Trane Round In Out Catalogue VAV PRC012 EN (072013)

Trane-Fan-Powered-Low-Height-Series-Catalogue-684365 trane-fan-powered-low-height-series-catalogue-684365

Trane-Fan-Powered-Series-Terminal-Catalogue-684343 trane-fan-powered-series-terminal-catalogue-684343

Trane-Fan-Powered-Parallel-Terminal-Catalogue-684354 trane-fan-powered-parallel-terminal-catalogue-684354

Trane-Fan-Powered-Low-Height-Parallel-Catalogue-684376 trane-fan-powered-low-height-parallel-catalogue-684376

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Product Catalog

VariTrane™ Products
Parallel and Series Fan-Powered
VPCF, VPWF, VPEF, VSCF, VSWF, VSEF,
LPCF, LPWF, LPEF, LSCF, LSWF, LSEF
Variable-Air-Volume (VAV) System
RA

EA

OA

supply
fan

PA
VAV
box

cooling
coil
variablespeed drive
thermostat

SA

July 2013

VAV-PRC012-EN

Introduction
Fan-powered units offer energy savings due to intermittent fan control.The fan energizes only in
heating mode when the space needs heat. Additional energy savings are obtained by using warm
plenum air for free reheat. Motor heat is never wasted in parallel units.They are an excellent choice
when minimal zone heating is needed.
Figure 1. Parallel fan-powered terminal unit (L) & series fan-powered terminal units (R)

Figure 2. Low height series: LSCF (L) & low height series: LSWF (R)

Figure 3. Low height series: LSEF (L) & low height parallel: LPCF (R)

Figure 4. Low height parallel: LPWF (L) & low height parallel: LPEF (R)

Revision Summary
VAV-PRC012-EN (16 Jul 2013). Updated proportional water valve design.
VAV-PRC012-EN (27 June 2013). Updated controls information. Updated dimensions for units
with attenuators.

Trademarks
Earthwise, VariTrane, VariTrac,Trane and theTrane logo are trademarks ofTrane in the United
States and other countries. All trademarks referenced in this document are the trademarks of their
respective owners.
BACnet is a registered trademark of American Society of Heating, Refrigerating and AirConditioning Engineers (ASHRAE); LONMARK and LonTalk are registered trademarks of Echelon
Corporation.

© 2013Trane All rights reserved

VAV-PRC012-EN

Table of Contents
Features and Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Agency Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Model Number Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Selection Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Parallel Fan-Powered Terminal Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Series Fan-Powered Terminal Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Low Height Parallel Fan-Powered Terminal Units . . . . . . . . . . . . . . . . . . . . 47
Low Height Series Fan-Powered Terminal Units . . . . . . . . . . . . . . . . . . . . . 53

Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Parallel Fan-Powered Terminal Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Series Fan-Powered Terminal Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Low Height Parallel Fan-Powered Terminal Units . . . . . . . . . . . . . . . . . . . . 68
Low Height Series Fan-Powered Terminal Units . . . . . . . . . . . . . . . . . . . . . 70

Acoustics Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Parallel Fan-Powered Terminal Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Series Fan-Powered Terminal Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Low Height Parallel Fan-Powered Terminal Units . . . . . . . . . . . . . . . . . . . . 92
Low Height Series Fan-Powered Terminal Units . . . . . . . . . . . . . . . . . . . . . 98

Dimensional Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Parallel Fan-Powered Terminal Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Series Fan-Powered Terminal Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Low Height Parallel Fan-Powered Terminal Units . . . . . . . . . . . . . . . . . . . 123
Low Height Series Fan-Powered Terminal Units . . . . . . . . . . . . . . . . . . . . 134

Mechanical Specifications: Fan-Powered . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
DDC Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
Control Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
DDC Remote Heat Control Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
Tracer™ UC400 and UC210 Programmable BACnet Controllers . . . . . . . 152
Trane DDC VAV Controller Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
Flow Tracking Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Tracer™ Programmable BACnet Controller — Unit Control Module . . . . 158
Trane LonMark DDC VAV Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Trane DDC VAV Controller Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
VAV-PRC012-EN

3

Flow Tracking Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
LonMark™ Direct Digital Controller—Unit Control Module . . . . . . . . . . . 166
Direct Digital Controller—Unit Control Module . . . . . . . . . . . . . . . . . . . . . 169
Wireless Comm Interface (WCI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
Wireless Receiver/Wireless Zone Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . 172
DDC Zone Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
CO2 Wall Sensor and Duct CO2 Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
DDC Zone Sensor with LCD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
Zone Occupancy Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
Factory or Field Wired Auxiliary Temperature Sensor . . . . . . . . . . . . . . . 178
Control Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
Two-Position Water Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179
Proportional Water Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
Differential Pressure Transducer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
Transformers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182
Trane Actuator – 90 Second at 60 Hz Drive Time . . . . . . . . . . . . . . . . . . . . 183
Belimo Actuator – 95 Second Drive Time . . . . . . . . . . . . . . . . . . . . . . . . . . 184
Trane Spring Return Actuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
VariTrane DDC Retrofit Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186
Retrofit Kit Actuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186
Silicon-Controlled Rectifier (SCR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187
Pneumatic Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188
Controls Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203

Application Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
VAV System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
Parallel vs. Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
Low-Temperature Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
Energy Savings & System Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
Control Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218
Flow Measurement and Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221
Reheat Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224
Insulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226
Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226
Duct Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
Best Practices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231
Unit Conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232
Additional VAV System and Product References . . . . . . . . . . . . . . . . . . . . 233
4

VAV-PRC012-EN

Features and Benefits
VariTrane™– VAV Leadership
VariTrane variable-air-volume (VAV) units lead the industry in quality and reliability and are
designed to meet the specific needs of today’s applications.This generation of VariTrane units
builds upon the history of quality and reliability and expands the products into the most complete
VAV offering in the industry.
Parallel Fan-powered units offer energy savings due to intermittent fan control.The fan
energizes only in heating mode when the space needs heat. Additional energy savings are obtained
by using warm plenum air for free reheat. Motor heat is never wasted in parallel units.They are
an excellent choice when minimal zone heating is needed.
Series fan-powered units have fans which are always energized in occupied mode.They are
common in applications such as conference rooms, cafeterias, etc., that desire constant airflow
rates at all conditions.
Low-height parallel units provide the energy savings of an intermittent fan with the flexibility
of an 11"–11.5” casing height.This is a good choice for tight plenum spaces.
Low-height series units have been used for years in projects with strict plenum height
requirements. Units
are available in 11.0" height.

Energy Efficient Earthwise™ Systems
Figure 5. Rooftop VAV (office building)

A significant consumer of energy in commercial buildings is heating and air conditioning. One of
the most energy-efficient HVAC solutions is the VAV system.This inherent system efficiency, along
with high-quality, affordable DDC controls, has steadily increased demand for VAV systems over
the years. VAV systems save significant energy, are able to deliver the required amount of
ventilation air, and provide reliable occupant comfort.
Energy saving features must go beyond a simpleVAV unit to incorporateVAV unit level and system
level control strategies like:
•

VAV-PRC012-EN

Ventilation Optimization-Combines demand-controlled ventilation (using either a time-of-day
schedule, an occupancy sensor, or a carbon dioxide sensor) at the zone level with ventilation
reset at the system level to deliver the required amount of outdoor air to each zone, while
minimizing costly over-ventilation.
5

Features and Benefits

•

Fan Pressure Optimization- reduces supply fan energy by as much as 40% by intelligently
reducing the pressure in the air distribution system to the lowest possible level without
impacting occupant comfort.

•

Night setback reduces energy consumption during unoccupied periods by raising or lowering
space temperature setpoints.

•

Supply AirTemperature Reset-reduces overall system energy use (balancing reduced cooling
and reheat energy with increased fan energy) by raising the supply air temperature at part load,
while avoiding elevated space humidity levels.

•

Electrically Commutated Motors (ECM) improve the efficiency of fan-powered VAV units.

•

LowTemperature Air Distribution can decrease overall system energy use by reducing airflows
and the fan energy needed to move that air through the system.

To determine the potential energy savings a VAV system can bring to your applications,Trane
offers energy-modeling software like System Analyzer™ andTRACE 700®. WhenTRACE™ was
introduced into the HVAC industry in 1972, the HVAC design and analysis program was the first of
its kind and quickly became a defacto industry standard. It continues to grow with the industry
meeting requirements for ASHRAE Standard 140, ASHRAE 90.1, and the LEED® Green Building
Rating System and has now been approved by the IRS to certify energy savings for building
owners. Contact your localTrane Sales Engineer for additional information.

Control Flexibility—Trane
factory installs more VAV
controllers than any other
manufacturer in the
industry. In addition to
Trane DDC controls and
simple factory-mounting
of non-Trane VAV controllers,
Trane now offers a LonMark™
controller that is completely
factory-commissioned to
maximize installation quality
and system reliability. Labor
savings are maximized with
Trane factory-commissioned
controllers.

Accurate Flow Ring—Housed
and recessed within the air
valve to provide flow ring
handling/shipping protection.
The patented flow ring provides
unmatched airflow measurement
accuracy.

Rugged Air Valve—Trane air
valves are heavy gage steel
with a continuously welded
seam to limit inlet deformation.
This provides consistent and
repeatable airflow across
the flow ring with performance you
can count on.

Technologically Advanced "S
Units— New super-quiet (SQ
fan/motor/wheel assemblies
engineered as an air deliver
system to provide the most
efficient design available in
industry. For quiet comfort y
can trust, rely on Trane SQ u

Service Friendly:
* Internal shaft visible
through control box
Tough Interlocking Panels— Rug
cover sight hole for
and rigidity are assured with Tra
blade orientation
patent-pending interlocking pan
verification.
* Same-side NEC jumpback clearance—
provides all high- and low-voltage
components on the same side
to minimize field labor.
Superior Metal Encapsulated
* SQ fan-powered units have
VariTrane Units are complete
improved accessability to
encapsulated edges to arrest
internal components. Sliding
fibers and prevent erosion in
panels are standard which
improve safety and allow Optional Narrow Corridor unit
servicing with a single
configuration — designed to minimize building
Full Range of Insulation—Whether seeking optimal acoustical perf
technician.
material expenses by squeezing more into less space.
or cleanability, Trane has a complete line of insulation options, incl
Meets all NEC jumpback clearance requirements
double-wall, matte-faced, foil-faced, closed cell, etc.
for these extra-tight areas. Narrow Corridor
Configuration not pictured here. Refer to Series
Fan-Powered dimensional data for reference drawings.

6

VAV-PRC012-EN

Features and Benefits

Construction
UL-listed products—
Safety and reliability are vital in commercial construction. All VariTrane units are completely listed
in accordance with UL -1995 as terminal units.This listing includes the VAV terminal with electric
heaters. Additionally, all insulation materials pass UL 25/50 smoke and flame safety standards.

AHRI Certified Performance—
All VariTrane units are AHRI certified. AHRI 880 guarantees the pressure drop, flow performance,
and acoustical performance provided is reliable and has been tested in accordance with industry
accepted standards. AHRI 885 uses AHRI 880 performance and applies accepted industry methods
to estimate expected “NC” sound levels within the occupied space.

Casing Design—
Interlocking Panels—VariTrane products are manufactured in the most state-of-the-art VAV facility
in the world.The patent-pending interlocking panels are designed using integral I-beam
construction technology.This limits deformation and creates tremendous product rigidity. An
additional benefit is a smooth unit exterior with few exposed screws—ideal for exposed ceiling
applications. VariTrane units are designed for use in systems that operate up to 5" w.c. of inlet
pressure.
Metal Encapsulated Edges—AllVariTrane units are complete
with encapsulated edges to arrest cut fibers and prevent
insulation erosion into the airstream.This is the standard of
care in applications concerned with fiberglass erosion or
projects with either double-wall or externally wrapped duct
work.

TheTrane Air Valve—is at the heart of VariTrane terminal
units.This is where airflow is measured and controlled.
Repeatability and ruggedness is vital.VariTrane products are
the most rugged and reliable available.

18-gage Cylinder—limits deformation or damage during shipment and job site handling, and
provides even airflow distribution across the flow ring for unmatched airflow measurement
accuracy.
Continuously Welded Seam — an automated weld process creates the highest quality continuous
seam, which is “right” every time.The welded seam improves air valve rigidity and creates
consistent and repeatable airflow across the flow measurement device.The result is a truly round
cylinder every time, with no flat spots caused by lower quality crimping and riviting technologies.
Flow Ring—TheTrane flow ring is time tested to perform under the
most demanding conditions. Additionally,Trane’s patented flow ring
is recessed within the air valve cylinder to reduce the potential for
damage during job site handling and installation.

VAV-PRC012-EN

7

Features and Benefits

External Shaft—The simple design provides controller flexibility and is designed to facilitate
actuator field replacement.
Position Indicator—The position indicator shows current air valve position to aid in system
commissioning. Many times this can be seen from the floor without climbing a ladder.
External Actuator—This feature increases serviceability, control system compatibility, and actuator
clutch access for simplified commissioning.

Indoor Air Quality (IAQ) Features
The oil embargo of the early 1970s created an energy crisis, which resulted in tighter buildings, and
reduced ventilation rates. A fallout issue of tighter building construction was poor indoor air
quality.This heightened IAQ awareness. IAQ issues have been featured in publications from the
smallest towns to the largest cities. System design should consider applicable ventilation and IAQ
standards.(See your localTrane Sales Engineer or visit www.trane.com for additional information).
Good indoor air quality results from units and systems which:
•

Provide the required amount of ventilation air to each zone during all operating conditions

•

Limit particulates from entering occupied spaces

•

Allow proper access for periodic cleaning.

Note: Access made easy on new VariTrane units, as shown on this Series Fan-Powered unit.

VariTrane units are designed with simplified access and a full line of insulation options including:
Matte-faced—Typical industry standard with reduced first cost.
Closed-cell—This insulation has an R-value and performance equivalent to matte-faced insulation.
The main difference is the reduction of water vapor transmission. Closed-cell is designed for use
in installations with a high chance of water formation. (It has been used to coat the exterior of chiller
evaporator barrels for many years.)
Foil-faced—A fiberglass insulation with a thin aluminum coating on the air stream side to prevent
fibers from becoming airborne.The aluminum lining is acceptable for many applications, however
it is not as rugged as double-wall
Double-wall—Premium insulation often used in many health care applications with insulation
locked between metal liners.This eliminates the possibility for insulation entering the airstream
and allows for unit interior wipe-down as needed.
VariTrane VAV units are the most prepared IAQ units in the industry.
The end result is a reliable product designed for peak performance, regardless of job site conditions
or handling.

8

VAV-PRC012-EN

Features and Benefits

Tracer™ Building Automation System
Tracer Building Automation System assures comfort within your building. Building controls have
a bigger job description than they did a few years ago. It’s no longer enough to control heating and
cooling systems and equipment. Sophisticated buildings require smarter technology that will
carry into the future. Tracer™ controls provide the technology platform – mobile, easy-to-use,
cloud-based, scalable and open - for the next generation of data-driven, technology-enabled
services that are creating high performance buildings. With aTraneTracer Building Automation
System, you’ll:
•

Reduce operating costs through energy management strategies

•

Consistently provide occupant comfort

•

Enjoy reliable operation with standard, pre-engineered and pretested applications

•

Easily troubleshoot and monitor either on site or from a remote location

•

Reduce installation time and simplify troubleshooting

Whether factory-mounted or field-installed,Trane offers a wide range of controllers to suit virtually
any application.These units are compatible with a variety of building types and can be used for new
construction or renovation.Through extensive usability testing internally and with building
operators, we’ve designed our controls for real world ease of use.
(Additional control options and sequence-of-operations are located in the “Controls” section.)
Trane VAV UCM DDC Controller
DDC (communicating electronic)—DDC
controllers are today’s industry standard. DDC
controllers provide system-level data used to
optimize overall SYSTEM performance.
Variables such as occupied/unoccupied,
minimum and maximum cfm and
temperature, valve position, ventilation
fraction, etc. are available on a simple twistedshielded wire pair. For additional information,
see “Industry Issues: Energy Efficiency”.
Note: One of many Trane DDC Control Options which are factory-installed, wired, calibrated, and fully tested before shipment.

Trane DDC controllers provideTrane-designed solid-state electronics intended specifically for VAV
temperature control in space comfort applications. DDC control capabilities include:
•

Pressure-independent (PI) operation—Provides airflow required by the room thermostat to
maintain occupant comfort.The controller automatically adjusts valve position to maintain
required airflow. Minimum and maximum airflow is factory-set and field-adjustable.

•

Factory-set airflow and temperature setpoints

•

Most advanced system integration in the industry.

Tracer VV550 LonTalk™ Controllers
LonTalk™ Controller
Trane now offers a full line of LonTalk™
controllers designed for simple integration
into ANY system which can communicate via
the LonMark Space Comfort Control (SCC)
protocol.These controllers are also
completely factory-commissioned.

VAV-PRC012-EN

9

Features and Benefits

Tracer BACnet™ Controllers
Trane now offers a full line of BACnet controllers designed for simple integration into any system
which can communicate via the BACnet protocol.These controllers are factory-commissioned and
shipped ready to be installed.

UC210 BACnet Controller

UC400 BACnet Controller

Trane Wireless Comm Interface (WCI)
WCI controller
Provides wireless communication between theTracer SC,
Tracer Unit Controllers, and BACnet™ Communication
Interface (BCI) modules.
TheTrane WCI is the perfect alternative toTrane’s BACnet
wired communication links (for example – Comm links
between aTracer SC andTracer UC400).
Eliminating communication wire used between terminal
products, zone sensors, and system controllers has substantial
benefits.
•

Installation time and associated risks are reduced.

•

Projects are completed with fewer disruptions.

•

Future re-configurations, expansions, and upgrades are
easier and more cost effective.

Trane Wireless Zone Sensor
Wireless Zone Sensor
Provides wireless communication between the Unit Controller
and the zone sensor.This is an alterntive to the wired zone
sensor when access and routing of communicaiton cable is an
issue. It also allows very flexible mounting and relocation of
zone sensors

10

VAV-PRC012-EN

Features and Benefits

Pneumatic Controller
Pneumatic Controller
Pneumatic—Pneumatic controllers provide
proven reliability and performance. A full line
of options provide:
•

Highest quality PVR available, which
maximizes zone temperature control.

Pressure-independent operation
•

AllVariTrane pneumatic controllers use the
patented flow sensor input to provide the
most accurate performance available.

Binary Input Controller

Integration Options (Interfacing with other control systems) - Trane offers three ways to
interface with other control systems.
1. UseTrane LonMark, factory-commissioned VAV controllers
2. UseTrane Binary Input Controller (BIC). BIC allows system control through binary logic.This
means that a control system on an existing campus, or those seeking “Analog noncommunicating control” can control aTrane DDCVAV unit via basic binary contact closures, like
relays, etc.This can be a cost effective interface option where a fullTrane DDC VAV System is
not available.
3. UseTrane BACnet™ factory-commissioned VAV controllers.

Factory-installed vs. Factory-commissioned:
The terms factory-installed and factory-commissioned are often used interchangeably.Trane takes
great pride in being the industry leader in factory-commissioned DDC controllers. Table
differentiates these concepts.
Factory-commissioned controllers provide the highest quality and most reliable units for yourVAV
system. Additional testing verifies proper unit operation including occupied/unoccupied airflow,
temperature setpoints, communication link functionality, and output device functionality.The
benefits of factory-commissioning are standard on VariTrane terminal units withTrane DDC
controls.This means that factory-commissioned quality on VariTrane VAV units is now available
on ANY manufacturer’s control system that can communicate using the LonMark Space Comfort
Control (SCC) protocol. (See Controls section for complete listing of variables which are
communicated.
Table 1.

Factory-installed vs. factory-commissioned
Factory-installed

Factory-commissioned

Transformer installed (option)

X

X

Wires terminated in reliable/consistent setting

X

X

Controller mounted

X

X

Electric heat contactors and fan relay wired

X

X

VAV-PRC012-EN

11

Features and Benefits

Table 1.

Factory-installed vs. factory-commissioned
Factory-installed

Factory-commissioned

Testing of electric heat contactors and fan relay

X

Controller addressing and associated testing

X

Minimum & Maximum airflows settings (occupied/unoccupied)

X

Minimum & Maximum temperature setpoints (occupied/unoccupied)

X

Minimum ventilation requirements

X

Thumbwheel enable/disable

X

Heating offset

X

Wireless communications modules (WCI)

X

Wireless zone sensor

X

X

Indoor Air Quality Management During Construction
LEED wrap option is a pressure sensitive
covering that prevents contamination of the
VAV box during the construction phase. It is
utilized to seal all openings without
constraining the installation process.

Trane VAV Systems - Proven Performance
Trane is the industry leader in VAV systems, including factory-commissioned controls and
integration with other control systems.This leadership began with customers seeking the most
reliable VAV products in the industry.The solution was factory-commissioned controls (see
Factory-installed vs. Factory-commissioned). Since then, it has blossomed to include optimized
system control strategies.
Control strategies are often made more complicated than necessary. VariTrane DDC controls
simplify control strategies by pre-engineering control logic and sequencing into the controller.This
information is available via a twisted-shielded wire pair, and accessible via aTraneTracer™ SC
building automation system. Data is easily accessed via a computer workstation.
Optimized system control strategies, such as ventilation optimization, fan-pressure optimization,
and optimal start/stop, are pre-engineered in VariTrane™ unit-level DDC controllers and theTracer
SC building automation system.
This allows aTrane VAV system to meet or exceed the latest ASHRAE 90.1 Energy Efficiency
standards. Pre-engineered controls allow consistent, high quality installations which are very
repeatable.The end result is PROVEN control strategies you can rely on to perform. For more
information on these and other control strategies, contact your localTrane Sales Office, or visit
www.trane.com.
Purchasing VAV controllers and VAV hardware from a single manufacturer provides a single
contact for all HVAC system related questions.

12

VAV-PRC012-EN

Agency Certifications
There are numerous regulations and standards in the industry that determine the construction and
performance parameters for VAV terminal units. Some of the more important of those standards
and regulations are listed below, along with a brief description of what each one addresses.

American Society of Heating, Refrigerating and Air-conditioning Engineers
(ASHRAE) - 41.1
ASHRAE - 41.2
ASHRAE - 41.3
These standards specify methods for temperature measurement (41.1), laboratory airflow
measurement (41.2), and pressure measurement (41.3). While none of these standards specifically
discusses VAV air terminals, they discuss topics that are aspects of terminal box systems.
Therefore, some engineers will include these standards in their specifications as a primer on
accepted measurement techniques.
ASHRAE - 62
This standard specifies the minimum ventilation rates and indoor air quality that are acceptable for
occupied spaces.
ASHRAE - 111
This standard calls out procedures to be followed for testing and balancing HVAC systems. It
includes descriptions of the equipment used, procedures followed, and field changes that must be
made when a system is balanced.

Air-Conditioning, Heating and Refrigeration Institute (AHRI)
AHRI 880
This standard sets forth classifications, performance testing requirements, and test results
reporting requirements for air terminal units.The standard contains very detailed procedures that
are to be followed for the testing and certification program associated with this standard.This is
one of the most commonly referenced standards in the VAV terminal unit industry.The AHRI-880
certification program is designed to police the accuracy of documented performance for terminal
units.The certification program requires a sampling of at least four units be tested annually.The
tested units are chosen at random by AHRI and sent to an independent laboratory for the testing.
The performance is tested at one specific operating condition.The operating characteristics tested
include discharge and radiated sound power (for the damper and, in the case of fan-powered
boxes, the fan), wide-open damper pressure drop, and fan motor amp draw. VariTrane terminal
units are certified according to AHRI-880.
AHRI 885
This document provides a procedure to estimate sound pressure levels in an occupied space.The
standard accounts for the amount of sound pressure in the space due to the VAV air terminal,
diffusers and their connecting low pressure ductwork. While sound generated from the central
system fan and ductwork may be a significant factor in determining the sound pressure level in the
room, this standard does not address those factors. It focuses solely on theVAV terminal and items
downstream of it.This standard is related to AHRI-880 by using sound power determined using
AHRI-880 methodology as a starting point for the AHRI-885 procedure.

Underwriter’s Laboratory (UL) 1995
Underwriter’s Laboratory is an independent testing agency that examines products and
determines if those products meet safety requirements. Equipment manufacturers strive to meet
UL guidelines and obtain listing and classifications for their products because customers recognize
UL approval as a measure of a safely designed product. VariTrane VAV air terminals are listed
per UL-1995, Heating and Cooling Equipment.The terminals are listed as an entire assembly.

VAV-PRC012-EN

13

Agency Certifications

National Fire Protection Association
NFPA 70
This standard is also known as the National Electrical Code (NEC).The Code gives standards for
installation of wiring and electrical equipment for most types of commercial and residential
buildings. It is often referred to inVAV air terminal specifications when fan-powered boxes, electric
heat or electric controls are included.
NFPA 90A
This standard does not speak directly to VAV air terminals but does discuss central system
considerations pertaining to a fire and/or smoke condition.The standard discusses safety
requirements in design and construction that should be followed to keep the air-handling system
from spreading a fire or smoke.The standard specifies practices that are intended to stop fire and
smoke from spreading through a duct system, keep the fire-resistive properties of certain building
structures (fire walls, etc.) intact, and minimize fire ignition sources and combustible materials.

14

VAV-PRC012-EN

Model Number Descriptions
Digit 1, 2—Unit Type
VP =
VS =
LP =
LS =

VariTrane™ Fan-Powered Parallel
VariTrane Fan-Powered Series
VariTrane Fan-Powered
Low-Height Parallel
VariTrane Fan-Powered
Low-Height Series

Digit 3—Reheat
C =
E =
W =

Cooling Only
Electric Heat
Hot Water Heat

Digit 4—Development Sequence
F

=

Sixth

Digit 5, 6—Primary Air Valve
05 =
06 =
08 =
10 =
12 =
14 =
16 =
RT =
Note:

5" inlet (350 max cfm)
6" inlet (500 max cfm)
8" inlet (900 max cfm)
10" inlet (1400 max cfm)
12" inlet (2000 max cfm)
14" inlet (3000 max cfm)
16" inlet (4000 max cfm)
8" x 14" inlet (1800 max CFM)
10, 12, 14, 16 Not Available on LowHeight

Digit 7, 8—Secondary Air Valve
00 =

N/A

Digit 9—Fan
P
Q
R
S
T
U
V
W
X

=
=
=
=
=
=
=
=
=

02SQ fan (500 nominal cfm)
03SQ fan (1100 nominal cfm)
04SQ fan (1350 nominal cfm)
05SQ fan (1550 nominal cfm)
06SQ fan (1850 nominal cfm)
07SQ fan (2000 nominal cfm)
08SQ Fan (500 nominal cfm)
09SQ Fan (900 nominal cfm)
10SQ Fan (1800 nominal cfm)

Digit 10, 11—Design Sequence
** =

Factory assigned

Digit 12, 13, 14, 15—Controls
DD01=
DD02=
DD03=
DD04=
DD05=
DD07=
DD11=
DD12=
DD13=
DD14=
DD15=
DD17=
DD23=
DD28=

Cooling Only Control
N.C. On/Off Hot Water
Prop. Hot Water
Staged On/Off E-Heat
Pulse Width Mod of E-Heat
N.O. On/Off Hot Water
VV550 DDC Controller - Cooling
Only
VV550 DDC Ctrl w/N.C. On/Off
HW Valve
VV550 DDC Ctrl w/Prop. HW
Valve
VV550 DDC Ctrl - On/Off
Electric Heat
VV550 DDC Ctrl w/Pulse Width
Modulation
VV550 DDC Ctrl w/N.O. On/Off
HW Valve
VV550 DDC- Basic plus- Local
(Electric heat- PWM) Remote
(Staged EH)
VV550 DDC-Basic plus- Local

VAV-PRC012-EN

(Water heat- N.O. 2-position)
Remote (Water- N.O. 2-position)
DD29= VV550 DDC-Basic plus- Local
(Water heat- N.C. 2-position)
Remote (Water- N.C. 2-position)
DD30= VV550 DDC-Basic plus- Local
(Water heat- N.O. 2-position)
Remote (Water- N.C. 2-position)
DD31= VV550 DDC-Basic plus- Local
(Water heat- N.C. 2-position)
Remote (Water- N.O. 2-position)
DD32= VV550 DDC-Basic plus- Local
(Electric heat- Staged) Remote
(Staged EH)
DD41= UC400 DDC-Basic (No water or
electric heat)
DD42= UC400 DDC-Basic (Water heatNormally Closed- 2 position)
DD43= UC400 DDC-Basic (Water heatModulating)
DD44= UC400 DDC-Basic (Electric heatstaged)
DD45= UC400 DDC-Basic (Electric heatPWM)
DD47= UC400 DDC-Basic (Water heatNormally Opened- 2 position)
DD53= UC400 DDC-Basic plus- Local
(Electric heat- PWM) Remote
(Staged EH)
DD58= UC400 DDC-Basic plus- Local
(Water heat- N.O. 2-position)
Remote (Water- N.O. 2-position)
DD59= UC400 DDC-Basic plus- Local
(Water heat- N.C. 2-position)
Remote (Water- N.C. 2-position)
DD60= UC400 DDC-Basic plus- Local
(Water heat- N.O. 2-position)
Remote (Water- N.C. 2-position)
DD61= UC400 DDC-Basic plus- Local
(Water heat- N.C. 2-position)
Remote (Water- N.O. 2-position)
DD62= UC400 DDC-Basic plus- Local
(Electric heat- Staged) Remote
(Staged EH)
DD65= Basic (Electric Heat- Modulating
SCR)
DD66= Basic plus – Local (Electric heat –
Modulating SCR) Remote
(Staged EH)
DD71= UC210 DDC-Basic
(Cooling only)
DD72= UC210 DDC-Basic
(Water heat-nc 2pos)
DD73= UC210 DDC-Basic
(Water heat-Modulating)
DD74= UC210 DDC-Basic
(Electric heat-staged)
DD75= UC210 DDC-Basic
(Electric heat-pwm)
DD77= UC210 DDC-Basic
(Water heat-NO 2pos)
DD83= UC210 DDC-Basic+ Local
(Electric heat-pwm)
Remote (Staged)

DD84= UC210 DDC-Basic+ Local
(Water heat Modulating)
Remote (Water-NC 2pos)
DD85= UC210 DDC-Basic+ Local
(Water heat Modulating)
Remote (Water-NO 2pos)
DD86= UC210 DDC-Basic+ Local
(Water heat NO 2pos)
Remote (Water-Modulating)
DD87= UC210 DDC-Basic+ Local
(Water heat NC 2pos)
Remote (Water-Modulating)
DD88= UC210 DDC-Basic+ Local
(Water heat NO 2pos)
Remote (Water-NO 2pos)
DD89= UC210 DDC-Basic+ Local
(Water heat NC 2pos)
Remote (Water-NC 2pos)
DD90= UC210 DDC-Basic+ Local
(Water heat NO 2pos)
Remote (Water-NC 2pos)
DD91= UC210 DDC-Basic+ Local
(Water heat NC 2pos)
Remote (Water-NO 2pos)
DD92= UC210 DDC-Basic+ Local
(Electric heat-staged)
Remote (Staged)
DD95= UC210 DDC-Ctrl w/Modulating
SCR
DD96= UC210 DDC-SpaceTemp Ctrl w/
Local SCR & Remote Stge Elec
Heat
DD00= Trane Actuator Only
ENCL= Shaft Only in Enclosure
ENON= Shaft Out Side for Electric Units
FM00= Other Actuator and Control
FM01= Trane supplied actuator,
other control
PN00= N.O. Actuator and Linkage Only
PN05= N.O. 3000 Series, RA Stat
PN51= Pneumatic normally open
w/3011,DPS fan
PN52= Pneumatic normally open
w/3011, DPM fan
PNON= Shaft Out Side for Pneumatic
Units
N.C. = Normally-closed
N.O. = Normally-opened
DA Stat = Direct-acting pneumatic t-stat
(by others)
RA Stat = Reverse-acting pneumatic
t-stat (by others)
PN = Pneumatic
FM = Factory installation of customersupplied controller
PVR = Pneumatic Volume Regulator

Digit 16—Insulation
A
B
D
F
G

=
=
=
=
=

1/2” Matte-faced
1" Matte-faced
1" Foil-faced
1" Double-wall
3/8” Closed-cell

Digit 17—Motor Type
D
E

=
=

PSC Motor
High-efficiency motor (ECM)

15

Model Number Descriptions

Digit 18—Motor Voltage

Digit 26—Electric Heat Voltage

Digit 35—Wireless Sensors

1
2
3
4
5

0 =
A =
B =
C =
D =
E =
F =
G =
H =
J =
K =
Note:

0
1

=
=

2

=

=
=
=
=
=

115/60/1
277/60/1
347/60/1
208/60/1
230/50/1

Digit 19—Outlet Connection
1
2

=
=

Flanged
Slip & Drive

Digit 20—Attenuator
0 =
W =

No Attenuator
With Attenuator

Digit 21—Water Coil
0
1
2
3
4
5
6
A
B
C

=
=
=
=
=
=
=
=
=
=

D

=

E

=

F

=

Note:

None
1-Row–Plenum inlet installed RH
2-Row–Plenum inlet installed RH
1-Row–Discharge installed, LH
1-Row–Discharge installed, RH
2-Row–Discharge installed, LH
2-Row–Discharge installed, RH1
1-Row–Premium water coil inlet
2-Row–Premium water coil inlet
1-Row–Premium hot coil
on discharge, LH
1-Row–Premium hot coil
on discharge, RH
2-Row–Premium hot coil
on discharge, LH
2-Row–Premium hot coil
on discharge, RH
1- and 2-row not available with
Low-Height

Digit 22—Electrical Connections
L

=

R

=

W =
X

=

Note:

Left (Airflow hitting you in the
face)
Right (Airflow hitting you in the
face)
Narrow Corridor LH, Hi-Volt Inlet
Facing
Narrow Corridor RH, Hi-Volt Inlet
Facing
(W & X) Fan Powered Series Only

Digit 27, 28, 29—Electric Heat
kW

=

0 =
1 =
2 =
3 =
Note:

=
=
=
=

None
Factory Mounted DTS
HW Valve Harness
Both DTS & HW Valve Harness

None
1 Stage
2 Stages Equal
3 Stages Equal
3 not available with Low Height

0 =
1 =
2 =
3 =
4 =
5 =
6 =
Note:

None
24-volt magnetic
24-volt mercury
PE with magnetic
PE with mercury
SCR heat UC400
SCR heat FMTD/ENCL/DD00
SCR cannot be selected with the
following configuration:
• KW > 10, 208 volt 3 phase, Low
Height
•

KW > 22, 480 volt 3 phase, Low
Height

•

Voltage = 575 volt

Digit 32—Airflow Switch
0 =
W =

None
With

Digit 33—Not Used

Digit 25—Power Fuse

0

0 =
W =

Digit 34—Actuator

16

0
1
2
3

Digit 31—Contactors

Digit 24—Disconnect Switch

None
With

Digit 36—Pre-Wired Factory
Solutions

Digit 30—Electric Heat Stages

N/A (provided as standard)

0 = None
W = With
Electric Reheat w/ door interlocking
power disconnect, Cooling Only and
Water Reheat w/ toggle disconnect

Note:

None
Factory Mounted Wireless
Receiver (Sensor Assembly)
Wireless Comm Interface
Modular FM
All sensors selected in accessories

000 = None
050 = 0.5 kW
010 = 1.0 kW
015 = 1.5 kW
260 = 26.0 kW
Note: Electric Heat Voltage 0.5 to 8.0 kW–½ kW increments
8.0 to 18.0 kW –1 kW increments
18.0 to 46.0 kW–2 kW increments

Digit 23—Transformer
0

None
208/60/1
208/60/3
240/60/1
277/60/1
480/60/1
480/60/3
347/60/1
575/60/3
380/50/3
120/60/1
K not available with Low Height

0
A

=
=
=

N/A
Standard
Belimo actuator

VAV-PRC012-EN

Selection Procedure
This section describes elements and process required to properly select fan-powered VAV
terminals, and includes a specific examples. Selection procedure is iterative in nature which makes
computer selection desirable. Selection of fan-powered VAV terminals involves four elements:
• Air valve selection
• Heating coil selection
• Fan size and selection
• Acoustics
Note: Use the same procedures for selecting Low-Height Fan-Powered Units.

Air Valve Selection
Provided in the Performance Data—Air Pressure Requirements section of the catalog is the unit air
pressure drop at varying airflows.To select an air valve, determine the airflow required at design
cooling. Next, select an air valve diameter that will allow proper airflow modulation, (a velocity of
1600 – 2000 FPM is recommended). Keep in mind that modulation below 300 FPM is not
recommended. Proper selection requires defining the minimum valve airflow (in either heating
or cooling) and maintaining at least 300 FPM through the air valve.The minimum is typically set
based on ventilation requirements. If zone ventilation does not come through the VAV unit, a
minimum valve position can also be zero.

Heating Coil Selection
Supply Air Temperature
The first step required when selecting a heating coil is to determine the heating supply air
temperature to the space, calculated using the heat transfer equation. A recommended value is
90°F, although values between 85°F and 95°F are common. Discharge air temperatures that exceed
20 degrees above space temperature are not recommended for proper diffuser operation. Air
temperature difference is defined as the heating supply air temperature to the space minus the
winter room design temperature.The zone design heat loss rate is denoted by the letter Q. Supply
air temperature to the space equals the leaving air temperature (LAT) for the terminal unit.

Coil Leaving Air Temperature
Once the terminal unit LAT is determined, the heating requirements for the coil can be calculated.
The leaving air temperature for the coil of a parallel fan-powered terminal unit varies based on the
type of unit installed heat being selected. Series unit leaving air temperatures do not vary because
in each case the coil is located on the unit discharge.
Electric coil LAT equals terminal unit LAT because the coil is located on the unit discharge. Hot water
coils can be located on either the discharge or, for maximum system efficiency, the plenum inlet
when located on the entering air side of the fan. Coil LAT is calculated using a mixing equation.
Given the unit heating airflow and LAT, minimum primary airflow at its supply air temperature, and
the volume of heated plenum air, the leaving air temperature for the hot water coil can be
determined (see the unit selection example that follows for more details).

Coil Entering Air Temperature
The entering air temperature (EAT) to the coil also varies based on the coil position on the unit for
parallel units.The unit heat is mounted on the discharge of a series unit.Therefore the EAT equals
the temperature of blended primary and plenum air.
Parallel electric coils are mounted on the unit discharge. Hot water coils can be mounted on the
discharge or on the plenum inlet. Plenum inlet mounting creates a more efficient VAV system.This
is because the parallel fan is energized only when in heating mode, and thus, when in cooling
mode, the water coil is not in the airstream.
The EAT for discharge mounted coils equals the temperature of blended primary air and plenum
air. For plenum inlet mounted water coils, the EAT equals the plenum air temperature.

VAV-PRC012-EN

17

Selection Procedure

Capacity Requirement
Once both coil EAT and LAT are determined, the heat transfer (Q) for the coil must be calculated
using the heat transfer equation. For electric heat units, the Q value must be converted from Btu
to kW for heater selection.The required kW should be compared to availability charts in the
performance data section for the unit selected. For hot water heat units, reference the capacity
charts in the performance data section for the required heat transfer Q and airflow to pick the
appropriate coil.

Fan Size and Selection
Fan Airflow
Fan airflow is determined by calculating the difference between the unit design heating airflow and
minimum primary airflow.

Fan External Static Pressure
Fan external static pressure is the total resistance experienced by the fan, which may include
downstream ductwork and diffusers, heating coils, and sound attenuators. As total airflow varies
so will static pressure, making calculation of external static pressure dependent on unit type.
In many applications of parallel terminals, a minimum primary airflow must be maintained to meet
ventilation requirements.This primary airflow contributes to the total resistance experienced by
the fan and should be accounted for in all components downstream of the fan itself, including
electric coils. Hot water coils positioned on the fan inlet are not affected by the additional primary
airflow.The static pressure resistance experienced by the fan due to the hot water coil is based on
fan airflow only, not the total heating airflow.
With series fan-powered terminal units, all airflow passes through the fan. External static pressure
requirements are the sum of the individual component pressure retirements at the design airflow
of the unit.

Fan Motor Type
The fan motor type that will be used for the unit will need to be known before fan selection can
begin.The ECM motor offers more efficient operation than the standard single-speed PSC motor
and will use different fan curves. Because series fans operate in both heating and cooling mode,
payback is typically 2–3 years for the premium ECM option. Refer to the Features and Benefits
section to determine which motor is more appropriate for the unit

Selection
Once fan airflow and external static pressure are determined, reference the fan curves in the
performance data section. Cross plot both airflow and external static pressure on each applicable
graph. A selection between the minimum and maximum airflow ranges for the fan is required.
It is common to identify more than one fan that can meet the design requirements.Typically,
selection begins with the smallest fan available to meet capacity. If this selection does not meet
acoustical requirements, upsizing the fan and operating it at a slower speed can be done for quieter
operation.

Acoustics
Air Valve Generated Noise
To determine the noise generated by the air valve, two pieces of information are required; design
airflow and design air pressure drop.The design air pressure drop is determined by taking the
difference between design inlet and static pressure (the valve’s most over-pressurized condition)
and external static pressure at design cooling flow.This represents a worst-case operating
condition for the valve.

18

VAV-PRC012-EN

Selection Procedure

Fan Generated Noise
To determine fan noise levels, fan airflow, external static pressure and speed information is
required.

Evaluation Elements
For parallel fan-powered terminal units, the air valve and fan operation must be evaluated
separately because these operations are not simultaneous. For Series fan-powered units, the air
valve and fan are evaluated together because they have simultaneous operation. Access the
appropriate acoustics table(s) of the catalog and determine the sound power and NC prediction for
both the discharge and radiated paths. It is important to understand that discharge air noise is
generally not a concern with fan-powered terminals. Radiated noise from the unit casing typically
dictates the noise level of the space. If the entire unit or any element of it is generating noise in
excess of the Noise Criteria requirements, the size of the appropriate portion of the terminal should
be increased. Because the selection procedure is iterative, care should be taken by the designer to
confirm that the change in selection does not affect other elements of the unit or system design.

Selection Example—Parallel With Hot Water Heat
Air Valve Selection
Design Cooling Airflow:1000 cfm
Minimum Ventilation Airflow: 200 cfm
Maximum Unit APD: 0.25 in. wg
Choose 10" air valve
Check – Is minimum airflow above 300 FPM? Guidelines, FPP 8)
A 10" air valve is selected with unit pressure drop = 0.01 in. wg

Heating Coil Selection
Required Information:
Zone design heat loss: 20000 Btu
Unit heating airflow: 600 cfm
Winter room design temp.: 68ºF
Coil entering water temp.: 180ºF
Minimum primary airflow: 200 cfm
Fan Airflow: 400 cfm
Plenum temperature: 70ºF
Coil flow rate: 2 gpm
Primary air temperature: 55ºF

Heat Transfer Equation (Btu)
Q = 1.085 x Cfm x DTemperature
For the heating zone, the temperature difference is the zone supply air temperature (SAT) minus
the winter room design temperature.
18000 Btu = 1.085 x 600 x (SAT - 68ºF)
SAT = 95.6ºF
Because the designer chose to maximize system efficiency by having the hot water coil on the
plenum inlet, the unit supply air temperature is equal to the mix of the heated plenum air from the
fan and the minimum primary airflow.
600 cfm x 95.6ºF =
200 cfm x 55ºF +
(600 cfm - 200 cfm) x Coil LAT
Coil LAT = 116ºF

VAV-PRC012-EN

19

Selection Procedure

For the heating coil, the temperature difference is the calculated coil LAT minus the coil EAT
(Plenum AirTemperature).
Coil Q = 1.085 x 400 x (116-70) = 19,964 Btu = 19.96 Mbh

Coil Performance Table
Selection:
Size 02SQ fan, 1-row coil with 2 gpm =20.53 Mbh (at 400 cfm)
1-row coil with 2 gpm = 2.57 ft WPD

Fan Selection
Required Information:
Design airflow: 400 cfm
Downstream static pressure at design airflow: 0.25 in. wg
Fan external static pressure equals downstream static pressure (ductwork and diffusers) plus coil
static pressure.The coil static pressure that the fan experiences is at the fan airflow (400 cfm).The
downstream static pressure the fan experiences is at fan airflow plus minimum primary airflow.
The sum of fan airflow and minimum primary airflow (600 cfm) is less than design airflow (1000
cfm) and therefore the 0.25 in. wg downstream static pressure at design airflow must be adjusted
for the lower heating airflow.

Parallel Fan-Powered Unit with Water Coil (2 Options)
Plenum Inlet Mounted

Discharge Mounted

Using Fan Law Two:
Heating Downstream Static Pressure = (600/1000)2 x 0.25 = .09 in. wg
A size 02SQ fan has the capability to deliver approximately 650 cfm at 0.09 downstream static
pressure. If an attenuator is required, use the attenuator air pressure drop tables to define
additional fan static pressure.
Acoustics
Required Information:
Design inlet static press.: 1.0 in. wg
NC criteria: NC-35
The selection is a VPWF Parallel Fan-poweredTerminal Unit, 10" primary, parallel fan size 02SQ,
with a 1-row hot water coil.
Determine the casing radiated noise level because it typically dictates the sound level (NC) of the
space. With a parallel unit, two operating conditions must be considered, design cooling and
design heating.

20

VAV-PRC012-EN

Selection Procedure

Design Cooling (1000 cfm). Radiated valve typically sets the NC for parallel units in cooling mode.
The closest tabulated condition (1100 cfm at 1.0 in. wg ISP) has an NC=31. (A more accurate
selection can be done viaTOPSS electronic selection program.):
Table 2.

Selection Program Output (Radiated Valve):

Octave Band

2

3

4

5

6

7

NC

Sound Power

65

60

53

48

41 32

30

Design Heating (200 cfm valve, 400 cfm fan, 0.25 in. wg DSP). Radiated fan typically sets the NC
for parallel units in heating mode.The closest cataloged condition (430 fan cfm , 0.25 in. wg DSP)
has an NC=32. (A more accurate selection can be done viaTOPSS electronic selection program.)
Table 3.

Selection Program Output (Radiated Fan):

Octave Band 2

3

4

5

6

7

NC

Sound Power

58

56

52

48

41

31

66

The predicted NC level for design cooling is NC-30 and for design heating is NC-31. If the catalog
path attenuation assumptions are acceptable, this unit meets all of the design requirements and
the selection process is complete.
Computer Selection
The advent of personal computers has served to automate many processes that were previously
repetitive and time-consuming. One of those tasks is the proper scheduling, sizing, and selection
of VAV terminal units.Trane has developed a computer program to perform these tasks.The
software is called theTrane Official Product Selection System (TOPSS).
TheTOPSS program will take the input specifications and output the properly sized VariTrane VAV
terminal unit along with the specific performance for that size unit.
The program has several required fields, denoted by red shading in theTOPSS screen, and many
other optional fields to meet the criteria you have. Required values include maximum and
minimum airflows, control type, and model. If selecting models with reheat, you will be required
to enter information to make that selection also.The user is given the option to look at all the
information for one selection on one screen or as a schedule with the other VAV units on the job.
The user can select single-duct, dual-duct, and fan-powered VAV boxes with the program, as well
as most otherTrane products, allowing you to select all yourTrane equipment with one software
program.
The program will also calculate sound power data for the selected terminal unit.The user can enter
a maximum individual sound level for each octave band or a maximum NC value.The program will
calculate acoustical data subject to default or user supplied sound attenuation data.
Schedule View
The program has many time-saving features such as:
•

Copy/Paste from spreadsheets like Microsoft® Excel

•

Easily arranged fields to match your schedule

•

Time-saving templates to store default settings

The user can also export the Schedule View to Excel to modify and put into a CAD drawing as a
schedule.
Specific details regarding the program, its operation, and how to obtain a copy of it are available
from your localTrane sales office.

VAV-PRC012-EN

21

Selection Procedure

Selection Example—Series With Hot Water Heat and ECM
Air Valve Selection
Required Information: Design cooling airflow: 1000 cfm
Minimum ventilation airflow: 200 cfm
Maximum unit APD: 0.40 in. wg
A 10" air valve is selected.
Check–is minimum airflow above 300 FPM?
Answer–Yes. Minimum cfm allowable = 165 cfm. (See
General Data—Valve/Controller Guidelines pp FPS 8).
The 03SQ fan will be used in this instance. By interpolating,
you can choose a 10" air valve with wide-open air pressure
drop of 0.32 in. wg.

Heating Coil Selection
Required Information: Zone design heat loss: 30000 Btu
Design heating airflow: 1000 cfm
Winter room design temp.: 68ºF
Coil entering water temp.: 180ºF
Minimum primary airflow: 200 cfm
Plenum temperature: 70ºF
Primary air temperature: 55ºF
Coil flow rate: 2 gpm
HeatTransfer Equation (Btu) Q = 1.085 x Cfm x Temperature
For the heating zone, the temperature difference is the zone supply air temperature (SAT) minus
the winter room design temperature.
30000 Btu = 1.085 x 1000 x (SAT-68°F)
SAT = 96ºF
Because the hot water coil is on the unit discharge of a series fan-powered unit, the unit supply air
temperature is equal to the coil LAT. Coil entering air temperature (EAT) is a mix of plenum air and
the minimum primary airflow.
1000 cfm x Coil EAT = 200 cfm x 55ºF + (1000 cfm - 200 cfm) x 70ºF
Coil EAT = 67ºF
For the heating coil, the temperature difference is the calculated coil LAT minus the coil EAT
(Plenum AirTemperature).
Coil Q =1.085 x 1000 x (96-70) = 31,465 Btu
On a series unit the hot water coil is located on the discharge, so the total heating airflow, 1000 cfm,
passes through the coil.

Coil Performance Table
Selection:
Performance:
Size 03SQ fan, 1-row coil at 2 gpm = 32.23 MBh
1-row Coil at 2 gpm= 0.83 ft WPD

Fan Selection
Required Information. Fan airflow: 1000 cfm
Downstream static pressure at design airflow: 0.25 in. wg
A size 03SQ fan can operate at up to 1150 cfm (1-row coil) or 1100 (2-row coil) and 0.25" downstream
static pressure. Inlet and coil selections should be verified withTOPSS electronic selections.
22

VAV-PRC012-EN

Selection Procedure

If an attenuator is required, use attenuator air pressure drop tables to define additional fan static
pressure.

Acoustics
Required Information. Design inlet static press: 0.75 in. wg
NC criteria (general office space): NC-40
The selection is a VSWF Series Fan-PoweredTerminal Unit, 10" primary, series fan size 03SQ, with
a 1-row hot water coil.
Determine the casing radiated noise level because it typically dictates the sound level
(NC) of the space. With a series unit, the air valve and fan operate simultaneously, so the chart
for air valve and fan sound data must be consulted.
The results in the below table are for the acoustics value of a size 10" air valve with a size 03SQ fan.
The predicted NC level for design conditions is NC-38.
Octave Band

2

3

4

5

6

7

NC

Sound Power

70

65

63

61

59

59

38

Note: Ensure water coil acoustical impact is considered. For this example, the appurtenance effect
adds one (1) NC to fan-only radiated sound. Because this does not set NC for this selection,
it can be overlooked.The addition of an attenuator (see same appurtenance effect tables
reduces the NC four (4) points, resulting in a final selection NC = 30 (if required).
Note: Do not overlook the water coil impact on acoustics. A good rule of thumb is that it will add
1 to 2 NC to “fan only” radiated sound for most applications.

Computer Selection
The advent of personal computers has served to automate many processes that were previously
repetitive and time-consuming. One of those tasks is the proper scheduling, sizing, and selection
of VAV terminal units.Trane has developed a computer program to perform these tasks.The
software is called theTrane Official Product Selection System (TOPSS).
TheTOPSS program will take the input specifications and output the properly sized VariTrane VAV
terminal unit along with the specific performance for that size unit.
The program has several required fields, denoted by red shading in theTOPSS screen, and many
other optional fields to meet the criteria you have. Required values include maximum and
minimum airflows, control type, and model. If selecting models with reheat, you will be required
to enter information to make that selection also.The user is given the option to look at all the
information for one selection on one screen or as a schedule with the other VAV units on the job.
User can select single-duct, dual-duct, and fan-powered VAV boxes with the program, as well as
most otherTrane products, allowing selection of allTrane equipment with one software program.
The program will also calculate sound power data for the selected terminal unit.The user can enter
a maximum individual sound level for each octave band or a maximum NC value.The program will
calculate acoustical data subject to default or user supplied sound attenuation data.

Schedule View
The program has many time-saving features such as:
• Copy/Paste from spreadsheets like Microsoft® Excel
• Easily arranged fields to match your schedule
• Time-saving templates to store default settings
User can also export Schedule View to Excel to modify and put into a CAD drawing as a schedule.
Specific details regarding program, its operation, and how to obtain a copy of it are available from
your localTrane sales office.

VAV-PRC012-EN

23

Performance Data
Parallel Fan-Powered Terminal Units
Table 4.

Primary airflow control factory setting-I-P

Control Type

Air Valve
Size (in.)

Maximum
Valve Cfm

Maximum
Controller Cfm

Minimum
Controller Cfm

Constant Volume
Cfm

5
6
8

350
500
900

40-350
60-500
105-900

0, 40-350
0, 60-500
0, 105-900

40-350
60-500
105-900

10
12
14
16

1400
2000
3000
4000

165-1400
240-2000
320-3000
420-4000

5
6
8

350
500
900

63-350
73-500
134-900

10
12
14
16

1400
2000
2885
3785

215-1400
300-2000
408-2887
536-3789

Direct Digital
Control/ UCM

Pneumatic with
Volume
Regulator

0,
0,
0,
0,

165-1400
240-2000
320-3000
420-4000

63-350
73-500
134-900

0, 63-350
0, 73-500
0, 134-900
0,
0,
0,
0,

165-1400
240-2000
320-3000
420-4000

215-1400
300-2000
408-2887
536-3789

215-1400
300-2000
408-2887
536-3789

Note: Maximum airflow must be greater than or equal to minimum airflow.

Table 5.

Primary airflow control factory settings – SI

Control Type

Air Valve
Size (in.)

Maximum
Valve L/s

Maximum
Controller L/s

Minimum
Controller L/s

Constant
Volume L/s

5
6
8

165
236
425

19-165
28-236
50-425

0, 19-350
0, 28-236
0, 50-425

19-350
28-236
50-425

10
12
14
16

661
944
1416
1888

77-661
111-944
151-1416
198-1888

0, 77-661
0, 111-944
0, 151-1416
0, 198-1888

77-661
111-944
151-1416
198-1888

5
6
8

165
236
425

30-165
35-236
63-425

0, 30-165
0, 35-236
0, 63-425

30-165
35-236
63-425

10
12
14
16

661
944
1362
1787

102-661
141-944
193-1363
253-1788

0, 102-661
0, 141-944
0, 193-1363
0, 253-1788

102-661
141-944
193-1363
253-1788

Direct Digital
Control/ UCM

Pneumatic with
Volume
Regulator

Note: Maximum airflow must be greater than or equal to minimum airflow.

