Mat Construction. . . . . . . . . . . . . . . . . . . . . . . . . . . . 268
Floor Heating Application Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269
Design Step by Step. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269
Step 1 Determine the application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 270
Step 2 Select the heating cable system and installation method. . . . . . . 271
Step 3 Determine the floor configuration. . . . . . . . . . . . . . . . . . . . . . . . . . 271
Step 4 Determine the heating cable spacing, layout and length. . . . . . . . 275
Step 5 Determine the electrical parameters . . . . . . . . . . . . . . . . . . . . . . . 298
Step 6 Select the connection kits and accessories . . . . . . . . . . . . . . . . . . 302
Step 7 Select the control system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 305
Step 8 Select the power distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 308
Step 9 Complete the Bill of Materials. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313
Floor Heating Pre-Design Worksheet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 314
RaySol Heating Cable Floor Heating Design Worksheet . . . . . . . . . . . . . . . . . . . . . 315
Heat Loss Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315
Comfort Floor Heating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 318
MI Heating Cable Floor Heating Design Worksheet. . . . . . . . . . . . . . . . . . . . . . . . . 323
Heat Loss Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323
Comfort Floor Heating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 325
Radiant Space Heating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326
QuickNet Floor Heating System Design Worksheet. . . . . . . . . . . . . . . . . . . . . . . . . 331
Comfort Heating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 331

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This step-by-step design guide provides the tools necessary to design a floor
heating system using Raychem RaySol self-regulating heating cable system,
Pyrotenax Mineral Insulated heating cable system, or Raychem QuickNet floor
heating system. For other applications or for design assistance, contact your Pentair
Thermal Management representative or phone Pentair Thermal Management at
(800) 545‑6258. Also, visit our web site at www.pentairthermal.com.

Fire Sprinkler System
Freeze Protection

Floor Heating – RaySol, Mineral

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
Introduction
Pentair Thermal Management offers three different heating cable systems for floor
heating: Raychem RaySol, Pyrotenax MI, and Raychem QuickNet. RaySol heating
cables and MI heating cables can be directly attached to the bottom of the concrete
floor or be directly embedded in the concrete floor or in a thick mortar bed. QuickNet
floor heating mats must be embedded in thin-set or self-leveling mortar.
If your application conditions are different than described in this guide, or if you have
any questions, contact your Pentair Thermal Management representative or contact
Pentair Thermal Management directly at (800) 545-6258.
How to Use this Guide
This design guide presents Pentair Thermal Management’ recommendations for
designing floor heating systems. It provides design and performance data, electrical
sizing information, control selection and heating-cable layout suggestions. Following
these recommendations will result in a reliable, energy-efficient system.
Follow the design steps and use the appropriate design worksheets to document the
project parameters that you will need for your project’s Bill of Materials.
Other Required Documents

This guide is not intended to provide comprehensive installation instructions. For
complete floor heating system installation instructions, please refer to the following
additional required documents:
• Raychem RaySol Floor Heating and Freezer Frost Heave Prevention Installation
and Operation Manual (H58138)
• Pyrotenax Mineral Insulated Heating Cable Floor Heating and Freezer Frost
Heave Prevention Installation and Operation Manual (H58137)
• Raychem QuickNet System Installation Manual (H57704)
• Additional installation instructions are included with the connection kits, thermostats, controllers, and accessories
If you do not have these documents, you can obtain them from the Pentair Thermal
Management web site at www.pentairthermal.com.
For products and applications not covered by this design guide, please contact your
Pentair Thermal Management representative or call Pentair Thermal Management
directly at (800) 545-6258.
Safety Guidelines
As with any electrical equipment, the safety and reliability of any system depends
on the quality of the products selected and the manner in which they are installed
and maintained. Incorrect design, handling, installation, or maintenance of any of
the system components could damage the system and may result in inadequate
performance, overheating, electric shock, or fire. To minimize these risks and to
ensure that the system performs reliably, read and carefully follow the information,
warnings, and instructions in this guide.

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This symbol identifies important instructions or information.

Pentair Thermal Management’ standard limited warranty applies to Raychem and
Pyrotenax Floor Heating Systems.

Roof and Gutter
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Warranty

Fire Sprinkler System
Freeze Protection

This symbol identifies particularly important safety warnings that must be
followed.

Pipe Freeze Protection
and Flow Maintenance

Introduction

For Raychem RaySol and Pyrotenax MI heating cables

For Raychem QuickNet floor heating system

The QuickNet system standard limited warranty is two (2) years from the date of
purchase. An extension of the limited warranty period to fifteen (15) years is available
for the QuickNet mat only, if a properly completed online warranty form is submitted
within thirty (30) days from the date of purchase. You can access the complete
warranty on our web site at www.raychemfloorheating.com.

Surface Snow
Melting – MI

Surface Snow
Melting – ElectroMelt
Freezer Frost
Heave Prevention
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System Overview
There are three main floor heating applications:
• Heat loss replacement
• Comfort floor heating (includes concrete floor heating)
• Radiant space heating
Pentair Thermal Management offers three different heating cable systems for floor
heating: Raychem RaySol self-regulating, Pyrotenax MI, and Raychem QuickNet.
Each product has specific design and installation considerations and this guide will
address how to design the system that best suits your needs. RaySol and MI heating
cables can be installed in multiple methods; however, the most common methods
will be covered.
Heat Loss Replacement

Raychem RaySol and Pyrotenax MI heating cables can be used to eliminate the
chill felt from the heat lost through floors over non-heated areas such as garages,
loading docks or arcades. The heating cables achieve this by replacing the heat
normally lost through the floor insulation over a cold space.
For heat loss replacement, both RaySol and MI heating cables can be used and are
attached to the bottom of the concrete floor.
Comfort Floor Heating

QuickNet floor heating mats and Raychem RaySol and Pyrotenax MI heating
cables can heat floors in places such as lobbies, foyers, bathrooms, kitchens and
gymnasiums. The heating cables are used to raise the floor temperature to 80°F
(27°C) or warmer so it is comfortable to walk on the floor in bare feet.
For comfort floor heating, all three heating cable technologies can be used. RaySol
and HDPE jacketed copper sheathed MI heating cables can be directly embedded in
mortar or concrete. QuickNet heating mats must be embedded in thin-set or selfleveling mortar under ceramic tile or natural stone.
Radiant Space Heating

RaySol and MI heating cable systems can be designed to provide primary space
heating for rooms with concrete floors. RaySol heating cable systems must be
custom designed through Pentair Thermal Management. Contact your Pentair
Thermal Management representative or call Pentair Thermal Management at
(800) 545-6258 for design assistance.
For radiant space heating, both RaySol and MI heating cables can be used and are
directly embedded in mortar or concrete.

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Typical System
The following illustration shows a typical heat loss replacement system.

Pipe Freeze Protection
and Flow Maintenance

System Overview

Splice Kit

Fire Sprinkler System
Freeze Protection

Power Connection Kit

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Controller

Surface Snow
Melting – MI

Heating cable

Surface Snow
Melting – ElectroMelt

Mineral insulated

Heating cable

RaySol

Fig. 1 Typical heat loss replacement system

The following illustration shows a typical heat loss replacement installation.

Freezer Frost
Heave Prevention

Concrete

Heating cable
Insulation

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Floor Heating

Fig. 2 Typical heat loss replacement installation

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
The following illustration shows a typical comfort floor heating system.
Thermostat

Power Connection Kit

Heating cable

RaySol
Heating cable

Mineral insulated

Fig. 3 Typical comfort floor heating system

The following illustration shows a typical comfort floor heating system installation.
RaySol heating cable
in mortar

MI heating cable
in mortar

in concrete

in concrete
Tile

Tile

Tile
Thin-set or self-leveling mortar
Thin-set or self-leveling mortar

Mortar

Mortar
Concrete

QuickNet mat
tile, laminate & hardwood floors

Concrete

Insulation

MI
heating
cable

RaySol
heating
cable
Insulation

Fig. 4 Typical comfort floor heating system installation

A radiant space heating system is similar to the illustration in Fig. 3. RaySol heating
cable systems must be custom designed through Pentair Thermal Management.
Contact your Pentair Thermal Management representative or call Pentair Thermal
Management at (800) 545-6258 for design assistance.

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Table 1 summarizes which heating cable can be used for which floor heating
application.

Application

RaySol

QuickNet

Heat loss replacement

–

Comfort floor heating

Radiant space heating

–

Fire Sprinkler System
Freeze Protection

Table 1 Floor Heating Applications and Recommended Heating
Cables

Pipe Freeze Protection
and Flow Maintenance

System Overview

Self-Regulating Heating Cable Construction
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De-Icing

Raychem RaySol self-regulating heating cables are comprised of two parallel
nickel-coated bus wires in a cross-linked polymer core, a tinned copper braid, and a
fluoropolymer outer jacket. These cables are cut to length simplifying the application
design and installation.

Fluoropolymer outer jacket

Surface Snow
Melting – MI

Tinned-copper braid
Modified polyolefin inner jacket
Self-regulating conductive core
Nickel-plated copper bus wires

Fig. 5 Typical RaySol heating cable construction

As the temperature rises, the core expands microscopically. This expansion
increases electrical resistance and the number of electrical paths decreases. The
heating cable automatically reduces its output.

Surface Snow
Melting – ElectroMelt

Freezer Frost
Heave Prevention
Floor Heating

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At high temperature,
there are few conducting paths and output is
correspondingly lower,
conserving energy
during operation.

re
g
Se

Temperature

Power

Constant wattage

lf-

At moderate temperature,
there are fewer conducting
paths because the heating
cable efficiently adjusts by
decreasing output, eliminating
any possibility of overheating.

Resistance

At low temperature,
there are many
conducting paths,
resulting in high output
and rapid heat-up. Heat
is generated only when it
is needed and precisely
where it is needed.

Constant wattage

lf-

re
g

ing

Temperature

Fig. 6 Self-regulating heating cable technology
Codes and Approvals

-w

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MI Heating Cable Construction

Heating cable construction
Insulation
(magnesium oxide)

HDPE jacket
(for embedded cables only)

Heating
conductor

Fire Sprinkler System
Freeze Protection

Pyrotenax MI heating cables used for floor heating applications are comprised of
a single conductor surrounded by magnesium oxide insulation and a solid copper
sheath. For embedded applications, such as comfort floor heating and radiant space
heating, the heating cable also has an extruded high density polyethylene (HDPE)
jacket.

Pipe Freeze Protection
and Flow Maintenance

System Overview

Copper sheath

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De-Icing

Single-conductor cable (61 series)
Fig. 7 Typical MI heating cable construction

Type SUA

Heated length

Surface Snow
Melting – MI

The heating cables are supplied as complete factory-fabricated assemblies
consisting of an MI heating cable that is joined to a section of MI non-heating cold
lead and terminated with NPT connectors. Two configurations are available: Type
SUA consisting of a looped cable joined to a single 7 ft (2.1 m) cold lead with one
1/2-in NPT connector; and Types SUB, HLR and FH consisting of a single run of
cable with a 15 ft (4.6 m) cold lead and a 1/2-in NPT connector on each end.
Cold lead length

Hot/cold
joint

NPT threaded
connector

Types SUB, HLR and FH
Cold lead length

Heated length

Cold lead length

Surface Snow
Melting – ElectroMelt

Hot/cold
joint

NPT threaded
connector

Fig. 8 Configurations for surface mount or directly embedded in concrete installations

Pentair Thermal Management offers all the components necessary for system
installation. Details of these components and additional accessories can be found
later in this design guide.

The MI system is c-CSA-us Certified for comfort floor heating and radiant space
heating applications. For heat loss replacement applications where the cable is
attached to the bottom of the concrete floor, contact Pentair Thermal Management
for additional information.

Freezer Frost
Heave Prevention

Codes and Approvals

-PS

Floor Heating

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Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
QuickNet Floor Heating Mat Construction
Raychem QuickNet is an electric floor heating system for installation directly under
ceramic tiles, natural stone, laminate and engineered wood. The floor heating mats
are pre-terminated for use with 120, 208 or 240 V, and are available in 20-inch
(51 cm) widths for areas ranging from 10 to 200 ft2 (0.9 to 18.6 m2).
QuickNet heating cables are comprised of two fluoropolymer jacketed conductors,
ground wires, Mylar foil and a fluoropolymer outer jacket.

Outer fluoropolymer jacket
Mylar foil
Fluoropolymer
jacket

Conductors
Ground wires
Fluoropolymer jacket

Fig. 9 QuickNet heating cable construction

The QuickNet floor heating system includes the heating cable woven into an
adhesive-backed fiberglass mesh that allows for simple roll-out installation
without worrying about heating cable spacing. The mats emit no measurable
electromagnetic fields due to the shielded dual conductor design and require
only one cold lead connection, making it easy to lay out and install. Each standard
QuickNet floor heating kit includes a programmable Energy Star-rated QuickStat-TC
thermostat with built-in GFCI protection and floor sensor. Extension kits without the
thermostat are also available.

QuickNet floor
heating mat

QuickStat-TC
thermostat
Floor
temperature
sensor

Cold lead

Fig. 10 QuickNet floor heating system components

Codes and Approvals

Installation of Raychem QuickNet floor heating systems are governed by national
and local electrical codes. Pentair Thermal Management, the NEC, and the CEC
all require the use of ground-fault protection to reduce the risk of fire caused by
damage or improper installation.
The QuickNet system is c-CSA-us Certified for use in nonhazardous locations.

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Floor Heating Application Design

For products and applications not covered by this design guide, please contact your
Pentair Thermal Management representative or call Pentair Thermal Management
directly at (800) 545-6258.

Roof and Gutter
De-Icing

Design Step by Step

Fire Sprinkler System
Freeze Protection

This section guides you through the steps necessary to design the correct system for
your application. The examples provided in each step are intended to incrementally
illustrate the project parameter output for sample designs from start to finish. As
you go through each step, use the appropriate design worksheets to document your
project parameters, so that by the end of this section, you will have the information
you need for your Bill of Materials.

Pipe Freeze Protection
and Flow Maintenance

Floor Heating Application Design

Your system design requires the following essential steps:


Determine the application
–– Heat loss replacement
–– Comfort floor heating
–– Radiant space heating

 Select the heating cable system and installation method
Surface Snow
Melting – MI

–– Heat loss replacement
–– Comfort floor heating
–– Radiant space heating

 Determine the floor configuration
 Determine the heating cable spacing, layout, and length
–– RaySol heating cables

Surface Snow
Melting – ElectroMelt

–– MI heating cables
–– QuickNet floor heating mats

 Determine the electrical parameters
 Select the connection kits and accessories
 Select the control system
 Select the power distribution
Depending on the heating cable system you select, use one of the following
worksheets to help you document the project parameters you will need for your
project’s Bill of Materials:
• Preliminary worksheet for determining your project’s application and product line
on page 314.

Freezer Frost
Heave Prevention

 Complete the Bill of Materials

• The “RaySol Heating Cable Floor Heating Design Worksheet” on page 315.
• The “MI Heating Cable Floor Heating Design Worksheet” on page 323.

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Floor Heating

• The “QuickNet Floor Heating System Design Worksheet” on page 331.

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
Floor Heating System
Design Steps
1. Determine the
application
2. Select the heating
cable system and
installation method
3. Determine the
floor configuration
4. Determine the
heating cable spacing,
layout and length
5. Determine the
electrical parameters
6. Select the
connection kits
and accessories
7. Select the control
system
8. Select the power
distribution
9. Complete the Bill
of Materials

Step 1 Determine the application
This step further defines the specific application and design assumptions. Once the
application is verified, you will select the appropriate heating system in Step 2.
Heat Loss Replacement
A heat loss replacement system uses RaySol and MI heating cables for concrete
floors built over garages, loading docks, arcades, or other cold spaces. The design
goal is to prevent the floor over a cold space from cooling below room temperature.
The heating cable system achieves this by replacing the heat normally lost through
the floor insulation over a cold space.
A successful design must conform to the following requirements:
• The floor to be heated is indoors where the room temperature above the floor is
approximately 70°F (21°C).
• RaySol and MI heating cables will be attached to the bottom of the concrete floor.
If it is necessary to install RaySol or MI cables in conduit or to directly embed the
MI cables in the concrete floor, contact your Pentair Thermal Management representative or Pentair Thermal Management at (800) 545-6258 for design
assistance.
• The bottom of the floor is insulated.
Comfort Floor Heating
A comfort floor heating system uses RaySol, MI heating cables, or QuickNet floor
heating mats for bathrooms, kitchens, foyers, schools, or gymnasiums. The design
goal is to raise the floor temperature to 80°F (27°C) or above so it is comfortable
to walk on the floor with bare feet. RaySol and HDPE jacketed copper sheathed MI
heating cables are directly embedded in mortar or concrete. QuickNet heating mats
must be embedded in thin-set or self-leveling mortar and must be installed under
ceramic or natural stone.
A successful design must conform to the following requirements:
• For RaySol, the floor to be heated is indoors, and is located on grade or is located
above an area where the ambient temperature is approximately 70°F (21°C) or the
bottom of the floor is insulated.
• For MI and QuickNet, the floor to be heated is indoors, and is located on grade or
is located above an area where the ambient temperature is approximately 70°F
(21°C) or the bottom of the floor is insulated with minimum R-20 insulation when
exposed to the outside ambient air temperature.
• RaySol and HDPE jacketed copper sheathed MI heating cables are embedded in
a standard concrete floor or embedded in a mortar layer (at least 3/4 in (2 cm)
thick) under ceramic tile or natural stone.
• QuickNet floor heating mats are embedded in a thin-set or self-leveling mortar
layer and installed under ceramic tile or natural stone.
• The heating cables or floor heating mats shall not be installed in shower floors,
under tubs and spas, or under other permanent fixtures.
Radiant Space Heating
RaySol and MI heating cable systems can be designed to provide primary space
heating for rooms with concrete floors. RaySol heating cable systems must be
custom designed by Pentair Thermal Management. Contact your Pentair Thermal
Management representative or call Pentair Thermal Management at (800) 545-6258
for design assistance.
A successful design must conform to the following requirements:
• The Btu requirement and total heated area are provided by the customer.
• The bottom of the floor is insulated or located on grade.

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• RaySol and HDPE jacketed copper sheathed MI heating cables are embedded in a
concrete floor or embedded in mortar (at least 3/4 in (2 cm) thick), under ceramic
tile or natural stone.

Floor Heating System
Design Steps

Step 2 Select the heating cable system and installation method

1. Determine the
application

3. Determine the
floor configuration

Table 2 Installation Methods by Heating Cable and Application
Heat loss
replacement

4. Determine the
heating cable spacing,
layout and length

Installation
method

5. Determine the
electrical parameters
6. Select the
connection kits
and accessories

8. Select the power
distribution

Radiant space
heating

RaySol

Attach to bottom

–

QuickNet RaySol
–

–

MI
–

Embed in concrete

–

Embed in mortar bed

–

Embed in thin-set or
self-leveling mortar

–

Surface Snow
Melting – MI

7. Select the control
system

Comfort floor heating

9. Complete the Bill
of Materials

Step 3 Determine the floor configuration

1. Determine the
application
2. Select the heating
cable system and
installation method
3. Determine the
floor configuration

5. Determine the
electrical parameters
6. Select the
connection kits
and accessories
7. Select the control
system

In this design guide, two floor layouts will be used to illustrate all floor heating
applications. The first example will be for heat loss replacement and the second
example will be for comfort floor heating and radiant space heating.
Heat Loss Replacement
Gathering information

When using this guide to design a system you need the following information:
• Size and layout of exposed floor
• Minimum ambient design temperature
• Insulation R-value

9. Complete the Bill
of Materials

• Control requirements

Floor Heating

8. Select the power
distribution

• Supply voltage and phase

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Freezer Frost
Heave Prevention

4. Determine the
heating cable spacing,
layout and length

All floor heating applications require determining the area to be heated. For heat
loss replacement and comfort floor heating you will also need the minimum ambient
design temperature and the insulation R-value. For radiant space heating you will
need to provide the Btu requirement.

Surface Snow
Melting – ElectroMelt

Floor Heating System
Design Steps

Roof and Gutter
De-Icing

2. Select the heating
cable system and
installation method

In this step you will determine the heating cable system and installation method to
suit your specific needs. Table 2 indicates the various installation methods that will
be discussed in this design guide for each heating cable technology as it pertains to
each application.

Fire Sprinkler System
Freeze Protection

• The heating cable shall not be installed in shower floors, under tubs and spas, or
under other permanent fixtures.

Pipe Freeze Protection
and Flow Maintenance

Floor Heating Application Design

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
PREPARE SCALE DRAWING

Draw to scale the floor area to be heated. Carefully note the limits of the area to be
heated. Show all concrete joints on the drawing and note the voltage supply location,
and location and size of obstacles, such as floor drains, pipe penetrations, conduit
runs, columns and fixtures.
For heat loss replacement, the entire floor is considered the area to be heated.
Heated area = Total area
Side A
80 ft (24.4 m)

Side B
40 ft (12.2 m)

Fig. 11 Floor layout for heat loss replacement example
DETERMINE MINIMUM AMBIENT DESIGN TEMPERATURE

Determine the lowest temperature that is expected below the floor insulation.
RECORD INSULATION R-VALUE

The insulation R-value is the thermal resistance of the floor’s insulation. Normally,
the R-value will be printed on the insulation material. If that is not the case, you can
calculate it by dividing the insulation thickness in inches by the insulation thermal
conductivity.
Example: RaySol heating cables for heat loss replacement
Heated area

80 ft x 40 ft = 3200 ft2 (see Fig. 11)
(24.4 m x 12.2 m = 297.4 m2)

Minimum ambient design temperature –10°F (–23°C)
Insulation R-value

R-20 (20 ft2·°F·hr/Btu)

Supply voltage and phase

208 V, single-phase

Control requirements

Electronic thermostat, monitoring requested

Example: MI heating cables for heat loss replacement
Heated area

80 ft x 40 ft = 3200 ft2 (see Fig. 11)
(24.4 m x 12.2 m = 297.4 m2)

Minimum ambient design temperature –10°F (–23°C)
Insulation R-value

R-20 (20 ft2·°F·hr/Btu)

Supply voltage and phase

208 V, three-phase

Control requirements

Electronic thermostat, monitoring requested

Advance to Step 4, page 275.

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Comfort Floor Heating
Gathering information

Pipe Freeze Protection
and Flow Maintenance

Floor Heating Application Design

When using this guide to design a system you need the following information:
Fire Sprinkler System
Freeze Protection

• Size and layout of floor
• Minimum ambient design temperature
• Insulation R-value
• Supply voltage and phase
• Control requirements

Heated area = Total area – Permanent fixture space
Side A
34 ft (10.4 m)

Roof and Gutter
De-Icing

For comfort floor heating, it is also important to note the locations of shower floors,
tubs, spas, toilets, and other permanent fixtures and subtract these areas from the
total area.

Counter (22 ft2 / 2 m2)

Surface Snow
Melting – MI

Side B
20 ft (6.1 m)

Entrance

Hotel lobby

4 Columns
(11 ft2 / 1 m2)

DETERMINE MINIMUM AMBIENT DESIGN TEMPERATURE

Determine the lowest temperature that is expected below the floor insulation.
RECORD INSULATION R-VALUE

Example: Comfort floor heating (RaySol and MI heating cables, QuickNet heating
mats)
(34 ft x 20 ft) – (22 ft2 + 11 ft2) = 647 ft2
(see Fig. 12)
(10.4 m x 6.1 m) – (2 m2 + 1 m2) = 60.4 m2

Minimum ambient design temperature

10°F (–12°C)

Insulation R-value

R-30 (30 ft2·°F·hr/Btu)

Supply voltage and phase

208 V, single-phase

Control requirements

Electronic thermostat

Floor Heating

Heated area

Freezer Frost
Heave Prevention

Surface Snow
Melting – ElectroMelt

Fig. 12 Floor layout for comfort floor heating example

Advance to Step 4, page 275.

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Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
Radiant Space Heating
Gathering information

When using this guide to design a system you need the following information:
• Size and layout of floor
• The Btu requirement (heat loss) calculated by the engineer or architect
• Supply voltage and phase
• Control requirements
For radiant space heating, the heat loss, or Btu required, is based on the total area of
the room. However, the heating cable must not be installed under the area occupied
by columns, fixtures, shower floors, tubs and spas, toilets and other permanent
fixtures. To determine the area in which the heating cable will be installed, subtract
the area occupied by these permanent fixtures from the total area.
Heated area = Total area – Permanent fixture space
Side A
34 ft (10.4 m)

Counter (22 ft2 / 2 m2)
Side B
20 ft (6.1 m)

Entrance

Hotel lobby

4 Columns
(11 ft2 / 1 m2)

Fig. 13 Floor layout for radiant space heating example

Example: MI heating cables for radiant space heating
Floor area

(34 ft x 20 ft) – (22 ft2 + 11 ft2) = 647 ft2
(see Fig. 13)
(10.4 m x 6.1 m) – (2 m2 + 1 m2) = 60.4 m2

Btu requirement

34,800 Btu / hr (supplied by engineer)

Supply voltage and phase

208 V, single-phase

Control requirements

Electronic thermostat

Advance to Step 4.

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Floor Heating System
Design Steps

Step 4 Determine the heating cable spacing, layout and length

1. Determine the
application

3. Determine the
floor configuration
4. Determine the
heating cable spacing,
layout and length
5. Determine the
electrical parameters

• For RaySol self-regulating heating cable design
–– For heat loss replacement, see below.
–– For comfort floor heating, see page 279.
• For MI heating cable design
–– For heat loss replacement, see page 283.
–– For comfort floor heating, see page 288.
• For QuickNet floor heating design, see page 294.

7. Select the control
system

RaySol sELF-rEGULATING heating cable system design

9. Complete the Bill
of Materials

Roof and Gutter
De-Icing

–– For radiant space heating, see page 292.

6. Select the
connection kits
and accessories

8. Select the power
distribution

Fire Sprinkler System
Freeze Protection

2. Select the heating
cable system and
installation method

In this step you will select the heating cable and determine the spacing, layout and
length. This section is organized by heating cable type with specific design criteria
for each application and installation method.

Pipe Freeze Protection
and Flow Maintenance

Floor Heating Application Design

Heat Loss Replacement
Design a RaySol heating cable system for heat loss replacement as follows:

Select the heating cable based on the operating voltage. For 120 V, select RaySol-1;
for 208–277 V, select RaySol-2.
Table 3 RaySol Heating Cable
Supply voltage

Catalog number

120 V

RaySol-1

208–277 V

RaySol-2

Supply voltage

208 V (from Step 3)

Catalog number

RaySol-2

Surface Snow
Melting – ElectroMelt

Example: RaySol heating cables for heat loss replacement

Surface Snow
Melting – MI

1. Select the appropriate RaySol heating cable

Freezer Frost
Heave Prevention
Floor Heating

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Sheets

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Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
2. Determine the RaySol heating cable spacing
Use the minimum ambient design temperature and the floor insulation R-value
(from Step 3) to select the correct spacing shown in Table 4 for heat loss
replacement. If the calculated R-value or minimum design temperature does not
match the values in the table, use the values that give the closer spacing.
Table 4 RaySol Heating Cable Spacing for Heat Loss Replacement
Floor insulation R-value (ft2·°F·hr/Btu)

Minimum ambient
design temperature
50°F (10°C)

R-10
30 in (73 cm)

R-20

R-30

36 in (91 cm)

R-40
36 in (91 cm)

30°F (–1°C)

24 in (61 cm)

30 in (76 cm)

36 in (91 cm)

10°F (–12°C)

21 in (53 cm)

30 in (76 cm)

36 in (91 cm)

–10°F (–23°C)

18 in (46 cm)

24 in (61 cm)

30 in (76 cm)

36 in (91 cm)

–30°F (–34°C)

15 in (38 cm)

24 in (61 cm)

30 in (76 cm)

36 in (91 cm)

If the space below the floor is maintained at 50–70°F (10–21°C), insulate the floor to
R-10 minimum and select a heating cable spacing from the 50°F (10°C) row in
Table 4.
Example: RaySol heating cables for heat loss replacement
Minimum ambient design temperature –10°F (–23°C) (from Step 3)
Insulation R-value

R-20 (from Step 3)

Heating cable spacing

24 in (61 cm)

3. Determine the RaySol heating cable layout and length
Estimate the heating cable length The length of heating cable and the number of
heating cable circuits can be estimated before a detailed layout is done if the heating
cable spacing, total heated area, and the available branch circuit breaker rating are
known. Fig. 14 shows typical layouts when the heating cable is directly attached to
the bottom of the floor.

Fig. 14 Typical heating cable layouts for heat loss replacement

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Estimate the heating cable length required:
Heated area (ft2) x 12
Spacing (in)

Estimated heating cable length (m) =

Heated area (m2) x 100

Fire Sprinkler System
Freeze Protection

Estimated heating cable length (ft) =

Pipe Freeze Protection
and Flow Maintenance

Floor Heating Application Design

Spacing (cm)
Side A
80 ft (24.4 m)

Surface Snow
Melting – MI

Fig. 15 RaySol heating cable layout for heat loss replacement

Example: RaySol heating cable length for heat loss replacement
Heated area

3200 ft2 (297.4 m2) (from Step 3, Fig. 11)

Estimated heating cable length

3200 ft2 x 12 / 24 in = 1600 ft

297.4 m2 x 100 / 61 cm = 487.5 m

Roof and Gutter
De-Icing

Side B
40 ft (12.2 m)

Junction boxes

4. Determine the maximum circuit length for the heating cable length

Table 5 Maximum RaySol Circuit Length in Feet (Meters) When
Attaching Heating Cable to the Bottom of the Floor (40°F (4°C)
Start-up)*
Circuit breaker size
(A)

120 V
ft

208 V
ft

240 V
ft

277 V
ft

Freezer Frost
Heave Prevention

Supply voltage

120

36.6

205

62.5

210

64.0

215

65.5

160

48.8

275

83.8

285

86.9

290

88.4

240

73.2

410

125.0

425

129.5

430

131.1

240

73.2

410

125.0

425

129.5

430

131.1

Calculate the estimated number of circuits as follows:
Estimated heating cable length (ft/m)
Maximum circuit length (ft/m)

Floor Heating

*For start-up temperatures less than 40°F (4°C), contact your Pentair Thermal Management representative.

Number of circuits =

Surface Snow
Melting – ElectroMelt

For the appropriate supply voltage, use Table 5 to select the maximum circuit length
which is closest to, but greater than the length calculated. If the estimated heating
cable length required is greater than the maximum circuit length, multiple circuits
must be used.

Round the number of circuits to the next larger whole number.

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Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
Example: RaySol heating cable length for heat loss replacement
Estimated heating cable length

1600 ft (487.5 m) (from earlier in this step)

Supply voltage

208 V (from Step 3)

Maximum circuit length

410 ft (125 m) (from Table 5)

Number of circuits

1600 ft / 410 ft = 4 circuits (rounded)

Power supply

Four 30 A circuit breakers (from Table 5)

5. Determine the additional heating cable allowance
Additional heating cable is required to make power connections and to route the
circuits to junction boxes. This extra heating cable need not be considered when
determining the maximum heating cable length for circuit breaker sizing. In order to
estimate the total heating cable length, you will need to take the estimated heating
cable length you already calculated, and then add heating cable allowances, as
follows:
Estimated total heating cable length = Estimated heating cable length + End allowances + Connection kit allowances

Table 6 RaySol Additional Heating Cable Allowance
Heating cable allowance Description

Length of cable

End allowances

From end of protective conduit to
junction box

4 ft (1 m) per end

Connection kit allowances

Required to assemble the
connection kit (one per circuit)

4 ft (1 m) per kit

Example: RaySol heating cable for heat loss replacement
Estimated heating cable length

1600 ft (487 m) (from earlier in this step)

End allowance

4 circuits x 4 ft per end x 2 ends = 32 ft (10 m)
(from Table 6)

Connection kit allowances

4 connection kits x 4 ft per kit = 16 ft (5 m)
(from Table 6)

Total heating cable allowances

32 ft (10 m) + 16 ft (5 m) = 48 ft (15 m)

Estimated total heating cable length 1600 ft (487 m) + 48 ft (15 m) = 1648 ft (502 m)
6. Locate the junction boxes for the RaySol heating cable system
The heating cable connects to the branch circuit wiring in a junction box with the
RaySol FTC-P power connection and end seal kit.
The junction boxes may be distributed around the area to be heated, or collected at
a single location. In many applications, the heating cable can be laid out so that all
power connections and end seals can be grouped in a common area without using
extra heating cable. If this can be done, select the common junction box location to
minimize the electrical conduit and wire needed to reach the branch circuit breakers.
Refer to Fig. 14 on page 276 for examples of typical layouts of cable attached to the
bottom of concrete floors.
7. Lay out the heating cable runs, circuits, and junction boxes
After determining the estimated total heating cable length, the number of circuits,
and the junction box location, do a trial layout. In making the trial layout, follow these
recommendations:
• Start and end each circuit in a junction box. The power connection and end seal
may be located in the same box or in different boxes.
• Arrange the heating cable run so it uniformly covers the area to be heated.
• Maintain the design heating cable spacing within 1 in (2.5 cm).
• Do not route the heating cable closer than 4 in (10 cm) to the edge of the subfloor,
drains, anchors, or other material in the concrete.

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• Do not exceed the maximum length of heating cable allowed on a branch circuit
breaker as given in Table 5.

8. Record the circuit information
Reconfigure the trial circuit layout until the design meets all of the previous
recommendations. Assign each circuit to a circuit breaker in a specific panel board
and record each circuit length.
Advance to Step 5, page 298.

Roof and Gutter
De-Icing

Comfort Floor Heating

Fire Sprinkler System
Freeze Protection

• When the combined lengths of two or more circuit runs are less than the maximum circuit length allowed, these runs can be combined in parallel on one circuit
breaker.

Pipe Freeze Protection
and Flow Maintenance

Floor Heating Application Design

Design a RaySol heating cable system for comfort floor heating as follows:
1. Select the appropriate RaySol heating cable
Select the heating cable based on the operating voltage (see Table 3 on page 275).
For 120 V, select RaySol-1; for 208–277 V, select RaySol-2.
Example: RaySol heating cables for comfort floor heating
208 V (from Step 3)

Catalog number

RaySol-2

2. Determine the RaySol heating cable spacing
Use the minimum ambient design temperature and the floor insulation R-value
(from Step 3) to select the correct spacing shown in Table 7 for comfort floor heating.
If the calculated R-value or minimum design temperature does not match the values
in the table, use the values that give the closer spacing.

Surface Snow
Melting – MI

Supply voltage

Table 7 RaySol Heating Cable Spacing for Comfort Floor Heating
Surface Snow
Melting – ElectroMelt

Minimum ambient
design temperature

Floor insulation R-value (ft2·°F·hr/Btu)
R-10

R-20

R-30

R-40

50°F

(10°C)

8 in (20 cm)

9 in (23 cm)

30°F

(–1°C)

7 in (18 cm)

8 in (20 cm)

10°F

(–12°C)

7 in (18 cm)

8 in (20 cm)

–10°F

(–23°C)

6 in (15 cm)

7 in (18 cm)

8 in (20 cm)

–30°F

(–34°C)

6 in (15 cm)

7 in (18 cm)

If the space below the floor is maintained at more than 50°F (10°C), insulate the floor
to R-10 minimum and select heating cable spacing from the 50°F (10°C) row in
Table 7.

Freezer Frost
Heave Prevention

For on-grade installations use heating cable on 9 in (23 cm) centers.

Example: RaySol heating cables for comfort floor heating
Minimum ambient design temperature 10°F (–23°C) (from Step 3)
R-30 (from Step 3)

Heating cable spacing

8 in (20 cm)

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Floor Heating

THERMAL MANAGEMENT SOLUTIONS

Insulation R-value

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
3. Determine the RaySol heating cable layout and length
Estimate the heating cable length The length of heating cable and the number of
heating cable circuits can be estimated before a detailed layout is done if the heating
cable spacing, total heated area, and the available branch circuit breaker rating are
known.
Estimate the heating cable length required:
Estimated heating cable length (ft) =

Heated area (ft2) x 12
Spacing (in)

Estimated heating cable length (m) =

Heated area (m2) x 100
Spacing (cm)

Side A
34 ft (10.4 m)

Side B

20 ft (6.1 m)

Junction boxes

Fig. 16 RaySol heating cable layout for comfort floor heating

Example: RaySol heating cable length for comfort floor heating
Heated area

647 ft2 (60.4 m2) (from Step 3)

Estimated heating cable length

647 ft2 x 12 / 8 in = 971 ft

60.4 m2 x 100 / 20 cm = 302 m

4. Determine the maximum circuit length for the heating cable length and layout
For the appropriate supply voltage, use Table 8 to select the maximum circuit length
which is closest to, but greater than the length calculated. If the estimated heating
cable length required is greater than the maximum circuit length, multiple circuits
must be used.
Table 8 Maximum RaySol Circuit Length in Feet (Meters) When
Embedded in Concrete or Mortar (40°F (4°C) Start-up)*
Supply voltage

120 V

208 V

240 V

277 V

Circuit breaker size
(A)

24.4

135

41.1

140

42.7

145

44.2

105

32.0

185

56.4

185

56.4

195

59.4

160

48.8

275

83.8

280

85.3

290

88.4

170

51.8

280

85.3

320

97.5

360

109.7

* For start-up temperatures less than 40°F, contact your Pentair Thermal Management representative.

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Note: If RaySol is installed in a bathroom, a 5 mA GFCI breaker must be used. In
this case, the circuit breaker size cannot exceed 30 A.

Pipe Freeze Protection
and Flow Maintenance

Floor Heating Application Design

Calculate the estimated number of circuits as follows:
=

Fire Sprinkler System
Freeze Protection

Number of circuits

Estimated heating cable length (ft/m)
Maximum circuit length (ft/m)

Round the number of circuits to the next larger whole number.
Example: RaySol heating cable length for comfort floor heating
971 ft (302 m) (from earlier in this step)

Supply voltage

208 V (Step 3)

Maximum circuit length

275 ft (83.8 m) (from Table 8)

Roof and Gutter
De-Icing

Estimated heating cable length

Number of circuits
971 ft / 275 ft (302 m / 83.8 m)
= 4 circuits (rounded)
Power supply

Four 30 A circuit breakers (from Table 8)

5. Determine the additional heating cable allowances

Surface Snow
Melting – MI

Additional heating cable is required to make power connections and to route the
circuits to junction boxes. This extra heating cable shall not be considered when
determining the maximum heating cable length for circuit breaker sizing. In order to
estimate the total heating cable length, you will need to take the estimated heating
cable length you already calculated, and then add heating cable allowances, as
follows:
Estimated total heating cable length = Estimated heating cable length + End allowances + Connection kit allowances

Refer to Table 6 on page 278 to calculate the additional RaySol heating cable
allowances.

Estimated heating cable length

971 ft (302 m) (from earlier in this step)

End allowance
4 circuits x 4 ft per end x 2 ends = 32 ft (10 m)

(from Table 6)
Connection kit allowances
4 connection kits x 4 ft per end = 16 ft (5 m)

(from Table 6)
32 ft (10 m) + 16 ft (5 m) = 48 ft (15 m)

Estimated total heating cable length

971 ft (302 m) + 48 ft (15 m) = 1019 ft (317 m)

6. Locate the junction boxes for RaySol heating cable system
The heating cable connects to the branch circuit wiring in a junction box with the
RaySol FTC-XC power connection and end seal kit.

Fig. 17 illustrates the proper method to route the RaySol heating cable from the
mortar bed up to the junction box using protective conduit.

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Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating

The junction boxes may be distributed around the area to be heated, or collected at
a single location. In many applications the heating cable can be laid out so that all
power connections and end seals can be grouped in a common area without using
extra heating cable. If this can be done, select the common junction box location to
minimize the electrical conduit and wire needed to reach the branch circuit breakers.
Typical heating cable layout for comfort floor heating is similar to the examples
shown in Fig. 14 on page 276 for heat loss replacement.

Freezer Frost
Heave Prevention

Total heating cable allowances

Surface Snow
Melting – ElectroMelt

Example: RaySol heating cable for comfort floor heating

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS

Junction box

3/4" (min) conduit
Heating cable
Mortar
Subfloor
Insulation
6"

Fig. 17 Typical RaySol comfort floor heating installation

7. Lay out heating cable runs, circuits, and junction boxes
After determining the approximate total length of heating cable, the number of
circuits, and the junction box location, do a trial layout. In making the trial layout,
follow these recommendations:
• Start and end each circuit in a junction box. The power connection and end seal
may be located in the same box or in different boxes.
• Arrange the heating cable run so it uniformly covers the area to be heated.
• Maintain the design heating cable spacing within 1 in (2.5 cm).
• Do not extend the heating cable beyond the room or area in which it originates.
• Do not install cables under shower floors, tubs and spas, toilets and other permanent fixtures.
• Do not cross expansion, crack control, or other subfloor joints.
• Do not route the heating cable closer than 4 in (10 cm) to the edge of the subfloor,
drains, anchors, or other material in the concrete.
• Do not exceed the maximum length of heating cable allowed on a branch circuit
breaker as given in Table 8.
• When the combined lengths of two or more circuit runs are less than the maximum circuit length allowed, these runs can be combined in parallel on one circuit
breaker.
8. Record the circuit information
Reconfigure the trial circuit layout until the design meets all of the previous
recommendations. Assign each circuit to a circuit breaker in a specific panel board
and record each circuit length.
Advance to Step 5, page 298.

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MI Heating Cable System Design

Designing the floor heating system using a three-phase voltage supply has the
added advantages of fewer circuits, reduced distribution costs, and a balanced
heating system load and is recommended for large areas.

Roof and Gutter
De-Icing

Three-phase voltage supplies include 208/120 V, 480/277 V, and 600/347 V. The
heating cables may be connected in delta or wye configuration as shown in Fig. 24
on page 309 and Fig. 25 on page 310. If the heating cables are connected in the
delta configuration, select the cables based on the phase-to-phase voltage (example:
select 208 V cables for a 208 V supply). If the heating cables are connected in the wye
configuration, select the cables based on the phase-to-neutral voltage (example:
select 120 V cables for a 208 V supply).

Fire Sprinkler System
Freeze Protection

A single heating cable may be sufficient for small floor areas. For large floor areas,
it may be necessary to divide the area into two or more equal subsections (Fig. 19 on
page 288). For a three-phase voltage supply, divide the total area into three equal
subsections (Fig. 18 on page 285) or a multiple of three equal subsections when
more than one circuit is necessary. If expansion joints will be used in the floor, divide
the area so that the heating cables will not cross any expansion joints.

Pipe Freeze Protection
and Flow Maintenance

Floor Heating Application Design

Heat Loss Replacement
Select the Heating Cable
Surface Snow
Melting – MI

Table 9 lists the heat loss for minimum design temperature and insulation R-value
determined in Step 3. Select your design power from this table. If your calculated
R-value or minimum design temperature does not match the values in the table, use
the values that give the higher design power.
Table 9 Design Power Based on 70°F (21°C) Control
Floor insulation R-value (ft2 ·°F·hr/Btu)
R-10

R-20

R-30

R-40

Design power - W/ft2 (W/m2)
2.2 (23.7)

1.6 (17.2)

1.4 (15.1)

1.3 (14.0)

20°F (–7°C)

2.5 (26.9)

1.8 (19.4)

1.5 (16.1)

1.4 (15.1)

10°F (–12°C)

2.8 (30.1)

1.9 (20.4)

1.6 (17.2)

1.5 (16.1)

0°F (–18°C)

3.0 (32.3)

2.0 (21.5)

1.7 (18.3)

1.5 (16.1)

–10°F (–23°C)

3.3 (35.5)

2.2 (23.7)

1.8 (19.4)

1.6 (17.2)

–20°F (–29°C)

3.6 (38.7)

2.3 (24.7)

1.9 (20.4)

1.7 (18.3)

–30°F (–34°C)

3.9 (42.0)

2.5 (26.9)

2.0 (21.5)

1.7 (18.3)

–40°F (–40°C)

4.1 (44.1)

2.6 (28.0)

2.1 (22.6)

1.8 (19.4)

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Floor Heating

The heating cables shown in Table 10 have been optimized for heat loss replacement
applications. They are manufactured with a bare copper sheath and are designed
to be attached to the bottom of the concrete floor. Do not use these heating cables
for embedded applications. If assistance is required to select heating cables
for embedded heat loss replacement applications, irregular shaped areas, or
applications outside the scope of this design guide, contact your Pentair Thermal
Management representative or Pentair Thermal Management at (800) 545-6258 for
design assistance.

Freezer Frost
Heave Prevention

30°F (–1°C)

Surface Snow
Melting – ElectroMelt

Minimum design
temperature

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
Single-phase supply
Small floor areas require only one heating cable. Large floor areas may require two
or more heating cables.
• Divide large floor areas into equal subsection areas, if possible (see Fig. 19 on
page 288).
• Calculate the power required for the total area (small floor areas) or for each
subsection area (large floor areas) by multiplying the design power (from Table 9)
by the total area or subsection area.
Power required = Design power x Total area (or Subsection area)
Simply select the heating cable from Table 10 on page 286 based on the total area
or subsection area. Under the appropriate voltage, make sure that the total area
or subsection area falls within the minimum and maximum range of the “Area
coverage” columns and verify that the “Cable wattage” shown directly across from
the “Area coverage” is equal to or higher than the calculated “Power required” for
the total area or subsection area.
In cases where the floor area has been divided into equal subsections, select the
appropriate number of heating cables.
Note: Several heating cables in Table 10 may satisfy the requirements. Selecting
one cable over another will simply result in a higher or lower watt density or different
cable spacing. It may be desirable to select the lowest wattage cable that satisfies
the area coverage to reduce the breaker size, or a longer cable to reduce cable
spacing. Reduced cable spacing will provide a more uniform floor temperature.
Three-phase supply
Since a balanced three-phase system requires three cables, each cable will occupy
1/3 of the floor area when installed.
• Divide the total heated floor area into three equal subsections (Fig. 18) or a
multiple of three equal subsections when more than one circuit is necessary.
• Calculate the power required for each subsection by multiplying the design power
(from Table 9) by the subsection area.
Power required = Design power x Subsection area
Simply select the heating cable from Table 10 on page 286 based on the subsection
area. Under the appropriate voltage, make sure that the subsection area falls within
the minimum and maximum range of the “Area coverage” column and verify that the
“Cable wattage” shown directly across from the “Area coverage” is equal to or higher
than the calculated “Power required” for the subsection area.
Select the appropriate number of heating cables equal to the number of subsection
areas (multiples of three cables required).
Note: Several heating cables in Table 10 may satisfy the requirements. Selecting
one cable over another will simply result in a higher or lower watt density or different
cable spacing. It may be desirable to select the lowest wattage cable that satisfies
the area coverage to reduce the breaker size, or a longer cable to reduce cable
spacing. Reduced cable spacing will provide a more uniform floor temperature.

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3-phase
supply

Junction box

Fire Sprinkler System
Freeze Protection

40 ft (12.2 m)

26.7 ft (8.1 m)

Roof and Gutter
De-Icing

26.7 ft (8.1 m)

Pipe Freeze Protection
and Flow Maintenance

Floor Heating Application Design

26.7 ft (8.1 m)

Fig. 18 Typical three-phase heating cable layout for heat loss replacement

Example: MI heating cables for heat loss replacement
3200 ft2 (297.4 m2) (from Step 3)

Supply voltage and phase

208 V, three-phase (from Step 3)

Surface Snow
Melting – MI

Heated area

Minimum ambient design temperature –10°F (–23°C) (from Step 3)
R-20 (20 ft2·°F·hr/Btu) (from Step 3)

Design power

2.2 W/ft2 (23.7 W/m2) (from Table 9)

Subsection area

3200 ft2 / 3 = 1067 ft2 (see Fig. 18)
297.4 m2 / 3 = 99.1 m2

Power required (for each subsection)

(Design power x Subsection area) =
2.2 W/ft2 x 1067 ft2 = 2347 W
23.7 W/m2 x 99.1 m2 = 2347 W

Heating cable catalog number

HLR24 (from Table 10)

Cable wattage

5150 W (from Table 10)

Cable voltage

208 V (for cables connected in Delta
configuration)

Heating cable length

420 ft (128.0 m) (from Table 10)

Number of cables

3 (one cable required for each subsection)

Surface Snow
Melting – ElectroMelt

Insulation R-value

Freezer Frost
Heave Prevention
Floor Heating

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Sheets

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Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
Table 10 Selection Table for Heat Loss Replacement
Area coverage
Catalog
number

Min
(ft2)

Max
(ft2)

Min
(m2)

Heated length
Max
(m2)

Cable wattage
(W)

(ft)

(m)

Heating cable current
(A)

120 V and 208 V, three-phase Wye
HLR1

330

21.3

2.8

HLR2
HLR3
HLR4
HLR5
HLR6
HLR7
HLR8
HLR9
HLR10
HLR11
HLR12
HLR13

89
112
127
156
180
216
246
286
349
404
492
654

132
165
189
231
267
318
366
420
516
594
732
966

8
10
12
14
17
20
23
27
32
38
46
61

12
15
18
21
25
30
34
39
48
55
68
90

540
670
760
935
1080
1295
1475
1715
2100
2425
2950
3925

44
55
63
77
89
106
122
140
172
198
244
322

13.4
16.8
19.2
23.5
27.1
32.3
37.2
42.7
52.4
60.4
74.4
98.2

4.5
5.6
6.3
7.8
9.0
10.8
12.3
14.3
17.5
20.2
24.6
32.7

156
195
221
271
312
373
427
495
609
697
858
1129

228
285
327
399
462
552
633
729
888
1035
1260
1680

14
18
20
25
29
35
40
46
57
65
80
105

21
26
30
37
43
51
59
68
83
96
117
156

935
1170
1325
1625
1875
2240
2565
2970
3655
4180
5150
6780

76
95
109
133
154
184
211
243
296
345
420
560

23.2
29.0
33.2
40.5
47.0
56.1
64.3
74.1
90.2
105.2
128.0
170.7

4.5
5.6
6.4
7.8
9.0
10.8
12.3
14.3
17.6
20.1
24.8
32.6

179
224
256
314
362
431
494
571
696
810
990
1316

264
330
375
459
531
636
729
840
1035
1185
1455
1920

17
21
24
29
34
40
46
53
65
75
92
122

25
31
35
43
49
59
68
78
96
110
135
178

1075
1345
1535
1880
2170
2590
2965
3430
4175
4860
5940
7900

88
110
125
153
177
212
243
280
345
395
485
640

26.8
33.5
38.1
46.6
54.0
64.6
74.1
85.4
105.2
120.4
147.9
195.1

4.5
5.6
6.4
7.8
9.0
10.8
12.4
14.3
17.4
20.3
24.8
32.9

208 V
HLR14
HLR15
HLR16
HLR17
HLR18
HLR19
HLR20
HLR21
HLR22
HLR23
HLR24
HLR25

240 V
HLR26
HLR27
HLR28
HLR29
HLR30
HLR31
HLR32
HLR33
HLR34
HLR35
HLR36
HLR37

Note: Type HLR cables supplied with 15 ft (4.6 m) long cold lead
Heating cable length tolerance is –0% to +3%.

286

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THERMAL MANAGEMENT SOLUTIONS

Table 10 Selection Table for Heat Loss Replacement
Area coverage
Min
(ft2)

Max
(ft2)

Min
(m2)

Max
(m2)

Cable wattage
(W)

(ft)

(m)

Heating cable current
(A)

277 V and 480 V, three-phase wye
206
258
294
361
416
497
571
656
807
927
1142
1516

306
381
435
531
615
735
840
975
1188
1380
1680
2220

19
24
27
34
39
46
53
61
75
86
106
141

28
35
40
49
57
68
78
91
110
128
156
206

1235
1550
1765
2170
2495
2985
3425
3935
4845
5560
6850
9100

102
127
145
177
205
245
280
325
396
460
560
740

31.1
38.7
44.2
54.0
62.5
74.7
85.4
99.1
120.7
140.2
170.7
225.6

4.5
5.6
6.4
7.8
9.0
10.8
12.4
14.2
17.5
20.1
24.7
32.9

Roof and Gutter
De-Icing

HLR38
HLR39
HLR40
HLR41
HLR42
HLR43
HLR44
HLR45
HLR46
HLR47
HLR48
HLR49

Fire Sprinkler System
Freeze Protection

Catalog
number

Heated length

Pipe Freeze Protection
and Flow Maintenance

Floor Heating Application Design

347 V and 600 V, three-phase wye
381
480
546
666
774
918
1050
1215
1485
1725
2100

24
30
34
42
48
58
67
77
94
108
133

35
45
51
62
72
85
98
113
138
160
195

1560
1930
2205
2715
3110
3750
4300
4955
6080
6980
8600

127
160
182
222
258
306
350
405
495
575
700

38.7
48.8
55.5
67.7
78.7
93.3
106.7
123.5
150.9
175.3
213.4

4.5
5.6
6.4
7.8
9.0
10.8
12.4
14.3
17.5
20.1
24.8

360
448
512
627
721
863
990
1143
1391

525
660
750
918
1065
1272
1455
1680
2070

33
42
48
58
67
80
92
106
129

49
61
70
85
99
118
135
156
192

2160
2685
3070
3770
4330
5175
5940
6860
8350

175
220
250
306
355
424
485
560
690

53.4
67.1
76.2
93.3
108.2
129.3
147.9
170.7
210.4

4.5
5.6
6.4
7.9
9.0
10.8
12.4
14.3
17.4

447
559
639
781
903
1078
1240
1429

660
825
939
1152
1329
1590
1815
2100

42
52
59
73
84
100
115
133

61
77
87
107
124
148
169
195

2685
3360
3835
4690
5420
6470
7440
8570

220
275
313
384
443
530
605
700

67.1
83.8
95.4
117.1
135.1
161.6
184.5
213.4

4.5
5.6
6.4
7.8
9.0
10.8
12.4
14.3

Surface Snow
Melting – ElectroMelt

259
322
368
452
519
625
717
826
1014
1163
1433

Surface Snow
Melting – MI

HLR50
HLR51
HLR52
HLR53
HLR54
HLR55
HLR56
HLR57
HLR58
HLR59
HLR60

480 V

Freezer Frost
Heave Prevention

HLR61
HLR62
HLR63
HLR64
HLR65
HLR66
HLR67
HLR68
HLR69

600 V

Floor Heating

HLR70
HLR71
HLR72
HLR73
HLR74
HLR75
HLR76
HLR77

Note: Type HLR cables supplied with 15 ft (4.6 m) long cold lead
Heating cable length tolerance is –0% to +3%.

Advance to "Determine the heating cable spacing" on page 293.

EN-FloorHeatingSystem-DG-H58157

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287

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
Comfort Floor Heating
The heating cables shown in Table 12 have been optimized for comfort floor heating
applications. If assistance is required to select heating cables for irregular shaped
areas, or applications outside the scope of this design guide, contact your Pentair
Thermal Management representative or Pentair Thermal Management at
(800) 545-6258 for design assistance.
Single-phase supply
Small floor areas require only one heating cable. Large floor areas may require two
or more heating cables.
• Divide large floor areas into equal subsection areas, if possible (Fig. 19).
Simply select the heating cable from Table 11 or Table 12 based on the total area
or subsection area. Under the appropriate voltage, make sure that the total area
or subsection area falls within the minimum and maximum range of the “Area
coverage” column.
In cases where the heated floor area has been divided into equal subsections, select
the appropriate number of heating cables.
Note: Several heating cables in Table 11 may satisfy the requirements. Selecting
one cable over another will simply result in a higher or lower watt density or different
cable spacing. It may be desirable to select the lowest wattage cable that satisfies
the area coverage to reduce the breaker size, or a longer cable to reduce cable
spacing. Reduced cable spacing will provide a more uniform floor temperature.
17.8 ft (5.43 m)

Subsection 1

Subsection 2

20 ft (6.1 m)

16.2 ft (4.94 m)

Junction
box

Fig. 19 Typical heating cable layout for comfort floor heating

Note: In Fig. 19, the subsections are equal heated areas.
Example: MI heating cables for comfort floor heating

288

Heated area

647 ft2 (60.4 m2) (from Step 3)

Supply voltage and phase

208 V, single-phase (from Step 3)

Subsection area

647 ft2 / 2 = 324 ft2 (see Fig. 19)
60.4 m2 / 2 = 30.2 m2

Heating cable catalog number

FH21 (from Table 12)

Cable wattage

3390 W (from Table 12)

Cable voltage

208 V (from Table 12)

Heating cable length

425 ft (129.6 m) (from Table 12)

Number of cables

2 (one cable required for each subsection)

EN-FloorHeatingSystem-DG-H58157

11/13

THERMAL MANAGEMENT SOLUTIONS

Three-phase supply
Since a balanced three-phase system requires three cables, each cable will occupy
1/3 of the heated floor area when installed.

Simply select the heating cable from Table 11 or Table 12 based on the subsection
area. Under the appropriate voltage, make sure that the subsection area falls within
the minimum and maximum range of the “Area coverage” column.
Select the appropriate number of heating cables equal to the number of subsection
areas (multiples of three cables required).

Roof and Gutter
De-Icing

Note: Several heating cables in Table 11 may satisfy the requirements. Selecting
one cable over another will simply result in a higher or lower watt density or different
cable spacing. It may be desirable to select the lowest wattage cable that satisfies
the area coverage to reduce the breaker size, or a longer cable to reduce cable
spacing. Reduced cable spacing will provide a more uniform floor temperature.

Fire Sprinkler System
Freeze Protection

• Divide the total heated floor area into three equal subsections or a multiple of
three equal subsections when more than one circuit is necessary.

Pipe Freeze Protection
and Flow Maintenance

Floor Heating Application Design

Table 11 Selection Table for Comfort Floor Heating
Area coverage
Min
(ft2)

Max
(ft2)

Heated length

Min
(m2)

Max
(m2)

Cable wattage
(W)

(ft)

(m)

Heating cable current
(A)

120 V and 208 V, three-phase wye
42

2.8

3.9

425

16.8

3.5

4.0

5.9

500

140

42.7

4.2

SUA4

4.2

4.7

550

20.7

4.6

SUA7

5.9

6.6

750

29.0

6.3

SUA8

6.0

9.0

800

177

54.0

6.7

SUB1

100

8.0

9.3

1000

132

40.2

8.3

SUB2

125

7.7

11.6

1000

240

73.2

8.3

SUB3

107

160

10.0

14.9

1300

280

85.4

10.8

SUB4

125

187

11.6

17.4

1500

320

97.6

12.5

SUB5

154

195

14.3

18.1

1800

260

79.3

15.0

SUB6

160

240

14.9

22.3

1900

375

114.3

15.8

SUB7

194

235

18.0

21.8

2300

310

94.5

19.2

SUB8

191

287

17.8

26.7

2300

550

167.7

19.2

SUB9

257

385

23.9

35.8

3000

630

192.1

25.0

SUB10

359

538

33.4

50.0

4300

717

218.6

35.8

Freezer Frost
Heave Prevention

SUA3

Surface Snow
Melting – ElectroMelt

SUA2

208 V
SUA1

4.6

7.5

650

108

32.9

3.1

SUA6

130

198

12.1

18.4

1560

264

80.5

7.5

SUB19

110

6.9

10.2

885

245

74.7

4.3

SUB20

101

152

9.4

14.1

1210

340

103.7

5.8

SUB21

137

205

12.7

19.1

1640

440

134.1

7.9

SUB22

160

256

14.9

23.8

2060

525

160.1

9.9

6.5

7.5

900

108

32.9

3.8

SUA6

175

198

16.3

18.4

2100

264

80.5

8.8

SUB19

146

9.1

13.6

1175

245

74.7

4.9

SUB20

135

202

12.5

18.8

1615

340

103.7

6.7

SUB21

182

274

16.9

25.5

2180

440

134.1

9.1

SUB22

229

345

21.3

32.1

2745

525

160.1

11.4

Floor Heating

240 V
SUA1

EN-FloorHeatingSystem-DG-H58157

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289

Technical Data
Sheets

Note: Type SUA cables supplied with 7 ft (2.1 m) foot long cold lead: type SUB cables supplied with 15.1 (4.8 m) long cold lead.
Heating cable length tolerance is –0% to +3%.

THERMAL MANAGEMENT SOLUTIONS

Surface Snow
Melting – MI

Catalog
number

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
Table 11 Selection Table for Comfort Floor Heating
Area coverage
Catalog
number

Min
(ft2)

Max
(ft2)

Min
(m2)

Heated length
Max
(m2)

Cable wattage
(W)

(ft)

(m)

Heating cable current
(A)
5.6

277 V (and 480 V, three-phase wye)
SUB19

130

184

12.1

17.1

1565

245

74.7

SUB20

179

255

16.6

23.7

2150

340

103.7

7.8

SUB21

242

330

22.5

30.7

2900

440

134.1

10.5

SUB22

304

394

28.3

36.6

3650

525

160.1

13.2

347 V and 600 V, three-phase wye
SUB11

114

169

10.6

15.7

1400

225

68.6

4.0

SUB12

162

233

21.6

1950

310

94.5

5.6

SUB13

223

321

20.8

29.8

2700

428

130.5

7.8

SUB14

305

411

28.3

38.2

3700

548

167.1

10.7

Note: Type SUA cables supplied with 7 ft (2.1 m) foot long cold lead: type SUB cables supplied with 15.1 (4.8 m) long cold lead.
Heating cable length tolerance is –0% to +3%.

Table 12 Selection Table for Comfort Floor Heating
Area coverage
Catalog
number

Min
(ft2)

Max
(ft2)

Heated length

Min
(m2)

Max
(m2)

Cable wattage
(W)

(ft)

(m)

Heating cable current
(A)

120 V and 208 V, three-phase wye
FH1

3.4

3.8

440

16.5

3.7

FH2

3.9

4.7

545

20.7

4.5

FH3

4.8

5.4

625

23.5

5.2

FH4

5.5

6.6

760

29.0

6.3

FH5

6.7

7.6

880

109

33.2

7.3

FH6

7.7

9.1

1055

130

39.6

8.8

FH7

113

9.2

10.5

1200

150

45.7

10.0

FH8

114

130

10.6

12.1

1390

173

52.7

11.6

FH9

131

158

12.2

14.6

1715

210

64.0

14.3

FH10

159

185

14.8

17.2

1960

245

74.7

16.3

FH11

186

230

17.3

21.4

2400

300

91.5

20.0

FH12

5.6

6.7

755

28.7

3.6

FH13

6.8

8.2

940

118

36.0

4.5

FH14

101

8.3

9.3

1075

134

40.9

5.2

FH15

102

123

9.5

11.4

1320

164

50.0

6.3

FH16

124

143

11.5

13.2

1520

190

57.9

7.3

FH17

144

169

13.4

15.7

1830

225

68.6

8.8

FH18

170

195

15.8

18.1

2080

260

79.3

10.0

FH19

196

230

18.2

21.4

2400

300

91.5

11.5

FH20

231

274

21.5

25.4

2960

365

111.3

14.2

FH21

275

325

25.6

30.2

3390

425

129.6

16.3

FH22

326

390

30.3

36.2

4160

520

158.5

20.0

208 V

Note: Type FH cables supplied with 15 ft (4.6 m) long cold lead.
Tolerance on heating cable length is –0% to +3%.

290

EN-FloorHeatingSystem-DG-H58157

11/13

THERMAL MANAGEMENT SOLUTIONS

Table 12 Selection Table for Comfort Floor Heating
Area coverage
Min
(ft2)

Max
(ft2)

Min
(m2)

Max
(m2)

Cable wattage
(W)

(ft)

(m)

Heating cable current
(A)

240 V
70

6.5

7.8

875

108

32.9

3.6

FH24

101

7.9

9.4

1095

135

41.2

4.6

FH25

102

119

9.5

11.1

1240

155

47.3

5.2

FH26

120

145

11.2

13.5

1515

190

57.9

6.3

FH27

146

164

13.6

15.2

1785

215

65.5

7.4

FH28

165

195

15.3

18.1

2110

260

79.3

8.8

FH29

196

225

18.2

20.9

2400

300

91.5

10.0

FH30

226

265

21.0

24.6

2780

345

105.2

11.6

FH31

266

320

24.7

29.7

3430

420

128.0

14.3

FH32

321

375

29.8

34.9

3920

490

149.4

16.3

FH33

376

450

34.9

41.8

4800

600

182.9

20.0

Roof and Gutter
De-Icing

FH23

Fire Sprinkler System
Freeze Protection

Catalog
number

Heated length

Pipe Freeze Protection
and Flow Maintenance

Floor Heating Application Design

277 V and 480 V, three-phase wye
97

7.4

9.0

1005

125

38.1

3.6

FH35

119

9.1

11.0

1270

155

47.3

4.6

FH36

120

135

11.1

12.5

1440

178

54.3

5.2

FH37

136

165

12.6

15.3

1760

218

66.5

6.4

FH38

166

195

15.4

18.1

2020

253

77.1

7.3

FH39

196

225

18.2

20.9

2435

300

91.5

8.8

FH40

226

260

21.0

24.2

2780

345

105.2

10.0

FH41

261

310

24.3

28.8

3200

400

122.0

11.6

FH42

311

370

28.9

34.4

3915

490

149.4

14.1

FH43

371

435

34.5

40.4

4535

564

172.0

16.4

FH44

436

518

40.5

48.1

5560

690

210.4

20.1

Surface Snow
Melting – ElectroMelt

Surface Snow
Melting – MI

FH34

347 V and 600 V, three-phase wye
100

120

9.3

11.2

1275

155

47.3

3.7

FH46

121

150

11.2

13.9

1585

195

59.5

4.6

FH47

151

170

14.0

15.8

1825

220

67.1

5.3

FH48

171

205

15.9

19.1

2230

270

82.3

6.4

FH49

206

240

19.1

22.3

2550

315

96.0

7.3

FH50

241

285

22.4

26.5

3050

376

114.6

8.8

FH51

286

330

26.6

30.7

3500

430

131.1

10.1

FH52

331

380

30.8

35.3

4040

497

151.5

11.6

FH53

381

465

35.4

43.2

4935

610

186.0

14.2

FH54

466

533

43.3

49.5

5650

710

216.5

16.3

FH55

140

167

13.0

15.5

1760

215

65.5

3.7

FH56

168

205

15.6

19.1

2190

270

82.3

4.6

FH57

206

235

19.2

21.8

2480

310

94.5

5.2

FH58

236

285

21.9

26.5

3030

380

115.9

6.3

FH59

286

335

26.6

31.1

3530

435

132.6

7.4

FH60

336

395

31.2

36.7

4220

520

158.5

8.8

FH61
FH62

396

455

36.8

42.3

4800

600

182.9

10.0

456

518

42.4

48.1

5565

690

210.4

11.6

Freezer Frost
Heave Prevention

FH45

480 V

Floor Heating

Note: Type FH cables supplied with 15 ft (4.6 m) long cold lead.
Tolerance on heating cable length is –0% to +3%.

EN-FloorHeatingSystem-DG-H58157

11/13

291

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
Table 12 Selection Table for Comfort Floor Heating
Area coverage
Catalog
number

Heated length

Min
(ft2)

Max
(ft2)

Min
(m2)

Max
(m2)

Cable wattage
(W)

(ft)

FH63

170

210

15.8

19.5

2185

FH64

211

255

19.6

23.7

2715

FH65

256

295

23.8

27.4

FH66

296

360

27.5

33.5

FH67

361

420

33.6

FH68

421

488

39.1

(m)

Heating cable current
(A)

270

82.3

3.6

340

103.7

4.5

3120

385

117.4

5.2

3830

470

143.3

6.4

39.0

4400

545

166.2

7.3

45.3

5275

650

198.2

8.8

600 V

Note: Type FH cables supplied with 15 ft (4.6 m) long cold lead.
Tolerance on heating cable length is –0% to +3%.

Advance to "Determine the heating cable spacing" on page 293.
Radiant Space Heating
For radiant space heating, the total heat loss in Btu/hr or wattage is supplied by the
customer. Heating cables can be selected for single phase or three-phase voltage
supplies as shown for comfort floor heating, but based on the heat loss in watts
required for each area. Use Table 11 or Table 12 to select a heating cable from the
“Cable wattage” column that is equal to or the next highest wattage than the wattage
specified.
10.8 ft (3.3 m)

12.4 ft (3.8 m)

Subsection 1

Subsection 2

Subsection 3

Junction box

20 ft (6.1 m)

10.8 ft (3.3 m)

Junction box

Fig. 20 Typical heating cable layout for radiant space heating

Note: In Fig. 20, the subsections are equal heated areas.

292

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THERMAL MANAGEMENT SOLUTIONS

Example: MI heating cables for radiant space heating
Supply voltage and phase

208 V, single phase (from Step 3)

Subsection area

647 ft2 / 3 = 216 ft2
60.4 m2 / 3 = 20.1 m2

Btu requirement

34,800 Btu/hr (from Step 3)

Power required

34,800 Btu/hr / 3.412 = 10200 W

Power per subsection

10200 W / 3 = 3400 W

Heating cable catalog number

FH21 (from Table 12)

Cable wattage

3390 W

Cable voltage

208 V (from Table 12)

Heating cable length

425 ft (129.6 m) (from Table 12)

Number of cables

3 (one heating cable per subsection)

Roof and Gutter
De-Icing

647 ft2 (60.4 m2) (from Step 3)

Fire Sprinkler System
Freeze Protection

Heated area

Pipe Freeze Protection
and Flow Maintenance

Floor Heating Application Design

Note: Divide Btu/hr by 3.412 to convert to watts.
Advance to "Determine the heating cable spacing" following.
Determine the heating cable spacing

For heat loss replacement, the heated area in the equation following is the total floor
area. For comfort floor heating and radiant space heating, the heated area does not
include the space occupied by tubs and spas, toilets, cabinets, and other permanent
fixtures. This heated floor area was determined in Step 3.
Heated area (ft2) x 12 in
Heating cable length (ft)

Cable spacing (cm) =

Heated area (m2) x 100 cm
Heating cable length (m)

Round to the nearest 1/2 in or nearest 1 cm to obtain cable spacing.

Example: MI heating cables for heat loss replacement
1067 ft2 (99.1 m2)

Heating cable catalog number

HLR24 (from Table 10)

Heating cable length

420 ft (128.0 m) (from Table 10)

Cable spacing

(1067 ft2 x 12 in) / 420 ft = 30.5 in
Rounded to 31 in

(99.1 m2 x 100 cm) / 128.0 m = 77.4 cm
Rounded to 77 cm

11/13

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Technical Data
Sheets

EN-FloorHeatingSystem-DG-H58157

Floor Heating

THERMAL MANAGEMENT SOLUTIONS

Subsection area

Freezer Frost
Heave Prevention

Note: If a large area has been divided into subsections or if a three-phase
voltage supply is used, the heated area in the above equations will be the subsection
area and the heating cable length will be the length of the cable selected for the
subsection.

Surface Snow
Melting – ElectroMelt

Cable spacing (in) =

Surface Snow
Melting – MI

In this section you will determine the heating cable spacing for heat loss
replacement, comfort floor heating and radiant space heating.

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
Example: MI heating cables for comfort floor heating
Subsection area

324 ft2 (30.2 m2)

Heating cable catalog number

FH21 (from Table 12)

Heating cable length

425 ft (129.6 m) (from Table 12)

Cable spacing

(324 ft2 x 12 in) / 425 ft = 9.1 in
Rounded to 9 in

(30.2 m2 x 100 cm) / 129.6 m = 23.3 cm
Rounded to 23 cm

Example: MI heating cables for radiant space heating
Subsection area

216 ft2 (20.1 m2)

Heating cable catalog number

FH21 (from Table 12)

Heating cable length

425 ft (129.6 m) (from Table 12)

Cable spacing

(216 ft2 x 12 in) / 425 ft = 6.1 in
Rounded to 6 in

(20.1 m2 x 100 cm) / 129.6 m = 15.5 cm
Rounded to 15 cm

Advance to Step 5, page 298.

QuickNet Floor Heating system design
Comfort Floor Heating

The QuickNet floor heating mat system is the simplest surface floor heating product
to design. The mats are provided in predetermined sizes with the cable pre-spaced
for constant watt density. The available mat sizes are listed in Table 13.
Design a QuickNet floor heating system for comfort floor heating as follows:
1. Select the correct sized QuickNet heating mat
Select the QuickNet floor heating mat that is closest to, but no larger than the
heated area. The QuickStat-TC thermostat has built-in GFCI protection and can
be used with a standard circuit breaker to directly control 120-V heating mats in
areas up to 140 ft2 (13 m2) or 240-V heating mats in areas up to 280 ft2. For heated
areas greater than 140 ft2 (13 m2), select a standard 240-V QuickNet kit and a 240-V
QuickNet Extension kit. For heated areas greater than 280 ft2, multiple circuits and
the group control method (Fig. 23 on page 309) must be used. In this case, select a
standard 240-V QuickNet kit and appropriate number of 240-V QuickNet extension
kits that will come close to, but does not exceed the heated area.
Note: QuickNet 240-V floor heating mats can be powered by a 208-V power
supply. With the reduced power supply voltage, the power output will be reduced by
approximately 25%.
Example: QuickNet heating mats for comfort floor heating

294

Heated area

647 ft2 (60.4 m2) (from Step 3)

Supply voltage and phase

208 V, single-phase (from Step 3)

Required heating mats

50 ft2 (4.6 m2) x 1
80 ft2 (7.4 m2) x 1
100 ft2 (9.3 m2) x 5

Total heating mat area

630 ft2 (58.6 m2)

Heating mat quantities

QUICKNET-050-2 – Qty 1 (thermostat included)
QUICKNET-080X-2 – Qty 1
QUICKNET-100X-2 – Qty 5

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THERMAL MANAGEMENT SOLUTIONS

Table 13 Available QuickNet Heating Mat Sizes
Heated area
ft2
m2
Catalog number
Mat dimensions

Current (A)

Resistance
(Ohms)

120
180
240
300
360
420
480
540
600
720
840
960
1080
1200

1
1.5
2
2.5
3
3.5
4
4.5
5
6
7
8
9
10

120
80
60
48
40
35
30
27
24
20
17
15
13
12

600
720
960
1200

2.5
3
4
5

96
80
60
48

450
540
720
900

600
720
960
1200

2.5
3
4
5

96
80
60
48

Freezer Frost
Heave Prevention

450
540
720
900

Surface Snow
Melting – ElectroMelt

120
80
60
48
40
35
30
27
24
20
17
15
13
12

Surface Snow
Melting – MI

1
1.5
2
2.5
3
3.5
4
4.5
5
6
7
8
9
10

Roof and Gutter
De-Icing

120
180
240
300
360
420
480
540
600
720
840
960
1080
1200

Fire Sprinkler System
Freeze Protection

120 V QuickNet Standard Kit (with thermostat)
QUICKNET-010-1
10
0.9
20 in x 6.2 ft
QUICKNET-015-1
15
1.4
20 in x 9.2 ft
QUICKNET-020-1
20
1.9
20 in x 12.1 ft
QUICKNET-025-1
25
2.3
20 in x 15.1 ft
QUICKNET-030-1
30
2.8
20 in x 18.4 ft
QUICKNET-035-1
35
3.3
20 in x 21.3 ft
QUICKNET-040-1
40
3.7
20 in x 24.3 ft
QUICKNET-045-1
45
4.2
20 in x 27.5 ft
QUICKNET-050-1
50
4.6
20 in x 30.5 ft
QUICKNET-060-1
60
5.6
20 in x 36.4 ft
QUICKNET-070-1
70
6.5
20 in x 42.7 ft
QUICKNET-080-1
80
7.4
20 in x 48.9 ft
QUICKNET-090-1
90
8.4
20 in x 55 ft
QUICKNET-100-1
100
9.3
20 in x 61 ft
120 V Extension Kit (without thermostat)
QUICKNET-010X-1
10
0.9
20 in x 6.2 ft
QUICKNET-015X-1
15
1.4
20 in x 9.2 ft
QUICKNET-020X-1
20
1.9
20 in x 12.1 ft
QUICKNET-025X-1
25
2.3
20 in x 15.1 ft
QUICKNET-030X-1
30
2.8
20 in x 18.4 ft
QUICKNET-035X-1
35
3.3
20 in x 21.3 ft
QUICKNET-040X-1
40
3.7
20 in x 24.3 ft
QUICKNET-045X-1
45
4.2
20 in x 27.5 ft
QUICKNET-050X-1
50
4.6
20 in x 30.5 ft
QUICKNET-060X-1
60
5.6
20 in x 36.4 ft
QUICKNET-070X-1
70
6.5
20 in x 42.7 ft
QUICKNET-080X-1
80
7.4
20 in x 48.9 ft
QUICKNET-090X-1
90
8.4
20 in x 55 ft
QUICKNET-100X-1
100
9.3
20 in x 61 ft
208 V or 240 V QuickNet Standard Kit (with thermostat)
QUICKNET-050-2
50
4.6
20 in x 30.5 ft
QUICKNET-060-2
60
5.6
20 in x 36.4 ft
QUICKNET-080-2
80
7.4
20 in x 48.9 ft
QUICKNET-100-2
100
9.3
20 in x 61 ft
208 V or 240 V Extension Kit (without thermostat)
QUICKNET-050X-2
50
4.6
20 in x 30.5 ft
QUICKNET-060X-2
60
5.6
20 in x 36.4 ft
QUICKNET-080X-2
80
7.4
20 in x 48.9 ft
QUICKNET-100X-2
100
9.3
20 in x 61 ft

Power Output (W)
120 V 208 V 240 V

Pipe Freeze Protection
and Flow Maintenance

Floor Heating Application Design

2. Locate the junction box

3. Lay out the heating mat
Layout the mat according to your design, using as few turns as possible and
ensuring that the cold lead is near the electrical junction box. To make a turn in the
direction the mat is being installed, cut the mesh with scissors being careful not to
damage the heating cable.

THERMAL MANAGEMENT SOLUTIONS

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295

Technical Data
Sheets

Note: Do not cut the heating cable.

Floor Heating

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
Cold lead
Cold lead

Heating cable

DO NOT cut
heating cable

Fig. 21 Changing the direction of the mat

Since the heated area is slightly larger than the QuickNet mat, lay out the mat in
the areas you most want heated. The areas without a mat will not be heated and will
not be warm. The predetermined QuickNet spacing must be maintained to ensure
proper floor heating. In some cases, it may be necessary to pull the heating cable
out of the mat to cover small or irregular shaped areas. In this case, be careful
to remove the cable from the mat (do not cut the heating cable) and use the selfadhesive mat to hold the cable down on the floor.

Start

End

Sensor

Thermostat

Fig. 22 QuickNet floor heating mat layout for comfort floor heating

4. Determine the maximum circuit area for the heating mat
The maximum circuit area is determined by the supply voltage.
Table 14 Maximum QuickNet Circuit Area
Supply voltage

Maximum circuit area
15 A Breaker

20 A Breaker

120 V

120 ft2

140 ft2

208 / 240 V

240 ft2

280 ft2

If the heated area is less than the maximum circuit area, then the QuickNet floor
heating mats can be directly controlled by the QuickStat-TC thermostat (single
circuit control). The QuickStat-TC thermostat has built-in GFCI protection and can be
used with a standard circuit breaker. If the heated area is larger than the maximum
circuit area, multiple circuits and group control (Fig. 23) must be used.
Calculate the estimated number of circuits as follows:
Number of circuits =

Total heated area
Maximum circuit area

Round the number of circuits to the next largest whole number.

296

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Example: QuickNet heating mats for comfort floor heating
Group control

Maximum circuit area

280 ft2

Number of circuits

647 ft2 / 280 ft2 = 3 (rounded)

(1-100 ft2 circuit, 1-250 ft2 circuit, 1-280 ft2)

Advance to Step 5.

Fire Sprinkler System
Freeze Protection

Control method

Pipe Freeze Protection
and Flow Maintenance

Floor Heating Application Design

Roof and Gutter
De-Icing
Surface Snow
Melting – MI
Surface Snow
Melting – ElectroMelt
Freezer Frost
Heave Prevention
Floor Heating

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
Floor Heating System
Design Steps

Step 5 Determine the electrical parameters

1. Determine the
application

In this step you will determine the electrical parameters. This section is organized by
heating cable type.

2. Select the heating
cable system and
installation method

For RaySol self-regulating heating cables, see below.

3. Determine the
floor configuration
4. Determine the
heating cable spacing,
layout and length
5. Determine the
electrical parameters

For MI heating cables, see page 299.
For QuickNet floor heating mats, see page 301.
RaySol Self-Regulating heating cable
Determine number of circuits

6. Select the
connection kits
and accessories

Record the number of circuits (from Step 4) to be used on the worksheet.

7. Select the control
system

Select branch circuit breaking rating

8. Select the power
distribution
9. Complete the Bill
of Materials

For RaySol, the circuit breaker rating was determined in Step 4 using Table 5 or
Table 8.
Use ground-fault protection devices (GFPDs) for all RaySol heating cable
applications.
WARNING: To minimize the danger of fire from sustained electrical arcing if
the heating cable is damaged or improperly installed, and to comply with the
requirements of Pentair Thermal Management, agency certifications, and national
electrical codes, ground-fault equipment protection must be used on each heating
cable branch circuit. Arcing may not be stopped by conventional circuit protection.
Determine transformer load

The total transformer load is the sum of the loads on all the circuit breakers in the
system.
Calculate the Circuit Breaker Load (CBL) as:
CBL (kW) =

Circuit breaker rating (A) x 0.8 x Supply voltage
1000

Calculate the Total Transformer Load as follows:
Total Transformer Load (kW) = CBL1 + CBL2 + CBL3...+ CBLN
Example: RaySol heating cables for heat loss replacement
Heating cable catalog number

RaySol-2 (from Step 4)

Number of circuits

4 (from Step 4)

Circuit breaker rating

30 A breaker (from Step 4)

Circuit breaker load

(30 A x 0.8 x 208 V) / 1000 = 5kW

Total transformer load

5 kW x 4 = 20 kW

Example: RaySol heating cables for comfort floor heating
Heating cable catalog number

RaySol-2 (from Step 4)

Number of circuits

4 (from Step 4)

Circuit breaker rating

30 A breaker (from Step 4)

Circuit breaker load

(30 A x 0.8 x 208 V) / 1000 = 5kW

Total transformer load

5 kW x 4 = 20 kW

Advance to Step 6, page 302.

298

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THERMAL MANAGEMENT SOLUTIONS

MI heating cable
Determine number of circuits

For three-phase circuits used in floor heating systems, the three heating cables
are generally connected in the delta configuration shown in Fig. 24 on page 309.
Heating cables may also be connected using the wye configuration shown in Fig.
25 on page 310, but this configuration is less common. For both delta and wye
configurations, each set of three equal cables form a single circuit.

Fire Sprinkler System
Freeze Protection

For single-phase circuits, individual heating cables are normally connected to
separate circuit breakers. Multiple heating cables may be connected in parallel
to reduce the number of circuits with permission from the Authority Having
Jurisdiction. The single-phase heating cable current is shown in Table 10, Table 11,
and Table 12.

Pipe Freeze Protection
and Flow Maintenance

Floor Heating Application Design

Roof and Gutter
De-Icing

Select branch circuit breaking rating

The power output and heating cable current draw for the floor heating cables are
shown in Table 10, Table 11, and Table 12.
For single-phase circuits, the load current must not exceed 80% of the circuit
breaker rating.
Load current = Heating cable current (for a single circuit)

For a Delta connected three-phase circuit, shown in Fig. 24 on page 309, the load
current can be determined by multiplying the heating cable current times 1.732 and
it must not exceed 80% of the 3-pole circuit breaker rating.
Load current = Heating cable current x 1.732 (for a single Delta connected circuit)

Surface Snow
Melting – MI

Circuit breaker rating = Load current / 0.8

Load current = Heating cable current (for a single Wye connected circuit)
Circuit breaker rating = Load current / 0.8
Record the number and ratings of the circuit breakers to be used. Use ground-fault
protection devices (GFPDs) for all applications. For three-phase circuits, ground fault
may be accomplished using a shunt trip three-pole breaker and ground fault sensor.
Circuit breaker rating (amps) ________

Surface Snow
Melting – ElectroMelt

For a Wye connected three-phase circuit, shown in Fig. 25 on page 310, the load
current is the same as the heating cable current and it must not exceed 80% of the
3-pole circuit breaker rating.

Number of circuit breakers ________
Freezer Frost
Heave Prevention

WARNING: To minimize the danger of fire from sustained electrical arcing if
the heating cable is damaged or improperly installed, and to comply with the
requirements of Pentair Thermal Management, agency certifications, and
national electrical codes, ground-fault equipment protection must be used on
each heating cable branch circuit. Arcing may not be stopped by conventional
circuit protection.

Floor Heating

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
Determine transformer load

The total transformer load is the sum of the loads in the system. Calculate the Total
Transformer Load as follows:
For cables of equal wattage:
Cable (W) x Number of cables

Transformer load (kW) =

1000

When cable wattages are not equal:
Transformer load (kW) =

Cable1 (W) + Cable2 (W) + Cable3 (W)... + CableN (W)
1000

Example: MI heating cables for heat loss replacement
Heating cable catalog number

HLR24 (from Step 4)

Heating cable current

24.8 A (from Table 10)

Load current

24.8 x 1.732 = 43 A

Circuit breaker rating

60 A breaker, 80% loading 48 A

Number of circuit breakers

1 (3-pole breaker)

Cable wattage

5150 W (from Step 4)

Number of cables

3 (from Step 4)

Total transformer load

(5150 W x 3) / 1000 = 15.5 kW

Example: MI heating cables for comfort floor heating
Heating cable catalog number

FH21 (from Step 4)

Heating cable current

16.3 A (from Table 12)

Load current

16.3 A

Circuit breaker rating

25 A breaker, 80% loading 20 A

Number of circuit breakers

Cable wattage

3390 W (from Step 4)

Number of cables

2 (from Step 4)

Total transformer load

(3390 W x 2) / 1000 = 6.8 kW

Example: MI heating cables for radiant space heating
Heating cable catalog number

FH21 (from Step 4)

Heating cable current

16.3 A (from Table 12)

Load current

16.3 A

Circuit breaker rating

25 A breaker, 80% loading 20 A

Number of circuit breakers

Cable wattage

3390 W (from Step 4)

Number of cables

3 (from Step 4)

Total transformer load

(3390 W x 3) / 1000 = 10.2 kW

Advance to Step 6, page 302.

300

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THERMAL MANAGEMENT SOLUTIONS

Quicknet floor heating Mats
Determine number of circuits

Pipe Freeze Protection
and Flow Maintenance

Floor Heating Application Design

Record the number of circuits (from Step 4) to be used on the worksheet.

The recommended method of controlling the QuickNet floor heating mats is through
the QuickStat-TC thermostat supplied with the QuickNet heating system. The
QuickStat-TC thermostat has built-in GFCI protection and can be used with a 20 A
maximum standard circuit breaker to directly control 120 V heating mats in areas up
to 140 ft2 (13 m2) or 208/240 V heating mats in areas up to a 280 ft2 (26 m2). If several
QuickNet mats are required to cover areas larger than 280 ft2 (26 m2), then group
control should be used (see Step 8).

Roof and Gutter
De-Icing

WARNING: To minimize the danger of fire from sustained electrical arcing if
the heating cable is damaged or improperly installed, and to comply with the
requirements of Pentair Thermal Management, agency certifications, and
national electrical codes, ground-fault equipment protection must be used on
each heating cable branch circuit. Arcing may not be stopped by conventional
circuit protection. The QuickStat-TC thermostat includes built-in GFCI protection
that meets this requirement.

For cables of equal wattage:

Surface Snow
Melting – MI

Determine transformer load

The total transformer load is the sum of the loads in the system. Calculate the Total
Transformer Load as follows:

Cable (W) x Number of cables

Transformer load (kW) =

1000
Surface Snow
Melting – ElectroMelt

When cable wattages are not equal:
Transformer load (kW) =

Fire Sprinkler System
Freeze Protection

Select Branch Circuit Breaker Rating

Cable1 (W) + Cable2 (W) + Cable3 (W)... + CableN (W)
1000

Example: QuickNet heating mats for comfort floor heating
3 (from Step 4)

Circuit breaker rating

20 A breaker, 80% loading 16 A

Number of circuit breakers

Total power output

450 W + 720 W + (900 W x 5) = 5670 W

Total transformer load

5670 W / 1000 = 5.7 kW

Freezer Frost
Heave Prevention

Number of circuits

Advance to Step 6.

Floor Heating

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
Floor Heating System
Design Steps

Step 6 Select the connection kits and accessories
In this step you will determine the number of junction boxes, power connections, end
seals and splice kits required. This section is separated by heating cable type.

1. Determine the
application
2. Select the heating
cable system and
installation method

For RaySol self-regulating heating cables, see below.
For MI heating cables, see page 303.

3. Determine the
floor configuration

For QuickNet floor heating mats, see page 304.

4. Determine the
heating cable spacing,
layout and length

RaySol self-regulating heating cable

5. Determine the
electrical parameters

Select number of power connection Kits

6. Select the
connection kits
and accessories

For heat loss replacement, one FTC-P power connection kit and two junction boxes
are required per circuit. For comfort floor heating, one FTC-XC power connection kit
and two junction boxes are required per circuit

7. Select the control
system

Select junction box

8. Select the power
distribution

Select a contractor-supplied UL Listed and/or CSA Certified junction box that is
suitable for the location. Use a box with minimum internal volume of 16 cubic inches
if the box is metallic and 19 cubic inches if the box is not metallic.

9. Complete the Bill
of Materials

Note: The junction box must be accessible according to national electrical codes.
Table 15 Connection Kits and Accessories
Catalog
number

Description

Standard
packaging

FTC-P

Power connection and end seal.

1 per cable run (for heat loss
replacement)

1 per cable run (for comfort
floor heating and radiant
space heating)

Usage

RaySol Connection Kits

(Junction box not included)

FTC-XC

Power connection and end seal.
(Junction box not included)

FTC-HST

Low-profile splice/tee

As required (for embedded
applications, splice must be
accessible)

RayClic-E

Extra end seal

Replacement end seal

Example: RaySol heating cables for heat loss replacement
Junction box
Contractor supplied
Quantity 8
Connection kit
FTC-P
Quantity
4
Example: RaySol heating cables for comfort floor heating
Junction box
Contractor supplied
Quantity 8
Connection kit
FTC-XC
Quantity
4
Advance to Step 7, page 305.
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MI heating cables
A typical Pyrotenax floor heating system consists of several accessories. All of the
accessories work together to provide a safe and reliable floor heating system that is
easy to install and maintain.

Note: The junction box must be accessible according to the national electrical codes.

Fire Sprinkler System
Freeze Protection

Select junction box

Pipe Freeze Protection
and Flow Maintenance

Floor Heating Application Design

Select prepunched strapping
Roof and Gutter
De-Icing

For heat loss replacement applications, use stainless steel prepunched strapping
attached to the bottom of the concrete floor to secure the heating cables at the
proper spacing. For floor heating applications where the heating cable is embedded
in concrete or mortar floors, use galvanized steel prepunched strapping to maintain
the heating cables at the proper spacing.
Number of rolls required = Total area (ft2) x 0.005 (Total area (m2) x 0.05)
Table 16 Accessories
Description

HARD-SPACERGALV-25MM25M

Galvanized steel prepunched strapping.
Note: Use when cable is embedded in
concrete or mortar.

HARD-SPACERSS-25MM-25M

Usage

82 ft (25 m)
rolls

No. rolls = 0.005 x area (ft2)
No. rolls = 0.05 x area (m2)

82 ft (25 m)
Stainless steel prepunched strapping
rolls
Note: Use with all heat loss replacement
applications.
1
A cast aluminum junction box (NEMA 3) for
installation in nonhazardous and CID2 locations.
Three 1/2" NPT entries on bottom, provided with
plugs. Includes 4-pole terminal block (CSA 600 V, 65 A, 18 - 6 AWG; UL - 300 V, 65 A, 18 - 6
AWG). External mounting feet. CSA approved for
Class I, Div. 2, Groups A, B, C, and D.

No. rolls = 0.005 x area (ft2)
No. rolls = 0.05 x area (m2)
Surface Snow
Melting – ElectroMelt

D1297TERM4

Standard
packaging

Enclosure dimensions: 6 in x 6 in x 4 in
(150 mm x 150 mm x 100 mm).

Freezer Frost
Heave Prevention

Example: MI heating cables for heat loss replacement
Junction box
Contractor supplied
Quantity
1 (7 entries)
Prepunched strapping
HARD-SPACER-SS-25MM-25M
Quantity
16

Floor Heating

Example: MI heating cables for comfort floor heating
Junction box
D1297TERM4
Quantity 2
Prepunched strapping1 HARD-SPACER-GALV-25MM-25M
Quantity
4
Example: MI heating cables for radiant space heating
Junction box
D1297TERM4
Quantity 3
Prepunched strapping1 HARD-SPACER-GALV-25MM-25M
Quantity
4
1

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Technical Data
Sheets

For comfort floor heating and radiant space heating applications in slab floors,
prepunched strapping may not be required if it is possible to attach the heating
cable to the reinforcement.

Advance to Step 7, page 305.
THERMAL MANAGEMENT SOLUTIONS

Surface Snow
Melting – MI

Catalog
number

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
QuickNet floor heating Mats
Select junction box

The QuickStat-TC thermostat must be installed in an electrical junction box. Ensure
that the junction box is at a convenient height – typically 5 feet above the floor and
within reach of the cold lead and the floor temperature sensor. In group control,
each circuit must also have its own junction box where the cold leads can be wired
in parallel before connecting to the remote contactor. Select a UL Listed and/or
CSA Certified junction box that is suitable for the location. Use a box with minimum
internal volume of 16 cubic inches if the box is metallic and 19 cubic inches if the box
is not metallic.
Select QuickNet-Check

The QuickNet-Check monitor is used to verify the continuity of the QuickNet heating
cable and the integrity of its outer jacket during the installation process. The monitor
connects to the cold leads of the cable and, if the heating cable is damaged, the
alarm on the monitor will sound. The monitor can also be re-used for subsequent
installations and to help troubleshoot any problems that may arise.
Table 17 Accessories
Catalog
number
QUICKNETCHECK

Description
Monitor is used to verify the continuity of the
QuickNet heating cable and the integrity of its
outer jacket during the installation process.

Standard
packaging

Usage

Example: QuickNet heating mat for comfort floor heating
Junction box

Contractor supplied

Quantity

5 (1 for QuickStat-TC and 1 for each circuit)

QuickNet-Check QUICKNET-CHECK
Quantity 1
Advance to Step 7.

304

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THERMAL MANAGEMENT SOLUTIONS

Floor Heating System
Design Steps

Step 7 Select the control system

1. Determine the
application

3. Determine the
floor configuration
4. Determine the
heating cable spacing,
layout and length
5. Determine the
electrical parameters

7. Select the control
system
8. Select the power
distribution
9. Complete the Bill
of Materials

For RaySol and MI heating cables, the recommended control for heat loss
replacement and comfort floor heating is DigiTrace ECW-GF. For RaySol or MI
heating cable installations where temperature control and temperature monitoring
is desired, a Pentair Thermal Management DigiTrace C910-485 or DigiTrace ACS-30
controller is recommended.
For the QuickNet floor heating system, the QuickStat-TC thermostat and floor
sensor is supplied with each standard kit so no additional temperature controller is
required.

Roof and Gutter
De-Icing

6. Select the
connection kits
and accessories

Floor temperature sensing control must be used for heat loss replacement and
comfort floor heating applications, while an ambient temperature control with an
overlimit sensor must be used for radiant space heating applications.

Fire Sprinkler System
Freeze Protection

2. Select the heating
cable system and
installation method

There are two types of controls that may be used with floor heating systems: floor
temperature sensing control and ambient temperature control with overlimit sensor.

Pipe Freeze Protection
and Flow Maintenance

Floor Heating Application Design

Table 18 Temperature Control Options
Features

Sensor

DigiTrace
C910-485 2

DigiTrace
ACS-30

Single

Multiple

Thermistor

RTD 1

See data sheet

25 ft

Varies

Set point range

32°F to 200°F
(0°C to 93°C)

–0°F to 200°F
(–18°C to 93°C)

Enclosure

NEMA 4X

Deadband

2°F to 10°F
(2°C to 6°C)
–40°F to 140°F
(–40°C to 60°C)

1°F to 10°F
(1°C to 6°C)
–40°F to 140°F
(–40°C to 60°C)

30 A

DPST

100–277 V

Enclosure limits
Switch rating
Switch type
Electrical rating
Approvals

c-CSA-us

20 mA to 100 mA
(adjustable)

AC relay

2 A at 277 Vac

100–277 V,
0.75 A max.

Dry contact relay

2 A at 48 Vdc

48 Vac/dc, 500 mA
max.

Alarm outputs

1 Ordered separately
2 The C910-485 is available to provide RS-485 communication capability. Connect to the

Freezer Frost
Heave Prevention

c-UL-us
30 mA fixed

Ground-fault
protection

Surface Snow
Melting – ElectroMelt

Sensor length

Surface Snow
Melting – MI

Number of heating
cable circuits

DigiTrace
ECW-GF

BMS using DigiTrace ProtoNode multi-protocol gateways

Floor Heating

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
Table 19 Control Systems
Catalog number

Description

Electronic thermostats and accessories
ECW-GF

Electronic ambient sensing controller with 30-mA ground-fault protection. The controller can be programmed to maintain temperatures up to 200°F (93°C) at voltages from
100 to 277 V and can switch current up to 30 Amperes. The ECW-GF is complete with
a 25-ft (7.6-m) temperature sensor and is housed in a Type 4X rated enclosure. The
controller features an AC/DC dry alarm contact relay.
An optional ground-fault display panel (ECW-GF-DP) can be added to provide groundfault or alarm indication in applications where the controller is mounted in inaccessible
locations.

ECW-GF-DP

MI-GROUND-KIT

An optional remote display panel (ECW-GF-DP) that can be added to provide groundfault or alarm indication in applications where the controller is mounted in inaccessible locations.

Grounding kit for nonmetallic enclosures (for MI only)

Electronic controllers and sensors

A0
A1
A2
A3
A4
A5
A6
A7

C910-485

The C910-485 is a compact, full-featured microprocessor-based single-point heattrace controller. The C910-485 provides control and monitoring of electrical heattracing circuits for both freeze protection and temperature maintenance, and can
be set to monitor and alarm for high and low temperature, high and low current,
ground-fault level, and voltage. The DigiTrace C910-485 controller is available with an
electromechanical relay (EMR) for use in ordinary areas. The C910-485 comes with an
RS-485 communication module.

ACS-UIT2
ACS-PCM2-5

ProtoNode-LER
ProtoNode-RER

PROTOCESSOR
SERIAL ETHERNET

PROTONODE

B0
B1
B2
B3
S0
S1
S2
S3

By FieldServer Technologies
www.ProtoCessor.com

RS 485 GND
RS 485 RS 485+

The ProtoNode-LER is for LonWorks® systems; and the ProtoNode-RER is for
BACnet® or Metasys® N2 systems.

+PWR
- PWR
FRAME GND

RTD10CS
RTD-200
RTD50CS

306

Stainless steel jacketed three-wire RTD (Resistance Temperature Detector) used with
DigiTrace C910-485 and ACS-30 controllers.
RTD10CS: 10-ft (3 m) flexible armor, with 18-in (457 mm) lead wire and 1/2-inch NPT
bushing
RTD-200: 6-ft (1.8 m) fluoropolymer with 1/2-in NPT bushing
RTD-50: 50-ft (3 m) flexible armor with 1/2-in NPT bushing

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THERMAL MANAGEMENT SOLUTIONS

Example: RaySol heating cables for heat loss replacement
Multiple circuits, monitoring requested
ACS-30
Quantity 1

* Use ACS-30 General part number (P000001232) for custom three-phase panels. Please
contact your Pentair Thermal Management representative for a custom ACS-PCM2-5
panel quotation.