Table 6.

Unit air pressure drop – in. wg (I-P)

Fan/Inlet Size

Airflow Cfm Cooling Only

Fan/Inlet Size

Airflow Cfm Cooling Only

02SQ-05

40
150
250
350

0.01
0.03
0.08
0.17

04SQ-14

320
1200
2100
3000

0.01
0.01
0.01
0.01

02SQ-06

60
200
350
500

0.01
0.05
0.17
0.35

05SQ-10

165
550
950
1400

0.01
0.01
0.02
0.05

240
750
1350
2000

0.01
0.01
0.01
0.01

Note: Unit pressure drops do not include hot water coil or attenuator pressure drops.

02SQ-08

24

105
350
600
900

0.01
0.03
0.09
0.21

05SQ-12

VAV-PRC012-EN

Performance Data

Table 6.

Unit air pressure drop – in. wg (I-P) (continued)

Fan/Inlet Size

Airflow Cfm Cooling Only

Fan/Inlet Size

Airflow Cfm Cooling Only

02SQ-10

165
550
950
1400

0.01
0.01
0.01
0.01

05SQ-14

320
1200
2100
3000

0.01
0.01
0.01
0.01

03SQ-06

60
200
350
500

0.01
0.06
0.19
0.40

06SQ-10

165
550
950
1400

0.01
0.01
0.01
0.01

03SQ-08

105
350
600
900

0.01
0.03
0.08
0.20

06SQ-12

240
750
1350
2000

0.01
0.01
0.01
0.01

03SQ-10

165
550
950
1400

0.01
0.01
0.02
0.05

06SQ-14

320
1200
2100
3000

0.01
0.01
0.01
0.01

03SQ-12

240
750
1350
2000

0.01
0.01
0.01
0.01

06SQ-16

420
1600
2800
4000

0.01
0.01
0.01
0.01

04SQ-08

105
350
600
900

0.01
0.03
0.08
0.20

07SQ-10

165
550
950
1400

0.01
0.01
0.01
0.01

04SQ-10

165
550
950
1400

0.01
0.01
0.02
0.05

07SQ-12

240
750
1350
2000

0.01
0.01
0.01
0.01

04SQ-12

240
750
1350
2000

0.01
0.01
0.01
0.01

07SQ-14

320
1200
2100
3000

0.01
0.01
0.01
0.01

07SQ-16

420
1600
2800
4000

0.01
0.01
0.01
0.01

Note: Unit pressure drops do not include hot water coil or attenuator pressure drops.

Table 7.

Coil air pressure drop – in. wg (I-P)
Fan Size

Airflow Cfm

1-Row HW (in. wg)

2-Row HW (in. wg)

02SQ

100
200
300
400
500

0.00
0.01
0.01
0.02
0.02

0.00
0.01
0.02
0.03
0.05

03SQ
04SQ
05SQ

250
500
750
1000
1250
1400

0.01
0.02
0.04
0.07
0.10
0.12

0.02
0.04
0.08
0.13
0.19
0.23

06SQ
07SQ

600
900
1200
1500
1800
2000

0.02
0.04
0.06
0.09
0.12
0.15

0.04
0.07
0.11
0.16
0.22
0.27

Note: HW Coil Only pressure drops do not include unit pressure drop.

VAV-PRC012-EN

25

Performance Data

Table 8.

Attenuator air pressure drop (I-P)

Fan Size

Plenum Cfm

Attenuator

Fan Size

Plenum Cfm

Attenuator

02SQ

50
200
350
500
650
750

0.00
0.00
0.01
0.02
0.04
0.06

05SQ

50
300
600
900
1200
1550

0.00
0.00
0.02
0.06
0.13
0.24

03SQ

50
250
500
750
1000
1200

0.00
0.00
0.00
0.00
0.01
0.06

06SQ

50
500
900
1300
1650
1900

0.00
0.01
0.03
0.06
0.10
0.14

04SQ

50
300
600
900
1200
1450

0.00
0.01
0.02
0.03
0.05
0.06

07SQ

50
500
1000
1500
2000
2500

0.00
0.01
0.04
0.08
0.15
0.25

Note: Plenum cfm = (Fan cfm)

Table 9.

Attenuator air pressure drop (SI)

Fan Size

Plenum L/s

Attenuator

Fan Size

Plenum L/s

Attenuator

02SQ

24
94
165
236
307
354

0
0
2
5
10
14

05SQ

24
142
283
425
566
731

0
1
5
15
32
61

03SQ

24
118
236
354
472
566

0
0
0
0
2
14

06SQ

24
236
425
613
779
897

0
2
7
15
26
35

24
142
283
425
566
684

0
3
5
8
11
14

24
236
472
708
944
1180

0
2
9
21
38
62

04SQ

07SQ

Note: Plenum cfm = (Fan cfm)

Table 10. Coil air pressure drop – Pa (SI)

26

Fan Size

Airflow L/s

1-Row HW (Pa)

2-Row HW (Pa)

02SQ

200
300
400
500
600

0
1
2
4
6

1
3
5
8
12

03SQ
04SQ
05SQ

118
236
354
472
590
661

2
5
10
17
25
31

4
11
21
33
47
57

VAV-PRC012-EN

Performance Data

Table 10. Coil air pressure drop – Pa (SI)
10
18
28
41
56
67

5
9
15
22
30
36

900
1200
1500
1800
2150
2500

06SQ
07SQ

Note: HW Coil Only pressure drops do not include unit pressure drop.

Table 11. Unit air pressure drop-Pa (SI)
Fan/Inlet Size

Airflow L/s

Cooling Only

Fan/Inlet Size

Airflow L/s

Cooling Only

02SQ-05

19
71
118
165

2
7
20
41

04SQ-14

151
566
991
1416

2
2
2
2

02SQ-06

28
94
165
236

2
13
41
86

05SQ-10

78
260
448
661

2
2
6
13

02SQ-08

50
165
283
425

2
8
23
51

05SQ-12

113
354
637
944

2
2
2
2

02SQ-10

78
260
448
661

2
2
2
3

05SQ-14

151
566
991
1416

2
2
2
2

03SQ-06

28
94
165
236

2
15
48
99

06SQ-10

78
260
448
661

2
2
2
2

03SQ-08

50
165
283
425

2
6
21
49

06SQ-12

113
354
637
944

2
2
2
2

03SQ-10

78
260
448
661

2
2
6
13

06SQ-14

151
566
991
1416

2
2
2
2

03SQ-12

113
354
637
944

2
2
2
2

06SQ-16

198
755
1321
1888

2
2
2
2

04SQ-08

50
165
283
425

2
6
21
49

07SQ-10

78
260
448
661

2
2
2
2

04SQ-10

78
260
448
661

2
2
6
13

07SQ-12

113
354
637
944

2
2
2
2

04SQ-12

113
354
637
944

2
2
2
2

07SQ-14

151
566
991
1416

2
2
2
2

07SQ-16

198
755
1321
1888

2
2
2
2

Note: Unit pressure drops do not include hot water coil or attenuator pressure drops.

VAV-PRC012-EN

27

Performance Data

In. wg
0.60

125

0.50

100

0.40

75

0.30

50

0.20

25

0.10
100

200

300

400

500

600

700

Cfm

47

94

142

189

236

283

330

L/s

120 cfm min
(57 L/s)

Discharge Static Pressure

Pa

Parallel 02SQ—PSC

150

Airflow

Parallel Fan Size 03SQ—PSC

Pa

In. wg

199

0.80

174

0.70

150

0.60

125

0.50

100

0.40

75

0.30

50

0.20

25

0.10
200

300

400

500

600

700

800

900

1000

1100

1200

1300 Cfm

94

142

189

236

283

330

378

425

472

519

566

614 L/s

Discharge Static Pressure

Minimum
1-row coil maximum
2-row coil maximum
Note: When attenuator is required, add inlet
attenuator pressure to discharge static
pressure for final fan performance.

250 cfm min
(118 L/s)

VPCF and VPEF maximum

Pa

In. wg

199

0.80

174

0.70

150

0.60

125

0.50

100

0.40

75

0.30

50

0.20

25

0.10
200

94

Parallel 04SQ—PSC

300 cfm min
(142 L/s)

Discharge Static Pressure

Airflow

400

600

800

1000

1200

1400

1600 Cfm

189

283

378

472

566

661

755 L/s

Airflow

28

VAV-PRC012-EN

Performance Data

Parallel 05SQ—PSC

In. wg
0.80

174

0.70

150

0.60

125

0.50

100

0.40

75

0.30

50

0.20

25

0.10
300

500

700

900

1100

1300

1500

1700

Cfm

142

236

330

425

519

614

708

802

L/s

350 cfm min
(165 L/s)

Discharge Static Pressure

Pa
199

Airflow

1-row coil maximum
2-row coil maximum
Note: When attenuator is required, add inlet
attenuator pressure to discharge static
pressure for final fan performance.

In. wg
0.80

174

0.70

150

0.60

125

0.50

100

0.40

75

0.30

50

0.20

25

0.10
400

600

800

1000

1200

1400

1600

1800

2000

2200 Cfm

189

283

378

472

566

661

755

850

944

1038 L/s

530 cfm min
(250 L/s)

Minimum

Discharge Static Pressure

VPCF and VPEF maximum

Parallel 06SQ—PSC

Pa
199

Airflow

Parallel 07SQ—PSC

Pa In. wg
0.80

174

0.70

150

0.60

125

0.50

100

0.40

75

0.30

50

0.20

25

0.10
500

700

900

1100

1300

1500

1700

1900

2100

2300

Cfm

236

330

425

519

614

708

802

897

991

1086

L/s

585 cfm min
(276 L/s)

Discharge Static Pressure

199

Airflow

VAV-PRC012-EN

29

Pa

In. wg

125

0.50

100

0.40

75

0.30

50

0.20

25

VPxF 03SQ—ECM

160 cfm min
(76 L/s)

Discharge Static Pressure

Performance Data

0.10
100
47

200

300

400

500

600

700

800

900

1000

1100

Cfm

94

142

189

236

283

330

378

425

472

519

L/s

Airflow

Pa

In. wg

125

0.50

100

0.40

75

0.30

50

0.20

25

0.10
200

VPxF 04SQ—ECM

1-row coil maximum
2-row coil maximum
Notes:
1. ECMs (Electrically Commutated Motors) are
ideal for systems seeking maximum motor
efficiency.
2. When attenuator is required, add inlet
attenuator pressure to discharge static
pressure for final fan performance.

220 cfm min
(104 L/s)

Minimum

Discharge Static Pressure

VPCF and VPEF maximum

94

400

600

800

1000

1200

1400

1600 Cfm

189

283

378

472

566

661

755 L/s

Pa

In. wg

125

0.50

100

0.40

75

0.30

50

0.20

25

0.10
200
94

VPxF 05SQ—ECM

280 cfm min
(132 L/s)

Discharge Static Pressure

Airflow

400

600

800

1000

1200

1400

1600

1800

2000

Cfm

189

283

378

472

566

661

755

850

944

L/s

Airflow

30

VAV-PRC012-EN

Performance Data

0.50

100

0.40

75

0.30

50

0.20

25

0.10
400

600

800

1000

1200

1400

1600

1800

2000

2200

Cfm

189

283

378

472

566

661

755

850

944

1038

L/s

530 cfm min
(250 L/s)

In. wg

1-row coil maximum
2-row coil maximum
Notes:
1. ECMs (Electrically Commutated Motors) are
ideal for systems seeking maximum motor
efficiency.
2. When attenuator is required, add inlet
attenuator pressure to discharge static
pressure for final fan performance.

Discharge Static Pressure

VPCF and VPEF maximum
Minimum

VPxF 06SQ—ECM

Pa
125

Airflow

Table 12. Heating capacity (MBh) - fan size 02SQ (I-P)

Rows

Water
Pressure
Gpm Drop (ft)

Airflow (Cfm)
100

150

200

250

300

350

400

450

500

550

600

1-Row
Capacity
MBH

0.5
1.0
2.0
3.0
4.0
5.0

0.22
0.76
2.65
5.54
9.39
14.17

9.20
9.79
10.01
10.12
10.19

11.49
12.50
12.87
13.07
13.19

13.14
14.52
15.04
15.32
15.49

14.45
16.17
16.84
17.19
17.41

15.56
17.60
18.39
18.82
19.09

16.52
18.87
19.79
20.29
20.60

17.38
20.02
21.07
21.64
22.00

18.16
21.09
22.26
22.90
23.30

18.93
22.08
23.38
24.09
24.54

19.64
23.02
24.44
25.22
25.71

20.30
23.90
25.44
26.29
26.83

2-Row
Capacity
MBH

1.0
2.0
3.0
4.0
5.0

1.30
4.41
9.08
15.18
22.66

9.97
10.29
10.40
10.45
10.48

13.83
14.58
14.83
14.95
15.03

17.07
18.39
18.83
19.05
19.18

19.81
21.78
22.46
22.80
23.00

22.13
24.82
25.76
26.23
26.52

24.13
27.56
28.77
29.40
29.78

25.85
30.03
31.54
32.32
32.80

27.35
32.27
34.09
35.04
35.62

28.67
34.31
36.45
37.56
38.25

29.83
36.18
38.63
39.92
40.72

30.86
37.90
40.67
42.13
43.03

Notes:
1. Fouling Factor = 0.0005 °F ft² h/Btu.
2. Capacity based on 70°F entering air temperature and 180°F entering water temperature.

VAV-PRC012-EN

31

Performance Data

Table 13. Heating capacity (MBh) - fan sizes 03SQ–05SQ (I-P)

Rows

Water
Pressure
Gpm Drop (ft)

Airflow (Cfm)
150

300

450

600

750

900

1.0
2.0
3.0
4.0
1-Row
5.0
Capacity
6.0
MBH
7.0
8.0
9.0
10.0

0.28
1.02
2.22
3.85
5.92
8.41
11.32
14.65
18.40
22.57

13.14
13.62
13.88
14.04
14.14
14.22
14.28
14.33
14.37

18.63
19.69
20.27
20.64
20.89
21.08
21.22
21.33
21.42

22.21
23.78
24.65
25.21
25.59
25.88
26.10
26.28
26.42

25.01
27.05
28.20
28.95
29.46
29.85
30.15
30.38
30.57

27.36
29.86
31.28
32.21
32.85
33.34
33.71
34.01
34.25

29.41
32.34
34.03
35.14
35.92
36.50
36.95
37.31
37.60

1050 1200 1350 1500 1650
31.30
34.58
36.54
37.82
38.73
39.41
39.94
40.36
40.71

33.00
36.63
38.84
40.31
41.35
42.13
42.73
43.22
43.62

34.54
38.52
40.98
42.62
43.80
44.67
45.36
45.91
46.36

35.94
40.31
42.99
44.80
46.10
47.08
47.85
48.46
48.97

37.23
41.99
44.86
46.85
48.28
49.36
50.21
50.89
51.45

1.0
2.0
3.0
4.0
2-Row
5.0
Capacity
6.0
MBH
7.0
8.0
9.0
10.0

0.35
1.28
2.74
4.72
7.20
10.18
13.64
17.59
22.03
26.94

15.08
15.36
15.50
15.59
15.64
15.68
15.71
15.74
15.76

25.87
27.00
27.57
27.92
28.15
28.31
28.44
28.54
28.62

33.70
35.94
37.11
37.83
38.31
38.66
38.93
39.13
39.30

39.58
42.99
44.82
45.97
46.74
47.31
47.74
48.08
48.35

44.13
48.69
51.20
52.78
53.87
54.67
55.28
55.76
56.15

47.77
53.40
56.57
58.59
59.99
61.02
61.81
62.44
62.95

50.73
57.36
61.15
63.60
65.32
66.58
67.55
68.32
68.95

53.20
60.74
65.13
67.99
70.00
71.49
72.64
73.55
74.30

55.29
63.66
68.60
71.85
74.15
75.86
77.19
78.24
79.10

57.08
66.21
71.68
75.30
77.87
79.80
81.29
82.48
83.45

58.63
68.46
74.42
78.39
81.23
83.36
85.01
86.33
87.42

Table 14. Heating capacity (MBh) - fan sizes 06SQ & 07SQ (I-P)

Rows

Water
Pressure
Gpm Drop (ft)

Airflow (Cfm)
900

1000 1100 1200 1300 1400 1500 1600 1700 1800 1900

1-Row
Capacity
MBH

0.5
1.0
2.0
3.0
4.0
5.0
6.0
7.0

0.11
0.36
1.24
2.57
4.32
6.49
9.04
11.99

32.17
35.12
36.78
37.86
38.61
39.17

33.60
36.76
38.60
39.79
40.63
41.25

34.93
38.31
40.32
41.63
42.55
43.23

36.17
39.77
41.95
43.38
44.38
45.13

37.34
41.16
43.51
45.05
46.14
46.95

38.43
42.50
45.01
46.66
47.83
48.70

39.47
43.81
46.44
48.21
49.46
50.40

40.45
45.07
47.82
49.70
51.04
52.04

41.38
46.27
49.14
51.14
52.56
53.62

42.27
47.42
50.42
52.53
54.04
55.16

43.12
48.53
51.68
53.88
55.47
56.66

2-Row
Capacity
MBH

1.0
2.0
3.0
4.0
5.0
6.0
7.0

0.68
2.24
4.57
7.59
11.29
15.64
20.61

51.03
56.65
59.73
61.67
63.00
63.97

53.38
59.74
63.27
65.51
67.05
68.18

55.46
62.53
66.50
69.04
70.79
72.07

57.32
65.06
69.46
72.28
74.24
75.69

58.98
67.37
72.18
75.29
77.45
79.05

60.47
69.48
74.69
78.08
80.44
82.19

61.83
71.42
77.02
80.67
83.24
85.14

63.07
73.20
79.18
83.09
85.86
87.90

64.20
74.86
81.19
85.36
88.31
90.51

65.24
76.40
83.08
87.50
90.63
92.96

66.20
77.83
84.84
89.50
92.81
95.28

Water Coil Performance Notes (I-P)
1. Fouling Factor = 0.0005.
2. The off-coil temperature of the hot water coil on parallel fan-powered units must not exceed
140°F when mounted on plenum inlet.
3. The following equations may be used in calculating Leaving AirTemperature (LAT) and Water
Temperature Difference (WTD).
MBH  921.7
LAT = EAT +  --------------------------------------


Cfm
2  MBH
WTD = EWT – LWT =  ------------------------
 Gpm 

32

VAV-PRC012-EN

Performance Data

4. Capacity based on 70°F entering air temperature and 180°F entering water temperature. Refer
to correction factors for different entering conditions.
5. For premium coils (.020” wall), water side pressure drop increases 17% and water velocity
increases 7% for fixed GPM.
Table 15. Temperature correction factors for water pressure drop (ft)
Average Water Temperature
Correction Factor

200
0.970

190
0.985

180
1.000

170
1.020

160
1.030

150
1.050

140
1.080

130
1.100

120
1.130

110
1.150

Table 16. Temperature correction factors for coil capacity (MBH)
40
0.355

Entering Water Minus Entering Air
Correction Factor

50
0.446

60
0.537

70
0.629

80
0.722

90
0.814

100
0.907

110
1.000

120
1.093

130
1.187

Table 17. Heating capacity (kW) - fan size 02SQ (SI)

Rows

L/s

Water
Pressure
Drop
(kPa)

47

71

94

118

142

165

189

212

236

260

283

1-Row
Capacity
kW

0.03
0.06
0.13
0.19
0.25
0.32

0.66
2.26
7.91
16.57
28.08
42.34

2.69
2.87
2.93
2.97
2.99

3.37
3.66
3.77
3.83
3.87

3.85
4.26
4.41
4.49
4.54

4.24
4.74
4.93
5.04
5.10

4.56
5.16
5.39
5.52
5.59

4.84
5.53
5.80
5.95
6.04

5.09
5.87
6.18
6.34
6.45

5.32
6.18
6.52
6.71
6.83

5.55
6.47
6.85
7.06
7.19

5.76
6.75
7.16
7.39
7.53

5.76
6.75
7.16
7.39
7.53

2-Row
Capacity
kW

0.06
0.13
0.19
0.25
0.32

3.89
13.19
27.13
45.38
67.73

2.92
3.02
3.05
3.06
3.07

4.05
4.27
4.35
4.38
4.40

5.00
5.39
5.52
5.58
5.62

5.80
6.38
6.58
6.68
6.74

6.49
7.27
7.55
7.69
7.77

7.07
8.08
8.43
8.62
8.73

7.58
8.80
9.24
9.47
9.61

8.02
9.46
9.99
10.27
10.44

8.40
10.06
10.68
11.01
11.21

8.74
10.60
11.32
11.70
11.93

8.74
10.60
11.32
11.70
11.93

Airflow (L/s)

Table 18. Heating capacity (kW) - fan sizes 03SQ–05SQ (SI)

VAV-PRC012-EN

Rows

L/s

Water
Pressure
Drop (kPa)

71

142

212

283

354

425

495

566

637

708

779

1-Row
Capacity
kW

0.06
0.13
0.19
0.25
0.32
0.38
0.44
0.50
0.57
0.63

0.82
3.06
6.63
11.51
17.68
25.13
33.83
43.79
55.00
67.45

3.85
3.99
4.07
4.11
4.15
4.17
4.19
4.20
4.21

5.46
5.77
5.94
6.05
6.12
6.18
6.22
6.25
6.28

6.51
6.97
7.22
7.39
7.50
7.58
7.65
7.70
7.74

7.33
7.93
8.27
8.48
8.64
8.75
8.83
8.90
8.96

8.02
8.75
9.17
9.44
9.63
9.77
9.88
9.97
10.04

8.62
9.48
9.97
10.30
10.53
10.70
10.83
10.93
11.02

9.17
10.14
10.71
11.08
11.35
11.55
11.71
11.83
11.93

9.67
10.74
11.38
11.81
12.12
12.35
12.52
12.67
12.78

10.12
11.29
12.01
12.49
12.84
13.09
13.29
13.46
13.59

10.53
11.81
12.60
13.13
13.51
13.80
14.02
14.20
14.35

10.53
11.81
12.60
13.13
13.51
13.80
14.02
14.20
14.35

2-Row
Capacity
kW

0.06
0.13
0.19
0.25
0.32
0.38
0.44
0.50
0.57
0.63

1.06
3.83
8.20
14.11
21.52
30.42
40.78
52.59
65.84
80.52

4.42
4.50
4.54
4.57
4.58
4.60
4.61
4.61
4.62

7.58
7.91
8.08
8.18
8.25
8.30
8.33
8.36
8.39

9.88
10.53
10.88
11.09
11.23
11.33
11.41
11.47
11.52

11.60
12.60
13.14
13.47
13.70
13.87
13.99
14.09
14.17

12.93
14.27
15.01
15.47
15.79
16.02
16.20
16.34
16.45

14.00
15.65
16.58
17.17
17.58
17.88
18.12
18.30
18.45

14.87
16.81
17.92
18.64
19.14
19.51
19.80
20.02
20.21

15.59
17.80
19.09
19.92
20.51
20.95
21.29
21.56
21.77

16.20
18.66
20.11
21.06
21.73
22.23
22.62
22.93
23.18

16.73
19.40
21.01
22.07
22.82
23.39
23.82
24.17
24.46

16.73
19.40
21.01
22.07
22.82
23.39
23.82
24.17
24.46

Airflow (L/s)

33

Performance Data

Table 19. Heating capacity (kW) - fan sizes 06SQ & 07SQ (SI)
Water
Pressure
Drop
(kPa)

425

472

519

566

613

661

708

755

802

849

897

0.03
0.06
0.13
1-Row
0.19
Capacity
0.25
kW
0.32
0.38
0.44

0.33
1.09
3.71
7.68
12.92
19.39
27.04
35.84

9.43
10.29
10.78
11.10
11.32
11.48

9.85
10.77
11.31
11.66
11.91
12.09

10.24
11.23
11.82
12.20
12.47
12.67

10.60
11.66
12.30
12.71
13.01
13.23

10.94
12.06
12.75
13.20
13.52
13.76

11.26
12.46
13.19
13.67
14.02
14.27

11.57
12.84
13.61
14.13
14.50
14.77

11.86
13.21
14.01
14.57
14.96
15.25

12.13
13.56
14.40
14.99
15.40
15.72

12.39
13.90
14.78
15.40
15.84
16.17

12.39
13.90
14.78
15.40
15.84
16.17

0.06
0.13
2-Row 0.19
Capacity 0.25
kW
0.32
0.38
0.44

2.02
6.70
13.65
22.70
33.76
46.74
61.61

14.96
16.60
17.51
18.07
18.46
18.75

15.64
17.51
18.54
19.20
19.65
19.98

16.25
18.33
19.49
20.23
20.75
21.12

16.80
19.07
20.36
21.18
21.76
22.18

17.28
19.74
21.15
22.06
22.70
23.17

17.72
20.36
21.89
22.88
23.58
24.09

18.12
20.93
22.57
23.64
24.39
24.95

18.48
21.45
23.20
24.35
25.16
25.76

18.82
21.94
23.80
25.02
25.88
26.52

19.12
22.39
24.35
25.64
26.56
27.24

19.12
22.39
24.35
25.64
26.56
27.24

Rows

L/s

Airflow (L/s)

Water Coil Performance Notes (SI)
1. Fouling Factor = 0.0005.
2. The off-coil temperature of the hot water coil on parallel fan-powered units must not exceed
60°C when mounted on plenum inlet.
3. The following equations may be used in calculating Leaving AirTemperature (LAT) and Water
Temperature Difference (WTD).
kW  0.83
LAT = EAT +  -----------------------------


Ls

WTD=EWT-LWT=kW/(4.19) L/s
4. Capacity based on 21°C entering air temperature and 82°C entering water temperature. Refer
to correction factors for different entering conditions.
5. For premium coils (.020” wall), water side pressure drop increases 17% and water velocity
increases 7% for fixed GPM.
Table 20. Temperature correction factors for water pressure drop (kPa)
Average Water Temperature
Correction Factor

93
0.970

88
0.985

82
1.000

77
1.020

71
1.030

66
1.050

60
1.080

54
1.100

49
1.130

43
1.150

Table 21. Temperature correction factors for coil capacity (kW)
Entering Water Minus Entering Air
Correction Factor

34

22
0.355

27
0.446

33
0.537

38
0.629

44
0.722

50
55
0.814 0.907

61
67
72
1.000 1.093 1.187

VAV-PRC012-EN

Performance Data

Series Fan-Powered Terminal Units
Table 22. Primary airflow control factory settings – I-P
Control Type

Direct Digital
Control/UCM

Pneumatic with
Volume Regulator

Air Valve Size
(in.)

Maximum
Valve Cfm

Maximum
Controller Cfm

Minimum
Controller Cfm

Constant
Volume Cfm

4
5
6
8

225
350
500
900

25-225
40-350
60-500
105-900

0, 25-225
0, 40-350
0, 60-500
0, 105-900

25-225
40-350
60-500
105-900

10
12
14
16

1400
2000
3000
4000

165-1400
240-2000
320-3000
420-4000

4
5
6
8

225
350
500
900

38-225
63-350
73-500
134-900

10
12
14
16

1400
2000
2885
3785

215-1400
300-2000
408-2887
536-3789

0,
0,
0,
0,

165-1400
240-2000
320-3000
420-4000

0, 38-225
0, 63-350
0, 73-500
0, 134-900
0,
0,
0,
0,

215-1400
300-2000
408-2887
536-3789

165-1400
240-2000
320-3000
420-4000
38-225
63-350
73-500
134-900
215-1400
300-2000
408-2887
536-3789

Note: Maximum airflow must be greater than or equal to minimum airflow.

Table 23. Primary airflow control factory settings – SI
Control Type

Direct Digital
Control/UCM

Pneumatic with
Volume
Regulator

Air Valve Size
(in.)

Maximum
Valve L/s

Maximum
Controller L/s

4
5
6
8

106
165
236
425

12-106
19-165
28-236
50-425

10
12
14
16

661
944
1416
1888

77-661
111-944
151-1416
198-1888

4
5
6
8

106
165
236
425

18-106
30-165
35-236
63-425

10
12
14
16

661
944
1362
1787

102-661
141-944
193-1363
253-1788

Minimum
Controller L/s
0,
0,
0,
0,

12-106
19-165
28-236
50-425

0, 77-661
0, 111-944
0, 151-1416
0, 198-1888
0,
0,
0,
0,

18-106
30-165
35-236
63-425

0, 102-661
0, 141-944
0, 193-1363
0, 253-1788

Constant
Volume L/s
12-106
19-165
28-236
50-425
77-661
111-944
151-1416
198-1888
18-106
30-165
35-236
63-425
102-661
141-944
193-1363
253-1788

Note: Maximum airflow must be greater than or equal to minimum airflow.

VAV-PRC012-EN

35

Performance Data

Table 24. Unit air pressure drop – in. wg (I-P)
Fan/Inlet Size

Airflow Cfm

Unit

2SQ-04

200
225

0.03
0.03

2SQ-05

200
250
300
350

0.03
0.04
0.06
0.09

2SQ-06

200
300
400
500

0.03
0.06
0.12
0.19

200
400
550
700

0.01
0.05
0.10
0.16

200
400
550
700

0.01
0.02
0.06
0.11

250
300
400
500

0.10
0.15
0.34
0.45

250
500
700
900

0.05
0.16
0.31
0.49

250
550
850
1200

0.03
0.11
0.24
0.44

250
550
850
1200

0.01
0.07
0.16
0.32

330
400
450
500

0.16
0.29
0.35
0.48

2SQ-08

2SQ-10

03SQ-06

03SQ-08

03SQ-10

03SQ-12

04SQ-06

Fan/Inlet Size

Airflow Cfm

Unit

04SQ-12

330
750
1150
1550

0.02
0.11
0.28
0.51

04SQ-14

330
750
1150
1550

0.02
0.11
0.26
0.48

05SQ-10

400
750
1100
1400

0.01
0.08
0.22
0.39

05SQ-12

400
900
1400
1900

0.01
0.09
0.28
0.58

05SQ-14

400
900
1400
1900

0.01
0.09
0.26
0.53

6SQ-10

700
950
1200
1400

0.01
0.03
0.12
0.22

6SQ-12

700
1150
1600
2000

0.01
0.01
0.12
0.27

6SQ-14

700
1350
2000
2600

0.01
0.04
0.19
0.41

6SQ-16

700
1350
2000
2600

0.01
0.04
0.19
0.41

7SQ-10

850
1000
1200
1400

0.01
0.05
0.12
0.22

Note: Unit pressure drops do not include hot water coil or attenuator pressure drops.

36

VAV-PRC012-EN

Performance Data

Table 24. Unit air pressure drop – in. wg (I-P) (continued)
Fan/Inlet Size

Airflow Cfm

Unit

04SQ-08

330
500
700
900

0.04
0.12
0.25
0.44

04SQ-10

330
700
1050
1400

0.02
0.12
0.29
0.54

Fan/Inlet Size

Airflow Cfm

Unit

7SQ-12

850
1200
1600
2000

0.01
0.02
0.12
0.27

7SQ-14

850
1550
2250
3000

0.01
0.07
0.27
0.59

7SQ-16

850
1550
2250
3000

0.01
0.07
0.27
0.59

Note: Unit pressure drops do not include hot water coil or attenuator pressure drops.

Table 25. Coil air pressure drop – in. wg (I-P)
Fan
Size

Airflow 1-Row HW
Cfm
(in. wg)

2-Row HW
(in. wg)

02SQ

200
300
400
500
600

0.01
0.02
0.04
0.06
0.08

0.03
0.05
0.08
0.11
0.15

03SQ
04SQ

250
500
750
1000
1250
1500

0.01
0.02
0.05
0.08
0.12
0.16

0.02
0.05
0.10
0.15
0.22
0.30

1-Row HW
(in. wg)

2-Row HW
(in. wg)

05SQ

400
700
1000
1250
1500
1750

0.01
0.04
0.07
0.10
0.14
0.19

0.03
0.08
0.13
0.19
0.26
0.34

06SQ
07SQ

600
1000
1500
2000
2500
3000

0.02
0.04
0.08
0.13
0.19
0.27

0.04
0.08
0.15
0.23
0.34
0.47

Fan Size Airflow Cfm

Note: HW Coil Only pressure drops do not include unit pressure drop.

Table 26. Attenuator air pressure drop (I-P)
Fan Size

Plenum Cfm

Attenuator

02SQ

50
150
350
550
750
950

0.00
0.00
0.02
0.05
0.10
0.16

03SQ

50
250
500
750
1000
1200

0.00
0.00
0.02
0.06
0.13
0.21

04SQ

50
300
600
900
1200
1500

0.00
0.02
0.07
0.14
0.24
0.35

Fan Size

Plenum Cfm

Attenuator

05SQ

50
300
650
1000
1300
1650

0.00
0.01
0.05
0.14
0.28
0.52

06SQ

50
500
900
1300
1700
2100

0.00
0.00
0.02
0.07
0.17
0.36

07SQ

50
800
1200
1600
2000
2400

0.00
0.01
0.05
0.14
0.30
0.58

Note: Plenum cfm = (Fan cfm) – (Min. valve cfm)

VAV-PRC012-EN

37

Performance Data

Table 27. Attenuator air pressure drop (SI)
Fan Size

Plenum L/s

Attenuator

02SQ

24
71
165
260
354
448

0
1
4
12
24
40

03SQ

24
118
236
354
472
566

0
1
5
15
32
52

04SQ

24
142
283
425
566
708

0
5
18
36
59
88

Fan Size

Plenum L/s

Attenuator

05SQ

24
142
307
472
613
779

0
2
12
36
70
129

06SQ

24
236
425
613
802
991

0
1
4
16
42
90

07SQ

24
378
566
755
944
1133

0
3
12
34
75
144

Note: Plenum cfm = (Fan cfm) – (Min. valve cfm)

Table 28. Coil air pressure drop – Pa (SI)
Fan
Size

Airflow
L/s

1-Row HW
(Pa)

2-Row HW
(Pa)

02SQ

250
400
500
600
700

3
6
10
14
20

7
12
19
28
38

03SQ
04SQ

118
236
354
472
590
708

2
6
12
19
29
40

5
13
24
38
55
75

Fan Size

Airflow L/ 1-Row HW
s
(Pa)

2-Row HW
(Pa)

05SQ

189
330
472
590
708
826

4
9
17
25
35
47

8
19
33
48
65
85

06SQ
07SQ

850
1300
1700
2150
2550
3000

4
9
19
31
47
66

9
19
36
58
85
117

Note: HW coil only pressure drops do not include unit pressure drop.

38

VAV-PRC012-EN

Performance Data

Table 29. Unit air pressure drop-Pa (SI)
Fan/Inlet Size

Airflow Cfm

Unit

2SQ-04

94
106

7
9

2SQ-05

94
118
142
165

7
11
16
22

2SQ-06

94
142
189
236

7
16
29
46

2SQ-08

94
189
260
330

2
12
24
39

2SQ-10

94
189
260
330

2
5
14
39

118
142
189
236

25
38
85
112

03SQ-08

118
236
330
425

12
41
76
123

03SQ-10

118
260
401
566

8
28
59
110

03SQ-12

118
260
401
566

4
17
40
79

04SQ-06

156
189
212
236

40
73
88
119

04SQ-08

156
236
330
425

10
29
63
109

156
330
495
661

5
30
73
135

156
354
543
731

5
28
69
127

03SQ-06

04SQ-10

04SQ-12

Fan/Inlet Size

Airflow Cfm

Unit

04SQ-14

156
354
543
731

5
27
65
120

05SQ-10

189
354
519
661

1
20
55
98

05SQ-12

189
425
661
897

2
23
71
144

05SQ-14

189
425
661
897

2
21
65
131

6SQ-10

330
448
566
661

2
8
31
55

6SQ-12

330
543
755
944

2
3
31
68

6SQ-14

330
637
944
1227

2
9
47
101

6SQ-16

330
637
944
1227

2
9
47
101

7SQ-10

401
472
566
661

2
12

7SQ-12

401
566
755
944

2
5
31
68

7SQ-14

401
731
1062
1416

2
18
67
147

7SQ-16

401
731
1062
1416

2
18
67
147

55

Note: Unit pressure drops do not include hot water coil or attenuator pressure drops.

VAV-PRC012-EN

39

Series 02SQ—PSC

Pa

In. wg

150

0.60

125

0.50

100

0.40

75

0.30

50

0.20

25

0.10

0

0.00
100

190 cfm min
(90 L/s)

Discharge Static Pressure

Performance Data

200

300

400

500

600

700

800

Cfm

94

142

189

236

283

330

378

L/s

47

Airflow

1-row coil maximum
2-row coil maximum
Note: When attenuator is required, add inlet
attenuator pressure to discharge static
pressure for final fan performance.

In. wg
0.80

174

0.70

150

0.60

125

0.50

100

0.40

75

0.30

50

0.20

25

0.10

0

0.00

Series 03SQ—PSC

250 cfm min
(118 L/s)

Minimum

Discharge Static Pressure

VSCF and VSEF maximum

Pa
199

200

300

400

500

600

700

800

900

1000

1100

1200

1300

1400 Cfm

94

142

189

236

283

330

378

425

472

519

566

614

661 L/s

Airflow

Series 04SQ—PSC

0.80

174

0.70

150

0.60

125

0.50

100

0.40

75

0.30

50

0.20

25

0.10

0

0.00

330 cfm min
(156 L/s)

Discharge Static Pressure

Pa In. wg
199

300

400

500

600

700

800

900

1000

1100

1200

1300

1400

1500

1600

1700 Cfm

142

189

236

283

330

378

425

472

519

566

614

661

708

755

802 L/s

Airflow

40

VAV-PRC012-EN

Performance Data

Series 05SQ—PSC

In. wg
0.80

174

0.70

150

0.60

125

0.50

100

0.40

75

0.30

50

0.20

25

0.10

0

0.00

400 cfm min
(189 L/s)

Discharge Static Pressure

Pa
199

300

500

700

900

1100

1300

1500

1700

1900

2100 Cfm

142

236

330

425

519

614

708

802

897

991 L/s

Airflow

1-row coil maximum
2-row coil maximum
Note: When attenuator is required, add inlet
attenuator pressure to discharge static
pressure for final fan performance.

In. wg
0.80

174

0.70

150

0.60

125

0.50

100

0.40

75

0.30

50

0.20

25

0.10

0

Series 06SQ—PSC

700 cfm min
(330 L/s)

Minimum

Discharge Static Pressure

VSCF and VSEF maximum

Pa
199

0.00
400

600

800

1000

1200

1400

1600

1800

2000

2200

2400

2600

2800

Cfm

189

283

378

472

566

661

755

850

944

1038

1133

1227

1322

L/s

Pa
199

In. wg
0.80

174

0.70

150

0.60

125

0.50

100

0.40

75

0.30

50

0.20

25

0.10

0

0.00
800
378

Series 07SQ—PSC

850 cfm min
(401 L/s)

Discharge Static Pressure

Airflow

1000

1200

1400

1600

1800

2000

2200

2400

2600

2800

3000

3200

3400 Cfm

472

566

661

755

850

944

1038

1133

1227

1322

1416

1510

1605

L/s

Airflow

VAV-PRC012-EN

41

Pa

In. wg

125

0.50

100

0.40

75

0.30

50

0.20

25

0.10

0

VSxF Size 03SQ—ECM

200 cfm min
(94 L/s)

Discharge Static Pressure

Performance Data

0.00
100

200

300

400

500

600

700

800

900

1000

1100

1200 Cfm

47

94

142

189

236

283

330

378

425

472

519

566 L/s

Airflow

1-row coil maximum
2-row coil maximum

Notes:
1. ECMs (Electrically Commutated Motors) are
ideal for systems seeking maximum motor
efficiency.
2. When attenuator is required, add inlet
attenuator pressure to discharge static
pressure for final fan performance.

In. wg
0.50

100

0.40

75

0.30

50

0.20

25

0.10

VSxF 04SQ—ECM

240 cfm min
(113 L/s)

Minimum

Discharge Static Pressure

VSCF and VSEF maximum

Pa
125

0.00
200

0

94

400

600

800

1000

1200

1400

1600 Cfm

189

283

378

472

566

661

755 L/s

Pa

In. wg

125

0.50

100

0.40

75

0.30

50

0.20

25

0.10

0

VSxF 05SQ—ECM

350 cfm min
(165 L/s)

Discharge Static Pressure

Airflow

0.00
300

500

700

900

1100

1300

1500

1700

1900

2100 Cfm

142

236

330

425

519

614

708

802

897

991 L/s

Airflow

42

VAV-PRC012-EN

Performance Data

100

0.40

Minimum
1-row coil maximum

75

0.30

2-row coil maximum
Notes:
1. ECMs (Electrically Commutated Motors) are
ideal for systems seeking maximum motor
efficiency.
2. When attenuator is required, add inlet
attenuator pressure to discharge static
pressure for final fan performance.

50

0.20

25

0.10

0

VSxF 06SQ—ECM

700 cfm min
(330 L/s)

In. wg
0.50

Discharge Static Pressure

VSCF and VSEF maximum

Pa
125

0.00
600

800

1,000

1,200

1,400

1,600

1,800

2,000

2,200

2,400

2,600 Cfm

283

378

472

566

661

755

850

944

1038

1133

1227

L/s

Airflow

Table 30. Heating capacity (MBh) - fan size 02SQ (I-P)

Rows

Gpm

Water
Pressure
Drop (ft)

150

200

250

300

350

400

450

500

550

600

700

1-Row
Capacity
MBH

0.50
1.0
2.0
3.0
4.0
5.0

0.16
0.53
1.85
3.85
6.51
9.79

9.14
9.94
10.25
10.41
10.51

10.34
11.40
11.80
12.02
12.15

11.34
12.63
13.14
13.41
13.58

12.20
13.73
14.34
14.66
14.87

12.97
14.73
15.43
15.81
16.05

13.67
15.66
16.45
16.89
17.17

14.32
16.52
17.41
17.90
18.21

14.93
17.33
18.32
18.87
19.21

15.51
18.10
19.18
19.78
20.17

16.05
18.82
20.01
20.66
21.08

17.02
20.18
21.56
22.32
22.81

2-Row
Capacity
MBH

1.0
2.0
3.0
4.0
5.0

1.00
3.42
7.05
11.82
17.68

12.59
13.42
13.71
13.86
13.94

15.23
16.60
17.08
17.33
17.48

17.40
19.34
20.04
20.40
20.62

19.21
21.73
22.66
23.14
23.44

20.74
23.84
25.00
25.62
25.99

22.06
25.71
27.12
27.86
28.32

23.19
27.39
29.03
29.90
30.44

24.19
28.90
30.77
31.77
32.40

25.07
30.27
32.37
33.50
34.21

25.85
31.52
33.84
35.10
35.89

27.19
33.72
36.46
37.96
38.92

Airflow (Cfm)

Table 31. Heating capacity (MBh) - fan sizes 03SQ 04SQ (I-P)

Rows

Gpm

Water
Pressure
Drop (ft)

200

300

400

550

700

850

1000

1150

1300

1450

1600

1-Row
Capacity
MBH

1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0

0.27
1.01
2.19
3.81
5.85
8.32
11.20
14.50
18.22
22.35

15.03
15.70
16.06
16.29
16.45
16.56
16.65
16.72
16.78

18.19
19.23
19.80
20.16
20.41
20.59
20.73
20.84
20.93

20.63
22.00
22.76
23.24
23.58
23.82
24.01
24.17
24.29

23.57
25.41
26.44
27.11
27.57
27.91
28.18
28.39
28.56

26.00
28.29
29.59
30.43
31.02
31.46
31.80
32.08
32.30

28.09
30.81
32.38
33.40
34.12
34.66
35.07
35.41
35.68

29.99
33.08
34.91
36.11
36.96
37.59
38.08
38.48
38.80

31.71
35.15
37.23
38.60
39.58
40.31
40.88
41.34
41.71

33.27
37.05
39.38
40.93
42.03
42.86
43.51
44.03
44.46

34.68
38.83
41.38
43.10
44.34
45.26
45.99
46.57
47.05

35.97
40.51
43.26
45.15
46.51
47.54
48.34
48.99
49.52

2-Row
Capacity
MBH

1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0

0.39
1.41
3.01
5.16
7.84
11.06
14.81
19.07

18.93
19.46
19.72
19.88
19.98
20.06
20.12

25.58
26.72
27.30
27.65
27.88
28.05
28.18

30.93
32.79
33.75
34.34
34.74
35.02
35.24

37.20
40.20
41.80
42.79
43.47
43.96
44.34

41.99
46.12
48.38
49.81
50.79
51.50
52.05

45.78
50.97
53.88
55.73
57.01
57.96
58.68

48.85
55.02
58.54
60.81
62.40
63.57
64.46

51.38
58.45
62.56
65.23
67.10
68.49
69.57

53.52
61.41
66.05
69.11
71.26
72.87
74.11

55.34
63.98
69.14
72.55
74.98
76.79
78.19

56.92
66.24
71.88
75.63
78.31
80.32
81.88

VAV-PRC012-EN

Airflow (Cfm)

43

Performance Data

Table 32. Heating capacity (MBh) - fan size 05SQ (I-P)

Rows

Gpm

Water
Pressure
Drop (ft)

350

500

650

800

1000

1200

1400

1600

1800

2000

2150

1-Row
Capacity
MBH

1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0

0.29
1.08
2.33
4.03
6.18
8.76
11.79
15.24

21.67
23.02
23.76
24.23
24.55
24.79
24.97

25.25
27.14
28.20
28.87
29.34
29.69
29.95

28.09
30.49
31.85
32.72
33.34
33.79
34.14

30.49
33.38
35.03
36.10
36.86
37.42
37.85

33.30
36.75
38.78
40.11
41.05
41.75
42.29

35.79
39.71
42.12
43.71
44.83
45.67
46.33

37.96
42.39
45.14
46.98
48.29
49.28
50.05

39.88
44.89
47.92
50.01
51.50
52.63
53.51

41.61
47.17
50.48
52.81
54.50
55.76
56.76

43.17
49.26
52.91
55.44
57.30
58.71
59.82

44.25
50.73
54.64
57.30
59.30
60.82
62.01

2-Row
Capacity
MBH

1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0

0.39
1.39
2.96
5.08
7.72
10.90
14.59
18.79

29.95
31.40
32.14
32.58
32.87
33.08
33.24

37.69
40.36
41.74
42.59
43.16
43.57
43.88

43.62
47.58
49.69
51.00
51.88
52.53
53.02

48.30
53.51
56.37
58.16
59.39
60.28
60.96

53.17
59.95
63.77
66.21
67.90
69.14
70.09

56.95
65.16
69.90
72.97
75.11
76.69
77.91

59.97
69.45
75.05
78.72
81.30
83.22
84.70

62.43
73.07
79.45
83.68
86.69
88.93
90.66

64.49
76.15
83.26
88.02
91.42
93.97
95.95

66.24
78.82
86.60
91.85
95.63
98.47
100.69

67.38
80.59
88.84
94.45
98.49
101.54
103.93

Airflow (Cfm)

Table 33. Heating capacity (MBh) - fan size 06SQ & 07SQ (I-P)

Rows

Gpm

Water
Pressure
Drop (ft)

700

900

1100

1300

1500

1700

1900

2100

2300

2500

2700

1-Row
Capacity
MBH

0.5
1.0
2.0
3.0
4.0
5.0
6.0

0.12
0.40
1.37
2.83
4.76
7.13
9.93

31.21
33.81
35.27
36.20
36.85

34.50
37.76
39.61
40.80
41.64

37.47
41.19
43.42
44.87
45.90

40.06
44.25
46.86
48.57
49.78

42.33
47.10
50.00
51.97
53.36

44.37
49.74
52.91
55.12
56.70

46.21
52.17
55.63
58.07
59.83

47.89
54.40
58.24
60.84
62.79

49.43
56.49
60.68
63.46
65.59

50.85
58.43
62.97
66.00
68.24

52.16
60.24
65.14
68.41
70.77

2-Row
Capacity
MBH

1.0
2.0
3.0
4.0
5.0
6.0

0.77
2.58
5.27
8.78
13.07
18.13

47.79
52.10
54.37
55.77
56.71

54.01
60.08
63.38
65.44
66.85

58.79
66.51
70.82
73.55
75.43

62.56
71.79
77.06
80.45
82.80

65.61
76.21
82.39
86.40
89.22

68.13
79.96
86.98
91.60
94.86

70.25
83.19
91.00
96.18
99.86

72.05
86.00
94.54
100.26
104.34

73.60
88.47
97.69
103.91
108.37

74.95
90.65
100.51
107.20
112.03

76.14
92.61
103.06
110.19
115.36

Airflow (Cfm)

Water Coil Notes (I-P)
1. Fouling Factor = 0.0005.
2. The following equations may be used in calculating Leaving AirTemperature (LAT) and Water
Temperature Difference (WTD):
MBHx921.7
LAT = EAT +  ------------------------------------


Cfm
2  MBH
WTD = EWT – LWT =  ------------------------
 Gpm 

3. Capacity based on 70°F entering air temperature and 180°F entering water temperature. Refer
to correction factors for different entering conditions.
Table 34. Temperature correction factors for water pressure drop (ft)
Average Water Temperature
Correction Factor

44

200
0.970

190
0.985

180
1.000

170
1.020

160
1.030

150
1.050

140
1.080

130
1.100

120
1.130

110
1.150

VAV-PRC012-EN

Performance Data

Table 35. Temperature correction factors for coil capacity (MBH)
Entering Water Minus Entering Air
Correction Factor

40
50
60
70
80
90
0.355 0.446 0.537 0.629 0.722 0.814

100
0.907

110
120
1.000 1.093

130
1.187

Table 36. Heating capacity (kW) - fan size 02SQ (SI)

Rows

L/s

Water
Pressure
Drop (kPa)

71

94

118

142

165

189

212

236

260

283

330

1-Row
Capacity kW

0.03
0.06
0.13
0.19
0.25
0.32

0.47
1.59
5.52
11.51
19.45
29.27

2.68
2.91
3.00
3.05
3.08

3.03
3.34
3.46
3.52
3.56

3.32
3.70
3.85
3.93
3.98

3.58
4.02
4.20
4.30
4.36

3.80
4.32
4.52
4.63
4.71

4.01
4.59
4.82
4.95
5.03

4.20
4.84
5.10
5.25
5.34

4.38
5.08
5.37
5.53
5.63

4.55
5.30
5.62
5.80
5.91

4.70
5.52
5.86
6.06
6.18

4.70
5.52
5.86
6.06
6.18

2-Row
Capacity kW

0.06
0.13
0.19
0.25
0.32

3.00
10.21
21.07
35.33
52.84

3.69
3.93
4.02
4.06
4.09

4.46
4.86
5.01
5.08
5.12

5.10
5.67
5.87
5.98
6.04

5.63
6.37
6.64
6.78
6.87

6.08
6.99
7.33
7.51
7.62

6.46
7.54
7.95
8.16
8.30

6.80
8.03
8.51
8.76
8.92

7.09
8.47
9.02
9.31
9.50

7.35
8.87
9.49
9.82
10.03

7.58
9.24
9.92
10.29
10.52

7.58
9.24
9.92
10.29
10.52

Airflow (L/s)

Table 37. Heating capacity (kW) - fan sizes 03SQ 04SQ(SI)

Rows

L/s

Water
Pressure
Drop (kPa)

94

142

189

260

330

401

472

543

613

684

755

1-Row
Capacity kW

0.06
0.13
0.19
0.25
0.32
0.38
0.44
0.50
0.57
0.63

0.81
3.02
6.56
11.39
17.49
24.86
33.49
43.36
54.46
66.80

4.40
4.60
4.71
4.77
4.82
4.85
4.88
4.90
4.92

5.33
5.64
5.80
5.91
5.98
6.03
6.08
6.11
6.13

6.04
6.45
6.67
6.81
6.91
6.98
7.04
7.08
7.12

6.91
7.45
7.75
7.94
8.08
8.18
8.26
8.32
8.37

7.62
8.29
8.67
8.92
9.09
9.22
9.32
9.40
9.47

8.23
9.03
9.49
9.79
10.00
10.16
10.28
10.38
10.46

8.79
9.70
10.23
10.58
10.83
11.02
11.16
11.28
11.37

9.29
10.30
10.91
11.31
11.60
11.81
11.98
12.12
12.22

9.75
10.86
11.54
11.99
12.32
12.56
12.75
12.90
13.03

10.16
11.38
12.13
12.63
12.99
13.27
13.48
13.65
13.79

10.16
11.38
12.13
12.63
12.99
13.27
13.48
13.65
13.79

2-Row
Capacity kW

0.06
0.13
0.19
0.25
0.32
0.38
0.44
0.50

1.18
4.22
8.99
15.41
23.45
33.07
44.26
57.00

5.55
5.70
5.78
5.83
5.86
5.88
5.90

7.50
7.83
8.00
8.10
8.17
8.22
8.26

9.07
9.61
9.89
10.06
10.18
10.26
10.33

10.90
11.78
12.25
12.54
12.74
12.88
12.99

12.31
13.52
14.18
14.60
14.88
15.09
15.25

13.42
14.94
15.79
16.33
16.71
16.99
17.20

14.32
16.12
17.16
17.82
18.29
18.63
18.89

15.06
17.13
18.33
19.12
19.67
20.07
20.39

15.68
18.00
19.36
20.25
20.89
21.36
21.72

16.22
18.75
20.26
21.26
21.97
22.50
22.92

16.22
18.75
20.26
21.26
21.97
22.50
22.92

VAV-PRC012-EN

Airflow (L/s)

45

Performance Data

Table 38. Heating capacity (kW) - fan size 05SQ(SI)

Rows

L/s

Water
Pressure
Drop (kPa)

165

236

307

378

472

566

661

755

849

944

1015

1-Row
Capacity kW

0.06
0.13
0.19
0.25
0.32
0.38
0.44
0.50

0.87
3.22
6.95
12.04
18.46
26.20
35.23
45.57

6.35
6.75
6.96
7.10
7.19
7.26
7.32

7.40
7.95
8.26
8.46
8.60
8.70
8.78

8.23
8.94
9.33
9.59
9.77
9.90
10.01

8.94
9.78
10.27
10.58
10.80
10.97
11.09

9.76
10.77
11.37
11.76
12.03
12.24
12.40

10.49
11.64
12.34
12.81
13.14
13.39
13.58

11.12
12.42
13.23
13.77
14.15
14.44
14.67

11.69
13.16
14.04
14.66
15.09
15.42
15.68

12.19
13.82
14.79
15.48
15.97
16.34
16.63

12.65
14.44
15.51
16.25
16.79
17.21
17.53

12.65
14.44
15.51
16.25
16.79
17.21
17.53

2-Row
Capacity kW

0.06
0.13
0.19
0.25
0.32
0.38
0.44
0.50

1.16
4.16
8.85
15.17
23.09
32.57
43.60
56.16

8.78
9.20
9.42
9.55
9.63
9.70
9.74

11.05
11.83
12.23
12.48
12.65
12.77
12.86

12.78
13.94
14.56
14.95
15.21
15.39
15.54

14.16
15.68
16.52
17.04
17.40
17.67
17.87

15.58
17.57
18.69
19.41
19.90
20.26
20.54

16.69
19.10
20.48
21.38
22.01
22.48
22.83

17.57
20.35
21.99
23.07
23.83
24.39
24.82

18.30
21.41
23.28
24.52
25.41
26.06
26.57

18.90
22.32
24.40
25.80
26.79
27.54
28.12

19.41
23.10
25.38
26.92
28.03
28.86
29.51

19.41
23.10
25.38
26.92
28.03
28.86
29.51

Airflow (L/s)

Table 39. Heating capacity (kW) - fan sizes 06SQ & 07SQ (SI)

Rows

L/s

Water
Pressure
Drop (kPa)

330

425

519

613

708

802

897

991

1085

1180

1274

1-Row
Capacity kW

0.03
0.06
0.13
0.19
0.25
0.32
0.38

0.36
1.20
4.10
8.46
14.22
21.30
29.68

9.15
9.91
10.34
10.61
10.80

10.11
11.07
11.61
11.96
12.20

10.98
12.07
12.73
13.15
13.45

11.74
12.97
13.73
14.23
14.59

12.41
13.80
14.66
15.23
15.64

13.00
14.58
15.51
16.15
16.62

13.54
15.29
16.30
17.02
17.54

14.03
15.94
17.07
17.83
18.40

14.49
16.55
17.78
18.60
19.22

14.90
17.12
18.46
19.34
20.00

14.90
17.12
18.46
19.34
20.00

2-Row
Capacity kW

0.06
0.13
0.19
0.25
0.32
0.38

2.31
7.71
15.74
26.24
39.08
54.19

14.01
15.27
15.94
16.34
16.62

15.83
17.61
18.58
19.18
19.59

17.23
19.49
20.75
21.55
22.11

18.33
21.04
22.58
23.58
24.27

19.23
22.33
24.14
25.32
26.15

19.97
23.43
25.49
26.85
27.80

20.59
24.38
26.67
28.19
29.27

21.11
25.20
27.71
29.38
30.58

21.57
25.93
28.63
30.45
31.76

21.97
26.57
29.46
31.42
32.83

21.97
26.57
29.46
31.42
32.83

Airflow (L/s)

Water Coil Notes (SI)
1. Fouling Factor = 0.0005.
2. The following equations may be used in calculating Leaving AirTemperature (LAT) and Water
Temperature Difference (WTD).
kW  0.83
LAT = EAT +  -----------------------------


Ls
kW
WTD = EWT – LWT =  -----------------------------
 4.19  L  s 

3. Capacity based on 21°C entering air temperature and 82°Centering water temperature. Refer to
correction factors for different entering conditions.
Table 40. Temperature correction factors for water pressure drop (kPa)
Average Water Temperature
Correction Factor

93
0.970

88
0.985

82
1.000

77
1.020

71
1.030

66
1.050

60
1.080

54
1.100

49
1.130

43
1.150

67
1.093

72
1.187

Table 41. Temperature correction factors for coil capacity (kW)
Entering Water Minus Entering Air
Correction Factor

46

22
0.355

27
0.446

33
0.537

38
0.629

44
0.722

50
0.814

55
0.907

61
1.000

VAV-PRC012-EN

Performance Data

Low Height Parallel Fan-Powered Terminal Units
Table 42. Primary airflow control factory settings – I-P
Air Valve Size
(in.)