Example: RaySol and MI heating cables for comfort floor heating
Multiple circuits, electronic thermostat requested
ECW-GF
Quantity 1

Fire Sprinkler System
Freeze Protection

Example: MI heating cables for heat loss replacement
Single circuit, monitoring requested
ACS-30*
Quantity 1

Pipe Freeze Protection
and Flow Maintenance

Floor Heating Application Design

Roof and Gutter
De-Icing

Example: QuickNet heating mats for comfort floor heating
Multiple circuits, electronic thermostat
QuickStat-TC
Quantity 1
Example: MI heating cables for radiant space heating
Multiple circuits, electronic thermostat requested1 ECW-GF
Quantity 1
1 Ambient control to be supplied by the contractor

Surface Snow
Melting – MI
Surface Snow
Melting – ElectroMelt
Freezer Frost
Heave Prevention
Floor Heating

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Step 8 Select the power distribution
Power to the heating cables can be provided in several ways:
• Directly through the temperature controller
• Through external contactors activated by a temperature controller
• Through an HTPG power distribution panel
Single circuit control

RaySol and MI heating cable circuits that do not exceed the current rating of the
selected control can be switched directly (Fig. 24). When the total electrical load
exceeds the rating of the controller, an external contactor is required.
The three-phase Delta and Wye configurations shown in Fig. 234 and Fig. 25 are
common wiring configurations for MI heating cables used to heat large areas. DO
NOT use these wiring configurations for RaySol heating systems. A single pole
temperature controller may be used to control a three-phase circuit through a
contactor.
The recommended method of controlling the QuickNet floor heating mats is through
the QuickStat-TC thermostat supplied with the QuickNet heating system. The
QuickStat-TC thermostat has built-in GFCI protection and can be used with a 20 A
maximum standard circuit breaker to directly control 120 V heating mats in areas up
to 140 ft2 (13 m2) or 208/240 V heating mats in areas up to a 280 ft2 (26 m2). If several
QuickNet mats are required to cover areas larger than 280 ft2 (26 m2), then group
control should be used.
Group control

For group control, a single temperature controller may be used to control two or
more single-phase or three-phase circuits. Multiple single-phase RaySol or MI
heating cable circuits may be controlled by a single temperature controller, through
a contactor, as shown in Fig. 23. Multiple three-phase MI heating cable circuits may
be controlled in the same manner.
If several QuickNet mats are required to cover areas larger than 280 ft2 (26 m2), then
the group control method, using an external contactor (Fig. 23), should be used. The
QuickStat-TC may be used to control the contactor, but the built-in GFCI protection
will not function. Each QuickNet heating mat circuit must be connected to a groundfault circuit breaker.

308

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THERMAL MANAGEMENT SOLUTIONS

Single circuit control

Group control
Temperature
controller

Temperature
controller

1 ø supply
N

1-pole
GFEP breaker

ø supply
N

ø
ø
ø

Heating cable
sheath, braid
or ground

3-phase 4-wire
supply (WYE)

Fire Sprinkler System
Freeze Protection

Heating
cable

Pipe Freeze Protection
and Flow Maintenance

Floor Heating Application Design

Roof and Gutter
De-Icing

Contactor

3-pole main
breaker
N
G

Heating cable
sheath, braid
or ground

Fig. 23 Single circuit and group control

Surface Snow
Melting – MI

Ground

Three-phase
4-wire supply

MCB

Surface Snow
Melting – ElectroMelt

3-pole contactor
120 volt coil

to
120 V

3-pole circuit
breaker with shunt
trip/external groundfault sensor

Temperature
controller

Freezer Frost
Heave Prevention

To ground
fault module

Ground-fault
sensor

Note: Heating cable voltage is
the same as the phase-tophase voltage (VØ-Ø)

Floor Heating

Heating
cable sheath,
braid or ground

Note: For Delta connected
heating cables, the current
in the supply feeder,
contactor, and breaker is
equal to the “Heating Cable
Current” x 1.732.
C

Fig. 24 Typical single circuit control for three-phase delta connected cables

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS

Ground A

Three-phase
4-wire supply
B

C
MCB

3-pole contactor
120 V coil

to
120 V

Temperature
controller

3-pole circuit
breaker with shunt
trip/external groundfault sensor

To groundfault module

Ground-fault
sensor

Note: Heating cable voltage is
the same as the phase-toneutral voltage (VØ-Ø / 3 ).

B
Heating cable
sheath, braid
or ground

Note: For Wye connected
heating cables, the current in
the supply feeder, contactor,
and breakers is equal to the
‘Heating Cable Current.’

Fig. 25 Typical single circuit control for three-phase wye connected cables

Large systems with many circuits should use an HTPG power distribution panel. The
HTPG is a dedicated power-distribution, control, ground-fault protection, monitoring,
and alarm panel for broad temperature-maintenance heat-tracing applications. This
enclosure contains an assembled circuit-breaker panelboard. Panels are equipped
with ground-fault circuit breakers with or without alarm contacts. The group
control package allows the system to operate automatically in conjunction with a
temperature control system.

310

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Alarm horn (optional)

Main circuit
breaker

Push button for
light testing

R AR

Alarm relay
(optional)

COMMON ALARM
PUSH TO ACKNOWLEDGE

Selector switch

TB 1

1
2

Distribution
panelboard

7
8

Main
contactor

Fuse holder

Fire Sprinkler System
Freeze Protection

Door
disconnect
(optional)

Pipe Freeze Protection
and Flow Maintenance

Floor Heating Application Design

POWER ON

Terminals
(optional)

Roof and Gutter
De-Icing

HAND/OFF/AUTO

Ground
bus bar

TB 2

Surface Snow
Melting – MI

Alarm option shown above

Fig. 26 HTPG power distribution panel

Three-phase, 4 wire supply (Wye)

Ø1 Ø2Ø3 N G
Three-pole main
circuit breaker

Off

Contactor
coil

Auto

External controller/
thermostat*

Panel
energized

One-pole with 30-mA
ground-fault trip
(120/277 Vac)

Alarm
remote
annunciation
(with alarm
option)

Power
connection

Surface Snow
Melting – ElectroMelt

Three-pole main
contactor

Hand

Heating cable
End seal
Heating
cable
circuit
Heating cable shealth, braid or ground

Two-pole with 30-mA
ground-fault trip
(208/240 Vac)

Freezer Frost
Heave Prevention

Heating
cable
circuit

Fig. 27 HTPG power schematic

Floor Heating

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Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
Table 20 Power Distribution
Catalog number

Description

Power Distribution and Control Panels
HTPG

Heat-tracing power distribution panel with ground-fault and monitoring for group
control.

E104

COMMON ALARM
PUSH TO ACKNOWLEDGE
A

POWER ON
C

HAND/OFF/AUTO

Contactors

Enclosure dimensions: 13-1/2 in x 9-1/5 in x 6-11/16 in (343 mm x 234 mm x 170 mm).
E304

Example: RaySol heating cables for comfort floor heating
Contactor* E104
Quantity 1
* Required because total load current exceeds the maximum 30 A current rating of
ECW-GF thermostat.
Example: MI heating cables for comfort floor heating
Contactor* E304
Quantity 1
* Required because maximum current rating of the ECW-GF thermostat is 30 A and
total load current for this example is 32.6 A.
Example: MI heating cables for radiant space heating
Contactor* E104
Quantity 1
* Required because maximum current rating of the ECW-GF thermostat is 30 A and
total load current for this example is 48.9 A.

312

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THERMAL MANAGEMENT SOLUTIONS

Floor Heating System
Design Steps

Step 9 Complete the Bill of Materials

1. Determine the
application

Fire Sprinkler System
Freeze Protection

2. Select the heating
cable system and
installation method

If you used the Design Worksheet to document all your design parameters, you
should have all the details necessary complete your Bill of Materials.

Pipe Freeze Protection
and Flow Maintenance

Floor Heating Application Design

3. Determine the
floor configuration
4. Determine the
heating cable spacing,
layout and length
5. Determine the
electrical parameters

Roof and Gutter
De-Icing

6. Select the
connection kits
and accessories
7. Select the control
system
8. Select the power
distribution
9. Complete the Bill
of Materials

Surface Snow
Melting – MI
Surface Snow
Melting – ElectroMelt
Freezer Frost
Heave Prevention
Floor Heating

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
Floor Heating Pre-Design Worksheet
Step 1 Determine the application (see page 270)
Select the application that best describes your needs
❑ Heat loss replacement
❑ Comfort floor heating
❑ Radiant space heating

If you have selected the radiant space heating application, use the MI Heating Cable Floor Heating Design Worksheet on page 323.

Step  Determine the installation method
Select the installation you plan to use.
Heat loss replacement
❑ Attach to the bottom of the floor
❑ RaySol
❑ MI

Comfort floor heating
❑ Embed in concrete
❑ RaySol
❑ MI
❑ Embed in mortar bed
❑ RaySol
❑ MI
❑ Embed in thin set
❑ QuickNet
❑ Embed in self-levelling mortar
❑ QuickNet

Radiant space heating
❑ Embed in concrete
❑ RaySol*
❑ MI
❑ Embed in mortar bed
❑ RaySol*
❑ MI

* Please contact Pentair Thermal Management for design assistance.

314

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THERMAL MANAGEMENT SOLUTIONS

RaySol Heating Cable Floor Heating Design Worksheet
Heat Loss Replacement
Minimum
ambient
design
temperature

Heat loss replacement (see Fig. 11 on page 272)
X

Side A (length)
(ft/m)

Side B (width)
(ft/m)

Insulation
R-value

_______°F/°C
Heated area
(ft2/m2)

Supply voltage
and phase

_____________ ________Volts
ft2·°F·hr/Btu
________ Phase

Fire Sprinkler System
Freeze Protection

Step 3 Determine the floor configuration (Steps 1 and 2 were completed in the pre-design worksheet)

Control
requirements
____________
____________

Side A (length)
(ft/m)

40 ft
Side B (width)
(ft/m)

–10°F

3200 ft2

R-20
(20 ft2·°F·hr/Btu)

Heated area
(ft2/m2)

208 V
Single phase

Electronic thermostat,
monitoring requested

Roof and Gutter
De-Icing

Example: RaySol heating cables for heat loss
replacement
80 ft

Pipe Freeze Protection
and Flow Maintenance

RaySol Heating Cable Floor Heating Design Worksheet

Step 4 Determine the heating cable spacing, layout and length
4.1 Select the appropriate RaySol heating cable (see Table 3 on page 275)
________________ (from Step 3)
________________ (from Table 3)

Surface Snow
Melting – MI

Supply voltage:
Catalog number:

Example: RaySol heating cables for heat loss replacement
Supply voltage:

208 V (from Step 3)

Catalog number:

RaySol-2 (from Table 3)

4.2 Determine the RaySol heating cable spacing (see Table 4 on page 276)
Minimum ambient temperature: ___________°F/°C (from Step 3)
___________

Heating cable spacing:

___________in/cm (from Table 4)

Surface Snow
Melting – ElectroMelt

Insulation R-value:

(from Step 3)

Example: RaySol heating cables for heat loss replacement
Minimum ambient temperature: –10°F (from Step 3)
Insulation R-value:

R-20 (from Step 3)

Heating cable spacing:

24 in (from Table 4)
Freezer Frost
Heave Prevention

4.3 Determine the RaySol heating cable layout and length
Imperial

(

Heated area (ft2)
(from Step 3)

x 12 ) /

Heating cable spacing (in)
(from Step 4.2)

Estimated heating cable length

Metric

(

x 100 ) /

Heating cable spacing (cm)
(from Step 4.2)

Estimated heating cable length

Floor Heating

Heated area (m2)
(from Step 3)

Example: RaySol heating cables for heat loss replacement
Estimate the heating cable length

(

3200 ft2

Heated area (ft )
(from Step 3)
2

x 12 ) /

24 in
Heating cable spacing
(from Step 4.2)

1600 ft
Estimated heating cable length

(

40 ft

x 12 ) /

24 in

Side BMANAGEMENT SOLUTIONS
Heating cable EN-FloorHeatingSystem-DG-H58157
spacing
Number of heating cable
11/13 runs
THERMAL
(from Step 3)

(from Step 4.1)

315

Technical Data
Sheets

Determine the number of heating cable runs required

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
Step 4 Determine the heating cable spacing, layout and length
4.4 Determine the maximum circuit length for the heating cable length (see Table 5 on page 277)

Estimated heating cable length (ft/m)
(from Step 4.3)

Maximum circuit length (ft/m)
(from Table 5)

Number of circuits

Round the number of circuits to the next larger whole number
Example: RaySol heating cables for heat loss replacement
1600 ft
Estimated heating cable length
(from Step 4.3)

410 ft
Maximum circuit length
(from Table 5)

4 (rounded)
Number of circuits

Power supply: Four 30 A circuit breakers

316

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Step 4 Determine the heating cable spacing, layout and length
4.5 Determine the additional heating cable allowance (see Table 6 on page 278)

Pipe Freeze Protection
and Flow Maintenance

RaySol Heating Cable Floor Heating Design Worksheet

End allowance
=
Number of ends

ft/m per end
(from Table 6)

Fire Sprinkler System
Freeze Protection

x
Number of circuits
(from Step 4.4)

End allowance (ft/m)

Connection kit allowance
x

=
Connection kit allowance (ft/m)

Roof and Gutter
De-Icing

ft/m per connection kit
(from Table 6)

Number of kits

Total heating cable allowance
+
End allowance (ft/m)

=
Total heating cable
allowance (ft/m)

Connection kit allowance (ft/m)

Estimated total heating cable length
Surface Snow
Melting – MI

+
Estimated heating cable length (ft/m)
(from Step 4.3)

=
Estimated total heating
cable length (ft/m)

Total heating cable allowance (ft/m)

Example: RaySol heating cables for heat loss replacement
End allowance
4

ft/m per end
(from Table 6)

Number of circuits
(from Step 4.4)

32 ft

Surface Snow
Melting – ElectroMelt

End allowance

Number of ends

Connection kit allowance
4

Number of kits

ft/m per connection kit
(from Table 6)

16 ft
Connection kit allowance

Freezer Frost
Heave Prevention

Total heating cable allowance
32 ft

16 ft

End allowance

48 ft
Total heating cable
allowances (ft/m)

Connection kit allowance

Estimated total heating cable length
1600 ft

48 ft

Total heating cable allowances (ft/m)

1648 ft
Floor Heating

Estimated heating cable length
(from Step 4.3)

Estimated total heating
cable length (ft/m)

4.6 Locate the junction boxes for the RaySol heating cable (see Fig. 14 on page 276 for examples of a typical system)
4.7 Lay out the heating cable runs, circuits, and junction boxes
4.8 Record the circuit information

THERMAL MANAGEMENT SOLUTIONS

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Technical Data
Sheets

Advance Step 5 on on page 321.

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
Comfort Floor Heating
Step 3 Determine the floor configuration (Steps 1 and 2 were completed in the pre-design worksheet)
x

Side A (length)
(ft/m)

Side B (width)
(ft/m)

Minimum
ambient
design
temperature

Total area
(ft2/m2)

Comfort floor heating (see Fig. 12 on page 273)
Totalarea
area
Total
2
/m2)2)
(ft(ft2/m

––

==
Heated
area
Permanent fixture
fixture
Heated
area
Permanent
2
2
2
2 /m
space
(ft22/m
(ft(ft
(ft2/m
) )
/m2) )

_________°F/°C

Insulation
R-value

Supply voltage
and phase

Control
requirements

_____________
ft2·°F·hr/Btu

________Volts

____________

________ Phase

____________

Example: QuickNet heating mats for comfort floor heating
34 ft

Side A
(see Figure 12)
680 ft2
Total area

–

20 ft

680 ft2

Side B
(see Figure 12)
(22 ft2 counter + 11 ft2 columns)
Permanent fixture space
(see Figure 12)

Total area
647 ft2
Heated area

Minimum ambient design temperature: 10°F
Insulation R-value:

R-30

Supply voltage and phase:

208 V, single phase

Control requirements:

Electronic thermostat

Step 4 Determine the heating cable spacing, layout and length
4.1 Select the appropriate RaySol heating cable (see Table 3 on page 275)
Supply voltage:

________________ (from Step 3)

Catalog number:

________________ (from Table 3)

Example: RaySol heating cables for comfort floor heating
Supply voltage:

208 V (from Step 3)

Catalog number:

RaySol-2 (from Table 3)

4.2 Determine the RaySol heating cable spacing (see Table 7 on page 279)
Minimum ambient design temperature: ___________°F/°C (from Step 3)
Insulation R-value:

___________

Heating cable spacing:

___________in/cm (from Table 7)

(from Step 3)

Example: RaySol heating cables for comfort floor heating
Minimum ambient design temperature: 10°F (from Step 3)
Insulation R-value:

R-30 (from Step 3)

Heating cable spacing:

8 in (from RaySol Heating Cable Spacing for Comfort Floor Heating)

318

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THERMAL MANAGEMENT SOLUTIONS

Step 4 Determine the heating cable spacing, layout and length
4.3 Determine the RaySol heating cable layout and length (see Fig. 16 on page 280)

Pipe Freeze Protection
and Flow Maintenance

RaySol Heating Cable Floor Heating Design Worksheet

Imperial
Heated area (ft2)
(from Step 3)

x 12 ) /

Heating cable spacing (in)
(from Step 4.2)

Fire Sprinkler System
Freeze Protection

(

Estimated heating cable length

Metric

(

Heated area (m2)
(from Step 3)

x 100 ) /

Heating cable spacing (cm)
(from Step 4.2)

Estimated heating cable length

Roof and Gutter
De-Icing

Example: RaySol heating cables for comfort floor heating
Estimate the heating cable length

(

647 ft2
Heated area (ft)
(from Step 3)

x 12 ) /

8 in
Heating cable spacing
(from Step 4.2)

971 ft
Estimated heating cable length

Surface Snow
Melting – MI

Determine the number of heating cable runs required
4.4 Determine the maximum circuit length for the heating cable length and layout (see Table 8 on page 280)
40 ft
24 in
20
(
x 12 ) /
=
Side B
Heating
Number of heating cable
runs
/ cable spacing
=
Estimated
heating
Number of circuits
circuit length (ft/m)
(from Step
3) cable length (ft/m)(from StepMaximum
4.1)
(from Step 4.3)
(from Table 8)
Round the number of circuits to the next larger whole number
Example: RaySol heating cables for comfort floor heating

Estimated heating cable length required
(from Step 4.3)

275 ft
Maximum heating cable circuit length
(from Table 8)

4 (rounded)

Surface Snow
Melting – ElectroMelt

971 ft

Number of circuits

Power supply: Four 30 A circuit breakers (from Table 8)

Freezer Frost
Heave Prevention
Floor Heating

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Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
Step 4 Determine the heating cable spacing, layout and length
4.5 Determine the additional heating cable allowance (see Table 6 on page 278)
End allowance
x

=
Number of ends

ft/m per end
(from Table 6)

Number of circuits
(from Step 4.4)

End allowance (ft/m)

Connection kit allowance
x

=
ft/m per connection kit
(from Table 6)

Number of kits

Connection kit allowance (ft/m)

Total heating cable allowance
+

End allowance (ft/m)

Total heating cable
allowance (ft/m)

Connection kit allowance (ft/m)

Estimated total heating cable length
+
Estimated heating cable length (ft/m)
(from Step 4.3)

=
Estimated total heating
cable length (ft/m)

Total heating cable allowance (ft/m)

Example: RaySol heating cables for comfort floor heating
End allowance
4

ft/m per end
(from Table 6)

Number of circuits
(from Step 4.4)

32 ft
End allowance

Number of ends

Connection kit allowance
4

Number of kits

ft/m per connection kit
(from Table 6)

16 ft
Connection kit allowance

Total heating cable allowance
32 ft

16 ft

End allowance

48 ft
Total heating cable
allowance (ft/m)

Connection kit allowance

Estimated total heating cable length
971 ft
Estimated heating cable length
(from Step 4.3)

48 ft

1019 ft
Estimated total heating
cable length (ft/m)

Total heating cable allowance (ft/m)

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Step 5 Determine the electrical parameters
Determine transformer load

Pipe Freeze Protection
and Flow Maintenance

RaySol Heating Cable Floor Heating Design Worksheet

Calculate the circuit breaker load (CBL)
x

Circuit breaker rating

0.8 x

Supply voltage

)

/ 1000

Circuit breaker load (kW)

If the CBL is equal on all circuits, calculate the transformer load as:

Circuit breaker load (kW)

Number of breakers

Total transformer load (kW)

CBL1 + CBL2 + CBL3... + CBLN

Total transformer load (kW)

Roof and Gutter
De-Icing

If the CBL is NOT equal on all circuits, calculate the transformer load as:

Fire Sprinkler System
Freeze Protection

(

Example: RaySol cables for heat loss replacement and comfort floor heating
Determine transformer load:
30 A

Circuit breaker rating
5 kW

Circuit breaker load (kW)

0.8

208 V

Supply voltage

)

/ 1000

Number of breakers

Rounded to 5 kW
Circuit breaker load (kW)
20 kW
Total transformer load (kW)

Surface Snow
Melting – MI

(

Step 6 Select the connection kits and accessories
Quantity

❑ FTC-P

_____________

❑ FTC-XC
❑ FTC-HST
❑ RayClic-E

Surface Snow
Melting – ElectroMelt

RaySol connection kits

_____________
_____________
_____________

Example: RaySol heating cables for heat loss replacement

0 FTC-P (1 per cable run)

0 FTC-XC (1 per cable run)

Freezer Frost
Heave Prevention

Example: RaySol heating cables for comfort floor heating
4

Step 7 Select the control system (see Table 19 on page 306)
Control system

Quantity

❑ ECW-GF

_____________

T ECW-GF-DP
❑ C910-485
❑ ACS-UIT2
❑ ACS-PCM2-5
❑ ProtoNode-LER
❑ ProtoNode-RER
❑ RTD10CS
❑ RTD-200

THERMAL MANAGEMENT SOLUTIONS

_____________
_____________
_____________
_____________
_____________
_____________
_____________
_____________

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Technical Data
Sheets

❑ RTD50

_____________
Floor Heating

T MI-GROUND-KIT

_____________

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
Example: RaySol heating cables for heat loss replacement

0 DigiTrace ACS-30

Example: RaySol heating cables for comfort floor heating

0 ECW-GF

Step 8 Select the power distribution (see Table 20 on page 312)
Power Distribution and Control Panels

Quantity

❑ HTPG

_____________

Contactors
❑ E104

_____________

❑ E104

_____________

Example: RaySol heating cables for comfort floor heating

0 E104

Step 9 Complete the Bill of Materials
Use the information recorded in this worksheet to complete the Bill of Materials.

322

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MI Heating Cable Floor Heating Design Worksheet
Heat Loss Replacement

Pipe Freeze Protection
and Flow Maintenance

MI Heating Cable Floor Heating Design Worksheet

Step 3 Determine the floor configuration (Steps 1 and 2 were completed in the pre-design worksheet)

Heat loss replacement (see Fig. 11 on page 272)

Side A (length)
(ft/m)

Side B (width)
(ft/m)

Heated area
(ft2/m2)

Supply voltage
Insulation R-value and phase

–10°F

R-20
(20 ft2·°F·hr/Btu)

_______Volts

Control
requirements

____________

_______ Phase ____________

Example: MI heating cables for heat loss replacement
80 ft

40 ft

Side A (length)
(ft/m)

Side B (width)
(ft/m)

3200 ft2
Heated area
(ft2/m2)

208 V
Three-phase

Electronic thermostat,
monitoring requested

Roof and Gutter
De-Icing

______°F/°C

_____________
ft2·°F·hr/Btu

Fire Sprinkler System
Freeze Protection

Minimum
ambient
design
temperature

Step 4 Determine the heating cable spacing, layout and length
4.1 Select heating cable (For design power, see Table 9 on page 283; for heating cable selection, see Table 10 on page 286.)
Surface Snow
Melting – MI

Determine the design power

Heated area:

________________ (from Step 3)

Supply voltage and phase:

________________ (from Step 3)

Minimum ambient design temperature: ________________ (from Step 3)
Insulation R-value:

________________ (from Step 3)

Design power:

________________ (from Table 9 on page 283)

Determine the power requirement:

Design power
(W/ft2) (W/m2)

Total area or
subsection area (ft2/m2)

Surface Snow
Melting – ElectroMelt

Single-phase supply
Power required
(W)

Three-phase supply
x

Subsection area
(ft2/m2)

Power required
(for each subsection) (W)

Freezer Frost
Heave Prevention

Design power
(W/ft2) (W/m2)

Select the heating cable

Heating cable catalog number:

________________ (from Table 10 on page 286)

Cable wattage:

________________ (from Table 10 on page 286)

Three-phase supply (see Fig.18)

Cable voltage:

2.2 W/ft
Heating
cable length:
2

Number
of cables:
Design power

(

3200 ft2

________________ (from Table 10 on page 286)
3
________________
(from Table2347
10 onWpage 286)

) =
/
Heated area ________________
Number of
subsections

Power required
Floor Heating

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323

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor
Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
Single-phase supply
x heating cable spacing,
= layout and length
Step 4 Determine the
Design power

Power required

Total area or

2
2
(W/ft2) (W/m
(W)
)
subsection
arealoss
(ft2/m
)
Example:
MI heating
cables
for heat
replacement

Determine the design power

Heated
area: supply
Three-phase
Supply voltage and phase:

3200 ft2 (from Step 3)
208 V, three-phase (from Step 3)

Minimum
Steprequired
3)
Designambient
power design temperature:
Subsection area–10°F (from
Power
(W/ft ) (W/m
)
Insulation
R-value:
2

(ft /m )

each
subsection)
(W)
R-20(for
(from
Step
3)

Design power:

2.2 W/ft2 (from Table 9 on page 283)

Determine the power requirement:
Three-phase supply (see Fig.18)
2.2 W/ft2

(

Design power

3200 ft2
Heated area

3
Number of
subsections

) =

2347 W
Power required

Heating cable catalog number:

HLR24 (from Table 10 on page 286)

Cable wattage:

5150 W (from Table 10 on page 286)

Cable voltage:

208 V (from Table 10 on page 286)

Heating cable length:

420 ft (from Table 10 on page 286)

Number of cables:

3 (one cable required for each subsection)

4.2 Determine the heating cable spacing
Imperial
(

Area (ft2)

12 in ) /

Heating cable length (ft)

Cable spacing (in)

Metric
(

Area (m2)

x 100 cm ) /

Heating cable length (m)

Cable spacing (cm)

Example: MI heating cables for heat loss replacement
Subsection area:
1067 ft2 (from Step 4.1)
Heating cable catalog number: HLR24 (from Step 4.1)
Heating cable length:
420 ft (from Step 4.1)

(

1067 ft2
Subsection area

12 in ) /

420 ft
Heating cable length

31 in (rounded)
Cable spacing (in)

Advance Step 5 on on page 328.

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THERMAL MANAGEMENT SOLUTIONS

Comfort Floor Heating
Step 3 Determinexthe floor configuration
(Steps 1 and 2 were completed in the pre-design worksheet)
=

Total
Total area
area
(ft
/m22))
(ft22/m

–

Permanent
Permanentfixture
fixture
space
/m22))
space(ft
(ft22/m

Minimum ambient
design
temperature

_________°F/°C
Heatedarea
area
Heated
2 2 2 2
/m) )
(ft(ft
/m

Insulation
R-value

Supply voltage
and phase

_____________ _______ Volts
ft2·°F·hr/Btu
_______ Phase

Control
requirements

Fire Sprinkler System
Freeze Protection

Total area
Side A (length)
Side B (width)
(ft2/m2)
(ft/m)
(ft/m)
Comfort floor heating (see Fig. 12 on page 273)

____________
____________

Example: MI heating cables for comfort floor heating
34 ft

680 ft2
Total area

–

680 ft2

Side B
(see Figure 12)
(22 ft2 counter + 11 ft2 columns)
Permanent fixture space
(see Figure 12)

Roof and Gutter
De-Icing

Side A
(see Figure 12)

20 ft

Pipe Freeze Protection
and Flow Maintenance

MI Heating Cable Floor Heating Design Worksheet

Total area
647 ft2

Heated area

Minimum ambient design temperature: 10°F
R-30

Supply voltage and phase:

208 V, single phase

Control requirements:

Electronic thermostat

Surface Snow
Melting – MI

Insulation R-value:

Step 4 Determine the heating cable spacing, layout, and length
4.1 Select the heating cable (see Table 11 on page 289 and Table 12 on page 290)
________________ (from Step 3)

Supply voltage and phase:

________________ (from Step 3)

Surface Snow
Melting – ElectroMelt

Heated area:
Subsection area:
Heated area (ft2/m2)

Number of subsections

Subsection area (ft2/m2)

________________ (from Table 11 on page 289 or Table 12 on page 290)

Cable wattage:

________________ (from Table 11 on page 289 or Table 12 on page 290)

Cable voltage:

________________ (from Table 11 on page 289 or Table 12 on page 290)

Heating cable length:

________________ (from Table 11 on page 289 or Table 12 on page 290)

Number of cables:

________________

Freezer Frost
Heave Prevention

Heating cable catalog number:

Example: MI heating cables for comfort floor heating
Note: In this example, the subsections are equal heated areas.
Supply voltage and phase:
208 V, single phase (from Step 3)
Subsection area:
647 ft2
Heated area (ft2/m2)

(see Fig. 19 on page 288)
/

2
Number of subsections

324 ft2
Subsection area (ft2/m2)
Floor Heating

Heating cable catalog number:

FH21 (from Table 12 on page 290)

Cable wattage:

3390 W (from Table 12 on page 290)

Cable voltage:

208 V (from Table 12 on page 290)

Heating cable length:

425 ft (from Table 12 on page 290)

Number of cables:

2 (one cable required for each subsection)

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325

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
Step 4 Determine the heating cable spacing, layout, and length
4.2 Determine the heating cable spacing
Imperial
(

Area (ft2)

12 in ) /

Heating cable length (ft)

Cable spacing (in)

Metric
(

Area (m2)

x 100 cm ) /

Heating cable length (m)

Cable spacing (cm)

Round to the nearest 1/2 in or 1cm.
Example: MI heating cables for comfort floor heating
Subsection area:
324 ft2 (from Step 4.1)
Heating cable catalog number: FH21 (from Step 4.1)
Heating cable length:
425 ft (from Step 4.1)
324 ft2

(

Area

12 in ) /

425 ft
Heating cable length

9 in (rounded)

Cable spacing (in)

Advance Step 5 on page 328.

Radiant Space Heating
=
Step 3 Determinexthe floor configuration
(Steps 1 and 2 were completed in the pre-design worksheet)
Side A (length)
(ft/m)

Total area
(ft2/m2)

Side B (width)
(ft/m)

Btu requirement

(supplied by
engineer)

Radiant space heating (see Fig. 13 on page 274)
Total area
Total
area
2
(ft2/m
)
(ft2/m2)

–

=
Heated area
Permanent fixture=space
Heated
area
Permanent(ftfixture
2
2
(ft2/m2)
/m
)
2
2
2
(ft /m2)
space (ft /m )

_____________
Btu/hr

Supply voltage
and phase

Control
requirements

________Volts

____________

________ Phase

____________

Example: MI heating cables for radiant space heating
34 ft
Side A
(see Figure 13)
680 ft2
Total area

–

20 ft

Side B
(see Figure 13)
(22 ft2 counter + 11 ft2 columns)
Permanent fixture space
(see Figure 13)

680 ft2
Total area
647 ft2
Heated area

Btu requirement:

34,800 Btu/hr (supplied by engineer)

Supply voltage and phase:

208 V, single phase

Control requirements:

Electronic thermostat

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Step 4 Determine the heating cable spacing, layout, and length
4.1 Select the heating cable

________________ (from Step 3)
________________ (from Step 3)

Fire Sprinkler System
Freeze Protection

Heated area:
Supply voltage and phase:
Subsection area:
Heated area (ft2/m2)

Number of subsections

Btu requirement:

Subsection area (ft2/m2)

________________ (from Step 3)

Power required:
Btu/hr

/ 3.412 =

Power requirement (W)

________________

Heating cable catalog number:

________________ (from Table 11 on page 289 or Table 12 on page 290)

Cable wattage:

________________ (from Table 11 on page 289 or Table 12 on page 290)

Cable voltage:

________________ (from Table 11 on page 289 or Table 12 on page 290)

Heating cable length:

________________ (from Table 11 on page 289 or Table 12 on page 290)

10.8 ft

________________

20 ft

Roof and Gutter
De-Icing

Power per subsection:

Number of cables:

Pipe Freeze Protection
and Flow Maintenance

MI Heating Cable Floor Heating Design Worksheet

216 ft2

Example: MI
heating
for radiant
space
heatingSubsection area (ft2/m2)
Subsection
length
(ft/m)cables
Subsection
width
(ft/m)

Subsection area:
647 ft2
Heated area (ft2/m2)

Surface Snow
Melting – MI

Note: In this example, the subsections are equal heated areas.
Heated area:
647 ft2
Supply voltage and phase:
208 V, single-phase (from Step 3)
(see Fig. 20 on page 292)
/

3
Number of subsections

216 ft2
Subsection area (ft2/m2)

34,800 Btu/hr (from Step 3)

Power required:

34,800 Btu/hr / 3.412 = 10200 W

Power per subsection:

10200 W / 3 = 3400 W

Heating cable catalog number:

FH21 (from Table 12 on page 290)

Cable wattage:

3390 W (from Table 12 on page 290)

Cable voltage:

208 V (from Table 12 on page 290)

Heating cable length:

425 ft (from Table 12 on page 290)

Number of cables:

3 (one cable required for each subsection)

Surface Snow
Melting – ElectroMelt

Btu requirement:

Freezer Frost
Heave Prevention
Floor Heating

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327

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
Step 4 Determine the heating cable spacing, layout, and length
4.2 Determine the heating cable spacing
Imperial
(

Area (ft2)

12 in ) /

Heating cable length (ft)

Cable spacing (in)

Metric
(

Area (m2)

x 100 cm ) /

Heating cable length (m)

Cable spacing (cm)

Example: MI heating cables for radiant space heating
Subsection area:
216 ft2
Catalog number:
FH21
Heating cable length: 425 ft
(

216 ft2

Subsection area

425 ft

12 in ) /

Heating cable length

6 in (rounded)
Cable spacing (in)

Step 5 Determine the electrical parameters
5.1 Determine the number of circuits

Single-phase circuits (see Fig. 23 on page 309)

__________________________

Three-phase circuits (see Fig. 24 on page 309 and Fig. 25 on page 310)

__________________________

5.2 Select the branch circuit breaker rating
Single-phase circuit
Heating cable current (A)

Load current (A)

0.8 =

(for a single heating cable)
Load Current (A)

Circuit breaker rating

Delta-connected three-phase circuit
Heating cable current (A)

Load current (A)

x 1.732 =

0.8 =

(for 3 cables in Delta configuration)
Load current (A)

Circuit breaker rating

Wye-connected three-phase circuit
Heating cable current

Load current (A)

328

0.8 =

Load current (A)

(for 3 cables in Wye configuration)

Circuit breaker rating

EN-FloorHeatingSystem-DG-H58157

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THERMAL MANAGEMENT SOLUTIONS

Step 5 Determine the electrical parameters
5.3 Determine the transformer load

Pipe Freeze Protection
and Flow Maintenance

MI Heating Cable Floor Heating Design Worksheet

For cables of equal wattage
x

Cable (W)

Number of cables

)

/ 1000

) / 1000

Transformer load (kW)

When cable wattages are not equal

(

Cable1 (W) + Cable2 (W) + Cable3 (W)... + CableN (W)

Total transformer load (kW)

Heating cable current:

Roof and Gutter
De-Icing

Example: MI heating cables for heat loss replacement
Heating cable catalog number:
HLR24 (from Step 4.1)
24.8 A (from Table 10 on page 286)

Load current:
Delta-connected three-phase circuit
Delta-connected three-phase circuit
43 A (rounded)
24.8 A
x 1.732 =
24.8 A
43 A (rounded)
Heating cable current x 1.732 =
Load current
Load current
Heating cable current

60 A breaker, 80% loading 48 A

Number of circuit breakers:

1 (3-pole breaker)

Cable power output:

5150 W (from Step 4.1)

Number of cables:

3 (from Step 4.1)

Transformer load:
5150 W

3
) / 1000
x
3
x Number of cables ) / 1000
Cable power output
Number of cables

(
5150 W
(Cable power output

=
=

Surface Snow
Melting – MI

Circuit breaker size:

15.5 kW (rounded)
15.5 kW (rounded)
Transformer load
Transformer load
Surface Snow
Melting – ElectroMelt

Example: MI heating cables for comfort floor heating
Delta-connected three-phase circuit
Heating cable catalog number:
FH21 (from Step 4.1)
Heating24.8
cable
A current:

16.3
(from Table 12 on page 290)
43 A A(rounded)

Load
current:
Heating
cable current

16.3
A current
Load

x 1.732 =

Circuit breaker size:

25 A breaker, 80% loading 20 A
2

Cable power output:

3390 W (from Step 4.1)

Number of cables:

2 (from Step 4.1)

Freezer Frost
Heave Prevention

Number of circuit breakers:

Transformer load:
3390 W

(

Cable power output

Number of cables

)

/ 1000

6.8 kW (rounded)
Transformer load

Example:
MI heating
cables for
radiant space heating
Delta-connected
three-phase
circuit
Heating cable catalog number:
FH21 (from Step 4.1)
43 AA(rounded)
16.3
(from Table 12 on page 290)

Load
current:
Heating
cable current

16.3
A current
Load

Circuit breaker size

25 A breaker, 80% loading 20 A

Number of circuit breakers:

Cable power output:

3390 W (from Step 4.1)

Number of cables:

3 (from Step 4.1)

Floor Heating

Heating 24.8
cableA current:

x 1.732 =

Fire Sprinkler System
Freeze Protection

(

Transformer load:

(

3390 W

Cable power output

3
Number of cables

/ 1000

10.2 kW (rounded)
Transformer load

EN-FloorHeatingSystem-DG-H58157

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329

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

)

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
Step 6 Select the connection kits and accessories
MI accessories

Quantity

❑ D1297TERM4

Cast aluminum junction box

_____________

❑ HARD-SPACER-GALV-25MM-25M

Galvanized steel prepunched strapping

_____________

❑ HARD-SPACER-SS-25MM-25M

Stainless steel prepunched strapping (use for Heat _____________
Loss Replacement applications)

Example: MI heating cables for heat loss replacement

0 Junction Box
0 HARD-SPACER-SS-25MM-25M

(supplied by contractor)
16

Example: MI heating cables for comfort floor heating
2
0 D1297TERM4
0 HARD-SPACER-GALV-25MM-25M 4

Example: MI heating cables for radiant space heating
3
0 D1297TERM4
0 HARD-SPACER-GALV-25MM-25M 4

Step 7 Select the control system (see Table 19 on page 306)
Control system

Quantity

❑ ECW-GF

_____________

T ECW-GF-DP

_____________

❑ C910-485

_____________

❑ ACS-UIT2

_____________

❑ ACS-PCM2-5

_____________

❑ ProtoNode-LER

_____________

❑ ProtoNode-RER

_____________

❑ RTD10CS

_____________

❑ RTD-200

_____________

❑ RTD50

_____________

Example: MI heating cables for heat loss replacement

0 DigiTrace ACS-30

Example: MI heating cables for comfort floor heating

0 ECW-GF

Example: MI heating cables for radiant space heating

0 ECW-GF

Step 8 Select the power distribution (see Table 20 on page 312)
Power Distribution and Control Panels

Quantity

❑ HTPG

_____________

Contactors
❑ E104

_____________

❑ E304

_____________

Example: MI heating cables for comfort floor heating

0 E304

Example: MI heating cables for radiant space heating

0 E104

Step 9 Complete the Bill of Materials
Use the information recorded in this worksheet to complete the Bill of Materials.

330

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THERMAL MANAGEMENT SOLUTIONS

QuickNet Floor Heating System Design Worksheet
Comfort Heating
Side A (length)
(ft/m)

Total area
(ft2/m2)

Side B (width)
(ft/m)

Minimum
ambient
design
temperature

Comfort floor heating (see Fig. 12 on page 273)
=
–
Heated area _________°F/°C
Total area – Permanent fixture=
Heated
area
Permanent fixture
Total
area
2
2
(ft2/m
)
)
(ft2/m
space (ft2/m2)
(ft2/m2)
space (ft/m)
(ft/m)

Insulation
R-value

Supply voltage
and phase

Control
requirements

_____________
ft2·°F·hr/Btu

________Volts

____________

________ Phase

____________

Fire Sprinkler System
Freeze Protection

Step 3 Determinexthe floor configuration
(Steps 1 and 2 were completed in the pre-design worksheet)
=

Side A
(see Figure 12)
680 ft2
Total area

–

20 ft

680 ft2

Side B
(see Figure 12)
(22 ft2 counter + 11 ft2 columns)
Permanent fixture space
(see Figure 12)

Roof and Gutter
De-Icing

Example: QuickNet heating mats for comfort floor heating
34 ft

Pipe Freeze Protection
and Flow Maintenance

QuickNet Floor Heating System Design Worksheet

Total area
647 ft2

Heated area
Surface Snow
Melting – MI

Minimum ambient design temperature: 10°F
Insulation R-value:

R-30

Supply voltage and phase:

208 V, single phase

Control requirements:

Electronic thermostat

Step 4 Determine the heating cable spacing, layout, and length
Heated area:

________________

(from Step 3)

Supply voltage and phase: ________________

(from Step 3)

Required heating mats:

Surface Snow
Melting – ElectroMelt

4.1 Select the correct sized QuickNet heating mat (see Table 13 on page 295)

________________

________________
________________
________________

Heating mat quantities:

________________

Freezer Frost
Heave Prevention

Total heating mat area:

________________
________________
Example: QuickNet heating mats for comfort floor heating
Floor area:

647 ft2 (from Step 3)

Supply voltage and phase:

208 V, single-phase (from Step 3)

Total heating mat area:

630 ft2

Heating mat quantities:

QUICKNET-050-2, qty 1 (from Table 13 on page 295)
QUICKNET-080X-2, qty 1
QUICKNET-100X-2, qty 5

Floor Heating

Required heating mats – catalog numbers: 50 ft2 – QUICKNET-050-2 (from Table 13 on page 295)

80 ft2 – QUICKNET-080X-2

100 ft2 – QUICKNET-100X-2

4.2 Locate the junction box
4.3 Lay out the heating mat (see Fig. 22 on page 296)

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS
Step 4 Determine the heating cable spacing, layout, and length
4.4 Determine the maximum circuit area for the heating mat (see Table 14 on page 296)

Total heated area

Maximum circuit area

Number of circuits

Example: QuickNet heating mats for comfort floor heating
Maximum Circuit Area:

280 ft2 (from Table 14 on page 296)

Number of circuits:

647 ft2 / 280 ft2 = 3 (rounded) (from Table 14 on page 296)

Step 5 Determine the electrical parameters
5.1 Determine the number of circuits (see Step 4)
5.2 Determine the transformer load
For cables of equal wattage

(

Cable (W)

Number of cables

)

/ 1000

) / 1000

Transformer load (kW)

When cable wattages are not equal

(

Cable1 (W) + Cable2 (W) + Cable3 (W)... + CableN (W)

Total transformer load (kW)

Example: QuickNet heating mats for comfort floor heating
Floor area:
647 ft2 (from Step 3)
Supply voltage and phase:

208 V, single phase (from Step 3)

Heating mat quantities:

QUICKNET-050-2 – Qty 1 (from Step 4.1)
QUICKNET-080X-2 – Qty 1
QUICKNET-100X-2 – Qty 5

Maximum circuit area:

280 ft2 (from Step 4)

Number of circuits:

647 ft2 / 280 ft2 = 3 (rounded)
1-100 ft2 circuit, 1-250 ft2 circuit, 1-280 ft2 circuits

Circuit breaker size:

20 A breaker, 80% loading 16 A

Number of circuit breakers

Cable power output

450 W + 720 W + (900 W x 5) = 5670 W

Total transformer load

5670 W / 1000 = 5.7 kW

Step 6 Select the accessories
QuickNet accessories

Description

Quantity

❑ QUICKNET-CHECK

Monitor

_____________

Example: QuickNet heating mats for comfort floor heating

0 QuickNet-Check

Step 7 Select the control system
Not applicable (QuickStat-TC thermostat provided with standard kits)

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THERMAL MANAGEMENT SOLUTIONS

Step 8 Select the power distribution
Power Distribution and Control Panels

Quantity

❑ HTPG

_____________

❑ E104

_____________

❑ E104

_____________

Fire Sprinkler System
Freeze Protection

Contactors

Pipe Freeze Protection
and Flow Maintenance

QuickNet Floor Heating System Design Worksheet

Step 9 Complete the Bill of Materials
Use the information recorded in this worksheet to complete the Bill of Materials.

Roof and Gutter
De-Icing
Surface Snow
Melting – MI
Surface Snow
Melting – ElectroMelt
Freezer Frost
Heave Prevention
Floor Heating

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating – RaySol, Mineral Insulated, and QuickNet Heating SystemS

334

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THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection
and Flow Maintenance

Contents
Self-Regulating Heating Cables
XL-Trace Pipe freeze protection and flow maintenance heating cable. . . . . . . . . . . . . . . . . . 337
IceStop Roof and gutter de-icing heating cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 341

Roof and Gutter
De-Icing

This section provides individual technical data sheets for all of the Pentair Thermal
Management products. Each data sheet is also available in .pdf format on our web
site at www.pentairthermal.com

Fire Sprinkler System
Freeze Protection

Technical Data Sheets

ElectroMelt Surface snow-melting and anti-icing heating cable. . . . . . . . . . . . . . . . . . . . . 343
RaySol Floor heating and freezer frost heave prevention heating cable. . . . . . . . . . . . . . . . . 345

MI Heating Cable for Commercial Applications
Engineered copper and HDPE jacketed copper sheathed heating cables. . . . . . . . . . . . . . . 347

MI Heating Cable for Freezer Frost Heave Prevention

Surface Snow
Melting – MI

Mineral Insulated Heating Cables

Standard HDPE jacketed copper and Alloy 825 sheathed heating cables. . . . . . . . . . . . . . . 353

MI Heating Cable for Surface Snow Melting

Standard HDPE jacketed copper sheathed heating cables. . . . . . . . . . . . . . . . . . . . . . . . . 359

Heating Mats
QuickNet Floor heating system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 372
Electronic Temperature Controls
ACS-30 Multipoint commercial heat-tracing system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376

Surface Snow
Melting – ElectroMelt

MI Heating Cable for Heat Loss Replacement, Floor Heating and Radiant
Space Heating Standard copper and HDPE jacketed copper sheathed heating cables .. . . . . 364

C910-485 Series Single-point heat-tracing control system. . . . . . . . . . . . . . . . . . . . . . . . 383
HTPG Heat-tracing power distribution panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 391
Snow Melting and Gutter Controls
SMPG1 Snow melting and de-icing power distribution and control panel . . . . . . . . . . . . . . . 394

Freezer Frost
Heave Prevention

ECW-GF Ambient, pipe and slab electronic thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . 387

SMPG3 Snow melting and de-icing power distribution and control panel . . . . . . . . . . . . . . . 398
APS-3C Snow melting and gutter de-icing controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 403
APS-4C Snow melting and gutter de-icing controller with ground-fault protection. . . . . . . . . 406
PD Pro Snow and ice melting controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 412
GF Pro Snow and ice melting controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 414
RM-3 Gutter de-icing controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 416

Floor Heating

SC-40C Snow and ice melting satellite contactor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 409

RM-4 Gutter de-icing controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 418
CIT-1, GIT-1, SIT-6E Snow sensor, gutter sensor, pavement sensor . . . . . . . . . . . . . . . . . 420

335

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Technical Data Sheets
Thermostats
EC-TS Ambient, pipe and slab electronic thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 422
AMC-F5 Fixed set point freeze protection mechanical thermostat. . . . . . . . . . . . . . . . . . . . 424
AMC-1A Ambient-sensing mechanical thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 425
AMC-1B Line-sensing mechanical thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 426
Control and Monitoring Accessories
ProtoNode Multi-protocol device server. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 427
RMM2 / RMM2-4X Remote temperature monitoring module . . . . . . . . . . . . . . . . . . . . . . 429
Temperature Sensors
RTD-200 RTD temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 432
RTD3CS and RTD10CS RTD temperature sensors with stainless steel armor . . . . . . . . . . 433
RTD4AL RTD temperature sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 434
Connection Kits and Accessories
RayClic Connection Kits and Accessories

For XL-Trace, IceStop and HWAT self-regulating heating cables. . . . . . . . . . . . . . . . . . . . . 435

FTC Heat-Shrinkable Connection Kits

For XL-Trace, IceStop and RaySol self-regulating heating cables. . . . . . . . . . . . . . . . . . . . 438

ElectroMelt Connection Kits and Accessories
For ElectroMelt self-regulating heating cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 440

336

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection
and Flow Maintenance
Fire Sprinkler System
Freeze Protection

XL-Trace
Self-regulating heating cable
For pipe freeze protection and flow maintenance

Modified polyolefin (-CR)
or fluoropolymer (-CT)
outer jacket
Tinned-copper braid

Self-regulating conductive core
Nickel-plated copper bus wire

The heating element in the XL-Trace heating cable consists
of a continuous core of conductive polymer extruded
between two copper bus wires. The XL-Trace heating cable
regulates its power output in response to pipe temperature
changes. This self-regulating technology allows XL-Trace
heating cable to be overlapped or installed on plastic pipes
without overheating.

The same features that make an XL-Trace system easy to
install the first time also simplify additions or changes to the
system during building renovations.

Freezer Frost
Heave Prevention

Low total operating cost
Building operators are assured of optimal energy efficiency
and low maintenance costs when an XL-Trace system is
specified.

Surface Snow
Melting – ElectroMelt

Low total installed cost
The XL-Trace heating cable’s parallel circuitry allows it to
be cut to the exact length required, with no wasted cable. Its
flexibility allows it to be wrapped around complex fittings and
valves. All of these characteristics simplify and streamline
the design of a heat-tracing system. Installation is quick and
simple.