Maximum Valve
Cfm

Maximum
Controller Cfm

Minimum Controller
Cfm

Constant Volume
Cfm

Direct Digital Control/
UCM

5
6
8
8x14

350
500
900
2200

40-350
60-500
105-900
200-2200

0, 40-350
0, 60-500
0, 105-900
0, 220-2200

40-350
60-500
105-900
220-2200

Pneumatic with
Volume Regulator

5
6
8
8x14

350
500
900
2100

63-350
73-500
134-900
297-2100

0, 63-350
0, 73-500
0, 134-900
0, 297-2100

63-350
73-500
134-900
297-2100

Analog Electronic

5
6
8
8x14

350
500
900
2200

82-350
120-500
210-900
440-2200

0, 82-310
0, 120-360
0, 210-660
0, 440-1475

82-310
120-360
210-660
440-1475

Control Type

Table 43. Primary airflow control factory settings – SI
Air Valve Size
(in.)

Maximum Valve
L/s

Maximum
Controller L/s

Minimum Controller
L/s

Constant Volume
L/s

Direct Digital Control/
UCM

5
6
8
8x14

165
236
425
1038

19-165
28-236
50-425
104-1038

0, 19-165
0, 28-236
0, 50-425
0, 104-1038

19-165
28-236
50-425
104-1038

Pneumatic with Volume
Regulator

5
6
8
8x14

165
236
425
991

30-165
35-236
63-425
140-991

0, 30-165
0, 35-236
0, 63-425
0, 140-991

30-165
35-236
63-425
140-991

Analog Electronic

5
6
8
8x14

165
236
425
1038

39-165
57-236
100-425
208-1038

0, 39-146
0, 57-170
0, 100-311
0, 208-696

39-146
57-170
100-311
208-696

Control Type

Note: Maximum airflow must be greater than or equal to minimum airflow.

Table 44. Unit air pressure drop – in. wg (I-P)
Fan/Inlet Size

Airflow Cfm

Cooling Only Unit
(in. wg)

Fan/Inlet Size

Airflow Cfm

Cooling Only Unit
(in. wg)

08SQ-05

150
200
250
350

0.01
0.02
0.03
0.05

09SQ-08

400
600
800
900

0.01
0.09
0.16
0.20

08SQ-06

200
300
400
500

0.01
0.04
0.06
0.09

09SQ-8x14

700
1100
1500
1900

0.10
0.25
0.47
0.75

08SQ-08

400
600
800
900

0.01
0.09
0.16
0.20

10SQ-08

400
600
800
900

0.01
0.09
0.18
0.24

09SQ-06

200
300
400
500

0.01
0.04
0.06
0.09

10SQ-8x14

725
1000
1200
1450

0.18
0.36
0.53
0.78

Notes:
1. Units with Electric Coils per fan size add 0.01" (3 Pa) to cooling only value.
2. HW Coil only pressure drops are just for the heating coil.

VAV-PRC012-EN

47

Performance Data

Table 45. Unit air pressure drop – Pa (SI)
Inlet/Fan Size

Airflow L/s

Cooling Only
Unit (Pa)

Inlet/Fan Size

Airflow L/s

Cooling Only
Unit (Pa)

08SQ-05

71
94
118
165

2
5
7
13

09SQ-08

189
283
378
425

2
21
40
51

08SQ-06

200
142
189
236

0.01
10
16
24

09SQ-8x14

330
519
708
897

26
63
116
185

08SQ-08

189
283
378
425

2
21
40
51

10SQ-08

189
283
378
425

2
23
45
59

09SQ-06

94
142
189
236

2
10
16
24

10SQ-8x14

345
475
565
685

47
91
131
195

Notes:
1. Units with Electric Coils per fan size add 0.01" (3 Pa) to cooling only value.
2. HW Coil only pressure drops are just for the heating coil.

Table 46. Coil air pressure drop
in. wg (I-P)
Fan Size Airflow Cfm

Pa (SI)

1-Row HW
(in. wg)

2-Row HW
(in. wg)

08SQ

100
200
300
400
450

0.00
0.01
0.02
0.03
0.04

0.01
0.02
0.04
0.06
0.07

09SQ

250
400
550
700
850

0.01
0.03
0.05
0.08
0.11

0.03
0.06
0.10
0.15
0.20

10SQ

725
800
900
1000
1100
1150

0.09
0.11
0.13
0.16
0.19
0.20

0.17
0.20
0.24
0.29
0.33
0.35

Fan Size Airflow L/s

1-Row HW
(Pa)

2-Row HW (Pa)

08SQ

47
94
142
189
212

1
2
4
7
9

2
5
10
15
18

09SQ

118
189
260
330
401

3
7
12
19
27

7
15
25
36
51

10SQ

342
375
425
475
520
543

22
26
33
40
46
49

43
49
60
72
82
87

Note: HW Coil Only pressure drops do not include unit pressure drop.

Table 47. Attenuator air pressure drop
(I-P)
Plenum Cfm

Attenuator

08SQ

150
250
350
450

09SQ

350
500
650
800

10SQ

48

(SI)

Fan Size

not available

Fan Size

Plenum L/s

Attenuator

0.01
0.03
0.05
0.07

08SQ

71
118
165
212

0.01
0.01
0.02
0.02

0.05
0.08
0.13
0.18

09SQ

165
236
307
378

0.02
0.03
0.04
0.05

10SQ

not available

VAV-PRC012-EN

Performance Data

Performance Data Fan Curves

Low-Height Parallel 08SQ—PSC

125

0.50
175 cfm min
(83 L/s)

Discharge Static Pressure

Pa In. wg
150 0.60

100 0.40

75

0.30

50

0.20

25

0.10
150
71

200

250

300

350

400

450

500

550 Cfm

94

118

142

165

189

212

236

260 L/s

Airflow

Low-Height Parallel 09SQ—PSC

Pa

In. wg

199

0.80

174

0.70

150

0.60

125

0.50

100

0.40

75

0.30

50

0.20

25

0.10
400

500

600

700

800

900

189

236

273

330

378

425

Minimum
1-row coil maximum
2-row coil maximum
Notes:
1. When attenuator is required, add inlet
attenuator pressure to discharge static
pressure for final fan performance.
2. When attenuator is required, add inlet
attenuator pressure to discharge static
pressure for final fan performance.

410 cfm min
(193 L/s)

Discharge Static Pressure

LPCF and LPEF maximum

1000 Cfm
472

L/s

Airflow

Pa

Low-Height Parallel 10SQ—PSC

In. wg

199 0.80

174 0.70

Discharge Static Pressure

150 0.60

125 0.50

100 0.40
75 0.30

50 0.20

25 0.10
300

500

700

900

1100

1300

1500

Cfm

142

236

330

425

519

614

708

L/s

Airflow

VAV-PRC012-EN

49

Performance Data

LPxF 08SQ—ECM

Pa

In. wg

125

0.50

100

0.40

75

0.30

50

0.20

25

0.10
50

150

250

350

450

Cfm

24

71

118

165

212

L/s

1-row coil maximum
2-row coil maximum
Notes:
1. ECMs (Electrically Commutated Motors) are
ideal for systems seeking maximum motor
efficiency.
2. When attenuator is required, add inlet
attenuator pressure to discharge static
pressure for final fan performance.

100 cfm min
(47 L/s)

Minimum

Discharge Static Pressure

LPCF and LPEF maximum

Pa

In. wg

125

0.50

100

0.40

75

0.30

50

0.20

LPxF 09SQ—ECM

250 cfm min
(118 L/s)

Discharge Static Pressure

Airflow

25 0.10
200
94

300

400

500

600

700

800

900

1000

1100 Cfm

142

189

236

283

330

378

425

472

519 L/s

Airflow

50

VAV-PRC012-EN

Performance Data

Table 48. Heating capacity (MBh) - fan sizes 08SQ & 09SQ (I-P)

Rows

Gpm

Water
Pressure
Drop (ft)

100

200

300

400

500

600

700

800

900

1-Row
Capacity MBH

0.5
1.0
1.5
2.0
2.5

0.80
2.67
5.43
9.02
13.39

7.73
8.58
8.90
9.06
9.17

10.43
12.15
12.83
13.20
13.43

12.20
14.51
15.52
16.07
16.43

13.50
16.37
17.69
18.42
18.89

14.51
17.98
19.56
20.47
21.06

15.33
19.42
21.21
22.30
23.00

16.03
20.69
22.72
23.97
24.79

16.63
21.82
24.15
25.51
26.45

17.15
22.85
25.46
26.95
28.00

2-Row
Capacity MBH

1.0
2.0
3.0
4.0
5.0

0.89
3.02
6.24
10.47
15.66

9.36
9.74
9.86
9.92
9.96

15.49
16.83
17.29
17.53
17.67

19.69
22.20
23.11
23.59
23.88

22.72
26.42
27.82
28.56
29.01

25.00
29.83
31.72
32.73
33.36

26.79
32.65
35.02
36.29
37.10

28.23
35.03
37.85
39.39
40.36

29.41
37.06
40.32
42.11
43.24

30.41
38.83
42.49
44.52
45.81

Airflow (Cfm)

Table 49. Heating capacity (MBh) - fan size 10SQ (I-P)

Rows

Gpm

Water
Pressure
Drop (ft)

700

800

900

1000

1100

1200

1240

1-Row Capacity
MBH

0.7
1.0
1.5
2.0
2.5

1.51
2.80
5.69
9.45
14.03

18.46
20.69
22.72
23.97
24.79

19.31
21.82
24.15
25.51
26.45

20.07
22.85
25.46
26.95
28.00

20.75
23.78
26.67
28.32
29.46

21.37
24.64
27.79
29.62
30.83

21.93
25.43
28.84
30.84
32.14

22.14
25.72
29.24
31.30
32.66

2-Row Capacity
MBH

1.5
2.0
3.0
4.0
5.0

1.85
3.07
6.32
10.58
15.80

32.51
35.03
37.85
39.39
40.36

34.20
37.06
40.32
42.11
43.24

35.65
38.83
42.49
44.52
45.81

36.90
40.38
44.42
46.68
48.13

38.01
41.76
46.15
48.62
50.22

38.98
42.99
47.71
50.39
52.13

39.34
43.44
48.29
51.06
52.84

Airflow (Cfm)

Water Coil Notes (I-P)
Note: Fouling Factor = 0.0005.
Note: The off-coil temperature of the hot water coil on parallel fan-powered units must not exceed
140°F when mounted on plenum inlet.
Note: The following equations may be used in calculating Leaving AirTemperature (LAT) and
WaterTemperature Difference (WTD).
MBH  921.7
LAT = EAT +  --------------------------------------


Cfm
2  MBH
WTD = EWT – LWT =  ------------------------
 Gpm 

Note: Capacity based on 70°F entering air temperature and 180°F entering water temperature.
Refer to correction factors for different entering conditions.
Table 50.
Temperature correction factors for water pressure drop (WPD)
Average Water Temperature
Correction Factor

200

190

180

170

160

150

140

130

120

110

0.970 0.985 1.000 1.020 1.030 1.050 1.080 1.100 1.130 1.150

Temperature correction factors for coil capacity (MBH)
Entering Water Minus Entering Air
Correction Factor

VAV-PRC012-EN

40

50

60

70

80

90

100

110

120

130

0.355 0.446 0.537 0.629 0.722 0.814 0.907 1.000 1.093 1.187

51

Performance Data

Table 51. Heating capacity (kW) - fan sizes 08SQ & 09SQ (SI)
Rows

L/s

Airflow (L/s)

Water Pressure
Drop (kPa)

47

94

142

189

236

283

330

378

425

1-Row Capacity
kW

0.03
0.06
0.09
0.13
0.16

2.39
7.98
16.24
26.97
40.04

2.27
2.51
2.61
2.66
2.69

3.06
3.56
3.76
3.87
3.94

3.58
4.25
4.55
4.71
4.81

3.96
4.80
5.18
5.40
5.54

4.25
5.27
5.73
6.00
6.17

4.49
5.69
6.22
6.54
6.74

4.70
6.06
6.66
7.03
7.27

4.87
6.40
7.08
7.48
7.75

5.03
6.70
7.46
7.90
8.21

2-Row Capacity
kW

0.06
0.13
0.19
0.25
0.32

2.65
9.03
18.65
31.29
46.82

2.74
2.85
2.89
2.91
2.92

4.54
4.93
5.07
5.14
5.18

5.77
6.51
6.77
6.91
7.00

6.66
7.74
8.15
8.37
8.50

7.33
8.74
9.30
9.59
9.78

7.85
9.57
10.26
10.64
10.87

8.27
10.27
11.09
11.54
11.83

8.62
10.86
11.82
12.34
12.67

8.91
11.38
12.45
13.05
13.43

Table 52. Heating capacity (kW) - fan size 10SQ (SI)
Airflow (L/s)

Rows

L/s

Water Pressure
Drop (kPa)

330

378

425

472

519

566

585

1-Row Capacity
kW

0.04
0.06
0.09
0.13
0.16

4.51
8.37
17.02
28.25
41.94

5.41
6.06
6.66
7.03
7.27

5.66
6.40
7.08
7.48
7.75

5.88
6.70
7.46
7.90
8.21

6.08
6.97
7.81
8.30
8.63

6.26
7.22
8.14
8.68
9.03

6.43
7.45
8.45
9.04
9.42

6.49
7.54
8.57
9.17
9.57

2-Row Capacity
kW

0.09
0.13
0.19
0.25
0.32

5.53
9.19
18.89
31.61
47.22

9.53
10.27
11.09
11.54
11.83

10.02
10.86
11.82
12.34
12.67

10.45
11.38
12.45
13.05
13.43

10.82
11.84
13.02
13.68
14.10

11.14
12.24
13.52
14.25
14.72

11.42
12.60
13.98
14.77
15.28

11.53
12.73
14.15
14.96
15.49

Water Coil Notes (SI)
1. Fouling Factor = 0.0005.
2. The off-coil temperature of the hot water coil on parallel fan-powered units must not exceed
60°C when mounted on plenum inlet.
3. The following equations may be used in calculating Leaving AirTemperature (LAT) and Water
Temperature Difference (WTD).
kW  0.83
LAT = EAT +  -----------------------------


Ls
kW
WTD = EWT – LWT =  ----------------------------------
  4.19   L  s 

4. Capacity based on 21°C entering air temperature and 82°C entering water temperature. Refer
to correction factors for different entering conditions.
Table 53.
Temperature correction factors for water pressure drop (kPa)
Average Water Temperature
Correction Factor

93

88

0.970

0.985

82

77

1.000 1.020

71

66

60

1.030

1.050

1.080

54

49

1.100 1.130

43
1.150

Temperature correction factors for coil capacity (kW)
Entering Water Minus Entering Air
Correction Factor

52

22

27

0.355

0.446

33

38

0.537 0.629

44

50

55

0.722

0.814

0.907

61

67

1.000 1.093

72
1.187

VAV-PRC012-EN

Performance Data

Low Height Series Fan-Powered Terminal Units
Table 54. Primary airflow control factory settings-I-P
Control Type

Air Valve Size Maximum Valve
(in.)
Cfm

Maximum Controller
Cfm

Minimum Controller
Cfm

Constant Volume
Cfm

Direct Digital Control/UCM

5
6
8
8x14

350
500
900
2200

40-350
60-500
105-900
200-2200

0, 40-350
0, 60-500
0, 105-900
0, 220-2200

40-350
60-500
105-900
220-2200

Pneumatic with Volume
Regulator

5
6
8
8x14

350
500
900
2100

63-350
73-500
134-900
297-2100

0, 63-350
0, 73-500
0, 134-900
0, 297-2100

63-350
73-500
134-900
297-2100

Analog Electronic

5
6
8
8x14

350
500
900
2200

82-350
120-500
210-900
440-2200

0, 82-310
0, 120-360
0, 210-660
0, 440-1475

82-310
120-360
210-660
440-1475

Table 55. Primary airflow control factory settings-SI
Air Valve Size
(in.)

Maximum
Valve L/s

Direct Digital Control/ UCM

5
6
8
8x14

165
236
425
1038

19-165
28-236
50-425
104-1038

0, 19-165
0, 28-236
0, 50-425
0, 104-1038

19-165
28-236
50-425
104-1038

Pneumatic with Volume Regulator

5
6
8
8x14

165
236
425
991

30-165
35-236
63-425
140-991

0, 30-165
0, 35-236
0, 63-425
0, 140-991

30-165
35-236
63-425
140-991

Analog Electronic

5
6
8
8x14

165
236
425
1038

39-165
57-236
100-425
208-1038

0, 39-146
0, 57-170
0, 100-311
0, 208-696

39-146
57-170
100-311
208-696

Control Type

Maximum Controller Minimum Controller L/
L/s
s

Note: Maximum airflow must be greater than or equal to minimum airflow.

Table 56. Unit air pressure drop
in. wg (I-P)

Pa (SI

Fan/Inlet Size

Airflow Cfm

Cooling Only

08SQ-05

150
250
350

0.01
0.03
0.11

08SQ-06

150
275
400
500

08SQ-08

09SQ-06

VAV-PRC012-EN

Fan/Inlet Size

Airflow L/s

Cooling Only

08SQ-05

71
118
165

2
9
28

0.02
0.14
0.35
0.58

08SQ-06

71
130
189
236

5
34
86
143

150
275
400
500

0.01
0.05
0.13
0.21

08SQ-08

71
130
189
236

3
14
32
52

350
400
450
500

0.17
0.26
0.37
0.50

09SQ-06

165
189
212
236

43
66
93
124

53

Performance Data

Table 56. Unit air pressure drop (continued)
in. wg (I-P)

Pa (SI

09SQ-08

400
600
750
900

0.08
0.24
0.40
0.61

09SQ-8x14

600
700
900
1050

10SQ-08

10SQ-8x14

09SQ-08

189
283
354
425

21
59
100
151

0.18
0.27
0.51
0.73

8x14-09SQ

283
330
425
495

44
66
126
182

400
600
800

0.08
0.38
0.84

10SQ-08

189
283
378

20
94
209

600
900
1100
1500

0.21
0.50
0.77
1.47

10SQ-8x14

283
425
519
708

51
124
191
367

Table 57. Coil air pressure drop
in.wg (I-P)
Fan
Size Airflow Cfm

Pa (SI)

1-Row HW (in.
wg)

2-Row HW (in.
wg)

08SQ

100
200
300
400
500

0.00
0.01
0.02
0.03
0.05

0.01
0.03
0.05
0.07
0.10

09SQ

400
550
700
850
1000

0.03
0.06
0.09
0.13
0.18

0.07
0.12
0.17
0.24
0.32

10SQ

400
800
1200
1600
2000

0.01
0.03
0.06
0.11
0.16

0.02
0.07
0.12
0.20
0.29

Fan Size Airflow L/s 1-Row HW (Pa)

2-Row HW (Pa)

08SQ

47
94
142
189
236

1
3
5
9
13

3
6
11
18
25

09SQ

189
260
330
401
472

9
15
23
33
44

18
29
43
0
80

10SQ

189
378
566
755
944

3
8
16
27
40

6
16
31
50
72

Note: HW Coil Only pressure drops do not include unit pressure drop.

Table 58. Attenuator air pressure drop
(I-P)

54

(SI)

Fan Size

Plenum Cfm

Attenuator

Fan Size

Plenum L/s

08SQ

150
250
350
450

Attenuator

0.02
0.04
0.06
0.09

08SQ

71
118
165
212

0.01
0.01
0.02
0.03

09SQ

350
500
650
800

0.06
0.10
0.15
0.22

09SQ

165
236
307
378

0.02
0.03
0.05
0.06

400
700
1000
1300
1600

0.02
0.05
0.09
0.14
0.20

10SQ

189
330
472
614
755

0.01
0.02
0.03
0.04
0.06

10SQ

VAV-PRC012-EN

Pa

In. wg

199

0.80

174

0.70

150

0.60

125

0.50

100

0.40

75

0.30

50

0.20

25

0.10

0

Low-Height Series 08SQ—PSC

170 cfm min
(80 L/s)

Discharge Static Pressure

Performance Data

0.00
150

200

250

300

350

400

450

500

550

600 Cfm

71

94

118

142

165

189

212

236

260

283 L/s

Airflow

1-row coil maximum
2-row coil maximum
Note: When attenuator is required, add inlet
attenuator pressure to discharge static
pressure for final fan performance.

In. wg
0.80

174

0.70

150

0.60

125

0.50

100

0.40

75

0.30

50

0.20

25

0.10

0

Low-Height Series 09SQ—PSC

350 cfm min
(165 L/s)

Minimum

Discharge Static Pressure

LSCF and LSEF maximum

Pa
199

0.00
300

400

500

600

700

800

900

1000

1100 Cfm

142

189

236

283

330

378

425

472

519 L/s

Pa

In. wg

199

0.80

174

0.70

150

0.60

125

0.50

100

0.40

75

0.30

50

0.20

25

0.10

0

Low-Height Series 10SQ—PSC

405 cfm min
(191 L/s)

Discharge Static Pressure

Airflow

0.00
300

500

700

900

1100

1300

1500

1700

1900

2100

2300 Cfm

142

236

330

425

519

614

708

802

897

991

1086 L/s

Airflow

VAV-PRC012-EN

55

Pa

In. wg

125

0.50

100

0.40

75

0.30

50

0.20

25

0.10

0

LSxF 08SQ—ECM

100 cfm min
(47 L/s)

Discharge Static Pressure

Performance Data

0.00
50
24

100

150

200

250

300

350

400

450

500

Cfm

47

71

94

118

142

165

189

212

236

L/s

Airflow

1-row coil maximum
2-row coil maximum
Notes:
1. ECMs (Electrically Commutated Motors) are
ideal for systems seeking maximum motor
efficiency.
2. When attenuator is required, add inlet
attenuator pressure to discharge static
pressure for final fan performance.

In. wg
0.50

100

0.40

75

0.30

50

0.20

25

0.10

0

0.00
200
94

LSxF 09SQ—ECM

240 cfm min
(113 L/s)

Minimum

Discharge Static Pressure

LSCF and LSEF maximum

Pa
125

300

400

500

600

700

800

900

142

189

236

283

330

378

425

1000 Cfm
472

L/s

Airflow

LSxF 10SQ—ECM

0.50

100

0.40

75

0.30

50

0.20

25

0.10

0

400 cfm min
(189 L/s)

Discharge Static Pressure

Pa In. wg
125

0.00
300

500

700

900

1100

1300

1500

1700

1900 Cfm

142

236

330

425

519

614

708

802

897 L/s

Airflow

56

VAV-PRC012-EN

Performance Data

Table 59. Heating capacity (MBh) - fan sizes 08SQ & 09SQ (I-P)

Rows

Gpm

Water
Pressure
Drop (ft)

100

200

300

400

500

600

700

800

900

1000

1-Row Capacity
MBH

1.0
2.0
3.0
4.0
5.0
6.0

0.15
0.58
1.27
2.24
3.48
4.98

7.92
8.08
8.17
8.24

11.16
11.48
11.69
11.83

13.45
13.94
14.25
14.47

15.34
15.98
16.39
16.69

16.97
17.76
18.28
18.65

18.42
19.36
19.99
20.43

19.73
20.82
21.54
22.06

20.92
22.16
22.98
23.58

22.01
23.39
24.32
24.99

23.02
24.54
25.57
26.31

2-Row Capacity
MBH

1.0
2.0
3.0
4.0
5.0

0.76
2.60
5.39
9.06
13.57

9.04
9.45
9.59
9.66
9.70

14.59
15.95
16.43
16.68
16.83

18.26
20.70
21.60
22.08
22.37

20.87
24.34
25.68
26.40
26.85

22.83
27.24
29.01
29.96
30.56

24.35
29.61
31.78
32.96
33.71

25.57
31.59
34.14
35.54
36.43

26.58
33.28
36.17
37.78
38.80

27.42
34.74
37.95
39.75
40.90

28.14
36.02
39.53
41.51
42.78

Airflow (Cfm)

Table 60. Heating capacity (MBh) - fan size 10SQ (I-P)

Rows

Gpm

Water
Pressure
Drop (ft)

450

600

750

900

1050

1200

1350

1500

1650

1800

1950

1-Row Capacity
MBH

1.0
2.0
4.0
6.0
8.0
10.0

0.16
0.61
2.32
5.09
8.91
13.77

25.05
26.10
26.66
27.02

28.61
30.00
30.76
31.23

31.67
33.40
34.34
34.95

34.39
36.45
37.59
38.32

36.86
39.26
40.59
41.44

39.12
41.85
43.38
44.36

41.23
44.28
46.00
47.11

43.18
46.57
48.48
49.72

45.02
48.73
50.83
52.20

46.75
50.77
53.07
54.56

48.41
52.71
55.20
56.83

2-Row Capacity
MBH

1.0
2.0
3.0
4.0
5.0

1.29
4.31
8.84
14.77
22.03

28.40
33.46
35.30
36.25
36.83

32.18
39.56
42.41
43.91
44.83

34.87
44.37
48.23
50.30
51.58

36.88
48.27
53.10
55.72
57.37

38.43
51.49
57.23
60.40
62.41

39.66
54.19
60.78
64.48
66.84

40.66
56.50
63.88
68.08
70.78

41.49
58.49
66.61
71.28
74.30

42.19
60.23
69.03
74.15
77.48

42.79
61.76
71.20
76.74
80.36

43.30
63.13
73.16
79.09
82.99

Airflow (Cfm)

Water Coil Notes
1. Fouling Factor = 0.0005.
2. The following equations may be used in calculating Leaving AirTemperature (LAT) and Water
Temperature Difference (WTD).
MBH  921.7
LAT = EAT +  --------------------------------------


Cfm
2  MBH
WTD = EWT – LWT =  ------------------------
 Gpm 

3. Capacity based on 70°F entering air temperature and 180°F entering water temperature. Refer
to correction factors for different entering conditions.
Table 61. Temperature correction factors for water pressure drop (ft)
Average Water Temperature
Correction Factor

200

190

180

170

160

150

140

130

120

110

0.970

0.985

1.000

1.020

1.030

1.050

1.080

1.100

1.130

1.150

Table 62. Temperature correction factors for coil capacity (MBH)
Entering Water Minus Entering Air
Correction Factor

VAV-PRC012-EN

40

50

0.355 0.446

60

70

80

90

100

110

120

130

0.537

0.629

0.722

0.814

0.907

1.000

1.093

1.187

57

Performance Data

Table 63. Heating capacity (kW) - fan size 08SQ & 09SQ (SI)
Airflow (L/s)

Rows

L/s

Water Pressure
Drop (kPa)

47

94

142

189

236

283

330

378

425

472

1-Row Capacity
kW

0.06
0.13
0.19
0.25
0.32
0.38

0.44
1.72
3.81
6.71
10.40
14.90

2.32
2.37
2.39
2.41

3.27
3.36
3.42
3.47

3.94
4.08
4.18
4.24

4.50
4.68
4.80
4.89

4.97
5.21
5.36
5.47

5.40
5.67
5.86
5.99

5.78
6.10
6.31
6.47

6.13
6.49
6.74
6.91

6.45
6.86
7.13
7.32

6.75
7.19
7.49
7.71

2-Row Capacity
kW

0.06
0.13
0.19
0.25
0.32

2.27
7.78
16.11
27.08
40.58

2.65
2.77
2.81
2.83
2.84

4.28
4.67
4.82
4.89
4.93

5.35
6.07
6.33
6.47
6.56

6.12
7.13
7.53
7.74
7.87

6.69
7.98
8.50
8.78
8.96

7.14
8.68
9.31
9.66
9.88

7.49
9.26
10.00
10.41
10.68

7.79
9.75
10.60
11.07
11.37

8.04
10.18
11.12
11.65
11.99

8.25
10.56
11.58
12.16
12.54

Table 64. Heating capacity (kW) - fan size 10SQ (SI)

Rows

Water
Pressure Drop
L/s
(kPa)

Airflow (L/s)
212

283

354

425

495

566

637

708

779

849

920

0.06
0.13
0.25
1-Row Capacity kW
0.38
0.50
0.63

0.48
1.82
6.93
15.22
26.64
41.16

7.34
7.65
7.81
7.92

8.38
8.79
9.01
9.15

9.28
9.79
10.07
10.24

10.08
10.68
11.02
11.23

10.80
11.50
11.90
12.15

11.47
12.27
12.71
13.00

12.08
12.98
13.48
13.81

12.66
13.65
14.21
14.57

13.19
14.28
14.90
15.30

13.70
14.88
15.55
15.99

13.70
14.88
15.55
15.99

0.06
0.13
2-Row Capacity kW 0.19
0.25
0.32

3.84
12.90
26.43
44.15
65.84

8.32
9.81
10.35
10.62
10.79

9.43
11.59
12.43
12.87
13.14

10.22
13.00
14.14
14.74
15.12

10.81
14.15
15.56
16.33
16.81

11.26
15.09
16.77
17.70
18.29

11.62
15.88
17.81
18.90
19.59

11.92
16.56
18.72
19.95
20.74

12.16
17.14
19.52
20.89
21.78

12.36
17.65
20.23
21.73
22.71

12.54
18.10
20.87
22.49
23.55

12.54
18.10
20.87
22.49
23.55

Water Coil Notes
1. Fouling Factor = 0.0005.|
2. The following equations may be used in calculating Leaving AirTemperature (LAT) and Water
Temperature Difference (WTD).
kW  0.83
LAT = EAT +  -----------------------------


Lls
kW
WTD = EWT – LWT =  ----------------------------
  4.19 Lls

3. Capacity based on 21°C entering air temperature and 82°C entering water temperature. Refer
to correction factors for different entering conditions.
Table 65. Temperature correction factors for water pressure drop (kPa)
Average Water Temperature
Correction Factor

93

88

82

77

71

66

60

54

49

43

0.970

0.985

1.000

1.020

1.030

1.050

1.080

1.100

1.130

1.150

Table 66. Temperature correction factors for coil capacity (kW)
Entering Water Minus Entering Air
Correction Factor

58

22

27

0.355

0.446

33

38

44

0.537 0.629 0.722

50

55

0.814

0.907

61

67

1.000 1.093

72
1.187

VAV-PRC012-EN

Electrical Data
Parallel Fan-Powered Terminal Units
Table 67. PSC motor units—electric coil kW guidelines – minimum to maximum (VPEF)
Single-Phase Voltage
Fan Size Stages

Three-Phase Voltage

120V

208V

240V

277V

347V

480V

208V

480V

600V

380V/
50Hz

02SQ

1
2

0.5-5.0
0.5-5.0

0.5-6.0
0.5-6.0

0.5-6.0
0.5-6.0

0.5-6.0
1.0-6.0

0.5-6.0
1.0-6.0

0.5-6.0
1.0-6.0

0.5-6.0
1.0-6.0

1.0-6.0
2.0-6.0

1.5-6.0
3.0-6.0

1.0-6.0
1.5-6.0

03SQ

1
2

0.5-5.0
0.5-5.0

0.5-9.0
0.5-9.0

0.5-10.0
0.5-10.0

0.5-11.0
1.0-11.0

0.5-11.0
1.0-11.0

0.5-11.0
1.0-11.0

0.5-11.0
1.0-11.0

1.0-11.0
2.0-11.0

1.5-11.0
3.0-11.0

1.0-11.0
1.5-11.0

04SQ

1
2

0.5-4.5
0.5-4.5

0.5-8.0
0.5-8.0

0.5-10.0
0.5-10.0

0.5-12.0
1.0-12.0

0.5-14.0
1.0-14.0

0.5-14.0
1.0-14.0

0.5-14.0
1.0-14.0

1.0-14.0
2.0-14.0

1.5-14.0
3.0-14.0

1.0-14.0
1.5-14.0

05SQ

1
2

0.5-4.5
0.5-4.5

0.5-8.0
0.5-8.0

0.5-9.0
0.5-9.0

0.5-12.0
1.0-12.

0.5-15.0
1.0-15.0

0.5-18.0
1.0-18.0

0.5-14.0
1.0-14.0

1.0-18.0
2.0-18.0

1.5-18.0
3.0-18.0

1.0-18.0
1.5-18.0

06SQ

1
2

-

0.5-9.0
0.5-9.0

-

0.5-12.0
1.0-12.0

0.5-15.0
1.0-15.0

0.5-16.0
1.0-16.0

0.5-15.0
1.0-15.0

1.0-16.0
2.0-16.0

1.5-16.0
3.0-16.0

1.0-16.0
1.5-16.0

07SQ

1
2

-

0.5-8.0
0.5-8.0

-

0.5-11.0
1.0-11.0

0.5-15.0
1.0-15.0

0.5-20.0
1.0-20.0

0.5-14.0
1.0-14.0

1.0-20.0
2.0-20.0

1.5-20.0
3.0-20.0

1.0-20.0
1.5-20.0

Table 68. ECM units—electric coil kW guidelines – minimum to maximum (VPEF)
Single-Phase Voltage

Three-Phase Voltage

Fan Size

Stages

120V

208V

240V

277V

347V

480V

208V

480V

600V

380V/
50Hz

03SQ

1
2

0.5-4.5
0.5-4.5

0.5-8.0
0.5-8.0

0.5-10.0
0.5-10.0

0.5-11.0
1.0-11.0

-

0.5-11.0
1.0-11.0

0.5-11.0
1.0-11.0

1.0-11.0
2.0-11.0

-

-

04SQ

1
2

0.5-4.5
0.5-4.5

0.5-8.0
0.5-8.0

0.5-9.0
0.5-9.0

0.5-12.0
1.0-12.0

-

0.5-14.0
1.0-14.0

0.5-14.0
1.0-14.0

1.0-14.0
2.0-14.0

-

-

05SQ

1
2

0.5-4.0
0.5-4.0

0.5-7.0
0.5-7.0

0.5-8.0
0.5-8.0

0.5-11.0
1.0-11.0

-

0.5-18.0
1.0-18.0

0.5-12.0
1.0-12.0

1.0-18.0
2.0-18.0

-

-

06SQ

1
2

0.5-4.0
0.5-4.0

0.5-7.0
0.5-7.0

0.5-8.0
0.5-8.0

0.5-11.0
1.0-11.0

-

0.5-16.0
1.0-16.0

0.5-12.0
1.0-12.0

1.0-16.0
2.0-16.0

-

-

Notes:
1. Coils available with 24-VAC magnetic or mercury contactors, load carrying P.E. switches, and P.E. switch with magnetic or mercury contactors.
2. Available kW increments are by 0.5 from 0.5 kW to 8.0 kW, by 1.0 kW from 9.0 to 18.0 kW, and by 2.0 kW from 18.0 to 20.0 kW.
3. Each stage will be equal in kW output.
4. All heaters contain an auto reset thermal cutout and a manual reset cutout.
5. See section “Formulas,” p. 73 for formulas used to calculate the current amp draw for the heater elements.
6. Recommended coil temperature rise = 20° to 30°F (-7° to -1°C). Maximum temperature rise = 55°F (12°C).
7. Heaters should not operate at cfms below the nameplate minimum.

Table 69. Fan electrical performance (PSC)
Maximum Fan Motor Amperage (FLA)
Fan Size

HP

115 VAC

208 VAC

277 VAC

02SQ

1/8

1.6

-

0.7

03SQ

1/3

4.3

-

1.6

04SQ

1/3

5.5

-

2.0

05SQ

1/2

6.7

-

2.4

06SQ

1/2

-

4.6

3.8

07SQ

1

-

6.6

4.7

VAV-PRC012-EN

59

Electrical Data

Table 69. Fan electrical performance (PSC)
Notes:
1. Electric Heat Units - Units with fan sizes 02SQ to 05SQ and a primary voltage of 208/60/1, 208/60/3, or 240/60/1 have 115/60/1 VAC fan motors. Fan
sizes 06SQ and 07SQ with the same voltages, have 208/60/1 VAC motors.
2. Electric Heat Units - Units with primary voltage of 277/60/1, 480/60/1 or 480/60/3 use 277 VAC fan motors.
3. Electric Heat Units - Units with primary voltage of 347/60/1 or 575/60/3 use 347 VAC fan motors.
4. With 380/50/3 and 230/50/1, use 230/50 motors.

Table 70. Fan electrical performance (ECM)
Maximum Fan Motor Amperage (FLA)
Fan Size

HP

115 VAC

277 VAC

03SQ

1/3

4.5

2.4

04SQ

1/2

6.5

3.5

05SQ

1

10.1

5.4

06SQ

1

9.5

5.1

Notes:
1. Electric heat units—units with primary voltages of 208/60/1, 208/60/3, or 240/60/1 have 115-VAC fan motors.
2. Electric heat units—units with primary voltages of 277/60/1, 480/60/1, or 480/60/3 have 277-VAC fan motors.
3. 347/60/1 and 230/50/1 voltage motors not available with ECMs.

Table 71. Minimum unit electric heat Cfm guidelines (PSC)
Cfm

60

Unit kW

02SQ

03SQ

04SQ

05SQ

06SQ

07SQ

0.5
1
1.5

118
118
118

200
200
200

315
315
315

350
350
350

533
533
533

585
585
585

2
2.5
3

118
146
174

200
200
200

315
315
315

350
350
350

533
533
533

585
585
585

3.5
4
4.5

201
229
257

200
230
260

315
315
315

350
350
350

533
533
533

585
585
585

5
5.5
6

285
312
340

290
315
350

315
315
350

350
350
350

533
533
533

585
585
585

6.5
7
7.5

-

375
400
430

375
400
430

375
400
430

533
533
533

585
585
585

8
9
10

-

460
515
575

460
515
575

460
515
575

533
589
645

585
633
682

11
12
13

-

630
-

630
690
745

630
690
745

701
758
814

730
779
827

14
15
16

-

-

810
-

810
860
920

870
926
982

876
924
972

17
18
20

-

-

-

973
1030
-

-

1021
1069
1166

VAV-PRC012-EN

Electrical Data

Table 72. Minimum unit electric heat L/s guidelines (PSC)
L/s
Unit kW

02SQ

03SQ

04SQ

05SQ

06SQ

07SQ

0.5
1
1.5

56
56
56

94
94
94

149
149
149

165
165
165

252
252
252

276
276
276

2
2.5
3

56
69
82

94
94
94

149
149
149

165
165
165

252
252
252

276
276
276

3.5
4
4.5

95
108
121

94
109
123

149
149
149

165
165
165

252
252
252

276
276
276

5
5.5
6

134
147
160

137
149
165

149
149
165

165
165
165

252
252
252

276
276
276

6.5
7
7.5

-

177
189
203

177
189
203

177
189
203

252
252
252

276
276
276

8
9
10

-

217
243
271

217
243
271

217
243
271

252
278
305

276
299
322

11
12
13

-

297
-

297
326
352

297
326
352

331
358
384

345
367
390

14
15
16

-

-

382
-

382
406
434

410
437
463

413
436
459

17
18
20

-

-

-

459
486
-

-

482
505
550

Table 73. Minimum unit electric heat Cfm guidelines (ECM)
Cfm
Unit kW

03SQ

04SQ

05SQ

06SQ

0.5
1
1.5

200
200
200

315
315
315

350
350
350

560
560
560

2
2.5
3

200
200
200

315
315
315

350
350
350

560
560
560

3.5
4
4.5

200
230
260

315
315
315

350
350
350

560
560
560

5
5.5
6

290
315
350

315
315
350

350
350
350

560
560
560

6.5
7
7.5

375
400
430

375
400
430

375
400
430

560
560
560

8
9
10

460
515
575

460
515
575

460
515
575

560
604
649

VAV-PRC012-EN

61

Electrical Data

Table 73. Minimum unit electric heat Cfm guidelines (ECM) (continued)
Cfm
Unit kW

03SQ

04SQ

05SQ

06SQ

11
12
13

630
-

630
690
745

630
690
745

693
738
782

14
15
16

-

810
-

810
860
920

826
871
915

17
18

-

-

973
1030

-

Table 74. Minimum unit electric heat L/s guidelines (ECM)
L/s

62

Unit kW

03SQ

04SQ

05SQ

06SQ

0.5
1
1.5

94
94
94

149
149
149

165
165
165

264
264
264

2
2.5
3

94
94
94

149
149
149

165
165
165

264
264
264

3.5
4
4.5

94
109
123

149
149
149

165
165
165

264
264
264

5
5.5
6

137
149
165

149
149
165

165
165
165

264
264
264

6.5
7
7.5

177
189
203

177
189
203

177
189
203

264
264
264

8
9
10

217
243
271

217
243
271

217
243
271

264
285
306

11
12
13

297
-

297
326
352

297
326
352

327
348
369

14
15
16

-

382
-

382
406
434

390
411
432

17
18

-

-

459
486

-

VAV-PRC012-EN

Electrical Data

Series Fan-Powered Terminal Units
Table 75. VSEF—electric coil kW guidelines – minimum to maximum (PSC motor units)
Single-Phase Voltage

Fan
Size Stages

Three-Phase Voltage

120V

208V

240V

277V

347V

480V

208V

480V

600V

380V/50Hz

02SQ

1
2

0.5-5.0
0.5-5.0

0.5-7.0
0.5-7.0

0.5-7.0
0.5-7.0

0.5-7.0
1.0-7.0

0.5-7.0
1.0-7.0

1.0-7.0
1.5-7.0

0.5-7.0
1.0-7.0

1.0-7.0
3.5-7.0(a)

1.5-7.0
-

1.5-7.0
2.5-7.0

03SQ

1
2

0.5-5.0
0.5-5.0

0.5-9.0
0.5-9.0

0.5-10.0
0.5-10.0

0.5-12.0
1.0-12.0

0.5-14.0
1.0-14.0

1.0-13.0(b)
1.5-13.0(b)

0.5-14.0
1.0-14.0

1.0-12.0
3.5-12.0(a)

1.5-13.0
-

1.0-14(c)
2.5-13(c)

04SQ

1
2

0.5-4.5
0.5-4.5

0.5-8.0
0.5-8.0

0.5-10.0
0.5-10.0

0.5-12.0
1.0-12.0

0.5-16.0
1.0-16.0

0.5-18.0
1.0-18.0

0.5-15.0
1.0-15.0

1.0-18.0
2.5-18.0

1.5-18.0(d)
4.0-15.0

1.0-18
1.5-18

05SQ

1
2

0.5-4.5
0.5-4.5

0.5-8.0
0.5-8.0

0.5-9.0
0.5-9.0

0.5-12.0
1.0-12.0

0.5-15.0
1.0-15.0

0.5-20.0
1.0-20.0

0.5-14.0
1.0-14.0

1.0-20.0
2.5-20.0

1.5-22.0
4.0-20.0(e)

1.0-22.0
1.5-22.0

06SQ

1
2

-

0.5-9.0
0.5-9.0

-

0.5-12.0
1.0-12.0

0.5-15.0
1.0-15.0

0.5-22.0
1.0-22.0

0.5-15.0
1.0-15.0

1.0-22.0
2.0-22.0

1.5-22.0
3.0-22.0

1.0-22
1.5-22

07SQ

1
2

-

0.5-8.0
0.5-8.0

-

0.5-11.0
1.0-11.0

0.5-15.0
1.0-15.0

0.5-20.0
1.0-20.0

0.5-14.0
1.0-14.0

1.0-24.0
2.0-24.0

1.5-24.0
3.0-24.0

-

(a) 4.5, 5.5, 6.5, 9, 11, 13 kW not available
(b) 12 kW not available
(c) 10, 13 kW not available
(d) 16, 17 kW not available
(e) 18 kW not available

Table 76. VSEF—electric coil kW guidelines – minimum to maximum (ECM units)
Single-Phase Voltage
Fan
Size Stages

Three-Phase Voltage

120V

208V

240V

277V

347V

480V

208V

480V

600V

380V/
50Hz

03SQ

1
2

0.5-4.5
0.5-4.5

0.5-8.0
0.5-8.0

0.5-10.0
0.5-10.0

0.5-12.0
1.0-12.0

-

1.0-13.0(a)
1.5-13.0(a)

0.5-14.0
1.0-14.0

1.0-12.0
3.5-12.0(b)

-

-

04SQ

1
2

0.5-4.5
0.5-4.5

0.5-8.0
0.5-8.0

0.5-9.0
0.5-9.0

0.5-12.0
1.0-12.0

-

0.5-18.0
1.0-18.0

0.5-14.0
1.0-14.0

1.0-18.0(c)
2.5-15.0

-

-

05SQ

1
2

0.5-4.0
0.5-4.0

0.5-7.0
0.5-7.0

0.5-8.0
0.5-8.0

0.5-11.0
1.0-11.0

-

0.5-18.0
1.0-18.0

0.5-12.0
1.0-12.0

1.0-22.0
2.5-20.0

-

-

06SQ

1
2

0.5-4.0
0.5-4.0

0.5-7.0
0.5-7.0

0.5-8.0
0.5-8.0

0.5-11.0
1.0-11.0

-

0.5-22.0
1.0-22.0

0.5-12.0
1.0-12.0

1.0-22.0
2.0-22.0

-

-

Notes:
1. Coils available with electric, 24 VAC magnetic or contactors, load carrying P.E. switches, and P.E. switches with magnetic or mercury contactors.
2. Available kW increments are by 0.5 from 0.5 to 8.0 kW, by 1.0 kW from 9.0 to 17.0 kW, and by 2.0 kW from 18.0 to 24.0 kW.
3. Each stage will be equal in kW output.
4. All heaters contain an auto reset thermal cutout and a manual reset cutout.
5. See section “Formulas,” p. 73 for formulas used to calculate the current amp draw for the heater elements.
6. Recommended coil temperature rise = 20°-30°F (-7° to -1°C). Maximum temperature rise = 55°F (12°C).
7. Heaters should not operate at cfms below the nameplate minimum.
(a) 12 kW not available
(b) 4.5, 5,5, 6.5, 9, 11 kW not available
(c) 16, 17 kW not available

Table 77. Fan electrical performance (PSC)
Maximum Fan Motor Amperage (FLA)
Fan Size

HP

115 VAC

208 VAC

277 VAC

02SQ

1/8

1.6

-

0.7

03SQ

1/3

4.3

-

1.6

04SQ

1/3

5.5

-

2.0

05SQ

1/2

6.7

-

2.4

06SQ

1/2

-

4.6

3.8

VAV-PRC012-EN

63

Electrical Data

Table 77. Fan electrical performance (PSC)
07SQ

1

-

6.6

4.7

Notes:
1. Electric Heat Units—Units with fan sizes 02SQ to 05SQ and a primary voltage of 208/60/1, 208/60/3 or 0/60/1 use 115/60/1 VAC fan motors. Fan
sizes 06SQ and 07SQ in these same voltages, have 208/60/1 VAC fan motors.
2. Electric Heat Units—Units with primary voltage of 277/60/1, 480/60/1 or 480/60/3 use 277 VAC fan motors.
3. Electric Heat Units—Units with primary voltage of 347/60/1 or 575/60/3 use 347 VAC fan motors.
4. With 380/50/3 and 230/50/1 use 230/50 motors.

Table 78. Fan electrical performance (ECM)
Maximum Fan Motor Amperage (FLA)
Fan Size

HP

120 VAC

277 VAC

03SQ

1/3

4.5

2.4

04SQ

½

6.5

3.5

05SQ

1

10.1

5.4

06SQ

1

9.5

5.1

Notes:
1. Acceptable selections are any point within the shaded area. The ECM will operate on a vertical performance line using the solid state speed controller
provided.
2. The ECM motor provides constant volume with changing static pressure conditions. Therefore, the fan curves for the ECM are different compared to
fan curves with PSC motors.
3. By using an ECM motor, less fan sizes are used because of the wider turn-down ratios.

Table 79. Minimum unit electric
Heat Cfm Guidelines (PSC)

64

Unit kW

02SQ

03SQ

04SQ

05SQ

06SQ

07SQ

0.5
1
1.5

191
191
191

260
260
260

315
315
315

400
400
400

700
700
700

850
850
850

2
2.5
3

191
191
214

260
260
260

315
315
315

400
400
400

700
700
700

850
850
850

3.5
4
4.5

236
259
282

260
260
260

315
315
315

400
400
400

700
700
700

850
850
850

5
5.5
6

304
327
350

290
315
350

315
315
350

400
400
400

700
700
700

850
850
850

6.5
7
7.5

372
395
-

375
400
430

375
400
430

400
400
430

700
700
700

850
850
850

8
9
10

-

460
515
575

460
515
575

460
515
575

700
700
700

850
850
850

11
12
13

-

630
690
745

630
690
745

630
690
745

713
792
872

850
902
954

14
15
16

-

810
-

810
860
920

810
860
920

951
1031
1110

1006
1057
1109

17
18
20

-

-

973
1030
-

973
1030
1150

1190
1269
1428

1161
1213
1317

22
24

-

-

-

1260
-

1587
-

1420
1524

VAV-PRC012-EN

Electrical Data

Table 80. Minimum unit electric
Heat L/s Guidelines (PSC)
Unit kW

02SQ

03SQ

04SQ

05SQ

06SQ

07SQ

0.5
1
1.5

90
90
90

123
123
123

149
149
149

189
189
189

330
330
330

401
401
401

2
2.5
3

90
90
101

123
123
123

149
149
149

189
189
189

330
330
330

401
401
401

3.5
4
4.5

112
122
133

123
123
123

149
149
149

189
189
189

330
330
330

401
401
401

5
5.5
6

144
154
165

137
149
165

149
149
165

189
189
189

330
330
330

401
401
401

6.5
7
7.5

176
186
-

177
189
203

177
189
203

189
189
203

330
330
330

401
401
401

8
9
10

-

217
243
271

217
243
271

217
243
271

330
330
330

401
401
401

11
12
13

-

297
326
352

297
326
352

297
326
352

336
374
411

401
426
450

14
15
16

-

382
-

382
406
434

382
406
434

449
486
524

475
499
524

17
18
20

-

-

459
486
-

459
486
543

562
599
674

548
572
621

22
24

-

-

-

595
-

749
-

670
719

VAV-PRC012-EN

65

Electrical Data

Table 81. Minimum unit electric
Heat Cfm Guidelines (ECM)

66

Unit kW

03SQ

04SQ

05SQ

06SQ

0.5
1
1.5

260
260
260

315
315
315

400
400
400

943
943
943

2
2.5
3

260
260
260

315
315
315

400
400
400

943
943
943

3.5
4
4.5

260
260
260

315
315
315

400
400
400

943
943
943

5
5.5
6

290
315
350

315
315
350

400
400
400

943
943
943

6.5
7
7.5

375
400
430

375
400
430

400
400
430

943
943
943

8
9
10

460
515
575

460
515
575

460
515
575

943
943
975

11
12
13

630
690
745

630
690
745

630
690
745

1006
1038
1069

14
15
16

810
-

810
860
920

810
860
920

1101
1133
1164

17
18
20
22

-

973
1030
-

973
1030
1150
1260

1196
1228
1291
1354

VAV-PRC012-EN

Electrical Data

Table 82. Minimum unit electric
Heat L/s Guidelines (ECM)
Unit kW

03SQ

04SQ

05SQ

06SQ

0.5
1
1.5

123
123
123

149
149
149

189
189
189

445
445
445

2
2.5
3

123
123
123

149
149
149

189
189
189

445
445
445

3.5
4
4.5

123
123
123

149
149
149

189
189
189

445
445
445

5
5.5
6

137
149
165

149
149
165

189
189
189

445
445
445

6.5
7
7.5

177
189
203

177
189
203

189
189
203

445
445
445

8
9
10

217
243
271

217
243
271

217
243
271

445
445
460

11
12
13

297
326
352

297
326
352

297
326
352

475
490
505

14
15
16

382
-

382
406
434

382
406
434

520
535
549

17
18
20
22

-

459
486
-

459
486
543
595

564
579
609
639

VAV-PRC012-EN

67

Electrical Data

Low Height Parallel Fan-Powered Terminal Units
Table 83. LPEF—electric coil kW guidelines – minimum to maximum (PSC motor units)
Single-Phase Voltage
Fan Size Stages

Three-Phase Voltage

120V

208V

240V

277V

347V

480V

208V

480V

600V

380V/
50Hz

08SQ

1
2

0.5-4.5
0.5-4.5

0.5-7.0
0.5-7.0

0.5-7.0
0.5-7.0

0.5-7.0
1.0-7.0

0.5-7.0
1.0-7.0

0.5-7.0
1.0-7.0

0.5-7.0
1.0-7.0

1.0-7.0
2.0-7.0

1.5-7.0
3.0-7.0

-

09SQ

1
2

0.5-4.5
0.5-4.5

0.5-8.0
0.5-8.0

0.5-10.0
0.5-10.0

0.5-12.0
1.0-12.0

0.5-14.0
1.0-14.0

0.5-14.0
1.0-14.0

0.5-14.0
1.0-14.0

1.0-14.0
2.0-14.0

1.5-14.0
3.0-14.0

-

10SQ

1
2

0.5-4.0
0.5-4.0

0.5-8.0
0.5-8.0

0.5-9.0
0.5-9.0

0.5-12.0
1.0-12.0

0.5-14.0
1.0-14.0

0.5-14.0
1.0-14.0

1.0-13.0
1.0-13.0

1.0-14.0
2.0-14.0

1.5-12.0
3.0-12.0

-

Table 84. LPEF–electric coil kW guidelines – minimum to maximum (ECM units)
Single-Phase Voltage
Fan Size Stages

Three-Phase Voltage

120V

208V

240V

277V

347V

480V

208V

480V

600V

380V/
50Hz

08SQ

1
2

0.5-5.0
0.5-5.0

0.5-7.0
0.5-7.0

0.5-7.0
0.5-7.0

0.5-7.0
1.0-7.0

-

0.5-7.0
1.0-7.0

0.5-7.0
1.0-7.0

1.0-7.0
2.0-7.0

-

-

09SQ

1
2

0.5-4.5
0.5-4.5

0.5-8.0
0.5-8.0

0.5-9.0
0.5-9.0

0.5-12.0
1.0-12.0

-

0.5-14.0
1.0-14.0

0.5-14.0
1.0-14.0

1.0-14.0
2.0-14.0

-

-

Notes:
1. Coils available with 24 VAC magnetic or mercury contactors, load carrying P.E. switches, and P.E. switch with magnetic or mercury
contractors.
2. Available kW increments are by 0.5 from 0.5 kW to 8.0 kW and by 1.0 kW from 9.0 to 14.0 kW.
3. Each stage will be equal in kW output.
4. All heaters contain an auto thermal cutout and a manual reset cutout.
5. The current amp draw for the heater elements is calculated by the formula below.

Table 85. Fan electrical performance (PSC)
Maximum Fan Motor Amperage (FLA)
Fan Size

HP

115 VAC

277 VAC

347 VAC

08SQ

1/3

5.5

2.5

1.8

09SQ

1/3

5.5

2.5

1.8

10SQ*

2 x 1/8

9.4

3.5

3.0

Notes:
1. Electric Heat Units - Units with Primary Voltage of 208/60/1, 208/60/3 or 240/60/1 use 115 VAC fan motors.
2. Electric Heat Units - Units with Primary Voltage of 277/60/1, 480/60/1 or 480/60/3 use 277 VAC fan motors.
3. Electric Heat Units - Units with Primary Voltage of 347/60/1 or 575/60/3 use 347 VAC fan motors.
4. Values are for standard, single-speed, permanent split capacitor type motors. Consult factory for non-standard motor performance.
5. Motor amps for 10SQ are total amps for two motors.

Table 86. Fan electrical performance (ECM)
Maximum Fan Motor Amperage (FLA)

68

Fan Size

HP

115 VAC

277 VAC

08SQ

1/2

2.0

1.1

09SQ

1/2

6.7

3.6

VAV-PRC012-EN

Electrical Data

Table 87. Minimum unit electric heat guidelines
Cfm (PSC)

L/s (PSC)

Unit kW

08SQ

09SQ

10SQ

Unit kW

08SQ

09SQ

10SQ

0.5
1
1.5

173
173
173

440
440
440

720
720
720

0.5
1
1.5

82
82
82

208
208
208

340
340
340

2
2.5
3

173
173
173

440
440
440

720
720
720

2
2.5
3

82
82
82

208
208
208

340
340
340

3.5
4
4.5

202
232
261

440
440
440

720
720
720

3.5
4
4.5

95
109
123

208
208
208

340
340
340

5
5.5
6

290
319
349

440
440
440

720
720
720

5
5.5
6

137
151
164

208
208
208

340
340
340

6.5
7
7.5

378
407
-

440
440
468

720
720
720

6.5
7
7.5

178
192
-

208
208
221

340
340
340

8
9
10

-

496
552
608

720
720
720

8
9
10

-

234
261
287

340
340
340

11
12
13
14

-

664
720
776
832

720
720
720
-

11
12
13
14

-

313
340
366
393

340
340
340
-

Table 88. Minimum unit electric heat Cfm guidelines (ECM)
Cfm (ECM)

L/s (ECM)

Unit kW

08SQ

09SQ

Unit kW

08SQ

09SQ

0.5
1
1.5

188
188
188

490
490
490

0.5
1
1.5

89
89
89

231
231
231

2
2.5
3

188
188
188

490
490
490

2
2.5
3

89
89
89

231
231
231

3.5
4
4.5

220
251
283

490
490
490

3.5
4
4.5

104
118
133

231
231
231

5
5.5
6

314
346
377

490
490
490

5
5.5
6

148
163
178

231
231
231

6.5
7
7.5

409
440
-

490
490
514

6.5
7
7.5

193
208
-

231
231
243

8
9
10

-

539
588
637

8
9
10

-

254
277
300

11
12
13
14

-

685
734
783
832

11
12
13
14

-

323
347
370
393

VAV-PRC012-EN

69

Electrical Data

Low Height Series Fan-Powered Terminal Units
Table 89. LSEF-electric coil kW guidelines-minimum to maximum (PSC motor units)
Single-Phase Voltage
Fan Size Stages

Three-Phase Voltage

120V

208V

240V

277V

347V

480V

208V

480V

600V

380V/
50Hz

08SQ

1
2

0.5-4.5
0.5-4.5

0.5-6.0
0.5-6.0

-

0.5-6.0
0.5-6.0

0.5-6.0
1.0-6.0

0.5-6.0
1.0-6.0

0.5-6.0
1.0-6.0

1.0-6.0
3.0-6.0

1.5-6.0
5.0-5.0

-

09SQ

1
2

0.5-4.5
0.5-4.5

0.5-8.0
0.5-8.0

0.5-10.0
0.5-10.0

0.5-12.0
1.0-12.0

0.5-12.0
1.0-12.0

0.5-12.0
1.0-12.0

0.5-12.0
1.0-12.0

1.0-12.0
3.0-12.0

1.5-12.0
4.5, 5, 9, 10

-

10SQ

1
2

0.5-4.0
0.5-4.0

0.5-7.5
0.5-7.5

0.5-8.0
0.5-8.0

0.5-11.0
1.0-11.0

0.5-15.0
1.0-15.0

0.5-18.0
1.0-18.0

0.5-13.0
1.0-13.0

1.0-18.0
2.0-18.0

1.5-18.0
3.0-18.0

-

Table 90. LSEF-electric coil kW guidelines-minimum to maximum (ECM units)
Single-Phase Voltage
Fan Size Stages

Three-Phase Voltage

120V

208V

240V

277V

347V

480V

208V

480V

600V

380V/
50Hz

08SQ

1
2

0.5-5.0
0.5-5.0

0.5-6.0
0.5-6.0

0.5-6.0
0.5-6.0

0.5-6.0
1.0-6.0

-

0.5-6.0
1.0-6.0

0.5-6.0
1.0-6.0

1.0-6.0
3.0-6.0

-

-

09SQ

1
2

0.5-4.5
0.5-4.5

0.5-8.0
0.5-8.0

0.5-10.0
0.5-10.0

0.5-12.0
1.0-12.0

-

0.5-12.0
1.0-12.0

0.5-12.0
1.0-12.0

1.0-12.0
3.0-12.0

-

-

10SQ

1
2

0.5-4.5
0.5-4.5

0.5-8.0
0.5-8.0

0.5-9.0
0.5-9.0

0.5-12.0
1.0-12.0

-

0.5-18.0
1.0-18.0

0.5-14.0
1.0-14.0

1.0-18.0
2.0-18.0

-

-

Notes:
1. Coils available with 24 VAC magnetic or mercury contactors, load carrying P.E. switches, and P.E. switch with magnetic or mercury
contactors.
2. Available kW increments are by 0.5 from 0.5 kW to 8.0 kW and by 1.0 kW from 9.0 to 18.0 kW.
3. Each stage will be equal in kW output.
4. All heaters contain an auto thermal cutout and a manual reset cutout.
5. The current amp draw for the heater elements is calculated by the formula below.

Table 91. Fan electrical performance (PSC)
Maximum Fan Motor Amperage (FLA)
Fan Size

HP

115 VAC

277 VAC

347 VAC

08SQ

1/3

5.5

2.5

1.8

09SQ

1/3

5.5

2.5

1.8

10SQ*

2 x 1/3

11.0

5.0

3.5

Notes:
1. Electric Heat Units - Units with Primary Voltage of 208/60/1, 208/60/3 or 240/60/1 use 115 VAC fan motors.
2. Electric Heat Units - Units with Primary Voltage of 277/60/1, 480/60/1 or 480/60/3 use 277 VAC fan motors.
3. Electric Heat Units - Units with Primary Voltage of 347/60/1 or 575/60/3 use 347 VAC fan motors.
4. Values are for standard, single-speed, permanent split capacitor type motors. Consult factory for non-standard motor performance.
5. Motor amps for 10SQ are total amps for two motors.

Table 92. Fan electrical performance (ECM)
Maximum Fan Motor Amperage (FLA)

70

Fan Size

HP

115 VAC

08SQ

1/2

1.3

277 VAC
.7

09SQ

1/2

5.0

2.7

10SQ

2 x 1/2

7.5

4.0

VAV-PRC012-EN

Electrical Data

Table 93. Minimum unit electric heat guidelines (PSC)
Cfm

L/s

Unit kW

08SQ

09SQ

10SQ

Unit kW

08SQ

09SQ

10SQ

0.5
1
1.5

228
228
228

377
377
377

440
440
440

0.5
1
1.5

108
108
108

178
178
178

208
208
208

2
2.5
3

228
244
260

377
377
377

440
440
440

2
2.5
3

108
115
123

178
178
178

208
208
208

3.5
4
4.5

276
293
309

377
377
377

440
440
440

3.5
4
4.5

130
138
146

178
178
178

208
208
208

5
5.5
6

325
341
357

377
377
377

440
440
440

5
5.5
6

153
161
168

178
178
178

208
208
208

6.5
7
7.5

-

403
429
455

440
440
467

6.5
7
7.5

-

190
202
215

208
208
220

8
9
10

-

480
532
584

494
547
601

8
9
10

-

227
251
275

233
258
284

11
12
13

-

635
687
-

655
708
762

11
12
13

-

300
324
-

309
334
360

14
15
16

-

-

815
869
923

14
15
16

-

-

385
410
435

17
18

-

-

976
1030

17
18

-

-

461
486

VAV-PRC012-EN

71

Electrical Data

Table 94. Minimum unit electric heat guidelines (ECM)
Cfm

72

L/s

Unit kW

08SQ

09SQ

10SQ

Unit kW

08SQ

09SQ

10SQ

0.5
1
1.5

128
128
128

377
377
377

480
480
480

0.5
1
1.5

60
60
60

178
178
178

227
227
227

2
2.5
3

128
159
190

377
377
377

480
480
480

2
2.5
3

60
75
90

178
178
178

227
227
227

3.5
4
4.5

221
253
284

377
377
377

480
480
480

3.5
4
4.5

104
119
134

178
178
178

227
227
227

5
5.5
6

315
346
377

377
377
377

480
480
480

5
5.5
6

149
163
178

178
178
178

227
227
227

6.5
7
7.5

-

403
429
455

480
480
505

6.5
7
7.5

-

190
202
215

227
227
238

8
9
10

-

480
532
584

530
580
630

8
9
10

-

227
251
276

250
274
297

11
12
13

-

635
687
-

680
730
779

11
12
13

-

300
324
-

321
345
368

14
15
16

-

-

829
879
929

14
15
16

-

-

391
415
438

17
18

-

-

979
1029

17
18

-

-

462
486

VAV-PRC012-EN

Electrical Data

Formulas
Fan-Powered Parallel
Minimum Circuit Ampacity (MCA) Equation
MCA = 1.25 x ( motor amps + heater amps)
Motor amps is the sum of all motor current draws if more than one is used in the unit.
Maximum Overcurrent Protection (MOP) Equation
MOP = (2.25 x motor1 amps) + motor2 amps + heater amps
motor1 amps = current draw of largest motor
motor2 amps = sum of current of all other motors used in unit
General Sizing Rules:
•

If MOP = 15, then fuse size = 15

•

If MOP = 19, then fuse size = 15 with one exception. If heater amps x 1.25 > 15, then fuse size = 20.

•

If MOP is equal to or less than MCA, then choose next fuse size greater than MCA.

•

Control fusing not applicable.

•

Standard Fuse Sizes: 15, 20, 25, 30, 35, 40, 45, 50, and 60.

Example:
A modelVPEF, electric reheat unit size 10-05SQ has 480/3 phase, 12 kW electric reheat with 2 stages
and 277-Volt motor.
For MOP of fan-powered unit:
12 kW-480/3 heater:12x1000/480x1.73=14.45 amps
MCA = (2.4 + 14.45) x 1.25 = 21.06, MOP = (2.25 x 2.4) + 14.45 = 19.9.
Since MOP is less than or equal to MCA, then MOP = 25.
For total current draw of unit:
12kW-480/3 heater:12x1000/480x1.73=14.45
Two heat outputs (2 stages) @0.5 amps max each=1.00
Motor amps: 277 V (Fan size 0517) =2.4
Amps Max: 18.35
Useful Formulas:
Cfm  ATDkW = ------------------------------3145
 3145ATD = kW
-----------------------------|
Cfm
kW
ATD = ------------------------------1214  L  s
kW  1000
amps = -------------------------------------------------------------PrimaryVoltage 
kW  1000
amps = -----------------------------------------------PrimaryVoltag

kW = 1214 x L/s x ATD

VAV-PRC012-EN

73

Electrical Data

Fan-Powered Series
Minimum Circuit Ampacity (MCA) Equation
•

MCA = 1.25 x (Smotor amps + heater amps)
Here motor amps is the sum of all motor current draws if more than one is used in the unit.

Maximum Overcurrent Protection (MOP) Equation
•

MOP = (2.25 x motor 1amps) + motor2 amps + heater amps motor1 amps = current draw of
largest motor
motor2 amps = sum of current draw of all other motors used in units

General Sizing Rules:
•

If MOP = 15, then fuse size = 15

•

If MOP = 19, then fuse size = 15 with one exception. If heater amps x 1.25 > 15, then fuse size = 20.

•

If MOP is less than/equal to MCA, then choose next fuse size greater than MCA.

•

Control fusing not applicable.

•

Standard Fuse Sizes: 15, 20, 25, 30, 35, 40, 45, 50, and 60.

Example:
A model VSEF, electric reheat unit size 10-0517 has 480/3 phase, 12 kW electric reheat with 2 stages
and 277-Volt motor.
For MOP of fan-powered unit:
12 kW - 480/3 heater:12x1000/480x1.73=14.45 amps.
MCA=(2.4 + 14.45) x 1.25 = 21.06, MOP = (2.25 x 2.4) + 14.45 = 19.9.
Since MOP is less than/equal to MCA, then MOP = 25.
For total current draw of unit:
12 kW—480/3 heater:12x1000/480x1.73=14.45
Two heat outputs (2 stages)@0.5 amps max each=1.00
Motor amps: 277 V (Fan size 0517)=2.4
Total amps max: 18.35
Used Formulas:
kW  1000
amps = -------------------------------------------------------------PrimaryVoltage 
Cfm  ATDkW = ------------------------------3145
 3145ATD = kW
-----------------------------Cfm
kW
ATD = ------------------------------1214  L  s
kW  1000
amps = -----------------------------------------------PrimaryVoltag

kW=1214 x L/s x ATD

74

VAV-PRC012-EN

Electrical Data

Low Height Parallel Fan-Powered
Minimum Circuit Ampacity (MCA) = (motor amps + heater amps) x 1.25
Maximum Overcurrent Protection (MOP) = (2.25 x motor amps) + heater amps
General Sizing Rules:
•

If MOP = 15, then fuse size = 15

•

If MOP = 19, then fuse size = 15 with one exception. If heater amps x 1.25 > 15, then fuse size = 20.

•

If MOP £ MCA, then choose next fuse size greater than MCA.

•

Control fusing not applicable.

•

Standard Fuse Sizes: 15, 20, 25, 30, 35, 40, 45, 50, and 60.

Useful Formulas:
Cfm  ATDkW = ------------------------------3145
 3145ATD = kW
-----------------------------Cfm
kW
ATD = ------------------------------1214  L  s
kW = 1214  L  s  ATD
kW  1000
amps = -------------------------------------------------------------PrimaryVoltage 
kW  1000
amps = -----------------------------------------------PrimaryVoltag

Low-Height Series Fan-Powered
Minimum Circuit Ampacity (MCA) = (motor amps + heater amps) x 1.25
Maximum Overcurrent Protection (MOP) = (2.25 x motor amps) + heater amps
General Sizing Rules:
•

If MOP = 15, then fuse size = 15

•

If MOP = 19, then fuse size = 15 with one exception. If heater amps x 1.25 > 15, then fuse size = 20.

•

If MOP is less than/equal to MCA, then choose next fuse size greater than MCA.

•

Control fusing not applicable.

•

Standard Fuse Sizes: 15, 20, 25, 30, 35, 40, 45, 50, and 60.

Useful Formulas
Cfm  ATDkW = ------------------------------3145
kW  1000
3amps = ----------------------------------------------------------------PrimaryVoltage  3
 3145ATD = kW
-----------------------------Cfm
kW = 1214  Lls  ATD
kW  1000 1amps = --------------------------------------------------PrimaryVoltage
kW ATD = ----------------------------1214  Lls

VAV-PRC012-EN

75

Acoustics Data
Parallel Fan-Powered Terminal Units
Table 95. Discharge sound power (dB)1, 2, 4- valve only
0.5" Inlet Pressure 1.0" Inlet Pressure 1.5" Inlet Pressure 2.0" Inlet Pressure 3.0" Inlet Pressure
Ps5
Ps3
Ps5
Ps5
Ps5

Inlet
Fan Size
Size (in) Cfm

l/s

02SQ

118

02SQ

02SQ

02SQ

03SQ

03SQ
04SQ

5

6

8

10

6

8

250

10

5

6

7

2

3

4

5

6

7

5

6

7

2

3

4

5

6

7

2

3

4

5

6

7

60 54 54 53 51 50 63 56 57 57 56 56

60 53 49 48 44 35 62 56 54 53 50 43

64 58 57 56 54 50 66 60 61 59 57 55

400

189

62 54 49 47 42 36 67 60 58 57 54 46 67 61 59 60 57 49 68 62 60 61 58 52 69 64 63 63 60 56

500

236

64 57 53 51 47 41 70 63 60 59 55 47

71 65 64 65 62 55 73 68 66 68 65 58

350

165

56 49 46 45 40 33 60 54 51 48 46 45

63 58 56 53 52 51 65 60 59 56 55 55

520

245

61 54 50 49 44 37 64 58 55 52 50 47

66 62 60 57 55 52 68 64 63 60 58 56

700

330

66 60 55 53 49 42 68 63 60 57 54 49 69 65 63 60 57 52 70 67 65 62 59 54 72 69 67 65 62 57

900

425

70 64 59 57 52 45 73 67 64 61 57 52

74 70 69 66 62 57 76 72 71 68 65 60

550

260

63 55 52 52 49 39 67 60 57 57 55 47

71 65 62 62 59 54 73 67 65 65 62 58

820

387

66 58 56 56 54 44 71 64 61 61 59 51

76 70 67 67 65 58 78 72 70 70 67 61

1100 519

69 61 59 59 58 48 73 67 64 65 63 55 77 70 68 68 66 58 79 72 70 70 68 60 82 75 73 74 71 64

1400 661

71 65 62 62 60 51 76 70 67 67 65 57

82 75 72 73 71 63 85 78 76 76 74 67

100

47

48 45 41 37 33 30 49 46 44 39 37 39

50 48 47 43 45 47 51 48 47 45 49 53

200

94

52 48 43 40 35 29 55 51 47 44 41 40

57 53 52 48 47 48 58 55 54 50 51 54

300

142

57 51 46 43 36 32 60 56 51 47 44 40

62 59 56 52 50 49 63 60 59 55 54 54

400

189

59 53 48 44 38 34 64 59 54 50 46 42 65 61 57 53 50 46 66 63 59 55 52 49 68 64 62 58 56 54

600

283

63 59 56 50 46 44 65 61 57 53 48 46

73 68 64 61 56 52 75 70 68 64 60 56

175

83

48 45 42 39 34 30 50 47 44 41 41 42

53 49 47 45 47 49 55 50 49 48 51 53

350

165

52 48 44 41 35 31 56 52 49 46 43 41

60 57 55 52 51 51 62 58 58 54 54 55

525

248

57 53 49 47 42 34 61 57 54 51 47 42

65 61 59 56 53 51 66 63 62 58 56 56

700

330

62 57 53 51 47 40 64 60 57 55 51 45 66 63 60 57 54 49 68 65 63 60 56 52 70 67 66 62 59 57
68 64 60 59 51 46 72 68 65 63 59 53

73 70 68 67 63 57 75 72 71 69 65 60

275

130

52 48 46 44 38 32 54 51 49 47 46 47

56 54 53 51 50 49 58 56 56 54 54 53

550

260

57 52 50 47 42 35 60 57 54 51 48 43

63 62 60 57 55 54 65 64 63 60 58 56

825

389

61 56 53 50 46 39 64 61 58 56 52 46

67 66 64 60 58 53 70 69 68 64 62 59

64 60 57 54 50 43 67 64 62 59 55 49 70 67 65 62 59 53 72 69 67 64 61 56 74 71 70 67 64 60
69 66 63 59 54 48 73 70 68 64 61 55

76 74 72 69 66 60 79 77 75 73 70 64

385

182

52 48 47 41 38 34 56 52 51 46 43 41

59 57 57 52 50 48 59 59 60 55 54 53

775

366

58 53 52 49 43 37 63 59 57 54 50 47

67 65 63 59 55 52 69 67 66 61 58 55

1160 547

62 57 55 51 47 41 67 62 60 57 54 49

73 68 67 64 61 55 76 71 70 67 64 59

1550 732

65 60 58 54 50 44 70 65 63 60 57 51

525

77 71 69 67 64 58 80 75 73 71 68 62
74 68 66 64 61 55
81 75 73 71 68 62 84 79 77 75 72 66

248

55 50 48 45 41 35 59 54 53 50 48 44

63 59 59 55 53 52 64 62 62 58 56 55

1050 496

61 56 54 51 51 40 67 62 60 57 54 49

70 68 66 62 59 56 72 70 69 65 62 58

1575 743

64 59 57 54 52 44 71 65 63 60 57 52

75 72 70 67 63 59 77 75 73 70 67 62

2100 991

67 62 60 57 53 47 72 68 66 62 59 56 76 72 69 66 63 59 79 74 72 70 66 61 82 78 76 73 70 65

3200 1510 72 68 67 63 59 55 77 72 71 67 64 59

76

4

55 51 44 43 38 30 57 52 48 47 43 39

2350 1109 70 66 65 60 56 50 75 71 69 65 61 55

14

3

94

1600 755

04SQ
05SQ

2

65 57 54 53 50 47

142

1100 519

12

4

300

1640 774

03SQ
04SQ
05SQ

3

200

1050 496

03SQ
04SQ
05SQ

2

83 78 76 73 70 65 87 82 79 77 74 69

VAV-PRC012-EN

Acoustics Data

Table 95. Discharge sound power (dB)1, 2, 4- valve only (continued)
0.5" Inlet Pressure 1.0" Inlet Pressure 1.5" Inlet Pressure 2.0" Inlet Pressure 3.0" Inlet Pressure
Ps5
Ps3
Ps5
Ps5
Ps5

Inlet
Fan Size
Size (in) Cfm

l/s

2

550

260

53 49 46 43 38 31 56 54 51 49 45 41

60 60 58 54 52 54 62 63 62 58 56 54

800

378

57 53 50 46 41 34 60 58 55 52 48 42

64 63 61 57 54 53 66 66 65 61 59 56

1000 472

60 56 53 49 44 36 63 61 58 54 50 43

06SQ
07SQ

10

06SQ
07SQ

06SQ
07SQ

12

14

4

5

6

7

2

3

4

5

6

7

1100 519

2

3

4

5

6

7

3

4

5

6

7

2

3

4

5

6

7

67 65 63 60 56 52 69 68 67 64 61 57
66 65 62 58 54 49

62 59 56 52 46 39 66 64 61 57 52 46

70 68 66 62 58 53 72 70 69 66 62 58

1350 637

64 61 58 54 48 42 68 66 63 59 54 48

72 70 68 64 60 54 74 72 71 67 63 59

378

63 56 55 54 51 42 68 62 61 61 59 51

71 67 65 66 64 57 73 70 68 69 67 60

1100 519

65 57 56 54 52 43 72 65 63 63 60 53

75 71 69 70 67 60 77 74 72 73 71 64

1400 661

66 59 58 54 52 44 74 67 64 64 62 54

1600 755

79 73 71 72 70 62 81 77 74 76 74 66
78 72 69 69 67 60

1700 802

67 61 60 55 52 44 75 69 66 65 62 55

82 75 72 73 71 63 84 79 76 77 76 68

2000 944

69 63 61 55 52 46 76 70 67 65 63 55

84 77 74 74 71 64 86 81 78 78 77 69

1100 519

60 54 53 51 48 41 65 60 58 57 54 48

69 66 64 61 60 55 73 71 69 64 62 59

1600 755

64 58 56 55 52 45 69 64 62 61 58 52

74 70 68 66 64 59 77 73 71 69 67 62

2100 991

67 61 60 57 55 47 72 67 66 64 61 55 75 70 68 67 64 58 77 72 71 69 67 61 80 76 74 72 70 65

2500 1180 70 64 63 60 57 50 74 69 67 66 63 56

16

2

1200 566

800

06SQ
07SQ

3

80 74 72 71 69 63 83 77 76 74 72 66

3000 1416 73 67 66 63 60 53 77 71 69 68 65 58

83 76 74 73 71 65 87 79 78 76 74 68

1400 661

62 57 54 54 51 43 67 63 61 60 57 52

72 70 67 65 62 57 75 75 72 67 65 61

2100 991

64 60 58 56 54 46 71 66 63 62 60 55

76 73 71 69 67 62 78 76 74 72 70 65

2700 1274 67 63 61 59 56 49 73 68 66 65 62 57
2800 1321

79 74 72 71 69 64 82 78 76 75 73 68
77 71 69 68 66 61

3400 1605 70 65 64 62 58 52 75 70 68 66 64 58

82 75 74 72 70 65 86 79 77 76 74 69

4000 1888 73 68 67 64 61 55 77 72 70 68 65 60

84 77 75 74 71 66 89 80 78 77 75 70

Notes:
1. All data are measured in accordance with Industry Standard AHRI 880-2011.
2. All sound power levels, dB re: 10-12 Watts.
3. Data in this column constitute AHRI 880-2011 Standard Rating Conditions
4. Where Ps is the inlet static pressure minus discharge static.
5. Application ratings are outside the scope of the certification program.

Table 96. Radiated sound power (dB)1, 2, 4- valve only
0.5" Inlet Pressure 1.0" Inlet Pressure 1.5" Inlet Pressure 2.0" Inlet Pressure 3.0" Inlet Pressure
Ps5
Ps3
Ps5
Ps5
Ps5

Inlet
Fan Size
Size (in) Cfm

l/s

02SQ

250

118

200

94

02SQ

02SQ

5

6

8

2

3

4

5

6

7

2

3

4

5

6

7

2

3

4

5

6

7

2

3

4

5

6

7

2

3

4

5

6

7

50 48 46 42 38 30
48 40 38 35 31 25 48 44 42 37 33 26

53 48 47 43 38 33 54 50 47 44 41 37

300

142 51 45 42 35 29 24 54 49 46 39 33 26

57 51 50 44 38 32 60 55 53 48 42 37

400

189 54 48 46 38 32 25 58 53 49 42 35 26 60 54 51 44 37 29 61 55 52 47 40 33 63 57 55 49 43 37

500

236 52 50 48 40 33 27 62 56 52 45 37 29

65 59 56 50 42 34 65 60 57 52 45 38

350

165 53 45 40 37 31 23 55 49 44 39 35 30

60 53 50 45 41 36 62 55 52 48 45 40

520

245 57 49 44 40 34 26 59 53 48 42 37 31

64 57 53 47 43 38 66 59 56 51 46 41

700

330 61 53 48 43 37 29 63 57 52 46 40 33 66 59 55 48 43 39 68 61 57 50 45 40 70 63 60 54 48 42

900

425 66 58 53 47 41 33 68 62 56 50 44 37

VAV-PRC012-EN

72 65 61 53 48 42 73 67 63 56 50 44

77

Acoustics Data

Table 96. Radiated sound power (dB)1, 2, 4- valve only (continued)
Inlet
Fan Size
Size (in) Cfm

02SQ

10

0.5" Inlet Pressure 1.0" Inlet Pressure 1.5" Inlet Pressure 2.0" Inlet Pressure 3.0" Inlet Pressure
Ps5
Ps3
Ps5
Ps5
Ps5
l/s

2

3

4

5

6

7

2

3

4

5

6

7

2

3

4

5

6

7

6

8

10

4

5

6

7

74 69 63 57 50 41 77 71 66 60 53 44

47

49 44 38 37 31 24 50 46 41 41 35 29

52 47 44 46 41 36 53 48 45 48 45 40

200

94

50 44 39 37 31 24 53 48 43 41 36 29

56 51 47 46 42 36 59 53 49 49 45 40

300

142 52 45 40 38 31 25 54 50 45 42 36 30

59 53 50 47 42 37 60 55 53 49 45 40

400

189 54 47 42 39 33 26 57 53 48 44 38 31 59 55 51 46 41 35 61 55 52 48 43 38 62 57 55 50 46 41

600

283 58 53 50 45 40 34 58 56 54 48 42 35
83

64 61 58 51 45 39 67 62 60 53 48 42

52 45 39 36 33 26 54 47 42 41 36 30

57 50 45 46 42 36 59 52 46 49 45 39

350

165 57 50 43 38 33 26 59 52 46 42 37 30

61 54 50 47 43 37 63 55 52 50 46 40

525

248 58 51 45 39 34 27 61 55 48 43 38 31

64 57 53 48 44 37 66 58 56 51 47 41

700

330 60 53 47 42 36 30 63 56 51 45 39 33 64 58 53 47 42 35 66 60 55 49 44 37 68 62 58 52 48 41
72 65 60 54 48 41 74 67 63 56 50 43

275

130 55 49 43 38 34 27 57 51 45 42 37 30

58 53 48 47 43 36 59 54 50 50 46 40

550

260 59 54 47 40 34 28 61 56 50 45 39 34

63 58 53 51 45 41 64 60 56 54 51 44

825

389 61 55 49 42 36 29 63 58 53 46 40 35

66 61 57 51 46 41 69 64 60 54 50 44

1100 519 62 56 50 44 38 32 66 60 54 49 43 37 68 62 57 51 46 40 70 64 59 53 48 43 72 66 62 56 51 46

12

76 69 64 58 51 45 79 72 67 61 55 49

385

182 52 47 42 40 36 30 55 50 45 43 40 35

59 53 48 47 44 39 61 55 50 50 47 42

775

366 59 51 45 40 35 28 63 55 48 43 38 33

66 59 52 48 44 39 69 62 56 52 48 42

1160 547 63 54 47 41 35 30 67 58 51 46 39 35

72 63 56 51 45 40 75 67 60 54 49 43

1550 732 66 58 50 43 37 31 71 62 54 48 42 36

75 66 59 53 46 41 78 70 63 56 50 44
73 64 57 51 44 39

14

79 72 64 57 50 44 82 75 67 60 54 47

248 58 51 45 40 34 27 61 53 48 44 38 31

64 56 51 49 44 37 66 59 54 51 47 40

1050 496 62 56 49 42 37 30 66 59 52 46 42 34

71 63 57 51 46 39 74 66 60 54 49 42

1575 743 65 59 52 44 37 31 70 62 55 48 42 35

75 67 61 54 48 40 78 70 64 57 51 43

2100 991 67 60 54 45 38 33 72 64 58 50 43 36 75 66 60 53 46 40 78 69 63 56 49 43 83 74 68 61 54 46
3200 1510 72 66 59 51 44 38 77 70 63 55 48 42

10

83 75 68 60 53 47 86 78 71 63 56 50

550

260 51 44 42 40 37 32 54 49 45 44 42 38

58 55 49 49 48 45 61 58 52 52 52 49

800

378 53 48 43 41 37 32 57 52 47 45 42 38

62 58 52 50 48 45 65 61 55 53 52 49

1000 472 55 51 44 42 38 33 59 55 48 46 42 38
1100 519

65 61 54 51 48 45 68 63 57 54 52 49
63 59 53 49 46 42

1200 566 58 53 47 43 38 33 62 58 51 47 42 38

67 63 56 52 48 45 70 65 59 56 52 49

1350 637 60 55 49 44 39 34 64 60 53 48 43 39
800

78

3

100

525

06SQ
07SQ

2

1100 519 62 56 50 44 41 26 66 61 54 49 42 33 70 64 58 52 45 36 72 66 60 54 48 39 75 68 63 57 51 42

2350 1109 69 64 55 49 42 36 74 68 59 52 45 40

06SQ
07SQ

7

69 63 56 51 44 37 71 66 60 54 47 40

1600 755

04SQ
05SQ

6

387 59 52 46 41 34 25 64 58 52 46 40 31

1640 774 65 61 55 50 43 37 70 65 58 53 46 40

03SQ
04SQ
05SQ

5

"820

1050 496 63 59 55 49 42 35 68 62 57 51 45 38

03SQ
04SQ
05SQ

4

65 58 52 46 40 34 67 60 56 50 43 38

175
03SQ
04SQ

3

260 57 50 44 39 32 25 61 54 48 42 36 28

1400 661 65 60 53 47 44 30 68 64 57 52 45 36

03SQ

2

550

12

69 65 58 53 49 45 72 67 61 57 53 49

378 58 50 44 40 33 26 62 55 49 45 38 31

66 60 54 50 43 36 68 63 56 52 46 39

1100 519 60 52 46 40 33 27 65 58 51 47 40 33

70 64 58 53 46 39 72 66 60 56 50 42

1400 661 62 54 46 40 34 27 67 60 53 48 41 34
1600 755

73 66 60 55 48 41 75 69 64 58 52 44
73 65 58 53 46 40

1700 802 64 56 48 42 34 28 68 62 54 48 41 35

76 68 61 56 49 42 78 72 66 60 54 46

2000 944 65 58 49 47 36 31 70 63 55 50 42 35

77 70 62 57 50 43 79 73 67 61 55 48

VAV-PRC012-EN

Acoustics Data

Table 96. Radiated sound power (dB)1, 2, 4- valve only (continued)
Inlet
Fan Size
Size (in) Cfm

06SQ
07SQ

06SQ
07SQ

14

0.5" Inlet Pressure 1.0" Inlet Pressure 1.5" Inlet Pressure 2.0" Inlet Pressure 3.0" Inlet Pressure
Ps5
Ps3
Ps5
Ps5
Ps5
l/s

2

3

4

5

6

7

2

3

4

5

6

7

2

3

4

5

6

7

3

4

5

6

7

2

3

4

5

6

7

66 61 54 49 43 36 69 66 57 51 45 40

1600 755 59 53 47 42 35 27 65 59 52 48 41 33

70 64 58 53 46 39 74 68 61 55 49 42

2100 991 64 57 51 46 38 29 68 61 55 50 43 35 72 64 58 53 46 38 74 67 61 55 49 41 77 70 64 59 52 45
2500 1180 67 59 53 48 40 31 71 63 57 52 44 36

16

2

1100 519 56 49 44 40 32 25 61 55 48 44 38 30

76 68 62 56 50 42 79 72 66 60 54 46

3000 1416 71 62 56 50 42 33 74 66 59 54 46 38

78 70 64 58 51 44 82 74 68 62 56 48

1400 661 63 54 48 41 36 29 67 59 53 46 42 35

70 66 58 52 48 40 72 70 61 54 50 43

2100 991 66 57 51 44 39 32 71 63 56 49 45 38

75 69 63 56 52 44 77 72 66 59 55 47

2700 1274 68 60 54 46 41 34 73 65 59 51 47 40
2800 1321

78 72 66 59 54 47 80 75 69 62 58 50
76 69 62 55 51 44

3400 1605 70 63 57 51 46 42 76 68 61 54 48 42

81 74 68 60 56 48 83 76 70 64 59 52

4000 1888 73 66 60 56 52 50 78 70 63 56 50 45

83 75 70 62 57 50 85 78 72 65 60 53

Notes:
1. All data are measured in accordance with Industry Standard AHRI 880-2011.
2. All sound power levels, dB re: 10-12 Watts.
3. Data in this column constitute AHRI 880-2011 Standard Rating Conditions
4. Where Ps is the inlet static pressure minus discharge static.
5. Application ratings are outside the scope of the certification program.

Table 97. Fan only sound power
Discharge Lw (dB)
Fan

02SQ

03SQ

04SQ

05SQ

VAV-PRC012-EN

Outlet
SP

0.25

0.25

0.25

0.25

Radiated Lw (dB)

Octave Bands

Octave Bands

CFM

l/s

2

3

4

5

6

7

2

3

4

5

6

7

200

94

59

51

50

46

42

35

63

55

53

50

44

37

280

132

61

53

51

48

44

38

65

57

54

52

46

40

350

165

62

54

52

50

46

40

66

58

55

52

48

42

430

203

65

56

54

52

49

43

68

60

57

54

50

45

500(a)

236

66

57

55

53

50

46

69

61

58

56

52

48

250

118

57

50

51

45

40

39

61

55

53

49

42

35

400

189

60

52

53

46

42

41

64

56

55

51

45

40

610

288

67

59

57

53

48

47

70

62

60

56

51

48

850

401

69

60

60

56

52

51

72

63

62

59

55

53

1090(a)

514

74

65

65

63

58

58

77

68

66

64

60

59

300

142

59

52

52

47

41

38

61

56

54

49

43

34

530

250

60

54

55

50

45

42

63

57

56

51

47

41

790

373

66

59

59

55

50

48

69

62

60

56

52

49

1100

519

69

63

64

60

56

55

72

66

64

60

57

55

1300(a)

614

71

65

66

64

59

58

74

68

66

63

60

59

1350

637

72

66

66

65

60

59

75

69

67

64

61

60

350

165

60

53

54

46

40

37

63

57

54

48

42

35

650

307

62

56

57

50

45

42

65

60

57

51

47

43

970

458

65

61

62

57

51

50

68

63

62

57

53

51

1300

614

68

64

66

63

58

57

71

67

65

62

59

57

1550(a)

732

70

66

67

66

61

60

74

69

68

65

62

61

79

Acoustics Data

Table 97. Fan only sound power (continued)
Discharge Lw (dB)

06SQ

07SQ

06SQ ECM

Radiated Lw (dB)

920

434

66

61

60

56

51

48

71

64

62

56

51

47

1200

566

69

64

61

59

54

51

73

65

63

59

53

51

1400

661

71

65

63

61

56

54

75

67

64

60

55

53

1700

802

73

68

65

63

58

57

77

69

66

63

58

56

1960(a)

925

75

70

68

66

62

60

79

71

67

64

61

59

1050

496

62

61

61

55

49

46

67

61

62

56

50

46

1300

614

65

65

62

58

53

50

69

64

66

58

54

50

1500

708

67

67

64

61

56

53

70

65

68

60

56

52

1800

850

69

68

68

65

60

57

73

68

68

63

59

56

2020(a)

953

70

69

69

66

62

59

74

69

69

65

61

58

0.25

0.25

0.25

800

378

68

61

60

57

51

49

71

65

63

57

52

49

1100

519

71

64

62

59

54

52

73

66

64

58

54

51

1500

708

74

67

65

63

58

56

76

70

66

62

57

55

1800

850

76

69

67

66

60

58

78

72

67

64

60

58

2100

991

78

71

69

68

63

62

80

74

69

66

63

61

Notes:
1. All data are measured in accordance with Industry Standard AHRI 880-2011.
2. all sound power levels, dB re: 10-12 Watts
3. application ratings are outside the scope of the certification program
(a) AHRI 880-2011 section 7.2 Standard Rating Conditions

Table 98. Sound noise criteria (NC) - fan only
Fan-Only
0.25" Disch. Pres.
Fan

02SQ

03SQ

04SQ

05SQ

80

Outlet SP

0.25

0.25

0.25

0.25

CFM

l/s

Discharge

Radiated

200

94

--

27

280

132

--

29

350

165

--

30

430

203

17

33

500(a)

236

19

34

250

118

--

27

400

189

--

30

610

288

17

35

850

401

20

38

1090(a)

514

26

44

300

142

--

28

530

250

--

31

790

373

16

35

1100

519

21

39

1300(a)

614

23

41

1350

637

24

43

350

165

--

28

650

307

--

32

970

458

18

37

1300

614

22

40

1550(a)

732

24

44

VAV-PRC012-EN

Acoustics Data

Table 98. Sound noise criteria (NC) - fan only (continued)
Fan-Only

06SQ

07SQ

06SQ
ECM

0.25

0.25

0.25

920

434

18

37

1200

566

21

39

1400

661

23

42

1700

802

26

44

1960(a)

925

29

47

1050

496

18

37

1300

614

23

41

1500

708

25

44

1800

850

26

44

2020(a)

953

27

45

800

378

18

38

1100

519

22

39

1500

708

26

43

1800

850

29

45

2100

991

31

48

Notes:
1. “--” represents NC levels below NC 15.
2. NC values are calculated using modeling assumptions based on AHRI 885-2008 Appendix E.
3. application ratings are outside the scope of the certification program.
(a) AHRI 880-2011 section 7.2 Standard Rating Conditions

Table 99. AHRI 885-2008 discharge transfer function assumptions:
Octave Band
Small Box (<300 Cfm)

2

3

4

5

6

7

-24

-28

-39

-53

-59

-40

Medium Box (300-700 Cfm)

-27

-29

-40

-51

-53

-39

Large Box (>700 Cfm)

-29

-30

-41

-51

-52

-39

Notes: Subtract from terminal unit sound power to determine discharge sound pressure in the space.
1. NC Values are calculated using current Industry Standard AHRI 885-2008. Radiated Transfer Function obtained from Appendix E, Type 2 Mineral Fiber
Insulation.
2. Application ratings are outside the scope of the Certification Program.

Table 100.AHRI 885-2008 radiated transfer function assumptions:
Octave Band
2

3

4

5

6

7

Type 2- Mineral Fiber Insulation

-18

-19

-20

-26

-31

-36

Total dB reduction

-18

-19

-20

-26

-31

-36

Notes: Subtract from terminal unit sound power to determine discharge sound pressure in the space.
1. NC Values are calculated using current Industry Standard AHRI 885-2008. Radiated Transfer Function obtained from Appendix E, Type 2 Mineral Fiber
Insulation.
2. Application ratings are outside the scope of the Certification Program.

VAV-PRC012-EN

81

Acoustics Data

Table 101. Sound noise criteria (NC) - valve only
Discharge1,2,4
Inlet
Fan Size Size (in)
02SQ

02SQ

02SQ

02SQ

03SQ

03SQ
04SQ

03SQ
04SQ

03SQ
04SQ
05SQ

04SQ
05SQ

82

5

6

8

10

6

8

10

12

14

Inlet Pressure
CFM

l/s

0.5”

1.0”

1.5”

Radiated1,2,4

(Ps)3,5

Inlet Pressure (Ps)3,5

2.0”

3.0”

0.5”

1.0”

21

1.5”

2.0”

3.0”

250

118

200

94

--

--

--

20

--

15

21

21

300

142

--

--

16

19

15

20

24

27

400

189

--

20

21

23

20

23

26

30

500

236

16

23

25

28

22

26

31

32

350

165

--

--

16

19

--

18

24

26

520

245

--

16

21

23

19

22

27

31

700

330

18

22

26

29

24

26

33

35

900

425

23

27

30

32

30

33

38

39

550

260

--

17

23

25

19

24

29

31

29

31

21

27

34

37

32

36

25

31

38

42

20

24

20

25

30

820

387

16

22

1100

519

20

25

1400

661

23

29

36

40

30

34

40

44

100

47

--

--

--

17

--

--

18

20

200

94

--

--

--

18

--

16

21

23

300

142

--

--

17

18

--

19

24

27

400

189

--

17

22

23

15

22

26

30

175

83

--

--

--

17

--

15

19

21

350

165

--

--

--

19

19

21

24

26

525

248

--

--

19

22

20

24

27

31

24

26

22

26

30

33

30

32

30

33

38

40

30

19

22

35

25

700

330

--

18

1050

496

23

28

275

130

--

--

--

17

17

19

22

24

550

260

--

--

19

22

23

25

27

31

24

28

24

27

32

35

28

30

25

30

825

389

--

18

1100

519

17

22

1640

774

24

29

34

37

31

385

182

--

--

--

17

25

27

33

35

38

36

43

47

15

19

22

24

775

366

--

16

23

25

21

26

30

34

1160

547

--

19

26

30

26

31

38

42

1550

732

17

23

30

35

30

36

42

45

1600

755

2350

1109

24

30

35

40

34

40

47

51

525

248

--

--

16

19

20

24

27

30

1050

496

--

19

26

29

25

30

36

40

1575

743

16

23

31

35

29

35

42

45

2100

991

19

26

3200

1510

26

31

26

31

39

34

38

31

38

38

43

38

44

42

45

52

52

56

VAV-PRC012-EN

Acoustics Data

Table 101. Sound noise criteria (NC) - valve only (continued)
Discharge1,2,4

06SQ
07SQ

06SQ
07SQ

06SQ
07SQ

06SQ
07SQ

10

12

14

16

550

260

--

Radiated1,2,4

--

18

20

15

19

24

27

800

378

--

--

20

24

16

21

27

31

1000

472

--

18

23

26

19

24

31

33

1100

519

1200

566

16

33

36

1350

637

18

24

29

31

24

30

36

38

800

378

--

19

25

29

20

25

30

33

1100

519

15

24

30

33

22

29

35

38

1400

661

16

27

33

37

25

31

39

42

1600

755

1700

802

18

28

37

39

27

33

43

45

2000

944

20

29

39

42

29

35

44

47

1100

519

--

17

24

30

18

24

31

37

1600

755

--

21

29

32

21

29

35

40

2100

991

18

25

31

36

27

33

2500

1180

21

27

34

38

31

3000

1416

25

30

38

43

1400

661

--

20

29

2100

991

17

24

32

2700

1274

20

26

33

2800

1321

3400

1605

23

29

37

42

35

4000

1888

26

31

39

46

39

23

28

21

26

29

21

27

32

39

29

38

40

44

36

43

47

36

40

45

51

35

26

31

37

42

36

30

36

42

44

38

33

39

45

48

43

49

52

45

52

54

30

43

Notes:
1. “--” represents NC levels below NC 15.
2. NC Values are calculated using modeling assumptions based on AHRI 885-98-02 Addendum
3. Data at 1.5” inlet pressure constitute AHRI 880-2011 Standard Rating Conditions.
4. Where Ps is the inlet static pressure minus discharge static.
5. Data at 0.5”, 1.0”, 2.0” and 3.0” are application ratings. These ratings are outside the scope of the certification program.

Table 102. Parallel inlet attenuator appurtenance effects (fan noise only)
Discharge Sound Effect* (dB)
Fan

2

3

4

5

Radiated Sound Effect* (dB)

6

7

2

3

4

5

6

7

Matte-faced and foil-faced insulation, solid double-wall**
02SQ
03SQ, 04SQ, 05SQ
06SQ, 07SQ

2
2
2

1
1
1

1
1
1

2
2
2

1
1
1

2
2
2

1
0
1

-2
-1
0

-8
-8
-8

-13
-12
-12

-15
-16
-15

-16
-17
-18

1
1
1

1
1
1

1
1
1

1
1
1

1
1
1

1
1
1

1
0
1

-1
-1
-1

-3
-3
-3

-2
-2
-2

-4
-4
-4

-4
-4
-4

Closed-cell insulation
02SQ
03SQ, 04SQ, 05SQ
06SQ, 07SQ

Notes:
* Add to sound power, a negative effect represents a sound reduction, a positive effect represents a sound increase.
** Note- Attenuators on double-wall units contain foil-faced insulation.
1. All data are measured in accordance with Industry Standard AHRI 880-2011.
2. All sound power levels, dB re: 10-12 Watts.
3. Application ratings are outside the scope of the Certification Program.

VAV-PRC012-EN

83

Acoustics Data

Table 103. Parallel cabinet lining appurtenance effects (fan noise and valve noise)
Discharge Sound Effect* (dB)
Fan

Radiated Sound Effect* (dB)

2

3

4

5

6

7

2

3

4

5

6

7

3
1
3

1
-1
1

1
1
1

-1
3
1

1
4
3

3
5
5

1
1
-1

0
0
-1

0
2
-1

1
5
2

4
8
4

7
8
5

1
1
1

1
1
1

1
2
2

0
2
1

1
2
2

4
3
4

0
1
1

0
2
0

2
4
3

2
4
4

5
4
5

7
5
6

Solid double-wall
02SQ
03SQ, 04SQ, 05SQ
06SQ, 07SQ

Closed-cell insulation
02SQ
03SQ, 04SQ, 05SQ
06SQ, 07SQ

Note:
* Add to sound power, a negative effect represents a sound reduction, a positive effect represents a sound increase
1. All data are measured in accordance with Industry Standard AHRI 880-2011.
2. All sound power levels, dB re: 10-12 Watts.
3. Application ratings are outside the scope of the Certification Program.

Table 104. Parallel heating coil appurtenance effects
Discharge Sound Effect* (dB)
Fan

Radiated Sound Effect* (dB)

2

3

4

5

6

7

2

3

4

5

6

7

-1
2
2

0
2
1

-1
2
0

-1
2
-1

0
2
0

-1
1
0

-1
1
0

-1
1
0

0
1
0

-1
1
-1

-1
0
0

-3
0
-1

0
0
3

0
0
4

0
0
3

-1
0
2

-2
0
4

-1
1
4

0
0
1

0
0
0

0
0
0

0
0
0

0
0
0

0
0
0

Hot Water Coil**
02SQ
03SQ, 04SQ, 05SQ
06SQ, 07SQ

Electric Heat***
02SQ
03SQ, 04SQ, 05SQ
06SQ, 07SQ

Notes:
* Add to sound power, a negative effect represents a sound reduction, a positive effect represents a sound increase.
** Add to fan sound only, not valve sound.
***Add to both fan sound and valve sound.
Apply fan only data, not valve sound.
1. All data are measured in accordance with Industry Standard AHRI 880-2011.
2. All sound power levels, dB re: 10-12 Watts.
3. Application ratings are outside the scope of the Certification Program.