Surface Snow
Melting – MI

Modified polyolefin inner jacket

Raychem XL-Trace is designed for pipe freeze protection and
flow maintenance in the following applications:
• Freeze protection of general water piping (aboveground
and buried)
• Freeze protection of fire sprinkler system piping, including sprinklers
• Flow maintenance of greasy waste lines (aboveground
and buried)
• Flow maintenance of fuel lines (aboveground)

Roof and Gutter
De-Icing

Product Overview

Heating cable construction

For additional information, contact your Pentair Thermal
Management representative or call (800) 545-6258.
5XL1-CR/CT

5XL2-CR/CT

8XL1-CR/CT

8XL2-CR/CT

12XL2-CR/CT

Voltage

120 V

208–277 V

120 V

208–277 V

Maximum Operating Temperature

150°F (65°C)

Maximum Exposure Temperature

150°F (65°C)

185°F1 (85°C)1

0°F (–18°C)

Minimum Installation Temperature 0°F (–18°C)
Minimum Bend Radius

1/2 in (12 mm) 1/2 in (12 mm) 1/2 in (12 mm) 1/2 in (12 mm) 1/2 in (12 mm)

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Technical Data
Sheets

1 When the design requires 185°F (85°C) exposure temperature, all connections must be installed off the pipe.

THERMAL MANAGEMENT SOLUTIONS

Floor Heating

Catalog Number

XL-Trace
Maximum Circuit Length in Feet
40°F / 110°F Maintain*
Start-up
temperature
(°F)

5XL1
CB size
(A)
120 V

–20°F

101

20
30
0°F

20°F

40°F

8XL1
120 V

5XL2

8XL2
208 V

240 V

12XL2

208 V

240 V

277 V

208 V

240 V

277 V

174

178

183

131

138

146

111

114

117

134

101

232

237

245

175

184

194

148

151

156

201

151

349

356

367

262

276

291

223

227

234

270

201

465

474

478

349

368

388

297

303

312

115

199

203

209

149

157

166

120

122

126

153

115

265

271

279

199

209

221

160

163

168

230

172

398

406

419

298

314

331

239

244

252

270

210

470

490

530

370/399 390/420 420/443

319

326

336

134

100

232

237

244

173

182

192

126

129

133

178

133

309

315

325

231

243

257

169

172

177

270

200

464

473

488

346

365

385

253

258

266

270

210

470

490

530

370/462 390/486 420/513

340/349 344

355

160

119

278

283

292

206

217

229

142

145

150

214

159

370

378

390

275

290

306

190

194

200

270

210

470

490

530

370/416 390/438 420/462

285

291

300

270

210

470

490

530

370/554 390/584 420/616

340/398 360/406 380/419

50°F

–

228

240

254

152

155

160

(buried)

–

304

320

338

203

207

213

–

457

481

507

304

310

320

–

609

641

676

405

414

427

–

272

286

302

169

172

178

(indoors grease) 20

–

362

381

402

225

230

237

–

543

572

603

338

345

356

–

610

660

720

430

460

490

65°F

* When maximum circuit length is listed in:
–– black type, the value is for applications with a 40°F maintain
–– red type, the value is for applications with a 110°F maintain

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THERMAL MANAGEMENT SOLUTIONS

Maximum Circuit Length in Meters
4°C / 43°C Maintain*
5XL1
CB size
(A)
120 V

–29°C

–18°C

4°C

5XL2

8XL2

120 V

208 V

240 V

277 V

12XL2

208 V

240 V

277 V

208 V

240 V

277 V

106

108

112

142

145

149

106

112

118

121

124

128

101

143

149

162

102

113 /122 119 /128 128 /135

141

144

149

106

111

117

113 /141 119 /148 128 /156 104 /106 105

108

Roof and Gutter
De-Icing

–7°C

8XL1

143

149

162

113

115

119

143

149

162

113 /127 119 /134 128 /141

113 /169 119 /178 128 /188 104 /121 110 /124 116 /128

143

149

162

–

(buried grease)

–

103

–

139

147

155

–

186

195

206

124

126

130

18°C

–

(indoors grease)

–

110

116

123

–

166

174

184

103

105

108

–

186

201

220

131

140

149

Surface Snow
Melting – ElectroMelt

* When maximum circuit length is listed in:
–– black type, the value is for applications with a 40°F maintain
–– red type, the value is for applications with a 110°F maintain

Freezer Frost
Heave Prevention

Nominal Power Output on Metal Pipes at 120 V/208 V
14





5XL1-CR and 5XL1-CT (120 V)
5XL2-CR and 5XL2-CT (208 V)



8XL1-CR and 8XL1-CT (120 V)
8XL2-CR and 8XL2-CT (208 V)



12XL2-CR and 12XL2-CT (208 V)

10
8
6




4
2
0
30
(–1)

40
(5)

50
(10)

60
(15)

70
(21)

80
(27)

90
(32)

100
(38)

110
(43)

120
(49)

Floor Heating

Power W/ft

Surface Snow
Melting – MI

40
15

10°C

Fire Sprinkler System
Freeze Protection

Start-up
temperature
(°C)

Pipe Freeze Protection
and Flow Maintenance

XL-Trace

130 °F
(54) (°C)

Pipe temperature

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

XL-Trace
Bus Wires
16 AWG nickel-plated copper
Braid/Outer Jacket
Tinned-copper braid with modified polyolefin jacket (-CR) or fluoropolymer
jacket (-CT).
Dimensions

5XL and 8XL

12XL

Maximum width

0.56 in (14 mm)

0.62 in (16 mm)

Maximum thickness

0.24 in (6 mm)

92 lb/1000 ft

104 lb/1000 ft

Nominal Weight

Connection Kits
Raychem RayClic or FTC connection kits must be used with XL-Trace heating
cables. Refer to the Pipe Freeze Protection and Flow Maintenance Design Guide
(H55838) for proper connection kit selection.
Approvals
718K Pipe Heating Cable

-w

Refer to the Pipe Freeze Protection and Flow Maintenance Design Guide (H55838)
and the Fire Sprinkler Freeze Protections Design Guide (H58489) for specific
product approval details.
Ground-Fault Protection
To minimize the danger of fire from sustained electrical arcing if the heating
cable is damaged or improperly installed, and to comply with the requirements
of Pentair Thermal Managementy, agency certifications, and national electrical
codes, ground-fault equipment protection must be used on each heating cable
branch circuit. Arcing may not be stopped by conventional circuit protection.
Many DigiTrace control and monitoring systems meet the ground-fault protection
requirement.

340

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THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection
and Flow Maintenance
Fire Sprinkler System
Freeze Protection

IceStop
Self-regulating roof and gutter de-icing heating cable

Raychem IceStop is a roof and gutter de-icing system that
provides drain paths for the following applications:
• Roofs made from standard roofing materials, including
shake, shingle, rubber, tar, wood, metal, and plastic.
Fluoropolymer (-XT) or
modified polyolefin (-X)
outer jacket

Tinned-copper braid

Self-regulating conductive core
Nickel-plated copper bus wire

• Gutters made from standard materials, including metal,
plastic, and wood.
• Downspouts made from standard materials, including
metal and plastic.
The heating element in the IceStop heating cable consists of
a continuous core of conductive polymer extruded between
two copper bus wires. As current flows through the core,
the IceStop heating cable regulates its own heat output in
response to ambient conditions.

The IceStop heating cable is available with a fluoropolymer
outer jacket (-XT) that provides maximum abrasion,
chemical, and mechanical resistance; or a polyolefin outer
jacket (-X) that is more economical for less demanding
applications.

All of these characteristics simplify and streamline the
design of a roof and gutter de-icing system. Installation is
quick and simple. The same features that make an IceStop
system easy to install the first time also simplify additions or
changes to the system during building renovations.

Freezer Frost
Heave Prevention

Low installed cost
The IceStop heating cable’s parallel circuitry allows it to be
cut to the exact length required, with no wasted cable.

Surface Snow
Melting – ElectroMelt

This self-regulating feature eliminates hot spots and results
in better temperature control to protect roof and gutter
materials.

Surface Snow
Melting – MI

Modified polyolefin inner jacket

Roof and Gutter
De-Icing

Product Overview

Heating cable construction

Catalog Number
GM-2XT and GM-2X

12 W/ft (39 W/m) in ice or snow

120 Vac

208–277 Vac

0°F (–18°C)

Floor Heating

GM-1XT and GM-1X
Power Output (nominal)

Voltage

THERMAL MANAGEMENT SOLUTIONS

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Technical Data
Sheets

Minimum Installation Temperature

Icestop
Minimum Bend Radius
5/8 in (16 mm)

5/8 in (16 mm)

Maximum Circuit Length in Feet (Meters)
Circuit breaker size

Start-up
temperature
GM-1XT and GM-1X at 120 volts

GM-2XT and GM-2X at 208 volts

GM-2XT and GM-2X at 240 volts

GM-2XT and GM-2X at 277 volts

32°F

15 A

20 A

30 A

40 A*

(0°C)

100 (30)

135 (41)

200 (61)

—

20°F (–7°C)

95 (29)

125 (38)

185 (56)

200 (61)*

0°F (–18°C)

80 (24)

100 (30)

155 (47)

200 (61)*

32°F

(0°C)

190 (58)

250 (76)

380 (116)

20°F (–7°C)

180 (55)

235 (72)

355 (108)

380 (116)*

0°F (–18°C)

145 (44)

195 (59)

290 (88)

380 (116)*

32°F

(0°C)

200 (61)

265 (81)

400 (122)

20°F (–7°C)

190 (58)

250 (76)

370 (113)

400 (122)*

0°F (–18°C)

155 (47)

205 (62)

305 (93)

400 (122)*

32°F

—

(0°C)

215 (66)

290 (88)

415 (126)

20°F (–7°C)

200 (61)

265 (81)

400 (122)

415 (126)*

—

0°F (–18°C)

165 (50)

225 (69)

330 (101)

415 (126)*

* Only FTC-P power connection kits may be used with 40-A circuits.
Bus Wires
16 AWG nickel-plated copper
Braid / Outer Jacket
Tinned-copper braid with fluoropolymer (-XT) or modified polyolefin (-X) outer
jacket
Dimensions
Maximum width

0.54 in (14 mm)

Maximum thickness

0.24 in (6 mm)

Nominal Weight
92 lb/1000 ft (137 kg/1000 m)
Connection Kits
Raychem RayClic or FTC connection kits must be used with IceStop heating
cables. Refer to the Roof and Gutter De-Icing Design Guide (H56070) for proper
connection kit selection.
Approvals
877Z De-icing and
Snow-Melting
Equipment

Nonhazardous and Hazardous Locations
Class 1, Div. 2, Groups A, B, C, D*
* For GM-1XT and GM-2XT

-ws

The IceStop heating cables are UL Listed, CSA Certified, and FM Approved only when used
with the appropriate agency-approved Pentair Thermal Management connection kits and
accessories.

Ground-Fault Protection
To minimize the danger of fire from sustained electrical arcing if the heating
cable is damaged or improperly installed, and to comply with the requirements
of Pentair Thermal Management, agency certifications, and national electrical
codes, ground-fault equipment protection must be used on each heating cable
branch circuit. Arcing may not be stopped by conventional circuit protection.
Many DigiTrace control and monitoring systems meet the ground-fault protection
requirement.
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Pipe Freeze Protection
and Flow Maintenance
Fire Sprinkler System
Freeze Protection

ElectroMelt
Self-regulating surface snow-melting and
anti-icing heating cable
Raychem ElectroMelt provides surface snow melting and
anti-icing in concrete pavement.

Modified polyolefin
outer jacket
Tinned-copper braid

Self-regulating conductive core
Nickel-plated copper bus wire

Parallel circuitry
The crosslinked, conductive polymer core of the ElectroMelt
heating cable is extruded between two 14 AWG copper bus
wires, forming a parallel circuit. This allows ElectroMelt
heating cables to be cut to length and to be spliced and
repaired, if necessary, in the field.

EM2-XR

Power Output W/ft (W/m)

Voltage

EM3-XR

Power Output
W/ft (W/m)

208

30 (98)

240

32 (105)

277

34 (112)

Voltage
347

Power Output
W/ft (W/m)
24 (79)

Maximum width

0.75 in (19 mm)

0.70 in (17.8 mm)

Maximum thickness

0.38 in (10 mm)

0.31 in (7.9 mm)

0°F (–18°C)

Floor Heating

Dimensions

Freezer Frost
Heave Prevention

Catalog Number

Surface Snow
Melting – ElectroMelt

Rugged
Specifically designed for direct burial in concrete,
ElectroMelt heating cables are protected by a tinned-copper
braid encased in a 70-mil modified polyolefin outer jacket.
With no exposed metal parts to corrode, no cold leads to
fail, and no burnout due to overlaps or hot spots, rugged
ElectroMelt heating cable offers an ideal solution for all
types of concrete pavement snow melting and anti-icing.

Surface Snow
Melting – MI

Modified polyolefin inner jacket

Self-regulating
The polymer core of an ElectroMelt heating cable
automatically adjusts power output at every point along its
length in response to concrete pavement temperature. This
response characteristic eliminates burnouts caused by
overlapping cable and provides improved energy efficiency
without the need for special controls.

Roof and Gutter
De-Icing

Product Overview

Heating cable construction

Minimum Installation Temperature

Minimum Bend Radius

THERMAL MANAGEMENT SOLUTIONS

EN-RaychemElectroMeltSnowMelting-DS-H56831

2 in (50 m E-100-L-A m)

11/13

343

Technical Data
Sheets

2 in (50 mm)

Electromelt
Maximum Circuit Length for Startup at 20°F (–7°C) in Feet (Meters)
Heating cable supply voltage
Circuit breaker (A)

208 V

20
30

240 V

80 (24)

85 (26)

105 (32)

160 (49)

210 (64)

265 (81)

277 V

347 V

100 (31)

120 (37)

115 (35)

130 (40)

165 (50)

170 (52)

195 (59)

250 (76)

230 (70)

260 (79)

330 (101)

285 (87)

325 (99)

†

Maximum Circuit Length for Startup at 0°F (–18°C) in Feet (Meters)
Heating cable supply voltage
Circuit breaker (A)

208 V

240 V

277 V

347 V

75 (23)

80 (24)

90 (27)

107 (33)

100 (31)

110 (34)

120 (37)

148 (45)

145 (44)

160 (49)

180 (55)

225 (69)

200 (61)

210 (64)

240 (73)

288 (88)

245 (75)

265 (81)

300 (91)

†

† Not permitted
Bus Wires
14 AWG nickel-plated copper
Braid / Outer Jacket
Heavy tinned-copper braid encased in a 70-mil modified polyolefin outer jacket
Nominal Weight
180 lb/1000 ft (268 kg/1000 m)
Connection Kits
Raychem ElectroMelt connection kits must be used to terminate ElectroMelt
heating cables. Refer to the Surface Snow Melting and Anti-Icing Design Guide –
ElectroMelt (H53393) for proper connection kit selection.
Approvals
877Z De-icing and
Snow-melting
Equipment
(for EM2-XR only)

-w

The EM2-XR and EM3-XR heating cables are UL Listed and CSA Certified only
when used with the appropriate agency-approved Pentair Thermal
Management connection kits and accessories.

344

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11/13

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection
and Flow Maintenance
Fire Sprinkler System
Freeze Protection

Raysol
Self-regulating heating cable
For floor heating and frost heave prevention applications

The Raychem RaySol system is designed for the following floor
heating applications.

Fluoropolymer
outer jacket
Tinned-copper braid

Self-regulating conductive core
Nickel-plated copper bus wires

Comfort floor heating — warms concrete, tile, stone and
marble floors in lobbies, foyers, bathrooms, kitchens and
gymnasiums. The cable is typically embedded in a thick
mortar bed or concrete.
Radiant space heating – provides primary space heating for
rooms with concrete floors. The cable is typically embedded
in concrete or a thick mortar bed.

Pentair Thermal Management representatives can provide
design assistance and help you install the product that
meets your goals for an efficient, cost-effective floor heating
system.
Catalog Number

RAYSOL-1

RAYSOL-2

120 V

208–277 V

5/8 in (16 mm)

Floor Heating

Voltage

Minimum Bend Radius

EN-RaychemRaySol-DS-H56821

11/13

345

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Freezer Frost
Heave Prevention

Efficient and economical to operate
Because it’s self-regulating, a RaySol system will supply the
right heat only where and when it is needed. The radiant
heat provided by the RaySol heating cable allows you to feel
comfortable at lower air temperatures, resulting in lower
heating costs.

Surface Snow
Melting – ElectroMelt

Freezer frost heave prevention — prevents heaving in
soils under freezers, refrigerated warehouses, and cold
rooms. The cable is placed in conduit buried in soil or in the
subflooring under the freezer floor.

Surface Snow
Melting – MI

Modified polyolefin inner jacket

Heat-loss replacement — replaces heat in concrete floors
built over garages, loading docks, arcades, and other cold
spaces. The cable is typically attached to the bottom of
concrete floors.

Roof and Gutter
De-Icing

Product Overview

Heating cable construction

raysol
Maximum Circuit Length in Feet (Meters)
Circuit
breaker
rating (A)
Installed in conduit
(at 40°F start-up
temperature)

Surface mounted
(at 40°F start-up
temperature)

Embedded in concrete or
mortar (at 40°F start-up
temperature)

Cable operating voltage
120 V

208 V

240 V

277 V

180 (54.9)

305 (93.0)

335 (102.1)

375 (114.3)

240 (73.2)

410 (125.0)

450 (137.2)

500 (152.4)

240 (73.2)

410 ( 125.0)

450 (137.2)

500 (152.4)

240 (73.2)

410 (125.0)

450 (137.2)

500 (152.4)

120 (36.6)

205 (62.5)

210 (64.0)

215 (65.5)

160 (48.8)

275 (83.8)

285 (86.9)

290 (88.4)

240 (73.2)

410 (125.0)

425 (129.5)

430 (131.1)

240 (73.2)

410 (125.0)

425 (129.5)

430 (131.1)

80 (24.4)

135 (41.1)

140 (42.7)

145 (44.2)

105 (32.0)

185 (56.4)

195 (59.4)

160 (48.8)

275 (83.8)

280 (85.3)

290 (88.4)

170 (51.8)

280 (85.3)

320 (97.5)

360 (109.7)

Bus Wires
16 AWG nickel-plated copper
Braid / Outer Jacket
Tinned-copper braid with fluoropolymer outer jacket
Dimensions
Maximum width

0.56 in (14 mm)

Maximum thickness

0.24 in (6 mm)

Nominal Weight
92 lb/1000 ft (137 kg/1000 m)
Connection Kits
Raychem RayClic-E, FTC-P, FTC-XC, and FTC-HST connection kits must be used
to connect and to terminate RaySol heating cables. Refer to the Freezer Frost
Heave Prevention Design Guide (H58139) and the Floor Heating Design Guide
(H58157) for proper connection kit selection.
Approvals
9J86 Radiant
Heating Cable

-w

The RaySol system is UL Listed for heat loss replacement, comfort floor heating
and radiant space heating applications.
The RaySol system is CSA Certified for comfort floor heating and radiant
space heating applications. For heat loss replacement applications where the
cable is attached to the bottom of the concrete floor, contact Pentair Thermal
Management for additional information.
Ground-Fault Protection
To minimize the danger of fire from sustained electrical arcing if the heating
cable is damaged or improperly installed, and to comply with the requirements
of Pentair Thermal Management, agency certifications, and national electrical
codes, ground-fault equipment protection must be used on each heating cable
branch circuit. Arcing may not be stopped by conventional circuit protection.
Many DigiTrace control and monitoring systems meet the ground-fault protection
requirement.
346

EN-RaychemRaySol-DS-H56821

11/13

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection
and Flow Maintenance
Fire Sprinkler System
Freeze Protection

mi heating cable
Copper and HDPE jacketed copper sheathed MI cable
For commercial applications

Insulation
(magnesium oxide)

HDPE jacket
(optional)

Heating
conductor

Copper sheath

Single-conductor cable (61 series)

HDPE jacket
(optional)

Heating
conductors

For additional information or applications requiring stainless
steel sheathed heating cables, contact your Pentair Thermal
Management representative or call (800) 545-6258.

Surface Snow
Melting – MI

Insulation
(magnesium oxide)

The copper sheath provides an ideal ground path and allows
for a rugged yet flexible heating cable that is easy to install.
Each heating cable includes a heated section that is joined
to a preterminated nonheating cold lead which is ready
to connect into a junction box. For corrosive or embedded
applications, such as concrete or asphalt snow melting,
a cable with a high-density polyethylene (HDPE) jacket is
required. Refer to the tables below for the complete list of
approved applications.

Roof and Gutter
De-Icing

Product Overview

Heating cable construction

Copper sheath

Dual-conductor cable (32, 62 series)

Bare copper-sheathed heating cable

Max. power output
W/ft (W/m)

Snow melting on metal roofs

Yes

15 (49)

De-icing of metal gutters and downspouts

Yes

(49)

De-icing of nonmetallic gutters and downspouts

Yes

(16)

Freeze protection of metal pipes and vessels2

Yes

(59)

Process temperature maintenance (pipes and vessels)2

Yes

(59)

Yes

(99)
(82)

Freezer Frost
Heave Prevention

c-CSA-us

HDPE jacketed copper-sheathed heating cable
Snow melting in concrete and mastic asphalt slab

Yes

Snow melting in sand/limestone screenings (pavers)

Yes1

Yes

20 (66)

Snow melting on nonmetal roof

Yes

(26)

De-icing of metal gutters and downspouts

Yes

(26)

De-icing of nonmetallic gutters and downspouts

Yes

(16)

Floor heating in concrete slab

Yes

(33)

Frost heave prevention in sand under freezer or arena floor

Yes

(23)

Freeze protection of metal pipes and vessels – internal

Yes

(26)

Freeze protection of metal pipes and vessels – external

Yes

(26)

Freeze protection of nonmetallic pipes and vessels – internal

Yes

(13)

Freeze protection of nonmetallic pipes and vessels – external

Yes

(13)

Special permission for paver snow melting is required from the Authority Having Jurisdiction.
When designing heating cables for pipe and vessel tracing, the “Max. power output (W/ft)” values may have to be decreased to ensure that
the sheath temperature does not exceed the maximum exposure temperature (see page 2) of the cable.

THERMAL MANAGEMENT SOLUTIONS

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347

Technical Data
Sheets

Floor Heating

Snow melting in road-grade asphalt slab

Surface Snow
Melting – ElectroMelt

Approved Applications and Power Output for Nonhazardous Areas

mi heating cable for commercial applications
Approved Applications and Power Output for Hazardous Areas
Bare copper-sheathed heating cable

c-CSA-us

CSA

Max. power output
W/ft (W/m)

Process temperature maintenance (pipes and vessels)3

Yes

(59)

Freeze protection of metal pipes and vessels3

Yes

(59)

De-icing of metal gutters and downspouts

Yes

(49)

De-icing of nonmetallic gutters and downspouts

Yes

(16)

Snow melting in concrete and mastic asphalt slab

Yes

(99)

Snow melting in road-grade asphalt slab

Yes

(82)

De-icing of metal gutters and downspouts3

Yes

(26)

De-icing of nonmetallic gutters and downspouts

Yes

(16)

Frost heave prevention in sand under freezer or arena floor

Yes

(23)

Freeze protection of metal pipes and vessels – external

Yes

(26)

Freeze protection of nonmetallic pipes and vessels – external

Yes

(13)

HDPE jacketed copper-sheathed heating cable

3 When designing heating cables for pipe and vessel tracing, and de-icing of metal gutters and downspouts, the “Max. power output (W/

ft)” values may have to be decreased to ensure that the sheath temperature does not exceed the maximum exposure temperature of the
cable (see below) or the autoignition temperature of gases and vapors present in the hazardous area. For assistance designing heating
cables for hazardous areas, contact Pentair Thermal Management Technical Support at (800) 545-6258.

Maximum Exposure Temperature

392°F (200°C) Bare copper-sheathed heating cable
194°F (90°C) HDPE-jacketed heating cable*
* HDPE-sheathed cables may be exposed to higher temperatures during
installation in asphalt.
Temperature ID Number (T-Rating)

To be established by calculating the maximum sheath temperature. Contact
Pentair Thermal Management for assistance.
Basic Heating Cable Design Configurations

Heating cables are supplied as complete factory-fabricated assemblies consisting
of the heated section joined to a length of nonheating cold lead section,
preterminated with an NPT-threaded connector and ready to connect into a
junction box.
Design B

Design A
Heated length

Cold lead length

Design A: Single conductor cable (61 series only)

NPT threaded
connector

Heated length

Cold lead length

NPT threaded
connector

Design B: Single conductor cable (61 series only)

Design E

Design D
Heated length

Cold lead length

Design D: Dual conductor cable (32, 62 series only)

348

Cold lead length

NPT threaded
connector

Cold lead length

Heated length

Cold lead length

Design E: Dual conductor cable (32, 62 series only)

EN-PyrotenaxMIcommercial-DS-H56990

11/13

NPT threaded
connector

THERMAL MANAGEMENT SOLUTIONS

Heating Cable Catalog Number
To order an MI heating cable, it is
important to understand the format of our
catalog number.

B/61CE4600/150/1600/120/7/C25A/Y/N12

Pipe Freeze Protection
and Flow Maintenance

mi heating cable for commercial applications

Gland size

Fire Sprinkler System
Freeze Protection

Hot-cold joint “Y” is standard for copper
MI heating cables
Cold lead code
Cold lead length (in feet)
Heating cable voltage
Heating cable wattage
Heating cable length (in feet)
Heating cable reference
Heating cable configuration (A, B, D, E)

Options
Add suffix “/PE” at the end of the catalog number for pulling eye (Design D cables only).
Add suffix “/RG1” at the end of the catalog number for 1" reverse gland (used to make a watertight seal) for Designs A and D
cables. Design D cables also available with 1/2" or 3/4" reverse gland (“/RG34” for 3/4" or “/RG12” for 1/2").
Pipe tracing for 2 in x 50 ft pipe
1 cable D/32CD3800/52/340/120/3/C22A/Y/N12

• Heating cable configuration is Design B

• Heating cable configuration is Design D

• 600 V rated single conductor HDPE jacketed cable, resistance at 20°C is 0.150 Ω/ft (0.492 Ω/m)

• 300 V rated two conductor cable, resistance at 20°C is
0.80 Ω/ft (2.625 Ω/m)

• Each heating cable length is 343 ft (104.5 m)

• Heating cable length is 52 ft (15.9 m)

• Each heating cable wattage is 7000 W at 600 V

• Heating cable wattage is 340 W at 120 V

• Cold lead is 15 ft (4.5 m) with HDPE jacket

• Cold lead is 3 ft (0.9 m)

• Cold lead code is H25A

• Cold lead code is C22A

• 1/2-in NPT gland connector

Surface Snow
Melting – ElectroMelt

Snow melting for area 1200 sq ft (spacing 7")
6 cables B/61HE3150/343/7000/600/15/H25A/Y/N12

Surface Snow
Melting – MI

Examples

Heating Cable Reference Decoding
Digit number Description

Digit 1

2 3 4 5 6 7 8

Maximum voltage rating

3 = 300 V, 6 = 600 V

Number of conductors

1 or 2

Sheath material

C = Copper,
H = HDPE jacketed copper

Freezer Frost
Heave Prevention

61CD3610

Roof and Gutter
De-Icing

In the above heating cable catalog number, the length of the heated section and the cold lead are in feet. For metric lengths,
the heating cable catalog number would include a suffix “M” after the length, as shown below. A HDPE jacket on the heated
section and a HDPE jacket on the cold lead have also been included in the following:
B/61HE4600/45.7M/1600/120/2.1M/H25A/Y/N12

Conductor material

C, D, or E

Move decimal point to left indicated
number of places

1, 2, 3, 4, 5, or 6 places

6 to 8

Cable resistance (Ω/ft) to 3 whole numbers
(use with digit 5)

3610 = 0.610 Ω/cable foot at 20°C
Floor Heating

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349

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

mi heating cable for commercial applications
Cold Leads for Copper-Sheathed Heating Cables
Cold leads for copper MI heating cables are available in bare copper or for superior mechanical and corrosion
resistance HDPE jacketed copper. Use HDPE jacketed copper for all embedded heating cable applications, such as
snow melting and floor heating.
Bare copper cold lead
code

HDPE jacketed cold lead
code

Maximum
voltage (V)

C22A

H22A

600

C29A

H29A

600

Gland size
Gland size reference for
(NPT)
catalog number

Tail size
(AWG)

1/2"

N12

1/2"

N12

Maximum
current (A)

Design A, D, E

C38A

H38A

600

3/4"

N34

C50A

H50A

600

3/4"

N34

C67A

H67A

600

3/4"

N34

C90A

H90A

600

C25A

H25A

600

1/2"

N12

C30A

H30A

600

1/2"

N12

Design B

C40A

H40A

600

1/2"

N12

C60A

H60A

600

1/2"

N12

C80A

H80A

600

1/2"

N12

C105A

H105A

600

105

1/2"

N12

Series 61 MI Heating Cable Specifications (600 V, Single Conductor)
Heating cable
reference
61CD3610

Nom. cable resistance
at 20°C

Nominal cable
diameter

Max. unjointed cable
length

Nominal weight

Ω/ft

Ω/m

lb/1000 ft kg/1000 m

0.610

2.00

0.120

3.0

11712

3571

52.1

61CD3390

0.390

1.28

0.132

3.4

9689

2954

67.0

61CD3300

0.300

0.984

0.160

4.1

6595

2011

67.0

61CD3200

0.200

0.656

0.168

4.3

5987

1825

83.3

61CE3150

0.150

0.492

0.148

3.8

7718

2353

72.9

61CE3105

0.105

0.344

0.174

4.4

5230

1594

77.4

61CE4800

0.0800

0.262

0.182

4.6

4948

1508

80.4

61CE4600

0.0600

0.197

0.194

4.9

4269

1301

83.3

61CE4400

0.0400

0.131

0.185

4.7

4686

1429

86.2

61CE4300

0.0300

0.0980

0.192

4.9

4340

1323

96.6

61CE4200

0.0200

0.0660

0.205

5.2

3564

1086

110.2

61CC4100

0.0100

0.0328

0.198

5.0

4624

1409

86.3

61CC5651

0.00651

0.0214

0.194

4.9

4187

1277

99.7

61CC5409

0.00409

0.0134

0.223

5.7

3394

1034

125.2

61CC5258

0.00258

0.00846

0.230

5.8

3076

938

146.1

61CC5162

0.00162

0.00531

0.246

6.2

2693

821

117

174.2

61CC5102

0.00102

0.00335

0.277

7.0

2056

627

154

229.1

61CC6641

0.000641

0.00210

0.298

7.6

1688

515

179

266.3

61CC6403

0.000403

0.00132

0.340

8.6

1331

406

236

351.1

Notes: 1) To specify an HDPE jacket on the heating cable, replace the C (first letter in reference) with H.
Example: 61CD3610 becomes 61HD3610 for jacketed version.

2) Tolerance on cable resistance is ± 10%.

350

EN-PyrotenaxMIcommercial-DS-H56990

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THERMAL MANAGEMENT SOLUTIONS

Series 32 MI Heating Cable Specifications (300 V, Dual Conductor)
Heating cable
reference

Nom. cable resistance
at 20°C

Nominal cable
diameter

Max. unjointed cable
length

Nominal weight

Ω/ft

lb/1000 ft kg/1000 m

Ω/m

0.800

2.62

0.165

4.2

5800

1768

68.5

0.600

1.97

0.175

4.4

5676

1730

87.8

32CD3400

0.400

1.31

0.183

4.6

4686

1428

89.4

32CD3300

0.300

0.984

0.190

4.8

4158

1267

92.1

32CE3200

0.200

0.656

0.185

4.7

4686

1428

89.4

32CE3125

0.125

0.410

0.195

5.0

4026

1227

96.6

32CE3100

0.100

0.328

0.208

5.3

3564

1086

96.6

0.0700

0.230

5.8

3300

1006

110

163.7

0.0440

0.144

0.260

6.6

2244

684

140

208.2

32CE4280

0.0280

0.092

0.300

7.6

1782

543

182

270.8

Roof and Gutter
De-Icing

32CE4700
32CE4440

Fire Sprinkler System
Freeze Protection

32CD3800
32CD3600

Pipe Freeze Protection
and Flow Maintenance

mi heating cable for commercial applications

Notes: 1) To specify a HDPE jacket on the heating cable, replace the C (first letter in reference) with H.
Example: 32CD3800 becomes 32HD3800 for jacketed version.

2) Tolerance on cable resistance is ± 10%.
Series 62 MI Heating Cable Specifications (600 V, Dual Conductor)
Max. unjointed cable
length

Nominal weight

Ω/ft

Ω/m

lb/1000 ft kg/1000 m

62CE4950

0.0950

0.312

0.283

7.2

1890

576

129

192

62CE4700

0.0700

0.230

0.309

7.9

1400

427

150

223.2

62CE4440

0.0440

0.144

0.340

8.6

1170

357

181

269.4

62CE4280

0.0280

0.0920

0.371

9.4

965

294

224

333.8

62CC4200

0.0200

0.0656

0.290

7.4

2046

624

140

208.3

62CC4130

0.0130

0.0427

0.309

7.9

1647

502

150

223.2

62CC5818

0.00818

0.0268

0.340

8.6

1217

371

189

281.2

62CC5516

0.00516

0.0169

0.371

9.4

1062

324

236

351.1

62CC5324

0.00324

0.0106

0.402

10.2

876

267

275

409.1

62CC5204

0.00204

0.00669

0.449

11.4

706

215

353

525.3

Heating cable
reference

Surface Snow
Melting – ElectroMelt

Nominal cable
diameter

Freezer Frost
Heave Prevention

Notes: 1) To specify a HDPE jacket on the heating cable, replace the C (first letter in reference) with H.
Example: 62CE4950 becomes 62HE4950 for jacketed version.

2) Tolerance on cable resistance is ± 10%.

Resistance Correction Factor
Various conductor materials behave differently. Based on the application, use
the table or graphs below for approximate adjustment of power and resistance
as a function of temperature. For detailed design, contact Pentair Thermal
Management for further assistance.

1.15

1.0

E
D

0.5
32
122
212
302 392°F
0
50
100
150 200°C
Pipe Temperature to be Maintained

EN-PyrotenaxMIcommercial-DS-H56990

11/13

1.5

1.0

E
D

0.5
–58
32
122
212 302°F
–50
0
50
100 150°C
Pipe Temperature to be Maintained

351

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

1.5

Resistance Multiplier for
Conductor Materials

Correction
factor

Resistance Multiplier for
Conductor Materials

Conductor
material

Applications: Freeze protection for pipes and vessels, process temperature maintenance for pipes
and vessels
Power On
Power Off
2.0
2.0
C

Floor Heating

Applications: Snow melting, floor warming,
roof and gutter de-icing, frost-heave prevention

Surface Snow
Melting – MI

Nom. cable resistance
at 20°C

mi heating cable for commercial applications
Approvals
Also refer to application tables on
previous pages

Nonhazardous Locations
Hazardous Locations
Class I, Div 1 & 2, Groups A*, B, C, D
Class II, Div 1 & 2, Groups E, F, G
Class III

Nonhazardous Locations
Hazardous Locations
Class I, Div 1 & 2, Groups A, B, C, D
Class II, Div 1 & 2, Groups E, F, G
Class III

* HDPE jacket is required for
FM Group A approval
Nonhazardous Locations
421H

352

EN-PyrotenaxMIcommercial-DS-H56990

11/13

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection
and Flow Maintenance
Fire Sprinkler System
Freeze Protection

MI Heating Cable
HDPE jacketed, copper and Alloy 825 sheathed MI cable
For freezer frost heave prevention applications

Type SUA
Design A

Heated length

Cold lead length
Hot/cold
joint

Heated length Cold lead length
Hot/cold
joint

NPT
threaded
connector

Type FFHPC
Design D
Cold lead length

Heated length

Reversed
gland

Hot/cold
joint

Type FFHPC heating cables are suitable for applications
where the cable is installed in conduit. These heating cables
are supplied with a copper sheathed cold lead and a heated
length made with either Alloy 825 or a copper sheath with an
extruded HDPE jacket.
MI heating cables for frost heave prevention applications are
supplied as complete factory fabricated assemblies ready
to fasten into a junction box. The copper or Alloy 825 sheath
allows for a rugged yet flexible heating cable which is easy
to install.
For additional information, contact your Pentair Thermal
Management representative or call (800) 545-6258.

Surface Snow
Melting – ElectroMelt

Pulling eye

Types SUA, SUB, and FFHP heating cables have a copper
sheath that is extruded with high-density polyethylene
(HDPE) jacket and are suitable for applications where the
cable is directly embedded in the subfloor.

NPT threaded
connector

Cable Construction
Type SUA, SUB and FFHP heating cable
Seamless copper

Jacket

HDPE

Insulation

Magnesium oxide

Conductor type

Alloy or copper

Number of conductors

Insulation voltage rating

600 V

Cable diameter (with jacket)

0.20 to 0.303 in (5.1 to 7.7 mm)

Freezer Frost
Heave Prevention

Sheath

Surface Snow
Melting – MI

Type SUB and FFHP
Design B
Cold lead length

NPT
threaded
connector

Roof and Gutter
De-Icing

Product Overview

MI Heating Cable Configuration

Type FFHPC heating cable
Alloy 825 or seamless copper

Jacket (for copper sheath cables)

HDPE

Insulation

Magnesium oxide

Conductor type

Alloy

Number of conductors

Insulation voltage rating

300 V

Floor Heating

Sheath

Cable diameter
0.130 to 0.174 in (3.3 to 4.4 mm)
0.245 to 0.270 in (6.2 to 6.9 mm)

THERMAL MANAGEMENT SOLUTIONS

EN-PyrotenaxMIFreezerFrostHeavePrevention-DS-H58207

11/13

353

Technical Data
Sheets

Alloy 825 sheath
Copper sheath (with jacket)

mi heating cable for freezer frost heave prevention
Cable Construction
Cold lead
Sheath

Seamless copper

Jacket (Type SUA/SUB/FFHP cables)

HDPE

Insulation

Magnesium oxide

Conductor type

Copper

Number of conductors

1 or 2

Insulation voltage rating

600 V

Cable diameter
With jacket

0.310 to 0.420 in (7.9 to 10.7 mm)

Without jacket (Type FFHPC)

0.371 in (9.4 mm)

Gland size (NPT)

1/2 in

Tail length

12 in (30 cm)

Reversed gland size (Type FFHPC)

3/4 in NPT

Minimum Installation Temperature
–4°F (–20°C)
Minimum Bending Radius
6 times cable diameter
SUA/SUB Heating Cable Specifications
Catalog
number

Heating
cable
Design reference

Heated length
(ft)

(m)

Nominal Cable
power voltage
(watts) (volts)

Cold lead
length 1
(ft)

(m)

Cold
lead
code

Joint
type

Nominal heating
cable diameter
(in)

(mm)

Resistance 2
(ohms)

6.3

28.0

120 Volts and 208 Volts, 3-phase Wye
SUA3

61HD3200

140

42.7

500

120

2.1 H22A

0.248

SUA4

61HD3390

20.7

550

120

2.1 H22A

0.212

5.4

27.0

SUA7

61HD3200

29.0

750

120

2.1 H22A

0.248

6.3

18.8

SUA8

61HE3105

177

53.9

800

120

2.1 H22A

0.254

6.5

18.0

SUB1

61HE3105

132

40.2

1000

120

4.6 H25A

0.254

6.5

14.0

SUB2

61HE4600

240

73.1

1000

120

4.6 H25A

0.274

7.0

14.5

SUB3

61HE4400

280

85.3

1300

120

4.6 H30A

0.265

6.7

11.2

SUB4

61HE4300

320

97.5

1500

120

4.6 H30A

0.272

6.9

9.6

SUB5

61HE4300

260

79.2

1800

120

4.6 H40A

0.272

6.9

7.9

SUB6

61HE4200

375

114.3

1900

120

4.6 H40A

0.285

7.2

7.5

SUB7

61HE4200

310

94.5

2300

120

4.6 H40A

0.285

7.2

6.2

SUB8

61HC4100

550

167.6

2300

120

4.6 H60A

0.278

7.1

6.4

SUB9

61HC5651

630

192.0

3000

120

4.6 H60A

0.274

7.0

4.7

SUB10

61HC5409

717

218.5

4300

120

4.6 H80A

0.303

7.7

3.4

208 Volts
SUA1

61HD3610

108

32.9

650

208

2.1 H22A

0.200

5.1

65.9

SUA6

61HE3105

264

80.5

1560

208

2.1 H22A

0.254

6.5

27.7

SUB19

61HD3200

245

74.7

885

208

4.6 H25A

0.248

6.3

49.0

SUB20

61HE3105

340

103.6

1210

208

4.6 H25A

0.254

6.5

35.7

SUB21

61HE4600

440

134.1

1640

208

4.6 H25A

0.274

7.0

26.5

SUB22

61HE4400

525

160.0

2060

208

4.6 H25A

0.265

6.7

20.9

1 To modify cold lead length, contact your Pentair Thermal Management sales representative.
2 Resistance tolerance: +/– 10%
Tolerance on heating cable length: -0% to +3%
354

EN-PyrotenaxMIFreezerFrostHeavePrevention-DS-H58207

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THERMAL MANAGEMENT SOLUTIONS

SUA/SUB Heating Cable Specifications
Heated length
(ft)

(m)

Nominal Cable
power voltage
(watts) (volts)

Cold lead
length 1
(ft)

(m)

Cold
lead
code

Nominal heating
cable diameter

Joint
type

(in)

(mm)

Resistance 2
(ohms)

240 Volts
SUB19

61HD3200

245

74.7

1175

240

4.6 H25A

0.248

6.3

49.0

SUB20

61HE3105

340

103.6

1615

240

4.6 H25A

0.254

6.5

35.7

SUB21

61HE4600

440

134.1

2180

240

4.6 H25A

0.274

7.0

26.5

SUB22

61HE4400

525

160.0

2745

240

4.6 H25A

0.265

6.7

20.9

Fire Sprinkler System
Freeze Protection

Catalog
number

Heating
cable
Design reference

Pipe Freeze Protection
and Flow Maintenance

mi heating cable for freezer frost heave prevention

277 Volts and 480 Volts, 3-phase Wye
B

61HD3200

245

74.7

1565

277

4.6 H25A

0.248

6.3

49.0

SUB20

61HE3105

340

103.6

2150

277

4.6 H25A

0.254

6.5

35.7

SUB21

61HE4600

440

134.1

2900

277

4.6 H25A

0.274

7.0

26.5

SUB22

61HE4400

525

160.0

3650

277

4.6 H25A

0.265

6.7

20.9

Roof and Gutter
De-Icing

SUB19

347 Volts and 600 Volts, 3-phase Wye
B

61HD3390

225

68.6

1400

347

4.6 H25A

0.212

5.4

87.8

SUB12

61HD3200

310

94.5

1950

347

4.6 H25A

0.248

6.3

62.1

SUB13

61HE3105

428

130.5

2700

347

4.6 H25A

0.254

6.5

45.0

SUB14

61HE4600

548

167.0

3700

347

4.6 H25A

0.274

7.0

32.7

Surface Snow
Melting – MI

SUB11

1 To modify cold lead length, contact your Pentair Thermal Management sales representative.
2 Resistance tolerance: +/– 10%
Tolerance on heating cable length: -0% to +3%
FFHP Heating Cable Specifications
Heated length
(ft)

(m)

Nominal Cable
power voltage
(watts) (volts)

Cold lead
length1
(ft)

(m)

Cold
lead Joint
code type

Nominal heating
cable diameter
(in)

(mm)

Resistance2
(ohms)

120 Volts and 208 Volts, 3-phase Wye
61HD3610

17.7

405

120

4.6

H25A

0.200

5.1

35.6

61HD3390

22.0

510

120

4.6

H25A

0.212

5.4

28.2

FFHP3

61HD3300

25.3

580

120

4.6

H25A

0.240

6.1

24.8

FFHP4

61HD3200

102

31.1

705

120

4.6

H25A

0.248

6.3

20.4

FFHP5

61HE3150

117

35.7

820

120

4.6

H25A

0.228

5.8

17.6

FFHP6

61HE3105

140

42.7

980

120

4.6

H25A

0.254

6.5

14.7

FFHP7

61HE4800

160

48.8

1125

120

4.6

H25A

0.262

6.7

12.8

FFHP8

61HE4600

185

56.4

1300

120

4.6

H25A

0.274

7.0

11.1

FFHP9

61HE4400

226

68.9

1590

120

4.6

H25A

0.265

6.7

9.1

FFHP10

61HE4300

262

79.9

1830

120

4.6

H25A

0.272

6.9

7.9

FFHP11

61HE4200

320

97.6

2250

120

4.6

H25A

0.285

7.2

6.4

FFHP12

61HC4100

426

129.9

2965

120

4.6

H30A

0.278

7.1

4.9

FFHP13

61HC5651

528

161.0

3675

120

4.6

H40A

0.274

7.0

3.9

FFHP14

61HC5409

664

202.4

4650

120

4.6

H40A

0.303

7.7

3.1

Floor Heating

FFHP2

Freezer Frost
Heave Prevention

FFHP1

1 To modify cold lead length, contact your Pentair Thermal Management sales representative.
2 Resistance tolerance: +/– 10%
Tolerance on heating cable length: -0% to +3%

EN-PyrotenaxMIFreezerFrostHeavePrevention-DS-H58207

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355

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Surface Snow
Melting – ElectroMelt

Heating
Catalog
cable
number Design reference

mi heating cable for freezer frost heave prevention
FFHP Heating Cable Specifications
Heating
Catalog
cable
number Design reference

Heated length
(ft)

(m)

Nominal Cable
power voltage
(watts) (volts)

Cold lead
length1
(ft)

(m)

Cold
lead Joint
code type

Nominal heating
cable diameter
(in)

(mm)

Resistance2
(ohms)

208 Volts
FFHP15

61HD3610

101

30.8

700

208

4.6

H25A

0.200

5.1

61.8

FFHP16

61HD3390

126

38.4

880

208

4.6

H25A

0.212

5.4

49.2

FFHP17

61HD3300

144

43.9

1000

208

4.6

H25A

0.240

6.1

43.3

FFHP18

61HD3200

176

53.7

1230

208

4.6

H25A

0.248

6.3

35.2

FFHP19

61HE3150

203

61.9

1420

208

4.6

H25A

0.228

5.8

30.5

FFHP20

61HE3105

243

74.1

1700

208

4.6

H25A

0.254

6.5

25.4

FFHP21

61HE4800

278

84.8

1945

208

4.6

H25A

0.262

6.7

22.2

FFHP22

61HE4600

320

97.6

2250

208

4.6

H25A

0.274

7.0

19.2

FFHP23

61HE4400

394

120.1

2745

208

4.6

H25A

0.265

6.7

15.8

FFHP24

61HE4300

455

138.7

3170

208

4.6

H25A

0.272

6.9

13.7

FFHP25

61HE4200

557

169.8

3885

208

4.6

H25A

0.285

7.2

11.1

240 Volts
FFHP26

61HD3610

116

35.4

815

240

4.6

H25A

0.200

5.1

70.7

FFHP27

61HD3390

145

44.2

1020

240

4.6

H25A

0.212

5.4

56.5

FFHP28

61HD3300

166

50.6

1160

240

4.6

H25A

0.240

6.1

49.7

FFHP29

61HD3200

203

61.9

1420

240

4.6

H25A

0.248

6.3

40.6

FFHP30

61HE3150

234

71.3

1640

240

4.6

H25A

0.228

5.8

35.1

FFHP31

61HE3105

279

85.1

1965

240

4.6

H25A

0.254

6.5

29.3

FFHP32

61HE4800

320

97.6

2250

240

4.6

H25A

0.262

6.7

25.6

FFHP33

61HE4600

370

112.8

2600

240

4.6

H25A

0.274

7.0

22.2

FFHP34

61HE4400

452

137.8

3185

240

4.6

H25A

0.265

6.7

18.1

FFHP35

61HE4300

522

159.1

3680

240

4.6

H25A

0.272

6.9

15.7

FFHP36

61HE4200

640

195.1

4500

240

4.6

H25A

0.285

7.2

12.8

277 Volts and 480 Volts, 3-phase Wye
FFHP37

61HD3610

134

40.9

940

277

4.6

H25A

0.200

5.1

81.6

FFHP38

61HD3390

168

51.2

1170

277

4.6

H25A

0.212

5.4

65.6

FFHP39

61HD3300

191

58.2

1340

277

4.6

H25A

0.240

6.1

57.3

FFHP40

61HD3200

234

71.3

1640

277

4.6

H25A

0.248

6.3

46.8

FFHP41

61HE3150

270

82.3

1895

277

4.6

H25A

0.228

5.8

40.5

FFHP42

61HE3105

322

98.2

2270

277

4.6

H25A

0.254

6.5

33.8

FFHP43

61HE4800

370

112.8

2590

277

4.6

H25A

0.262

6.7

29.6

FFHP44

61HE4600

426

129.9

3000

277

4.6

H25A

0.274

7.0

25.6

FFHP45

61HE4400

525

160.1

3655

277

4.6

H25A

0.265

6.7

21.0

FFHP46

61HE4300

603

183.8

4240

277

4.6

H25A

0.272

6.9

18.1

FFHP47

61HE4200

740

225.6

5185

277

4.6

H25A

0.285

7.2

14.8

1 To modify cold lead length, contact your Pentair Thermal Management sales representative.
2 Resistance tolerance: +/– 10%
Tolerance on heating cable length: -0% to +3%

356

EN-PyrotenaxMIFreezerFrostHeavePrevention-DS-H58207

11/13

THERMAL MANAGEMENT SOLUTIONS

FFHP Heating Cable Specifications
Heated length
(ft)

(m)

Nominal Cable
power voltage
(watts) (volts)

Cold lead
length1
(ft)

(m)

Cold
lead Joint
code type

Nominal heating
cable diameter
(in)

(mm)

Resistance2
(ohms)

347 Volts and 600 Volts, 3-phase Wye
FFHP48

61HD3610

168

51.2

1175

347

4.6

H25A

0.200

5.1

102.5

FFHP49

61HD3390

210

64.0

1470

347

4.6

H25A

0.212

5.4

81.9

FFHP50

61HD3300

239

72.9

1680

347

4.6

H25A

0.240

6.1

71.7

FFHP51

61HD3200

294

89.6

2050

347

4.6

H25A

0.248

6.3

58.7

FFHP52

61HE3150

338

103.0

2375

347

4.6

H25A

0.228

5.8

50.7

61HE3105

405

123.5

2830

347

4.6

H25A

0.254

6.5

42.5

61HE4800

465

141.8

3240

347

4.6

H25A

0.262

6.7

37.2

FFHP55

61HE4600

535

163.1

3750

347

4.6

H25A

0.274

7.0

32.1

FFHP56

61HE4400

655

199.7

4600

347

4.6

H25A

0.265

6.7

26.2

FFHP57

61HE4300

755

230.2

5315

347

4.6

H25A

0.272

6.9

22.7

Roof and Gutter
De-Icing

FFHP53
FFHP54

Fire Sprinkler System
Freeze Protection

Heating
Catalog
cable
number Design reference

Pipe Freeze Protection
and Flow Maintenance

mi heating cable for freezer frost heave prevention

1 To modify cold lead length, contact your Pentair Thermal Management sales representative.
2 Resistance tolerance: +/– 10%
Tolerance on heating cable length: -0% to +3%

Catalog
number

Heating
cable
Design reference

Heating length
(ft)

(m)

Nominal Cable
power voltage
(watts) (volts)

Cold lead
length 1
(ft)

(m)

Cold
lead
code

Joint
type

Nominal heating
cable diameter
(in)

(mm)

Resistance 2
(ohms)

Surface Snow
Melting – MI

FFHPC Heating Cable Specifications

120 Volts
15

4.6

105

120

2.1

C22A

0.140

3.6

137.1

32SA2600

6.1

120

2.1

C22A

0.135

3.4

120.0

FFHPC3

32SA2400

7.6

145

120

2.1

C22A

0.146

3.7

99.3

FFHPC4

32SA2275

9.1

175

120

2.1

C22A

0.153

3.9

82.3

FFHPC5

32SA2170

10.7

240

120

2.1

C22A

0.167

4.2

60.0

FFHPC6

32SB2114

12.2

315

120

2.1

C22A

0.174

4.4

45.7

FFHPC7

32SB2114

13.7

280

120

2.1

C22A

0.174

4.4

51.4

FFHPC8

32HD3800

15.2

360

120

2.1

C22A

0.245

6.2

40.0

FFHPC9

32HD3800

16.8

330

120

2.1

C22A

0.245

6.2

43.6

FFHPC10

32HD3600

18.3

400

120

2.1

C22A

0.255

6.5

36.0

FFHPC11

32HD3600

19.8

370

120

2.1

C22A

0.255

6.5

38.9

FFHPC12

32HD3400

21.3

515

120

2.1

C22A

0.263

6.7

28.0

FFHPC13

32HD3400

22.9

480

120

2.1

C22A

0.263

6.7

30.0

FFHPC14

32HD3400

24.4

450

120

2.1

C22A

0.263

6.7

32.0

FFHPC15

32HD3300

25.9

565

120

2.1

C22A

0.270

6.9

25.5

FFHPC16

32HD3300

27.4

535

120

2.1

C22A

0.270

6.9

26.9

FFHPC17

32HE3200

29.0

750

120

2.1

C22A

0.270

6.9

19.2

FFHPC18

32HE3200

100

30.5

720

120

2.1

C22A

0.265

6.7

20.0

Floor Heating

32SF2900

Freezer Frost
Heave Prevention

FFHPC2

Surface Snow
Melting – ElectroMelt

FFHPC1

1 To modify cold lead length, contact your Pentair Thermal Management sales representative.
2 Resistance tolerance: +/– 10%
Tolerance on heating cable length: –0% to +3%
Type FFHPC cables supplied with a 3/4 in NPT reversed gland connector and pulling eye.