84

VAV-PRC012-EN

Acoustics Data

Series Fan-Powered Terminal Units
Table 105. Discharge sound power (dB)- fan and 100% primary
0.5” Inlet Pressure Ps 1.0” Inlet Pressure Ps 2.0” Inlet Pressure Ps 3.0” Inlet Pressure Ps

Fan
Inlet
Size Size (in) Cfm

l/s

2

3

4

5

6

7

2

3

4

5

6

7

2

3

4

5

6

7

2

3

4

5

6

7

200

94

71

55

54

52

49

45

72

61

56

54

52

51

74

70

66

62

59

55

74

64

63

61

59

59

300

142

71

56

55

52

49

46

72

61

57

54

52

52

74

69

65

61

58

56

75

67

66

63

60

60

500

236

71

57

56

52

49

47

72

61

58

54

52

53

74

68

64

60

57

59

76

74

73

67

63

63

600

283

72

60

59

55

52

50

74

63

60

56

54

55

75

67

64

60

58

59

76

72

69

64

61

62

700

330

73

62

61

57

55

53

75

64

61

58

56

56

75

66

63

59

58

58

76

69

64

61

59

60

250

118

57

49

47

43

38

34

57

50

48

43

39

34

58

52

48

44

40

36

59

53

48

45

41

39

480

227

61

53

52

49

45

43

62

55

53

49

46

43

63

57

53

49

46

44

64

59

53

50

47

45

720

340

66

58

58

55

53

52

68

60

59

56

54

52

68

63

58

55

53

52

70

65

59

55

53

52

960

453

71

63

63

61

59

59

72

64

63

62

59

59

74

67

64

62

60

60

74

68

64

62

60

59

02SQ

03SQ

04SQ

05SQ

06SQ

07SQ

04SQ
ECM

10

10

12

12

16

16

12

VAV-PRC012-EN

1200

566

76

67

67

66

64

65

77

68

67

66

64

64

79

71

68

67

65

65

79

72

68

68

65

65

330

156

58

52

49

45

39

34

59

53

49

45

40

35

62

57

50

46

40

38

63

59

51

46

42

40

620

293

62

55

54

51

46

43

63

57

54

51

47

44

67

62

55

52

47

46

68

64

55

52

48

47

930

439

66

59

59

57

54

53

68

61

59

57

55

53

72

67

60

58

55

54

73

69

60

58

55

54

1250

590

72

64

64

63

60

60

74

66

65

64

61

61

76

69

65

65

62

62

78

72

66

65

63

62

1550

732

77

69

68

68

66

66

77

70

68

69

66

66

80

72

69

70

67

67

81

75

70

70

68

67

400

189

56

52

52

46

40

38

57

53

52

47

41

39

59

54

52

47

42

40

60

56

53

48

43

41

760

359

61

58

58

54

49

48

62

58

57

54

49

48

65

60

57

53

49

48

66

62

58

54

50

48

1140

538

67

64

64

62

59

58

67

63

63

61

58

57

71

66

63

60

57

56

73

69

64

61

58

56

1500

708

73

69

69

68

65

64

73

69

69

67

65

64

75

70

69

68

65

64

77

72

69

68

65

64

1900

897

77

74

73

74

71

71

78

74

73

74

71

70

79

74

73

73

70

70

79

75

73

73

70

70

700

330

57

53

53

49

46

41

70

59

55

52

51

50

75

71

65

62

56

56

78

71

69

65

60

58

1200

566

63

59

58

55

52

48

72

63

60

57

55

54

77

72

67

64

60

60

80

75

71

67

64

62

1600

755

69

63

62

59

56

54

74

67

64

61

59

58

79

74

69

66

62

62

82

77

73

69

66

64

2100

991

75

69

67

65

62

61

77

71

69

66

63

62

81

76

72

69

66

66

84

80

75

72

70

68

2500

1180

77

72

69

67

65

64

79

74

71

69

66

65

83

78

74

71

69

68

86

82

77

74

72

70

850

401

62

58

51

53

47

51

66

60

53

54

47

52

69

63

56

56

52

58

75

69

62

59

54

63

1400

661

65

61

59

56

52

53

69

63

61

57

55

57

74

68

64

59

57

61

77

72

67

62

59

63

1900

897

69

66

65

61

58

57

73

67

66

61

59

60

77

71

68

63

61

63

80

75

70

65

63

64

2250

1062

72

69

68

64

62

61

75

70

69

64

62

62

79

73

71

65

64

65

82

77

72

67

65

66

2500

1180

74

71

71

67

65

63

76

72

71

67

65

65

79

74

73

67

66

67

83

77

73

69

67

67

3000

1416

77

75

75

71

69

68

79

75

75

71

69

69

81

77

76

71

70

70

85

79

76

72

70

70

275

130

56

51

49

44

38

37

57

52

49

44

38

38

58

53

49

44

39

39

59

55

50

45

41

40

620

293

61

55

54

51

46

45

63

57

54

51

47

46

65

60

55

51

47

47

66

62

55

52

48

47

930

439

66

59

59

57

54

53

68

61

59

57

55

53

72

67

60

58

55

54

73

69

60

58

55

54

1250

590

72

64

64

63

60

60

74

66

65

64

61

61

76

69

65

65

62

62

78

72

66

65

63

62

1550

732

77

69

68

68

66

66

77

70

68

69

66

66

80

72

69

70

67

67

81

75

70

70

68

67

1660

783

79

71

69

70

68

68

78

71

69

71

68

68

81

73

70

72

69

69

82

76

71

72

70

69

85

Acoustics Data

Table 105. Discharge sound power (dB)- fan and 100% primary (continued)
0.5” Inlet Pressure Ps 1.0” Inlet Pressure Ps 2.0” Inlet Pressure Ps 3.0” Inlet Pressure Ps

Fan
Inlet
Size Size (in) Cfm

l/s

2

3

4

5

6

7

2

3

4

5

6

7

2

3

4

5

6

7

2

3

4

5

6

7

350

165

57

51

50

45

39

39

57

52

50

45

40

39

57

53

49

46

40

40

59

54

50

47

42

41

760

359

62

58

57

54

49

49

62

58

57

53

49

48

64

60

56

53

49

48

66

62

57

54

50

49

1140

538

67

64

64

62

59

58

67

63

63

61

58

57

71

66

63

60

57

56

73

69

64

61

58

56

1500

708

73

69

69

68

65

64

73

69

69

67

65

64

75

70

69

68

65

64

77

72

69

68

65

64

1900

897

77

74

73

74

71

71

78

74

73

74

71

70

79

74

73

73

70

70

79

75

73

73

70

70

2350

1109

81

78

77

78

76

76

82

78

77

78

76

76

83

79

77

78

76

76

83

79

77

78

76

76

700

330

57

53

53

49

46

41

70

59

55

52

51

50

75

71

65

62

56

56

78

71

69

65

60

58

1200

566

63

59

58

55

52

48

72

63

60

57

55

54

77

72

67

64

60

60

80

75

71

67

64

62

1600

755

69

63

62

59

56

54

74

67

64

61

59

58

79

74

69

66

62

62

82

77

73

69

66

64

2100

991

75

69

67

65

62

61

77

71

69

66

63

62

81

76

72

69

66

66

84

80

75

72

70

68

2500

1180

77

72

69

67

65

64

79

74

71

69

66

65

83

78

74

71

69

68

86

82

77

74

72

70

1500

708

75

74

70

68

64

63

76

74

70

69

64

63

05SQ
ECM

06SQ
ECM

14

16

Notes:
1. All data are measured in accordance with Industry Standard AHRI 880-2011.
2. All sound power levels, dB re: 10-12 Watts.
3. Where Ps is the inlet static pressure minus discharge static.
4. Application ratings are outside the scope of the certification program.

Table 106. Radiated sound power (dB)1,2,4- fan and 100% primary
Inlet
Fan Size
Size (in) Cfm

02SQ

03SQ

10

10

0.5” Inlet Pressure 1.0” Inlet Pressure 1.5” Inlet Pressure 2.0” Inlet Pressure 3.0” Inlet Pressure
Ps5
Ps3
Ps5
Ps5
Ps5
l/s

2

3

4

5

6

7

2

3

4

5

6

7

200

94

65 53 53 52 49 45 66 59 55 54 52 51

68 68 65 62 59 55 68 62 62 61 59 59

300

142

65 54 54 52 49 46 66 59 56 54 52 52

68 67 64 61 58 56 69 65 65 63 60 60

500

236

65 55 55 52 49 47 66 59 57 54 52 53

68 66 63 60 57 59 70 72 72 67 63 63

600

283

66 58 58 54 52 50 68 60 58 56 54 54

69 66 63 60 58 60 71 72 70 66 62 63

700

330

67 60 60 57 55 53 69 62 60 58 56 56 69 64 61 59 57 58 70 67 63 61 59 60 72 71 68 66 62 63

250

118

53 49 47 44 40 35 56 51 49 47 44 42

58 54 53 52 49 48 59 56 56 55 52 52

480

227

58 54 52 49 45 42 61 56 53 51 48 48

63 59 57 55 52 53 65 62 60 58 55 56

720

340

63 59 57 54 51 50 66 61 58 55 53 54

69 65 61 58 56 59 71 68 64 61 58 61

960

453

68 63 61 59 57 57 71 65 63 60 58 59

1100 519
1200 566

04SQ

12

86

4

5

6

7

2

3

4

5

6

7

2

3

4

5

6

7

73 69 65 62 59 62 74 71 68 64 61 63

72 67 65 63 61 62 75 69 66 64 62 63

77 72 68 66 63 65 78 74 70 67 64 66

330

156

56 51 49 44 41 37 58 54 52 47 46 47

62 58 56 53 51 53 64 60 59 57 54 56

620

293

60 55 54 49 46 44 62 58 55 51 50 51

67 63 60 56 54 57 69 65 63 60 57 60

930

439

64 60 59 54 52 51 67 62 59 55 54 56

73 68 64 59 58 62 74 71 67 63 60 65

1250 590

69 65 63 59 58 57 72 66 64 60 59 60

1550 732

12

3

74 69 66 63 61 63

1500 708

05SQ

2

76 71 66 62 61 65 78 74 69 65 63 67
77 71 68 65 64 65

74 69 67 65 63 63 76 71 68 65 64 64

79 73 69 66 65 67 80 76 72 68 66 68

400

189

57 54 50 45 44 40 60 56 53 49 50 50

63 60 57 53 52 55 65 62 60 57 54 57

760

359

61 58 55 51 50 47 64 60 57 53 54 54

68 64 60 56 55 59 70 67 64 60 57 61

1140 538

65 63 60 57 56 54 68 65 61 58 58 58

73 69 64 60 59 63 75 73 68 63 61 65

1500 708

69 67 65 63 62 60 72 69 65 63 62 62

76 72 68 64 63 65 78 75 70 66 65 67

1900 897

74 72 69 68 67 66 76 73 70 69 67 67 76 73 70 68 67 67 79 75 71 68 67 68 81 77 72 69 68 69

VAV-PRC012-EN

Acoustics Data

Table 106. Radiated sound power (dB)1,2,4- fan and 100% primary (continued)
0.5” Inlet Pressure 1.0” Inlet Pressure 1.5” Inlet Pressure 2.0” Inlet Pressure 3.0” Inlet Pressure
Ps5
Ps3
Ps5
Ps5
Ps5

Inlet
Fan Size
Size (in) Cfm

l/s

2

700

330

54 52 53 49 46 41 67 58 55 52 51 50

72 70 65 62 56 56 75 70 69 65 60 58

1200 566

60 58 58 55 52 48 69 62 60 57 55 54

74 71 67 64 60 60 77 74 71 67 64 62

1600 755

66 62 62 59 56 54 71 66 64 61 59 58

76 73 69 66 62 62 79 76 73 69 66 64

2100 991

72 68 67 65 62 61 74 70 68 66 63 62

78 74 72 69 66 66 81 79 75 72 70 68

06SQ

16

3

4

5

6

7

2

3

4

5

6

7

2

3

4

5

6

7

2

3

4

5

6

7

2

3

4

5

6

7

2500 1180 74 71 69 67 65 64 76 73 70 69 66 65 78 75 72 70 68 67 80 76 74 71 69 68 83 81 77 74 72 70
850

07SQ

16

401

59 57 51 53 47 51 63 59 53 54 47 52

66 62 56 56 52 58 72 68 62 59 54 63

1400 661

62 60 59 56 52 53 66 62 61 57 55 57

71 67 64 59 57 61 74 71 67 62 59 63

1900 897

66 65 65 61 58 57 70 66 66 61 59 60

74 70 68 63 61 63 77 74 70 65 63 64

2250 1062 69 68 68 64 62 60 72 69 69 64 62 62

75 72 71 65 64 65 79 75 72 67 65 66

2500 1180 71 70 71 67 65 63 73 71 71 67 65 65

76 73 73 67 66 67 80 76 73 69 67 67

2800 1321

76 74 74 69 68 68

3000 1416 74 74 75 71 69 68 76 74 75 71 69 69

04SQ
ECM

05SQ
ECM

12

14

130

56 52 49 44 41 38 59 54 52 47 46 47

62 58 56 53 51 52 64 60 59 56 54 56

620

293

60 56 54 49 47 45 63 58 56 51 50 52

68 63 60 56 55 57 69 66 63 60 57 61

930

439

64 60 59 54 52 51 67 62 59 55 54 56

73 68 64 59 58 62 74 71 67 63 60 65

1250 590

69 65 63 59 58 57 72 66 64 60 59 60

76 71 66 62 61 65 78 74 69 65 63 67

1550 732

74 69 67 65 63 63 76 71 68 65 64 64

79 73 69 66 65 67 80 76 72 68 66 68

1660 783

76 70 68 67 65 65 77 73 69 67 66 65

80 74 70 67 66 68 81 77 73 69 67 68

350

165

53 50 48 46 42 38 55 52 50 48 46 47

57 55 54 53 51 51 60 58 57 56 54 55

760

359

58 56 54 51 49 46 61 58 56 53 51 52

64 61 59 57 55 57 66 64 62 59 58 60

1140 538

63 62 60 56 55 53 66 63 61 57 56 57

71 67 63 60 59 62 72 70 66 62 61 64

1500 708

69 67 65 62 61 60 70 67 65 62 62 61

72 68 66 63 62 63 73 70 66 64 63 65

1900 897

73 71 69 68 66 66 74 71 69 67 66 66

76 73 69 68 67 68 77 75 71 68 67 69

2350 1109 75 74 72 72 71 71 77 75 72 72 71 71
700
06SQ
ECM

16

78 76 76 71 70 70 82 78 76 72 70 70

275

79 77 73 72 72 72 81 78 74 73 72 73

330

54 52 53 49 46 41 67 58 55 52 51 50

72 70 65 62 56 56 75 70 69 65 60 58

1200 566

60 58 58 55 52 48 69 62 60 57 55 54

74 71 67 64 60 60 77 74 71 67 64 62

1600 755

66 62 62 59 56 54 71 66 64 61 59 58

76 73 69 66 62 62 79 76 73 69 66 64

2100 991

72 68 67 65 62 61 74 70 68 66 63 62

78 74 72 69 66 66 81 79 75 72 70 68

2500 1180 74 71 69 67 65 64 76 73 70 69 66 65

80 76 74 71 69 68 83 81 77 74 72 70

Notes:
1. All data are measured in accordance with Industry Standard AHRI 880-2011.
2. All sound power levels, dB re: 10-12 Watts.
3. Data in this column constitute AHRI 880-2011 Standard Rating Conditions.
4. Where Ps is the inlet static pressure minus discharge static.
5. Application ratings are outside the scope of the certification program.

VAV-PRC012-EN

87

Acoustics Data

Table 107. Fan only sound power (dB)
Discharge Lw (dB)
Fan

02SQ

03SQ

04SQ

05SQ

06SQ

07SQ

03SQ
ECM

88

Outlet
SP

0.25

0.25

0.25

0.25

0.25

0.25

0.25

Radiated Lw (dB)

Octave Bands
CFM

Octave Bands

l/s

2

3

4

5

6

7

2

3

4

5

6

7

200

94

64

53

52

46

41

33

56

49

47

43

36

28

300

142

65

52

51

47

42

34

57

48

48

44

39

32

500

236

70

58

56

54

50

47

61

56

54

50

47

43

600

283

73

61

59

57

53

52

64

59

57

53

50

48

690(a)

326

76

64

61

59

56

55

66

61

59

56

53

51

700

330

76

64

61

60

56

55

66

62

60

56

53

51

250

118

57

50

48

45

40

34

52

49

47

43

37

28

480

227

60

52

54

49

45

41

55

52

51

47

42

39

720

340

64

56

58

54

52

51

60

57

56

53

50

49

960

453

71

62

63

61

59

58

67

63

61

59

56

56

1100(a)

519

74

65

65

64

62

62

70

65

64

61

59

60

1200

566

76

67

67

67

64

64

73

67

65

63

61

62

330

156

58

51

48

45

40

34

56

51

48

42

37

30

620

293

61

54

53

51

47

44

59

54

53

47

44

40

930

439

66

59

59

58

54

53

63

58

58

53

51

49

1250

590

74

66

65

65

62

61

69

64

63

59

58

56

1500(a)

708

77

70

68

68

65

65

74

68

66

63

62

61

1550

732

78

71

68

69

66

66

75

69

66

64

63

62

400

189

58

54

52

48

42

39

54

52

51

44

40

33

760

359

62

57

56

54

50

48

58

56

53

49

47

43

1140

538

68

63

64

62

59

58

63

62

60

57

55

52

1500

708

73

69

69

68

65

65

69

67

64

62

60

59

1900

897

78

73

73

73

70

70

73

71

68

67

66

65

700

330

57

56

52

50

44

39

58

55

52

47

41

34

1200

566

59

58

57

55

51

49

60

58

58

51

47

44

1600

755

64

62

62

61

57

56

63

62

62

57

53

51

2100

991

69

67

67

67

64

64

68

67

66

62

60

59

2500(a)

1180

73

71

71

71

69

69

72

71

69

66

64

63

850

401

57

61

53

50

45

41

55

56

52

48

41

36

1400

661

63

67

59

56

54

54

59

62

58

54

50

48

1900

897

68

69

65

62

60

61

63

64

64

60

56

55

2250

1062

71

72

69

66

64

65

66

67

68

64

61

59

2500

1180

73

74

72

69

67

68

69

69

70

66

64

62

2800(a)

1321

75

75

74

72

69

70

70

71

71

68

66

65

3000

1416

76

76

76

73

71

72

71

72

72

70

68

67

200

94

56

49

47

44

38

37

51

48

48

42

35

34

480

227

58

51

53

48

45

43

53

50

51

46

42

40

720

340

64

56

57

54

52

51

57

55

55

51

49

47

960

453

71

63

63

62

59

59

67

62

61

59

56

56

1175

555

76

67

67

66

63

63

70

66

64

62

60

60

VAV-PRC012-EN

Acoustics Data

Table 107. Fan only sound power (dB)

Fan

04SQ
ECM

05SQ
ECM

06SQ
ECM

Outlet
SP

0.25

0.25

0.25

Discharge Lw (dB)

Radiated Lw (dB)

Octave Bands

Octave Bands

CFM

l/s

2

3

4

5

6

7

2

3

4

5

6

7

275

130

56

51

48

45

39

37

52

49

48

42

37

35

620

293

60

54

55

51

48

47

55

52

52

48

45

43

930

439

63

59

59

57

55

55

59

58

58

54

53

52

1250

590

70

65

65

65

63

63

65

64

64

61

60

59

1550

732

76

71

69

69

67

68

68

67

67

65

64

63

1660

783

78

73

70

70

68

70

69

68

68

66

65

64

350

165

57

52

50

46

40

39

52

49

47

43

38

34

760

359

60

55

55

52

49

48

56

52

51

48

46

43

1140

538

65

61

62

60

57

57

61

59

58

55

54

52

1500

708

72

67

68

66

64

64

67

65

63

61

61

60

1900(a)

897

77

72

72

72

70

70

72

70

68

67

66

66

2350

1109

82

77

76

77

75

76

76

75

72

71

71

71

700

330

56

52

53

51

45

44

56

50

50

46

43

36

1200

566

60

57

57

55

50

49

57

54

55

51

48

45

1600

755

63

61

61

59

55

55

60

57

60

56

52

51

2100

991

69

67

67

66

62

63

66

63

64

62

59

58

2500(a)

1180

73

71

70

70

66

67

70

67

68

66

63

62

Notes:
1. All data are measured in accordance with Industry Standard AHRI 880-2011.
2. all sound power levels, dB re: 10-12 Watts
3. application ratings are outside the scope of the certification program
(a) xAHRI 880-2011 section 7.2 Standard Rating Conditions

Table 108. Sound noise criteria (NC) fan and 100% primary
Fan
Size

02SQ

03SQ

04SQ

Inlet
Size
(in)

10

10

12

VAV-PRC012-EN

Discharge

Radiated

Inlet Pressure (Ps)

Inlet Pressure (Ps)

CFM

l/s

0.5”

1.0”

2.0”

3.0”

0.5”

1.0”

2.0”

3.0”

200

94

25

26

30

28

29

30

1.5”

40

37

300

142

25

26

29

30

29

31

39

40

500

236

25

26

28

35

30

32

38

48

600

283

26

28

30

32

33

33

38

46

700

330

27

30

30

31

35

35

38

44

250

118

--

--

--

--

21

23

27

31

480

227

--

--

--

16

26

27

32

35

720

340

16

18

21

23

32

33

36

39

960

453

23

24

26

27

36

38

40

44

1100

519

36

41

1200

566

29

30

33

33

40

42

44

46

330

156

--

--

--

16

23

26

31

34

620

293

--

--

19

22

28

30

35

38

930

439

17

18

25

28

34

34

39

43

1250

590

24

26

29

31

38

39

43

46

1500

708

1550

732

47

49

44
30

30

34

35

43

44

89

Acoustics Data

Table 108. Sound noise criteria (NC) fan and 100% primary (continued)
Fan
Size

05SQ

06SQ

07SQ

04SQ
ECM

05SQ
ECM

06SQ
ECM

Inlet
Size
(in)

12

16

16

12

14

16

Discharge

Radiated

Inlet Pressure (Ps)

Inlet Pressure (Ps)

CFM

l/s

0.5”

1.0”

2.0”

3.0”

0.5”

1.0”

2.0”

3.0”

400

189

--

--

--

--

24

27

1.5”

32

35

760

359

--

--

17

19

30

32

35

39

1140

538

22

21

24

27

35

36

40

45

1500

708

28

28

29

31

40

40

44

47

1900

897

34

33

33

35

45

46

700

330

--

21

30

32

27

1200

566

15

24

31

34

1600

755

20

26

33

37

2100

991

28

30

36

2500

1180

31

33

850

401

--

1400

661

1900

897

2250

46

47

50

31

42

45

33

35

43

47

37

39

45

49

40

43

44

48

52

38

43

45

46

17

22

28

26

18

21

26

31

24

25

30

34

1062

27

28

33

2500

1180

30

31

33

2800

1321

3000

1416

34

34

37

41

51

51

52

52

275

130

--

--

--

--

23

26

31

34

620

293

--

--

17

19

28

31

35

38

930

439

17

18

25

28

34

34

39

43

1250

590

24

26

29

31

38

39

43

46

1550

732

30

30

34

35

43

44

47

49

1660

783

33

31

35

36

44

45

48

50

350

165

--

--

--

--

22

24

28

32

48

50

55

28

32

39

34

36

39

43

40

41

44

46

37

44

45

47

48

38

47

47

49

49

50

760

359

--

--

17

19

28

31

34

37

1140

538

22

21

24

27

35

36

38

42

1500

708

28

28

29

31

40

40

41

42

1900

897

34

33

33

35

45

45

45

47

2350

1109

39

39

39

39

48

48

50

51

700

330

--

21

30

32

27

31

42

45

1200

566

15

24

31

34

33

35

43

47

1600

755

20

26

33

37

37

39

45

49

2100

991

28

30

36

40

43

44

48

52

2500

1180

31

33

38

43

45

46

50

55

Notes:
1. “--” represents NC levels below NC 15.
2. NC Values are calculated using modeling assumptions based on AHRI 885-98-02 Addendum
3. Data at 1.5” inlet pressure constitute AHRI 880-2011 Standard Rating Conditions.
4. Where Ps is the inlet static pressure minus discharge static.
5. Data at 0.5”, 1.0”, 2.0” and 3.0” are application ratings. These ratings are outside the scope of the certification program.

Table 109. AHRI 885-2008 discharge transfer function assumptions:
Octave Band
Small Box (<300 Cfm)
Medium Box (300-700 Cfm)
Large Box (>700 Cfm)

2

3

4

5

6

7

-24
-27
-29

-28
-29
-30

-39
-40
-41

-53
-51
-51

-59
-53
-52

-40
-39
-39

Notes: Subtract from terminal unit sound power to determine discharge sound pressure in the space.
1. NC Values are calculated using modeling assumptions based on AHRI 885-2008.
2. Where DPs is inlet static pressure minus discharge static pressure.
3. Application ratings are outside the scope of the Certification Program.

90

VAV-PRC012-EN

Acoustics Data

Table 110. AHRI 885-2008 radiated transfer function assumptions:
Octave Band
Type 2- Mineral Fiber Insulation
Total dB reduction

2

3

4

5

6

7

-18
-18

-19
-19

-20
-20

-26
-26

-31
-31

-36
-36

Notes: Subtract from terminal unit sound power to determine radiated sound pressure in the space.
1. NC Values are calculated using modeling assumptions based on AHRI 885-2008.
2. Where DPs is inlet static pressure minus discharge static pressure.
3. Application ratings are outside the scope of the Certification Program.

Table 111. Series inlet attenuator appurtenance effects
Discharge Sound Effect* (dB)
Fan

2

3

4

5

Radiated Sound Effect* (dB)

6

7

2

3

4

5

6

7

Matte-faced and foil-faced insulation, solid double-wall**
02SQ
03SQ, 04SQ, 05SQ
06SQ, 07SQ

2
2
2

2
2
2

2
2
2

3
3
3

3
3
3

2
2
2

-3
-1
1

-3
-3
-3

-9
-10
-8

-10
-14
-9

-12
-17
-8

-17
-20
-10

2
2
2

2
2
2

2
2
2

3
3
3

3
3
3

2
2
2

1
1
1

-2
-2
-2

-5
-5
-5

-4
-4
-4

-6
-6
-6

-6
-6
-6

Closed-cell insulation
02SQ
03SQ, 04SQ, 05SQ
06SQ, 07SQ

Notes:
* Add to sound power, a negative effect represents a sound reduction, a positive effect represents a sound increase.
** Note – Attenuators on double-wall units contain foil-faced insulation.
1. All data are measured in accordance with Industry Standard AHRI 880-2011.
2. All sound power levels, dB re: 10-12 watts.
3. Application ratings are outside the scope of the Certification Program.

Table 112. Series cabinet lining appurtenance effects
Discharge Sound Effect* (dB)
Fan

Radiated Sound Effect* (dB)

2

3

4

5

6

7

2

3

4

5

6

7

0
0
0

0
0
0

0
0
0

0
0
0

0
0
0

0
0
0

0
0
1

0
0
3

0
1
2

2
2
5

3
3
8

3
4
8

0
0
0

0
0
0

0
0
0

0
0
0

0
0
0

0
0
0

-1
1
1

-1
1
5

0
2
3

1
2
4

1
2
6

2
2
6

Solid double-wall
02SQ
03SQ, 04SQ, 05SQ
06SQ, 07SQ

Closed-cell insulation
02SQ
03SQ, 04SQ, 05SQ
06SQ, 07SQ

Note:
* Add to sound power, a negative effect represents a sound reduction, a positive effect represents a sound increase.
1. All data are measured in accordance with Industry Standard AHRI 880-2011.
2. All sound power levels, dB re: 10-12 watts.
3. Application ratings are outside the scope of the Certification Program.

Table 113. Series heating coil appurtenance effects
Discharge Sound Effect* (dB)
Fan

Radiated Sound Effect* (dB)**

2

3

4

5

6

7

2

3

4

5

6

7

1
1
2

2
3
6

2
1
4

1
2
4

2
2
4

2
1
3

2
0
6

2
2
5

2
1
2

2
2
2

2
2
2

2
2
3

-4
2
4

-1
1
4

0
2
2

0
1
2

1
-1
3

0
-1
1

-1
0
2

0
1
3

-1
1
3

0
1
4

0
1
3

0
1
2

Hot Water Coil
02SQ
03SQ, 04SQ, 05SQ
06SQ, 07SQ

Electric Heat
02SQ
03SQ, 04SQ, 05SQ
06SQ, 07SQ

Notes:
* Add to sound power, a negative effect represents a sound reduction, a positive effect represents a sound increase.
** Radiated effect applies to “fan only” sound only. Do not apply to fan + valve sound.
1. All data are measured in accordance with Industry Standard AHRI 880-2011.
2. All sound power levels, dB re: 10-12 Watts.
3. Application ratings are outside the scope of the Certification Program.

VAV-PRC012-EN

91

Acoustics Data

Low Height Parallel Fan-Powered Terminal Units
Table 114. Discharge sound power (dB)1,2,4
Inlet
Fan Size
Size (in) Cfm l/s

08SQ

5

0.5” Inlet Pressure 1.0” Inlet Pressure 1.5” Inlet Pressure 2.0” Inlet Pressure 3.0” Inlet Pressure
Ps5
Ps3
Ps5
Ps5
Ps5
2

3

4

5

6

7

2

3

4

5

6

7

2

3

4

5

6

7

08SQ
09SQ

6

8

10SQ

8
x
14

8
x
14

4

5

6

7

2

3

4

5

6

7

71

55 48 44 39 32 29 58 51 49 45 38 38

58 52 50 47 44 46 60 54 52 49 47 50

200

94

58 51 47 42 36 31 61 54 51 47 40 39

62 56 53 50 46 47 63 57 55 52 49 51

250 118 62 54 49 45 40 33 63 57 53 48 42 40 65 59 56 51 45 44 65 60 56 53 48 48 66 61 58 54 51 52
69 62 59 55 50 48 69 64 61 57 54 54

350 165 67 59 54 50 46 41 69 62 57 53 49 44

71 65 61 57 51 49 73 68 64 61 58 55

200

56 49 45 40 34 29 58 52 50 44 38 37

61 55 52 50 47 48 63 57 54 51 49 52

280 132 60 53 49 44 40 33 62 56 54 48 44 40

65 59 56 53 50 48 67 61 58 55 52 52

350 165 63 57 53 48 44 37 65 60 57 52 48 42

68 62 59 56 53 49 70 64 61 58 55 53

94

400 189

69 64 60 56 54 47

430 203 67 62 57 52 50 42 68 64 60 56 54 46

71 66 63 59 56 50 73 68 65 61 58 54

500 236 71 65 61 56 53 45 71 67 63 59 57 49

73 69 66 62 60 53 75 71 68 64 62 56

350 165 58 51 48 44 39 31 61 55 53 48 44 40

65 60 57 53 50 49 67 62 60 55 53 52

500 236 61 55 52 48 44 36 65 59 56 52 48 43

69 64 61 57 54 51 71 66 64 59 57 54

600 283 64 58 54 50 47 39 67 61 59 54 51 45
700 330

71 67 64 60 57 53 73 69 66 62 59 56
72 67 64 60 57 51

800 378 68 63 59 56 52 44 71 66 63 59 56 49

09SQ

3

150

300 142 65 56 51 48 43 37 66 60 55 50 45 42

08SQ
09SQ

2

75 71 68 64 62 56 78 74 71 68 64 59

900 425 70 65 61 58 55 47 73 68 64 61 58 51

77 72 69 66 63 57 80 75 73 70 67 61

780 368 64 63 58 52 48 45 69 69 62 56 52 54

73 70 72 61 56 55 77 74 78 66 59 56

1100 519 66 64 61 54 52 48 70 69 66 59 56 55

76 72 75 64 61 58 79 76 80 68 63 59

1500 708 69 67 65 58 56 51 73 69 71 62 61 57

79 75 79 69 66 62 83 78 82 72 68 63

1560 736

75 73 74 66 63 60

1800 850 71 69 68 61 59 53 75 71 74 65 63 58

81 76 80 71 68 63 83 78 82 73 70 65

103
2200
8

78 73 76 68 65 61

82 77 81 73 70 65 84 79 83 75 72 67

780 368 65 60 52 48 41 34 68 66 60 57 45 42

70 68 66 65 51 50 72 69 69 69 56 54

1170 552

72 69 62 58 51 46

75 74 70 68 56 52 76 76 75 73 59 56

1560 736

76 74 70 65 59 53 78 76 72 68 60 55 79 79 76 74 63 59

1800 850

79 77 75 70 63 57 81 80 77 74 65 60

2000 944

80 78 78 71 65 59 82 80 78 74 67 61

Notes:
1. All data are measured in accordance with Industry Standard AHRI 880-2011.
2. All sound power levels, dB re: 10-12 Watts.
3. Data in this column constitute AHRI 880-2011 Standard Rating Conditions.
4. Where Ps is the inlet static pressure minus discharge static.
5. Application ratings are outside the scope of the certification program.

92

VAV-PRC012-EN

Acoustics Data

Table 115. Radiated sound power (dB)1,2,4
Inlet
Fan Size
Size (in) Cfm l/s

08SQ

5

0.5” Inlet Pressure 1.0” Inlet Pressure 1.5” Inlet Pressure 2.0” Inlet Pressure 3.0” Inlet Pressure
Ps5
Ps3
Ps5
Ps5
Ps5
2

3

4

5

6

7

2

3

4

5

6

7

2

3

4

5

6

7

08SQ
09SQ

6

8

10SQ

8
x
14

8
x
14

4

5

6

7

2

3

4

5

6

7

71

53 44 38 33 28 21 54 45 40 36 31 25

54 47 42 40 38 34 56 49 45 46 42 38

200

94

55 46 41 35 29 21 56 48 42 37 32 25

57 50 45 42 38 34 58 51 47 46 42 38

250 118 56 49 44 36 30 22 59 50 44 38 33 26 59 50 46 41 36 32 60 52 48 43 39 34 61 53 48 47 43 38
62 54 50 45 40 34 63 55 50 48 44 38

350 165 62 51 46 39 33 26 65 55 50 43 36 30

65 56 51 47 41 35 65 57 53 50 45 39

200

53 45 40 33 27 21 56 48 43 35 29 22

57 48 44 40 37 32 58 50 45 45 42 37

280 132 54 46 40 33 27 22 57 50 45 37 30 24

59 51 47 42 37 33 61 53 48 46 42 37

350 165 54 46 41 34 28 22 58 51 46 38 31 25

62 54 49 44 38 34 63 55 50 47 43 38

94

400 189

62 55 50 42 36 31

430 203 56 49 43 36 30 25 60 53 48 40 33 27

64 57 52 46 39 35 66 58 53 49 43 38

500 236 59 53 47 40 34 29 62 55 50 42 35 30

66 58 53 47 41 36 68 60 55 51 44 39

350 165 57 50 45 38 34 23 59 54 46 40 34 26

61 55 48 43 39 35 63 56 50 47 44 37

500 236 60 53 47 40 34 24 62 56 49 42 36 28

65 58 51 46 41 35 67 60 54 50 45 38

600 283 62 54 49 41 34 24 65 58 51 44 37 29
700 330

68 60 54 47 42 35 70 62 56 51 46 38
69 61 55 47 40 33

800 378 65 57 52 44 36 26 69 61 54 46 40 32

09SQ

3

150

300 142 59 50 45 38 31 24 62 52 47 40 34 28

08SQ
09SQ

2

73 64 58 50 44 36 74 66 60 54 48 40

900 425 66 58 53 45 37 28 71 63 56 48 41 33

75 66 60 52 45 37 76 67 62 55 48 40

780 368 62 59 55 48 40 31 66 61 57 51 44 38

70 63 61 53 48 43 72 66 63 55 51 46

1100 519 64 60 56 47 40 32 68 63 60 52 45 38

72 66 65 57 52 45 74 68 66 59 54 48

1500 708 68 62 58 47 39 32 71 65 64 53 46 39

75 69 70 62 56 47 77 72 70 63 58 50

1560 736

73 68 67 58 51 43

1800 850 71 63 59 47 39 32 73 67 68 54 47 39

77 71 72 62 56 47 79 73 73 64 59 50

103
2200
8

76 70 73 55 48 40

80 74 75 62 55 47 82 75 76 65 58 49

780 368 60 55 47 41 32 28 63 61 55 48 38 34

66 63 60 55 45 41 69 66 64 59 50 45

1170 552

68 65 57 50 41 39

71 69 66 59 48 45 74 74 69 64 53 48

1560 736

73 71 64 56 47 46 74 72 66 59 49 47 76 74 71 65 54 50

1800 850

75 74 68 61 51 49 77 76 72 65 55 51

2000 944

76 75 70 62 52 50 78 77 72 65 55 52

Notes:
1. All data are measured in accordance with Industry Standard AHRI 880-2011.
2. All sound power levels, dB re: 10-12 Watts.
3. Data in this column constitute AHRI 880-2011 Standard Rating Conditions.
4. Where Ps is the inlet static pressure minus discharge static.
5. Application ratings are outside the scope of the certification program.

VAV-PRC012-EN

93

Acoustics Data

Table 116. Fan only sound power (dB)
Discharge Lw (dB)
Fan

08SQ

09SQ

10SQ

08SQ
ECM

09SQ
ECM

Outlet
SP

0.25

0.25

0.25

0.25

0.25

Radiated Lw (dB)

Octave Bands

Octave Bands

CFM

l/s

2

3

4

5

6

7

2

3

4

5

6

7

175

83

61

53

51

47

41

34

65

56

57

50

41

35

250

118

64

56

55

50

44

40

68

58

60

53

44

38

320

151

67

58

58

53

48

45

72

61

63

56

48

42

400

189

71

62

61

58

54

51

75

64

65

61

52

47

460(a)

217

73

64

64

62

58

56

76

66

69

63

55

50

470

222

74

65

65

62

58

56

77

67

69

64

56

50

400

189

70

61

58

54

48

44

69

65

62

56

46

38

500

236

71

62

59

56

49

46

70

66

64

58

48

40

700

330

74

65

63

61

54

53

72

69

68

64

54

46

800

378

76

67

65

64

57

56

74

71

70

67

57

49

900(a)

425

78

70

69

67

61

61

77

74

72

69

60

53

700

330

67

59

56

51

45

40

67

61

57

54

49

44

840

396

69

60

58

53

48

43

68

63

58

55

50

46

980

463

70

63

59

56

51

47

70

65

60

57

53

50

1200

566

74

67

64

61

56

54

73

69

64

61

57

55

1400

661

77

71

67

65

60

57

76

72

67

64

60

58

1420(a)

670

77

71

67

65

60

57

76

72

67

64

60

58

150

71

61

55

51

46

40

34

66

58

56

50

42

36

230

109

64

57

54

49

44

39

69

60

58

52

44

40

310

146

67

59

57

53

48

45

71

62

62

56

47

44

380

179

70

61

61

57

51

50

74

64

64

59

50

47

460(a)

217

72

65

64

61

55

54

76

67

66

63

54

51

400

189

71

61

58

54

47

45

69

64

61

56

47

41

600

283

75

64

62

59

52

51

72

67

65

61

51

45

700

330

77

66

64

63

56

56

75

71

68

64

55

49

900(a)

425

81

71

70

68

62

62

79

75

72

69

61

55

1020

481

83

73

72

70

65

64

81

78

74

72

64

58

Notes:
1. All data are measured in accordance with Industry Standard AHRI 880-2011.
2. all sound power levels, dB re: 10-12 Watts
3. application ratings are outside the scope of the certification program
(a) AHRI 880-2011 section 7.2 Standard Rating Conditions

Table 117. AHRI 885-2008 add discharge transfer function assumptions:
Octave Band
2

3

4

5

6

7

Small Box (< 300 CFM)
Medium Box (300-700 CFM)

-24
-27

-28
-29

-39
-40

-53
-51

-59
-53

-40
-39

Large Box (> 700 CFM)

-29

-30

-41

-51

-52

-39

Notes: Subtract from terminal unit sound power to determine discharge sound pressure in the space.
1. NC Values are calculated using modeling assumptions based on AHRI 885-2008.
2. Where DPs is inlet static pressure minus discharge static pressure.
3. Application ratings are outside the scope of the Certification Program.

94

VAV-PRC012-EN

Acoustics Data

Table 118. AHRI 885-2008 radiated transfer function assumptions:
Octave Band
Type 2- Mineral Fiber Insulation
Total dB reduction

2

3

4

5

6

7

-18
-18

-19
-19

-20
-20

-26
-26

-31
-31

-36
-36

Notes: Subtract from terminal unit sound power to determine radiated sound pressure in the space.
1. NC Values are calculated using modeling assumptions based on AHRI 885-2008.
2. Where DPs is inlet static pressure minus discharge static pressure.
3. Application ratings are outside the scope of the Certification Program.

Table 119. Sound noise criteria (NC) - valve only

Fan
Size

08SQ

08SQ
09SQ

08SQ
09SQ

09SQ

10SQ

Inlet
Size
(in)

5

6

8

8x14

8x14

Discharge1,2,4
Inlet Pressure
1.5”

Radiated1,2,4

(Ps)3,5

Inlet Pressure (Ps)3,5

CFM

l/s

0.5”

1.0”

2.0”

3.0”

0.5”

1.0”

2.0”

3.0”

150

71

--

--

--

--

--

--

15

19

200

94

--

16

17

19

16

17

19

21

250

118

17

19

21

23

18

21

300

142

21

23

26

26

21

25

21

1.5”

21

22

24

25

26

350

165

24

26

29

32

25

29

29

29

200

94

--

--

--

16

--

17

19

20

280

132

--

--

17

20

--

19

21

24

350

165

--

18

21

24

--

20

25

26

400

189

430

203

20

22

27

30

23

25
25

28

17

22

500

236

25

26

28

31

21

25

30

33

350

165

--

--

18

20

19

23

24

26

500

236

--

17

23

25

22

25

29

31

600

283

16

20

26

28

25

29

33

35

700

330

800

378

21

25

31

34

29

34

39

40

900

425

24

28

33

37

30

36

42

43

780

368

20

27

28

33

30

32

36

38

1100

519

21

27

31

36

31

35

40

41

1500

708

25

27

34

38

33

39

46

46

1560

736

1800

850

44

48

49

2200

1038

49

51

52

780

368

31

35

39

1170

552

36

41

46

1560

736

44

47

1800
2000

26

34

32
27

43

30

36

38

32

37

39

24

26

27

27

33

36

36

39

850

37

40

46

49

944

38

40

47

50

17

33

36

24

43

Notes:
1. “--” represents NC levels below NC 15.
2. NC Values are calculated using modeling assumptions based on AHRI 885-98-02 Addendum
3. Data at 1.5” inlet pressure constitute AHRI 880-2011 Standard Rating Conditions.
4. Where Ps is the inlet static pressure minus discharge static.
5. Data at 0.5”, 1.0”, 2.0” and 3.0” are application ratings. These ratings are outside the scope of the certification program.

VAV-PRC012-EN

95

Acoustics Data

Table 120. Sound noise criteria (NC) - fan only
Fan-Only
0.25” Disch. Pres.
Fan

08SQ

09SQ

10SQ

08SQ
ECM

09SQ
ECM

Outlet SP

0.25

0.25

0.25

0.25

0.25

CFM

l/s

Discharge

Radiated

175

83

--

32

250

118

16

35

320

151

20

38

400

189

25

42

460(a)

217

28

45

470

222

29

45

400

189

21

37

500

236

23

39

700

330

26

44

800

378

29

46

900(a)

425

32

48

700

330

17

32

840

396

20

33

980

463

21

36

1200

566

26

40

1400

661

30

44

1420(a)

670

30

44

150

71

--

31

230

109

--

34

310

146

17

37

380

179

21

40

460(a)

217

24

43

400

189

23

36

600

283

28

40

700

330

30

44

900(a)

425

35

48

1020

481

38

51

Notes:
1. “--” represents NC levels below NC 15.
2. NC values are calculated using modeling assumptions based on AHRI 885-2008 Appendix E.
3. Application ratings are outside the scope of the certification program.
(a) AHRI 880-2011 section 7.2 Standard Rating Conditions.

Table 121. Discharge sound power (dB)-fan only (AHRI conditions)
Fan Size

Inlet Size

Cfm

L/s

2

3

4

5

6

7

08SQ

5, 6, 8

460

217

68

62

63

62

58

56

09SQ

6, 8, 8x14

900

425

73

68

68

67

61

61

10SQ

8, 8x14

1420

670

72

69

66

65

60

57

Notes:
1. All sound data rated in accordance with current Industry Standard AHRI 880-2011.
2. All sound power levels, dB re: 10-12 Watts.

96

VAV-PRC012-EN

Acoustics Data

Table 122. Radiated sound power (dB)-fan only (AHRI conditions)
Fan Size

Inlet Size

Cfm

L/s

2

3

4

5

6

7
50

08SQ

5, 6, 8

460

217

76

66

69

63

55

09SQ

6, 8, 8x14

900

425

77

74

72

69

60

53

10SQ

8, 8x14

1420

670

76

72

67

64

60

58

Notes:
1. All sound data rated in accordance with current Industry Standard AHRI 880-2011.
2. All sound power levels, dB re: 10-12 Watts.

Table 123. Inlet attenuator appurtenance effects (fan noise only)
Discharge Sound Effect(a)(dB)
Fan
Matte-faced and foil-faced
08SQ, 09SQ

2

Radiated Sound Effect(a) (dB)

3

4

5

6

7

2

3

4

5

6

7

2

3

4

5

5

6

2

0

-4

-8

-7

-7

2

3

4

5

4

5

2

1

2

-3

-4

-4

insulation(b)

Closed-cell insulation
08SQ, 09SQ

(a) Add to sound power, a negative effect represents a sound reduction, a positive effect represents a sound increase.
(b) Attenuators on double-wall units contain foil-faced insulation.
All data are measured in accordance with Industry Standard AHRI 880-2011.
All sound power levels, dB re: 10-12 Watts.
Application ratings are outside the scope of the Certification Program.

Table 124. Cabinet lining appurtenance effects (fan noise and valve noise)
Discharge Sound Effect(a) (dB)
Fan

Radiated Sound Effect(a) (dB)

2

3

4

5

6

7

2

3

4

5

6

7

1

0

2

3

4

6

2

1

2

5

9

13

2

1

3

2

2

2

2

2

4

5

5

8

Solid double-wall
08SQ, 09SQ

Closed-cell insulation
08SQ, 09SQ

(a) Add to sound power, a negative effect represents a sound reduction, a positive effect represents a sound increase.
All data are measured in accordance with Industry Standard AHRI 880-2011.
All sound power levels, dB re: 10-12 Watts.
Application ratings are outside the scope of the Certification Program.

Table 125. Heating coil appurtenance effects
Discharge Sound Effect(a) (dB)
Fan

Radiated Sound Effect(a) (dB)

2

3

4

5

6

7

2

3

4

5

6

7

3

3

4

5

4

5

2

2

3

3

3

4

0

-1

0

1

1

3

1

1

1

2

2

3

Hot Water Coil (Fan Noise)
08SQ, 09SQ

Electric Heat
08SQ, 09SQ

(a) Add to sound power, a negative effect represents a sound reduction, a positive effect represents a sound increase.
All data are measured in accordance with Industry Standard AHRI 880-2011.
All sound power levels, dB re: 10-12 Watts.
Application ratings are outside the scope of the Certification Program.

VAV-PRC012-EN

97

Acoustics Data

Low Height Series Fan-Powered Terminal Units
Table 126. Discharge sound power (dB)
Inlet
Fan Size
Size (in)

08SQ

8

09SQ 8x14

10SQ 8x14

08SQ
ECM

8

09SQ
8x14
ECM

10SQ
8x14
ECM

0.5” Inlet Pressure Ps 1.0” Inlet Pressure Ps 2.0” Inlet Pressure Ps 3.0” Inlet Pressure Ps
Cfm

l/s

2

3

4

5

6

7

2

3

4

5

6

7

2

3

4

5

6

7

2

3

4

5

6

7

170

80

61

53

54

47

44

42

60

52

49

42

38

33

61

58

50

43

39

34

61

60

52

45

41

35

250

118

64

56

57

52

49

47

63

55

54

48

44

40

64

60

55

49

45

41

64

62

55

50

46

42

330

156

68

60

61

56

53

52

67

59

58

53

49

47

68

63

59

54

50

48

68

65

59

55

51

49

410

193

71

63

64

61

57

57

71

63

63

59

55

55

72

65

63

60

56

55

72

67

63

60

56

56

500

227

74

67

67

65

61

62

75

67

67

65

61

62

76

68

67

65

61

62

76

69

67

65

61

63

350

165

63

59

55

51

45

41

64

60

59

52

45

41

65

62

59

53

47

42

66

63

59

54

48

44

500

236

67

64

60

57

51

49

67

65

63

57

51

49

69

67

63

58

53

49

71

68

63

59

54

51

700

330

71

70

66

64

59

59

72

71

67

64

59

59

75

73

67

65

60

59

77

75

69

66

61

61

800

378

75

73

68

67

62

62

75

73

69

67

62

62

76

74

69

67

63

62

78

76

71

68

64

64

890

420

77

75

70

69

65

64

77

75

71

69

65

64

78

76

71

69

65

64

79

77

72

70

66

66

440

208

60

58

54

50

43

37

62

59

54

51

44

39

64

60

57

51

46

40

66

63

58

53

47

41

700

330

63

60

57

53

47

43

64

61

57

54

48

44

66

63

59

55

49

45

69

64

65

56

51

46

65

64

60

56

50

47

900

425

1100

519

67

65

61

58

53

50

69

66

62

59

53

51

71

67

66

60

55

51

69

68

64

62

57

55

71

69

65

62

57

56

72

70

66

63

58

56

1300

614

73

72

68

65

61

60

74

72

68

66

61

60

1500

708

170

80

61

53

54

47

44

42

60

52

49

42

38

33

75

74

70

68

64

63

76

74

70

69

64

63

61

58

50

43

39

34

61

60

52

45

41

250

118

64

56

57

52

49

47

63

55

54

48

44

35

40

64

60

55

49

45

41

64

62

55

50

46

330

156

68

60

61

56

53

52

67

59

58

53

42

49

47

68

63

59

54

50

48

68

65

59

55

51

49

410

193

71

63

64

61

57

57

71

63

63

500

227

74

67

67

65

61

62

75

67

67

59

55

55

72

65

63

60

56

55

72

67

63

60

56

56

65

61

62

76

68

67

65

61

62

76

69

67

65

61

350

165

63

59

55

51

45

41

64

60

63

59

52

45

41

65

62

59

53

47

42

66

63

59

54

48

500

236

67

64

60

57

51

49

67

44

65

63

57

51

49

69

67

63

58

53

49

71

68

63

59

54

51

700

330

71

70

66

64

59

59

800

378

75

73

68

67

62

62

72

71

67

64

59

59

75

73

67

65

60

59

77

75

69

66

61

61

75

73

69

67

62

62

76

74

69

67

63

62

78

76

71

68

64

890

420

77

75

70

69

65

64

64

77

75

71

69

65

64

78

76

71

69

65

64

79

77

72

70

66

440

208

60

58

54

50

66

43

37

62

59

54

51

44

39

64

60

57

51

46

40

66

63

58

53

47

41

700

330

63

60

57

900

425

65

64

60

53

47

43

64

61

57

54

48

44

66

63

59

55

49

45

69

64

65

56

51

46

56

50

47

67

65

61

58

53

50

69

66

62

59

53

51

71

67

66

60

55

1100

519

51

69

68

64

62

57

55

71

69

65

62

57

56

72

70

66

63

58

56

1300

614

73

72

68

65

61

60

74

72

68

66

61

60

1500

708

75

74

70

68

64

63

76

74

70

69

64

63

Notes:
1. All data are measured in accordance with Industry Standard AHRI 880-2011.
2. All sound power levels, dB re: 10-12 Watts.
3. Where Ps is the inlet static pressure minus discharge static.
4. Application ratings are outside the scope of the certification program.

98

VAV-PRC012-EN

Acoustics Data

Table 127. Radiated sound power (dB)1,2,4
Inlet
Fan Size
Size (in) Cfm
170
08SQ

09SQ

10SQ

8

8
x
14

8
x
14

0.5” Inlet Pressure 1.0” Inlet Pressure 1.5” Inlet Pressure 2.0” Inlet Pressure 3.0” Inlet Pressure
Ps5
Ps5
Ps5
Ps5
Ps5
l/s

2

80

3

4

5

6

7

2

3

4

5

6

7

2

3

4

5

6

7

2

3

4

5

6

7

2

3

4

5

6

7

54 49 45 37 28 22 55 53 47 40 33 31

58 62 55 45 41 37 58 63 58 49 46 40

250

118 57 52 48 42 33 27 58 56 50 43 36 33

60 63 56 47 42 38 60 64 59 50 46 41

330

156 60 56 52 46 37 31 61 59 54 47 39 36

63 64 58 50 43 39 63 65 60 52 46 42

410

193 63 60 56 50 41 36 64 62 57 50 42 38

65 65 59 52 44 41 65 67 62 53 46 43

500

227 66 64 60 53 44 40 67 65 60 54 45 41 68 66 61 54 46 42 68 66 61 54 45 42 68 68 63 55 46 44

350

165 58 53 47 39 32 27 59 56 56 43 37 34

62 63 61 52 45 42 64 65 62 54 49 45

500

236 62 57 51 44 36 30 63 59 57 46 39 36

65 64 62 53 46 44 67 66 63 55 50 47

700

330 68 63 56 50 40 33 68 64 58 50 42 39

69 65 62 53 47 46 71 67 64 56 51 50

800

378 70 66 58 52 44 38 70 66 59 52 44 41 70 66 61 53 46 44 71 67 63 55 48 47 72 69 65 57 52 51

890

420 72 67 59 54 46 40 72 67 60 54 46 42

73 69 64 56 49 48 74 71 67 59 53 51

440

208 61 56 49 42 33 27 62 59 52 45 40 38

65 60 60 50 46 46 66 63 61 58 50 49

700

330 62 58 51 45 37 31 64 61 55 48 43 41

68 64 62 53 48 48 70 66 67 57 52 51

900

425 66 62 55 48 41 34 68 63 56 50 44 42

1100 519

70 66 64 55 50 50 72 68 68 58 54 52

71 65 58 53 46 42

72 68 65 57 52 52 73 70 69 60 55 54

1300 614

74 69 65 58 53 52 76 72 69 61 56 55
76 70 63 59 52 48

1500 708
170
08SQ
ECM

09SQ
ECM

10SQ
ECM

8

8
x
14

8
x
14

80

76 71 64 60 54 52 78 74 70 63 58 57
54 49 44 36 29 22 57 54 48 39 36 30

57 60 54 44 41 36 58 61 56 48 45 40

250

118 57 52 47 40 32 27 59 56 50 42 37 32

59 62 56 46 42 38 60 63 58 50 46 41

330

156 60 56 51 44 36 31 62 58 53 46 39 35

62 64 58 49 44 40 63 66 61 52 47 42

410

193 63 59 55 48 40 36 64 60 56 49 41 38

65 66 60 52 45 42 66 68 63 54 48 44

500

227 66 62 58 52 43 40 66 62 58 52 43 40

67 67 61 54 46 43 68 70 65 56 49 45

350

165 60 53 47 40 32 25 60 56 55 43 37 34

63 63 62 52 45 42 64 63 62 54 49 47

500

236 64 57 51 44 36 29 64 59 56 46 39 36

67 64 63 53 46 44 68 65 63 55 50 48

700

330 71 63 56 51 41 33 71 64 58 51 42 39

71 65 63 53 47 46 73 68 64 57 51 49

800

378 73 66 58 53 44 38 73 66 59 53 44 40

73 67 63 55 48 46 75 69 64 58 52 49

890

420 75 67 59 55 46 40 75 67 60 55 46 41

75 69 63 56 49 47 77 70 65 59 53 50

440

208 61 54 47 42 37 32 62 57 49 44 38 38

64 59 60 48 44 44 68 63 68 56 48 51

700

330 64 57 50 45 37 32 66 60 54 49 43 43

69 64 60 53 47 49 71 66 68 56 51 51

900

425 65 62 55 48 40 35 69 63 56 52 44 43

1100 519

72 66 58 54 46 43

72 67 61 55 50 51 73 68 68 58 52 52
74 70 62 57 52 53 75 71 67 60 54 54

1300 614

76 71 63 59 53 53 77 72 67 61 56 55

1500 708

78 72 65 61 54 52 79 74 68 63 58 57

Notes:
1. All data are measured in accordance with Industry Standard AHRI 880-2011.
2. All sound power levels, dB re: 10-12 Watts.
3. Data in this column constitute AHRI 880-2011 Standard Rating Conditions.
4. Where Ps is the inlet static pressure minus discharge static.
5. Application ratings are outside the scope of the certification program.

VAV-PRC012-EN

99

Acoustics Data

Table 128. Fan only sound power (dB)
Discharge Lw (dB)
Fan

08SQ

09SQ

10SQ

08SQ
ECM

09SQ
ECM

10SQ
ECM

Outlet
SP

0.25

0.25

0.25

0.25

0.25

0.25

Radiated Lw (dB)

Octave Bands

Octave Bands

CFM

l/s

2

3

4

5

6

7

2

3

4

5

6

7

170

80

61

51

52

46

42

38

53

47

44

36

26

21

250

118

63

54

55

50

46

43

56

51

48

41

30

23

330

156

67

58

59

54

50

49

59

56

52

46

36

27

410

193

70

61

64

58

56

56

60

59

55

49

40

34

480

227

73

64

66

62

60

59

63

62

58

53

44

37

500(a)

236

73

65

67

63

60

60

64

62

59

54

45

38

350

165

65

58

55

51

46

41

57

51

44

38

24

20

500

236

69

62

60

57

52

49

61

55

48

42

30

23

700

330

74

68

66

64

59

58

66

61

55

49

38

29

800(a)

378

77

70

69

67

62

61

68

64

58

52

42

32

890

420

79

73

71

70

65

64

70

67

60

55

45

36

440

208

61

58

54

51

44

38

62

57

48

41

29

22

700

330

63

61

58

56

49

45

64

60

51

45

33

24

900

425

65

64

61

59

53

51

66

62

54

48

36

26

1100

519

68

67

64

62

57

55

68

64

57

52

40

30

1300

614

71

70

66

66

61

59

71

66

60

55

44

33

1400(a)

661

72

71

68

68

62

61

72

68

61

56

46

35

1500

708

73

73

69

69

64

63

74

69

62

58

48

36

170

80

60

48

47

42

36

30

53

46

41

36

25

23

250

118

63

52

53

48

44

38

55

50

45

40

28

25

330

156

67

57

59

53

50

47

58

54

50

44

33

28

410

193

71

62

63

59

56

54

61

58

54

49

38

33

480

227

74

65

67

64

61

59

66

61

57

53

43

37

350

165

64

60

57

53

48

46

60

53

45

39

28

23

500

236

69

65

62

60

55

54

64

58

50

44

34

28

700

330

73

71

67

67

62

61

69

63

56

51

40

33

800

378

77

74

71

70

66

65

72

66

59

54

44

36

890

420

80

78

74

74

70

69

76

70

62

57

48

40

440

208

62

59

58

55

49

48

62

55

48

41

30

23

700

330

65

62

61

58

52

51

65

59

52

46

35

27

900

425

67

64

63

61

55

54

67

62

55

50

39

30

1100

519

69

67

66

64

58

58

70

66

58

54

42

33

1300

614

72

70

68

67

62

62

73

69

61

57

46

36

1500

708

75

73

70

70

65

65

75

71

63

59

49

40

Notes:
1. All data are measured in accordance with Industry Standard AHRI 880-2011.
2. All sound power levels, dB re: 10-12 Watts
3. Application ratings are outside the scope of the certification program
(a) AHRI 880-2011 section 7.2 Standard Rating Conditions

100

VAV-PRC012-EN

Acoustics Data

Table 129. Sound noise criteria (NC) - fan and 100% primary
Fan
Size

08SQ

09SQ

10SQ

08SQ
ECM

09SQ
ECM

10SQ
ECM

Inlet
Size
(in)

8

8x14

8x14

8

8x14

8x14

Discharge

Radiated

Inlet Pressure (Ps)

Inlet Pressure (Ps)

CFM

l/s

0.5”

1.0”

2.0”

3.0”

0.5”

1.0”

2.0”

3.0”

170

80

--

--

15.6

18.0

18.7

21.4

32.0

33.2

250

118

17

15

18

20

22

25

33

34

330

156

22

20

22

24

26

28

34

36

410

193

26

26

27

27

31

32

36

38

480

227

29

31

32

32

35

36

37

39

350

165

16

17

19

20

21

31

36

37

500

236

22

23

25

26

26

32

37

38

700

330

29

30

32

35

33

34

37

39

800

378

32

32

33

36

37

37

38

40

890

420

35

35

36

37

38

38

40

43

440

208

--

16

17

20

25

28

35

36

700

330

17

18

20

22

27

31

37

43

900

425

22

23

24

25

32

33

39

44

1100

519

26

27

29

36

40

45

1300

614

31

31

40

45

1500

708

33

33

43

46

170

80

--

--

16

18

18

23

30

31

250

118

17

15

18

20

21

25

32

33

330

156

22

20

22

24

25

27

34

37

410

193

26

26

27

27

30

31

37

39

480

227

29

31

32

32

33

33

38

42

350

165

16

17

19

20

22

30

37

37

500

236

22

23

25

26

27

31

38

38

700

330

29

30

32

35

36

36

38

39

800

378

32

32

33

36

39

39

39

42

890

420

35

35

36

37

42

42

42

44

440

208

--

16

17

20

24

26

35

44

700

330

17

18

20

22

27

30

35

44

900

425

22

23

24

25

32

34

38

44

1100

519

26

27

29

38

42

43

1300

614

31

31

43

44

1500

708

33

33

45

47

Notes:
1. “--” represents NC levels below NC 15.
2. NC Values are calculated using modeling assumptions based on AHRI 885-98-02 Addendum
3. Where Ps is the inlet static pressure minus discharge static.
4. Data at 0.5”, 1.0”, 2.0” and 3.0” are application ratings. These ratings are outside the scope of the certification program.

Table 130.AHRI 885-2008 add discharge transfer function assumptions:
Octave Band
Small Box (< 300 CFM)
Medium Box (300-700 CFM)
Large Box (> 700 CFM)

2

3

4

5

6

7

-24
-27
-29

-28
-29
-30

-39
-40
-41

-53
-51
-51

-59
-53
-52

-40
-39
-39

Notes: Subtract from terminal unit sound power to determine discharge sound pressure in the space.
1. NC Values are calculated using current Industry Standard AHRI 885-2008. Radiated Transfer Function obtained from Appendix E, Type 2Mineral Fiber
Insulation.
2. Application ratings are outside the scope of the Certification Program.

VAV-PRC012-EN

101

Acoustics Data

Table 131. AHRI 885-2008 radiated transfer function assumptions:
Octave Band
Type 2- Mineral Fiber Insulation
Total dB reduction

2

3

4

5

6

7

-18
-18

-19
-19

-20
-20

-26
-26

-31
-31

-36
-36

Notes: Subtract from terminal unit sound power to determine radiated sound pressure in the space.
1. NC Values are calculated using current Industry Standard AHRI 885-2008. Radiated Transfer Function obtained from Appendix E, Type 2Mineral Fiber
Insulation.
2. Application ratings are outside the scope of the Certification Program.

Table 132. Inlet attenuator appurtenance effects
Discharge Sound Effect(a) (dB)
Fan

2

3

4

Radiated Sound Effect(a) (dB)

5

6

7

2

3

4

5

6

7

Matte-faced and foil-faced insulation, solid double-wall(b)
08SQ, 09SQ
10SQ

0
2

0
2

0
2

1
2

0
2

0
2

-1
-2

-3
-3

-3
-5

-7
-10

-7
-12

-6
-12

0
2

1
2

0
2

0
2

0
2

0
2

-1
-1

-1
-1

-1
-2

-4
-5

-6
-9

-4
-9

Closed-cell insulation
08SQ, 09SQ
10SQ

(a) Add to sound power, a negative effect represents a sound reduction, a positive effect represents a sound increase.
(b) Attenuators on double-wall units have 1" foil-faced insulation. All edges are encapsulated with metal.
All data are measured in accordance with Industry Standard AHRI 880-2011.
All sound power levels, dB re: 10-12 Watts.
Application ratings are outside the scope of the Certification Program.

Table 133. Cabinet lining appurtenance effects
Discharge Sound Effect(a) (dB)

Radiated Sound Effect(a) (dB)

Fan

2

3

4

5

6

7

2

3

4

5

6

7

08SQ, 09SQ
10SQ

0
0

0
0

0
0

0
0

0
0

0
0

-1
1

-2
0

2
2

11
9

17
14

19
16

0
0

0
0

0
0

0
0

0
0

0
0

2
2

3
3

6
4

7
7

8
6

12
11

Solid double-wall

Closed-cell insulation
08SQ, 09SQ
10SQ

(a) Add to sound power, a negative effect represents a sound reduction, a positive effect represents a sound increase.
All data are measured in accordance with Industry Standard AHRI 880-2011.
All sound power levels, dB re: 10-12 Watts.
Application ratings are outside the scope of the Certification Program.

Table 134. Heating coil appurtenance effects
Discharge Sound Effect(a) (dB)
Fan

Radiated Sound Effect(a) (dB)

2

3

4

5

6

7

2

3

4

5

6

7

1
1

1
2

1
2

1
1

2
2

1
1

1
1

2
1

2
1

3
2

7
4

12
8

-1
1

-2
0

-1
-1

-1
-1

-1
-1

-1
0

-3
2

-1
4

1
3

1
4

7
6

7
9

Hot Water Coil(b)
08SQ, 09SQ
10SQ

Electric Heat(b)
08SQ, 09SQ
10SQ

(a) Add to sound power, a negative effect represents a sound reduction, a positive effect represents a sound increase.
(b) Radiated effect applies to “fan only” sound only. Do not apply to fan + valve sound.
All data are measured in accordance with Industry Standard AHRI 880-2011.
All sound power levels, dB re: 10-12 Watts.
Application ratings are outside the scope of the Certification Program.

102

VAV-PRC012-EN

Dimensional Data
Parallel Fan-Powered Terminal Units
PARALLEL COOLING ONLY (VPCF)
FAN
SIZE
02SQ
03SQ
04SQ
05SQ
06SQ
07SQ

INLET SIZE
AVAILABILITY
(NOMINAL Ø")
5", 6", 8", 10"
6", 8", 10", 12"
8", 10", 12", 14"
10", 12", 14"
10", 12", 14", 16"
10", 12", 14", 16"

INLET SIZE
AVAILABILITY
(NOMINAL Ømm)
127 mm, 152 mm, 203 mm, 254 mm
152 mm, 203 mm, 254 mm, 305 mm
203 mm, 254 mm, 305 mm, 356 mm
254 mm, 305 mm, 356 mm
254 mm, 305 mm, 356 mm, 406 mm
254 mm, 305 mm, 356 mm, 406 mm

H

W

UNIT WT
WT LBS
(kg)
78 (35)
96 (43)
97 (44)
111 (50)
20.00" (508 mm) 117 (53)
125 (57)

DISCHARGE DIMENSIONS

L

15.50" (394 mm) 40.00" (1016 mm)
17.50" (445 mm)

30.00" (762 mm)
32.50" (826 mm)

21.50" (546 mm)

40.00" (1016 mm)

A
19.25" (489 mm)

B
14.00" (356 mm)
16.00" (406 mm)

4.

Optional Attenuator
Field Installed

9.

9.

2.

Actuator, Controller and
Fan Controls located in this area

Actuator, Controller and
Fan Controls located in this area

40.00"
(1016 mm)

Airflow
Plenum Inlet

(Valves 5"-14")

4.00"
(102 mm)

(Valve 16")

20.00"
(508 mm)

2.00"
(51 mm)

Flow Ring
tubing

30.00"
(762 mm)

Valve 5"
6.50"
(165 mm)

Primary
Airflow

Optional Attenuator
Field Installed

Fan Size
4.00"
(102 mm)

Air
Valve

5.

18.875" Max.
(479 mm)

L

Filter Size

Attn. Weight
Wt Lbs
(kg)

02SQ

14" x 20" x 1"
(356 mm x 508 mm x 25 mm)

46 (21)

03SQ
04SQ
05SQ

16" x 20" x 1"
(406 mm x 508 mm x 25 mm)

48 (22)

06SQ
07SQ

20" x 20" x 1"
(508 mm x 508 mm x 25 mm)

54 (25)

9.

NOTES:
1. Allow a minimum 6" (152 mm) plenum inlet
clearance for unducted installations.

TOP VIEW

2. Filter location with optional Attenuator.

5.

5.50" Max.
(140 mm)

3. Attenuator-factory assembled, field installed.

Panel slides
for Motor access

Airflow
Discharge Outlet

4. See Installation Documents for exact hanger bracket location.

W

5. For Motor access, remove bottom screw on hanger brackets
to slide panel as shown in drawing.

20.00"
(508 mm)

6. When Attenuator option selected, water coil ships mounted
to attenuator.
7. Air valve centered between top and bottom panel.

11.30" Max.
B
(287 mm)

H
back draft damper

9.
A
DISCHARGE VIEW

VAV-PRC012-EN

8. All high & low voltage controls have same-side NEC
jumpback clearance. (Left-hand shown, right-hand/mirror
image optional.)
9. Maximum dimensions for controls area shown. Configurations
and types of control boxes vary according to control type
selected. See "Enclosure Details" for specific layout.
10. Graphic shown is for left-hand electrical. Right-hand electrical
is a mirror image.

103

Dimensional Data

PARALLEL HOT WATER (VPWF)
FAN
SIZE
02SQ
03SQ
04SQ
05SQ
06SQ
07SQ

INLET SIZE
AVAILABILITY
(NOMINAL Ø")
5", 6", 8", 10"
6", 8", 10", 12"
8", 10", 12", 14"
10", 12", 14"
10", 12", 14", 16"
10", 12", 14", 16"

INLET SIZE
AVAILABILITY
(NOMINAL Ømm)
127 mm, 152 mm, 203 mm, 254 mm
152 mm, 203 mm, 254 mm, 305 mm
203 mm, 254 mm, 305 mm, 356 mm
254 mm, 305 mm, 356 mm
254 mm, 305 mm, 356 mm, 406 mm
254 mm, 305 mm, 356 mm, 406 mm

H

W

UNIT WT
WT LBS
(kg)
78 (35)
96 (43)
97 (44)
111 (50)
20.00" (508 mm) 117 (53)
125 (57)

DISCHARGE DIMENSIONS

L

A
19.25" (489 mm)

15.50" (394 mm) 40.00" (1016 mm)
17.50" (445 mm)

30.00" (762 mm)
32.50" (826 mm)

21.50" (546 mm)

40.00" (1016 mm)

B
14.00" (356 mm)
16.00" (406 mm)

4.

Optional Attenuator
Field Installed

9.

9.
2.

Actuator, Controller and
Fan Controls located in this area

Actuator, Controller and
Fan Controls located in this area

40.00"
(1016 mm)

20.00"
(508 mm)

Water
Coil

Coil
Connection

6.30"
(160 mm)

Airflow
Plenum Inlet

4.00"
(102 mm)

(Valves 6"-14")

20.00"
(508 mm)

2.00"
(51 mm)

(Valve 16")

Flow Ring
tubing

Primary
Airflow

Air
Valve

30.00"
(762 mm)

Valve 5"
6.50"
(165 mm)

Optional Attenuator
Field Installed

4.00"
(102 mm)

5.
18.875" Max.

Fan Size

Filter Size

Attn. Weight
Wt Lbs
(kg)

02SQ

14" x 20" x 1"
(356 mm x 508 mm x 25 mm)

46 (21)

03SQ
04SQ
05SQ

16" x 20" x 1"
(406 mm x 508 mm x 25 mm)

48 (22)

06SQ
07SQ

20" x 20" x 1"
(508 mm x 508 mm x 25 mm)

54 (25)

(479 mm)

L

NOTES:

9.

1. Allow a minimum 6" (152 mm) plenum inlet clearance
for unducted installations.

TOP VIEW

2. Filter location with optional Attenuator.
3. Attenuator-factory assembled, field installed.

5.
Panel slides
for Motor access

Airflow
Discharge Outlet

4. See Installation Documents for exact hanger bracket location.
5. For Motor access, remove bottom screw on hanger
brackets to slide panel as shown in drawing.

5.50" Max.
(140 mm)

W

6. When Attenuator option selected, water coil ships
mounted to attenuator.

20.00"
(508 mm)

7. Air valve centered between top and bottom panel.

B

11.30" Max.
(287 mm)

H

8. All high & low voltage controls have same-side NEC
jumpback clearance. (Left-hand shown, right-hand/mirror
image optional.)
9. Maximum dimensions for controls area shown.

back draft damper

9.
A
DISCHARGE VIEW

104

VAV-PRC012-EN

Dimensional Data

PARALLEL WITH HOT WATER ON DISCHARGE (VPWF)
FAN
SIZE
02SQ
03SQ
04SQ
05SQ
06SQ
07SQ

INLET SIZE
AVAILABILITY
(NOMINAL Ø")
5", 6", 8", 10"
6", 8", 10", 12"
8", 10", 12", 14"
10", 12", 14"
10", 12", 14", 16"
10", 12", 14", 16"

INLET SIZE
AVAILABILITY
(NOMINAL Ømm)
127 mm, 152 mm, 203 mm, 254 mm
152 mm, 203 mm, 254 mm, 305 mm
203 mm, 254 mm, 305 mm, 356 mm
254 mm, 305 mm, 356 mm
254 mm, 305 mm, 356 mm, 406 mm
254 mm, 305 mm, 356 mm, 406 mm

H

W

UNIT WT
WT LBS
(kg)
78 (35)
96 (43)
97 (44)
111 (50)
117
(53)
20.00" (508 mm)
125 (57)

DISCHARGE DIMENSIONS

L

15.50" (394 mm) 40.00" (1016 mm)
17.50" (445 mm)

30.00" (762 mm)
32.50" (826 mm)

21.50" (546 mm)

40.00" (1016 mm)

A
20.00" (508 mm)

B
14.00" (356 mm)
16.00" (406 mm)

4.

Optional Attenuator
Field Installed

8.
8.

Actuator, Controller and
Fan Controls located in this area

2.

Actuator, Controller and
Fan Controls located in this area

40.00"
(1016 mm)

Airflow
Plenum Inlet

4.00"
(102 mm)

(Valves 5"-14")

20.00"
(508 mm)

2.00"
(51 mm)

(Valve 16")

Flow Ring
tubing

Primary
Airflow

Air
Valve

30.00"
(762 mm)

Valve 5"
6.50"
(165 mm)

Optional Attenuator
Field Installed

4.00"
(102 mm)

5.

Fan Size

Filter Size

Attn. Weight
Wt. Lbs.
(kg)

02SQ

14" x 20" x 1"
(356 mm x 508 mm x 25 mm)

46 (21)

03SQ
04SQ
05SQ

16" x 20" x 1"
(406 mm x 508 mm x 25 mm)

48 (22)

06SQ
07SQ

20" x 20" x 1"
(508 mm x 508 mm x 25 mm)

54 (25)

18.875" Max.
(479 mm)

L

8.

Airflow
Discharge Outlet
6.30"
(160 mm)

Water
Coil

TOP VIEW

NOTES:

5.

1. Allow a minimum 6" (152 mm) plenum inlet
clearance for unducted installations.

Panel slides
for Motor access

2. Filter location with optional Attenuator.
3. Attenuator-factory assembled, field installed.

20.00"
(508 mm)
5.50" Max.
(140 mm)

4. See Installation Documents for exact hanger bracket location.
W

20.00"
(508 mm)

5. For Motor access, remove bottom screw on hanger brackets
to slide panel as shown in drawing.
6. Air valve centered between top and bottom panel.

B

11.30" Max.
(287 mm)

H

7. All high & low voltage controls have same-side NEC
jumpback clearance. (Left-hand shown, right-hand/mirror
image optional.)
8. Maximum dimensions for controls area shown.

8.
A

VAV-PRC012-EN

DISCHARGE VIEW

105

Dimensional Data

106

VAV-PRC012-EN

Dimensional Data

VAV-PRC012-EN

107

Dimensional Data

PARALLEL ELECTRIC HEAT (VPEF)
FAN
SIZE
02SQ
03SQ
04SQ
05SQ
06SQ
07SQ

INLET SIZE
AVAILABILITY
(NOMINAL Ø")
5", 6", 8", 10"
6", 8", 10", 12"
8", 10", 12", 14"
10", 12", 14"
10", 12", 14", 16"
10", 12", 14", 16"

INLET SIZE
AVAILABILITY
(NOMINAL Ømm)
127 mm, 152 mm, 203 mm, 254 mm
152 mm, 203 mm, 254 mm, 305 mm
203 mm, 254 mm, 305 mm, 356 mm
254 mm, 305 mm, 356 mm
254 mm, 305 mm, 356 mm, 406 mm
254 mm, 305 mm, 356 mm, 406 mm

H

W

UNIT WT
WT LBS
(kg)
120 (54)
96 (43)
138 (63)
141 (64)
20.00" (508 mm) 178 (80)
186 (84)

DISCHARGE DIMENSIONS

L

A

15.50" (394 mm) 40.00" (1016 mm)
17.50" (445 mm)

30.00" (762 mm)
32.50" (826 mm)

21.50" (546 mm)

40.00" (1016 mm)

20.00" (508 mm)

B
14.00" (356 mm)
16.00" (406 mm)

5.

Optional Attenuator
Field Installed

9.
2.

9.

Actuator, Controller and
Fan Controls located in this area

Actuator, Controller and
Fan Controls located in this area

40.00"
(1016 mm)

Airflow
Plenum Inlet
20.00"
(508 mm)
4.00"
(102 mm)

Valve 5"
6.50"
(165 mm)

Primary
Airflow

Flow Ring
tubing

Air
Valve

30.00"
(762 mm)

Optional Attenuator
Field Installed

4.

18.875" Max.
(479 mm)

9.

Terminal Box

L

22.00"
(559 mm)

Fan Size

Filter Size

Attn. Weight
Wt. Lbs.
(kg)

02SQ

14" x 20" x 1"
(356 mm x 508 mm x 25 mm)

46 (21)

03SQ
04SQ
05SQ

16" x 20" x 1"
(406 mm x 508 mm x 25 mm)

48 (22)

06SQ
07SQ

20" x 20" x 1"
(508 mm x 508 mm x 25 mm)

54 (25)

4.00"
(102 mm)

NOTES:
1. Allow a minimum 6" (152 mm) plenum inlet clearance for
unducted installations.

6.00"
(152 mm)

Heater

4.

2. Filter location with optional Attenuator.

Panel slides
for Motor access
Airflow
Discharge Outlet

5.50" Max.
(140 mm)

3. Attenuatory factory assembled, field installed.
4. For motor access, remove bottom screws on hanger brackets
to slide panel as shown in drawing.

TOP VIEW

W

5. See Installation Documents for exact hanger bracket location.

20.00"
(508 mm)

6. Air valve centered between top and bottom panel.
7. Heating coil uninsulated. External insulation may be field
supplied and installed as required.
8. All high & low voltage controls have same side NEC jumpback
clearance. (Left-hand shown, right-hand/mirror image optional.)

B

11.30" Max.
(287 mm)

H

9. Maximum
Maximum dimensions
dimensions for
forcontrols
controlsarea
area shown.
shown.Configurations
and types of control boxes vary according to control type
selected. See "Enclosure Details" for specific layout.

9.
A
DISCHARGE VIEW

108

VAV-PRC012-EN

Dimensional Data

Series Fan-Powered Terminal Units
SERIES COOLING ONLY (VSCF) WITHOUT ATTENUATOR
INLET SIZE
INLET SIZE
DISCHARGE DIMENSIONS
FAN AVAILABILITY
AVAILABILITY
L
H
W
C
D
SIZE NOMINAL Ø
NOMINAL Ø
B
A
INCHES
(mm)
02SQ 4, 5, 6, 8, 10 104, 127, 152, 203, 254 15.50" (394 mm) 22.00" (559 mm) 34.00" (864 mm) 12.00" (305 mm) 14.00" (356 mm) 5.00" (127 mm) .65" (17 mm)
03SQ
152, 203, 254, 305
6, 8, 10, 12
17.50" (445 mm) 24.00" (610 mm) 40.00" (1016 mm) 19.00" (483 mm) 16.00" (406 mm) 2.50" (64 mm) .75" (19 mm)
04SQ 6, 8, 10, 12, 14 152, 203, 254, 305, 356
24.00" (610 mm)
05SQ
254, 305, 356
30.00" (762 mm)
3.00" (76 mm)
10, 12, 14
06SQ 10, 12, 14, 16
21.50" (546 mm)
1.66" (42 mm)
254, 305, 356, 406
18.00" (457 mm)
07SQ 10, 12, 14, 16
254, 305, 356, 406

Unit Wt
Lbs
(kg)
78 (35)
85 (39)
86 (39)
100 (45)
117 (53)
125 (57)

2.

W
(Valves 4"-14")
(Valve 16")

4.00"
(102 mm)
2.00"
(51 mm)

Primary
Airflow
Valves 4" & 5"
6.50"
(165 mm)

Flow Ring
Tubing

4.00"
(102 mm)

Air
Valve

18.875" Max.
(479 mm)

7.
Actuator, Controller and
Fan Controls located in this area

L

7.

Airflow
Plenum Inlet

4.

Fan Size

TOP VIEW

Filter

Airflow
Discharge Outlet

Panel slides
for Motor access

5.50" Max.
(140 mm)

Filter Size

02SQ

14" x 14" x 1"
(356 mm x 356 mm x 25 mm)

03SQ
04SQ
05SQ

16" x 20" x 1"
(406 mm x 508 mm x 25 mm)

06SQ
07SQ

20" x 20" x 1"
(508 mm x 508 mm x 25 mm)

NOTES:
1. Allow a minimum 6" (152 mm) plenum inlet clearance for
unducted installations.
2. See Installation Documents for exact hanger bracket location.
3. Air valve centered between top and bottom panel.

11.30" Max.
(287 mm)

B

H

4. For motor access, remove bottom screw on hanger brackets
to slide panel as shown in drawing.
5. Attenuator option not available with this unit layout.

7.

D

6. All high & low voltage controls have same-side NEC jumpback
clearance. (Left-hand shown, right-hand/mirror image optional.)
7. Maximum
Maximumdimensions
dimensionsfor
forcontrols
controlsarea
areashown.
shown.Configurations and
types of control boxes vary according to control types selected.

A

C

DISCHARGE VIEW

VAV-PRC012-EN

109

Dimensional Data

110

VAV-PRC012-EN

Dimensional Data

NARROW CORRIDOR DESIGN SERIES COOLING (VSCF) WITHOUT ATTENUATOR

NOTES:
1. Allow a minimum 6" (152 mm) plenum inlet
clearance for unducted installations.
2. See installation Documents for exact hanger bracket location.
3. Air valve centered between top and bottom panel.
4. For Motor access, remove bottom screw on hanger
brackets to slide panel as shown in drawing.
5. Attenuator option not available with this unit layout.
6. All high & low voltage controls have same-side NEC
jumpback clearance. (unit shown w/left hand high &
low voltage box connections [high voltage inlet facing].
Right hand connections available.)
7. Maximum dimensions for controls are shown.

VAV-PRC012-EN

111

Dimensional Data

112

VAV-PRC012-EN

Dimensional Data

SERIES HOT WATER (VSWF) WITHOUT ATTENUATOR
INLET SIZE
INLET SIZE
DISCHARGE DIMENSIONS
Unit Wt
FAN AVAILABILITY
AVAILABILITY
L
H
W
Lbs
E
C
D
SIZE NOMINAL Ø
NOMINAL Ø
B
A
(kg)
INCHES
(mm)
5.00"
(127
mm)
14.00"
(356
mm)
02SQ 4, 5, 6, 8, 10 104, 127, 152, 203, 254 15.50" (394 mm) 22.00" (559 mm) 34.00" (864 mm) 12.00" (305 mm)
.65" (17 mm) 6.75" (171 mm) 78 (35)
03SQ 6, 8, 10, 12
152, 203, 254, 305
17.50" (445 mm) 24.00" (610 mm) 40.00" (1016 mm) 19.00" (483 mm) 16.00" (406 mm) 2.50" (64 mm) .75" (19 mm) 10.75" (273 mm) 85 (39)
04SQ 6, 8, 10, 12, 14 152, 203, 254, 305, 356
86 (39)
24.00" (610 mm)
05SQ 10, 12, 14
254, 305, 356
30.00" (762 mm)
3.00" (76 mm)
100 (45)
06SQ 10, 12, 14, 16
21.50" (546 mm)
1.66" (42 mm) 6.75" (171 mm) 117 (53)
254, 305, 356, 406
18.00" (457 mm)
07SQ 10, 12, 14, 16
125 (57)
254, 305, 356, 406

2.

W
(Valves 4"-14")

4.00"
(102 mm)

(Valve 16")

2.00"
(51 mm)

Primary
Airflow

Valves 4" & 5"
6.50"
(165 mm)

Flow Ring
Tubing

4.00"
(102 mm)

Air
Valve

18.875" Max.
(479 mm)

9.
Actuator, Controller and
Fan Controls located in this area
L
9.

4.

Airflow
Plenum Inlet

Fan Size

Filter
3.00" x 7.00"
(76 mm x 178 mm)
Coil Access

Water Coil

Panel slides
for Motor access

E

Filter Size

02SQ

14" x 14" x 1"
(356 mm x 356 mm x 25 mm)

03SQ
04SQ
05SQ

16" x 20" x 1"
(406 mm x 508 mm x 25 mm)

06SQ
07SQ

20" x 20" x 1"
(508 mm x 508 mm x 25 mm)

Coil Connection

TOP VIEW

Airflow
Discharge Outlet

NOTES:
1. Allow a minimum 6" (152 mm) plenum inlet clearance for
unducted installations.
2. See Installation Documents for exact hanger bracket location.

5.50" Max.
(140 mm)

3. Air valve centered between top and bottom panel.
4. For motor access, remove bottom screw on hanger brackets
to slide panel as shown in drawing.
5. Attenuator option not available with this unit layout.

11.30" Max.
(287 mm)

B

H

6. Heating coil uninsulated. External insulation may be fieldsupplied and installed as required.
7. Rotate coil 180 for right-hand coil connection.
8. All high & low voltage controls have same-side NEC jumpback
clearance. (Left-hand shown, right-hand/mirror image optional.)

9.

D

A

dimensionsfor
forcontrols
controlsarea
areashown.
shown.Configurations and
9. Maximum
Maximum dimensions
types of control boxes vary according to control types selected. See
"Enclosure Details" for specific layout.

C

DISCHARGE VIEW

VAV-PRC012-EN

113

Dimensional Data

114

VAV-PRC012-EN

Dimensional Data

NARROW CORRIDOR DESIGN SERIES HOT WATER (VSWF) WITHOUT ATTENUATOR

NOTES:
1. Allow a minimum 6" (152 mm) plenum inlet
clearance for unducted installations.
2. See Installation Documents for exact hanger
bracket location.
3. Air valve centered between top and bottom panel.
4. For motor access, remove bottom screw on
hanger brackets to slide panel as shown in drawing.
5. Attenuator option not available with this unit layout.
6. Heating coil un-insulated. External insulation may be
field supplied and installed as required.
7. Rotate coil 180° for right hand coil connection.
8. All high & low voltage controls have same-side NEC
jumpback clearance. (unit shown w/left hand high &
low voltage box connections [high voltage inlet facing].
Right hand connections available.)
9. Maximum dimensions for controls area shown.

VAV-PRC012-EN

115

Dimensional Data

116

VAV-PRC012-EN

Dimensional Data

COIL INFORMATION FOR SERIES 1-ROW COIL

VAV-PRC012-EN

117

Dimensional Data

COIL INFORMATION FOR SERIES 2-ROW COILS

118

VAV-PRC012-EN

Dimensional Data

SERIES ELECTRIC (VSEF) WITHOUT ATTENUATOR
INLET SIZE
INLET SIZE
DISCHARGE DIMENSIONS
FAN AVAILABILITY
AVAILABILITY
H
W
L
E
D
SIZE NOMINAL Ø
C
NOMINAL Ø
A
B
(mm)
INCHES
02SQ 4, 5, 6, 8, 10 104, 127, 152, 203, 254 15.50" (394 mm) 22.00" (559 mm) 34.00" (864 mm) 12.00" (305 mm) 10.00" (254 mm) 5.00" (127 mm) 18.00" (457 mm) 18.50" (470 mm)
17.50" (445 mm) 24.00" (610 mm) 40.00" (1016 mm)
03SQ 6, 8, 10, 12
152, 203, 254, 305
12.00" (305 mm) 4.00" (102 mm)
04SQ 6, 8, 10, 12, 14 152, 203, 254, 305, 356
16.00" (406 mm)
4.00" (102 mm) 22.00" (559 mm)
10,
12,
14
05SQ
30.00" (762 mm)
254, 305, 356
10.00" (254 mm)
06SQ 10, 12, 14, 16
21.50" (546 mm)
254, 305, 356, 406
19.00" (483 mm) 14.00" (356 mm) 5.50" (140 mm) 25.00" (635 mm) 17.00" (432 mm)
07SQ 10, 12, 14, 16
254, 305, 356, 406

Unit Wt
Lbs
(kg)
78 (35)
85 (39)
86 (39)
100 (45)
117 (53)
125 (57)

2.

W
4.00"
(102 mm)

(Valves 4"-14")

2.00"
(51 mm)

(Valve 16")

Primary
Airflow
Valves 4" & 5"
6.50"
(165 mm)

Flow Ring
Tubing

4.00"
(102 mm)

Air
Valve

18.875" Max.
(479 mm)

8.
Actuator, Controller and
Fan Controls located in this area

L
8.
Airflow
Plenum Inlet
Filter

4.

1.00"
(25 mm)
2.00"
(51 mm)
0.60"
(15 mm)

Fans
02SQ
Fans
03SQ–05SQ
Fans
06SQ–07SQ
TOP VIEW

Electric
Heater
Panel slides
for Motor access

E

6.20"
(157 mm)

Airflow
Discharge Outlet

A

Filter Size

02SQ

14" x 14" x 1"
(356 mm x 356 mm x 25 mm)

03SQ
04SQ
05SQ

16" x 20" x 1"
(406 mm x 508 mm x 25 mm)

06SQ
07SQ

20" x 20" x 1"
(508 mm x 508 mm x 25 mm)

NOTES:

D

5.50" Max.
(140 mm)

Fan Size

1.50"
Fans
(38 mm)
02SQ
1.50"
Fans
03SQ–05SQ (38 mm)
3.00"
Fans
06SQ–07SQ (76 mm)

C

1. Allow a minimum 6" (152 mm) plenum inlet clearance for
unducted installations.
2. See Installation Documents for exact hanger bracket location.
3. Air valve centered between top and bottom panel.
4. For motor access, remove bottom screw on hanger brackets
to slide panel as shown in drawing.
5. Attenuator option not available with this unit layout.

B
11.30" Max.
(287 mm)

H

6. Heating coil uninsulated. External insulation may be fieldsupplied and installed as required.
7. All high & low voltage controls have same-side NEC jumpback
clearance. (Left-hand shown, right-hand/mirror image optional.)

8.

Maximum dimensions
dimensionsfor
forcontrols
controlsarea
areashown.
shown. Configurations and
8. Maximum
types of control boxes vary according to control types selected. See
"Enclosure Details" for specific layout.

DISCHARGE VIEW

VAV-PRC012-EN

119

Dimensional Data

120

VAV-PRC012-EN

Dimensional Data

VAV-PRC012-EN

121

Dimensional Data

122

VAV-PRC012-EN

Dimensional Data

Low Height Parallel Fan-Powered Terminal Units
LOW-HEIGHT PARALLEL COOLING (LPCF) FAN SIZES 08SQ & 09SQ
INLET SIZE
UNIT WT
INLET SIZE
DISCHARGE DIMENSIONS
FAN
AVAILABILITY
AVAILABILITY
WT LBS
H
W
L
D
SIZE NOMINAL Ø (INCHES) NOMINAL Ø (mm)
(kg)
A
B
08SQ
11.00" (279 mm) 40.00" (1016 mm) 30.00" (762 mm) 19.25" (489 mm) 9.5" (241 mm) 4.00" (102 mm) 69 (31.3)
5, 6, 8
127, 152, 203
09SQ
74 (33.6)
6, 8
152, 203
09SQ
3.25" (83 mm) 83 (37.7)
203 x 356
8 x 14

Optional Attenuator
Field Installed

5.
Actuator, Controller and
Fan Controls located in this area

5.
Actuator, Controller and
Fan Controls located in this area

32.00"
(813 mm)
D

Valve 5"
6.50"
(165 mm)

Airflow
Plenum Inlet
18.00"
(457 mm)

Optional Attenuator
Field Installed

Primary
Airflow

Rectangular Damper
8" x 14"
4.00
(102 mm)

(203 mm X 356 mm)

Rectangular Damper Detail
17.50"
(445 mm)

5.
Actuator, Controller and
Fan Controls located in Enclosure

7.

L

5.00"
(127 mm)

Fan Size

Filter Size

Attn Wt
Wt. Lbs.
(kg)

08SQ
09SQ

10" x 20" x 1"
(254 mm x 508 mm x 25 mm)

10 (4.5)

TOP VIEW

Airflow
Discharge Outlet

NOTES:
1. Allow a minimum 6" (152 mm) plenum inlet clearance for unducted
installations.

W

2. Flanged discharge outlet accepts up to 1" (25 mm) duct flange.
3. Bottom Access panel standard.
4. Air valve centered between top and bottom panel.
H

10.50"
(267 mm)

B

5. Control box enclosure provided with all control types.
6. All high & low voltage controls have same-side NEC jumpback
clearance. (Left-hand shown, right-hand/mirror image optional.)
7. Flange adds 2" to width and length of unit.

A

DISCHARGE VIEW

VAV-PRC012-EN

123

Dimensional Data

LOW-HEIGHT PARALLEL COOLING (LPCF) FAN SIZE 10SQ
INLET SIZE
INLET SIZE
FAN
AVAILABILITY
AVAILABILITY
SIZE NOMINAL Ø (INCHES) NOMINAL Ø (mm)
10SQ

203

8
8 x 14

10SQ

203 x 356

UNIT WT
WT LBS
(kg)
11.50" (292 mm) 40.00" (1016 mm) 50.00" (1270 mm) 19.25" (489 mm) 10.00" (254 mm) 4.00" (102 mm) 90 (41)
3.25" (83 mm) 92 (42)
H

W

DISCHARGE DIMENSIONS

L

B

A

D

4.

6.
Actuator, Controller and
Fan Controls located in this area
20.00"
(508 mm)

20.00"
(508 mm)

Rectangular Damper

D
Flow Ring
tubing

8" x 14"
(203 mm X 356 mm)

Primary
Airflow

4.00
(102 mm)

Air
Valve

Rectangular Damper Detail
6.
Actuator, Controller and
Fan Controls located in this area

4.

18.875" Max.
(479 mm)

L

6.

Airflow
Discharge Outlet

Fan Size

Filter Size

10SQ

10" x 20" x 1"
(254 mm x 508 mm x 25 mm)

TOP VIEW

NOTES:

5.50" Max.
(140 mm)

B

1.
2.
3.
4.
5.

W

11.30" Max.
(287 mm)

Allow a minimum 6" (152 mm) plenum inlet clearance for unducted installations.
Flanged discharge outlet accepts up to a 1" (25 mm) duct flange.
Bottom Access panel standard.
See Installation Documents for exact hanger bracket location.
Air valve centered between top and bottom panel.

6. Maximum dimensions for controls area shown.

H

6.
A

DISCHARGE VIEW

124

VAV-PRC012-EN

Dimensional Data

LOW-HEIGHT PARALLEL HOT WATER (LPWF) FAN SIZES 08SQ & 09SQ
INLET SIZE
INLET SIZE
UNIT WT
DISCHARGE DIMENSIONS
FAN
AVAILABILITY
AVAILABILITY
WT LBS
H
W
L
D
SIZE NOMINAL Ø (INCHES) NOMINAL
(kg)
Ø (mm)
A
B
08SQ
11.00" (279 mm) 40.00" (1016 mm) 30.00" (762 mm) 19.25" (483 mm) 9.50" (241 mm) 4.00" (102 mm) 98 (44.5)
5, 6, 8
127, 152, 203
103 (46.7)
09SQ
6, 8
152, 203
09SQ

3.25" (83 mm) 112 (50.8)

203 x 356

8 x 14

Optional Attenuator
Field Installed

5.
5.

Actuator, Controller and
Fan Controls located in this area

Actuator, Controller and
Fan Controls located in this area

32.00"
(813 mm)
20.00"
(508 mm)
6.80"
(173 mm)
D

Airflow
Plenum Inlet

Valve 5"
6.50"
(165 mm)
Primary
Airflow

Rectangular Damper
8" x 14"
(203 mm x 356 mm)
18.00"
(457 mm)

Optional Attenuator
Field Installed

Rectangular Damper Detail

4.00
(102 mm)

5.
Actuator, Controller and
Fan Controls located in Enclosure

17.50"
(445 mm)

Fan Size

Filter Size

Attn Wt
Wt Lbs
(kg)

08SQ
09SQ

10" x 20" x 1"
(254 mm x 508 mm x 25 mm)

10 (4.5)

L
5.00"
(127 mm)

7.

NOTES:
TOP VIEW

Airflow
Discharge Outlet

1. Allow a minimum 6" (152 mm) plenum inlet clearance for
unducted installations.
2. Flanged discharge outlet accepts up to a 1" (25 mm) duct flange.

W

3. Bottom Access panel standard.
4. Air valve centered between top and bottom panel.
5. Control box enclosure provided with all control types.
6. All high & low voltage controls have same-side NEC jumpback
clearance. (Left-hand shown, right-hand/mirror image optional.)

H

10.50"
(267 mm)

7. Flange adds 2" to width and length of unit.

B

A

DISCHARGE VIEW

VAV-PRC012-EN

125

Dimensional Data

126

VAV-PRC012-EN

Dimensional Data

PARALLEL LOW-HEIGHT HOT WATER (LPWF) COIL ON DISCHARGE
FAN SIZES 08SQ & 09SQ
INLET SIZE
AVAILABILITY
NOMINAL Ø (mm)

INLET SIZE
AVAILABILITY
NOMINAL Ø (INCHES)

FAN
SIZE

DISCHARGE DIMENSIONS
H

L

W

D

A

B

20.00" (508 mm)

10.00" (254 mm)

UNIT WT
WT LBS
(kg)

08SQ

5, 6, 8

127, 152, 203

09SQ

6, 8

152, 203

103 (46.7)

09SQ

8 X 14

203 X 356

3.25" (83 mm) 112 (50.8)

11.00" (279 mm)

40.00" (1016 mm)

30.00" (762 mm)

4.00" (102 mm) 98 (44.5)

Optional Attenuator
Field Installed

5.
Actuator, Controller and
Fan Controls located in this area

5.
Actuator, Controller and
Fan Controls located in this area

32.00"
(813 mm)

D

Airflow
Plenum Inlet

Valve 5"
6.50"
(165 mm)

Primary
Airflow

Rectangular Damper
8" x 14"
18.00"
(457 mm)

Optional Attenuator
Field Installed

(203 mm X 356 mm)

Rectangular Damper Detail

4.00
(102 mm)

5.
Actuator, Controller and
Fan Controls located in Enclosure

17.50"
(445 mm)

Fan Size

Filter Size

Attn Wt
Wt Lbs
(kg)

08SQ
09SQ

10" x 20" x 1"
(254 mm x 508 mm x 25 mm)

10 (4.5)

L
5.00"
(127 mm)

7.

6.80"
(173 mm)

NOTES:
TOP VIEW
20.00"
(508 mm)

1. Allow a minimum 6" (152 mm) plenum inlet clearance for
unducted installations.
2. Flanged discharge outlet accepts up to a 1" (25 mm) duct flange.

Airflow
Discharge Outlet

3. Bottom Access panel standard.
W

4. Air valve centered between top and bottom panel.
5. Control box enclosure provided with all control types.

H

10.50"
(267 mm)

6. All high & low voltage controls have same-side NEC jumpback clearance.
(Left-hand shown, right-hand/mirror image optional.)

B

7. Flange adds 2" to width and length of unit.
A

DISCHARGE VIEW

VAV-PRC012-EN

127

Dimensional Data

Coil Information For Low Height Parallel Inlet-1 Row
Size Inlet/Fan

Coil Connection 1-Row

A

B

L

H

08SQ

3/8" (10 mm) O.D.

9" (229 mm)

2 7/8" (71 mm)

20" (508 mm)

10" (254 mm)

09SQ

3/8" (10 mm) O.D.

9" (229 mm)

2 7/8" (71 mm)

20" (508 mm)

10" (254 mm)

10SQ

.375" (10 mm) O.D.

9.00" (229 mm)

2.80" (71 mm)

20.00" (508 mm)

10.00" (254 mm)

L

OUTLET

A

AIR FLOW

H

AIR FLOW

INLET
B

7/8"
[22mm]

Fan Size

Internal Volume Gal (L)

Operating Weight Lbs (Kg)

08SQ

0.07 (16.7)

9.7 (4.4)

09SQ

0.07 (16.7)

9.7 (4.4)

10SQ

0.07 (.27)

9.7 (4.4)

Notes:
1. Location of coil connections is determined by facing air steam. R.H. Coil connections shown, L.H. not available.
2. Coil furnished with stub sweet connections.

128

VAV-PRC012-EN

Dimensional Data

Coil Information For Low Height Parallel Plenum Inlet 2-Row Coil
Fan Size

Coil Connection 2 Row

A

B

L

H

08SQ

7/8" (22 mm) O.D.

6 1/4" (157 mm)

2 1/8" (55 mm)

20" (508 mm)

10" (254 mm)

09SQ

7/8" (22 mm) O.D.

6 1/4" (157 mm)

2 1/8" (55 mm)

20" (508 mm)

10" (254 mm)

10SQ

.875" (22 mm) O.D.

6.20" (157 mm)

2.18" (55 mm)

20.00" (508 mm)

10.00" (254 mm)

Fan Size

Internal Volume Gal (L)

Operating Weight Lbs (Kg)

08SQ

0.16 (39.0)

13.7 (6.2)

09SQ

0.16 (39.0)

13.7 (6.2)

10SQ

0.16 (.61)

13.7 (6.2)

Notes:
1. Location of coil connections is determined by facing air steam. R.H. Coil connections shown, L.H. not available.
2. Coil furnished with female sweat connections.
3.
0.85" lip NOT on 08SQ or 09SQ units.

VAV-PRC012-EN

129

Dimensional Data

Coil Information For Low Height Parallel Discharge 1-Row Coil
Fan Size

Coil Connection

A

B

L

H

W

08SQ

3/8" (10 mm) O.D.

9.00" (229 mm)

1.65" (42 mm)

20.00" (508 mm)

10.00" (254 mm)

6.75" (171 mm)

09SQ

3/8" (10 mm) O.D.

9.00" (229 mm)

1.65" (42 mm)

20.00" (508 mm)

10.00" (254 mm)

6.75" (171 mm)

Fan Size

Internal Volume Gal (L)

Operating Weight Lbs (Kg)

08SQ

0.07 (.28)

9.7 (4.4)

09SQ

0.07 (.28)

9.7 (4.4)

Notes:
1. Location of coil connections is determined by facing air stream. L.H. Coil connections shown, R.H. opposit.
2. Coil furnished with stub sweat connections.
3. Coil is rotated to achieve opposite hand connection. Note: Water inlet is always on the bottom and outlet on the top.
4. Access Panel is standard.

130

VAV-PRC012-EN

Dimensional Data

Coil Information For Low Height Parallel Discharge 2 Row Coil
Fan Size

Coil Connection

A

B

L

H

W

08SQ

7/8" (22 mm) O.D.

6.25" (159 mm)

2.00 (51 mm)

20.00" (508 mm)

10.00" (254 mm)

6.75" (171 mm)

09SQ

7/8" (22 mm) O.D.

6.25" (159 mm)

2.00 (51 mm)

20.00" (508 mm)

10.00" (254 mm)

6.75" (171 mm)

Fan Size

Internal Volume Gal (L)

Operating Weight Lbs (Kg)

08SQ

0.17 (.64)

13.7 (6.2)

09SQ

0.17 (.64)

13.7 (6.2)

Notes:
1. Location of coil connections is determined by facing air stream. L.H. Coil connections shown, R.H. opposite.
2. Coil furnished with stub sweat connections.
3. Use port at bottom for inlet and port at top for outlet. For 2-row coils, always plumb in counter flow orientation: Left hand
unit's water inlet on bottom, and outlet on the top. Right hand unit’s water inlet on top and outlet on bottom.
4. Access Panel is standard.

VAV-PRC012-EN

131

Dimensional Data

LOW-HEIGHT PARALLEL ELECTRIC HEAT (LPEF) FAN SIZES 08SQ & 09SQ
INLET SIZE
INLET SIZE
FAN
AVAILABILITY
AVAILABILITY
SIZE NOMINAL Ø (INCHES) NOMINAL Ø (mm)
08SQ
09SQ

5, 6, 8
6, 8

127, 152, 203

09SQ

8 x 14

203 x 356

152, 203

UNIT WT
WT LBS
D
(kg)
A
B
11.00" (279 mm) 40.00" (1016 mm) 30.00" (762 mm) 19.00" (483 mm) 9.50" (241 mm) 4.00" (102 mm) 104 (47.2)
109 (49.4)
DISCHARGE DIMENSIONS

H

W

L

3.25" (83 mm) 118 (53.5)

Optional Attenuator
Field Installed

5.

5.

Actuator, Controller and
Fan Controls located in Enclosure

Actuator, Controller and
Fan Controls located in Enclosure

32.00"
(813 mm)
D
Valve 5"
6.50"
(165 mm)

Airflow
Plenum Inlet

Primary
Airflow

18.00"
(457 mm)

Optional Attenuator
Field Installed

Rectangular Damper
8" x 14"

4.00
(102 mm)

(203 mm X 356 mm)
17.50"
(445 mm)

Rectangular Damper Detail
5.
Actuator, Controller and
Fan Controls located in Enclosure

5.00"
(127 mm)

7.

Terminal Box

20.00"
(508 mm)

L

Heater
6.00"
(152 mm)

Fan Size

Filter Size

Atten Wt
Lbs
(kg)

08SQ
09SQ

10" x 20 " x 1"
(254 mm x 508 mm x 25 mm)

10 (4.5)

TOP VIEW

Airflow
Discharge Outlet

W

H

10.50"
(267 mm)

NOTES:
1.
2.
3.
4.
5.
6.

B

Allow a minimum 6" (152 mm) plenum inlet clearance for unducted installations.
Flanged discharge outlet accepts up to a 1" (25 mm) duct flange.
Bottom Access panel standard.
Air valve centered between top and bottom panel.
Control box enclosure provided with all control types.
All high & low voltage controls have same-side NEC jumpback clearance. (Left-hand
shown, right-hand/mirror image optional.)

7. Flange adds 2" to width and length of unit.
A

DISCHARGE VIEW

132

VAV-PRC012-EN

Dimensional Data

LOW-HEIGHT PARALLEL ELECTRIC (LPEF) FAN SIZE 10SQ

VAV-PRC012-EN

133

Dimensional Data

Low Height Series Fan-Powered Terminal Units
LOW-HEIGHT SERIES COOLING ONLY (LSCF) FAN SIZES 08SQ & 09SQ
INLET SIZE
INLET SIZE
DISCHARGE DIMENSIONS
AVAILABILITY
D
AVAILABILITY
W
L
H
B
A
NOMINAL Ø (inches) NOMINAL Ø (mm)
08SQ
5, 6, 8
127, 152, 203 11.00" (279 mm) 26.00" (660 mm) 40.00" (1016 mm) 18.00" (457 mm) 10.00" (254 mm) 4.00" (102 mm)
152, 203
09SQ
6, 8
4.50" (114 mm)
203 x 355
09SQ
8 x 14
FAN
SIZE

Unit Wt
Lbs
(kg)
86 (39)
96 (44)
105 (47)

Optional Attenuator
Field Installed

4.

Actuator, Controller and
Fan Controls located in Enclosure
32.00"
(813 mm)

4.

Actuator, Controller and
Fan Controls located in Enclosure
Airflow
Plenum Inlet

D
Primary
Airflow

Valve 5"
6.50"
(165 mm)
18.00"
(457 mm)

Optional Attenuator
Field Installed
Air
Valve

4.00
(102 mm)

Rectangular Damper
8" x 14"
(203 mm x 356 mm)

17.50"
(445 mm)

Rectangular Damper Detail
4.

Actuator, Controller and
Fan Controls located in Enclosure

5.00"
(127 mm)

L

Fan Size

Filter Size

Atten Wt
Lbs
(kg)

08SQ
09SQ

10" x 10" x 1"
(254 mm x 254 mm x 25 mm)

10 (4.5)

7.

NOTES:
1. Allow a minimum 6" (152 mm) plenum inlet clearance for
unducted installations.
2. Flanged discharge outlet accepts up to a 1" (25 mm) duct flange.
Airflow
Discharge Outlet

3. Bottom Access panel standard.

TOP VIEW

4. Control box enclosure provided with all control types.
5. Air valve centered between top and bottom panel.

W

6. All high & low voltage controls have same-side NEC jumpback
clearance. (Left-hand shown, right-hand/mirror image optional.)
7. Flange adds 2" to width and length of unit.
10.50"
(267 mm)

B

A
DISCHARGE VIEW

134

H

1.00"
(25 mm)

VAV-PRC012-EN

Dimensional Data

LOW-HEIGHT SERIES COOLING (LSCF) FAN SIZE 10SQ
UNIT WT
INLET SIZE
INLET SIZE
DISCHARGE DIMENSIONS
FAN
WT LBS
AVAILABILITY
AVAILABILITY
H
W
L
C
D
SIZE NOMINAL
(kg)
Ø (INCHES) NOMINAL Ø (mm)
A
B
10SQ
11.00" (279 mm) 48.00" (1219 mm) 36.00" (914 mm) 38.00" (965 mm) 10.00" (254 mm) 4.00" (102 mm) 20.00" (508 mm) 120 (54)
203
8
10SQ

8 x 14

17.50" (445 mm) 130 (59)

203 x 356

Optional Attenuator
Field Installed

Optional Attenuator
Field Installed

2.

8.

Actuator, Controller and
Fan Controls located in Enclosure

8.

Actuator, Controller and
Fan Controls located in Enclosure

2.

32.00"
(813 mm)

32.00"
(813 mm)

Optional Attenuator
Field Installed
18.00"
(457 mm)

Optional Attenuator
Field Installed
D

Primary
Airflow
Airflow
Plenum Inlet

Airflow
Plenum Inlet

Rectangular Damper Detail

C

Rectangular Damper
8" x 14"
(203 mm x 356 mm)

17.50"
(445 mm)

L

Fan Size

Filter Size

Atten Wt
Lbs
(kg)

10SQ

10" x 16" x 1"
(254 mm x 406 mm x 25 mm)

20 (9)

5.00"
(127 mm)

9.

NOTES:

W

1. Allow a minimum 6" (152 mm) plenum inlet clearance for
unducted installations.
2. Filter location with optional Attenuator.

Airflow
Discharge Outlet

3. Attenuator-factory assembled, field installed.
4. Air valve centered between top and bottom panel.
TOP VIEW

5. Heating coil uninsulated. External insulation may be field
supplied and installed as required.
6. All high & low voltage controls have same-side NEC jumback
clearance. (Left-hand shown, right-hand/mirror image optional.)
7. Bottom Access panel standard.