EN-PyrotenaxMIFreezerFrostHeavePrevention-DS-H58207

11/13

357

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

mi heating cable for freezer frost heave prevention
FFHPC Heating Cable Specifications
Catalog
number

Heating
cable
Design reference

Heating length
(ft)

(m)

Nominal Cable
power voltage
(watts) (volts)

Cold lead
length 1
(ft)

(m)

Cold
lead
code

Joint
type

Nominal heating
cable diameter
(in)

(mm)

Resistance 2
(ohms)

208 Volts
FFHPC19

32SF1110

7.6

155

208

2.1

C22A

0.130

3.3

279.1

FFHPC20

32SF2750

9.1

190

208

2.1

C22A

0.157

4.0

227.7

FFHPC21

32SA2600

10.7

205

208

2.1

C22A

0.135

3.4

211.0

FFHPC22

32SA2400

12.2

270

208

2.1

C22A

0.146

3.7

160.2

FFHPC23

32SA2275

13.7

350

208

2.1

C22A

0.153

3.9

123.8

FFHPC24

32SA2275

15.2

315

208

2.1

C22A

0.153

3.9

137.5

FFHPC25

32SA2200

16.8

390

208

2.1

C22A

0.169

4.3

110.9

FFHPC26

32SA2170

18.3

425

208

2.1

C22A

0.167

4.2

101.8

FFHPC27

32SA2170

19.8

390

208

2.1

C22A

0.167

4.2

110.9

FFHPC28

32SB2114

21.3

540

208

2.1

C22A

0.174

4.4

80.1

FFHPC29

32SB2114

22.9

505

208

2.1

C22A

0.174

4.4

85.7

FFHPC30

32SB2114

24.4

475

208

2.1

C22A

0.174

4.4

91.1

FFHPC31

32HD3800

25.9

635

208

2.1

C22A

0.245

6.2

68.1

FFHPC32

32HD3800

27.4

600

208

2.1

C22A

0.245

6.2

72.1

FFHPC33

32HD3800

29.0

570

208

2.1

C22A

0.245

6.2

75.9

FFHPC34

32HD3600

100

30.5

720

208

2.1

C22A

0.255

6.5

60.1

FFHPC35

32SF1110

9.1

230

277

2.1

C22A

0.130

3.3

333.6

FFHPC36

32SF2900

10.7

240

277

2.1

C22A

0.140

3.6

319.7

FFHPC37

32SF2750

12.2

255

277

2.1

C22A

0.157

4.0

300.9

FFHPC38

32SA2600

13.7

285

277

2.1

C22A

0.135

3.4

269.2

FFHPC39

32SA2400

15.2

380

277

2.1

C22A

0.146

3.7

201.9

FFHPC40

32SA2400

16.8

350

277

2.1

C22A

0.146

3.7

219.2

FFHPC41

32SA2275

18.3

465

277

2.1

C22A

0.153

3.9

165.0

FFHPC42

32SA2275

19.8

430

277

2.1

C22A

0.153

3.9

178.4

FFHPC43

32SA2275

21.3

400

277

2.1

C22A

0.153

3.9

191.8

FFHPC44

32SA2200

22.9

500

277

2.1

C22A

0.169

4.3

153.5

FFHPC45

32SA2200

24.4

480

277

2.1

C22A

0.169

4.3

159.9

FFHPC46

32SA2170

25.9

530

277

2.1

C22A

0.167

4.2

144.8

FFHPC47

32SA2170

27.4

500

277

2.1

C22A

0.167

4.2

153.5

FFHPC48

32SB2114

29.0

700

277

2.1

C22A

0.174

4.4

109.6

FFHPC49

32SB2114

100

30.5

670

277

2.1

C22A

0.174

4.4

114.5

277 Volts

EN-PyrotenaxMIFreezerFrostHeavePrevention-DS-H58207

11/13

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection
and Flow Maintenance
Fire Sprinkler System
Freeze Protection

MI Heating Cable
HDPE jacketed, copper sheathed MI cable
For surface snow melting in concrete, asphalt, and pavers

Type SUA
Heated length

Cold lead length

NPT threaded
connector

Heated length

Cold lead length

For additional information, contact your Pentair Thermal
Management representative or call (800) 545-6258.

Surface Snow
Melting – MI

The copper sheath provides an ideal ground path and allows
for a rugged yet flexible heating cable that is easy to install.

Type SUB
Cold lead length

The copper-sheathed, mineral insulated heating cables are
covered with an extruded high-density polyethylene (HDPE)
jacket and are supplied as complete factory-assembled
cables ready to connect to a junction box. The series-type
technology, inherent to all mineral insulated heating cables,
provides a reliable and consistent heat source that is ideal
for embedded snow melting applications.

Roof and Gutter
De-Icing

Product Overview

MI Heating Cable Configuration

NPT threaded
connector

Cable Construction
Surface Snow
Melting – ElectroMelt

Heating cable
HDPE

Sheath

Seamless copper

Insulation

Magnesium oxide

Conductor type

Alloy or copper

Number of conductors

Insulation voltage rating

600 V

Cable diameter (with jacket)

0.200 to 0.303 in (5.1 to 7.7 mm)

Freezer Frost
Heave Prevention

Jacket

Cold lead
HDPE

Sheath

Seamless copper

Insulation

Magnesium oxide

Conductor type

Copper

Number of conductors

1 or 2

Insulation voltage rating

600 V

Cable diameter (with jacket)

0.310 to 0.420 in (7.9 to 10.7 mm)

Gland size (NPT)

1/2 in

Tail length

12 in (30 cm)

Floor Heating

Jacket

Minimum installation temperature
–4°F (–20°C)

6 times cable diameter

THERMAL MANAGEMENT SOLUTIONS

EN-PyrotenaxMISurfaceSnowMelting-DS-H57796

11/13

359

Technical Data
Sheets

Minimum bending radius

mi heating cable for surface snow melting
SUA/SUB Heating Cable Specifications
Catalog
number

Heating
Nominal Cable Cold lead
1
Heated
length
Config- cable
power voltage length
uration reference (ft)
(m) (watts) (volts) (ft) (m)

Nominal cable
Cold
diameter
lead Joint
code type
(in)
(mm)

Resis- Tail
tance2 size
(ohms) (AWG)

120 Volts
SUA5

61HD3610 40

12.2 550

120

2.1 H22A

0.200 5.1

26.2

SUA9

61HD3200 66

20.1 1100

120

2.1 H22A

0.248 6.3

13.1

61HD3390 68

20.7 1600

208

2.1 H22A

0.212 5.4

27.0

SUA7

61HD3200 95

29.0 2300

208

2.1 H22A

0.248 6.3

18.8

SUB1

61HE3105 132 40.2 3100

208

4.6 H25A

0.254 6.5

14.0

SUB3

61HE4400 280 85.3 3900

208

4.6 H30A

0.265 6.7

11.2

SUB5

61HE4300 260 79.2 5500

208

4.6 H40A

0.272 6.9

7.9

SUB7

61HE4200 310 94.5 7000

208

4.6 H40A

0.285 7.2

6.2

SUB9

61HC5651 630 192.0 9000

208

4.6 H60A

0.274 7.0

4.7

SUB10

61HC5409 717 218.5 13000

208

4.6 H80A

0.303 7.7

3.4

SUB1402

61HD3610 50

15.2 1400

208

4.6 H25A

0.232 5.9

30.9

SUB1702

61HD3390 64

19.5 1700

208

4.6 H25A

0.242 6.1

25.4

SUB2002

61HD3300 72

22.0 2000

208

4.6 H25A

0.240 6.1

21.6

SUB2402

61HD3200 90

27.4 2400

208

4.6 H25A

0.248 6.3

18.0

SUB2802

61HE3150 103 31.4 2800

208

4.6 H25A

0.250 6.4

15.5

SUB3402

61HE3105 121 36.9 3400

208

4.6 H25A

0.254 6.5

12.7

SUB3902

61HE4800 139 42.4 3900

208

4.6 H25A

0.262 6.7

11.1

SUB4502

61HE4600 160 48.8 4500

208

4.6 H25A

0.274 7.0

9.6

SUB5502

61HE4400 197 60.1 5500

208

4.6 H30A

0.265 6.7

7.9

SUB6402

61HE4300 226 68.9 6400

208

4.6 H40A

0.272 6.9

6.8

SUB7802

61HE4200 277 84.5 7800

208

4.6 H40A

0.285 7.2

5.5

SUB10302

61HC4100 368 112.2 10300

208

4.6 H60A

0.278 7.1

4.2

SUB12802

61HC5651 455 138.7 12800

208

4.6 H80A

0.274 7.0

3.4

SUB16102

61HC5409 576 175.6 16100

208

4.6 H80A

0.303 7.7

2.7

SUA3

61HD3200 140 42.7 2000

240

2.1 H22A

0.248 6.3

28.0

SUA8

61HE3105 177 53.9 3200

240

2.1 H22A

0.254 6.5

18.0

SUB2

61HE4600 240 73.1 4000

240

4.6 H25A

0.274 7.0

14.5

SUB3

61HE4400 280 85.3 5200

240

4.6 H30A

0.265 6.7

11.2

SUB4

61HE4300 320 97.5 6000

240

4.6 H30A

0.272 6.9

9.6

SUB5

61HE4300 260 79.2 7350

240

4.6 H40A

0.272 6.9

7.9

SUB6

61HE4200 375 114.3 7500

240

4.6 H40A

0.285 7.2

7.5

SUB7

61HE4200 310 94.5 9250

240

4.6 H40A

0.285 7.2

6.2

SUB8

61HC4100 550 167.6 9000

240

4.6 H60A

0.278 7.1

6.4

SUB9

61HC5651 630 192.0 12000

240

4.6 H60A

0.274 7.0

4.7

SUB10

61HC5409 717 218.5 17000

240

4.6 H80A

0.303 7.7

3.4

SUB1604

61HD3610 59

18.0 1600

240

4.6 H25A

0.200 5.1

36.0

SUB2004

61HD3390 74

22.6 2000

240

4.6 H25A

0.212 5.4

28.8

SUB2304

61HD3300 84

25.6 2300

240

4.6 H25A

0.240 6.1

25.0

SUB2804

61HD3200 103 31.4 2800

240

4.6 H25A

0.248 6.3

20.6

SUB3204

61HE3150 120 36.6 3200

240

4.6 H25A

0.228 5.8

18.0

208 Volts
SUA4

240 Volts

To modify cold lead length, contact your Pentair Thermal Management sales representative.
2
Resistance tolerance: +/– 10%
Tolerance on heating cable length: –0% to +3%
1

360

EN-PyrotenaxMISurfaceSnowMelting-DS-H57796

11/13

THERMAL MANAGEMENT SOLUTIONS

SUA/SUB Heating Cable Specifications
Catalog
number

Heating
Nominal Cable Cold lead
1
Heated
length
Config- cable
power voltage length
uration reference (ft)
(m) (watts) (volts) (ft) (m)

Nominal cable
Cold
diameter
lead Joint
code type
(in)
(mm)

Resis- Tail
tance2 size
(ohms) (AWG)

Fire Sprinkler System
Freeze Protection

240 Volts, cont.
B

61HE3105 140 42.7 3900

240

4.6 H25A

0.254 6.5

14.8

SUB4504

61HE4800 160 48.8 4500

240

4.6 H25A

0.262 6.7

12.8

SUB5204

61HE4600 185 56.4 5200

240

4.6 H25A

0.274 7.0

11.1

SUB6404

61HE4400 225 68.6 6400

240

4.6 H30A

0.265 6.7

9.0

SUB7304

61HE4300 263 80.2 7300

240

4.6 H40A

0.272 6.9

7.9

SUB9004

61HE4200 320 97.6 9000

240

4.6 H40A

0.285 7.2

6.4

SUB11904

61HC4100 426 129.9 11900

240

4.6 H60A

0.278 7.1

4.8

SUB14704

61HC5651 528 161.0 14700

240

4.6 H80A

0.274 7.0

3.9

SUB18604

61HC5409 664 202.4 18600

240

4.6 H80A

0.303 7.7

3.1

Roof and Gutter
De-Icing

SUB3904

277 Volts and 480 Volts, 3-phase Wye
SUA3

277

2.1 H22A

0.248 6.3

28.0

SUA8

61HE3105 177 53.9 4100

277

2.1 H22A

0.254 6.5

18.7

SUB2

61HE4600 240 73.1 5300

277

4.6 H25A

0.274 7.0

14.5

SUB3

61HE4400 280 85.3 6850

277

4.6 H30A

0.265 6.7

11.2

SUB4

61HE4300 320 97.5 8000

277

4.6 H30A

0.272 6.9

9.6

SUB6

61HE4200 375 114.3 10200

277

4.6 H40A

0.285 7.2

7.5

SUB8

61HC4100 550 167.6 12200

277

4.6 H60A

0.278 7.1

6.4

SUB9

61HC5651 630 192.0 16400

277

4.6 H60A

0.274 7.0

4.7

SUB15

61HE4800 225 68.6 4250

277

4.6 H25A

0.262 6.7

18.1

SUB16

61HE4400 310 94.5 6180

277

4.6 H25A

0.265 6.7

12.4

SUB17

61HE4200 440 134.1 8700

277

4.6 H40A

0.285 7.2

8.8

SUB18

61HC4100 560 170.7 12000

277

4.6 H60A

0.278 7.1

6.4

SUB1807

61HD3610 70

21.3 1800

277

4.6 H25A

0.200 5.1

42.6

SUB2307

61HD3390 85

25.9 2300

277

4.6 H25A

0.212 5.4

33.4

SUB2707

61HD3300 95

29.0 2700

277

4.6 H25A

0.240 6.1

28.4

SUB3207

61HD3200 119 36.3 3200

277

4.6 H25A

0.248 6.3

24.0

SUB3807

61HE3150 135 41.2 3800

277

4.6 H25A

0.228 5.8

20.2

SUB4507

61HE3105 162 49.4 4500

277

4.6 H25A

0.254 6.5

17.1

61HE4800 184

56.1 5200

277

4.6 H25A

0.262 6.7

14.8

61HE4600 213

64.9 6000

277

4.6 H25A

0.274 7.0

12.8

SUB7307

61HE4400 262

79.9 7300

277

4.6 H30A

0.265 6.7

10.5

SUB8507

61HE4300 300 91.5 8500

277

4.6 H40A

0.272 6.9

9.0

SUB10307

61HE4200 372 113.4 10300

277

4.6 H40A

0.285 7.2

7.4

SUB13707

61HC4100 491 149.7 13700

277

4.6 H60A

0.278 7.1

5.6

SUB17207

61HC5651 600 182.9 17200

277

4.6 H80A

0.274 7.0

4.5

Freezer Frost
Heave Prevention

SUB5207
SUB6007

Surface Snow
Melting – ElectroMelt

61HD3200 140 42.7 2740

Surface Snow
Melting – MI

Pipe Freeze Protection
and Flow Maintenance

mi heating cable for surface snow melting

To modify cold lead length, contact your Pentair Thermal Management sales representative.
Resistance tolerance: +/– 10%
Tolerance on heating cable length: –0% to +3%
1

Floor Heating

EN-PyrotenaxMISurfaceSnowMelting-DS-H57796

11/13

361

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

mi heating cable for surface snow melting
SUA/SUB Heating Cable Specifications
Catalog
number

Heating
Nominal Cable Cold lead
1
Heated
length
Config- cable
power voltage length
uration reference (ft)
(m) (watts) (volts) (ft) (m)

Nominal cable
Cold
diameter
lead Joint
code type
(in)
(mm)

Resis- Tail
tance2 size
(ohms) (AWG)

347 Volts and 600 Volts, 3-phase Wye
SUB2305

61HD3610 85

25.9 2300

347

4.6 H25A

0.200 5.1

52.4

SUB2905

61HD3390 107 32.6 2900

347

4.6 H25A

0.212 5.4

41.5

SUB3405

61HD3300 119 36.3 3400

347

4.6 H25A

0.240 6.1

35.4

SUB4105

61HD3200 148 45.1 4100

347

4.6 H25A

0.248 6.3

29.4

SUB4705

61HE3150 171 52.1 4700

347

4.6 H25A

0.228 5.8

25.6

SUB5605

61HE3105 205 62.5 5600

347

4.6 H25A

0.254 6.5

21.5

SUB6505

61HE4800 231 70.4 6500

347

4.6 H25A

0.262 6.7

18.5

SUB7505

61HE4600 267 81.4 7500

347

4.6 H25A

0.274 7.0

16.1

SUB9205

61HE4400 327 99.7 9200

347

4.6 H30A

0.265 6.7

13.1

SUB10605

61HE4300 380 115.9 10600

347

4.6 H40A

0.272 6.9

11.4

SUB13005

61HE4200 463 141.2 13000

347

4.6 H40A

0.285 7.2

9.3

SUB17205

61HC4100 614 187.2 17200

347

4.6 H60A

0.278 7.1

7.0

SUB19

61HD3200 245 74.7 4700

480

4.6 H25A

0.248 6.3

49.0

SUB20

61HE3105 340 103.6 6450

480

4.6 H25A

0.254 6.5

35.7

SUB21

61HE4600 440 134.1 8700

480

4.6 H25A

0.274 7.0

26.5

SUB22

61HE4400 525 160.0 11000

480

4.6 H25A

0.265 6.7

20.9

SUB3208

61HD3610 118 36.0 3200

480

4.6 H25A

0.200 5.1

72.0

SUB4008

61HD3390 147 44.8 4000

480

4.6 H25A

0.212 5.4

57.6

SUB4708

61HD3300 163 49.7 4700

480

4.6 H25A

0.240 6.1

49.0

SUB5708

61HD3200 202 61.6 5700

480

4.6 H25A

0.248 6.3

40.4

SUB6608

61HE3150 233 71.0 6600

480

4.6 H25A

0.228 5.8

34.9

SUB7908

61HE3105 278 84.8 7900

480

4.6 H25A

0.254 6.5

29.2

SUB9008

61HE4800 320 97.6 9000

480

4.6 H25A

0.262 6.7

25.6

SUB10408

61HE4600 368 112.2 10400

480

4.6 H25A

0.274 7.0

22.2

SUB12808

61HE4400 450 137.2 12800

480

4.6 H30A

0.265 6.7

18.0

480 Volts

SUB14808

61HE4300 520 158.5 14800

480

4.6 H40A

0.272 6.9

15.6

SUB18008

61HE4200 640 195.1 18000

480

4.6 H40A

0.285 7.2

12.8

SUB11

61HD3390 225

68.6 4100

600

4.6 H25A

0.212 5.4

87.8

SUB12

61HD3200 310

94.5 5800

600

4.6 H25A

0.248 6.3

62.1

600 Volts

SUB13

61HE3105 428

130.5 8000

600

4.6 H25A

0.254 6.5

45.0

SUB14

61HE4600 548 167.0 11000

600

4.6 H25A

0.274 7.0

32.7

SUB4006

61HD3610 147 44.8 4000

600

4.6 H25A

0.200 5.1

90.0

SUB5106

61HD3390 181 55.2 5100

600

4.6 H25A

0.212 5.4

70.6

SUB5806

61HD3300 207 63.1 5800

600

4.6 H25A

0.240 6.1

62.1

SUB7106

61HD3200 254 77.4 7100

600

4.6 H25A

0.248 6.3

50.7

SUB8206

61HE3150 293

600

4.6 H25A

0.228 5.8

43.9

89.3 8200

SUB9806

61HE3105 350

106.7 9800

600

4.6 H25A

0.254 6.5

36.7

SUB11206

61HE4800 402

122.6 11200

600

4.6 H25A

0.262 6.7

32.1

SUB13006

61HE4600 462 140.9 13000

600

4.6 H25A

0.274 7.0

27.7

SUB15906

61HE4400 566 172.6 15900

600

4.6 H30A

0.265 6.7

22.6

To modify cold lead length, contact your Pentair Thermal Management sales representative.
2
Resistance tolerance: +/– 10%
Tolerance on heating cable length: –0% to +3%
1

362

EN-PyrotenaxMISurfaceSnowMelting-DS-H57796

11/13

THERMAL MANAGEMENT SOLUTIONS

Approvals

Pipe Freeze Protection
and Flow Maintenance

mi heating cable for surface snow melting

Nonhazardous Locations

Ground-Fault Protection

Roof and Gutter
De-Icing

To minimize the danger of fire from sustained electrical arcing if the heating
cable is damaged or improperly installed, and to comply with the requirements
of Pentair Thermal Management, agency certifications, and national electrical
codes, ground-fault equipment protection must be used on each heating cable
branch circuit. Arcing may not be stopped by conventional circuit protection.
Many DigiTrace control and monitoring systems meet the ground-fault protection
requirement.

Fire Sprinkler System
Freeze Protection

421H

Surface Snow
Melting – MI
Surface Snow
Melting – ElectroMelt
Freezer Frost
Heave Prevention
Floor Heating

EN-PyrotenaxMISurfaceSnowMelting-DS-H57796

11/13

363

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

MI Heating Cable
Copper and HDPE jacketed copper sheathed MI cable
For heat loss replacement, floor heating and radiant space heating
Product Overview

MI Heating Cable Configuration
Type SUA
Design A
Heated length

Cold lead length
Hot/cold NPT threaded
connector
joint

Type SUB, HLR and FH
Design B
Cold lead length

Heated length

Cold lead length
Hot/cold NPT threaded
connector
joint

Heat-loss replacement – replaces heat in concrete floors
built over garages, loading docks, arcades, and other cold
spaces. The cable is typically attached to the bottom of
concrete floors.
Comfort floor heating – warms concrete, tile, stone and
marble floors in lobbies, foyers, bathrooms, kitchens and
gymnasiums. The cable is typically embedded in concrete or
a thick mortar bed.
Radiant space heating – provides primary space heating for
rooms with concrete floors. The cable is typically embedded
in concrete or a thick mortar bed.
Type HLR heating cables are supplied with a copper sheath
and are ideally suited for heat loss replacement applications.
Types SUA, SUB and FH heating cables have a copper sheath
that is covered with an extruded high-density polyethylene
(HDPE) jacket and are suitable for applications where the
cable is directly embedded in concrete or mortar floors.
The heating cables are factory assembled with an HDPE
jacketed copper sheath cold lead, pre-terminated and ready
to connect to a junction box. The copper sheath provides
an ideal ground path and allows for a rugged yet flexible
heating cable that is easy to install.
The radiant heat provided by the Pyrotenax heating cable
allows you to feel comfortable at lower air temperatures,
resulting in lower heating costs.
Pentair Thermal Management representatives can provide
design assistance and help you install the product that
meets your goals for an efficient, cost-effective floor heating
system.

Cable Construction
Type HLR heating cable
Sheath

Seamless copper

Insulation

Magnesium oxide

Conductor type

Alloy or copper

Number of conductors

Insulation voltage rating

600 V

Cable diameter (without jacket)

0.120 to 0.205 in (3.0 to 5.2 mm)

364

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THERMAL MANAGEMENT SOLUTIONS

Cable Construction
Types SUA, SUB and FH heating cable
HDPE

Sheath

Seamless copper

Insulation

Magnesium oxide

Conductor type

Alloy or copper

Number of conductors

Insulation voltage rating

600 V

Cable diameter (with jacket)

0.200 to 0.303 in (5.1 to 7.7 mm)

Fire Sprinkler System
Freeze Protection

Jacket

Pipe Freeze Protection
and Flow Maintenance

mi heating cable for floor heating

Cold lead (Type SUA/SUB/HLR/FH cables)
HDPE

Sheath

Seamless copper

Insulation

Magnesium oxide

Conductor type

Copper

Number of conductors

1 or 2

Insulation voltage rating

600 V

Cable diameter (with jacket)

0.310 to 0.420 in (7.9 to 10.7 mm)

Gland size (NPT)

1/2 in

Tail length

12 in (30 mm)

Roof and Gutter
De-Icing

Jacket

Surface Snow
Melting – MI

Minimum installation temperature
–4°F (–20°C)
Minimum bending radius
6 times cable diameter

Catalog
number

Heating
Config- cable
uration reference

Heated length
(ft)

(m)

Cold lead
Nominal Cable
length 1
power voltage
(watts) (volts) (ft) (m)

Nominal cable
diameter

Cold
lead Joint
code type

(in)

Resis- Tail
tance 2 size
(ohms) (AWG)

(mm)

120 Volts and 208 Volts, 3-phase Wye
B

61CD3610 70

21.3

330

120

4.6

H25A

0.120 3.0

43.6

61CD3610 44

13.4

540

120

4.6

H25A

0.120 3.0

26.7

HLR3

61CD3390 55

16.8

670

120

4.6

H25A

0.132 3.4

21.5

HLR4

61CD3300 63

19.2

760

120

4.6

H25A

0.160 4.1

18.9

HLR5

61CD3200 77

23.5

935

120

4.6

H25A

0.168 4.3

15.4

HLR6

61CE3150 89

27.1

1080

120

4.6

H25A

0.148 3.8

13.3

HLR7

61CE3105 106

32.3

1295

120

4.6

H25A

0.174 4.4

11.1

61CE4800 122

37.2

1475

120

4.6

H25A

0.182 4.6

9.8

61CE4600 140

42.7

1715

120

4.6

H25A

0.194 4.9

8.4

HLR10

61CE4400 172

52.4

2100

120

4.6

H25A

0.185 4.7

6.9

HLR11

61CE4300 198

60.4

2425

120

4.6

H25A

0.192 4.9

5.9

HLR12

61CE4200 244

74.4

2950

120

4.6

H30A

0.205 5.2

4.9

HLR13

61CC4100 322

98.2

3925

120

4.6

H40A

0.198 5.0

3.7

Floor Heating

HLR8
HLR9

Freezer Frost
Heave Prevention

HLR1
HLR2

Surface Snow
Melting – ElectroMelt

Type HLR - Heat Loss Replacement Cable Specifications

1 To modify cold lead length, contact your Pentair Thermal Management sales representative.
2 Resistance tolerance: +/– 10%
Tolerance on heating cable length: –0% to +3%

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365

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

mi heating cable for floor heating
Type HLR - Heat Loss Replacement Cable Specifications
Catalog
number

Heating
Config- cable
uration reference

Heated length
(ft)

(m)

Cold lead
Nominal Cable
length 1
power voltage
(watts) (volts) (ft) (m)

Nominal cable
diameter

Cold
lead Joint
code type

(in)

(mm)

Resis- Tail
tance 2 size
(ohms) (AWG)

208 Volts
HLR14
HLR15
HLR16

B
B
B

61CD3610 76 23.2
61CD3390 95 29.0
61CD3300 109 33.2

935
1170
1325

208
208
208

15
15
15

4.6
4.6
4.6

H25A
H25A
H25A

Y
Y
Y

0.120 3.0
0.132 3.4
0.160 4.1

46.3
37.0
32.7

14
14
14

HLR17

61CD3200 133

1625

208

4.6

H25A

0.168 4.3

26.6

40.5

HLR18

61CE3150 154

47.0

1875

208

4.6

H25A

0.148 3.8

23.1

HLR19

61CE3105 184

56.1

2240

208

4.6

H25A

0.174 4.4

19.3

HLR20

61CE4800 211 64.3

2565

208

4.6

H25A

0.182 4.6

16.9

HLR21

61CE4600 243

74.1

2970

208

4.6

H25A

0.194 4.9

14.6

HLR22

61CE4400 296

90.2

3655

208

4.6

H25A

0.185 4.7

11.8

HLR23

61CE4300 345

105.2

4180

208

4.6

H25A

0.192 4.9

10.4

HLR24

61CE4200 420 128.0

5150

208

4.6

H30A

0.205 5.2

8.4

HLR25

61CC4100 560

6780

208

4.6

H40A

0.198 5.0

6.4

170.7

240 Volts
HLR26

61CD3610 88

26.8

1075

240

4.6

H25A

0.120 3.0

53.6

HLR27

61CD3390 110

33.5

1345

240

4.6

H25A

0.132 3.4

42.8

HLR28

61CD3300 125 38.1

1535

240

4.6

H25A

0.160 4.1

37.5

HLR29

61CD3200 153

46.6

1880

240

4.6

H25A

0.168 4.3

30.6

HLR30

61CE3150 177

54.0

2170

240

4.6

H25A

0.148 3.8

26.5

HLR31

61CE3105 212

64.6

2590

240

4.6

H25A

0.174 4.4

22.2

HLR32

61CE4800 243 74.1

2965

240

4.6

H25A

0.182 4.6

19.4

HLR33

61CE4600 280

85.4

3430

240

4.6

H25A

0.194 4.9

16.8

HLR34

61CE4400 345

105.2

4175

240

4.6

H25A

0.185 4.7

13.8

HLR35

61CE4300 395

120.4

4860

240

4.6

H25A

0.192 4.9

11.9

HLR36

61CE4200 485 147.9

5940

240

4.6

H30A

0.205 5.2

9.7

HLR37

61CC4100 640

195.1

7900

240

4.6

H40A

0.198 5.0

7.3

61CD3610 102

31.1

1235

277

4.6

H25A

0.120 3.0

62.1

277 Volts and 480 Volts, 3-phase Wye
HLR38

HLR39

61CD3390 127

38.7

1550

277

4.6

H25A

0.132 3.4

49.5

HLR40

61CD3300 145 44.2

1765

277

4.6

H25A

0.160 4.1

43.5

HLR41

61CD3200 177 54.0

2170

277

4.6

H25A

0.168 4.3

35.4

HLR42

61CE3150 205

62.5

2495

277

4.6

H25A

0.148 3.8

30.8

HLR43

61CE3105 245 74.7

2985

277

4.6

H25A

0.174 4.4

25.7

HLR44

61CE4800 280 85.4

3425

277

4.6

H25A

0.182 4.6

22.4

HLR45

61CE4600 325

3935

277

4.6

H25A

0.194 4.9

19.5

99.1

HLR46

61CE4400 396 120.7

4845

277

4.6

H25A

0.185 4.7

15.8

HLR47

61CE4300 460 140.2

5560

277

4.6

H25A

0.192 4.9

13.8

HLR48

61CE4200 560

170.7

6850

277

4.6

H30A

0.205 5.2

11.2

HLR49

61CC4100 740 225.6

9100

277

4.6

H40A

0.198 5.0

8.4

1 To modify cold lead length, contact your Pentair Thermal Management sales representative.
2 Resistance tolerance: +/– 10%
Tolerance on heating cable length: –0% to +3%

366

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THERMAL MANAGEMENT SOLUTIONS

Type HLR - Heat Loss Replacement Cable Specifications
Heated length
(ft)

(m)

Cold lead
Nominal Cable
length 1
power voltage
(watts) (volts) (ft) (m)

Nominal cable
diameter

Cold
lead Joint
code type

(in)

(mm)

Resis- Tail
tance 2 size
(ohms) (AWG)

347 Volts and 600 Volts, 3-phase Wye
HLR50

61CD3610 127

38.7

1560

347

4.6

H25A

0.120 3.0

77.2

HLR51

61CD3390 160

48.8

1930

347

4.6

H25A

0.132 3.4

62.4

HLR52

61CD3300 182

55.5

2205

347

4.6

H25A

0.160 4.1

54.6

61CD3200 222

67.7

2715

347

4.6

H25A

0.168 4.3

44.3

61CE3150 258

78.7

3110

347

4.6

H25A

0.148 3.8

38.7

HLR55

61CE3105 306

93.3

3750

347

4.6

H25A

0.174 4.4

32.1

HLR56

61CE4800 350

106.7

4300

347

4.6

H25A

0.182 4.6

28.0

HLR57

61CE4600 405

123.5

4955

347

4.6

H25A

0.194 4.9

24.3

HLR58

61CE4400 495

150.9

6080

347

4.6

H25A

0.185 4.7

19.8

HLR59

61CE4300 575

175.3

6980

347

4.6

H25A

0.192 4.9

17.3

HLR60

61CE4200 700

213.4

8600

347

4.6

H30A

0.205 5.2

14.0

HLR61

61CD3610 175

53.4

2160

480

4.6

H25A

0.120 3.0

106.7

HLR62

61CD3390 220

67.1

2685

480

4.6

H25A

0.132 3.4

85.8

Roof and Gutter
De-Icing

HLR53
HLR54

Fire Sprinkler System
Freeze Protection

Catalog
number

Heating
Config- cable
uration reference

Pipe Freeze Protection
and Flow Maintenance

mi heating cable for floor heating

480 Volts

61CD3300 250

76.2

3070

480

4.6

H25A

0.160 4.1

75.0

61CD3200 306

93.3

3770

480

4.6

H25A

0.168 4.3

61.1

HLR65

61CE3150 355

108.2

4330

480

4.6

H25A

0.148 3.8

53.2

61CE3105 424

129.3

5175

480

4.6

H25A

0.174 4.4

44.5

61CE4800 485

147.9

5940

480

4.6

H25A

0.182 4.6

38.8

HLR68

61CE4600 560

170.7

6860

480

4.6

H25A

0.194 4.9

33.6

HLR69

61CE4400 690

210.4

8350

480

4.6

H25A

0.185 4.7

27.6

HLR70

61CD3610 220

67.1

2685

600

4.6

H25A

0.120 3.0

134.1

HLR71

61CD3390 275

83.8

3360

600

4.6

H25A

0.132 3.4

107.1

Surface Snow
Melting – ElectroMelt

HLR66
HLR67

Surface Snow
Melting – MI

HLR63
HLR64

600 Volts

61CD3300 313

95.4

3835

600

4.6

H25A

0.160 4.1

93.9

61CD3200 384

117.1

4690

600

4.6

H25A

0.168 4.3

76.8

HLR74

61CE3150 443

135.1

5420

600

4.6

H25A

0.148 3.8

66.4

HLR75

61CE3105 530

161.6

6470

600

4.6

H25A

0.174 4.4

55.6

HLR76

61CE4800 605

184.5

7440

600

4.6

H25A

0.182 4.6

48.4

HLR77

61CE4600 700 213.4

8570

600

4.6

H25A

0.194 4.9

42.0

Freezer Frost
Heave Prevention

HLR72
HLR73

1 To modify cold lead length, contact your Pentair Thermal Management sales representative.
2 Resistance tolerance: +/– 10%
Tolerance on heating cable length: –0% to +3%

Floor Heating

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367

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

mi heating cable for floor heating
Type SUA/SUB - Floor Heating and Radiant Space Heating Cable Specifications
Heating
Catalog Config- cable
number uration reference

Heated length
(ft)

(m)

Cold lead
Nominal Cable
length 1
power voltage
(watts) (volts) (ft) (m)

Cold
lead Joint
code type

Nominal cable
diameter
(in)

(mm)

Resis- Tail
tance 2 size
(ohms) (AWG)

120 Volts and 208 Volts, 3-phase Wye
SUA2

61HD3610 55 16.8 425

120

2.1 H22A

0.200 5.1

33.6

SUA3

61HD3200 140 42.7 500

120

2.1 H22A

0.248 6.3

28.0

SUA4

61HD3390 68 20.7 550

120

2.1 H22A

0.212 5.4

26.5

SUA7

61HD3200 95 29.0 750

120

2.1 H22A

0.248 6.3

19.0

SUA8

61HE3105 177 54.0 800

120

2.1 H22A

0.254 6.5

18.6

SUB1

61HE3105 132 40.2 1000

120

4.6 H25A

0.254 6.5

13.9

SUB2

61HE4600 240 73.2 1000

120

4.6 H25A

0.274 7.0

14.4

SUB3

61HE4400 280 85.4 1300

120

4.6 H30A

0.265 6.7

11.2

SUB4

61HE4300 320 97.6 1500

120

4.6 H30A

0.272 6.9

9.6

SUB5

61HE4300 260 79.3 1800

120

4.6 H40A

0.272 6.9

7.8

SUB6

61HE4200 375 114.3 1900

120

4.6 H40A

0.285 7.2

7.5

SUB7

61HE4200 310 94.5 2300

120

4.6 H40A

0.285 7.2

6.2

SUB8

61HC4100 550 167.7 2300

120

4.6 H60A

0.278 7.1

6.3

SUB9

61HC5651 630 192.1 3000

120

4.6 H60A

0.274 7.0

4.7

SUB10

61HC5409 717 218.6 4300

120

4.6 H80A

0.303 7.7

3.3

61HD3610 108 32.9 650

208

2.1 H22A

0.200 5.1

65.9

208 Volts
SUA1
SUA6

61HE3105 264 80.5 1650

208

2.1 H22A

0.254 6.5

27.7

SUB19

61HD3200 245 74.7 885

208

4.6 H25A

0.248 6.3

49.0

SUB20

61HE3105 340 103.7 1210

208

4.6 H25A

0.254 6.5

35.7

SUB21

61HE4600 440 134.1 1640

208

4.6 H25A

0.274 7.0

26.4

SUB22

61HE4400 525 160.1 2060

208

4.6 H25A

0.265 6.7

21.0

61HD3610 108 32.9 900

240

2.1 H22A

0.200 5.1

65.9

240 Volts
SUA1
SUA6

61HE3105 264 80.5 2100

240

2.1 H22A

0.254 6.5

27.7

SUB19

61HD3200 245 74.7 1175

240

4.6 H25A

0.248 6.3

49.0

SUB20

61HE3105 340 103.7 1615

240

4.6 H25A

0.254 6.5

35.7

SUB21

61HE4600 440 134.1 2180

240

4.6 H25A

0.274 7.0

26.4

SUB22

61HE4400 525 160.1 2745

240

4.6 H25A

0.265 6.7

21.0

14
14

277 Volts and 480 Volts, 3-phase Wye
SUB19

61HD3200 245 74.7 1565

277

4.6 H25A

0.248 6.3

49.0

SUB20

61HE3105 340 103.7 2150

277

4.6 H25A

0.254 6.5

35.7

SUB21

61HE4600 440 134.1 2900

277

4.6 H25A

0.274 7.0

26.4

SUB22

61HE4400 525 160.1 3650

277

4.6 H25A

0.265 6.7

21.0

347 Volts and 600 Volts, 3-phase Wye
SUB11

61HD3390 225 68.6 1400

347

4.6 H25A

0.212 5.4

87.8

SUB12

61HD3200 310 94.5 1950

347

4.6 H25A

0.248 6.3

62.0

SUB13

61HE3105 428 130.5 2700

347

4.6 H25A

0.254 6.5

44.9

SUB14

61HE4600 548 167.1 3700

347

4.6 H25A

0.274 7.0

32.9

1 To modify cold lead length, contact your Pentair Thermal Management sales representative.
2 Resistance tolerance: +/– 10%
Tolerance on heating cable length: –0% to +3%

368

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THERMAL MANAGEMENT SOLUTIONS

Type FH - Floor Heating and Radiant Space Heating Cable Specifications
Heated length
(ft)

(m)

Cold lead
Nominal Cable
length 1
power voltage
(watts) (volts) (ft) (m)

Cold
lead Joint
code type

Nominal cable
diameter
(in)

Resis- Tail
tance 2 size
(ohms) (AWG)

(mm)

120 Volts and 208 Volts, 3-phase Wye
FH1

61HD3610 54 16.5

440

120

4.6

H25A

0.200 5.1

32.9

FH2

61HD3390 68 20.7

545

120

4.6

H25A

0.212 5.4

26.5

FH3

61HD3300 77 23.5

625

120

4.6

H25A

0.240 6.1

23.1

61HD3200 95 29.0

760

120

4.6

H25A

0.248 6.3

19.0

61HE3150 109 33.2

880

120

4.6

H25A

0.228 5.8

16.4

FH6

61HE3105 130 39.6

1055

120

4.6

H25A

0.254 6.5

13.7

FH7

61HE4800 150 45.7

1200

120

4.6

H25A

0.262 6.7

12.0

FH8

61HE4600 173 52.7

1390

120

4.6

H25A

0.274 7.0

10.4

FH9

61HE4400 210 64.0

1715

120

4.6

H25A

0.265 6.7

8.4

FH10

61HE4300 245 74.7

1960

120

4.6

H25A

0.272 6.9

7.4

FH11

61HE4200 300 91.5

2400

120

4.6

H25A

0.285 7.2

6.0

FH12

61HD3610 94 28.7

755

208

4.6

H25A

0.200 5.1

57.3

FH13

61HD3390 118 36.0

940

208

4.6

H25A

0.212 5.4

46.0

Roof and Gutter
De-Icing

FH4
FH5

Fire Sprinkler System
Freeze Protection

Heating
Catalog Config- cable
number uration reference

Pipe Freeze Protection
and Flow Maintenance

mi heating cable for floor heating

208 Volts

61HD3300 134 40.9

1075

208

4.6

H25A

0.240 6.1

40.2

61HD3200 164 50.0

1320

208

4.6

H25A

0.248 6.3

32.8

FH16

61HE3150 190 57.9

1520

208

4.6

H25A

0.228 5.8

28.5

61HE3105 225 68.6

1830

208

4.6

H25A

0.254 6.5

23.6

61HE4800 260 79.3

2080

208

4.6

H25A

0.262 6.7

20.8

FH19

61HE4600 300 91.5

2400

208

4.6

H25A

0.274 7.0

18.0

FH20

61HE4400 365 111.3

2960

208

4.6

H25A

0.265 6.7

14.6

FH21

61HE4300 425 129.6

3390

208

4.6

H25A

0.272 6.9

12.8

FH22

61HE4200 520 158.5

4160

208

4.6

H25A

0.285 7.2

10.4

Surface Snow
Melting – ElectroMelt

FH17
FH18

Surface Snow
Melting – MI

FH14
FH15

240 Volts
B

61HD3610 108 32.9

875

240

4.6

H25A

0.200 5.1

65.9

61HD3390 135 41.2

1095

240

4.6

H25A

0.212 5.4

52.7

FH25

61HD3300 155 47.3

1240

240

4.6

H25A

0.240 6.1

46.5

FH26

61HD3200 190 57.9

1515

240

4.6

H25A

0.248 6.3

38.0

FH27

61HE3150 215 65.5

1785

240

4.6

H25A

0.228 5.8

32.3

FH28

61HE3105 260 79.3

2110

240

4.6

H25A

0.254 6.5

27.3

FH29

61HE4800 300 91.5

2400

240

4.6

H25A

0.262 6.7

24.0

61HE4600 345 105.2

2780

240

4.6

H25A

0.274 7.0

20.7

61HE4400 420 128.0

3430

240

4.6

H25A

0.265 6.7

16.8

FH32

61HE4300 490 149.4

3920

240

4.6

H25A

0.272 6.9

14.7

FH33

61HE4200 600 182.9

4800

240

4.6

H25A

0.285 7.2

12.0

Floor Heating

FH30
FH31

Freezer Frost
Heave Prevention

FH23
FH24

1 To modify cold lead length, contact your Pentair Thermal Management sales representative.
2 Resistance tolerance: +/– 10%
Tolerance on heating cable length: –0% to +3%

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369

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

mi heating cable for floor heating
Type FH - Floor Heating and Radiant Space Heating Cable Specifications
Heating
Catalog Config- cable
number uration reference

Heated length
(ft)

(m)

Cold lead
Nominal Cable
length 1
power voltage
(watts) (volts) (ft) (m)

Cold
lead Joint
code type

Nominal cable
diameter
(in)

(mm)

Resis- Tail
tance 2 size
(ohms) (AWG)

277 Volts and 480 Volts, 3-phase Wye
FH34

61HD3610 125 38.1

1005

277

4.6

H25A

0.200 5.1

76.3

FH35

61HD3390 155 47.3

1270

277

4.6

H25A

0.212 5.4

60.5

FH36

61HD3300 178 54.3

1440

277

4.6

H25A

0.240 6.1

53.4

FH37

61HD3200 218 66.5

1760

277

4.6

H25A

0.248 6.3

43.6

FH38

61HE3150 253 77.1

2020

277

4.6

H25A

0.228 5.8

38.0

FH39

61HE3105 300 91.5

2435

277

4.6

H25A

0.254 6.5

31.5

FH40

61HE4800 345 105.2

2780

277

4.6

H25A

0.262 6.7

27.6

FH41

61HE4600 400 122.0

3200

277

4.6

H25A

0.274 7.0

24.0

FH42

61HE4400 490 149.4

3915

277

4.6

H25A

0.265 6.7

19.6

FH43

61HE4300 564 172.0

4535

277

4.6

H25A

0.272 6.9

16.9

FH44

61HE4200 690 210.4

5560

277

4.6

H25A

0.285 7.2

13.8

347 Volts and 600 Volts, 3-phase Wye
FH45

61HD3610 155 47.3

1275

347

4.6

H25A

0.200 5.1

94.6

FH46

61HD3390 195 59.5

1585

347

4.6

H25A

0.212 5.4

76.1

FH47

61HD3300 220 67.1

1825

347

4.6

H25A

0.240 6.1

66.0

FH48

61HD3200 270 82.3

2230

347

4.6

H25A

0.248 6.3

54.0

FH49

61HE3150 315 96.0

2550

347

4.6

H25A

0.228 5.8

47.3

FH50

61HE3105 376 114.6

3050

347

4.6

H25A

0.254 6.5

39.5

FH51

61HE4800 430 131.1

3500

347

4.6

H25A

0.262 6.7

34.4

FH52

61HE4600 497 151.5

4040

347

4.6

H25A

0.274 7.0

29.8

FH53

61HE4400 610 186.0

4935

347

4.6

H25A

0.265 6.7

24.4

FH54

61HE4300 710 216.5

5650

347

4.6

H25A

0.272 6.9

21.3

480 Volts
FH55

61HD3610 215 65.5

1760

480

4.6

H25A

0.200 5.1

131.2

FH56

61HD3390 270 82.3

2190

480

4.6

H25A

0.212 5.4

105.3

FH57

61HD3300 310 94.5

2480

480

4.6

H25A

0.240 6.1

93.0

FH58

61HD3200 380 115.9

3030

480

4.6

H25A

0.248 6.3

76.0

FH59

61HE3150 435 132.6

3530

480

4.6

H25A

0.228 5.8

65.3

FH60

61HE3105 520 158.5

4220

480

4.6

H25A

0.254 6.5

54.6

FH61

61HE4800 600 182.9

4800

480

4.6

H25A

0.262 6.7

48.0

FH62

61HE4600 690 210.4

5565

480

4.6

H25A

0.274 7.0

41.4

FH63

61HD3610 270 82.3

2185

600

4.6

H25A

0.200 5.1

164.7

FH64

61HD3390 340 103.7

2715

600

4.6

H25A

0.212 5.4

132.6

600 Volts

FH65

61HD3300 385 117.4

3120

600

4.6

H25A

0.240 6.1

115.5

FH66

61HD3200 470 143.3

3830

600

4.6

H25A

0.248 6.3

94.0

FH67

61HE3150 545 166.2

4400

600

4.6

H25A

0.228 5.8

81.8

FH68

61HE3105 650 198.2

5275

600

4.6

H25A

0.254 6.5

68.3

1 To modify cold lead length, contact your Pentair Thermal Management sales representative.
2 Resistance tolerance: +/– 10%
Tolerance on heating cable length: –0% to +3%

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THERMAL MANAGEMENT SOLUTIONS

Approvals

Ground-Fault Protection

Roof and Gutter
De-Icing

Fire Sprinkler System
Freeze Protection

Note: For heat loss replacement applications where the cable
is attached to the bottom of the concrete floor, contact Pentair
Thermal Management for additional information.

Pipe Freeze Protection
and Flow Maintenance

mi heating cable for floor heating

Surface Snow
Melting – MI
Surface Snow
Melting – ElectroMelt
Freezer Frost
Heave Prevention
Floor Heating

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

quicknet
floor heating system

QuickStat-TC
thermostat
Floor
temperature
sensor

QuickNet floor
heating mat

Cold lead

Sample
Bathroom

10 ft

Product Overview
Raychem QuickNet is an electric floor heating system for
installation under the following surfaces:
• Ceramic or porcelain tile
• Granite
• Marble (except cultured marble)
• Natural stone
• Laminate* wood flooring (floating only)
• Engineered* wood flooring (floating or gluedown)
* For laminate and engineered wood flooring, please
refer to the wood manufacturer’s recommendations to
determine which types are approved for use with floor
heating systems and any specific temperature limit set
points.
The QuickNet system provides comfort heating in
bathrooms, showers, kitchens, entryways and other living
areas. QuickNet’s compatibility with all standard subflooring materials, and its low 3/16 inch (3 mm) profile, make
it ideal for renovation projects.

6 in

9 ft

5 ft

Linens

3 ft 6 in

15 sq ft

The QuickNet floor heating system includes a blue heating
cable attached to an adhesive-backed red fiberglass mesh
that allows for simple roll-out installation without worrying
about heating cable spacing.
The floor heating mats are pre-terminated for use with
120 V, 208 V, and 240 V and are available in various lengths
of 20-inch widths.

T
10 ft

For example:
If your bathroom is 9 ft x 10 ft

90 sq ft

minus the cabinet area
minus the toilet space
minus the linen closet
minus the shower area

10 sq ft
6 sq ft
8 sq ft
15 sq ft*

Total area to be heated

51 sq ft

Solution:
Choose the 50 sq ft QUICKNET (QuickNet-050-1).
* If the shower area is to be heated, select a 15 sq ft
QUICKNET (QuickNet-015X-1) also.

The QuickNet mats emit no measurable electromagnetic
fields due to the shielded dual conductor design. This dual
conductor cable requires only one cold lead connection
making it easy to layout and install the mat. The cold lead is
a black non-heating cord that runs in the wall and connects
the heating mat system to the thermostat.
The QuickStat-TC thermostat includes built-in GFCI
protection. It’s adaptive function automatically switches
the system on to ensure a comfortable floor temperature
when you want it. Depending upon the specifics of your
installation, the QuickNet floor heating system can maintain
floor temperatures up to 85°F or more.
Various sizes of floor heating mats are designed to fit the
heated area of any floor. The heated area is the area of the
floor where there are no permanent fixtures or furniture
such as tubs, toilets, vanities or cabinets.

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Kit Contents

Fire Sprinkler System
Freeze Protection

1 QuickNet floor heating mat (with 10-foot cold lead)
1 QuickStat-TC thermostat
1 Floor temperature sensor (15-foot length)
Installation Instructions

Pipe Freeze Protection
and Flow Maintenance

quicknet

Approvals
-w

Roof and Gutter
De-Icing

Mat Specifications
120 V, 208 V, and 240 V

Power output

12 W/ft2 (130 W/m2) ±10% at 120 V or 240 V
9 W/ft2 (97 W/m2) ± 10% at 208 V

Minimum bending radius

1.25 in (30 mm)

Minimum cable spacing

3 in (80 mm)

Maximum ambient temperature

85°F (30°C)

Minimum installation temperature

40°F (5°C)

Heating cable

2-wire, grounded, fluoropolymer insulating jacket

Cold lead

2-wire 16 AWG plus ground braid; 10 ft (3 m) length

Surface Snow
Melting – MI

Operating voltage

Thermostat Specifications
On/Off control, digital display, 7-day programmable, Class A, 5 mA GFCI

Supply voltage

120 V, 208 V, 240 V, 60 Hz

Maximum switching current

15 A

Ambient setpoint range (A/AF mode)

40 to 86°F (5 to 30°C)

Floor setpoint range (F mode)

40 to 104°F (5 to 40°C)

Floor limit setpoint range (AF mode)

40 to 104°F (5 to 40°C)

Floor temperature sensor

2-wire, 15-foot lead wire

Surface Snow
Melting – ElectroMelt

Functions

Freezer Frost
Heave Prevention
Floor Heating

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373

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

QuickStat-TC
thermostat
Floor
temperature
sensor

QuickNet floor
heating mat

quicknet
Ordering Details

Select the QuickNet floor heating mat that is no larger than the heated area. The
heated area is the area of the floor that does not include permanent fixtures such
as cabinets, toilets, sinks or tubs. The selected mat can be configured on the
jobsite to fit the shape of the area to be heated.
Cold lead

Sample
Bathroom

10 ft

6 in

9 ft

5 ft

Linens

3 ft 6 in

15 sq ft

T
10 ft

For example:
If your bathroom is 9 ft x 10 ft

90 sq ft

minus the cabinet area
minus the toilet space
minus the linen closet
minus the shower area

10 sq ft
6 sq ft
8 sq ft
15 sq ft*

Total area to be heated

51 sq ft

Solution:
Choose the 50 sq ft QUICKNET (QuickNet-050-1).
* If the shower area is to be heated, select a 15 sq ft
QUICKNET (QuickNet-015X-1) also.

Note: Extension Kits are available to accommodate larger heated areas. Unlike
Standard Kits, extension kits do not include the QuickStat-TC thermostat or floor
sensor. The maximum installation area is 140 ft2 at 120 V and 280 ft2 at 240 V.
For heated areas greater than 280 ft2, contact Pentair Thermal Management for
design assistance.

374

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THERMAL MANAGEMENT SOLUTIONS

Catalog number

Heated area
ft2
m2

Mat dimensions

Current (A)

120
180
240
300
360
420
480
540
600
720
840
960
1080
1200

1
1.5
2
2.5
3
3.5
4
4.5
5
6
7
8
9
10

120
80
60
48
40
35
30
27
24
20
17
15
13
12

120
180
240
300
360
420
480
540
600
720
840
960
1080
1200

1
1.5
2
2.5
3
3.5
4
4.5
5
6
7
8
9
10

120
80
60
48
40
35
30
27
24
20
17
15
13
12

Resistance
(Ohms)

450
540
720
900

600
720
960
1200

2.5
3
4
5

96
80
60
48

Freezer Frost
Heave Prevention

96
80
60
48

Surface Snow
Melting – ElectroMelt

2.5
3
4
5

Surface Snow
Melting – MI

600
720
960
1200

Roof and Gutter
De-Icing

450
540
720
900

Fire Sprinkler System
Freeze Protection

Power Output (W)
120 V 208 V 240 V

Pipe Freeze Protection
and Flow Maintenance

quicknet

Accessories
The QuickNet-RK repair kit is for repairing damaged QuickNet heating
cable. The kit incorporates SolderSleeve terminations, jumper wires,
and heat-shrinkable tubing.

QuickNet-Check

QUICKNET-CHECK

The QuickNet-Check monitor is used to verify the continuity of the
QuickNet heating cable and the integrity of its outer jacket during
the installation process. The monitor connects to the cold leads of
the cable and, if the heating cable is damaged, the alarm on the
monitor will sound. The monitor can also be re-used for subsequent
installations and to help troubleshoot any problems that may arise.

THERMAL MANAGEMENT SOLUTIONS

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375

Technical Data
Sheets

Description

QuickNet-RK

Floor Heating

Catalog number
Repair Kit

acs-30
multipoint commercial heat-tracing system
Product Overview

ACS-30
System

ACS-UIT

POINT
SINGLEOLLER
LE
CONTR
G
AMMAB
RACIN
PROGR
HEAT-T

C910

S
SERIE
S
STATU

ALARM
T
OUTPU

G
OR

CONFI

MONIT
ENTER

ALARM
BACK
TEST
SHIFT

C910-485

TRO
CONE
ER DUL -5
POWMO CM
S-P
ACC

The DigiTrace ACS-30 Advanced Commercial Control System
is a multipoint electronic control and monitoring system
for heat-tracing applications. These applications include
commercial freeze protection, surface snow melting, roof
and gutter de-icing, and flow and temperature maintenance.
The ACS-30 system can control up to 260 circuits with
multiple networked ACS-PCM2-5 panels, or DigiTrace C910485 controllers for single circuit system extension. The ACSPCM2-5 panel can directly control up to 5 individual heattracing circuits using electromechanical relays rated at 30
A up to 277 V. Four Resistance Temperature Detector (RTD)
sensor inputs can be assigned for each heating cable circuit
providing a variety of temperature control, monitoring, and
alarm options. The ACS-30 can be fitted with 16 DigiTrace
RMM2s, providing an additional 128 temperature inputs to a
maximum of 388 inputs.

MO
COM RM
ALA

ACS-PCM-5

TRO
CONE
ER DUL -5
POWMO CM
S-P
ACC

N
MO
COM RM
ALA

ACS-PCM-5

Heat-tracing system

Control
The ACS-30 is pre-programmed with parameters for
commercial hot water temperature maintenance, pipe freeze
protection, flow maintenance, freezer frost heave prevention,
surface snow melting, roof and gutter de-icing prevention
and floor heating applications. The pre-programmed
application settings significantly simplify setting up multiple
heating cable circuits. Based on the application the ACS-30
can be configured for On/Off, Ambient Sensing, Proportional
Ambient Sensing (PASC), and timed duty cycle control
modes for HWAT applications.
The ACS-30 measures temperatures with 3-wire, 100-ohm
platinum RTDs connected directly to the unit, or through
optional Remote Monitoring Modules (RMM2). Each RMM2
accepts up to eight RTDs. Multiple RMM2s are networked
over a single cable to the ACS-30, significantly reducing the
cost of RTD wiring.
The built-in calendar function for hot water temperature
maintenance, floor heating and greasy waste applications
provides flexible timed set points providing energy savings.
Monitoring
To assist with energy management the ACS-30 monitors
the power consumption of each heating cable circuit for
up to five years of operation. The data may be graphically
displayed daily, weekly, monthly or yearly. The ACS-30
measures 12 control parameters including ground fault,
temperature, and current to ensure system integrity.
Configurable alarm settings provide options for local or

376

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THERMAL MANAGEMENT SOLUTIONS

Ground-fault protection
National electrical codes require ground-fault equipment
protection on all heat-tracing circuits. The ACS-30
controller has integrated ground-fault equipment protection
and therefore does not require additional ground-fault
protection, simplifying installation and reducing costs.

Installation
The ACS-30 system is configured with the User Interface
Terminal (ACS-UIT2) that has an LCD color display with
touch-screen technology. The ACS-UIT2 provides an easy
user interface for programming without keyboards or cryptic
labels. The ACS-30 Program Integrator application tool is
available to program, edit and download circuit parameters
through the local USB port or from a remote location.
The ACS-UIT2 comes in a Type 4X enclosure suitable for
nonhazardous, indoor or outdoor locations and comes
complete with wiring terminals and an alarm signal light.

ACS-30 System
Multipoint temperature control with
ground-fault/current/temperature
monitoring when used with the
ACS-UIT2

The ACS-30 provides the following alarming features per control point.
• High/low temperature
• Ground fault
• High/low current fault
• RTD failure

Freezer Frost
Heave Prevention

The ACS-30 provides ground-fault monitoring and protection for every heat-tracing
circuit and fulfills the requirements of national electrical codes.
ACS-30: Heating Cable Application Programming Summary
Control Mode Functions
Control Mode

Control Settings

HWAT

Preset power duty cycle
(HWAT Design Wizard)

Floor Heating

RaySol
MI heating cable
QuickNet

Floor sensing

• Constant temp
• Variable schedule
–– Maintain
–– Economy
–– Off
–– Heat Cycle (R2 only)
• Constant temp
• Variable schedule
–– Maintain
–– Economy
–– Off
• Circuit override through RTD or
external device

THERMAL MANAGEMENT SOLUTIONS

EN-DigiTraceACS30-DS-H58261

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377

Technical Data
Sheets

Heating cable

Hot Water Temperature
Maintenance

Floor Heating

Application

Surface Snow
Melting – ElectroMelt

The ACS-30 is a multipoint electronic control, monitoring, and power relay system
for heat-tracing cables used in commercial heat-tracing applications. The system
consists of a DigiTrace ACS-UIT2 and up to 52 ACS-PCM2-5 power control panels.
C910-485 controllers may also be connected to the system for multiple, single circuit
extensions. DigiTrace RMM2 heat-tracing remote monitoring modules may also be
used with the ACS-30 system to expand the number of temperature measurement
points.

Surface Snow
Melting – MI

Complete system
The ACS-30 is supplied as a complete modular system,
ready for field connections to convenient power distribution
panels and temperature sensor input, reducing the cost of
heating cable installation.

Roof and Gutter
De-Icing

Communications
ACS-30 units support the Modbus® protocol and are
available with RS-232, RS‑485 or 10/100Base-T Ethernet
communication interface. DigiTrace ProtoNode multiprotocol gateways are available to integrate the ACS-30 into
BACnet®, Metasys® N2 and LonWorks® BMS systems.

Fire Sprinkler System
Freeze Protection

remote alarms. These alarms can be programmed to send
notification of the alarm event by e-mail to user-selected
distribution. The system can be set to periodically check
for heating cable faults, alerting maintenance personnel
of a pending heat tracing problem. This helps avoid costly
downtime. Dry contact relays are provided for alarm
annunciation back to a Building Management System (BMS).

Pipe Freeze Protection
and Flow Maintenance

acs-30

acs-30
ACS-30: Heating Cable Application Programming Summary
Control Mode Functions
Application

Heating cable

Control Mode

Control Settings

Greasy Waste Disposal and
Temperature Maintenance

XL-Trace

Line sensing

Pipe Freeze Protection

XL-Trace

Ambient, PASC or
line sensing

Fuel Oil Flow Maintenance

XL-Trace

Ambient, PASC or
line sensing

Ambient or surface temp

• Constant temp
• Variable schedule
–– Maintain
–– Economy
–– Off
• Constant temp
• Circuit override through external
device
• Constant temp
• Circuit override through RTD or
external device
• Constant temp
• Variable schedule
–– Maintain
–– Off
Constant temp

External controller

External snow controller

Ambient or surface temp

Constant temp

External controller

External snow controller

Freezer Frost Heave Prevention • RaySol
Floor sensing
• MI heating cable

Surface Snow Melting

Roof and Gutter De-icing

• ElectroMelt
• MI Heating
Cable
• IceStop
• MI Heating
Cable

Temperature Monitor Only

Variable schedule

Five temperature monitor only channels
Low and high temperature alarms

Setpoint calendar with:
• 7 days/week calendar
• 48 - 1/2 hr time blocks/day
• Daily schedule copy function

ACS-UIT2 (User Interface Terminal)
The DigiTrace ACS-30 User Interface Terminal is a panel-mounted display for
use with the ACS panel. The ACS-UIT2 has an 8.4 inch (21.7 cm) VGA color
display with touch-screen technology, and provides an easy user interface for
programming without keyboards or cryptic labels. It has RS-485, RS-232, or
10/100Base-T Ethernet communications ports that allow communication with
external Distributed Control Systems or Building Management Systems. BACnet
and LonWorks to Modbus protocol gateways with the Modbus registries preprogrammed are available. A USB interface is included for easy configuration and
firmware upgrades.
The ACS-UIT2 is designed for use on indoor or nonhazardous location
installations and is rated for NEMA 4 environments.
General
Approvals
LR67275

Area of use

Nonhazardous, indoors and outdoors (IP65, Type 4)

Supply voltage

100 – 240 Vac +/–10%, 50/60 Hz

Operating temperature

–25°C to 50°C (–13°F to 122°F)

Supply terminal

26–12 AWG

Storage temperature

–25°C to 80°C (–13°F to 176°F)

Dimensions

386 mm W x 336 mm H x 180 mm D, (15.21 in. W x 13.21 in. H x 7.09 in. D)

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THERMAL MANAGEMENT SOLUTIONS

ACS-UIT2 (User Interface Terminal)
Alarm outputs
Relay outputs
Network connection
Local port/remote

RS-232/RS-485 ports (RS-485, 2-wire isolated) may be used to communicate with
host BMS computers using the DigiTrace ProtoNode-RER or ProtoNode-LER.
(ACS-30 Program Integrator).
A non-isolated, 9 pin D sub male

Remote RS-485 #2

10 pin terminal block, 24–12 AWG, (0.2 mm to 2.5 mm2) wire size

Data rate

9600 to 57600 baud

Maximum cable length

For RS-485 not to exceed 1200 m (4000 ft). Cable to be shielded twisted pair.

Field port

Roof and Gutter
De-Icing

Local RS-232

RS-485, 2-wire isolated. Used to communicate with external devices, such as
ACS-PCM2-5, DigiTrace C910-485, and RMM2. Maximum cable length not to
exceed 1200 m (4000 ft). Cable to be shielded twisted pair.

Field RS-485 #1

10 pin terminal block, 24–12 AWG, (0.2 mm to 2.5 mm2) wire size

Data rate

To 9600 baud
10/100 Base-T Ethernet port with Link and Activity Status LEDs

USB port

USB 2.0 Host port Type A receptacle (X2)

LCD display
Display

LCD is a 8.4 inch (21.7 cm) VGA, color TFT transflective device with integral CCFL
backlight

Touch screen

4-wire resistive touch screen interface for user entry

Surface Snow
Melting – MI

LAN

Fire Sprinkler System
Freeze Protection

Three form C relays rated at 12 A @ 250 Vac. One relay used for common alarm
light. Relays may be assigned for alarm outputs.

Pipe Freeze Protection
and Flow Maintenance

acs-30

ACS-PCM2-5 Power Control Panel

ER
NG M
DA IMU S
X T
MA VOL
7
27

ACS-30 General (RPN P000001232) panels are available to satisfy special
applications which require higher voltage, higher switching capacity, panel
heaters, etc. Contact Pentair Thermal Management at 1 (800) 545-6258 for
design assistance.

Surface Snow
Melting – ElectroMelt

NEL

T TR
HEA

The ACS-PCM2-5 enclosure is rated NEMA 4/12 and is approved for nonhazardous
indoor or outdoor locations. The ACS-PCM2-5 provides ground fault and line
current sensing, alarming, switching (electromechanical relays) and RTD inputs
for five heat tracing circuits when used with the ACS-UIT2.

Freezer Frost
Heave Prevention

GM
NA
L MA
MA IN DR 6
ER
TH RW 7703
HA TX
AIR
NT 7433 N,

2-5
CM
HZ
S-P
X
ACCE 4, 12 XXX E, 60 AL,
WIR RIC
NO: TYP XXXXX, 2 MET
DEL :
ASE S SYM
MO URE XXX
LOS NO: , 1PH RM
ENC IAL VAC T 5kA
SERX 277 REN
E: MA T CUR
TAG CUI M
VOL RT CIR IMU
MAX
SHOVAC
277

General
Approvals

24" W x 24" H x 6.75" D (610 mm W x 610 mm H x 171 mm D)

Enclosure rating

NEMA 4/12 (indoor/outdoor locations)

Control supply voltage

90 - 280 V dropped to 12 V with switching power supply

Weight

70 lbs (31.75 kg)

Humidity

0–90% non-condensing

Fuse

Bussman MDL

THERMAL MANAGEMENT SOLUTIONS

EN-DigiTraceACS30-DS-H58261

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379

Technical Data
Sheets

–13°F to 122°F (–25°C to 50°C)

Dimensions

Floor Heating

Ambient operating temperature

acs-30
ACS-PCM2-5 Power Control Panel
Heating cable circuit contactors
Rating

3-pole – 30 A/pole 277 Vac

Type

Sprecher-Schuh CA7-16-10-12D

Quantity

Temperature sensors
Type

100-ohm platinum RTD, 3-wire, α = 0.00385 ohm/ohm/°C
Can be extended with a 3-conductor shielded cable of 20 ohm maximum per
conductor

Quantity

Up to five wired directly to the ACS-CRM

Communication to ACS-UIT2, ACS-PCM2-5 panels, C910-485 and RMM2
Type

2-wire RS-485

Cable

One shielded twisted pair

Length

4000 ft (1200 M) maximum

Quantity

Up to 52 ACS-PCM2-5 panels may be connected to one ACS-UIT2

Line current sensors
Max current

60 A

Accuracy

± 2% of reading

Ground-fault sensors
Range

10–200 mA

Accuracy

± 2% of reading

Connection terminals
Power supply/line/load

#22 – 8 AWG

RS-485

#24 – 12 AWG

RTD

#24 – 12 AWG

C910-485 Electronic Controller (optional)

INT
ER

PO
E
GL LL
SIN RO
LE NT
AB CO
MM ING
RA
OG AC
PR AT-TR
HE

RIES

TU
STA

OU
IG

NIT

TER

ALAR

TES
IFT

The DigiTrace C910-485 controller Part No. 10170-026 is a compact, full-featured,
microprocessor-based, single-point commercial heating cable control system
with integrated equipment ground-fault protection. The C910-485 provides
control and monitoring of electric heating cable circuits for commercial heating
applications. The C910-485 can be set to monitor and alarm for high and low
temperature, low current, and ground-fault level. The C910-485 includes an
RS-485 communication module to remotely configure, control and monitor the
heating cable circuits through a building management system (BMS).

Remote Monitoring Module (Optional)
A Remote Monitoring Module (RMM2, Part No: 051778-000) is used to collect
additional temperatures for control and monitoring of the heat-tracing circuit by
the ACS-PCM2-5 control panel, through the ACS-UIT2 user interface terminal.
The RMM2 accepts up to eight RTDs that measure pipe, vessel, or ambient
temperatures. Multiple RMM2s communicate with a single ACS-UIT2 to provide
centralized monitoring of temperatures. A single twisted-pair RS-485 cable
connects up to 16 RMM2s for a total monitoring capability of 128 temperatures.
The RMM2s are placed near desired measurement locations. The RMM2 is
available for DIN rail mount or pre-installed inside a polycarbonate NEMA-4X
enclosure (Part No: 523420-000).

380

EN-DigiTraceACS30-DS-H58261

11/13

THERMAL MANAGEMENT SOLUTIONS

Protocol Gateway (Optional)

CES ET
TO HERN
PSREROIAL ET ODE
ON
T
PRO

A0
A1
A2
A3
A4
A5
A6
A7

ies
log
no
ch com
r Te or.
rve Cess
ldSe to
Fie .Pro
By ww
w

B0
B1
B2
B3
S0
S1
S2
S3

Fire Sprinkler System
Freeze Protection

The ProtoNode is an external, high performance multi-protocol gateway for
customers needing protocol translation between Building Management Systems
(BMS) and the DigiTrace ACS-30 controller.
The ProtoNode-LER (Part No. P000001228) is for LonWorks® systems; and the
ProtoNode-RER (Part No P000001227) is for BACnet® or Metasys® N2 systems.

WR
+P R
W
- P ND
EG

FR
ND

5G
48 RS 485+
RS 485
RS

Roof and Gutter
De-Icing

Typical Configurations for the DigiTrace ACS-30 System
Individual controls

Pipe

RS-485

• Monitors ground-fault current and
alarms/trip control contactor upon
fault

RTD

Heating
cable

• Monitors heater current and alarms
upon low or high current conditions

To heating cable power
distribution panel

ACS-UIT2

Surface Snow
Melting – MI

• Monitors pipe temperature (via RTD
inputs wired back to the DigiTrace
ACS-PCM2-5 or RMM2)

Pipe Freeze Protection
and Flow Maintenance

acs-30

ACS-PCM2-5

Individual controls with RMM2
• Monitors ground-fault current and
alarms/trip control contactor upon
fault

RS-485

RTD

• Monitors heater current and alarms
upon low or high current conditions
• Monitors pipe temperature (via RTD
inputs wired back to the DigiTrace
ACS-PCM2-5)

Surface Snow
Melting – ElectroMelt

Pipe
RMM2
Remote
monitoring
module
Heating
cable

ACS-UIT2

To heating cable power
distribution panel

Freezer Frost
Heave Prevention

• Using optional RMM2 (remote
monitoring modules) mounted in the
field, up to 128 RTD inputs can be
added to the ACS-30 system

ACS-PCM2-5

• The RMMs allow the RTD cables to
be terminated locally and only a single RS-485 twisted wire pair brought
back to the panel. This results in a
significant reduction in field wiring.

Floor Heating

EN-DigiTraceACS30-DS-H58261

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381

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

acs-30
Typical Configurations for the DigiTrace ACS-30 System
Individual ambient control
• Monitors ground-fault current and
alarms/trip control contactor upon
fault

RS-485
Ambient
RTD

• Monitors heater current and alarms
upon low or high current conditions
• Monitors pipe temperature (via RTD
inputs wired back to the DigiTrace
ACS-PCM2-5 or RMM2)

Pipe
RTD

Heating
cable

ACS-UIT2

To heating cable power
distribution panel

ACS-PCM2-5

Individual external control for surface
snow melting and roof & gutter
application

RS-485

Snow
controller

Snow sensor
Concrete
slab

• Monitors ground-fault current and
alarms/trip control contactor upon
fault
• Monitors heater current and alarms
upon low or high current conditions

ACS-UIT2

Heating
cable

• Monitors pipe temperature (via RTD
inputs wired back to the DigiTrace
ACS-PCM2-5 or RMM2)

To heating cable power
distribution panel

ACS-PCM2-5

• Connects to snow controllers (via
RTD input) to power circuits when
snow/ice melting is required
Multipanel configuration
• Multiple panels can be ganged
together for control using a single
DigiTrace User Interface Terminal
• Communications is accomplished
using RS-485 protocol
• Up to 260 heat trace circuits can be
supported using this architecture

382

RS-485

RS-485
RMM2 Remote
monitoring module

POINT
LLER

SINGLE
CONTRO
MMABLE
ACING
PROGRA
HEAT-TR

C910

SERIES
STATUS ALARM
OUTPUT
R

CONFIG

MONITO
ENTER

ALARM
BACK
TEST
SHIFT

ACS-UIT2
C910-485
ACS-PCM2-5

EN-DigiTraceACS30-DS-H58261

11/13

ACS-PCM2-5

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection
and Flow Maintenance
Fire Sprinkler System
Freeze Protection

c910-485
Single-point heat-tracing control system

INT
PO ER
GLE LL
SIN TRO
LE N
AB CO
MM G
RA CIN
OG RA
PR AT-T
HE

RIE

U
STAT

OU
G

NFI

TER

ALA

TEST

IFT

Both an isolated solid-state triac relay and a dry contact
relay are provided for alarm annunciation back to a
building management system (BMS).

EN-DigiTraceC910series-DS-H58374

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383

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating

Ground-fault protection
National electrical codes require ground-fault equipment
protection on all heat-tracing circuits. The C910-485
controllers incorporate ground-fault sensing, alarm,
and trip functionality internally. Heating cable circuits
equipped with C910-485 controllers do not require additional
ground-fault protection equipment, simplifying installation
and reducing costs. The C910-485 automatically tests the
integrity of the integrated ground-fault circuitry, ensuring
protection in the event of a ground fault.

Freezer Frost
Heave Prevention

Monitoring
A variety of parameters are measured, including ground
fault, temperature, and current to ensure system integrity. The
system can be set to periodically check the heating cable
for faults, alerting maintenance personnel of a heat-tracing
problem.

Surface Snow
Melting – ElectroMelt

Control
The C910-485 measures temperature with one or two 3-wire
100-ohm platinum RTD(s) connected directly to the unit. The
controller may be used in line-sensing, ambient-sensing and
proportional ambient-sensing control (PASC) modes. The
C910-485 may also be connected into the ACS-30 system
for single circuit extensions. When in the ACS-30 system
it is controlled by the ACS-UIT2 and has all the application
functionality of the ACS-30 system.

Surface Snow
Melting – MI

IT
ON

The DigiTrace C910-485 is a compact, full-featured,
microprocessor-based, single-point commercial heating
cable control system with integrated equipment ground-fault
protection. The C910-485 provides control and monitoring
of electric heating cable circuits for commercial heating
applications. The C910-485 can be set to monitor and alarm
for high and low temperature, low current, and ground-fault
level. The C910-485 includes an RS-485 communication
module to remotely configure, control and monitor the
heating cable circuits through a building management
system (BMS).

Roof and Gutter
De-Icing

Product overview

c910-485
Installation
The C910-485 unit comes ready to install right from the
box, eliminating the need for custom panel design or field
assembly. The NEMA 4X-rated enclosure is approved for
use in indoor and outdoor locations. Wiring is as simple as
connecting the incoming and outgoing power wiring (up to
277 Vac) and an RTD.

Communications
The C910-485 supports Modbus® protocol and includes an
RS-485 communications interface. DigiTrace ProtoNode
multi-protocol gateways are available to integrate the C910485 or ACS-30 into BACnet®, Metasys® N2 and LonWorks®
BMS systems.

The C910-485 operator interface includes LED displays and
function keys that make it easy to use and program. No
additional handheld programming devices are needed. Alarm
conditions and programming settings are easy to interpret
on the full-text front panel. Settings are stored in nonvolatile
memory in the event of power failure.
General
Area of use
Approvals

Supply voltage

Nonhazardous locations
Nonhazardous locations

100 Vac to 277 Vac, +5 / –10%, 50/60 Hz
Common supply for controller and heat-tracing circuit

Enclosure
Protection

NEMA 4X

Materials

FRP/Polycarbonate

Ambient operating temperature range

–40°F to 140°F (–40°C to 60°C)

Ambient storage temperature range

–40°F to 185°F (–40°C to 85°C)

Relative humidity

0% to 90%, noncondensing

Control
Relay type

Double-pole, mechanical

Voltage, maximum

277 Vac nominal, 50/60 Hz

Current, maximum

30 A @ 104°F (40°C) derated to 20 A @ 140°F (60°C)

Control algorithms

EMR: On/off, proportional ambient sensing control (PASC)

Control range

0°F to 200°F (–18°C to 93°C)

384

EN-DigiTraceC910series-DS-H58374

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THERMAL MANAGEMENT SOLUTIONS

Typical Enclosure Dimensions (Inches)

4.7

Roof and Gutter
De-Icing

10.9
11.7

10.25

Fire Sprinkler System
Freeze Protection

0.23

Pipe Freeze Protection
and Flow Maintenance

c910 -485

7.25

Surface Snow
Melting – MI

8.9

Monitoring
Temperature

Low alarm range 0°F to 180°F (–18°C to 82°C) or OFF
High alarm range 0°F to 200°F (–18°C to 93°C) or OFF

Ground fault

Alarm range
Trip range

Current

Low alarm range 0.3 A to 30 A or OFF

Autocycle

Diagnostic test interval adjustable from 1 to 240 minutes or 1 to 240 hours

Surface Snow
Melting – ElectroMelt

20 mA to 100 mA
20 mA to 100 mA

Temperature Sensor Inputs
Two inputs standard

Types

100 Ω platinum RTD, 3-wire, α = 0.00385 ohms/ohm/°C
Can be extended with a 3-conductor shielded cable of 20 ohms maximum per
conductor

Freezer Frost
Heave Prevention

Quantity

Alarm Outputs
AC relay

Isolated solid-state triac, SPST, 0.75 A maximum, 100 Vac to 277 Vac nominal

Dry contact relay

Pilot duty only, 48 Vac/dc, 500 mA maximum, 10 VA maximum resistive switching
Floor Heating

Note: Outputs are configurable as “open on alarm” or “close on alarm”
Programming and Setting
Method

Programmable keypad

Units

Imperial (°F, in.) or Metric (°C, mm)

Digital display

Actual temperature, control temperature, heater current, ground fault,
programming parameter values, alarm values
Heater on, alarm condition, receive / transmit data
Nonvolatile, restored after power loss, checksum data checking

THERMAL MANAGEMENT SOLUTIONS

EN-DigiTraceC910series-DS-H58374

11/13

385

Technical Data
Sheets

LEDs
Memory

c910-485
Programming and Setting
Stored parameters (measured)

Minimum and maximum temperature, maximum ground-fault current, maximum
heater current, contactor cycle count, time in use

Alarm conditions

Low / high temperature, low current
Ground-fault alarm, trip
RTD failure, loss of programmed values, or EMR failure

Other

Password protection

Connection Terminals
Power supply input

Screw terminals, 22–8 AWG

Heating cable output

Screw terminals, 22–8 AWG

Ground

Two box lugs, 14–6 AWG

RTD/alarm/communications

28–12 AWG spring clamp terminals

Mounting
Enclosure

Surface mounting with four fixing holes on 7.25 in x 11.7 in (184 mm x 297 mm) centers
Hole diameter: 0.31 in (8 mm)

Communications with C910-485
Protocol

ModBus RTU / ASCI I

Topology

Multidrop, daisy chain

Cable

Single shielded twisted pair, 26 AWG or larger

Length

4000 ft (1.2km) maximum @ 9600 baud

Quantity

Up to 32 devices without repeater

Address

Programmable

Ordering Details
DigiTrace C910-485 Single-point Heat-Tracing Control System
Description

Catalog number

DigiTrace C910-485 controller in an 8" x 10" FRP enclosure with
C910-485
polycarbonate cover. 2-pole 30 A EMR. Controls a single circuit with
a 2-pole electromechanical relay. Includes isolated 2-wite RS-485
communication board. (Approved for nonhazardous locations only)

Part number

Weight/lbs

10170-026

RTD Sensors
100-ohm platinum RTD with 10 foot stainless steel corrugated
sheath

RTD10CS

1.0

RTD, ambient, cable style

RTD-200

254741

0.1

RTD, –100°F to 900°F, pipe mounted

RTD4AL

1.2

DigiTrace ProtoNode-RER:
BACnet MST/IP and Metasys N2 protocol gateway

ProtoNode-RER

P000001227

1.3

DigiTrace ProtoNode-RER:
LonWorks protocol gateway

ProtoNode-LER

P000001228

1.3

Protocol Gateways

386

EN-DigiTraceC910series-DS-H58374

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THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection
and Flow Maintenance

ECW

-GF

-DP

The ECW-GF is housed in a NEMA 4X enclosure designed to
be wall mounted or installed on a pipe with the optional Raychem FTC-PSK pipe stand kit.
The controller includes a window and a digital display that
shows the measured temperature, set point temperature
and alarm conditions (temperature sensor failure, high or
low temperature and ground-fault) if detected.
Alarm conditions can be indicated via a Form C dry contact
connected to a building management system. Status LEDs
indicate whether the digital display is showing the set point
or actual temperature or if the controller is in an alarm
state.
The ECW-GF can be programmed to maintain temperatures
up to 200°F (93°C), at voltages from 100 to 277 V, and is
capable of switching current up to 30 amperes.

ECW-GF using a separate junction box

An optional remote display panel, the DigiTrace ECW-GF-DP,
is available. This remote display provides remote alarm
indication and ground-fault test and reset capability. The
ECW-GF-DP can be installed indoors in a standard duplex
box located up to 328 ft (100 m) from the controller.

EN-DigiTraceECWFamily-DS-H58338

11/13

387

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating

The ECW-GF is supplied with a 25-foot thermistor for line,
slab or ambient sensing temperature control.

Freezer Frost
Heave Prevention

Programming the set point temperature, deadband, and the
high and low alarm thresholds on the controllers is accomplished using the built-in digital display and push buttons. A
9-V battery connector is supplied to allow programming the
controller before the heating cable circuit power is provided.

Surface Snow
Melting – ElectroMelt

ECW-GF-DP remote display panel
available only with ECW-GF

The DigiTrace ECW-GF electronic controller provides
accurate temperature control with integrated 30-mA
ground-fault protection. The ECW-GF is ideal for pipe freeze
protection, flow maintenance, freezer frost heave, floor
heating and snow melting applications.

Surface Snow
Melting – MI

ECW-GF using RayClic power
connection kit

Product Overview

Roof and Gutter
De-Icing

ECW-GF with FTC-PSK pipe stand
and power connection kit

Fire Sprinkler System
Freeze Protection

ECW-GF, ECW-GF-DP
Digital electronic controllers and remote display panel

ecw-gf, ecw-gf-dp
ECW-GF Controller
ECW-GF without wire cover

Wire cover
Wall mounting
holes (typical 4)

TEMPERATURE

Menu
Battery connection
Remote display panel
(ECW-GF-DP only)
Thermistor terminals

Next, Up, Down

Alarm terminals

Incoming power
terminals

Setpoint

MENU
Hold 3
Seconds
Battery
Battery
Connector
Connector

Menu Settings:

Temperature

Down

Hold for
GF TEST

GF
Reset

6.3 in
(160 mm)

Display: Alarms and Status

Units (°F or °C)
Set Point
Dead Band
High Temp Alarm
Low Temp Alarm
Remote GF Panel

Heating cable
power terminals
Ground terminal

Actual

ACTUAL
SETPOINT

Actual temp LED
Set point temp LED

Display

Lid

ECW-GF
Digital Controller

with Ground-Fault Protection

Ground-fault test mode
Ground-fault circuit failure
Ground-fault cable fault
Shorted or open sensor
Remote panel comm failure
High temp alarm
Low temp alarm

ECW-GF
Digital electronic controller with equipment
ground-fault protection
Type 4X
Input: 100-277 Vac, 50/60 Hz, 30 A

WARNING
Shock Hazard

Output: 100-277 Vac, 30 A
80BJ
Enclosed Energy
Management
Equipment

Do not remove cover while energized
Ne pas enlever le couvert tant que le
régulateur est sous tension

Maximum Ambient: 140˚F (60˚C)
For maintaining temperatures up to 200˚F (93˚C)
in nonhazardous locations.
Equipment Ground-Fault Protection: 30 mA

Use only with Raychem, XL-Trace, RaySol and IceStop heating cables
and Pyrotenax MI heating cables.
© 2013 Pentair Thermal Management LLC
WWW.PENTAIRTHERMAL.COM
H58407 07/13

Stand-offs

6.3 in
(160 mm)

Note:
Next button is used for ground-fault test.
Down button is used for ground-fault reset.

General
Approvals

Nonhazardous locations

Supply voltage

100–277 Vac ±10% 50–60 Hz
Common supply for controller and heat tracing circuit

Enclosure
Protection

NEMA 4X

Material

Fiberglass reinforced polyester plastic

Entries

1 x 3/4 in (19 mm) conduit entries for power
1 x 1 in (25 mm) conduit entry for heating cable
1 x 1/2 in (13 mm) conduit entry for RTD sensor

Relative humidity

0% to 90%, noncondensing

Ambient installation and usage
temperature

–40°F to 140°F (–40°C to 60°C)

Control
Relay type

Double-pole, mechanical

Control range

32°F to 200°F (0°C to 93°C)

Deadband

Adjustable 2°F to 10°F (2°C to 6°C)

Accuracy

±3°F (1.7°C) of set point

Input power
Voltage

277 Vac nominal, 50/60 Hz maximum

Current

30 A maximum

Monitoring and alarm output
Temperature

Low alarm range: 20°F (–6°C) to set point minus deadband, or OFF
High alarm range: Set point plus (Deadband +5°F (3°C)) to 230°F, or OFF

RTD failure

Shorted or open temperature sensor

Alarm relay

Form C: 2 A at 277 Vac, 2 A at 48 Vdc

388

EN-DigiTraceECWFamily-DS-H58338

11/13

THERMAL MANAGEMENT SOLUTIONS

Temperature Sensor (included)
Input type

Thermistor 10K ohm @25C Type J

Fire Sprinkler System
Freeze Protection

Ground-fault
Ground-fault protection

30 mA fixed

Ground fault trip reset

Reset button, manual

Ground-fault test

Manual ground-fault circuitry test; automatic hourly circuitry test

Programming and Setting
°F or °C

Digital display

Four numeric display digits for parameter and error/alarm indication

LEDs

Indicate actual and set point from display and alarm state

Memory

Nonvolatile, restored after power loss

Stored parameters

Parameters can be programmed without power supply (external battery) and
parameters are stored in nonvolatile memory.

Alarm conditions

Low/high temperature and thermistor failure (open or shorted)
Ground-fault trip, ground-fault circuit failure and loss of power.

Surface Snow
Melting – MI

Programmable at controller – Push buttons on front panel

Units

Roof and Gutter
De-Icing

Method

Connection Terminals
Screw rising cage clamp, 18–6 AWG

Heating cable output

Screw rising cage clamp, 18–6 AWG

Ground

Screw rising cage clamp, 18–6 AWG

Thermistor

Screw rising cage clamp, 22–14 AWG

Alarm

Screw rising cage clamp, 22–14 AWG

Remote display panel

Screw rising cage clamp, 22–14 AWG

Surface Snow
Melting – ElectroMelt

Power supply input

ECW-GF-DP Remote Panel (for ECW-GF controller only)

G uit
g = circ
nkin or

Bli

t
Tes

lt
s
au
pas
d-F
test er
b
ault
nd-f and am-GF
rou
W
= G y red k EC
g
el c
nkin ternat ; che
Bli
al
rm
g
kin ala
Blin Other
=

3.275 in. (83.2 mm)

rro

tio

ica

r mm
we = Co
Ponking
set
Bli
Re
ult
trip
-Fa
ult re
nd
-fa
u
nd failu
Gro
rou ry

3.806 in. (96.7 mm)

-DP

GF
W-

Freezer Frost
Heave Prevention

4.110 in. (104.4 mm)

1.760 in. (44.7 mm)

Floor Heating

Gro

EN-DigiTraceECWFamily-DS-H58338

11/13

389

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection
and Flow Maintenance

ecw-gf, ecw-gf-dp

ecw-gf, ecw-gf-dp
general
Approvals

Nonhazardous locations

Environment

Indoors, dry area

Ambient operating temperature

32°F to 122°F (0°C to 50°C)

Humidity

90% noncondensing

features
LED

3 LEDs 1 green, 1 red, 1 amber

Buttons

2: Ground-fault reset, Ground-fault test

Power

Power provided from ECW-GF controller
12 Vdc @ 100 mA

Connection

8 position terminal block
8 conductor 22 AWG shielded cable Alpha - Cat No. 1298C or equivalent
328 ft (100 m) maximum

Ordering details
Description

Catalog number

Part number

Wall mounted digital electronic controller with ground fault

ECW-GF

P000000925

4.0

Remote display panel for ECW-GF

ECW-GF-DP

P000000926

0.3

Pipe mounting kit with power connection and end seal

FTC-PSK

P000000927

0.2

390

EN-DigiTraceECWFamily-DS-H58338

11/13

Weight/lbs

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection
and Flow Maintenance
Fire Sprinkler System
Freeze Protection

HTPG
heat-tracing power distribution panel for group control
Ground-fault protection, monitoring, and optional alarm panel

Door
disconnect
(optional)
Push button
for light
testing
COMMON ALARM
PUSH TO ACKNOWLEDGE

HAND/OFF/AUTO

The DigiTrace HTPG is a dedicated power distribution, control,
ground-fault protection, monitoring, and alarm panel for
freeze protection and broad temperature maintenance heattracing applications. This wall-mounted enclosure contains
an assembled circuit-breaker panelboard.
Panels are equipped with circuit breakers with or without
alarm contacts.

Surface Snow
Melting – MI

Selector
switch

POWER ON

Product Overview

Roof and Gutter
De-Icing

Alarm horn (optional)

The group control package allows the system to operate
automatically in conjunction with an external controller/
thermostat.

Alarm option shown above

Surface Snow
Melting – ElectroMelt

Main circuit
breaker
Distribution
panelboard
R AR

TB 1

7
8

Fuse holder
Terminals
(optional)

Main
contactor

Freezer Frost
Heave Prevention

Alarm relay
(optional)

Ground
bus bar

TB 2

Floor Heating

Load Power
120 / 208 / 240 / 277 Vac
Ambient Operating Temperature
32°F (0°C) to 122°F (50°C) (without space heater option)
Field Wire Size

THERMAL MANAGEMENT SOLUTIONS

EN-DigiTraceHTPG-DS-H55404

11/13

391

Technical Data
Sheets

14–8 AWG (15–30 A), 8–4 AWG (40–50 A)

htpg
Circuit Breaker Types
To comply with NEC Article 427-55(a), circuit breakers are equipped with the
means for lockout in the “Off” position.
Ground-fault breaker

Square D types QOB-EPD, EDB-EPD

Circuit Breaker Amperage Rating
120 Vac

20 A, 30 A, 40 A, 50 A

208 / 240 / 277 Vac

20 A, 30 A, 40 A, 50 A

Main Contactor
3 pole
Approvals

9700701

ETL LISTED
CONFORMS TO
ANSI/UL STD. 508
UL STD. 508A

CERTIFIED TO
CAN/CSA C22.2 NO. 14

HTPG Typical Freeze-Protection Application Schematic

Ø1 Ø2Ø3 N
Three-pole main
circuit breaker
Three-pole main
contactor

Hand

Off

Contactor
coil

Auto

External controller/
thermostat*

Panel
energized

One-pole with 30-mA
ground-fault trip
(120/277 Vac)

Alarm
remote
annunciation
(with alarm
option)

Heating cable
End seal
Freezeprotection
circuit
Braid/pipe

Two-pole with 30-mA
ground-fault trip
(208/240 Vac)

392

Power
connection

Freezeprotection
circuit

EN-DigiTraceHTPG-DS-H55404

11/13

THERMAL MANAGEMENT SOLUTIONS

HTPG Catalog Number
HTPG comes in a variety of configurations. The following chart outlines the elements that constitute a configuration and the
corresponding catalog number.

Fire Sprinkler System
Freeze Protection

HTPG - Voltage - Panelboard - C.B. type - # of C.B./# of poles (rating) - Enclosure - MCB - Options
HTPG - 277/480 - 30 - 2 - 14/1P (30) - 4X - 200 - H
Voltage
120/208

120/240*

277/480

Panelboard size
18 = 18 space panelboard (277 V only)
30 = 30 space panelboard
42 = 42 space panelboard
54 = 54 space panelboard (277 V only)

MCB
Main circuit breaker and contactor
Panelboard
size 120/208
18
50, 100
30
50, 100, 150, 200, 225
42
50, 100, 150, 200, 225
54
–

120/240
50, 100
50, 60, 80, 150, 175, 200, 225
50, 60, 80, 150, 175, 200, 225
–

277/480
30, 50, 70, 125
50, 70, 125, 175, 225
50, 70, 125, 175, 225
50, 70, 125, 175, 225

Enclosure
12 = NEMA 12 (indoors)
4 = NEMA 4 (outdoors)
4X = NEMA 4X (stainless steel–outdoors)

Surface Snow
Melting – MI

Number of circuit breakers/number of
poles (circuit breaker rating) see prior page
# of breakers (no bell alarm option)
120 V 208 V 240 V 277V
(1P)
(2P)
(2P)
(1P)
18 (1–18) (1–8) (1–8) (1–8)
30 (1–30) (1–14) (1–14) (1–14)
42 (1–42) (1–20) (1–20) (1–20)
54
–
–
–
(1–26)
# of breakers (bell alarm option)
120 V 208 V 240 V 277 V
(1P)
(2P)
(2P)
(1P)
18 (1–8) (1–6) (1–6) (1–8)
30 (1–14) (1–10) (1–10) (1–14)
42 (1–20) (1–14) (1–14) (1–20)
54
–
–
–
(1–26)

Option
0 = None
A = Alarm horn (requires C.B. type 3 or 4)
B = Alarm beacon (requires C.B. type 3 or 4)
C = Heat-trace contactor failure light
D = Door disconnect
E = Environmental purge (NEMA 4 or 4X enclosures only)
G = Panel power-on light
H = Space heater and thermostat
L = Individual circuit breaker trip indication lights (requires C.B. type 4)
P = Heat-trace energized light
T = Terminal blocks (prewired)
W = Wired for ETI controller
Z = Z-purge system (NEMA 4 or 4X enclosures only)
SP = Special requirement: Must contain complete description of variance

Roof and Gutter
De-Icing

Circuit breaker type
2 = GFCB (30-mA trip) without alarm
3 = GFCB (30-mA trip) with bell alarm
4 = GFCB (30-mA trip) with relay alarm (includes
terminal block option). Not available for 277 V

Pipe Freeze Protection
and Flow Maintenance

htpg

* Single phase

Surface Snow
Melting – ElectroMelt
Freezer Frost
Heave Prevention
Floor Heating

EN-DigiTraceHTPG-DS-H55404

11/13

393

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

SMPG1
Snow melting and de-icing power distribution and control panel
For single-phase heating cables
Product Overview

Mounting brackets

Heater
thermostat
(3R only)
Power on light

Nameplate

HTC
energized light

Door lock handle

C.B. tripped
alarm
Heater cycle
timed
control

Heater
(3R only)

The adjustable hold-on timer continues heater operation for
up to 10 hours after snow stops to ensure complete melting.

Exterior View

Snow/Ice
melt controller

EUR - 5A

Ground bar
NP

Panelboard

Control wiring
Panelboard
lugs

Interior View

394

The DigiTrace SMPG1 is a three-phase power distribution
panel for single-phase heating cables that includes groundfault protection, monitoring and control for snow melting
or roof & gutter de-icing systems. The ETI® EUR-5A snow
melting and gutter de-icing controller is included with the
SMPG. When used with one or more compatible sensors,
the EUR-5A automatically controls surface snow melting
and roof and gutter de-icing heating cables for minimum
energy costs. Applications include pavement, sidewalk,
loading dock, roof, gutter, and down spout snow/ice melting
in commercial and industrial environments.

The EUR-5A provides a complete interface for use in
environments supervised by an energy management
computer (EMC). This feature can also be used for general
purpose remote control and annunciation. All sensor and
communications wiring is NEC Class 2. This simplifies
installation while enhancing fire and shock safety. Multiple
sensors provide superior performance by better matching
the controller to site performance requirements. The EUR5A can interface up to six sensors.
For three-phase heating cable configurations, refer to the
SMPG3 data sheet (H57814). For additional information on
single-phase snow melting designs, contact your Pentair
Thermal Management representative.

EN-DigiTraceSMPG1-DS-H57680

11/13

THERMAL MANAGEMENT SOLUTIONS

SMPG1
Indoor installation (NEMA 1/12): 14°F (–10°C) to 122°F (50°C)
Outdoor installation (NEMA 3R/4): –40°F (–40°C) to 122°F (50°C)

(Includes space heater and thermostat)

Main contactor

3-pole 100 A or 200 A

Main circuit breaker (optional)

Square D type HDL (15–150 A) 3-pole
Square D type JDL (150–200 A) 3-pole

Operating heating cable voltage

208 or 277 V, single phase

Branch ground-fault breaker

Square D type QOB-EPD / EDB-EPD

Circuit breaker rating

15–50 A

Field wire size

#12–8 AWG (15–30 A C.B.), #8–2 AWG (40–50 A C.B.)