H

B

8. Control box enclosure provided with all control types.

10.50"
(267 mm)

9. Flange adds 2" to width and length of unit.

A
DISCHARGE VIEW

VAV-PRC012-EN

135

Dimensional Data

LOW-HEIGHT SERIES HOT WATER (LSWF) FAN SIZES 08SQ & 09SQ
INLET SIZE
INLET SIZE
DISCHARGE DIMENSIONS
AVAILABILITY
AVAILABILITY
D
H
W
L
NOMINAL Ø (INCHES) NOMINAL Ø (mm)
B
A
5, 6, 8
08SQ
11.00" (279 mm) 26.00" (660 mm) 40.00" (1016 mm) 18.00" (457 mm) 10.00" (254 mm) 4.00" (102 mm)
127, 152, 203
6, 8
152, 203
09SQ
4.50" (114 mm)
8 x 14
203 x 355
09SQ
FAN
SIZE

Unit Wt
Lbs
(kg)
95 (43)
105 (48)
114 (52)

Optional Attenuator
Field Installed

4.

Actuator, Controller and
Fan Controls located in Enclosure
32.00"
(813 mm)
4.

Airflow
Plenum Inlet

D
Primary
Airflow

Actuator, Controller and
Fan Controls located in Enclosure

Valve 5"
6.50"
(165 mm)
18.00"
(457 mm)

Optional Attenuator
Field Installed
Air
Valve

4.00
(102 mm)

17.50"
(445 mm)

Rectangular Damper
8" x 14"
(203 mm x 356 mm)

Rectangular Damper Detail
4.
5.00"
(127 mm)

Actuator, Controller and
Fan Controls located in Enclosure

L

Fan Size

Filter Size

08SQ
09SQ

10" x 10" x 1"
(254 mm x 254 mm x 25 mm)

Atten Wt
Lbs
(kg)
10 (4.5)

8.

TOP VIEW

Water
Coil

6.80"
(173 mm)

NOTES:
1. Allow a minimum 6" (152 mm) plenum inlet clearance for
unducted installations.

Airflow
Discharge Outlet

2. Flanged discharge outlet accepts up to a 1" (25 mm)
duct flange.
W

3. Bottom Access panel standard.
4. Control box enclosure provided with all control types.
5. Air valve centered between top and bottom panel.

10.50"
(267 mm)

B

H

6. Heating coil uninsulated. External insulation may be field
supplied and installed as required.
7. All high & low voltage controls have same-side NEC
jumpback clearance. (Left-hand shown, right-hand/mirror
image optional.)

A
DISCHARGE VIEW

136

8. Flange adds 2" to width and length of unit.
1.00"
(25 mm)

VAV-PRC012-EN

Dimensional Data

LOW-HEIGHT SERIES HOT WATER (LSWF) FAN SIZE 10SQ
INLET SIZE
INLET SIZE
DISCHARGE DIMENSIONS
FAN
AVAILABILITY
AVAILABILITY
H
W
L
C
D
SIZE NOMINAL
Ø (INCHES) NOMINAL Ø (mm)
A
B
11.00" (279 mm) 48.00" (1219 mm) 36.00" (914 mm) 38.00" (965 mm) 10.00" (254 mm) 4.00" (102 mm) 20.00" (508 mm)
10SQ
8
203
10SQ
8 x 14
203 x 356
17.50" (445 mm)

UNIT WT
WT LBS
(kg)
136 (62)
146 (66)

Optional Attenuator
Field Installed

Optional Attenuator
Field Installed

2.

8.

8.

Actuator, Controller and
Fan Controls located in Enclosure

Actuator, Controller and
Fan Controls located in Enclosure

2.
32.00"
(813 mm)

32.00"
(813 mm)

Optional Attenuator
Field Installed
18.00"
(457 mm)

Optional Attenuator
Field Installed
D

Primary
Airflow

Airflow
Plenum Inlet

Airflow
Plenum Inlet

Rectangular Damper Detail
Rectangular Damper
8" x 14"
(203 mm x 356 mm)

C

8.
17.50"
(445 mm)

Actuator, Controller and
Fan Controls located in Enclosure

9.

L

5.00"
(127 mm)

6.80"
(173 mm)

Fan Size

Filter Size

Atten Wt
Lbs
(kg)

10SQ

10" x 16" x 1"
(254 mm x 406 mm x 25 mm)

20 (9)

NOTES:
1. Allow a minimum 6" (152 mm) plenum inlet clearance for
unducted installations.

W

2. Filter location with optional Attenuator.
3. Attenuator-factory assembled, field installed.

Airflow
Discharge Outlet

4. Air valve centered between top and bottom panel.
5. Heating coil uninsulated. External insulation may be field
supplied and installed as required.

TOP VIEW

6. All high & low voltage controls have same-side NEC
jumpback clearance. (Left-hand shown, right-hand/mirror
image optional.)
7. Bottom Access panel standard.
8. Control box enclosure provided with all control types.
10.50"
(267 mm)

B

H

9. Flange adds 2" to width and length of unit.

A
DISCHARGE VIEW

VAV-PRC012-EN

137

Dimensional Data

138

VAV-PRC012-EN

Dimensional Data

VAV-PRC012-EN

139

Dimensional Data

LOW-HEIGHT SERIES ELECTRIC HEAT (LSEF) FAN SIZES 08SQ & 09SQ
INLET SIZE
INLET SIZE
Unit Wt
DISCHARGE DIMENSIONS
Lbs
W
AVAILABILITY
AVAILABILITY
L
H
D
B
(kg)
A
NOMINAL
Ø (mm)
NOMINAL Ø (INCHES)
5, 6, 8
127, 152, 203
08SQ
11.00" (279 mm) 26.00" (660 mm) 40.00" (1016 mm) 14.00" (356 mm) 9.00" (229 mm) 4.00" (102 mm) 101 (45.8)
6, 8
152, 203
09SQ
111 (50.3)
4.50" (114 mm) 120 (54.4)
8 x 14
203 x 355
09SQ
FAN
SIZE

Optional Attenuator
Field Installed

4.

Actuator, Controller and
Fan Controls located in Enclosure
32.00"
(813 mm)

D
Primary
Airflow

4.

Actuator, Controller and
Fan Controls located in Enclosure

Airflow
Plenum Inlet

Valve 5"
6.50"
(165 mm)

18.00"
(457 mm)

Optional Attenuator
Field Installed

4.00
(102 mm)

Air
Valve

17.50"
(445 mm)

Rectangular Damper
8" x 14"
(203 mm x 356 mm)

Rectangular Damper Detail
4.

5.00"
(127 mm)

L

Actuator, Controller and
Fan Controls located in Enclosure

Fan Size

Filter Size

Atten Wt
Lbs
(kg)

8.

08SQ
09SQ

Electric

10" x 10" x 1"
(254 mm x 254 mm x 25 mm)

10 (4.5)

NOTES:

Heater

TOP VIEW

1. Allow a minimum 6" (152 mm) plenum inlet clearance for unducted installations.
20.00"
(508 mm)

2. Flanged discharge outlet accepts up to 1" (25 mm) duct flange.
3. Bottom Access panel standard.
4. Control box enclosure provided with all control types.
5. Air valve centered between top and bottom panel.
Airflow
Discharge Outlet

6. Heating coil uninsulated. External insulation may be field supplied and
installed as required.

20.00"
(508 mm)

7. All hight & low voltage controls have same-side NEC jumpback clearance.
(Left-hand shown, right-hand/mirror image optional.)
B

10.50"
(267 mm)

H

A

140

8. Flange adds 2" to width and length of unit.

DISCHARGE VIEW

VAV-PRC012-EN

Dimensional Data

LOW-HEIGHT SERIES ELECTRIC (LSEF) FAN SIZE 10SQ
INLET SIZE
INLET SIZE
DISCHARGE DIMENSIONS
AVAILABILITY
AVAILABILITY
C
D
H
W
L
NOMINAL Ø (INCHES) NOMINAL Ø (mm)
A
B
8
10SQ
203
11.00" (279 mm) 48.00" (1219 mm) 36.00" (914 mm) 19.00" (483 mm) 9.50" (241 mm) 4.00" (102 mm) 20.00" (508 mm)
17.50" (445 mm)
203 x 356
8 x14
10SQ
FAN
SIZE

UNIT WT
WT LBS
(kg)
145 (65.8)
155 (70.3)

Optional Attenuator
Field Installed

Optional Attenuator
Field Installed

2.

8.

8.

Actuator, Controller and
Fan Controls located in Enclosure

Actuator, Controller and
Fan Controls located in Enclosure

2.

32.00"
(813 mm)

32.00"
(813 mm)

Optional Attenuator
Field Installed
18.00"
(457 mm)

Optional Attenuator
Field Installed
Primary
Airflow

D
Airflow
Plenum Inlet

Rectangular Damper Detail

Airflow
Plenum Inlet

Rectangular Damper
8" x 14"
(203 mm x 356 mm)

C

8.

Actuator, Controller and
Fan Controls located in Enclosure

17.50"
(445 mm)

W

L

Fan Size

Filter Size

Atten Wt (Qty 2)
Lbs
(kg)

10SQ

10" x 16" x 1"
(254 mm x 406 mm x 25 mm)

20 (9.1)

5.00"
(127 mm)

24.00"
(610 mm)

Terminal Box

9.

11.00"
(279 mm)

Plenum Area

NOTES:
8.00"
(203 mm)

Heater

1. Allow a minimum 6" (152 mm) plenum inlet clearance for
unducted installations.
2. Filter location with optional Attenuator.
3. Attenuator-factory assembled, field installed.

Airflow
Discharge Outlet

TOP VIEW

4. Air valve centered between top and bottom panel.
5. Heating coil uninsulated. External insulation may be field supplied
and installed as required.
6. All high & low voltage controls have same-side NEC jumpback
clearance. (Left-hand shown, right-hand/mirror image optional.)
7. Bottom Access panel standard.
8. Control box enclosure provided with all control types.

H

B

9. Flange adds 2" to width and length of unit.

10.50"
(267 mm)

A

VAV-PRC012-EN

DISCHARGE VIEW

141

Mechanical Specifications: Fan-Powered
MODELS: VPCF, VPWF, VPEF, VSCF, VSWF, VSEF, LPCF, LPWF, LPEF,
LSCF, LSWF, & LSEF
VP, LP = Parallel Fan Powered Units
VS, LS = Series Fan Powered Units
Note: L = Low Height

Model Break Downs
•

VPCF, VSCF, LPCF, & LSCF = Cooling Only

•

VPWF, VSWF, LPWF, & LSWF = With Hot Water Coil

•

VPEF, VSEF, LPEF, & LSEF = With Electric Coil

CASING
22-gage galvanized steel. Hanger brackets, side access (standard height - V model numbers) or
bottom access (low height - L model numbers), and plenum filter are provided as standard.

AGENCY LISTING
The unit is UL and Canadian UL Listed as a room air terminal unit. Control # 9N65.
AHRI 880 Certified.

INSULATION
1/2" (12.7 mm) Matte-faced Insulation—. The interior surface of the unit casing is
acoustically and thermally lined with ½-inch, 1.5 lb/ft3 (12.7 mm, 24.0 kg/m3) composite density
glass fiber with a high-density facing.The insulation R-Value is 1.9.The insulation is UL listed and
meets NFPA-90A and UL 181 standards.There are no exposed edges of insulation (complete metal
encapsulation).

1" (25.4 mm) Matte-faced Insulation—. The interior surface of the unit casing is acoustically
and thermally lined with 1 inch, 1.0 lb/ft3 (25.4 mm, 16.0 kg/m3) composite density glass fiber with
a high-density facing.The insulation R-Value is 3.85.The insulation is UL listed and meets NFPA90A and UL 181 standards.There are no exposed edges of insulation (complete metal
encapsulation).

1" (25.4 mm) Foil-faced Insulation—. The interior surface of the unit casing is acoustically and
thermally lined with 1-inch, 1.5 lb/ft3 (25.4 mm, 24.0 kg/m3) density glass fiber with foil facing.The
insulation R-Value is 4.1.The insulation is UL listed and meets NFPA-90A and UL 181 standards as
well as bacteriological standard ASTM C 665.There are no exposed edges of insulation (complete
metal encapsulation).
1" (25.4 mm) Double-wall Insulation—. The interior surface of the unit casing is acoustically
and thermally lined with a 1-inch, 1.0 lb./ft3 (25.4 mm, 16.0 kg/m3) composite density glass fiber
with high-density facing.The insulation R-value is 3.8.The insulation is UL listed and meets NFPA90A and UL 181 standards.The insulation is covered by an interior liner made of 26-gage galvanized
steel. All wire penetrations are covered by grommets.There are no exposed edges of insulation
(complete metal encapsulation).
3/8" (9.5 mm) Closed-cell Insulation—. The interior surface of the unit casing is acoustically
and thermally lined with 3/8-inch, 4.4 lb/ft3 (9.5 mm, 70.0 kg/m3) closed-cell insulation.The
insulation is UL listed and meets NFPA-90A and UL 181 standards.The insulation has an R-Value
of 1.4.There are no exposed edges of insulation (complete metal encapsulation).
PRIMARY AIR VALVE

Air Valve Round—. The primary air inlet connection is an 18-gage galvanized steel cylinder sized
to fit standard round duct. A multiple-point, averaging flow sensing ring is provided with balancing
142

VAV-PRC012-EN

Mechanical Specifications: Fan-Powered

taps for measuring +/-5% of unit cataloged airflow. An airflow-versus-pressure differential
calibration chart is provided.The damper blade is constructed of a closed-cell foam seal that is
mechanically locked between two 22-gage galvanized steel disks.The damper blade assembly is
connected to a cast zinc shaft supported by self-lubricating bearings.The shaft is cast with a
damper position indicator.The valve assembly includes a mechanical stop to prevent overstroking. At 4 in. wg, air valve leakage does not exceed 1% of cataloged airflow.

Air Valve Rectangular. —Inlet collar is constructed of 22-gage galvanized steel sized to fit
standard rectangular duct. An integral multiple-point, averaging flow-sensing ring provides
primary airflow measurement within +/-5% of unit cataloged airflow. Damper is 22-gage galvanized
steel.The damper blade assembly is connected to a solid metal shaft supported by self-lubricating
bearings.The shaft is cast with a damper position indicator.The valve assembly includes a
mechanical stop to prevent over-stroking. At 3.0 in. wg, air valve leakage does not exceed 44 cfm
(21 L/s).
Table 135. Fan-inlet combinations
VPXF
02SQ

5"

X

6"

X

X

8"

X

X

X

10"

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

12"

03SQ

04SQ

LSXF

Inlet

05SQ

06SQ

07SQ

08SQ

09SQ

10SQ

X

X

14"
16"

X

X

X

X

8 x 14"

X

X

Attenuators
The attenuator is 22-gage galvanized steel with an internal acoustical liner. Attenuators have been
tested in accordance with AHRI 880 standards.

Fan Motor
PSC—. Single-speed, direct-drive, permanent split capacitor type.Thermal overload protection
provided. Motors will be designed specifically for use with an open SCR. Motors will accommodate
anti-backward rotation at start up. Motor and fan assembly are isolated from terminal unit.
ECM—. Electrically Commutated Motor is designed for high-efficient operation with over 70%
efficiency throughout the operating range.

FAN SPEED CONTROL
Variable Speed Control Switch (SCR)—. The SCR speed control device is provided as
standard and allows the operator infinite fan speed adjustment.

Transformer
The 50-VA transformer is factory-installed in the fan control box to provide 24 VAC for controls.

Disconnect Switch
A toggle disconnect is provided as standard and allows the operator to turn the unit on or off by
toggling to the appropriate setting.This switch breaks both legs of power to the fan and the
electronic controls (if applicable)
Note: Not provided on Low Height units with pneumatic controls.

VAV-PRC012-EN

143

Mechanical Specifications: Fan-Powered

Outlet Connection
Flanged Connection—Rectangular opening on unit discharge to accept 90° flanged ductwork
connection.

Filter
A 1" (25 mm) filter is provided on the plenum inlet and attaches to the unit with a filter frame.

Hot Water Coil
Parallel Water Coils—. factory- installed on the plenum inlet.The coil has 1-row with 144
aluminum-plated fins per foot (.305 m), and if needed 2-row with 144 aluminum-plated fins per foot
(.305 m). Full fin collars provided for accurate fin spacing and maximum fin-tube contact.The 3/
8" (9.5 mm) OD seamless copper tubes are mechanically expanded into the fin collars. Coils are
proof tested at 450 psig (3102 kPa) and leak tested at 300 psig (2068 kPa) air pressure under water.
Coil connections are brazed.

Series Water Coils. —factory-installed on the fan discharge.The coil has 1-row with 144
aluminum-plated fins per foot (.305 m) and, if needed, 2-row with 144 aluminum-plated fins per foot
(.305 m). Full fin collars provided for accurate fin spacing and maximum fin-tube contact.The 3/
8" (9.5 mm) OD seamless copper tubes are mechanically expanded into the fin collars. Coils are
proof tested at 450 psig (3102 kPa) and leak tested at 300 psig (2068 kPa) air pressure under water.
Coil connections are brazed. Gasketed access panels, which are standard, are attached with screws.

Electric Heat Coil
The electric heater is a factory-provided and installed, UL recognized resistance open-type heater.
It also contains a disc-type automatic pilot duty thermal primary cutout, and manual reset load
carrying thermal secondary device. Heater element material is nickel-chromium.The heater
terminal box is provided with 7/8" (22 mm) knockouts for customer power supply.Terminal
connections are plated steel with ceramic insulators. All fan-powered units with electric reheat are
single-point power connections.

Electric Heat Options
Silicon-Controlled Rectifier (SCR). Optional electric heat control that provides modulation.
Magnetic Contactor. Optional electric heater 24V contactor for use with direct digital controls.
Mercury Contactor. Optional electric heater 24V contactor for use with direct digital controls.
P.E. Switch with Magnetic Contactor. This optional switch and magnetic contactor is for use
with pneumatic controls.

P.E. Switch with Mercury Contactor. This optional switch and mercury contactor is for use
with pneumatic controls.

Airflow Switch. Optional air pressure device designed to disable heater when system fan is off.
Power Fuse. If a power fuse is chosen with a unit containing electric heat, then a safety fuse is
located in the electric heater’s line of power to prevent power surge damage to the electric heater.
Any electric heat unit with a calculated MCA greater than or equal to 30 will have a fuse provided.

Disconnect Switch. A standard factory-provided door interlocking disconnect switch on the
heater control panel disengages primary voltage to the terminal.

Unit Controls Sequence Of Operation
Parallel
The unit controller continuously monitors the zone temperature against its setpoint and varies the
primary airflow as required to meet zone setpoints. Airflow is limited by minimum and maximum

144

VAV-PRC012-EN

Mechanical Specifications: Fan-Powered

position set points. For a parallel unit, the controller will intermittently start the fan upon a call for
heat. Upon a further call for heat, reheat is enabled.
1. Primary Airflow—The fan energizes when primary airflow drops below the fan setpoint airflow.
The fan automatically starts when the zone temperature drops to the heating temperature
setpoint.
2. ZoneTemperature—The fan energizes when the zone temperature drops to a selectable
number of degrees above the heating temperature setpoint.
Series
The controller will start and run the fan continuously during the occupied mode and intermittently
during the unoccupied mode. Upon a further call for heat, any hot water or electric heat associated
with the unit is enabled.

Direct Digital Controls
DDC Actuator—. Trane 3-wire, 24-VAC, floating-point quarter turn control actuator with linkage
release button. Actuator has a constant drive rate independent of load, a rated torque of 35 in-lb,
a 90-second drive time, and is non-spring return.Travel is terminated by end stops at fully-opened
and -closed positions. An integral magnetic clutch eliminates motor stall.
DDC Actuator - Belimo — LMB24-3-TTN 3-wire, 24 VAC/DC, floating-point, quarter turn actuator
with linkage release button. Actuator has a constant drive rate independent of load, a rated torque
of 45 in-lb, a 95 second drive time, and is non-spring return.Travel is terminated by end stops at
fully-opened and -closed positions. Internal electronic control prevents motor stall when motor
reaches end stops.

Direct Digital Controller—. The microprocessor-based terminal unit controller provides
accurate, pressure-independent control through the use of a proportional integral control
algorithm and direct digital control technology.The controller, named the Unit Control Module
(UCM), monitors zone temperature setpoints, zone temperature and its rate of change, and valve
airflow using a differential pressure signal from the pressure transducer. Additionally, the
controller can monitor either supply duct air temperature or CO2 concentration via appropriate
sensors.The controller is provided in an enclosure with 7/8" (22 mm) knockouts for remote control
wiring. ATrane UCM zone sensor is required.
DDC Zone Sensor—. The UCM controller senses zone temperature through a sensing element
located in the zone sensor. In addition to the sensing element, zone sensor options may include an
externally-adjustable setpoint, communications jack for use with a portable edit device, and an
override button to change the individual controller from unoccupied to occupied mode.The
override button has a cancel feature that will return the system to unoccupied. Wired zone sensors
utilize a thermistor to vary the voltage output in response to changes in the zone temperature.
Wiring to the UCM controller must be 18- to 22-awg. twisted pair wiring.The setpoint adjustment
range is 50–88ºF (10–31°C). Depending upon the features available in the model of sensor selected,
the zone sensor may require from a 2-wire to a 5-wire connection.Wireless zone sensors report the
same zone information as wired zone sensors, but do so using radio transmitter technology.
Therefore with wireless, wiring from the zone sensor to the UCM is unnecessary.
Digital Display Zone Sensor with Liquid Crystal Display (LCD)—. The digital display zone
sensor contains a sensing element, which sends a signal to the UCM. A Liquid Crystal Display (LCD)
displays setpoint or space temperature. Sensor buttons allow the user to adjust setpoints, and
allow space temperature readings to be turned on or off.The digital display zone sensor also
includes a communication jack for use with a portable edit device, and an override button to change
the UCM from unoccupied to occupied.The override button has a cancel feature, which returns the
system to unoccupied mode.

Trane LonTalk/BACnet—. The controller is designed to send and receive data using LonTalk or
BACnet. Current unit status conditions and setpoints may be monitored and/or edited from any of
several LonTalk or BACnet compatible system-level controllers.
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Mechanical Specifications: Fan-Powered

Pneumatic Controls
Normally Open Actuator—. Pneumatic 3 - 8 psig (20 - 55 kPa) spring-range pneumatic actuator.
3011 Pneumatic Volume Regulator (PVR)—. The regulator is a thermostat reset velocity
controller, which provides consistent air delivery within 5% of cataloged flow down to 18% of unit
cataloged cfm, independent of changes in system static pressure. Factory-calibrated, fieldadjustable setpoints for minimum and maximum flows. Average total unit bleed rate, excluding
thermostat, is 28.8 scim at 20 psig (7.87 ml/min at 138 kPa) supply.
UNIT OPTIONS

Power Fuse (VPCF, VPWF)—. Optional fuse is factory-installed in the primary voltage hot leg.
HOT WATER VALVES

Two-Position Valve—. The valve is a field-adaptable, 2-way or 3-way configuration and ships
with a cap to be field-installed when configured as a 2-way valve. All connections are National Pipe
Thread (NPT).The valve body is forged brass with a hard chrome-plated brass stem. Upon demand,
the motor strokes the valve.When the actuator drive stops, a spring returns the valve to its fail-safe
position.The valves come with a manual operating lever that allows for the valve to be opened for
system flushing. It will reset to normal position the first time the valve is cycled.
Flow Capacity – 4.0 Cv
Overall Diameter – ½" NPT
Close-off Pressure – 30 psi (207 kPa)
Flow Capacity – 5.0 Cv
Overall Diameter – 3/4" NPT
Close-off Pressure – 14.5 psi (100 kPa)
Flow Capacity – 8.0 Cv
Overall Diameter – 1" NPT
Close-off Pressure – 9 psi (62 kPa)
Maximum Operating FluidTemperature – 200 deg F (95ºC)
Maximum system pressure – 300 psi (2067 kPa)
Maximum static pressure – 300 psi (2067 kPa)
Electrical Rating – 7 VA at 24 VAC, 6.5 Watts, 50/60 Hz
18" wire leads are provided on each valve.
Proportional Water Valve—The valve is a field-adaptable, 2-way or 3-way configuration and
ships with a plug in B port.This configures the valve for 2-way operation. For 3-way operation,
remove the plug.The intended fluid is water or water and glycol (50% maximum glycol).The
actuator is a synchronous motor drive.The valve is driven to a predetermined position by the UCM
controller using a proportional plus integral control algorithm. If power is removed, the valve stays
in its last position.The actuator is rated for plenum applications under UL 2043 and UL 873
standards.
Pressure andTemperature Ratings –The valve is designed and tested in full compliance with ANSI
B16.15 Class 250 pressure/temperature ratings, ANSI B16.104 Class IV control shutoff leakage, and
ISA S75.11 flow characteristic standards.
Flow Capacity – 0.70 Cv, 2.7 Cv, 6.60 Cv, 8.00 Cv
Overall Diameter – ½" NPT
Maximum Allowable Pressure – 300 psi (2068 kPa)
Maximum Operating FluidTemperature – 201ºF (94°C)
Maximum Close-off Pressure – 60 psi (0.4 MPa)
Electrical Rating – 3VA at 24 VAC
8” plenum rated cable with AMP Mate-N-Lok connector
146

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DDC Controls
Control Logic
DDC controllers are today’s industry standard. DDC controllers provide system-level data used to
optimize system performance. Variables such as occupied/unoccupied status, minimum and
maximum airflow setpoints, temperature and temperature setpoints, valve position, fan status (on
or off, and mode of operation: series or parallel), reheat status (on or off), box type and air valve
size, temperature correction offsets, flow correction values, ventilation fraction, etc. are available
on a simple twisted-shielded wire pair.
Trane DDC controllers provideTrane-designed, solid-state electronics intended specifically forVAV
temperature control in space comfort applications. DDC control capabilities include:

VAV-PRC012-EN

•

Proportional plus integral control loop algorithm for determining required airflow needed to
control room temperature. Airflow is limited by active minimum and maximum airflow
setpoints.

•

Pressure-independent (PI) operation, which automatically adjusts valve position to maintain
required airflow. In certain low-flow situations or in cases where the flow measurement has
failed, the DDC controller will operate in a pressure-dependent (PD) mode of operation.

•

Cooling and heating control action of air valve. In cooling control action, the DDC controller
matches cooling airflow to cooling load. In heating control action, the DDC controller matches
the heating airflow to control heating load.The DDC controller will automatically change over
to cooling control action if the supply air temperature is below the room temperature and will
automatically change over to heating control action if the supply air temperature is 10°F or more
above the room temperature. If the supply air temperature is between the room temperature
and the room temperature plus 10°F, then the DDC controller will provide the active minimum
airflow.The DDC controller first chooses theTracer™ SC -supplied supply air temperature value
to use for auto changeover. If this is not available, it uses the temperature provided by the
optional auxiliary temperature sensor. If this is also not available, it uses the heating/cooling
mode assigned byTracer SC or the DDC controller’s service tool (Everyware™or Rover™ V4).

•

Multiple reheat control options including staged electric, staged hot-water (normally on or
normally off), proportional hot-water, and slow pulsed width modulation. Modulating reheat
options utilize a separate reheat proportional-plus-integral control loop from that controlling
airflow into the room. Staged reheat options utilize a control algorithm based on heating
setpoint and room temperature.

•

24 VAC binary input that can be configured as a generic input or as occupancy input. When the
DDC controller is operation withTracer SC, the status of the input is provided toTracer for its
action. In stand-alone operation and when configured for an occupancy input, the input will
control occupancy status of the DDC controller.

•

Auxiliary temperature analog input that can be configured for an auxiliary temperature sensor
or a 2-to-10 VDC CO2 sensor. When sensor is mounted in the supply air duct and configured for
temperature, the value of the input is used as status-only byTracer SC ifTracer SC is providing
a supply air temperature to the DDC controller. Otherwise, the input will be used for
determining control action of the DDC controller. When configured for a CO2 sensor, the value
of the input is used as a status-only input byTracer SC.

•

Dual-duct support with two DDC controllers. One DDC controller controls the cooling air valve
and the other controller controls the heating air valve. With constant-volume sequences, the
discharge air volume is held constant by controlling discharge air volume with the heating
UCM.

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DDC Controls

Figure 6. Flow sensor signal vs. airflow delivery
5

Flow Sensor DP (In. wg)

1

4"

5"

6"

8"

10"

12" 14" 16"

0.1

0.01
10

100

1,000

10,000

Cfm

Note: Flow sensor DP (in. wg) is measured at the flow ring to aid in system balancing and commissioning. See “Valve/Controller
Airflow Guidelines” in each section for unit performance.

DDC Remote Heat Control Options
When heat is added to the primary air atVAV unit before it enters zone, the air is said to be reheated.
Operating characteristics of four basic types of VariTrane DDC terminal reheat are discussed.

Fan-Powered Terminal Units: On/Off Hot Water Reheat
Two stages of on/off hot water reheat are available.The water valves used are 2-position and are
either fully-opened or fully-closed.The heating minimum airflow setpoint is enabled during reheat.
On parallel-configured fan-powered units, the fan is energized when the space temperature falls
below the active fan on/off point (active heating setpoint plus fan offset).The parallel fan is turned
off when the space temperature rises above the active fan on/off point (active heating setpoint plus
fan offset) plus 0.5°F (0.28°C).
Series configured fan-powered terminal units utilize continuous fan operation during all occupied
settings and while unoccupied when minimum airflows are being enforced.
When the zone temperature falls below the active heating setpoint, the UCM modulates the
primary airflow to the minimum heating airflow setpoint.
Stage 1 energizes when the space temperature is below the active heating setpoint, and is deenergized when the space temperature is 0.5°F (0.28°C) above the active heating setpoint. Stage
2 energizes when the zone temperature is 1°F (0.56°C) or more below the active heating setpoint,
and de-energizes when the space temperature is 0.5°F (0.28°C) below the active heating setpoint.
When reheat is de-energized, the cooling minimum airflow setpoint is activated.

Fan-Powered Terminal Units: Proportional Hot Water Reheat
Proportional hot water reheat uses 3-wire floating-point-actuator technology.The heating
minimum airflow setpoint is enabled during reheat.
On parallel-configured fan-powered units, the fan is energized when the space temperature falls
below the active fan on/off point (active heating setpoint plus fan offset).The parallel fan is turned
off when the space temperature rises above the active fan on/off point (active heating setpoint plus
fan offset) plus 0.5°F (0.28°C).

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DDC Controls

Series-configured fan-powered terminal units utilize continuous fan operation during all occupied
settings and while unoccupied when minimum airflows are being enforced.
When the zone temperature falls below the active heating setpoint, the UCM modulates the
primary airflow to the minimum heating airflow setpoint.
The water valve opens as space temperature drops below the heating setpoint.The degree to which
the hot water valve opens is dependent on both the degree that space temperature is below the
active heating setpoint and the time that the space temperature has been below the active heating
setpoint. If not already closed, the water valve fully closes when the zone temperature rises above
the active heating setpoint by 0.5 °F (0.28 °C). When reheat is de-energized, the cooling minimum
airflow setpoint is activated.

Fan-powered Terminal Units: On/Off Electric Reheat
Two stages of staged electric reheat are available.The heating minimum airflow setpoint is enabled
during reheat.
On parallel-configured fan-powered units, the fan is energized when the space temperature falls
below the active fan on/off point (active heating setpoint plus fan offset).The parallel fan is turned
off when the space temperature rises above the active fan on/off point (active heating setpoint plus
fan offset).
Series-configured fan-powered terminal units utilize the continuous fan operation during all
occupied settings and while unoccupied when minimum airflows are being enforced.
When the zone temperature falls below the active heating setpoint, the UCM modulates the
primary airflow to the minimum heating airflow setpoint.
Stage 1 energizes when the space temperature is below the active heating setpoint, and is deenergized when the space temperature rises 0.5°F (0.28°C) above the active heating setpoint. Stage
2 energizes when the space temperature is 1.0°F (0.56°C) or more below the active heating setpoint,
and is de-energized when the space temperature is 0.5°F (0.28°C) below the active heating setpoint.
When reheat is de-energized, the cooling minimum airflow setpoint is activated.

Fan-powered Terminal Units: Pulse-Width Modulation of Electric Heat
Electric heat is modulated by energizing for a portion of a three-minute time period.The heating
minimum airflow setpoint is enabled during reheat.This allows exact load matching for energy
efficient operation, and optimum zone temperature control. One or two stages can be used.
On parallel-configured fan-powered units, the fan is energized when the space temperature falls
below the active fan on/off point (active heating setpoint plus fan offset).The parallel fan is turned
off when the space temperature rises above the active fan on/off point (active heating setpoint plus
fan offset) plus 0.5°F (0.28°C).
Series-configured fan-powered terminal units utilize the continuous fan operation during all
occupied settings and while unoccupied when minimum airflows are being enforced. When the
zone temperature falls below the active heating setpoint, the UCM modulates the primary airflow
to the minimum heating airflow setpoint.
The amount of reheat supplied is dependent on both the degree that space temperature is below
the active heating setpoint and the time that the space temperature has been below the active
heating setpoint. If not already off, reheat de-energizes when the space temperature rises 0.5°F
(0.28°C) above the active heating setpoint.The Stage 1 “on” time is proportional to the amount of
reheat required. For example, when 50% of stage 1 capacity is required, reheat is on for 90 seconds
and off for 90 seconds. When 75% of stage 1 capacity is required, reheat is on for 135 seconds and
off for 45 seconds. When 100% of stage 1 capacity is required, reheat is on continuously.
Stage 2 uses the same “on” time logic as stage 1 listed above, except stage 1 is always energized.
For example, when 75% of unit capacity is required, stage 1 is energized continuously, and stage
2 is on for 90 seconds and off for 90 seconds. When reheat is de-energized, the cooling minimum
airflow setpoint is activated. When reheat is de-energized, the cooling minimum airflow setpoint
it activated.
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DD00—Available for all VariTrane Units
(Trane actuator for field-installed DDC controls)
A unit controller is not provided.The air damper actuator is provided with an integral screw terminal block.
The fan contactor (fan-powered units), 24-VAC control power transformer (optional for single- and dual-duct
units), and factory-installed electric heater contactor wires are attached to the outside of the unit for field
connection of controls. A second actuator is provided with an integral screw terminal for dual-duct units.
CCW
24-VAC
Damper Controls
By Others

COM

M

Damper
Actuator
Load: 4 VA

CW
Y
24-VAC to
Customer
Controls

Line Voltage
BL

Transformer
24 VAC, 50 VA

2

FAN RELAY
3

Fan

1

Load: 6.5 VA
2

24-VAC Fan/Staged
Heat Controls

HEATER CONTROL BOX

1

4

C

Load: 10 VA (MAGN)

2
1st

Load: 12 VA (MERC)

3
2nd
4

3rd

5

5.

CCW
24-VAC
Damper Controls
By Others

COM

M

Damper
Actuator
Load: 4 VA

CW

NOTES:
1.

Factory-installed
Field Wiring
Optional or installed by others

2.

Located in HeaterTerminal Box for electric heat on single-duct units.
Located in Control Box for cooling only and hot water heat on single-duct units.
Located in Control Box on all fan-powered units.

3. Only available with fan-powered units.
4. Located in HeaterTerminal box.
5. Only available with dual-duct units.

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VAV-PRC012-EN

DDC Controls

Available on all VariTrane Units
FM00 – Customer-supplied actuator and DDC controller factory-installed.
FM01 –Trane actuator and customer-supplied DDC controller factory-installed
All customer furnished controllers and actuators are installed and wired per control manufacturer's specifications.
Metal control enclosure is standard.

CCW

COM

Actuator

Customer-furnished
or Trane-supplied

Fan
Relay

Trane-supplied
(Fan-powered only)

CW

24 VAC

24VAC (hot) common
BL
1st stage

Electric
Reheat
Contactors

Transformer
2nd stage
Y

Customer-furnished
Controller

Trane-supplied

3rd stage

24 VAC, 50va
Standard – (Fan-powered)
Optional – (Single-duct and Dual-duct)

LO

HI

LO

Trane-supplied

Hot Water
Reheat

Optional
Trane-supplied
water valve
field-wired
to controller.

Airflow
Sensor

NOTES:
1.

Factory-installed
Field Wiring
Optional or installed by others

2. NEMA-1 Enclosure provided.

VAV-PRC012-EN

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Tracer™ UC400 and UC210 Programmable BACnet Controllers
Introduction
TheTracer UC400 and UC210 controllers are programmable general purpose BACnet,
microprocessor-based, Direct Digital Controllers (DDC). When factory installed onTrane (Variable
Air Volume) VAV terminal units, it is factory downloaded with appropriate VAV programs and
configuration settings.Trane VAV units have been made with either pneumatic, analog electronic,
or microprocessor controls (DDC VAV).
TheTracer UC400 or UC210 controller can be configured from the factory with three different
application programs: SpaceTemperature Control (STC), Ventilation Flow Control (VFC), and Flow
Tracking Control (FTC).
TheTracer UC400 or UC210 controller programmed for STC modulates a VAV's damper blade
based on a zone temperature, measured airflow, and setpoints to continuously control conditioned
air delivery to the space.The volume of incoming air is monitored and the damper adjusts to
provide accurate control independent of the duct pressure.The damper modulates between
operator setpoints depending on space conditions. Additionally, fan and heat outputs may be
energized depending on the application.
TheTracer UC400 or UC210 controller configured forVFC can be applied to aVAV terminal and used
to temper cold outdoor air (OA) that is brought into a building for ventilation purposes.The
tempered air is intended to supply an air-handling unit (AHU), which provides comfort control to
the zones it is serving.The VAV terminal supplies the correct amount of ventilation air, and when
reheat is added, tempers the ventilation air to reduce the load on the air handler by sensing the
discharge air temperature of the VAV unit and controlling its long-term average to the discharge
air temperature setpoint.
TheTracer UC400 or UC210 controller can be configured for FTC and has two VAV units withTracer
UC400 controllers working together to provide flow tracking control. OneTracer UC400 or UC210
controller is configured from the factory with the Space temperature program and the other is
downloaded with the FTC program.The STC airflow output is bound to the flow tracking controller
airflow setpoint input.The flow tracking controller adds the configured airflow tracking offset
(positive or negative) to the airflow setpoint (communicated airflow setpoint) and controls the
airflow to this setpoint.
TheTracer UC400 or UC210 controller is BTL compliant with BACnet, an open standard building
automation protocol. It meets the Application Specific Controller (ASC) profile per ASHRAE 1352004.This allows theTracer UC400 or UC210 controller to integrate with other BACnet systems.

Available Inputs
Inputs include a twisted/shielded communication link, zone sensor, duct temperature sensors
(optional), Occupancy Sensor (optional), Discharge AirTemperature (DAT) and/or Supply Air
Temperature (SAT), CO2 sensor, and 24 VAC power. In addition to the points used for the VAV
application, the spare inputs and outputs on theTracer UC400 or UC210 controller may be used for
ancillary control, which can be programmed usingTracerTUTracer Graphical Programming 2
(TGP2).
Note: For more information on using spare points, see BAS-SVX20*-ENTracer UC400
Programmable Controller Installation, Operation, and Maintenance.

General Features and Benefits
Assured Accuracy
•

152

Proportional-plus-integral control loop algorithm for determining required airflow needed to
control room temperature. Airflow is limited by active minimum and maximum airflow
setpoints.

VAV-PRC012-EN

DDC Controls

•

Pressure-independent (PI) operation that automatically adjusts valve position to maintain
required airflow. In certain low-flow situations or in cases where the flow measurement has
failed, the DDC controller will operate in a pressure-dependent (PD) mode of operation.

•

When combined with the patentedTrane Flow ring and pressure transducer, flow is repeatable
to +/- 5% accuracy across the Pressure Independent (PI) flow range. (See Valve/Controller
Airflow Guidelines section).

•

Improved 2-Point Air Balancing is available – Assures optimized flow-sensing accuracy across
the operating range.This provides a more accurate airflow balancing method when compared
to typical single-point flow correction air balancing.

•

Analog input resolution of +/- 1/8°F within the comfort range maximizes zone temperature
control yielding excellent comfort control.

Reliable Operation
•

Built for life –Trane products are designed to stand the test of time, with a proven design life
that exceeds 20 years.

•

Fully factory tested – fully screened and configured at the factory. All features are tested
including fan and reheat stage energization, air valve modulation, and controller inputs and
outputs.

Safe Operation
•

All components, including the controller, pressure transducer, transformer, etc. are mounted
in a NEMA 1 sheet metal enclosure and are tested as an assembly to UL1995 standards.The
result is a rugged and safe VAV, controller, and thus, overall unit.

•

When in PI-mode, EH is disabled when the sensed flow is below the minimum required.

•

HW coilVAV units in ventilation flow control (VFC) have a Freeze protection algorithm to protect
the water coil and the internal space from water damage.This is accomplished by driving the
water valve to maximum position on alarm conditions.

System-Level Optimization
Trane controllers are designed to integrate intoTracer™ SC and leverage clear and clean unitcontroller related data for system level control decisions. Integrating aTrane VV550 controller into
aTracer SC Control system provides the next step in building system control.
Specifically, system-level decisions on how to operate all components can be made. Energy
efficient optimization strategies like Static Pressure Optimization, Ventilation Reset, and CO2
Demand-controlled Ventilation can be employed with the simple press of a button.The end-result
is the most efficient and reliable building control system available.

Simplified Installation
Factory Commissioned Quality – AllTrane DDC VAV controllers are factory-commissioned.This
means that the DDC boards are powered and run-tested with your specific sequence parameters.
They are connected to a communication link to make sure that information and diagnostic data
function properly. Before any VariTrane VAV unit ships they must pass a rigorous quality control
procedure.You can be assured that aTrane VAV unit withTrane DDC VAV controls will work right
out of the crate.
Zone sensor air balance – When applied to aTrane zone sensor with thumbwheel and on/cancel
buttons, a balancing contractor can drive the primary air valve to maximum or minimum airflow
from the sensor to determine the point of calibration to be used (maximum will result in optimum
performance).The flow reading can then be calibrated from the sensor, without the use of
additional service tools. (Non-LCD versions)
Tenant-Finish Heat Mode – In some office projects, the building is being constructed as tenants are
being identified.Tenant-finish heat mode is designed for applications when a given floor has not
been occupied.The main AHU system is used for heat and because the internal furnishings are not
VAV-PRC012-EN

153

DDC Controls

complete, the sensors have not been installed. In this case, the primary valve drives open using
the heat of the main AHU to keep plumbing lines from freezing. When available, the operation of
the VAV unit fan (series or parallel) remains unaffected.

Controller Flexibility
•

24 VAC binary input that can be configured as a generic input or as occupancy input. When the
DDC controller is operating withTracer™ SC, the status of the input is provided toTracer SC
for its action. In stand-alone operation and when configured for an occupancy input, the input
will control occupancy status of the DDC controller.

•

Auxiliary temperature analog input configured for an auxiliary temperature sensor.The value
of the input is used as status-only byTracer SC ifTracer SC is providing a supply air temperature
to the DDC controller. Otherwise, the input will be used for determining heating/cooling control
action of the VAV unit. When the auxiliary temperature sensor is located in the discharge of the
unit, and attached to aTraneTracer™ SC BAS, additional test sequencing and reporting is
available to maximize VAV system capabilities and simplify system commissioning.

•

Dual-duct support with two DDC controllers. One DDC controller controls the cooling air valve
and the other controller controls the heating air valve. With constant-volume sequences, the
discharge air volume is held constant by controlling discharge air volume with the heating
Controller.

•

Tracer™ UC400 Programmable BACnet Controller certified performance ensures that aTrane
VAV with controller will provide state-of-the-art, consistent open communication protocol for
integration with the industry’s latest (Non-Trane) building automation control systems,
including Johnson Control, Andover, Siemans, Honeywell, etc.

•

CO2 demand controlled ventilation enables a HVAC system to adjust ventilation flow based on
critical zone, average CO2 of specified zones, etc.Trane demand controlled ventilation
strategies are pre-defined for simplified application and can be easily customized to meet the
needs of a specific system.

Trane DDC VAV Controller Logic
Control Logic
Direct Digital Control (DDC) controllers are today’s industry standard. DDC controllers share
system-level data to optimize system performance (including changing ventilation requirements,
system static pressures, supply air temperatures, etc.). Variables available via a simple twistedshielded wire pair include occupied/unoccupied status, minimum and maximum airflow setpoints,
zone temperature and temperature setpoints, air valve position, airflow cfm, fan status (on or off),
fan operation mode (parallel or series), reheat status (on or off), VAV unit type, air valve size,
temperature correction offsets, flow correction values, ventilation fraction, etc.
With the advent ofTracer UC400 open protocol, the most reliable VAV controller is now available
for ANY system. Gone are the days of being locked into a single supplier.Trane DDC controllers
provideTrane-designed solid-state electronics intended specifically forVAV applications including:
3. SpaceTemperature Control
4. Ventilation Flow Control (100% outside air applications)
5. FlowTracking Space Pressurization Control (New feature)

154

VAV-PRC012-EN

DDC Controls

Figure 7.

Flow sensor single vs. airflow delivery
5

Flow Sensor DP (In. wg)

1

4"

5"

6"

8"

10"

12"

14" 16"

0.1

0.01
10

100

1,000

10,000

Cfm

Note: Flow sensor DP (in. wg) is measured at the flow ring to aid in system balancing and commissioning. See “Valve/Controller
Airflow Guidelines” in each section for unit performance.

Space Temperature Control
Space temperature control applications are whereTrane emerged as an industry leader in quality
and reliability.This did not occur overnight and has continued to improve as our controller and
control logic has improved over time. STC employs controller logic designed to modulate the
supply airstream and associated reheat (either local or remote) to exactly match the load
requirements of the space.
Additionally, minimum and maximum airflow and specific controller sequence requirements are
pre-programmed to ensure that appropriate ventilation standards are consistently maintained.
When connected to aTraneTracer™ SC, trend logging, remote alarming, etc. are available to fully
utilize the power and capabilities of your systems.

General Operation-Cooling
In cooling control action, the DDC controller matches primary airflow to cooling load.The DDC
controller will automatically change over to heating control action if the supply air temperature is
above a configured/editable setpoint. When the supply air temperature is less than 10 degrees
below this setpoint, the controller will automatically switch to cooling control action.The DDC
controller first chooses theTracer SC -provided supply air temperature value to use for auto
changeover. If this is not available, it uses the temperature provided by the optional auxiliary
temperature sensor (must be installed for inlet temperature monitoring). If this is also not available,
it uses the heating/cooling mode assigned byTracer Building Automation System or the DDC
controller’s service tool.

General Operation-Reheat
In heating control action, the DDC controller matches primary airflow to heating load.The DDC
controller will automatically change over to heating control action if the supply air temperature is
above a configured/editable setpoint. When the supply air temperature is less than 10 degrees
below this setpoint, the controller will automatically switch to cooling control action.The DDC
controller first chooses theTracer SC -provided supply air temperature value to use for auto
changeover. If this is not available, it uses the temperature provided by the optional auxiliary
temperature sensor (must be installed for inlet temperature monitoring). If this is also not available,
it uses the heating/cooling mode assigned byTracer SC or the DDC controller’s service tool.

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DDC Controls

When heat is added to the primary air, the air is considered reheated. Reheat can be either local
(integral to theVAV unit in the form of an electric coil or hot water coil) or remote (typically existing
wall fin radiation, convector, etc.) or any combination of local and remote.The operating
characteristics of the four basic types of VariTrane DDC terminal reheat are discussed.

Fan-Powered Terminal Units: On/Off Hot Water Reheat
One or two stages of on/off hot water reheat are available.Two position water valves complete the
HW reheat system and are either fully opened or fully closed.The heating minimum airflow
setpoint is enforced during reheat.
On parallel fan-powered units, the fan is energized upon a call for heating.The parallel fan is turned
off when the space temperature rises above the fan on/off point (active heating setpoint plus fan
offset) plus 0.5°F (0.28°C).
Series fan-powered terminal unit fans are continuously energized during occupied mode. When
unoccupied, the fan is energized upon a call for heating or cooling and de-energized when
unoccupied zone set point is satisfied.
When the zone temperature falls below the active heating setpoint, the UCM modulates the
primary airflow to the minimum heating airflow setpoint.
Stage 1 energizes when the space temperature is below the active heating setpoint, and is deenergized when the space temperature is 0.5°F (0.28°C) above the active heating setpoint. Stage
2 energizes when the zone temperature is 1°F (0.56°C) or more below the active heating setpoint,
and de-energizes when the space temperature is 0.5°F (0.28°C) below the active heating setpoint.
When reheat is de-energized, the cooling minimum airflow setpoint is activated.

Fan-Powered Terminal Units: Proportional Hot Water Reheat
Proportional hot water reheat uses 3-wire floating-point-actuator technology.The heating
minimum airflow setpoint is enforced during reheat.
On parallel fan-powered units, the fan is energized upon a call for heating.The parallel fan is turned
off when the space temperature rises above the fan on/off point (active heating setpoint plus fan
offset) plus 0.5ºF (0.28ºC).
Series fan-powered terminal unit fans are continuously energized during occupied mode. When
unoccupied, the fan is energized upon a call for heating or cooling and de-energized when
unoccupied zone setpoint is satisfied.
The water valve opens as space temperature drops below the heating setpoint. A separate reheat
proportional-plus-integral control loop from that controlling airflow into the room is enforced.The
degree to which the hot water valve opens is dependent on both the degree that the space
temperature is below the active heating setpoint and the time that the space temperature has been
below the active heating setpoint. If not already closed, the water valve fully closes when the zone
temperature rises above the active heating setpoint by 0.5 °F (0.28 °C). When reheat is deenergized, the cooling minimum airflow setpoint is activated.

Fan-powered Terminal Units: On/Off Electric Reheat
One or two stages of staged electric reheat are available.The heating minimum airflow setpoint
is enforced during reheat.
On parallel fan-powered units, the fan is energized upon a call for heating.The parallel fan is turned
off when the space temperature rises above the fan on/off point (active heating setpoint plus fan
offset) plus 0.5°F (0.28°C).
Series fan-powered terminal unit fans are continuously energized during occupied mode. When
unoccupied, the fan is energized upon a call for heating or cooling and de-energized when
unoccupied zone set point is satisfied.
Stage 1 energizes when the space temperature is below the active heating setpoint, and is deenergized when the space temperature rises 0.5°F (0.28°C) above the active heating setpoint. Stage
2 energizes when the space temperature is 1.0°F (0.56°C) or more below the active heating setpoint,
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and is de-energized when the space temperature is 0.5°F (0.28°C) below the active heating setpoint.
When reheat is de-energized, the cooling minimum airflow setpoint is activated.

Fan-powered Terminal Units: Pulse-Width Modulation of Electric Heat
One or two stages of pulse-width modulation of electric heat are available. Energizing for a portion
of a three-minute time period modulates the electric heater.This allows exact load matching for
energy efficient operation and optimum zone temperature control.The heating minimum airflow
setpoint is enforced during reheat.
On parallel fan-powered units, the fan is energized upon a call for heating.The parallel fan is turned
off when the space temperature rises above the fan on/off point (active heating setpoint plus fan
offset) plus 0.5°F (0.28°C).
Series fan-powered terminal unit fans are continuously energized during occupied mode. When
unoccupied, fan is energized upon a call for heating or cooling and de-energized when unoccupied
zone set point is satisfied.
The amount of reheat supplied is dependent on both the degree that the space temperature is
below the active heating setpoint and the time that the space temperature has been below the
active heating setpoint. If not already off, reheat de-energizes when the space temperature rises
0.5°F (0.28°C) above the active heating setpoint.The Stage 1 “on” time is proportional to the
amount of reheat required. For example, when 50% of stage 1 capacity is required, reheat is on for
90 seconds and off for 90 seconds. When 75% of stage 1 capacity is required, reheat is on for 135
seconds and off for 45 seconds. When 100% of stage 1 capacity is required, reheat is on
continuously.
Stage 2 uses the same “on” time logic as stage 1 listed above, except stage 1 is always energized.
For example, when 75% of unit capacity is required, stage 1 is energized continuously, and stage
2 is on for 90 seconds and off for 90 seconds. When reheat is de-energized, the cooling minimum
airflow setpoint is activated. When reheat is de-energized, the cooling minimum airflow setpoint
it activated.

Ventilation Control
Ventilation control enhances the usability ofTrane DDC controllers in more select applications that
require measurement of outside air (ventilation). Ventilation control is designed for use with
constant volume single-ductVAV units which modulate the primary damper and associated reheat
to maintain an average constant discharge air temperature.The reheat is modulated to provide
discharge air temperature consistent with AHU supply air temperature (typically 50º–60ºF).This is
critical to ensure that ASHRAE Standard 62 Ventilation standards are attained, consistently
maintained, and monitored. When connected to aTrane Building Automation System, trend
logging, remote alarming, etc. is available. In fact, theTraneTracer SC control system can provide
unmatched “peace of mind” by calling/paging the appropriate person(s) when specific alarms
occur.

Flow Tracking Control
This enhanced VAV DDC controller feature allows twoTrane VV550 controllers to coordinate
modulation simultaneously.This allows a specific CFM offset to be maintained.The CFM offset
provides pressurization control of an occupied space, while maintaining the comfort and energy
savings of a VAV system. A flow tracking system in a given zone consists of a standard Space
Comfort Control VAV (see B)unit plus a single-duct, cooling-only, exhaust VAV unit (see C). As the
supply VAV unit modulates the supply airflow through the air valve to maintain space comfort, the
exhaust box modulates a similar amount to maintain the required CFM differential.This is a simple,
reliable means of pressurization control, which meets the requirements of the majority of zone
pressurization control applications.Typical applications include:

VAV-PRC012-EN

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School and University laboratories

•

Industrial laboratories
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•

Hospital operating rooms

•

Hospital patient rooms

•

Research and Development facilities

•

And many more…

The CFM offset is assured and can be monitored and documented when connected to aTrane
Tracer™ SC Building Automation System. FlowTracking Control is designed to meet most
pressurization control projects. If an application calls for pressure control other than flow tracking,
contact your localTrane Sales Office for technical support.
Figure 8. How does it operate?
How Does It Operate?

Supply VAV
Exhaust

To other VAVs or
Main Control Panel

B
Primary Air
from Main
AHU

Communication link

A

C

T

Occupied Space

Tracer™ Programmable BACnet Controller — Unit Control Module
TheTracer UC400 direct digital controller Unit Control Module (DDC-UCM) is a microprocessorbased terminal unit with non-volatile memory which provides accurate airflow and room
temperature control ofTrane and non-TraneVAV air terminal units.Tracer UC400 provides a simple
open protocol to allow integration ofTrane VAV units and controls into other existing control
systems.The UCM can operate in pressure-independent or pressure-dependent mode and uses a
proportional plus integral control algorithm.
The controller monitors zone temperature setpoints, zone temperature and its rate of change and
valve airflow (via flow ring differential pressure).The controller also accepts an auxiliary duct
temperature sensor input or a supply air temperature value fromTracer SC. Staged electric heat,
pulse width modulated electric heat, proportional hot water heat or on/off hot water heat control
are provided when required.The control board operates using 24-VAC power.TheTracer UC400
is also a member of theTrane Integrated Comfort™ systems (ICS) family of products. When used
with aTraneTracer™ SC or otherTrane controllers, zone grouping and unit diagnostic information
can be obtained. Also part of ICS is the factory-commissioning of parameters specified by the
engineer (see "Factory-Installed vs. Factory-Commissioned" in the Features and Benefits section
for more details).