Fire Sprinkler System
Freeze Protection

Ambient operating temperature

Pipe Freeze Protection
and Flow Maintenance

smpg1

Roof and Gutter
De-Icing

Approvals

UL STD. 508A
CAN/CSA C22.2 NO. 14

Ground-Fault Protection
Surface Snow
Melting – MI

N
Incoming
power
Remote annunciation alarm
(circuit breaker
with alarm type #3)

Fuse

Slab
temperature sensor

Control transformer
GIT-1

EUR-5A SNOW SWITCH

24 V

AUTOMATIC SNOW/ICE MELTING CONTROL PANEL

SUPPLY
SNOW/ICE

8
10

HEATER
CYCLE

HOURS
60°F
55°F

HEATER

50°F
45°F

65°F

Gutter
ice sensor

Aerial
CIT-1 snow sensor

70°F
75°F
80°F
85°F

TEMPERATURE

Three-pole main contactor

Surface Snow
Melting – ElectroMelt

Main circuit breaker (optional)

SIT-6E

Freezer Frost
Heave Prevention

One-pole with 30-mA
ground-fault trip (277 V)

Pavement-mounted
sensor

Single Ø
connection

GND
Braid

Floor Heating

EN-DigiTraceSMPG1-DS-H57680

11/13

395

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

smpg1
Catalog number
SMPG1 comes in a variety of configurations. The following chart outlines the elements that constitute a configuration and
the corresponding catalog number. If standard configurations do not meet your needs, custom SMPG panels are available
and processed under the catalog number SMPG-GENERAL, part number P000000763. Please contact your Pentair Thermal
Management representative for a custom SMPG panel quotation. Non-standard configurations will carry ETL Certification,
not a UL Listing.
SMPG1 – Voltage – Circuit breaker type – Number of circuit breakers/Number of poles (rating) – Enclosure – Contactor Size
SMPG1 – 277 – 2 – 12/1P (40) – 1 – 200 – Options: (MCB)
Voltage
208 V (Single phase)
277 V (Single phase)

Main Circuit Breaker
MCB = Optional Main Circuit Breaker Included
Contactor Size

Circuit breaker type
2 = Ground-fault circuit breaker
(30-mA trip) without alarm
3 = Ground-fault circuit breaker
(30-mA trip) with alarm
*Number of circuit breakers/
Number of poles (circuit breaker rating)
208 V (2 pole)
# of
Available
C.B.
C.B. ratings (A)

277 V (1 pole)
# of
Available
C.B.
C.B. ratings (A)

6
12

6
12
18

15, 20, 25, 30, 40, 50
15, 20, 25, 30, 40, 50

15, 20, 30, 40, 50
15, 20, 30, 40, 50
15, 20, 30, 40, 50

Contactor
size (A)

# of
breakers

100
200
200

6
12
18

Enclosure
1
= NEMA 1/12 (indoors)
3R
= NEMA 3R/4 (outdoors) Includes heater

*Warning: Confirm the total load (A)
does not exceed contactor rating.

Main Circuit Breakers
Installed in Control Panel
MCB rating

Voltage

Catalog number

Part number

50 A

120–600 V

HDL36050

T1010097

100 A

120–600 V

HDL36100

T1010101

110 A

120–600 V

HDL36110

T1010102

125 A

120–600 V

HDL36125

T1009792

150 A

120–600 V

HDL36150

T1010087

175 A

120–600 V

JDL36175

T1010053

200 A

120–600 V

JDL36200

T1010103

225 A

120–600 V

JDL36225

T1009945

250 A

480 or 600 V

JDL36250

T1010104

EUR-5A
Supply voltage/max current

21 to 28 Vac/2 A

Control transformer

Included

Operating temperature

–40°F (–40°C) to 140°F (60°C)

Hold on time adjustment

0 to 10 hours

High temperature limit adjustment

40°F (4°C) to 90°F (32°C)

Moisture/temperature sensors

Up to six can be used simultaneously. Members of the CIT-1/GIT-1/SIT-6E family
in any combination. Locate up to 2,000 ft (609.6 m) for EUR-5A.

Ambient temperature sensor

Included

Remote interface

RCU-3 Remote Control Unit (can operate up to 500 ft [152 m] from panel)

Building/Energy management
computer interface

5 Vdc @ 10 mA

396

EN-DigiTraceSMPG1-DS-H57680

11/13

THERMAL MANAGEMENT SOLUTIONS

Power Distribution
Catalog Number

Part Number Description

Pipe Freeze Protection
and Flow Maintenance

smpg1

SMPG1 Snow Melting and De-Icing Power Distribution and Control Panel - NEMA 1/12
P000000456

SMPG with (6) 15–50 A ground-fault breakers, 100 A contactor

SMPG1-208-2-12/2P(XX)-1-200

P000000457

SMPG with (12) 15–50 A ground-fault breakers, 200 A
contactor

SMPG1-208-3-6/2P(XX)-1-100

P000000458

SMPG with (6) 15–50 A ground-fault breakers with alarm, 100
A contactor

SMPG1-208-3-12/2P(XX)-1-200

P000000459

SMPG with (12) 15–50 A ground-fault breakers with alarm, 200
A contactor

SMPG1-277-2-6/1P(XX)-1-100

P000000460

SMPG with (6) 15–50 A ground-fault breakers, 100 A contactor

SMPG1-277-2-12/1P(XX)-1-200

P000000461

SMPG with (12) 15–50 A ground-fault breakers, 200 A
contactor

SMPG1-277-2-18/1P(XX)-1-200

P000000462

SMPG with (18) 15–50 A ground-fault breakers, 200 A
contactor

SMPG1-277-3-6/1P(XX)-1-100

P000000463

SMPG with (6) 15–50 A ground-fault breakers with alarm, 100
A contactor

SMPG1-277-3-12/1P(XX)-1-200

P000000464

SMPG with (12) 15–50 A ground-fault breakers with alarm, 200
A contactor

SMPG1-277-3-18/1P(XX)-1-200

P000000465

SMPG with (18) 15–50 A ground-fault breakers with alarm, 200
A contactor

Roof and Gutter
De-Icing

SMPG1-208-2-6/2P(XX)-1-100

Fire Sprinkler System
Freeze Protection

208 V 2-pole NEMA 1 enclosure

277 V 1-pole NEMA 1 enclosure

Surface Snow
Melting – MI

SMPG1 Snow Melting and De-Icing Power Distribution and Control Panel - NEMA 3R/4
208 V 2-pole NEMA 3R enclosure
SMPG1-208-2-6/2P(XX)-3R-100

P000000466

SMPG with (6) 15–50 A ground-fault breakers, 100 A contactor
SMPG with (12) 15–50 A ground-fault breakers, 200 A
contactor

SMPG1-208-3-6/2P(XX)-3R-100

SMPG with (6) 15–50 A ground-fault breakers with alarm, 100
A contactor

P000000468

SMPG1-208-3-12/2P(XX)-3R-200 P000000469

Surface Snow
Melting – ElectroMelt

SMPG1-208-2-12/2P(XX)-3R-200 P000000467

SMPG with (12) 15–50 A ground-fault breakers with alarm, 200
A contactor

277 V 1-pole NEMA 3R enclosure
SMPG1-277-2-6/1P(XX)-3R-100

P000000470

SMPG with (6) 15–50 A ground-fault breakers, 100 A contactor
SMPG with (12) 15–50 A ground-fault breakers, 200 A
contactor

SMPG1-277-2-18/1P(XX)-3R-200 P000000472

SMPG with (18) 15–50 A ground-fault breakers, 200 A
contactor

SMPG1-277-3-6/1P(XX)-3R-100

SMPG with (6) 15–50 A ground-fault breakers with alarm, 100
A contactor

P000000473

SMPG with (12) 15–50 A ground-fault breakers with alarm, 200
A contactor

SMPG1-277-3-18/1P(XX)-3R-200 P000000475

SMPG with (18) 15–50 A ground-fault breakers with alarm, 200
A contactor

Floor Heating

SMPG1-277-3-12/1P(XX)-3R-200 P000000474

Freezer Frost
Heave Prevention

SMPG1-277-2-12/1P(XX)-3R-200 P000000471

Accessories
Catalog number

Part number

Pavement-mounted sensor

SIT-6E

P000000112

Aerial snow sensor

CIT-1

512289

Gutter ice sensor

GIT-1

126795

EUR-5A

T0001527

Replacement Controller
Snow melting and gutter de-icing
controller
THERMAL MANAGEMENT SOLUTIONS

EN-DigiTraceSMPG1-DS-H57680

11/13

397

Technical Data
Sheets

ETI Sensors

smpg3
Snow melting and de-icing power distribution and control panel
For three-phase heating cables
Product Overview

Mounting
brackets
Nameplate
HTC
energized
light
Power on
light

Heater thermostat (3R only)
Door lock
handle
NP

Alarm
acknowledge
C.B. tripped
alarm

Heater
cycle
timed
control

Heater
(3R only)

The adjustable hold-on timer continues heater operation for
up to 10 hours after snow stops to ensure complete melting.

Exterior View

Snow/Ice
melt
controller

Control power
transformer

EUR - 5A

PDB

Control
wiring

GFS1

GFS2

GFS3 HTC

CB1

CB2

CB3

Ground bar

Interior View

Main breaker
(optional)
Power
distribution
block
Ground-fault
sensors
Heat trace
contactor

398

The DigiTrace SMPG3 is a three-phase power distribution
panel for three-phase heating cables that includes ground-fault
protection, monitoring and control for snow melting or roof
and gutter de-icing systems. The ETI® EUR-5A snow melting
and gutter de-icing controller is included with the SMPG.
When used with one or more compatible sensors, the EUR-5A
automatically controls surface snow melting and roof and
gutter de-icing heating cables for minimum energy costs.
Applications include pavement, sidewalk, loading dock, roof,
gutter, and down spout snow/ice melting in commercial and
industrial environments.

Branch
breakers
(3 pole)

The calibrated 40°F to 90°F (4°C to 32°C) high limit slab
sensor prevents excessive temperatures when using
constant wattage and MI heating cables. It also permits safe
testing at outdoor temperatures too high for continuous
heater operation. The temperature sensor is included.
The EUR-5A provides a complete interface for use in
environments supervised by an energy management
computer (EMC). This feature can also be used for general
purpose remote control and annunciation. All sensor and
communications wiring is NEC Class 2. This simplifies
installation while enhancing fire and shock safety. Multiple
sensors provide superior performance by better matching
the controller to site performance requirements. The EUR5A can interface up to six sensors.
For single-phase heating cable configurations, refer to the
SMPG1 data sheet (H57680). For additional information on
three-phase snow melting designs, contact your Pentair
Thermal Management representative.

EN-DigiTraceSMPG3-DS-H57814

11/13

THERMAL MANAGEMENT SOLUTIONS

SMPG3

Main contactor

3-pole 100 A or 200 A

Main circuit
(15–150 A) 3-pole
breaker (optional) (150–200 A) 3-pole

Square D type HDL (Installed in panel when ordered/needed)
Square D type JDL (Installed in panel when ordered/needed)

Operating heating cable voltage

208, 480, or 600 V, three phase

Branch ground-fault breaker

Square D type QOB-1021 (15A–100 A) for 208 V
Square D type HDL-1021 (15A–150 A) for 600 V
JDL-1021 (160–200)
(All the above are Shunt trip C.B. with external ground-fault sensor)

Circuit breaker rating

15–150 A

Field wire size
(Copper wires)

#12–8 AWG (15–30 A C.B.), #8–2 AWG (40–50 A C.B.),
#6–1/0 AWG (60–100 A C.B.), #1/0 AWG–350 kcmil (150 A C.B.)
To comply with NEC Article 427-55(a), all circuit breakers are equipped with the
means for lockout in the “Off” position.

Roof and Gutter
De-Icing

Indoor installation (NEMA 1/12): 14°F (–10°C) to 122°F (50°C)
Outdoor installation (NEMA 3R/4): –40°F (–40°C) to 122°F (50°C)

(Includes space heater and thermostat)

Fire Sprinkler System
Freeze Protection

Ambient operating temperature

Pipe Freeze Protection
and Flow Maintenance

smpg3

Approvals
Surface Snow
Melting – MI

UL STD. 508A
CAN/CSA C22.2 NO. 14

Ground-Fault Protection

SMPG3 Snow Melting and Roof and Gutter De-Icing Control Schematic
Main circuit breaker (optional)
N
Incoming
power

Slab
temperature sensor

Control transformer
GIT-1

EUR-5A SNOW SWITCH

24 V

AUTOMATIC SNOW/ICE ME
LTING CONTROLPANEL
2

SUPPLY
SNOW/ICE

HOURS
60°F
55°F

HEATER

50°F

65°F

70°F
75°F
80°F
85°F

TEMPERATURE

Three-pole main contactor

Gutter
ice sensor

Aerial
CIT-1 snow sensor

HEATER
CYCLE

45°F

Three-pole circuit breaker
with shunt trip/external
ground-fault sensor

SIT-6E

Pavement-mounted
sensor

Junction box

To ground-fault module

A1
B1
C1

Ground

Junction box

To ground-fault module
Three-pole circuit breaker
with shunt trip/external
ground-fault sensor

Ground

EN-DigiTraceSMPG3-DS-H57814

Heating
cables

Terminal block

11/13

3 Ø Delta
connected
heating
cables

Junction box

3 Ø Wye connected
heating cables

399

Technical Data
Sheets

Current
transformers

Floor Heating

Current
transformers

THERMAL MANAGEMENT SOLUTIONS

Freezer Frost
Heave Prevention

Remote annunciation alarm
(circuit breaker
with alarm type #3)

Fuse

Surface Snow
Melting – ElectroMelt

smpg3
Catalog number
SMPG3 comes in a variety of configurations. The following chart outlines the elements that constitute a configuration and
the corresponding catalog number. If standard configurations do not meet your needs, custom SMPG panels are available
and processed under the catalog number SMPG-GENERAL, part number P000000763. Please contact your Pentair Thermal
Controls representative for a custom SMPG panel quotation. Non-standard configurations will carry ETL Certification, not a
UL Listing.
SMPG3 – Voltage – Circuit breaker type – Number of circuit breakers/Number of poles (rating) – Enclosure – Contactor size
SMPG3 – 208 – 3 – 2/3P (80) – 3R – 200 – Options: (MCB)
Voltage
208 V (Three phase)
480 V (Three phase)
600 V (Three phase)

Main Circuit Breaker
MCB = Optional Main Circuit Breaker Included
Contactor Size
Contactor
size (A)
100
200
100
200
100
200

Circuit breaker type
3 = 3-pole circuit breaker w/shunt trip and
external ground-fault sensor with alarm
*Number of circuit breakers/
Number of poles (circuit breaker rating)
208 V (3 pole)
# of
Available
C.B.
C.B. ratings (A)

480 V or 600 V (3 pole)
# of Available
C.B. C.B. ratings (A)

1
2
3

15–100
15–150
15–150

# of
breakers
1
1
2
2
3
3

Breakers
size (A)
25, 30, 40, 50, 60, 70, 80, 100
150
25, 30, 40, 50
60, 70, 80, 100
25, 30
40, 50, 60

Enclosure
1/12 = NEMA 1/12 (indoors)
3R/4 = NEMA 3R/4 (outdoors)

15–100
15–150
15–150

*Warning: Confirm the total load (A) does not exceed contactor rating.

EUR-5A
Supply voltage/max current

21 to 28 Vac/2 A

Control transformer

Included

Operating temperature

–40°F (–40°C) to 140°F (60°C)

Hold on time adjustment

0 to 10 hours

High temperature limit adjustment

40°F (4°C) to 90°F (32°C)

Moisture/temperature sensors

Up to six can be used simultaneously. Members of the CIT-1/GIT-1/SIT-6E family
in any combination. Locate up to 2,000 ft (609.6 m) for EUR-5A.

Ambient temperature sensor

Included

Remote interface

RCU-3 Remote Control Unit (can operate up to 500 ft [152 m] from panel)

Building/energy management
computer interface

5 Vdc @ 10 mA

Main Circuit Breakers
Installed in Control Panel
MCB rating

Voltage

Catalog number

Part number

50 A

120–600 V

HDL36050

T1010097

100 A

120–600 V

HDL36100

T1010101

110 A

120–600 V

HDL36110

T1010102

125 A

120–600 V

HDL36125

T1009792

150 A

120–600 V

HDL36150

T1010087

175 A

120–600 V

JDL36175

T1010053

200 A

120–600 V

JDL36200

T1010103

225 A

120–600 V

JDL36225

T1009945

250 A

480 or 600 V

JDL36250

T1010104

400

EN-DigiTraceSMPG3-DS-H57814

11/13

THERMAL MANAGEMENT SOLUTIONS

Power Distribution
Catalog Number

Part Number

Description

Pipe Freeze Protection
and Flow Maintenance

smpg3

SMPG3 Snow Melting and De-Icing Power Distribution and Control Panel - NEMA 1/12
P000000476

SMPG with (1) 15–100 A breaker, GF sensor with alarm, 100 A
contactor

SMPG3-208-3-1/3P(XX)-1-200

P000000477

SMPG with (1) 15–150 A breaker, GF sensor with alarm, 200 A
contactor

SMPG3-208-3-2/3P(XX)-1-100

P000000478

SMPG with (2) 15–100 A breakers, GF sensor with alarm, 100 A
contactor

SMPG3-208-3-2/3P(XX)-1-200

P000000479

SMPG with (2) 15–150 A breakers, GF sensor with alarm, 200 A
contactor

SMPG3-208-3-3/3P(XX)-1-100

P000001381

SMPG with (3) 15–100 A breakers, GF sensor with alarm, 100 A
contactor

SMPG3-208-3-3/3P(XX)-1-200

P000000480

SMPG with (3) 15–150 A breakers, GF sensor with alarm, 200 A
contactor

Roof and Gutter
De-Icing

SMPG3-208-3-1/3P(XX)-1-100

Fire Sprinkler System
Freeze Protection

208 V 3-pole NEMA 1/12 Enclosure

480 V 3-pole NEMA 1/12 Enclosure
SMPG with (1) 15–100 A breaker, GF sensor with alarm, 100 A
contactor

SMPG3-480-3-1/3P(XX)-1-200

P000001382

SMPG with (1) 15–150 A breaker, GF sensor with alarm, 200 A
contactor

SMPG3-480-3-2/3P(XX)-1-100

P000000482

SMPG with (2) 15–100 A breakers, GF sensor with alarm, 100 A
contactor

SMPG3-480-3-2/3P(XX)-1-200

P000000483

SMPG with (2) 15–150 A breakers, GF sensor with alarm, 200 A
contactor

SMPG3-480-3-3/3P(XX)-1-100

P000001383

SMPG with (3) 15–100 A breakers, GF sensor with alarm, 100 A
contactor

SMPG3-480-3-3/3P(XX)-1-200

P000000484

SMPG with (3) 15–150 A breakers, GF sensor with alarm, 200 A
contactor

Surface Snow
Melting – ElectroMelt

P000000481

Surface Snow
Melting – MI

SMPG3-480-3-1/3P(XX)-1-100

600 V 3-pole NEMA 1/12 Enclosure
P000000494

SMPG with (1) 15–100 A breaker, GF sensor with alarm, 100 A
contactor

SMPG3-600-3-1/3P(XX)-1-200

P000001384

SMPG with (1) 15–150 A breaker, GF sensor with alarm, 200 A
contactor

SMPG3-600-3-2/3P(XX)-1-100

P000000495

SMPG with (2) 15–100 A breakers, GF sensor with alarm, 100 A
contactor

SMPG3-600-3-2/3P(XX)-1-200

P000000496

SMPG with (2) 15–150 A breakers, GF sensor with alarm, 200 A
contactor

SMPG3-600-3-3/3P(XX)-1-100

P000000497

SMPG with (3) 15–100 A breakers, GF sensor with alarm, 100 A
contactor

SMPG3-600-3-3/3P(XX)-1-200

P000000498

SMPG with (3) 15–150 A breakers, GF sensor with alarm, 200 A
contactor

Freezer Frost
Heave Prevention

SMPG3-600-3-1/3P(XX)-1-100

Floor Heating

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

smpg3
Power Distribution
Catalog Number

Part Number

Description

SMPG3 Snow Melting and De-Icing Power Distribution and Control Panel - NEMA 3R/4
208 V 3-pole NEMA 3R/4 Enclosure
SMPG3-208-3-1/3P(XX)-3R-100 P000000485

SMPG with (1) 15–100 A breaker, GF sensor with alarm, 100 A
contactor

SMPG3-208-3-1/3P(XX)-3R-200 P000000486

SMPG with (1) 15–150 A breaker, GF sensor with alarm, 200 A
contactor

SMPG3-208-3-2/3P(XX)-3R-100 P000000487

SMPG with (2) 15–100 A breakers, GF sensor with alarm, 100 A
contactor

SMPG3-208-3-2/3P(XX)-3R-200 P000000488

SMPG with (2) 15–150 A breakers, GF sensor with alarm, 200 A
contactor

SMPG3-208-3-3/3P(XX)-3R-100 P000001385

SMPG with (3) 15–100 A breakers, GF sensor with alarm, 100 A
contactor

SMPG3-208-3-3/3P(XX)-3R-200 P000000489

SMPG with (3) 15–150 A breakers, GF sensor with alarm, 200 A
contactor

480 V 3-pole NEMA 3R/4 Enclosure
SMPG3-480-3-1/3P(XX)-3R-100 P000000490

SMPG with (1) 15–100 A breaker, GF sensor with alarm, 100 A
contactor

SMPG3-480-3-1/3P(XX)-3R-200 P000001386

SMPG with (1) 15–150 A breaker, GF sensor with alarm, 200 A
contactor

SMPG3-480-3-2/3P(XX)-3R-100 P000000491

SMPG with (2) 15–100 A breakers, GF sensor with alarm, 100 A
contactor

SMPG3-480-3-2/3P(XX)-3R-200 P000000492

SMPG with (2) 15–150 A breakers, GF sensor with alarm, 200 A
contactor

SMPG3-480-3-3/3P(XX)-3R-100 P000001387

SMPG with (3) 15–100 A breakers, GF sensor with alarm, 100 A
contactor

SMPG3-480-3-3/3P(XX)-3R-200 P000000493

SMPG with (3) 15–150 A breakers, GF sensor with alarm, 200 A
contactor

600 V 3-pole NEMA 3R/4 Enclosure
SMPG3-600-3-1/3P(XX)-3R-100 P000000499

SMPG with (1) 15–100 A breaker, GF sensor with alarm, 100 A
contactor

SMPG3-600-3-1/3P(XX)-3R-200 P000001388

SMPG with (1) 15–150 A breaker, GF sensor with alarm, 200 A
contactor

SMPG3-600-3-2/3P(XX)-3R-100 P000000500

SMPG with (2) 15–100 A breakers, GF sensor with alarm, 100 A
contactor

SMPG3-600-3-2/3P(XX)-3R-200 P000000501

SMPG with (2) 15–150 A breakers, GF sensor with alarm, 200 A
contactor

SMPG3-600-3-3/3P(XX)-3R-100 P000000502

SMPG with (3) 15–100 A breakers, GF sensor with alarm, 100 A
contactor

SMPG3-600-3-3/3P(XX)-3R-200 P000000503

SMPG with (3) 15–150 A breakers, GF sensor with alarm, 200 A
contactor

Accessories
ETI sensors

Catalog number

Part number

Pavement-mounted sensor

SIT-6E

P000000112

Aerial snow sensor

CIT-1

512289

Gutter ice sensor

GIT-1

126795

EUR-5A

T0001527

Replacement controller
Snow melting and gutter de-icing
controller

402

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THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection
and Flow Maintenance
Fire Sprinkler System
Freeze Protection

APS-3C
Snow melting and gutter de-icing controller

The ETI® APS–3C snow melting and gutter de-icing
controller when used with compatible sensors automatically
controls surface snow melting and roof and gutter de-icing
heating cables, ensuring minimum operating costs. Typical
applications include pavement, sidewalk, loading dock, roof,
gutter, and down spout snow/ice melting.

The APS–3C provides a relay closure interface for use
with energy management computers (EMC). This feature
can also be used for general purpose remote control and
annunciation and other advanced applications.

2.125 in 2.125 in
(54mm) (54mm)

3 x 3/4 in (21mm)
Conduit Entry

2.3125 in
(59mm)

All sensor and communications wiring is NEC Class 2. This
simplifies installation while enhancing fire and shock safety.
Multiple sensors provide superior performance by better
matching the controller to site performance requirements.
The APS–3C can interface up to six sensors.
The APS-3C does not provide ground-fault protection for the
heating cable system. This protection is required and must
be provided by other devices such as ground-fault circuit
breakers or other control methods.

9.125 in
(232mm)

6.562 in
(167mm)

EN-ETIAPS3C-DS-H58111

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating

The APS–3C is an exceptionally capable surface snow
melting and roof and gutter de-icing controller. For complete
information describing its application, installation, and
features, please contact your Pentair Thermal Management
representative or visit our web site at www.pentairthermal.com.

Freezer Frost
Heave Prevention

11.500 in
(292mm)

Surface Snow
Melting – ElectroMelt

The calibrated 40°F to 90°F (4°C to 32°C) high limit
thermostat prevents excessive temperatures when using
constant wattage and MI heating cables. It also permits safe
testing at outdoor temperatures too high for continuous
heater operation. The temperature sensor is included.

Surface Snow
Melting – MI

1.3125 in
(33mm)

The adjustable hold-on timer continues heater operation for
up to 10 hours after snow stops to ensure complete melting.
The optional RCU–3 Remote Control Unit can be located
where system operation can be conveniently observed. It
duplicates many of the controls and indicators on the
APS-3C front panel. It is used to clear tracked and drifting
snow that may not land on a sensor.

Roof and Gutter
De-Icing

Product Overview

aps-3C
General
Area of use

Nonhazardous locations

Approvals
Type 873
Temperature Regulating Equipment
109R

Enclosure
Protection

NEMA 3R

Cover attachment

Hinged polycarbonate cover, lockable

Entries

Three 1-1/16" entries

Material

Polycarbonate

Mounting

Wall mounted

Control
Supply voltage

APS-3C-120 V:
120 V 50/60 Hz
APS-3C-208/240 V: 208/240 V 50/60 Hz

Contact type

Form C

Maximum ratings

Voltage: 240 V
Current: 24 A

Heater hold-on timer

0 to 10 hours; actuated by snow stopping or toggle switch

System test

Switch toggles the heater contact on and off. If temperature exceeds high limit,
heater cycles to prevent damage.

Snow/Ice Sensors
Sensor input

Up to 6 sensors; CIT-1, GIT-1, SIT-6E

Circuit type

NEC Class 2

Lead length

Up to 500 ft (152 m) using 18 AWG 3-wire jacketed cable
Up to 2,000 ft (609 m) using 12 AWG 3-wire jacketed cable

High Limit Thermostat
Adjustment range

40°F to 90°F (4°C to 32°C)

Dead band

1°F (0.6°C)

Sensor type

Thermistor

Circuit type

NEC Class 2

Lead length

Up to 500 ft (152 m) using 18 AWG 2-wire jacketed cable
Up to 1,000 ft (504 m) using 12 AWG 2-wire jacketed cable

Energy Management Computer (EMC) Interface
Inputs

OVERRIDE ON (10 mA dry switch contact)
OVERRIDE OFF (10 mA dry switch contact)

Outputs

SUPPLY
SNOW
HEAT
HIGH TEMP
REMOTE

(10 mA dry switch contact)
(10 mA dry switch contact)
(10 mA dry switch contact)
(10 mA dry switch contact)
(10 mA dry switch contact)

Environmental
Operating temperature

–40°F to 160°F (–40°C to 71°C)

Storage temperature

–50°F to 180°F (–45°C to 82°C)

404

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Ordering Details
Part number

Description

APS-3C-120V

P000000781

APS-3C Snow Melting and De-Icing Controller, 120 V

APS-3C-208/240V

P000000782

APS-3C Snow Melting and De-Icing Controller, 208/240 V

CIT-1

512289-000

CIT-1 Snow sensor

GIT-1

126795-000

GIT-1 Gutter sensor

SIT-6E

P000000112

SIT-6E Pavement snow sensor

RCU-3

P000000883

RCU-3 Remote control unit

Snow/Ice Sensors

Fire Sprinkler System
Freeze Protection

Catalog number

Pipe Freeze Protection
and Flow Maintenance

aps-3c

Roof and Gutter
De-Icing
Surface Snow
Melting – MI

Limited Warranty
ETI’s two year limited warranty covering defects in workmanship and materials
applies.
Surface Snow
Melting – ElectroMelt
Freezer Frost
Heave Prevention
Floor Heating

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THERMAL MANAGEMENT SOLUTIONS

APS-4C
Snow melting and gutter de-icing controller
With ground-fault protection
Product Overview
The ETI® APS–4C snow melting and gutter de-icing
controller with ground-fault protection, when used with one
or more compatible sensors, automatically controls surface
snow melting and roof and gutter de-icing heating cables
for minimum energy costs. Applications include pavement,
sidewalk, loading dock, roof, gutter, and down spout snow/
ice melting in commercial and industrial environments.

1.3125 in
(33mm)

2.125 in 2.125 in
(54mm) (54mm)
11.500 in
(292mm)
3 x 3/4 in (21mm)
Conduit Entry

2.3125 in
(59mm)

9.125 in
(232mm)

The APS–4C provides advanced patented and patent pending
ground-fault equipment protection (GFEP) as required by
the national electrical codes. The GFEP automatically tests
itself every time the contactors operate and once every 24
hours. The trip current can be set at 60 or 120 mA via a DIP
an internal switch or retained at the 30 mA default value.
As an aid to troubleshooting heating cable ground faults,
the APS–4C provides an output that can indicate the ground
current on a service person’s portable DVM.
The calibrated 40°F to 90°F (4°C to 32°C) high limit
thermostat prevents excessive temperatures when using
constant wattage and MI heating cables. It also permits safe
testing at outdoor temperatures too high for continuous
heater operation. The temperature sensor is included.
The APS–4C provides a complete interface for use in
environments supervised by an energy management
computer (EMC). This feature can also be used for general
purpose remote control and annunciation.
All sensor and communications wiring is NEC Class 2. This
simplifies installation while enhancing fire and shock safety.
Multiple sensors provide superior performance by better
matching the controller to site performance requirements.
The APS–4C can interface up to six sensors.

6.562 in
(167mm)

406

The adjustable hold-on timer continues heater operation for
up to 10 hours after snow stops to ensure complete melting.
The optional RCU–4 Remote Control Unit can be located
where system operation can be conveniently observed. It
duplicates many of the APS–4C front panel functions.

The APS–4C is an exceptionally capable surface snow
melting and roof and gutter de-icing controller. For complete
information describing its application, installation and
features, please contact your Pentair Thermal Management
representative or visit our web site at www.pentairthermal.com.

EN-ETIAPS4C-DS-H58112

11/13

THERMAL MANAGEMENT SOLUTIONS

General
Area of use

Nonhazardous locations

Approvals
109R

Enclosure
NEMA 3R

Cover attachment

Hinged polycarbonate cover, lockable

Entries

One 1-1/16" entry (top) for NEC Class 2 connections
Two 1-11/16" entries (bottom) for supply and load power, except 277 V single phase
Two 1-1/16" entries (bottom) for supply and load power, 277 V single phase only

Material

Polycarbonate

Mounting

Wall mounted

Control
APS-4C-208/240 V: 208–240 V 50/60 Hz 3-phase
APS-4C-277 V:
277 V 50/60 Hz single phase
APS-4C-277/480 V: 277/480 V 50/60 Hz 3-phase
APS-4C-600 V:
600 V 50/60 Hz 3-phase

Contact type

3 Form A

Maximum ratings

Voltage: 600 V
Current: 50 A except 277 V single phase, 40 A for 277 V single phase

Heater hold-on timer

0 to 10 hours; actuated by snow stopping or toggle switch

System test

Switch toggles the heater contact on and off. If temperature exceeds high limit,
heater cycles to prevent damage.

Surface Snow
Melting – MI

Supply voltage

Roof and Gutter
De-Icing

Protection

Fire Sprinkler System
Freeze Protection

Type 873
Temperature Regulating Equipment

Pipe Freeze Protection
and Flow Maintenance

aps-4c

Ground-Fault Equipment Protection (GFEP)
30 mA (default); 60 mA and 120 mA selectable by DIP switch

Automatic self-test

Mode A: Verifies GFEP function before contactors operate
Mode B: Verifies GFEP and heaters every 24 hours

Manual test/reset

Toggle switch provided for this function

Maintenance facility

DC output proportional to ground current provided for troubleshooting the heater
system

Surface Snow
Melting – ElectroMelt

Set point

Snow/Ice Sensors
Up to 6 sensors: CIT-1, GIT-1, SIT-6E

Circuit type

NEC Class 2

Lead length

Up to 500 ft (152 m) using 18 AWG 3-wire jacketed cable
Up to 2,000 ft (609 m) using 12 AWG 3-wire jacketed cable

Freezer Frost
Heave Prevention

Sensor input

High Limit Thermostat
40°F to 90°F (4°C to 32°C)

Dead band

1°F (0.6°C)

Circuit type

Thermistor

Sensor interface

NEC Class 2

Lead length

Up to 500 ft (152 m) using 18 AWG 2-wire jacketed cable
Up to 1,000 ft (504 m) using 12 AWG 2-wire jacketed cable

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Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating

Adjustment range

aps-4C
Energy Management Computer (EMC) Interface
Inputs

OVERRIDE ON (10 mA dry switch contact)
OVERRIDE OFF (10 mA dry switch contact)

Outputs

SUPPLY
SNOW
HEAT
HIGH TEMP
REMOTE

(10 mA dry switch contact)
(10 mA dry switch contact)
(10 mA dry switch contact)
(10 mA dry switch contact)
(10 mA dry switch contact)

Environmental
Operating temperature

–40°F to 160°F (–40°C to 71°C)

Storage temperature

–50°F to 180°F (–45°C to 82°C)

Ordering Details
Catalog number

Part number

Description

APS-4C-208/240V

P000000783

APS-4C Snow melting and de-icing controller with
ground-fault protection, 208-240 Vac 50/60 Hz three
phase

APS-4C-277V

P000000784

APS-4C Snow melting and de-icing controller with
ground-fault protection, 277 Vac 50/60 Hz single phase

APS-4C-277V/480V

P000000785

APS-4C Snow melting and de-icing controller with
ground-fault protection, 277/480 Vac 50/60 Hz three
phase

APS-4C-600V

P000000786

APS-4C Snow melting and de-icing controller with
ground-fault protection, 600 Vac 50/60 Hz three phase

CIT-1

512289-000

CIT-1 Snow sensor

GIT-1

126795-000

GIT-1 Gutter sensor

SIT-6E

P000000112

SIT-6E Pavement snow sensor

RCU-4

P000000884

RCU-4 Remote control unit

Snow/Ice Sensors

Limited Warranty
ETI’s two year limited warranty covering defects in workmanship and materials
applies.

408

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THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection
and Flow Maintenance
Fire Sprinkler System
Freeze Protection

SC-40C
Snow and ice melting satellite contactor

The SC–40C provides Ground-Fault Equipment Protection
(GFEP) as required by the national electrical codes. Upon
sensing a ground-fault condition, the SC–40C inhibits
operation of its contactor until manually reset. Circuits
without a ground fault continue to operate normally, thus
partitioning defective heating cables.

1.3125 in
(33mm)

2.125 in 2.125 in
(54mm) (54mm)

3 x 3/4 in (21mm)
Conduit Entry

2.3125 in
(59mm)

9.125 in
(232mm)

For complete information describing its application,
installation and features, please contact your Pentair
Thermal Management representative or visit our web site at
www.pentairthermal.com.

6.562 in
(167mm)

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating

Each SC–40C maintains communications to and from the
APS–4C using a 3-wire cable. Thus, the APS–4C alarms
ground faults occurring anywhere in the system. This
feature inserts a short time delay between the operation
of each contactor, thus improving power quality by limiting
the inrush current. The RCU–4 remote control unit supplied
permits overriding zone control in applications requiring the
capability.

Freezer Frost
Heave Prevention

Each SC–40C provides a complete energy management
computer (EMC) interface. This feature provides remote
access for advanced applications requiring remote or zone
control along with remote annunciation.

11.500 in
(292mm)

Surface Snow
Melting – ElectroMelt

The adjustable hold-on timer continues heater operation
on each SC–40C for up to 10 hours after snow stops to
ensure complete melting and to compensate for differences
between zones. The optional RCU–4 remote control unit
can be located where system operation can be conveniently
observed. It duplicates many of the controls and indicators
on the SC–40C front panel.

Surface Snow
Melting – MI

The ETI® SC–40C snow and ice melting satellite contactor
answers the need for cost effective modular snow melting
heater control. One or more SC–40Cs, when used with an
APS–4C control panel acting as the master control, allow
for modular snow melting system design. There is no limit
to the number of SC–40Cs that can be interfaced in a single
system. This approach reduces front end design, hardware,
and installation costs while providing a number of useful
features that would be otherwise too expensive and complex
to implement.

Roof and Gutter
De-Icing

Product Overview

SC-40C
General
Area of use

Nonhazardous locations

Approvals

Type 873
Temperature Regulating Equipment
109R

Enclosure
Protection

NEMA 3R

Cover attachment

Hinged polycarbonate cover, lockable

Entries

Material

Polycarbonate

Mounting

Wall mounted

Communications Bus
Number of cascaded units

Unlimited

Contactor delay

5 seconds

Bus-wire type

3-wire jacketed cable

Circuit type

NEC Class 2

Lead length

Up to 500 ft (152 m) using 18 AWG 3-wire jacketed cable
Up to 1,000 ft (504 m) using 12 AWG 3-wire jacketed cable

Control
Supply voltage

SC-40C 208/240 V:
SC-40C 277 V:
SC-40C 277/480 V:
SC-40C 600 V:

208–240 V 50/60 Hz 3-phase
277 V 50/60 Hz single phase
277/480 V 50/60 Hz 3-phase
600 V 50/60 Hz 3-phase

Contact type

3 Form A

Maximum ratings

Voltage: 600 V
Current: 50 A except 277 V single phase, 40 A for 277 V single phase

Heater hold-on timer

0 to 10 hours; actuated by snow stopping or toggle switch

System test

Switch toggles the heater contact on and off. If temperature exceeds high limit,
heater cycles to prevent damage.

Ground-Fault Equipment Protection (GFEP)
Set point

30 mA (default); 60 mA and 120 mA selectable by DIP switch

Automatic self-test

Mode A: Verifies GFEP function before contactors operate
Mode B: Verifies GFEP and heaters every 24 hours

Manual test/reset

Toggle switch provided for this function

Maintenance facility

DC output proportional to ground current provided for troubleshooting the heater
system

High Limit Thermostat
Adjustment range

40°F to 90°F (4°C to 32°C)

Dead band

1°F (0.6°C)

Sensor type

Thermistor

Circuit type

NEC Class 2

Lead length

Up to 500 ft (152 m) using 18 AWG 2-wire jacketed cable
Up to 1,000 ft (504 m) using 12 AWG 2-wire jacketed cable

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Energy Management Computer (EMC) Interface
Inputs

OVERRIDE ON (10 mA dry switch contact)
OVERRIDE OFF (10 mA dry switch contact)

Outputs

SUPPLY
SNOW
HEAT
HIGH TEMP
REMOTE

Fire Sprinkler System
Freeze Protection

(10 mA dry switch contact)
(10 mA dry switch contact)
(10 mA dry switch contact)
(10 mA dry switch contact)
(10 mA dry switch contact)

Environmental
Operating temperature

–40°F to 160°F (–40°C to 71°C)

Storage temperature

–50°F to 180°F (–45°C to 82°C)

Pipe Freeze Protection
and Flow Maintenance

SC-40C

Part number

Description

SC-40C 208/240V

P000000787

SC-40C Satellite Contactor, 208-240 Vac 50/60 Hz three
phase

SC-40C 277V

P000000788

SC-40C Satellite Contactor, 277 Vac 50/60 Hz single
phase

SC-40C 277/480V

P000000789

SC-40C Satellite Contactor, 277/480 Vac 50/60 Hz three
phase

SC-40C 600V

P000000790

SC-40C Satellite Contactor, 600 Vac 50/60 Hz three
phase

CIT-1

512289-000

CIT-1 Snow sensor

GIT-1

126795-000

GIT-1 Gutter sensor

SIT-6E

P000000112

SIT-6E Pavement snow sensor

RCU-4

P000000884

RCU-4 Remote control unit

Snow/ice sensors (not included)

Surface Snow
Melting – MI

Catalog number

Roof and Gutter
De-Icing

Ordering Details

Surface Snow
Melting – ElectroMelt
Freezer Frost
Heave Prevention

Limited Warranty

EN-ETISC40C-DS-H58113

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411

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating

ETI’s two year limited warranty covering defects in workmanship and materials
applies.

PD Pro
Automatic snow and ice melting controller
Product Overview
The ETI® PD Pro is an automatic snow and ice melting
controller for pavement, sidewalks, loading docks, roofs,
gutters and downspouts in commercial and residential
environments.

TE
H EA

The PD Pro interfaces with up to two sensors, (any
combination of CIT-1, GIT-1 or SIT-6E) to meet site
requirements. The controller features automatic and
manual-override operator controls. The adjustable Hold-On
timer continues heater operation up to 8 hours after the
sensors stop detecting snow or ice to ensure the rest of the
slab has completely dried. The Heater Cycle control button
allows manual initiation or cancellation of a heating cycle.
The optional RCU–3 remote control unit can be located
for convenient monitoring and control. These flexible
control options provide complete snow melting and water
evaporation at a low operating cost.

7-7/16 in
(189 mm)

Snow Switch® PD Pro™
Snow & Ice Control

SUPPLY

SUPPLY : 120 VAC, 50/60 Hz
LOAD : 120 VAC, 7 AMP MAX. INDUCTIVE
LOAD : 120 VAC, 30 AMP MAX. RESISTIVE

4-1/4 in
(108 mm)

HEAT

The PD Pro is housed in an environmentally-sheltered
Type 4X enclosure and weighs only 3 pounds. The PD Pro
is a snow and ice controller for medium-sized applications
whose features and power requirements do not require an
APS or EUR Series control panel. For complete information
describing application, installation, and features, please
contact your Pentair Thermal Management representative or
visit www.pentairthermal.com.

SNOW

WARNING
DANGER OF ELECTRICAL SHOCK OR
ELECTROCUTION
Lethal voltages are present beneath this cover.
Service by qualified personnel only. More than
one disconnect may be required to de-energize
this control for servicing.

HOLD-ON TIME (HRS)

HEATER CYCLE

1-1/16 in
(27 mm)
Conduit Entry
4 in
(102 mm)

General
Area of use
Approvals

Nonhazardous locations
Type 873
Temperature Regulating Equipment
109R
Also evaluated by Underwriters Laboratories Inc in accordance
with UL 1053 Ground-Fault Sensing and Relaying Equipment

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Enclosure
Type 4X

Dimensions

5 1/2” (L) x 8 1/8” (W) x 4 3/8” (H)
140 mm (L) x 207 mm (W) x 112 mm (H)

Material

Polycarbonate

Cover attachment

Polycarbonate cover, machine screws

Weight

3 pounds (not including sensors)

Mounting

Wall mount

Entries

2 x 3/4” entries (right) for NEC Class 2 connections
3 x 1-1/16” entries (bottom and left) for supply and load power

Fire Sprinkler System
Freeze Protection

Protection

120 Vac; 50/60 Hz

Load

30 A maximum resistive
7 A maximum inductive

Heater Hold-On timer

0 – 8 hrs; actuated by snow stopping or toggle switch

System test

Switch toggles heater contact on and off. If temperature exceeds optional high limit
thermistor (45°F), heater shuts off to reduce costs and prevent damage

Roof and Gutter
De-Icing

Control
Supply voltage

Surface Snow
Melting – MI

Front Panel Interface
Status indicators

SUPPLY (green): Power on
HEAT (yellow): Heating cycle in progress
SNOW (yellow): Sensor(s) detect snow

Environmental
Operating temperature

–31°F to 130°F (–35°C to 55°C)

Storage temperature

–67°F to 167°F (–55°C to 75°C)

Part number

Description

PD Pro*

P000001508

Automatic Snow and Ice Melting Controller

CIT-1*

512289-000

Aerial Snow Sensor

GIT-1*

126795-000

Gutter Ice Sensor

SIT-6E*

P000000112

Pavement Mounted Snow and Ice Sensor

Surface Snow
Melting – ElectroMelt

Ordering Information
Catalog number

Pipe Freeze Protection
and Flow Maintenance

pd pro

* The PD Pro does not come with any sensors. Sensors must be ordered separately.
Freezer Frost
Heave Prevention
Floor Heating

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

GF Pro
Automatic snow and ice melting controller
Product Overview
The ETI® GF Pro is an automatic snow and ice melting
controller for pavement, sidewalks, loading docks, roofs,
gutters and downspouts in commercial and residential
environments.
The GF Pro interfaces with up to two sensors, (any combination
of CIT-1, GIT-1 or SIT-6E) to meet site requirements. The
controller features automatic and manual-override operator
controls. The adjustable Hold-On timer continues heater
operation up to 8 hours after the sensors stop detecting snow
or ice to ensure the rest of the slab has completely dried.
The Heater Cycle control button allows manual initiation or
cancellation of a heating cycle. The optional RCU–4 remote
control unit can be located for convenient monitoring and
control. These flexible control options provide complete snow
melting and water evaporation at a low operating cost.

7-7/16 in
(189 mm)
Snow Switch® GF Pro™
Snow & Ice Control with GFEP

SUPPLY : 200-277 VAC, 50/60 Hz
LOAD : 200-277 VAC, 30 AMP MAX. RESISTIVE

SUPPLY

HEAT

SNOW

GFEP

Ground Fault Detection/Interuption Leakage: 30 mA

4-1/4 in
(108 mm)

This device provides the Equipment Ground
Fault Protection required by Article 426.28 of
the National Electric Code. This Device does
not provide Personal GFCI protection.
WARNING
DANGER OF ELECTRICAL SHOCK OR
ELECTROCUTION
Lethal voltages are present beneath this cover.
Service by qualified personnel only. More than
one disconnect may be required to de-energize
this control for servicing.

The GF Pro also features a built-in 30 mA, self-testing GroundFault Equipment Protection (GFEP) capability, digitally filtered to
minimize false tripping. A ground-fault alarm must be manually
reset using the Test/Reset switch before heater operation can
continue.

HOLD-ON TIME (HRS)

HEATER GFEP
CYCLE TEST/
RESET

1-1/16 in
(27 mm)
Conduit Entry

The GF Pro is housed in an environmentally-sheltered Type 4X
enclosure and weighs only 3 pounds. The GF Pro is a snow and
ice controller for medium-sized applications whose features
and power requirements do not require an APS or EUR Series
control panel. For complete information describing application,
installation, and features, please contact your Pentair Thermal
Management representative or visit www.pentairthermal.com.

4"
(10 2 mm)

General
Area of use

Nonhazardous locations

Approvals
Type 873
Temperature Regulating Equipment
109R
Also evaluated by Underwriters Laboratories Inc in accordance
with UL 1053 Ground-Fault Sensing and Relaying Equipment

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Enclosure
Type 4X

Dimensions

5 1/2” (L) x 8 1/8” (W) x 4 3/8” (H)
140 mm (L) x 207 mm (W) x 112 mm (H)

Material

Polycarbonate

Cover attachment

Polycarbonate cover, machine screws

Weight

3 pounds (not including sensors)

Mounting

Wall mount

Entries

2 x 3/4” entries (right) for NEC Class 2 connections
3 x 1-1/16” entries (bottom and left) for supply and load power

Fire Sprinkler System
Freeze Protection

Protection

200 – 277 Vac; 50/60 Hz

Load

30 A maximum resistive

Heater Hold-On timer

0 – 8 hrs; actuated by snow stopping or toggle switch

System test

Switch toggles heater contact on and off. If temperature exceeds optional high limit
thermistor (45°F), heater shuts off to reduce costs and prevent damage

Roof and Gutter
De-Icing

Control
Supply voltage

Pipe Freeze Protection
and Flow Maintenance

gf pro

Front Panel Interface
SUPPLY (green): Power on
HEAT (yellow): Heating cycle in progress
SNOW (yellow): Sensor(s) detect snow
GFEP (red): Ground-Fault condition
GFEP (red, flashing): Failed
GFEP (red, rapid flashing): GFEP test in progress

Surface Snow
Melting – MI

Status indicators

Ground-Fault Equipment Protection (GFEP)
30 mA

Automatic self-test

GFEP verified before contactors operate; GFEP runs on start-up and every 24 hours

Manual Test/Reset

Test/Reset switch on front panel

Surface Snow
Melting – ElectroMelt

Set point

Environmental
Operating temperature

–31°F to 130°F (–35°C to 55°C)

Storage temperature

–67°F to 167°F (–55°C to 75°C)

Ordering Information
Part number

Description

GF Pro*

P000001509

Automatic Snow and Ice Melting Controller

CIT-1*

512289-000

Aerial Snow Sensor

GIT-1*

126795-000

Gutter Ice Sensor

SIT-6E*

P000000112

Pavement Mounted Snow and Ice Sensor

Freezer Frost
Heave Prevention

Catalog number

* The GF Pro does not come with any sensors. Sensors must be ordered separately.

Floor Heating

EN-ETIGFPRO-DS-H58849

11/13

415

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

rm-3
Automatic gutter de-icing controller
Product Overview
The RM-3 automatic gutter ice controllers include the
GIT®‑1 gutter ice sensor to detect and melt snow and ice
from roofs, gutters, and downspouts.
AT

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The dual-action GIT-1 sensor detects both moisture and
temperature, so the heaters run only when moisture is
detected at or below 38°F (3.3°C). The built-in, fixed, 3-hour
Hold-On Timer provides for a heating cycle long enough
to fully melt snow and ice and keep them from refreezing.
The Heater Cycle toggle switch allows manual activation or
cancellation of heater operation. The included GIT-1 gutter
ice sensor detects ice and snow as moisture at or below
38°F (3.3°C), so the RM-3 system could save hundreds of
dollars a year compared to using just a simple thermostat
alone to control the system.

ED
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8.125 in
(206.4 mm)
7.375 in
(187.3 mm)

The RM-3 system is housed in an environmentally-sheltered
NEMA 4X enclosure to provide various installation options.
The RM-3 automatic gutter ice systems are designed
for years of maintenance-free operation and can save
thousands of dollars in unnecessary repairs, as well as
actual loss of use of the building, structure, or facility.

RM-3

Snow & Ice Control

5.5 in
(139.7 mm)

SUPPLY: 120 VAC, 50/60 Hz
LOAD: 120 VAC, 7 AMP MAX. INDUCTIVE
LOAD: 120 VAC, 24 AMP MAX. RESISTIVE
USE ONLY COPPER CONDUCTORS HAVING
SUFFICIENT AMPACITY.
SEE INSTALLATION INSTRUCTIONS.

4.25 in
(108.0 mm)

SUPPLY

HEAT

SNOW

WARNING
DANGER OF ELECTRICAL SHOCK OR
ELECTROCUTION

Features and benefits include:
HEATER CYCLE

Environmental Technology, Inc.

• Energy efficient, automatic controls for gutter and downspout applications

US
LISTED
109R

1 in (25.4 mm)
cutout 12 ft (3.6m) jacketed
3 conductor #18
AWG cable

• Heating based on snow & ice / temperature sensor input
for optimum efficiency
• Low cost operation compared to thermostat control alone

5.56 in
(141.2mm)
Ambient air
temperature
sensor
0.81 in
(20.6mm)

4.06 in
(103.2 mm)

• Heater Cycle switch for manual activation or cancelation
of heater operation
1.12 in
(28.5mm)

Mounting clamp
(removable)

For complete information describing application, installation
and features, please contact your Pentair Thermal
Management representative or visit
www.pentairthermal.com.

1.50 in
(38.1mm)

Heated moisturesensing grid

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THERMAL MANAGEMENT SOLUTIONS

General
Area of use

Nonhazardous

Approvals

Fire Sprinkler System
Freeze Protection

Type 873
Temperature Regulating Equipment
109R

Enclosure
IP66 NEMA 4X

Dimensions

5 1/2 in (L) X 8 1/8 in (W) X 4 3/8 in (H)

Material

Polycarbonate

Cover attachment

Polycarbonate cover, machine screws

Weight

3 pounds (control box alone);
3.8 pounds (with included GIT-1 sensor)

Mounting

Wall mount

Roof and Gutter
De-Icing

Protection

Front Panel Interface
Status indicator

Pipe Freeze Protection
and Flow Maintenance

rm-3

SUPPLY (green, solid) power on
HEAT (yellow) call for heat
SNOW (yellow) system sensor detects moisture

120 Vac; 50/60 Hz

Heater

120 Vac;
24 A maximum resistive
7 A maximum inductive
Polycarbonate
–35°F to 130°F (–31°C to 55°C)

Storage temperature

–67°F to 167°F (–55°C to 75°C)

Surface Snow
Melting – ElectroMelt

Environmental
Operating temperature

Surface Snow
Melting – MI

Control
Supply voltage

Ordering Information
Catalog number

Part number

Description

RM-3

P000001366

Gutter de-icing controller

Freezer Frost
Heave Prevention
Floor Heating

EN-ETIRM3-DS-H58747

11/13

417

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

rm-4
Automatic gutter de-icing controller
Product Overview
The RM-4 automatic gutter ice controllers include the
GIT®‑1 gutter ice sensor to detect and melt snow and ice
from roofs, gutters, and downspouts.
AT

The dual-action GIT-1 sensor detects both moisture and
temperature, so the heaters run only when moisture is
detected at or below 38°F (3.3°C). The built-in, fixed, 3-hour
Hold-On Timer provides for a heating cycle long enough
to fully melt snow and ice and keep them from refreezing.
The Heater Cycle toggle switch allows manual activation or
cancelation of heater operation. The included GIT-1 gutter
ice sensor detects ice and snow as moisture at or below
38°F (3.3°C), so the RM-4 system could save hundreds of
dollars a year compared to using just a simple thermostat
alone to control the system.

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The RM-4 system is housed in an environmentally-sheltered
NEMA 4X enclosure to provide various installation options.
The RM-4 automatic gutter ice systems are designed
for years of maintenance-free operation and can save
thousands of dollars in unnecessary repairs, as well as
actual loss of use of the building, structure, or facility.

8.125 in
(206.4 mm)
7.375 in
(187.3 mm)
RM-4

Snow & Ice Control with GFEP

5.5 in
(139.7 mm)

SUPPLY: 208-240 VAC, 50/60 Hz
HEATER: 208-240 VAC, 24 AMP MAX. RESISTIVE

USE ONLY COPPER CONDUCTORS HAVING
SUFFICIENT AMPACITY.
SEE INSTALLATION INSTRUCTIONS.

4.25 in
(108.0 mm)

SUPPLY

HEAT

SNOW

GFEP

WARNING
DANGER OF ELECTRICAL SHOCK OR
ELECTROCUTION

Environmental Technology, Inc.

Features and benefits include:
HEATER
CYCLE

1 in (25.4 mm)
cutout 12 ft (3.6m) jacketed
3 conductor #18
AWG cable

GFEP
TEST/
RESET

C
LISTED
109R

• Heating based on snow & ice / temperature sensor input
for optimum efficiency

4.06 in
(103.2 mm)

• Low cost operation compared to thermostat control alone

5.56 in
(141.2mm)

Ambient air
temperature
sensor
0.81 in
(20.6mm)

• Energy efficient, automatic controls for gutter and downspout applications

• Heater Cycle switch for manual activation or cancelation
of heater operation
1.12 in
(28.5mm)

Mounting clamp
(removable)
1.50 in
(38.1mm)

• RM-4 Ground-fault Equipment Protection (GFEP) circuitry
performs an automatic self-test upon start-up and automatically every 24 hours, eliminating the need to perform
manual ground-fault testing
For complete information describing application, installation
and features, please contact your Pentair Thermal
Management representative or visit
www.pentairthermal.com.

Heated moisturesensing grid

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General
Area of use

Nonhazardous

Approvals

Fire Sprinkler System
Freeze Protection

Type 873
Temperature Regulating Equipment
109R

Enclosure
IP66 NEMA 4X

Dimensions

5 1/2 in (L) X 8 1/8 in (W) X 4 3/8 in (H)

Material

Polycarbonate

Cover attachment

Polycarbonate cover, machine screws

Weight

3 pounds (control box alone);
3.8 pounds (with included GIT-1 sensor)

Mounting

Wall mount

Roof and Gutter
De-Icing

Protection

Front Panel Interface
Status indicator

Surface Snow
Melting – MI

SUPPLY (green, solid) power on
HEAT (yellow) call for heat
SNOW (yellow) system sensor detects moisture
GFEP (red) ground-fault condition
GFEP (red, flashing) failed
GFEP (red, flashing, rapid) GFEP test in progress

Control
Supply voltage

208–240 Vac; 50/60 Hz

Heater

208–240 Vac;
24 A maximum resistive

Pipe Freeze Protection
and Flow Maintenance

rm-4

Ground-fault equipment protection
30 mA

Automatic self-test

GFEP verified before contactors operate; GFEP runs on power start-up and
automatically every 24 hours

Manual test/rest

Test/rest switch on front panel

Environmental

Polycarbonate

Operating temperature

–35°F to 130°F (–31°C to 55°C)

Storage temperature

–67°F to 167°F (–55°C to 75°C)

Surface Snow
Melting – ElectroMelt

Set point

Freezer Frost
Heave Prevention

Ordering Information
Catalog number

Part number

Description

RM-4

P000001367

Gutter de-icing controller with GFEP

Floor Heating

EN-ETIRM4-DS-H58748

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

CIT-1, GIT-1, SIT-6e
Snow and ice melting Sensors
CIT-1 snow sensor, GIT-1 gutter sensor, SIT-6E pavement sensor
Product Overview

GIT-1

The ETI® CIT–1, GIT–1 and SIT–6E snow and ice melting
sensors combine to reliably detect moisture and
temperature for surface snow melting and roof and gutter
de-icing applications. The CIT–1 sensor may be paired with
either the GIT–1 sensor for gutter applications or the SIT–6E
sensor for pavement applications. These sensors detect
precipitation as snow at temperatures below 38°F (3.3°C).
Control panels are signaled only if moisture occurs below
this temperature, thus saving energy and ensuring reliable
ice melting. They provide the industry’s most versatile and
cost effective automatic snow melting control when used
with any APS or EUR series control panel.
Reliability and sensitivity are key features in the CIT–1, GIT–1
and SIT–6E sensors. The solid state design, combined with
a rugged housing and epoxy potting, ensure many years of
trouble free service. Precision precipitation and temperature
sensing provide the sensitivity required for effective
automatic control. All three are NEC Class 2 low voltage
device which simplifies installation.

CIT-1

The CIT–1, GIT–1 and SIT–6E’s unique microcontroller
design frees their moisture sensors from ice bridging. Ice
bridging happens if incomplete melting occurs near the
heater or sensor leaving an air space. The air insulates thus
preventing effective heater and sensor operation. Additional
features prevent heater operation under conditions
favorable to heater ice tunneling.
The CIT–1 aerial snow sensor detects falling or blowing
precipitation before snow or ice begin to accumulate. This
allows the control panel to begin managing the system. This
sensor may be roof or mast mounted.
The GIT–1 mounts directly in gutters and down spouts
sensing actual environmental conditions.

SIT-6E

The SIT–6E accurately measures pavement temperature
while reliably detecting snow and ice conditions on pavement
surfaces. A built-in hold‑on timer in the SIT–6E keeps
heaters operating for an hour after snow stops to help
ensure complete snow melting. Mounting these sensors
close to the deicing heaters ensures that pavement and
sensor become dry at about the same time.
An adjustable mounting system aligns the SIT–6E with the
pavement surface. Six conduit locations add to installation
flexibility. The sensor subassembly is field replaceable without
disturbing the pavement.

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Sensors are easy to install and may be mounted up to 2000
ft (609 m) from a control panel. A combination of up to six
sensors may be used with a control panel to best match site
performance requirements.

For complete information describing applications,
installation and features, please contact your Pentair
Thermal Management representative or visit our web site
at www.pentairthermal.com.

Fire Sprinkler System
Freeze Protection

General
Area of use
CIT–1

Gutters or pavement (in conjunction with GIT–1 or SIT–6E)

GIT–1

Gutters

SIT–6E

Pavement

Pipe Freeze Protection
and Flow Maintenance

cit-1, git-1, sit-6e

Heater hold-on time
None
None

SIT–6E

1 hour

Activation temperature

Roof and Gutter
De-Icing

CIT–1
GIT–1

38°F (3.37°C)

Connections
NEC Class 2

Supply voltage

24 Vac (supplied by panel)

Output signal

Voltage drop

Bus wire type

3-wire jacketed cable

Lead length

Up to 2,000 ft (609 m) using 12 AWG 3-wire jacketed cable
Up to 500 ft (152 m) using 18 AWG 3-wire jacketed cable

Surface Snow
Melting – MI

Circuit type

Environmental
Operating temperature

–40°F to 160°F (–40°C to 71°C)

Storage temperature

–50°F to 180°F (–45°C to 82°C)

Part number

Description

CIT-1

512289-000

CIT-1 Snow sensor

GIT-1

126795-000

GIT-1 Gutter sensor

SIT-6E

P000000112

SIT-6E Pavement snow sensor

Surface Snow
Melting – ElectroMelt

Ordering Details
Catalog number

Limited Warranty
Freezer Frost
Heave Prevention

ETI’s two-year limited warranty covering defects in workmanship and materials
applies.

Floor Heating

EN-ETICIT1GIT1SIT6E-DS-H58114

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421

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

ec-ts
ambient, pipe or slab sensing electronic thermostat
With 25 foot temperature sensing lead
Product Overview
The DigiTrace EC-TS electronic thermostat is an ambient,
pipe or slab sensing thermostat that is ideal for pipe
freeze protection, flow maintenance, freezer frost heave,
floor heating and snow melting applications. The EC-TS
can be used to control a single heat-tracing -circuit or
as a pilot control of a contactor switching multiple heattracing circuits. The temperature set point can be visually
checked through the clear lid, as can the LED indicators
for alarm, power and heating cable status. The stainless
steel temperature sensor makes it an ideal thermostat for
applications that require an embedded sensor.
General

Wire Cover

Area of use

Ordinary area, outdoor

Approvals

Supply voltage

100–277 Vac ±10% 50–60 Hz.
Auto ranging
Common supply for controller and
heat-tracing circuit

!
est

Enclosure

EC-TS without Wire Cover

4.8 in
122 mm

Protection

NEMA 4X

Cover attachment

Captive stainless steel screws

Entries

2 x 1/2 in conduit entries for power
1 gland entry for the sensor

Material

Polycarbonate

Mounting

Wall mounted

Relative humidity

0% to 90%, noncondensing

Ambient installation
and usage
temperature

–40°F to 140°F (–40°C to 60°C)

4.72 in
120 mm

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Control
30 A, 277 Vac

Switch type

SPST (normally open)

Deadband

–0°F, +3°F (–0°C, +1.7°C)

Set point accuracy

±3°F (1.7°C)

Adjustable temperature range

30°F to 110°F (–1°C to 43°C)

Fire Sprinkler System
Freeze Protection

Max. switching current

Monitoring
Shorted or open sensor

Units

°F and °C

LEDs

Green LED for power available
Green LED for heating cable on
Red LED for sensor failure

Roof and Gutter
De-Icing

Sensor failure

Temperature Sensor
Thermistor – 0.2°C, 10K ohm, Curve “A”

Construction

3 wire (twisted shielded pair plus ground)

Exposure temperature

Minimum: –40°F (–40°C)
Maximum: 212°F (100°C)

Sensor sheath

304 stainless steel

Sensor diameter

0.25 in (0.63 cm)

Sensor length

2 in (5.1 cm)

Leads

20 AWG stranded, PVC overall jacket

Lead length

25 ft (7.6 m)

Surface Snow
Melting – MI

Type

Surface Snow
Melting – ElectroMelt

The sensor cable may be extended to a maximum of 100 ft (30 m) using a 3 wire (twisted shielded pair plus ground) with a
wire gauge size of 20 AWG or larger.
Connection Terminals
Power supply input

Screw Rising Cage Clamp, 18 – 6 AWG

Heating cable output

Screw Rising Cage Clamp, 18 – 6 AWG

Ground

Screw Rising Cage Clamp, 18 – 6 AWG

Thermistor (sensor)

Screw Rising Cage Clamp, 22 – 14 AWG

Pipe Freeze Protection
and Flow Maintenance

ec-ts

Description

Catalog number

Part number

Weight/lbs

Electronic thermostat with 25 ft sensing lead

EC-TS

P000001115

1.2

MI cable grounding kit (required if installing MI heating cable)

MI-GROUND-KIT

P000000279

0.2

Pipe support bracket

SB-110

707366

1.0

Freezer Frost
Heave Prevention

Ordering Details

Spare Parts and Accessories

11/13

423

Technical Data
Sheets

EN-DigiTraceECTS-DS-H57460

Floor Heating

THERMAL MANAGEMENT SOLUTIONS

AMC-F5
fixed set point freeze protection thermostat
For nonhazardous locations
Product Overview

The DigiTrace AMC-F5 thermostat is designed to
control heat-tracing systems used for freeze protection
in nonhazardous locations. The thermostat has a fixed set
point of 40°F (5°C) and can be used for ambient-sensing or
line-sensing. It can be used to control a single heat-tracing
circuit or as a pilot control of a contactor switching multiple
heat-tracing circuits.
Specifications

3.2 in
(81 mm)

0.3 in
(8 mm)

2.5 in
(64 mm)

0.3 in (8 mm)

4.5 in
(114 mm)

3.1 in
(80 mm)

1.1 in (28 mm) hole
for 3/4-in (19 mm)
conduit top of box

5.2 in
(132 mm)

0.2 in (6 mm)
mounting hole
(2X)
0.2 in (6 mm)
(2X)

Enclosure

NEMA 4X, UV-resistant
thermoplastics

Entries

One 3/4-in (19 mm) through hole

Set point

40°F (5°C) nonadjustable

Sensor exposure limits

–30°F to 140°F (–34°C to 60°C)

Housing exposure limits

–30°F to 140°F (–34°C to 60°C)

Switch

SPST

Electrical rating

22 A at 125 / 250 / 480 Vac

Accuracy

±3°F (±1.7°C)

Deadband

2°F to 12°F (1.1°C to 6.7°C)
above actuation temperature

Set point repeatability

±3°F (±1.7°C)

Sensor type

Fluid-filled (silicone) bulb and
2.5 ft (0.8 m) capillary

Sensor material

Tin-plated copper

Connection

Two 14 AWG (2 mm2) pigtails
One ground screw

Approvals

2.5 in (64 mm)

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Pipe Freeze Protection
and Flow Maintenance
Fire Sprinkler System
Freeze Protection

AMC-1A
ambient-sensing thermostat for nonhazardous locations

The DigiTrace AMC-1A ambient-sensing thermostat is
designed to control heat-tracing systems used for freeze
protection in nonhazardous locations. The thermostat
responds to ambient temperature changes and has an
adjustable set point. The AMC-1A can be used to control a
single heat-tracing circuit or as a pilot control of a
contactor switching multiple heat-tracing circuits.

Roof and Gutter
De-Icing

Product Overview

4.9 in (124 mm)
4.5 in (114 mm)
4.0 in (102 mm)

4.5 in
(114 mm)

8.0 in
(202 mm)

5.6 in
(142 mm)

3.0 in (76 mm)

Entries

One 3/4-in (19 mm) NPT
conduit hub

Set point range

15°F to 140°F (–9°C to 60°C)

Sensor exposure limits

–40°F to 160°F (–40°C to 71°C)

Housing exposure limits

–40°F to 160°F (–40°C to 71°C)

Switch

SPDT

Electrical rating

22 A at 125 / 250 / 480 Vac

Accuracy

±6°F (±3.3°C)

Deadband

2°F to 12°F (1.1°C to 6.7°C)
above actuation temperature

Set point repeatability

±3°F (±1.7°C)

Sensor type

Fixed fluid-filled (silicone) bulb
and capillary

Sensor material

300 series stainless steel

Connection terminals

Screw terminals, 10–14 AWG
(2–5 mm2)

0.3 in (9 mm)

Freezer Frost
Heave Prevention

0.28 in (7 mm)
mounting holes (2X)

Adjusting
knob

Removable
knob cover

NEMA 4X, polyurethane-coated
cast-aluminum housing,
stainless-steel hardware

Surface Snow
Melting – ElectroMelt

4.0 in
(102 mm)

Enclosure

Surface Snow
Melting – MI

Specifications

Approvals
Floor Heating

Terminal
block

1.2 in
(30 mm)
3/4 in (19 mm)
NPT conduit entry
0.8 in
(20 mm)

EN-DigiTraceAMC1A-DS-H55199

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

AMC-1B
line-sensing thermostat
For nonhazardous locations
Product Overview
The DigiTrace AMC-1B line-sensing thermostat is designed
to control heat-tracing systems in nonhazardous locations.
The AMC-1B senses pipe or tank wall temperatures and can
be used to control a single heat-tracing circuit or as a pilot
control of a contactor switching multiple heat-tracing
circuits. It can also be used to indicate low-temperature or
high-temperature alarm conditions.

Specifications
Enclosure

NEMA 4X, polyurethane-coated castaluminum housing, stainless steel
hardware

4.5 in (114 mm)

Entries

One 3/4-in NPT conduit hub

4.0 in (102 mm)

Set point range

25°F to 325°F (–4°C to 163°C)

Sensor exposure
limits

–40°F to 420°F (–40°C to 215°C)

Housing exposure
limits

–40°F to 160°F (–40°C to 71°C)

Switch

SPDT

Electrical rating

22 A at 125 / 250 / 480 Vac

Accuracy

±6°F (±3.3°C)

Deadband

2°F to 12°F (1.1°C to 6.7°C) above
actuation temperature

Set point
repeatability

±3°F (±1.7°C)

Sensor type

Fluid-filled (silicone) bulb and 9 ft
(2.7 m) capillary

Sensor material

300 series stainless steel

Connection
terminals

Screw terminals, 10–14 AWG
(2–5 mm2)

4.0 in
(102 mm)
4.5 in
(114 mm)
5.6 in
(142 mm)

8.0 in
(202 mm)

Removable
knob cover

Adjusting
knob

3.0 in
(76 mm)
0.3 in
(9 mm)
Terminal
block

1.2 in
(30 mm)
3/4 in
NPT (19 mm)
conduit entry

426

0.28 in (7 mm)
mounting holes
(2X)

Approvals

0.8 in
(20 mm)

EN-DigiTraceAMC1B-DS-H55200

11/13

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection
and Flow Maintenance
Fire Sprinkler System
Freeze Protection

Protonode
Multi-Protocol device server
ProtoNode-RER and ProtoNode-LER

A0
A1
A2
A3
A4
A5
A6
A7

PROTOCESSOR
SERIAL ETHERNET

PROTONODE

B0
B1
B2
B3
S0
S1
S2
S3

PROTOCESSOR
LONWORKS ®

B0
B1
B2
B3
S0
S1
S2
S3

By FieldServer Technologies
www.ProtoCessor.com

PROTONODE

By FieldServer Technologies
www.ProtoCessor.com

RS 485 GND
RS 485 RS 485+

+PWR
- PWR
FRAME GND

ProtoNode-RER

ProtoNode-LER

Ethernet (TCP/IP)
Serial to
LonWorks

BACnet IP
Ethernet
to Serial

ProtoNode-LER

ProtoNode-RER

ProtoNode-RER: Provides support for Modbus RTU to
BACnet MS/TP, BACnet IP (BTL Certified), and Metasys
N2 protocol translation. The gateway features an ARM9
processor for fast performance and includes two RS-485 and
one Ethernet ports.
ProtoNode-LER: Provides support for Modbus RTU to
LonWorks protocol translation. The gateway features an
ARM7 processor for fast performance and includes one
serial, one RS-485, one Ethernet and one LonWorks ports.
Features and benefits:

LonWorks
BACnet MS/TP
Metasys N2 by JCI

• The most flexible and versatile multiprotocol device server on the market

To C910-485 and
ACCS-30
controllers

• BACnet International’s BTL Certification makes the
ProtoNode-RER the most reliable gateway on the market
• Dip switch selectable configuration files simplify the
ProtoNode installation
• Multi-client and multi-server support ensures interoperability between any Industrial and or Building Automation
protocols

Floor Heating

• Flash upgradable

Freezer Frost
Heave Prevention

To C910-485 and
ACCS-30 controllers

Pentair Thermal Management and FieldServer Technologies
developed the DigiTrace ProtoNode-RER and DigiTrace
ProtoNode-LER pre-programmed with the C910 and ACS-30
Modbus® maps for simple integration into your BMS. The
field protocol, DigiTrace controller, Mac address, node ID
and baud rate are DIP switch selectable. One ProtoNode can
connect one ACS-30 system or up to eight C910 controllers.

Surface Snow
Melting – ElectroMelt

BMS

GUI
Modbus TCP

+PWR
- PWR
FRAME GND

The DigiTrace ProtoNode is an external, high performance
multi-protocol gateway for customers needing protocol
translation between Building Management Systems (BMS)
using LonWorks®, BACnet® or Metasys® N2 and the
DigiTrace C910 or ACS-30 controllers.

Surface Snow
Melting – MI

RS 485 GND
RS 485 RS 485+

vice P
er

A0
A1
A2
A3
A4
A5
A6
A7

Roof and Gutter
De-Icing

Product Overview

For additional information, contact your Pentair Thermal
Management representative or call (800) 545-6258.
Approvals
BACnet Testing Labs (BTL) B-ASC on ProtoNode-RER

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

protonode multi-protocol device server
Specifications
Electrical connections

ProtoNode-RER

ProtoNode-LER

• One 6-pin Phoenix connector, one
RS-485 +/- ground port, power +/frame ground port

• One 3-pin RS-485 Phoenix connector, one RS-485 +/- ground port

• One Ethernet-10/100 Ethernet port

• One FTT-10 LonWorks port

Power requirements

9–30 Vdc or Vac, or 5 Vdc

Current draw

150 mA @ 12 V

279 mA @ 12 V

Supported field protocols

• BACnet IP (Ethernet)
• BACnet MS/TP (RS-485)
• Metasys N2 open (RS-485)

LonWorks (serial FTT-10)

Operating temperature

–40°F to 187°F (–40°C to 85°C)

Relative humidity

5–90% RH, noncondensing

Enclosure dimensions

4.37 in L x 2.75 in W x 1.50 in H
(11.10 cm L x 7.00 cm W x 3.81 cm H)

Ordering Details
Description

Catalog number

Part number

Weight (lbs)

DigiTrace ProtoNode-RER:
BACnet MSTP/IP and Metasys N2
protocol gateway

ProtoNode-RER

P000001227

1.3

DigiTrace ProtoNode-LER:
LonWorks protocol gateway

ProtoNode-LER

P000001228

1.3

428

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THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection
and Flow Maintenance

Product overview

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating

Configurations
The RMM2 clips to a DIN 35 rail and can be mounted
in a choice of enclosures, as required for the area
classification and environment. For aggressive
environments and Division 2 hazardous locations, Pentair
Thermal Management offers a glass-reinforced polyester
NEMA 4X enclosure.

Freezer Frost
Heave Prevention

Alarms
Each temperature sensor connected to a RMM2 may have
individual low- and high-temperature alarms. Alarm limits
are set and alarm conditions are reported at the control
panel. Additional alarms are triggered for failed temperature
sensors and communication errors. Alarms may be reported
remotely through an alarm relay in the control system
or through an RS-485 connection to a host computer
supporting the Modbus® protocol.

Surface Snow
Melting – ElectroMelt

Control and monitoring
The RMM2 modules are used to aggregate RTD wires in one
remote location and send the information back to the control
system through a single twisted pair cable. This helps
reduce installation costs since only one conduit run returns
to the controller, rather than eight. The RMM2s are placed
near desired measurement locations in nonhazardous or
hazardous locations. Multiple temperature sensor inputs
are networked over a single cable, significantly reducing
installation cost.

Surface Snow
Melting – MI

The DigiTrace remote monitoring module (RMM2) provides
temperature monitoring capability for the NGC heat-tracing
control and monitoring systems. The RMM2 accepts
up to eight RTDs that measure pipe, vessel, or ambient
temperatures in a heat-tracing system. Multiple RMM2s
communicate with a single NGC controller to provide
centralized monitoring of temperatures. A single, twisted
pair RS-485 cable connects up to 16 RMM2s for a total
monitoring capacity of 128 temperatures.

Roof and Gutter
De-Icing

RMM2 without enclosure

Fire Sprinkler System
Freeze Protection

RMM2
heat-tracing remote monitoring module

rmm2
Dimensions
Figure 1
5 in
(125 mm)

2 3/8 in
(60 mm)

3 in
(75 mm)

General

RMM2

Area of use (with appropriate
enclosure)

Nonhazardous or hazardous locations

Approvals

Nonhazardous locations

80BJ ENERGY MANAGEMENT
EQUIPMENT SUBASSEMBLY
AND GENERAL SIGNALING
EQUIPMENT SUBASSEMBLY

Type NM

Ambient operating temperature range

–40°F to 140°F (–40°C to 60°C)

Ambient storage temperature range

–40°F to 140°F (–40°C to 60°C)

Relative humidity

5% to 95%, noncondensing

Supply voltage (nominal)

115/230 Vac, ±10%, jumper selectable. (The default voltage is 230 Vac. A jumper is
supplied to convert to 115 Vac.)

Internal power consumption

<3W

RMM2 with Division 2 Enclosure

RMM2-4X

Protection

Type 4X

Approvals

Hazardous locations
9Z63 TEMPERATURE
Class I, Division 2, Groups A, B, C, D
INDICATING EQUIPMENT Class II, Division 2, Groups F, G
FOR USE IN HAZARDOUS
LOCATIONS

Material

Glass-reinforced polyester, silicone gasket, stainless steel hardware

Entries

Six 3/4-in (19 mm) NPT conduit entrance holes, four plugged

Mounting

Surface mounting dimensions are shown in Figure 2

Temperature Sensor Inputs
Type

100 Ω platinum RTD, 3-wire, α =0.00385 Ω/Ω/°C

Quantity per RMM2

Up to 8
RTDs can be extended with a 3-conductor shielded cable of 20 Ω maximum per
conductor

Communication to NGC Controller
Type

RS-485

Cable

One shielded twisted pair

Length

4000 ft (1200 m) maximum

Quantity

Up to 16 RMM2s may be connected to one NGC-30

Address

Switch-selectable on RMM2, 16 addresses, 0–9, A-F

430

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THERMAL MANAGEMENT SOLUTIONS

Enclosure Dimensions
Figure 2

3.15 in
(80 mm)

0.26 in
(06.5 mm)

Fire Sprinkler System
Freeze Protection

10.24 in
(260 mm)
(cover not shown)

1.61 in
(41 mm)

4.33 in
(110 mm)

6.30 in
(160 mm)

9.45 in
(240 mm)

3.58 in
(91 mm)

Roof and Gutter
De-Icing

2.13 in (54 mm)

1.4 in (35.6 mm)
1.08 in
Division 2 enclosure (27.4 mm) 6 X
RMM2-4X

3 X 2.00 in
(50.8 mm)

24–12 AWG

RTD, communications

24–12 AWG

Surface Snow
Melting – MI

Connection Terminals
Power supply

Ordering Details
Catalog number

Pipe Freeze Protection
and Flow Maintenance

rmm2

Part number

Weight

Remote monitoring module (RMM2)
RMM2

051778-000

1.5 lb (0.7 kg)

RMM2-4X

523420-000

4 lb (1.8 kg)

Surface Snow
Melting – ElectroMelt

RMM2, eight RTD inputs, no enclosure
RMM2 with NEMA 4X enclosure
Cables
RTD extension cable, 1000-ft reel

MONI-RTD-WIRE

962661-000

20 lb (9.1 kg)

RS-485 cable, 1000-ft reel

MONI-RS485-WIRE

549097-000

17 lb (7.7 kg)

Freezer Frost
Heave Prevention
Floor Heating

EN-DigiTraceRMM2-DS-H56855

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

RTD-200
rtd temperature sensor for ambient sensing
Product Overview
The DigiTrace RTD-200 is a three-wire platinum RTD
(resistance temperature detector) typically used with
electronic control systems that require accurate ambient
temperature sensing. The RTD-200 comes with a 1/2" NPT
fitting that installs to the appropriate conduit box.
This allows mounting of the RTD in a typical ambient
location. This also allows for splicing of RTD extension wire
back to the controller.

Specifications
Sensor
Housing

316 stainless steel

Dimensions

3-in (7.6 mm) length, 1/4-in (6 mm) diameter

Accuracy

± 0.3°F (± 0.2°C)

Range

–100°F to 300°F (–73°C to 149°C)

Resistance

100 ohms ± 0.25 ohm at 0°C α=0.00385 ohms/ohm/°C

Extension wire
Wire size (each of three)

22 AWG
Note: The length of RTD extension wires is determined by the wire gauge used. To
reduce the likelihood that electrical noise will affect temperature measurement,
keep RTD extension wires as short as possible. Use shielded instrument cable
such as DigiTrace MONI-RTD-WIRE (22 AWG, PVC insulation, –30°F to 140°F,
–20°C to 60°C) or Belden 83553(22 AWG, FEP insulation, –95°F to 395°F, –70°C to 200°C).

Wire dielectric strength

600 V

Length

6 ft (1.8 m)

Outer jacket

Fluoropolymer

Maximum exposure temperature

300°F (149°C)

Sensor fitting

1/2-in (12.7 mm) NPT with sealing washer and nut

Approvals

.
Approvals associated with control device. Not to be used in Division 1 areas.

432

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THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection
and Flow Maintenance
Fire Sprinkler System
Freeze Protection

RTD3CS, RTD10CS, and RTD50CS
rtd temperature sensors
For temperature measurement up to 400°F (204°C)

The DigiTrace RTD3CS, RTD10CS and RTD50CS are threewire platinum RTD (resistance temperature detectors)
typically used with monitoring and control systems such as
the DigiTrace 910 controller when accurate temperature
control is required.

Specifications
Sensor
316 stainless steel

Dimensions

3-in (76 mm) length 3/16-in (8 mm) diameter

Sensing area

1-1/2 in (38 mm)

Accuracy

±1°F (0.5°C) at 32°F (0°C)

Range

–76°F to 400°F (–60°C to 204°C)

Resistance

100 ohms at 0°C α =0.00385 ohms/ohm/°C

Extension wires

Wire insulation rating

300 V

Length

RTD3CS: 3-ft (0.3 m) flexible armor, 18-in (457 mm) lead wire
RTD10CS: 10-ft (3 m) flexible armor, 18-in (457 mm) lead wire
RTD50CS: 50-ft (15.2 m) flexible armor, 18-in (457 mm) lead wire

Outer shield

Stainless steel flexible armor (not suitable for underground applications)

Maximum exposure temperature

400°F (204°C)

Conduit bushing

1/2-in (12.7 mm) NPT

Additional materials required

AT-180 aluminum tape

Floor Heating

20 AWG, stranded tinned copper
Note: The length of RTD extension wires is determined by the wire gauge used. To
reduce the likelihood that electrical noise will affect temperature measurement,
keep RTD extension wires as short as possible. Use shielded instrument cable
such as DigiTrace MONI-RTD-WIRE (22 AWG, PVC insulation, –30°F to 140°F,
–20°C to 60°C) or Belden 83553 (22 AWG, FEP insulation, –95°F to 395°F, –70°C to 200°C).

Freezer Frost
Heave Prevention

Wire size (each of three)

Surface Snow
Melting – ElectroMelt

Housing

Surface Snow
Melting – MI

The RTD3CS, RTD10CS and RTD50CS can be installed
directly to the controller using the supplied 1/2" conduit
fitting or to an RTD junction box where RTD extension wire is
used.

Roof and Gutter
De-Icing

Product Overview

Approvals
Approvals associated with control device. Not to be used in Division 1 areas.

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

RTD4AL
rtd temperature sensor
For temperature measurement up to 900°F (482°C)
Product Overview
The DigiTrace RTD4AL is a three-wire platinum RTD
(resistance-temperature detector) typically used with
monitoring and control systems that require accurate
temperature control. The RTD4AL kit can be used with a
wide variety of DigiTrace monitoring and control systems.
Specifications

3/4-in NPT
(19 mm)
conduit
opening

Sensor housing

Aluminum; NEMA 4X

Sensor sheath

316 stainless steel

Range

–100°F to 900°F (–73°C to 482°C)
maximum

Accuracy

±1°F (0.5°C) at 32°F (0°C)

Resistance

100 ohms at 0°C α =0.00385 ohms/
ohm/°C

Connection

3/4-in (19 mm) NPT conduit hub
Note: The length of RTD extension
wires is determined by the
wire gauge used. To reduce the
likelihood that electrical noise will
affect temperature measurement,
keep RTD extension wires as
short as possible. Use shielded
instrument cable such as DigiTrace
MONI-RTD-WIRE (22 AWG, PVC
insulation, –30°F to 140°F, –20°C to
60°C) or Belden 83553 (22 AWG, FEP
insulation, –95°F to 395°F, –70°C to
200°C).

4.25 in
(108 mm)

2 in (51 mm)
3 in (76 mm)

Additional Materials Required
Pipe strap, conduit, 16–22 AWG
shielded instrument cable
Kit Contents
One RTD temperature sensor
Approvals
The RTD4AL is CSA certified to U.S. and Canadian standards.
Class I, Div. 2, Groups A, B, C, D
Class II, Div. 2, Groups F, G

434

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11/13

THERMAL MANAGEMENT SOLUTIONS

Pipe Freeze Protection
and Flow Maintenance
Fire Sprinkler System
Freeze Protection

RayClic
Connection Kits and Accessories
For XL-Trace, IceStop and HWAT self-regulating heating cables

The Raychem RayClic connection system is a simple, fast
and reliable set of connection kits developed for select
XL-Trace, IceStop and HWAT self-regulating heating cables.
There is no wire stripping needed because the insulation
displacement connector makes the electrical connection.

The easy-to-install RayClic connection system reduces
installation time, lowering the total installed cost of the
heating cable system.

Roof and Gutter
De-Icing

Product Overview

Simple
• No need for special tools
• Three-step installation
Reliable
• Intuitive installation
• Rugged, waterproof, UV-resistant enclosure

Surface Snow
Melting – MI

Cost-effective
• Quick installation
Powered Connection Kits
Description

RayClic-PC

233053-000

A RayClic-PC can supply power to one heating cable. Each kit contains one
RayClic-PC power connection, one RayClic-E end seal, and one SB-04 pipe
mounting bracket. The kit includes 5' power lead wires and a conduit fitting; the
junction box and flexible conduit required to make a complete connection are not
included.
Weight: 1.8 lb (0.8 kg)

RayClic-PS

861247-000

A RayClic-PS can be used as a power connection kit for supplying power to two
heating cables. Each kit contains one RayClic-PS powered splice connection,
two RayClic-E end seals, and one SB-04 pipe mounting bracket. The kit includes
5' power lead wires and a conduit fitting. The junction box and flexible conduit
required to make a complete connection are not included.
Weight: 2.0 lb (0.9 kg)

RayClic-PT

804231-000

A RayClic-PT can be used as a power connection kit for supplying power to three
heating cables. Each kit contains one RayClic-PT powered tee connection, three
RayClic-E end seals, and one SB-04 pipe mounting bracket. The kit includes
5' power lead wires and a conduit fitting. The junction box and flexible conduit
required to make a complete connection are not included.
Weight: 2.0 lb (0.9 kg)

Part number

Description

RayClic-S

559871-000

Splice kits are installed as needed to connect two heating cables together at one
point. Each kit contains one RayClic-S splice.
Weight: 1.3 lb (0.6 kg)

lic

R yC
Ra

Catalog number

Floor Heating

Unpowered Connection Kits

Freezer Frost
Heave Prevention

Part number

Surface Snow
Melting – ElectroMelt

Catalog number

3A,
3B,
3C,

HAZA gized
ener

: SHOCwhile

1 /8

DESIG.

NING open
WAR not
Do

LISTED

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Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

rayclic connection kits and accessories
Unpowered Connection Kits
Catalog number

Part number

Description

RayClic-T

014023-000

Tee kits are installed as needed to connect three heating cables together at one
point. Each kit contains one RayClic-T tee connection and one RayClic-E end seal.
Weight: 1.9 lb (0.9 kg)

RayClic-X

RayClic-X kits are installed as needed to connect four heating cables together at
one point. Each kit contains one RayClic-X cross and two RayClic-E end seals.
Weight: 2.0 lb (0.9 kg)

P000000770

Lighted end seal kits are installed wherever an end-of-line signal light is
required. Each kit contains one RayClic-LE lighted end seal and one RayClicSB-04 pipe mounting bracket.
Weight: 1.8 lb (0.8 kg)

546349-000

RayClic-LE

Accessories
Catalog number

Part number

Description

RayClic-E

805979-000

The RayClic-E is a replacement end seal kit.

RayClic-SB-02

852001-000

The RayClic-SB-02 is a wall mounting bracket for use with any RayClic connection
kit.

RayClic-SB-04

616809-000

The RayClic-SB-04 is a pipe mounting bracket for use with any RayClic connection
kit. One pipe mounting bracket is included with each powered connection kit and
the RayClic-LE lighted end seal kit.

RayClic System Specifications
Rated voltage

120–277 V

Maximum circuit breaker size

30 A

Maximum exposure temperature

150°F (65°C)

Minimum installation temperature

0°F (–18°C)

Enclosure rating

NEMA 4X

Applicable Products

436

XL-Trace

5/8XL1-CR/CT and 5/8/12XL2-CR/CT

IceStop

GM-1XT, GM-1X, GM-2XT and GM-2X

HWAT

HWAT-R2, HWAT-P1

EN-RaychemRayClicConnectionKits-DS-H57545

11/13

THERMAL MANAGEMENT SOLUTIONS

Approvals
718K Pipe Heating Cable
877Z De-Icing and Snow Melting

Pipe Freeze Protection
and Flow Maintenance

rayclic connection kits and accessories

Fire Sprinkler System
Freeze Protection

With XL-Trace and IceStop
heating cable only
For Class I, Div. 2,
Groups A,B,C,D
hazardous locations- GM-1XT
and GM-2XT only

Design and Installation

Ground-Fault Protection

Surface Snow
Melting – MI

To minimize the danger of fire from sustained electrical arcing if the heating
cable is damaged or improperly installed, and to comply with the requirements
of Pentair Thermal Controls, agency certifications, and national electrical codes,
ground-fault equipment protection must be used on each heating cable branch
circuit. Arcing may not be stopped by conventional circuit protection. Many
DigiTrace control and monitoring systems meet the ground-fault protection
requirement.

Roof and Gutter
De-Icing

For proper design and installation of a RayClic connection system, use the
appropriate product design guide and the installation instructions included with
the connection kit.

Surface Snow
Melting – ElectroMelt
Freezer Frost
Heave Prevention
Floor Heating

EN-RaychemRayClicConnectionKits-DS-H57545

11/13

437

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

FTC
Heat Shrinkable Connection Kits
For XL-Trace, IceStop and RaySol self-regulating heating cables
Product Overview
The Raychem FTC heat shrinkable connection kits are used
with XL-Trace, IceStop and RaySol self-regulating heating
cables.
The FTC connection kits are designed to provide low cost
power connection and low profile splice and tee kits.
The FTC power connection kits can be used for circuit
breakers rated up to 40 A.
Powered Connection Kits
Catalog number

Part number

Description

FTC-P

111711-000

Power connection kit with end seal:
The FTC-P power connection and end seal kit is for use with XL-Trace, RaySol
and IceStop heating cables. Materials for one power connection and end seal is
included in the kit.

FTC-XC

368979-000

Power connection kit with end seal:
The FTC-XC power connection and end seal kit is for use with XL-Trace and RaySol
heating cables that are run through conduit to a junction box. Materials for one
power connection and end seal is included in the kit.

FTC-HST

354169-000

Splice or Tee kit:
The FTC-HST splice or tee kit is for use with XL-Trace, RaySol and IceStop heating
cables. Material for two splice or tees included in each kit.

FTC-PSK

P000000927

Pipe stand and power connection kit:
The FTC-PSK pipe stand and power connection kit is for use with XL-Trace heating
cables. The stand is designed specifically for the DigiTrace ECW-GF electronic
controllers and is compatible with other junction boxes that have 1 inch NPT
entries, threaded or non-threaded. Materials for one power connection and end
seal is included in the kit.

XLTrace

438

RaySol
IceStop

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THERMAL MANAGEMENT SOLUTIONS

Specifications
120–277 V

Maximum circuit breaker size

40 A

Maximum exposure temperature

150°F (65°C)

Minimum installation temperature

0°F (–18°C)

Enclosure rating

NEMA 4X

XL-Trace

5/8XL1-CR/CT and 5/8/12XL2-CR/CT

IceStop

GM-1XT, GM-1X, GM-2XT and GM-2X

RaySol

RaySol-1 and RaySol-2

Applicable Products

Roof and Gutter
De-Icing

Approvals
Certified with IceStop and
RaySol heating cables

With XL-Trace and IceStop heating cables

For XL-Trace heating cables

Surface Snow
Melting – MI

APPROVED

718K Pipe Heating Cable or
877Z De-Icing and Snow Melting
Equipment or 9J8 6 Radiant
Heating Cable

Fire Sprinkler System
Freeze Protection

Rated voltage

Pipe Freeze Protection
and Flow Maintenance

ftc heat shrinkable connection kits

Hazardous locations:
Class I, Div 2. Groups A, B, C, D
GM-1XT and GM-2XT only

Design and Installation
For proper design and installation of a FTC connection kit, use the appropriate
product design guide and the installation instructions included with the
connection kit.
Surface Snow
Melting – ElectroMelt

Freezer Frost
Heave Prevention
Floor Heating

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439

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

ElectroMelt
Connection Kits and Accessories

Connection Kits
Catalog number

Part number

Description

EMK-XP

579519

The power connection and end seal kit is a water-resistant
electrical assembly that is sealed with a proprietary adhesive and
protected by a crosslinked, modified polyolefin heat-shrinkable
tube.

6 in
15.25 cm

Storage temperature: –40°F to 140°F (–40°C to 60°C)
Minimum installation temperature: 0°F (–18°C)
Power connection wire range: 14 to 4 AWG
Voltage rating: 600 V
Packaging: One power connection and one end seal per box
Shipping weight: 0.4 lb (182 g)

Power connection EMK-XP
6 in
15.25 cm

End seal EMK-XP

356667

EMK-XS
10 in
25.4 cm

The splice kit is a water-resistant electrical assembly that is
sealed with a proprietary adhesive and protected by a crosslinked,
modified polyolefin heat-shrinkable tube.
Storage temperature: –40°F to 140°F (–40°C to 60°C)
Minimum installation temperature: 0°F (–18°C)
Voltage rating: 600 V
Packaging: One splice kit per box
Shipping weight: 0.2 lb (91 g)

Accessories
Catalog number

Part number

Description

EMK-XJR

693647

The jacket repair kit is a heat-shrinkable wrap-around sleeve for
covering a damaged outer jacket. The repair sleeve is adhesivelined and comes with a removable metal closure.

12 in
30.5 cm

Metal
closure

EMK-CT

Nominal length: 12 in (30.5 cm)
Packaging: One repair sleeve per kit
Shipping weight: 0.8 lb (365 g)

ShrinkWrapTM
sleeve

906441

The nylon cable ties are seven-inch nylon industrial cable ties.
Manufacturer: Panduit
Model number: PLT2S-C
Length: 7-3/8" ± 1/2" (18.74 cm ± 1.25 cm)
Width: 3/16" (0.48 cm)
Packaging: 100 per pack
Shipping weight: 0.5 lb (227 g)

440

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THERMAL MANAGEMENT SOLUTIONS

Accessories
Part number

Description

EMK-XT

980631

The crimping tool is the correct size for the crimps in the
connection kit.

Fire Sprinkler System
Freeze Protection

Catalog number

Manufacturer: Ideal
Model number: 30-425
Length: 10" (25.4 cm)
Packaging: One per kit
Shipping weight: 1.2 lbs (545 g)

472207
3 in
6in
7.6 cm 15.25 cm

9 in
22.8 cm

The expansion joint kit provides physical protection for the heating
cable beneath slab joints. An expansion tube is used to form an
expansion loop for the heating cable.
Storage temperature: –40°F to 140°F (–40°C to 60°C)
Minimum installation temperature: 0°F (–18°C)
Packaging: One expansion joint per kit
Shipping weight: 0.3 lb (140 g)

3 in radius

Surface Snow
Melting – MI

EMK-XEJ

Roof and Gutter
De-Icing

Snow melt caution sign
Dimensions 6 x 4 in (150 x 100 mm)

SMCS

Pipe Freeze Protection
and Flow Maintenance

electromelt connection kits and accessories

2 in (5.1 cm)

052577

EMK-XJB

10.5 in
8 in
11.75 in

The junction box is a large, UL Listed weatherproof enclosure
suitable for terminating both ends of an ElectroMelt heating
cable circuit. This junction box is large enough for 2 circuits of
ElectroMelt heating cables. The enclosure is made of molded
structural foam and provides high impact strength, excellent
chemical resistance, high dielectric strength, and excellent
weathering capabilities.

0.31 in

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441

Technical Data
Sheets

THERMAL MANAGEMENT SOLUTIONS

Floor Heating

6.88 in

6.44 in

15 in

12.5 in

Manufacturer: Carlon, model CJ12106
Inside dimensions: 12" x 10" x 6-7/8" (30.5 cm x 25.4 cm x 17.5 cm)
Inside volume: 825 cubic inches (13528 cm3)
Outside dimensions: 15-1/2" x 11-3/4" x 7-5/8"

(39.4 cm x 29.85 cm x 19.37 cm)
Temperature range: –40°F to 185°F (–40°C to 85°C)
UL Standard: UL508
NEMA rating: Types 1, 3, 3S, 3X, 3SX, 4, 4X, 12, 13 as indicated
Packaging: One junction box per kit
Shipping weight: 5.4 lbs (2.45 kg)

Freezer Frost
Heave Prevention

11.75 in

Surface Snow
Melting – ElectroMelt

Sand fill

electromelt connection kits and accessories
Accessories
Catalog number

Part number

Description

FH-2616A-1

102049

The propane torch is suitable for heat shrinking the connection
kits. It includes a hose, a handle assembly, and comes equipped
with a regulating valve.
Packaging: One per kit
Shipping weight: 5 lbs (2.27 kg)

Approvals
877Z De-icing and
Snow-melting
Equipment
(for EM2-XR only)

-w

The EM2-XR and EM3-XR heating cables are UL Listed and CSA Certified only
when used with the appropriate agency-approved Pentair Thermal
Management connection kits and accessories.

Design and Installation
For proper design and installation of an Electromelt connection kit, use the
appropriate product design guide and the installation instructions included with
the connection kit.
Ground-Fault Protection
To minimize the danger of fire from sustained electrical arcing if the heating
cable is damaged or improperly installed, and to comply with the requirements
of Pentair Thermal Management, agency certifications, and national electrical
codes, ground-fault equipment protection must be used on each heating cable
branch circuit. Arcing may not be stopped by conventional circuit protection.
Many DigiTrace control and monitoring systems meet the ground-fault protection
requirement.

442

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THERMAL MANAGEMENT SOLUTIONS

WWW.PENTAIRTHERMAL.COM

NORTH AMERICA

EUROPE, MIDDLE EAST, AFRICA

ASIA PACIFIC

LATIN AMERICA

Tel: +1.800.545.6258
Fax: +1.800.527.5703
Tel: +1.650.216.1526
Fax: +1.650.474.7711
thermal.info@pentair.com

Tel: +32.16.213.511
Fax: +32.16.213.603
thermal.info@pentair.com

Tel: +86.21.2412.1688
Fax: +86.21.5426.2917
cn.thermal.info@pentair.com

Tel: +1.713.868.4800
Fax: +1.713.868.2333
thermal.info@pentair.com

Pentair, 920, AMC-1A, AMC-1B, AMC-F5, C910-485, DigiTrace, ECW-GF, ElectroMelt, HotCap, HTPG, HWAT, IceStop, Pyrotenax, RayClic, RaySol,
RTD-200, RTD3CS, RTD4AL, RTD10CS, QuickNet, QuickStat, SnoCalc, XL-ERATE and XL-Trace are owned by Pentair or its global affiliates. All other
trademarks are the property of their respective owners. Pentair reserves the right to change specifications without prior notice.
© 2007-2013 Pentair.

THERMAL MANAGEMENT SOLUTIONS

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