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Specifications
Supply Voltage
24 VAC, 50/60 Hz

Maximum VA Load
No Heat or Fan
8 VA (Board,Transducer, Zone Sensor, and Actuator)
Note: If using field-installed heat, 24 VAC transformer should be sized for additional load.

Output Ratings
Actuator Output:24 VAC at 12 VA
1st Stage Reheat:24 VAC at 12 VA
2nd Stage Reheat:24 VAC at 12 VA
3rd Stage Reheat:24 VAC at 12 VA

Binary Input
24 VAC, occupancy or generic.

Auxiliary Input
Can be configured for discharge or primary air temperature sensor.

Operating Environment
32 to 140°F, (0 to 60°C)
5% to 95% RH, Non-condensing

Storage Environment
-40 to 180°F (-40 to 82.2°C),
5% to 95%RH, Non-Condensing

Physical Dimensions
Width: 5.5" (139.7 mm)
Length: 4.5" (69.85 mm)
Height: 2.0" (44.45 mm)

Connections
1/4" (6.35 mm) Stab Connections

Communications
Tracer UC400– Space Comfort Control (SCC) profile with FTT-10 transceiver.
22 awg. unshielded level 4 communication wire.

Fan Control
Series fan: On unless unoccupied and min. flow has been released.
Parallel fan: On when zone temperature is less than heating setpoint plus fan offset. Off when zone
temperature is more than heating setpoint plus fan offset plus 0.5°F (0.28°C).

Heat Staging
Staged electric or hot water proportional or pulse-width modulation

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Trane LonMark DDC VAV Controller
Introduction
This LonMark™ certified controller uses the Space Comfort Controller (SCC) profile to exchange
information over a LonTalk™ network. Networks with LonMark certified controllers provide the
latest open protocol technology. Being LonMark certified guarantees that owners and end-users
have the capability of addingTrane products to other “open” systems and relieves owners of the
pressure and expense of being locked into a single DDC supplier.TheTrane VV550 VAV controller
with VariTrane VAV units can be applied to more than justTrane systems. When a customer buys
aTrane VAV unit withTrane DDC controller, they take advantage of:
•

Factory-commissioned quality

•

Knowing they have selected the most reliable VAV controllers in the industry

•

Trane as a single source to solve any VAV equipment, or system-related issues

•

The most educated and thorough factory service technicians in the controls industry

•

Over 150 local parts centers throughout North America that can provide what you need, when
you need it.

Don’t let your existing controls supplier lock you out of the most recognized name in VAV system
control in the industry. SpecifyTrane open-protocol systems.
What are the new features of this controller? Read on to find out more.

General Features and Benefits
Assured Accuracy
•

Proportional-plus-integral control loop algorithm for determining required airflow needed to
control room temperature. Airflow is limited by active minimum and maximum airflow
setpoints.

•

Pressure-independent (PI) operation that automatically adjusts valve position to maintain
required airflow. In certain low-flow situations or in cases where the flow measurement has
failed, the DDC controller will operate in a pressure-dependent (PD) mode of operation.

•

When combined with the patentedTrane Flow ring and pressure transducer, flow is repeatable
to +/- 5% accuracy across the Pressure Independent (PI) flow range. (See Valve/Controller
Airflow Guidelines section).

•

Improved 2-Point Air Balancing is available – Assures optimized flow-sensing accuracy across
the operating range.This provides a more accurate airflow balancing method when compared
to typical single-point flow correction air balancing.

•

Analog input resolution of +/- 1/8°F within the comfort range maximizes zone temperature
control yielding excellent comfort control.

Reliable Operation
•

Built for life –Trane products are designed to stand the test of time, with a proven design life
that exceeds 20 years.

•

Fully factory tested – fully screened and configured at the factory. All features are tested
including fan and reheat stage energization, air valve modulation, and controller inputs and
outputs.

Safe Operation
•

160

All components, including the controller, pressure transducer, transformer, etc. are mounted
in a NEMA 1 sheet metal enclosure and are tested as an assembly to UL1995 standards.The
result is a rugged and safe VAV, controller, and thus, overall unit.
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•

When in PI-mode, EH is disabled when the sensed flow is below the minimum required.

•

HW coilVAV units in ventilation flow control (VFC) have a Freeze protection algorithm to protect
the water coil and the internal space from water damage.This is accomplished by driving the
water valve to maximum position on alarm conditions.

System-Level Optimization
Trane controllers are designed to integrate intoTraneTracer Building Automation Systems and
leverage clear and clean unit-controller related data for system level control decisions. Integrating
aTrane VV550 controller into aTracer Control System provides the next step in building system
control.
Specifically, system-level decisions on how to operate all components can be made. Energy
efficient optimization strategies like Static Pressure Optimization, Ventilation Reset, and CO2
Demand-controlled Ventilation can be employed with the simple press of a button.The end-result
is the most efficient and reliable building control system available.

Simplified Installation
Factory Commissioned Quality – AllTrane DDC VAV controllers are factory-commissioned.This
means that the DDC boards are powered and run-tested with your specific sequence parameters.
They are connected to a communication link to make sure that information and diagnostic data
function properly. Before any VariTrane VAV unit ships they must pass a rigorous quality control
procedure.You can be assured that aTrane VAV unit withTrane DDC VAV controls will work right
out of the crate.
Zone sensor air balance – When applied to aTrane zone sensor with thumbwheel and on/cancel
buttons, a balancing contractor can drive the primary air valve to maximum or minimum airflow
from the sensor to determine the point of calibration to be used (maximum will result in optimum
performance).The flow reading can then be calibrated from the sensor, without the use of
additional service tools. (Non-LCD versions)
Tenant-Finish Heat Mode – In some office projects, the building is being constructed as tenants are
being identified.Tenant-finish heat mode is designed for applications when a given floor has not
been occupied.The main AHU system is used for heat and because the internal furnishings are not
complete, the sensors have not been installed. In this case, the primary valve drives open using
the heat of the main AHU to keep plumbing lines from freezing. When available, the operation of
the VAV unit fan (series or parallel) remains unaffected.

Controller Flexibility

VAV-PRC012-EN

•

24 VAC binary input that can be configured as a generic input or as occupancy input. When the
DDC controller is operating withTracer SC, the status of the input is provided toTracer for its
action. In stand-alone operation and when configured for an occupancy input, the input will
control occupancy status of the DDC controller.

•

Auxiliary temperature analog input configured for an auxiliary temperature sensor.The value
of the input is used as status-only byTracer SC ifTracer SC is providing a supply air temperature
to the DDC controller. Otherwise, the input will be used for determining heating/cooling control
action of the VAV unit. When the auxiliary temperature sensor is located in the discharge of the
unit, and attached to aTraneTracer Building Automation System, additional test sequencing
and reporting is available to maximize VAV system capabilities and simplify system
commissioning.

•

Dual-duct support with two DDC controllers. One DDC controller controls the cooling air valve
and the other controller controls the heating air valve. With constant-volume sequences, the
discharge air volume is held constant by controlling discharge air volume with the heating
Controller.

•

LonMark certified performance ensures that aTrane VAV with controller will provide state-ofthe-art, consistent open communication protocol for integration with the industry’s latest (Non-

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Trane) building automation control systems, including Johnson Control, Andover, Siemans,
Honeywell, etc.
•

CO2 demand controlled ventilation enables a HVAC system to adjust ventilation flow based on
critical zone, average CO2 of specified zones, etc.Trane demand controlled ventilation
strategies are pre-defined for simplified application and can be easily customized to meet the
needs of a specific system.

Trane DDC VAV Controller Logic
Control Logic
Direct Digital Control (DDC) controllers are today’s industry standard. DDC controllers share
system-level data to optimize system performance (including changing ventilation requirements,
system static pressures, supply air temperatures, etc.). Variables available via a simple twistedshielded wire pair include occupied/unoccupied status, minimum and maximum airflow setpoints,
zone temperature and temperature setpoints, air valve position, airflow cfm, fan status (on or off),
fan operation mode (parallel or series), reheat status (on or off), VAV unit type, air valve size,
temperature correction offsets, flow correction values, ventilation fraction, etc.
With the advent of LonMark open protocol, the most reliable VAV controller is now available for
ANY system. Gone are the days of being locked into a single supplier.Trane DDC controllers
provideTrane-designed solid-state electronics intended specifically forVAV applications including:
1. SpaceTemperature Control
2. Ventilation Flow Control (100% outside air applications)
6. FlowTracking Space Pressurization Control (New feature)
Figure 9. Flow sensor single vs. airflow delivery
5

Flow Sensor DP (In. wg)

1

4"

5"

6"

8"

10"

12" 14" 16"

0.1

0.01
10

100

1,000

10,000

Cfm

Note: Flow sensor DP (in. wg) is measured at the flow ring to aid in system balancing and commissioning. See “Valve/Controller
Airflow Guidelines” in each section for unit performance.

Space Temperature Control
Space temperature control applications are whereTrane emerged as an industry leader in quality
and reliability.This did not occur overnight and has continued to improve as our controller and
control logic has improved over time. STC employs controller logic designed to modulate the
supply airstream and associated reheat (either local or remote) to exactly match the load
requirements of the space.
Additionally, minimum and maximum airflow and specific controller sequence requirements are
pre-programmed to ensure that appropriate ventilation standards are consistently maintained.
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When connected to aTraneTracer Building Automation System, trend logging, remote alarming,
etc. are available to fully utilize the power and capabilities of your systems.

General Operation-Cooling
In cooling control action, the DDC controller matches primary airflow to cooling load.The DDC
controller will automatically change over to heating control action if the supply air temperature is
above a configured/editable setpoint. When the supply air temperature is less than 10 degrees
below this setpoint, the controller will automatically switch to cooling control action.The DDC
controller first chooses theTracer™ SC -provided supply air temperature value to use for auto
changeover. If this is not available, it uses the temperature provided by the optional auxiliary
temperature sensor (must be installed for inlet temperature monitoring). If this is also not available,
it uses the heating/cooling mode assigned byTracer SC or the DDC controller’s service tool.

General Operation-Reheat
In heating control action, the DDC controller matches primary airflow to heating load.The DDC
controller will automatically change over to heating control action if the supply air temperature is
above a configured/editable setpoint. When the supply air temperature is less than 10 degrees
below this setpoint, the controller will automatically switch to cooling control action.The DDC
controller first chooses theTracer-provided supply air temperature value to use for auto
changeover. If this is not available, it uses the temperature provided by the optional auxiliary
temperature sensor (must be installed for inlet temperature monitoring). If this is also not available,
it uses the heating/cooling mode assigned byTracer SC or the DDC controller’s service tool.
When heat is added to the primary air, the air is considered reheated. Reheat can be either local
(integral to theVAV unit in the form of an electric coil or hot water coil) or remote (typically existing
wall fin radiation, convector, etc.) or any combination of local and remote.The operating
characteristics of the four basic types of VariTrane™ DDC terminal reheat are discussed.

Fan-Powered Terminal Units: On/Off Hot Water Reheat
One or two stages of on/off hot water reheat are available.Two position water valves complete the
HW reheat system and are either fully opened or fully closed.The heating minimum airflow
setpoint is enforced during reheat.
On parallel fan-powered units, the fan is energized upon a call for heating.The parallel fan is turned
off when the space temperature rises above the fan on/off point (active heating setpoint plus fan
offset) plus 0.5°F (0.28°C).
Series fan-powered terminal unit fans are continuously energized during occupied mode. When
unoccupied, the fan is energized upon a call for heating or cooling and de-energized when
unoccupied zone set point is satisfied.
When the zone temperature falls below the active heating setpoint, the UCM modulates the
primary airflow to the minimum heating airflow setpoint.
Stage 1 energizes when the space temperature is below the active heating setpoint, and is deenergized when the space temperature is 0.5°F (0.28°C) above the active heating setpoint. Stage
2 energizes when the zone temperature is 1°F (0.56°C) or more below the active heating setpoint,
and de-energizes when the space temperature is 0.5°F (0.28°C) below the active heating setpoint.
When reheat is de-energized, the cooling minimum airflow setpoint is activated.

Fan-Powered Terminal Units: Proportional Hot Water Reheat
Proportional hot water reheat uses 3-wire floating-point-actuator technology.The heating
minimum airflow setpoint is enforced during reheat.
On parallel fan-powered units, the fan is energized upon a call for heating.The parallel fan is turned
off when the space temperature rises above the fan on/off point (active heating setpoint plus fan
offset) plus 0.5ºF (0.28ºC).

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Series fan-powered terminal unit fans are continuously energized during occupied mode. When
unoccupied, the fan is energized upon a call for heating or cooling and de-energized when
unoccupied zone setpoint is satisfied.
The water valve opens as space temperature drops below the heating setpoint. A separate reheat
proportional-plus-integral control loop from that controlling airflow into the room is enforced.The
degree to which the hot water valve opens is dependent on both the degree that the space
temperature is below the active heating setpoint and the time that the space temperature has been
below the active heating setpoint. If not already closed, the water valve fully closes when the zone
temperature rises above the active heating setpoint by 0.5 °F (0.28 °C). When reheat is deenergized, the cooling minimum airflow setpoint is activated.

Fan-powered Terminal Units: On/Off Electric Reheat
One or two stages of staged electric reheat are available.The heating minimum airflow setpoint
is enforced during reheat.
On parallel fan-powered units, the fan is energized upon a call for heating.The parallel fan is turned
off when the space temperature rises above the fan on/off point (active heating setpoint plus fan
offset) plus 0.5°F (0.28°C).
Series fan-powered terminal unit fans are continuously energized during occupied mode. When
unoccupied, the fan is energized upon a call for heating or cooling and de-energized when
unoccupied zone set point is satisfied.
Stage 1 energizes when the space temperature is below the active heating setpoint, and is deenergized when the space temperature rises 0.5°F (0.28°C) above the active heating setpoint. Stage
2 energizes when the space temperature is 1.0°F (0.56°C) or more below the active heating setpoint,
and is de-energized when the space temperature is 0.5°F (0.28°C) below the active heating setpoint.
When reheat is de-energized, the cooling minimum airflow setpoint is activated.

Fan-powered Terminal Units: Pulse-Width Modulation of Electric Heat
One or two stages of pulse-width modulation of electric heat are available. Energizing for a portion
of a three-minute time period modulates the electric heater.This allows exact load matching for
energy efficient operation and optimum zone temperature control.The heating minimum airflow
setpoint is enforced during reheat.
On parallel fan-powered units, the fan is energized upon a call for heating.The parallel fan is turned
off when the space temperature rises above the fan on/off point (active heating setpoint plus fan
offset) plus 0.5°F (0.28°C).
Series fan-powered terminal unit fans are continuously energized during occupied mode. When
unoccupied, fan is energized upon a call for heating or cooling and de-energized when unoccupied
zone set point is satisfied.
The amount of reheat supplied is dependent on both the degree that the space temperature is
below the active heating setpoint and the time that the space temperature has been below the
active heating setpoint. If not already off, reheat de-energizes when the space temperature rises
0.5°F (0.28°C) above the active heating setpoint.The Stage 1 “on” time is proportional to the
amount of reheat required. For example, when 50% of stage 1 capacity is required, reheat is on for
90 seconds and off for 90 seconds. When 75% of stage 1 capacity is required, reheat is on for 135
seconds and off for 45 seconds. When 100% of stage 1 capacity is required, reheat is on
continuously.
Stage 2 uses the same “on” time logic as stage 1 listed above, except stage 1 is always energized.
For example, when 75% of unit capacity is required, stage 1 is energized continuously, and stage
2 is on for 90 seconds and off for 90 seconds. When reheat is de-energized, the cooling minimum
airflow setpoint is activated. When reheat is de-energized, the cooling minimum airflow setpoint
it activated.

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Ventilation Control
Ventilation control enhances the usability ofTrane DDC controllers in more select applications that
require measurement of outside air (ventilation). Ventilation control is designed for use with
constant volume single-ductVAV units which modulate the primary damper and associated reheat
to maintain an average constant discharge air temperature.The reheat is modulated to provide
discharge air temperature consistent with AHU supply air temperature (typically 50º–60ºF).This is
critical to ensure that ASHRAE Standard 62 Ventilation standards are attained, consistently
maintained, and monitored. When connected to aTrane Building Automation System, trend
logging, remote alarming, etc. is available. In fact, theTraneTracer Control System can provide
unmatched “peace of mind” by calling/paging the appropriate person(s) when specific alarms
occur.

Flow Tracking Control
This enhanced VAV DDC controller feature allows twoTrane VV550 controllers to coordinate
modulation simultaneously.This allows a specific CFM offset to be maintained.The CFM offset
provides pressurization control of an occupied space, while maintaining the comfort and energy
savings of a VAV system. A flow tracking system in a given zone consists of a standard Space
Comfort Control VAV (see B)unit plus a single-duct, cooling-only, exhaust VAV unit (see C). As the
supply VAV unit modulates the supply airflow through the air valve to maintain space comfort, the
exhaust box modulates a similar amount to maintain the required CFM differential.This is a simple,
reliable means of pressurization control, which meets the requirements of the majority of zone
pressurization control applications.Typical applications include:
•

School and University laboratories

•

Industrial laboratories

•

Hospital operating rooms

•

Hospital patient rooms

•

Research and Development facilities

•

And many more…

The CFM offset is assured and can be monitored and documented when connected to aTrane
Tracer Building Automation System. FlowTracking Control is designed to meet most pressurization
control projects. If an application calls for pressure control other than flow tracking, contact your
localTrane Sales Office for technical support.
Figure 10. How does it operate?
Supply VAV
Exhaust

To other VAVs or
Main Control Panel

B
Primary Air
from Main
AHU

Communication link

A

C

T

Occupied Space

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LonMark™ Direct Digital Controller—Unit Control Module
TheTrane LonMark direct digital controller Unit Control Module (DDC-UCM)
is a microprocessor-based terminal unit with non-volatile memory which
provides accurate airflow and room temperature control ofTrane and nonTrane VAV air terminal units. LonMark provides a simple open protocol to
allow integration ofTrane VAV units and controls into other existing control
systems.The UCM can operate in pressure-independent or pressuredependent mode and uses a proportional plus integral control algorithm.

The controller monitors zone temperature setpoints, zone temperature and its rate of change and
valve airflow (via flow ring differential pressure).The controller also accepts an auxiliary duct
temperature sensor input or a supply air temperature value fromTracer™ SC. Staged electric heat,
pulse width modulated electric heat, proportional hot water heat or on/off hot water heat control
are provided when required.The control board operates using 24-VAC power.TheTrane LonMark
DDC-UCM is also a member of theTrane Integrated Comfort™ systems (ICS) family of products.
When used with aTraneTracer™ SC or otherTrane controllers, zone grouping and unit diagnostic
information can be obtained. Also part of ICS is the factory-commissioning of parameters specified
by the engineer (see "Factory-Installed vs. Factory-Commissioned" in the Features and Benefits
section for more details).
Note: Trane LonMark DDC-UCM controllers can also take advantage of factory-commissioned
quality on non-Trane systems through LonMark open protocol.

Specifications
Supply Voltage
24 VAC, 50/60 Hz

Maximum VA Load
No Heat or Fan
8 VA (Board,Transducer, Zone Sensor, and Actuator)
Note: If using field-installed heat, 24 VAC transformer should be sized for additional load.

Output Ratings
Actuator Output:24 VAC at 12 VA
1st Stage Reheat:24 VAC at 12 VA
2nd Stage Reheat:24 VAC at 12 VA
3rd Stage Reheat:24 VAC at 12 VA

Binary Input
24 VAC, occupancy or generic.

Auxiliary Input
Can be configured for discharge or primary air temperature sensor.

Operating Environment
32 to 140°F, (0 to 60°C)
5% to 95% RH, Non-condensing

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Storage Environment
-40 to 180°F (-40 to 82.2°C),
5% to 95%RH, Non-Condensing

Physical Dimensions
Width: 5.5" (139.7 mm)
Length: 4.5" (69.85 mm)
Height: 2.0" (44.45 mm)

Connections
1/4" (6.35 mm) Stab Connections

Communications
LonMark – Space Comfort Control (SCC) profile with FTT-10 transceiver.
22 awg. unshielded level 4 communication wire.

Fan Control
Series fan: On unless unoccupied and min. flow has been released.
Parallel fan: On when zone temperature is less than heating setpoint plus fan offset. Off when zone
temperature is more than heating setpoint plus fan offset plus 0.5°F (0.28°C).

Heat Staging
Staged electric or hot water proportional or pulse-width modulation
Table 136. Input listing
Input description

Input

SNVT type

Space temperature

nviSpaceTemp

SNVT_temp_p

Setpoint

nviSetpoint

SNVT_temp_p

Occupancy, schedule

nviOccSchedule

SNVT_tod_event

Occupancy, manual command

nviOccManCmd

SNVT_occupancy

Occupancy sensor

nviOccSensor

SNVT_occupancy

Application mode

nviApplicMode

SNVT_hvac_mode

Heat/cool mode input

nviHeatCool

SNVT_hvac_mode

Fan speed command

nviFanSpeedCmd

SNVT_switch

Auxiliary heat enable

nviAuxHeatEnable

SNVT_switch

Valve override

nviValveOverride

SNVT_hvac_overid

Flow override

nviFlowOverride

SNVT_hvac_overid

Emergency override

nviEmergOverride

SNVT_hvac_emerg

Source temperature

nviSourceTemp

SNVT_temp_p

Space CO2

nviSpaceCO2

SNVT_ppm

Clear alarms/diagnostics

nviRequest(a)

SNVT_obj_request

Air flow setpoint input

nviAirFlowSetpt

SNVT_flow

(a) Part of the node object

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Table 137. Output listing
Output description

Output

SNVT type

Space temperature

nvoSpaceTemp

SNVT_temp_p

Unit status, mode

nvoUnitStatus

SNVT_hvac_status

Effective setpoint

nvoEffectSetpt

SNVT_temp_p

Effective occupancy

nvoEffectOccup

SNVT_occupancy

Heat cool mode

nvoHeatCool

SNVT_hvac_mode

Setpoint

nvoSetpoint

SNVT_temp_p

Discharge air temperature

nvoDischAirTemp

SNVT_temp_p

Space CO2

nvoSpaceCO2

SNVT_ppm

Effective air flow setpoint

nvoEffectFlowSP

SNVT_flow

Air flow

nvoAirFlow

SNVT_flow

File table address

nvoFileDirectory(a)

SNVT_address

Object status

nvoStatus(a)

SNVT_obj_status

Alarm message

nvoAlarmMessage

SNVT_str_asc

(a) Part of the node object.

Table 136, p. 167 provides an input listing forTracer VV550/551 VAV controllers, and Table 137,
p. 168 provides an output listing forTracer VV550/551 VAV controllers. Table 138, p. 168 provides
the configuration properties for the controller.The content of the lists conforms to both the
LonMark SCC functional profile 8500 and the LonMark node object.
Table 138. Configuration properties
Configuration property
description

Configuration property

SNVT type

SCPT reference

Send heartbeat

nciSndHrtBt

SNVT_time_sec

SCPTmaxSendTime (49)

Occ temperature setpoints

nciSetpoints

SNVT_temp_setpt

SCPTsetPnts (60)

Minimum send time

nciMinOutTm

SNVT_time_sec

SCPTminSendTime (52)

Receive heartbeat

nciRecHrtBt

SNVT_time_sec

SCPTmaxRcvTime (48)

Location label

nciLocation

SNVT_str_asc

SCPTlocation (17)

Local bypass time

nciBypassTime

SNVT_time_min

SCPTbypassTime (34)

Manual override time

nciManualTime

SNVT_time_min

SCPTmanOverTime (35)

Space CO2 limit

nciSpaceCO2Lim

SNVT_ppm

SCPTlimitCO2 (42)

Nominal air flow

nciNomFlow

SNVT_flow

SCPTnomAirFlow (57)

Air flow measurement gain

nciFlowGain

SNVT_multiplier

SCPTsensConstVAV (67)

Minimum air flow

nciMinFlow

SNVT_flow

SCPTminFlow (54)

Maximum air flow

nciMaxFlow

SNVT_flow

SCPTmaxFlow (51)

Minimum air flow for heat

nciMinFlowHeat

SNVT_flow

SCPTminFlowHeat (55)

Maximum air flow for heat

nciMaxFlowHeat

SNVT_flow

SCPTmaxFlowHeat (37)

Minimum flow for standby

nciMinFlowStdby

SNVT_flow

SCPTminFlowStby (56)

Firmware major version

nciDevMajVer(a)

n/a

SCPTdevMajVer (165)

Firmware minor version

nciDevMinVer(a)

n/a

SCPTdevMinVer (166)

Flow offset for tracking applications

nciFlowOffset

SNVT_flow_f

SCPToffsetFlow (265)

Local heating minimum air flow

nciMinFlowUnitHt

SNVT_flow

SCPTminFlowUnitHeat (270)

Minimum flow for standby heat

nciMnFlowStbyHt

SVNT_flow

SCPTminFlowStbyHeat(263)

(a) Part of the node object.

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Direct Digital Controller—Unit Control Module
TheTrane direct digital controller Unit Control
Module (DDC-UCM) is a microprocessor-based
terminal unit with non-volatile memory which
provides accurate airflow and room temperature
control ofTrane VAV air terminal units.The UCM can
operate in a pressure-independent or a pressuredependent mode and uses a proportional plus
integral control algorithm.The controller monitors
zone temperature setpoints, zone temperature and its
rate of change and valve airflow (via flow ring
differential pressure).
The controller also accepts an auxiliary duct temperature sensor input or a supply air temperature
value fromTracer™ SC. Staged electric heat, pulse width modulated electric heat, proportional hot
water heat or on/off hot water heat control are provided when required.The control board operates
using 24-VAC power.TheTrane DDC-UCM is a member of theTrane Integrated Comfort™ systems
(ICS) family of products. When used with aTraneTracer Building Automation System or other
Trane controllers, zone grouping and unit diagnostic information can be obtained. Also part of ICS
is the factory-commissioning of parameters specified by the engineer (see "Factory-Installed vs.
Factory-Commissioned" in the Features and Benefits section for more details).

Specifications
Supply Voltage
24 VAC, 50/60 Hz

Maximum VA Load
No Heat or Fan
12 VA (Board,Transducer, Zone Sensor, and Actuator)
Note: If using field-installed heat, 24 VAC transformer should be sized for additional load.

Output Ratings
Actuator Output: 24 VAC at 12 VA
1st Stage Reheat: 24 VAC at 12 VA
2nd Stage Reheat: 24 VAC at 12 VA
3rd Stage Reheat: 24 VAC at 12 VA

Binary Input
24 VAC

Auxiliary Input
Can be configured for an optional 2–10 VDC CO2 sensor, or auxiliary temperature sensor.

Operating Environment:
32 to 140°F, (0 to 60°C)
5% to 95% RH, Non-condensing

Storage Environment
-40 to 180°F (-40 to 82.2°C),
5% to 95%RH, Non-Condensing

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Physical Dimensions
Width: 5.5" (139.7 mm)
Length: 2.8" (69.85 mm)
Height: 1.8" (44.45 mm)

Connections
1/4" (6.35 mm) Stab Connections

Communications
RS-485; Stranded wire, twisted pair, shielded, copper conductor only, 18–20 awg

Fan Control
•

Series fan: On unless unoccupied and min. flow has been released.

•

Parallel fan: On when zone temperature is less than heating setpoint plus fan offset. Off when
zone temperature is more than heating setpoint plus fan offset plus 0.5°F (0.28°C).

Heat Staging
Staged electric or hot water proportional or pulse-width modulation

Wireless Comm Interface (WCI)
WCI controller
TheTrane® Wireless Comm Interface (WCI) enables wireless
communication between system controls, unit controls, and
wireless sensors for the new generation ofTrane control
products.The WCI replaces the need for communication wire
in all system applications.
Note: See BAS-SVX40A-EN, Installation, Operation and
Maintenance, Wireless Comm for more information.

Quantity of WCIs per Network. EachTrane wireless network can have a total of 31 WCIs (30
member WCIs plus 1 coordinator WCI). Each network requires one WCI to function as network
coordinator.
Quantity of Networks per Tracer SC. ATracer SC can support up to 8 wireless networks.
Automatic Network Formation. When a WCI is connected to aTracer SC, it is auto-assigned as
the coordinator.To enable the coordinator,Tracer SC must be configured for wireless
communication.The coordinator WCI opens the network to allow all WCIs having matching
addresses to automatically join the network.
If noTracer SC is present, a centrally located WCI must be designated to act as the coordinator.You
can manually set the coordinator WCI so all WCIs having matching addresses automatically join
the network.

Wireless Zone Sensors. The WCI also communicates withTrane wireless zone sensors,
eliminating the need for analog receivers.

Wired Zone Sensors.
Systems using Wireless Comm can also use wired zone sensors.

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Dimensions
2.896 in (73.55 mm)
1.419 in (36.03 mm)
0.118 in
(3.00 mm)

3.385 in (86.0 mm)

4.677 in (118.8 mm)

0.650 in (16.50 mm)

R0.71 in
(R1.80 mm) TYP

2.480 in (63.0 mm)

0.236 in
(6.0 mm)

2.62 in (66.55 mm)

1.344 in (34.14 mm)

Specifications
Operating Temperature
-40 to 158ºF (-40 to 70ºC)

Storage temperature
-40 to 185ºF (-40 to 85°C)

Storage and operating humidity range
5% to 95% relative humidity (RH), non-condensing

Voltage
24 Vac/Vdc nominal ± 10%. If using 24 Vac, polarity must be maintained.

Receiver power consumption
<2.5 VA

Housing material
Polycarbonate/ABS (suitable for plenum mounting), UV protected, UL 94: 5 VA flammability rating

Mounting
3.2 in (83 mm) with 2 supplied mounting screws

Range
Open range: 2,500 ft (762 m) with packet error rate of 2%
Indoor:Typical range is 200 ft (61 mm); actual range is dependent on the environment. See BASSVX55 for more detail.
Note: Range values are estimated transmission distances for satisfactory operation. Actual
distance is job specific and must be determined during site evaluation. Placement of WCI
is critical to proper system operation. In most general office space installations, distance is

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not the limiting factor for proper signal quality. Signal quality is ffected by walls, barriers,
and general clutter. For more information os available at http://www.trane.com.

Output power
North America: 100 mW

Radio frequency
2.4 GHz (IEEE Std 802.15.4-2003 compliant) (2405–2480 MHz, 5 MHz spacing)

Radio channels
16

Address range
Group 0–8, Network 1–9

Mounting
Fits a standard 2 in. by 4 in. junction box (vertical mount only). Mounting holes are spaced 3.2 in.
(83 mm) apart on vertical center line. Includes mounting screws for junction box or wall anchors
for sheet-rock walls. Overall dimensions: 2.9 in. (74 mm) by 4.7 in. (119 mm)

Wireless protocol
ZigBee PRO—ZigBee Building Automation Profile, ANSI/ASHRAE Standard 135-2008 Addendum
q (BACnet™/ZigBee)

Wireless Receiver/Wireless Zone Sensor
The wireless zone sensor system eliminates the
wiring problems associated with VAV temperature
sensors. It provides the flexibility to move zone
sensors after the occupants have revised the space
floor plan layout.The zone sensor houses the space
temperature sensor, local setpoint adjustment
thumbwheel, OCCUPIED/UNOCCUPIED button,
battery life, signal strength indicators, and spread
spectrum transmitter.
The spread spectrum receiver/translator can be field or factory installed and functions as a
communication translator between spread spectrum radio communications and the VAV
communications link.

Specifications
Power Requirements
Receiver: 24 V nominal AC/DC ± 10% < 1VA
Zone Sensor: (2) AA lithium batteries

Sensor Operating Environments
32 to 122°F, (0 to 50°C); 5 to 95%RH, Non-condensing

Receiver Operating Environments
-40 to 158°F, (-40 to 70°C); 5 to 95%RH, Non-condensing

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Storage Environment—Sensor/Receiver
-40 to 185°F, (-40 to 85°C); 5 to 95%RH, Non-condensing

Mounting
Receiver: Suitable for mounting above or below ceiling grid. Requires 24V power. Factory installed
receiver comes mounted to the VAV unit with power provided by associated unit controller
transformer. Field installed option provided with associated wire harness for similar power and
communication connection.
Sensor: Mounts to a 2x4 handi-box or directly to the wall by attaching the backplate and then
snapping the sensor body into place.

Dimensions
Receiver/Translator
Enclosure:

Plastic

Height:

4.75" (120.6 mm)

Width:

2.90" (73.5 mm)

Depth:

1.08" (27.5 mm)
Sensor/Transmitter

Enclosure:

Plastic

Height:

4.78" (121.4 mm)

Width:

2.90" (73.5 mm)

Depth:

1.08" (27.5 mm)

DDC Zone Sensor
The DDC zone sensor is used in conjunction with the
Trane direct digital controller to sense the space
temperature and to allow for user adjustment of the
zone setpoint. Models with external zone setpoint
adjustments and occupied mode override
pushbuttons are available.

Specifications
Thermistor Resistance Rating
10,000 Ohms at 77°F (25°C)

Setpoint Resistance Rating
Setpoint potentiometer is calibrated to produce 500 Ohms at a setting of 70°F (21.11°C)

Electrical Connections
Terminal Block – Pressure Connections
Communications Jack – WE-616 (available for field installation)

Physical Dimensions
Width: 2.75" (69.85 mm)
Height: 4.5" (114.3 mm)
Depth: 1.0" (25.4 mm)

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CO2 Wall Sensor and Duct CO2 Sensor
Figure 11. CO2 wall sensor (L) and duct CO2 sensor (R)

The wall- and duct-mounted carbon dioxide (CO2) sensors are designed for use withTrane DDC/
UCM control systems. Installation is made simple by attachment directly to the DDC/ UCM
controller.This allows the existing communication link to be used to send CO2 data to the higherlevelTrane control system.
Wall-mounted sensors can monitor individual zones, and the duct-mounted sensor is ideal for
monitoring return air of a given unit. Long-term stability and reliability are assured with advanced
silicon based Non-Dispersive Infrared (NDIR) technology.
When connected to a building automation system with the appropriate ventilation equipment, the
Trane CO2 sensors measure and record carbon dioxide in parts-per-million (ppm) in occupied
building spaces.These carbon dioxide measurements are typically used to identify underventilated building zones and to override outdoor airflow beyond design ventilation rates if the CO2
exceeds acceptable levels.

Specifications
Measuring Range
0–2000 parts per million (ppm)
Accuracy at 77°F (25°C)
< ± (40 ppm CO2 + 3% of reading)
(Wall only)
< ± (30 ppm CO2 + 3% of reading)

Recommended calibration interval
5 years

Response Time
1 minute (0–63%)

Operating Temperature
59 to 95°F (15 to 35°C) (Wall only)
23 to 113°F (-5 to 45°C)

Storage Temperature
-4 to 158°F (-20 to 70°C)

Humidity Range
0–85% relative humidity (RH)

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Output Signal (jumper selectable)
4-20 mA, 0–20 mA,
0–10 VDC

Resolution of Analog Outputs
10 ppm CO2

Power Supply
Nominal 24 VAC

Power Consumption
<5 VA

Housing Material
ABS plastic

Dimensions
4 1/4" x 3 1/8" x 1 7/16" (Wall only)
(108 mm x 80 mm x 36 mm) (Wall only)
3 1/8" x 3 1/8" x 7 ¾"
(80 mm x 80 mm x 200 mm)

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DDC Zone Sensor with LCD
The DDC zone sensor with LCD has the look and functionality of the
standardTrane DDC zone sensor but has a LCD display.The sensor
includes setpoint adjustment, the display of the ambient temperature, a
communication jack, and occupied mode override pushbuttons. Also, it
can be configured in the field for either a Fahrenheit or Celsius display, a
continuous display of the setpoint and the offset of displayed
temperatures.

Specifications
Thermistor Resistance Rating
10,000 Ohms at 77°F (25oC)

Setpoint Resistance Rating
Setpoint potentiometer is calibrated to produce 500 Ohms at a setting of 70oF (21.11oC)

Temperature Range
Displays 40 to 99oF (5 to 35oC)
With Setpoints 50 to 90oF (10 to 32oC)

Electrical Connections
Terminal Block – Pressure Connections
Communication Jack – WE – 616
4 VA maximum power input.

Physical Dimensions
Width: 2.8" (71.12 mm)
Length: 4.5" (114.3 mm)
Height: 1.1" (27.94 mm)

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Zone Occupancy Sensor
The zone occupancy sensor is ideal for spaces with intermittent occupancy.
It is connected to theTrane DDC UCM and allows the zone to shift to
unoccupied setpoints for energy savings when movement is not detected
in the space.
The zone occupancy sensor has a multi-cell, multi-tier lens with a
maximum field of view of 360°.The maximum coverage area of the sensor
is 1200 square feet with a maximum radius of 22 feet from the sensor when
mounted at 8 feet above the floor.
Sensor ships with 30-minute time delay pre-set from the factory.Time delay and sensitivity can be
field-adjusted.

Specifications
Power Supply
24 VAC or 24 VDC, ± 10%

Maximum VA Load
0.88 VA @ 24 VAC,
0.72 VA @ 24 VDC

Isolated Relay Rating
1 A @ 24 VAC or 24 VDC

Operating Temperature
32 to 131°F (0 to 55°C)

Storage Temperature
-22 to 176°F (-30 to 80°C)

Humidity Range
0 to 95% non-condensing

Effective Coverage Area
1200 sq ft

Effective Coverage Radius
22 feet

Housing Material
ABS Plastic

Dimensions
3.3" dia. x 2.2" deep (85 mm x 56 mm). Protrudes 0.36" (9 mm) from ceiling when installed.

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Factory or Field Wired Auxiliary Temperature Sensor
The auxiliary temperature sensor is used in conjunction with theTrane DDC
controller to sense duct temperature. When the DDC controller is used with
a Building Automation System, the sensor temperature is reported as status
only. When the DDC control is used as stand alone configuration and the
sensor is placed in the supply air duct, the sensor determines the control
action of the UCM in a heat/cool changeover system.
When factory mounted, the sensor is terminated. If sensor is field mounted,
it is shipped loose and is terminated in the field.

Specifications
Sensing Element
Thermistor 10,000 Ohms @ 77°F (25°C)

Operating Environment
-4 to 221°F (-20 to 105°C), 5%-95%RH
Non-Condensing

Wiring Connection
8 ft 18 awg
Sleeving for wire leads is acyrlic #5 awg grade C rated @ 155°C

Probe Dimensions
3.4" long x 5/16" diameter
(86 mm x 7.9 mm diameter)

Mounting
In any position on duct.
Mount the sensor to the duct using
#10 x ¾" (19.05 mm) sheet metal screws.

Control Relay
The control relay is an output device used to provide on/off control of
electrical loads.The SPST relay also will isolate the electrical load from the
direct digital controller.

Specifications
Coil Rating
24 VAC, 50/60 Hz, pull in at 85%,
4 VA inrush, 3 VA sealed, Class B insulation

Contact Rating
120 VAC, 12 FLA , 60 LRA, 18A Resistive Pilot Duty – 125 VA/3A
277 VAC, 7 FLA, 42 LRA, 18A Resistive Pilot Duty – 277 VA/3A
347 VAC, 25 FLA, 50 LRA, 30A Resistive
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Two-Position Water Valve
Two-position hot water valves are used withTrane DDC/UCM controls and
analog electronic controls. Valve actuation is by a hysteresis synchronous
motor.
All valves are field-installed and convertible from three-way to two-way by
means of an included cap.

Specifications
Valve Design
Body: Brass
Cover: Aluminum
Case: Stainless Steel
Stem: Brass, Hard Chrome Plate
“O” Ring Seals: Viton
Operating Paddle: Buna N

Valve Body Ratings
UL 873 Listed File E27743
Plenum Rated CSA C22.2 No. 139
Certified, File LR85083, Class 3221 01

Temperature Limits
200°F (93.33°C) Fluid
104°F (40°C) Ambient

Maximum Operating Pressure
300 psi (2069 kPa)

Electrical Rating
Motor Voltage – 24 VAC, 50/60 Hz
Power Consumption – 7.0 VA of 24 VAC

Valve Offerings
All valves are spring returned.
1.17 Cv – ½" (12.7 mm) O.D. NPT
3.0 Cv – ¾" (19.1 mm) O.D. NPT
6.4 Cv – 1" (25.4 mm) O.D. NPT
Cv offered (Close-off Pressure):
1.1730 psi (207 kPa)
3.014.5 psi (100 kPa)
6.49 psi (62 kPa)

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Proportional Water Valve
The proportional water valve is used to provide accurate control of a hot
water heating coil to help maintain a zone temperature setpoint.The valve
is a ball design and comes in available in four different flow capacities for
proper controllability.The valves are field-adjustable for use as a two- or
three-way configuration.The valves ship in a two-way configuration with a
plug that is installed loose in the bypass port. Conversion to three-way
operation is accomplished by removing the plug from the "B" port.The valve
actuator contains a three-wire synchronous motor.

The direct digital controller uses a time-based signal to drive the motor to its proper position.When
power is removed from the valve, it remains in its last controlled position.

Specifications
Valve Design:
Ball valve construction designed for chilled/hot water or water with up to 50% glycol

Temperature Limits
32 to 201°F (0 to 94°C) Fluid
23 to 122°F (-5 to 50°C) Ambient

Rated Body Pressure
300 psi (2.06 mPa)

Maximum Actuator Close-Off Pressure
60 psi (0.4 mPa)

Electrical Rating
Motor Voltage – 24 VAC, 50/60 Hz
Power Consumption – 3.0 VA at 24 VAC

Valve Offerings
All valves are proportional control with ½" (12.7 mm) O.D. NPT connections
Cv offered:
0.7
2.7
6.6
8.0

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Differential Pressure Transducer
The differential pressure transducer is used in conjunction with theTrane
direct digital controller and analog electronic controller.The pressure
transducer measures the difference between the high-pressure and lowpressure ports of theTrane flow ring. The transducer is self-adjusting to
changes in environmental temperature and humidity.

Specifications
Input Pressure Range
0.0 to 5.0 in. wg
(Maximum input pressure 5 psig)

Operating Environment
32 to 140° F, (0 to 60°C)
5% to 95% RH, Non-Condensing

Storage Environment
-40 to 180° F, (-40 to 82.2°C)
5% to 95%RH, Non-condensing

Electrical Connections
Vin = 5.0 VDC nominal
(4.75 to 5.25 VDC acceptable)
Current Draw = 5 mA maximum
Null Voltage = 0.250 VDC ± 0.06 VDC
Span = 3.75 VDC ± 0.08 VDC
Note: Null and Span are ratiometric with Vin

Physical Dimensions
Width: 2.5" (63.5 mm)
Length: 3.0" (76.2 mm)
Height: 1.5" (38.1 mm)

Pressure Connections
1/8" (3.175 mm) barbed tubing connections

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Transformers
The transformer converts primary power supply voltages to the voltage
required by the direct digital controller and analog.The transformer also
serves to isolate the controller from other controllers which may be
connected to the same power source.

Specifications
Primary Voltage
120 VAC
208 VAC
240 VAC
277 VAC
347 VAC
480 VAC
575 VAC

Secondary Voltage
24 VAC

Power Rating
50 VA

Physical Dimensions
For all voltages:
The transformers will be no larger than the following dimensions:
Width: 2.63" (66.7 mm)
Length: 2.50" (63.5 mm)
Height: 2.30" (58.4 mm)

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Trane Actuator – 90 Second at 60 Hz Drive Time
This actuator is used with DDC controls and retrofit kits. It is available with a 3-wire floating-point
control device. It is a direct-coupled over the shaft (minimum shaft length of 2.1"), enabling it to be
mounted directly to the damper shaft without the need for connecting linkage.The actuator has an
external manual gear release to allow manual positioning of the damper when the actuator is not
powered.The actuator is Underwriters Laboratories Standard 873 and Canadian Standards
Association Class 3221 02 certified as meeting correct safety requirements and recognized industry
standards.

Specifications
Actuator Design
3-wire, 24-AC floating-point control. Non-spring return.

Actuator Housing
Housing type-NEMA 1

Rotation Range
90° clockwise or counterclockwise

Electrical Rating
Power Supply –24 VAC (20 to 30 VAC) at 50/60 Hz
Power Consumption – 1.8 VA maximum, Class 2

Electrical Connection
Box LugTerminals

Manual Override
External clutch release lever

Shaft Requirement
½" round
2.1" length

Humidity
5% to 95% RH, Non-Condensing

Temperature Rating
Ambient operating: 32 to 125°F
(0 to 52°C)
Shipping and storage: -20 to 130°F
(-29 to 66°C)

Torque
Running: 35 in.-lb (4 N-m)
Breakaway: 35 in.-lb (4 N-m) minimum
Stall: 60 in.-lb (4.5 N-m) minimum

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Belimo Actuator – 95 Second Drive Time
This actuator is used with DDC controls and retrofit kits. It is available with a 3-wire floating-point
control device. it is a direct-coupled over the shaft enabling it to be mounted directly to the damper
shaft without the need for connecting linkage. The actuator has an external manual gear release
to allow manual positioning of the damper. The actuator is UL listed and caries the CE mark.

Specifications
Actuator Design
3-wire, 24-AC floating-point control. Brushless DC motor with internal control electronics and
constant drive time.

Rotation Range
95° clockwise or counterclockwise

Electrical Rating
Power Supply –24 VAC/DC
Power Consumption – 2VA, 1.5W

Electrical Connection
Three box-type terminals for bare wire connections.

Manual Override
External clutch release lever.

Shaft Requirement
½" round
2.1" length

Humidity
5% to 95% Non-Condensing

Temperature Rating
Ambient operating: 32 to 125°F (0 to 52°C)
Shipping and storage: -20 to 130°F(-29 to 66°C)

Torque
45 in.-lb (5 N-m)

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Trane Spring Return Actuator
This actuator is used with DDC controls and is a floating-point control
device. It is direct-coupled over the shaft (minimum shaft length of 2.1"),
enabling it to be mounted directly to the damper shaft without the need for
connecting linkage.The actuator is Underwriters Laboratories Standard
60730 and Canadian Standards Association C22.2 No. 24-93 certified as
meeting correct safety requirements and recognized industry standards.

Specifications
Actuator Design
24-VAC, floating-point control. Spring return

Actuator Housing
HousingType-NEMA IP54

Rotation Range
Adjustable from 0° to 90° at 5° intervals, clockwise or counterclockwise

Electrical Rating
Power Supply – 24 VAC (19.2 to 28.8 VAC) at 50/60 Hz
Power Consumption – 4VA holding, 5VA running maximum, Class 2

Electrical Connection
6-pin female connector forTrane UCM (forTrane DDC controls)

Manual Override
Manual override key provided
Shaft requirement:
¼" to ¾" round
2.1" length

Humidity
95% RH, Non-Condensing

Temperature Rating
Ambient operating: 32 to 130°F
(0 to 54°C)
Shipping and storage: -40 to 158°F
(-40 to 70°C)

Torque
62 in.-lbs (7N-m)

VAV-PRC012-EN

185

DDC Controls

VariTrane DDC Retrofit Kit
The retrofit kit provides the system advantages ofVariTrane DDC controls to
building owners for existing systems.The kit can be applied when
converting from pneumatic or analog controlled systems to a DDC
controlled system.The kit may be used on existing single-duct units with hot
water and electric reheat (three stages), dual-duct units, and all fan-powered
units (both series and parallel) with hot water and electric reheat (two
stages).

A VariTrane DDC-UCM, an electronic differential pressure transducer, and a six-pin connector with
wiring for an actuator, make up the assembly of the retrofit kit. All are housed inside a metal
enclosure. For maximum flexibility, the kit is available with one of two actuators or without an
actuator. If a kit is ordered without an actuator, ensure the actuator used has 24VAC three-wire
floating control. Other accessories are available with the retrofit kit which include zone sensors,
flow bars (used with units without a flow sensor), power transformers, control relays, and E/P
solenoid valves.

Retrofit Kit Actuator
This actuator is available with the DDC Retrofit Kit and is a 3-terminal,
floating-point control device. It is direct-coupled over the damper shaft so
there is no need for connecting linkage.The actuator has an external manual
gear release to allow manual positioning of the damper when the actuator
is not powered. A three-foot plenum-rated cable with bare ends will be sent
separately.The actuator is listed under Underwriters Laboratories Standard
873, CSA 22.2 No. 24 certified, and CE manufactured per Quality Standard
SO9001.

Specifications
Actuator Design
on-off/floating-point

Actuator housing
HousingType-NEMA type 1
Housing Material Rating- UL 94-5V

Angle of Rotation
Max 95º, adjustable with mechanical stops

Electrical Rating
Power Supply – 24 VAC ± 20% 50/60 Hz 24 VDC ± 10%
Power Consumption – 2VA, 1.5W

Manual Override
External push button

186

VAV-PRC012-EN

DDC Controls

Humidity
5% to 95% RH, Non-Condensing

Ambient Temperature
-22 to 122°F (-30C to 50°C)

Storage Environment
-40 to 176°F (-40 to 80°C)

Torque
45 in.-lb (5N-m)

Running Time
95 sec. for 0 to 45 in-lb

Noise Rating
Less than 35 dB (A)

Weight
1.2 lbs (0.55 kg)

Silicon-Controlled Rectifier (SCR)
•

Microprocessor based burst-fire controller / SSR

•

Low-voltage control

•

Output status indicator

•

0-100% Control Range

•

Synchronized triggering output (P3)

•

20 AC Cycles Base Period

Specifications
Input Specifications

VAV-PRC012-EN

DC Control

Supply Voltage Range (VDC) (P1)

8-28

Input Current Range [mA]

20-30

Nominal Input Impedance [Ohms]

30K

PLV Range [VDC][P4]

0-10

Nominal Input Impedance [ohms][P4]

20K

Output Status Functions

LED

Initial Logic Supply On

Flash Once

Load Voltage Missing / Load Open (W/ PLV = 0V)

Flash Once Intermittenly

Load Voltage Missing / Load Open (W/ PLV > 0V)

Flash Twice Intermittently

General Specifications

Parameters

Dielectric Strength, Input/Output/Base (50/60Hz)

4000 Vrms

Minimum Insulation Resistance (@ 500 V DC)

109 Ohm

187

DDC Controls

General Specifications

Parameters

Maximum Capacitance, Input/Output

10 pF

Ambient Operating Temperature Range

-20 to 80°C

Ambient Storage Temperature Range

-40 to 125 °C

Encapsulation

Thermally conductive Epoxy

Input connector

Header Connector 3.5mm

Output Terminals

Screws and Saddle Clamps Furnished, Installed

Output Max Wire Size

Output:2 x AWG 8 (3.8mm)

Output Screws Maximum Torque

20 in lbs (2.2 Nm)

Assembly Specifications
Weight (typical)

1.38 Lb (0.628 Kg.)

Heat Transfer Material Used

Thermal Pad

Material

Steel

Finish

Nickel Plate

Torque Applied

20 in/lbs ± 10%.

Pneumatic Controls
3011 Pneumatic Volume Regulator
The pneumatic volume regulator (PVR) is a controller that provides a
consistent airflow to the space, regardless of varying inlet duct pressure
conditions, in response to a pneumatic thermostat signal.The controller
maintains minimum and maximum airflow setpoints.The 3011 PVR can be
set to control either normally open or normally-closed air valve actuators
and can be calibrated to accept either direct-acting or reverse-acting
thermostat signals. Fixed reset control of maximum and minimum airflow
setpoints is provided.

Specifications
Differential Pressure Range
0-1 in. wg (0–249 Pa)

Minimum Setpoint Range
0-1 in. wg (0–249 Pa)

Maximum Setpoint Range
0.05 in. wg (12.5 Pa) above minimum to 1 in. wg (249 Pa) above minimum

Operating Static Pressure Range
0.25 in. wg—6.0 in. wg (62.3–1494 Pa)

Reset Pressure Span
Factory-set at 5 psig (34.5 kPa)
Field-adjustable from 0 to 10 psig
(0 to 68.9 kPa)

188

VAV-PRC012-EN

DDC Controls

Reset Start Point
Field-adjustable from 0 to 10 psig
(0 to 68.9 kPa)

Main Air Pressure
15 to 30 psig (103 to 207 kPa)

Air Consumption
28.8 scim (0.472 L/m) at 20 psig (138 kPa) main air pressure

Operating Environment
40 to 120ºF (4 to 49°C)

Storage Environment
-40 to 140ºF (-40 to 60°C)

Output Sensitivity
5 psig/0.02 in. wg (34.5 kPa/5.0 Pa)

Physical Dimensions
Width: 4.5" (114.3 mm)
Length: 2.3" (58.4 mm)
Height: 3.87" (98.3 mm)
Weight: 11 oz (312 g)

3501 Pneumatic Volume Regulator
Tubing Connections:
1/4" O.D. tubing connections
The 3501 PVR can be set to control either normally open or normally-closed
air valve actuators and can be calibrated to accept either direct-acting or
reverse-acting thermostat signals. Fixed reset control of maximum and
minimum airflow setpoints is provided.The controller is used primarily in
dual-duct constant-volume applications because of its linear output
response characteristics.The controller resets the primary air velocity
linearly with a change in thermostat pressure.
This is in contrast to the 3011 PVR, which resets velocity pressure with a change in thermostat
pressure.This allows the 3501 PVR to have improved stability at low flows.

Specifications
Differential Pressure Range
0–1.0 in. wg (0–249 Pa)

Minimum Setpoint Range
0–1.0 in. wg (0–249 Pa)

Maximum Setpoint Range
Minimum to 1.0 in. wg (249 Pa)

Operating Static Pressure Range
0.25–6.0 in. wg (62.3–1494 Pa)

VAV-PRC012-EN

189

DDC Controls

Reset Pressure Span
Factory-set at 5 psig (34.5 kPa)
Field-adjustable from 0 to 7 psig
(0 to 48.3 kPa)

Reset Start Point
Factory-set at 8 psig (55.2 kPa)
Field-adjustable from 0 to 10 psig
(0 to 68.9 kPa)

Main Air Pressure
15–30 psig (103 to 207 kPa)

Air Consumption
43.2 scim (0.708 L/m) at 20 psig (138 kPa) main air pressure

Operating Environment
40 to 120ºF (4 to 49°C)

Storage Environment
-40 to 140ºF (-40 to 60°C)

Output Sensitivity
5 psig/ 0.02 in. wg (34.5 kPa/ 5.0 Pa)

Physical Dimensions
Width: 4.5" (114.3 mm)
Length: 3.87" (98.3 mm)
Height: 4.1" (104.1 mm)
Weight: 12 oz (340 g)

Pneumatic Damper Actuator
The pneumatic actuator is designed for use on VAV terminal units in HVAC
systems.The damper actuator mounts to a standard ½" diameter shaft by a
pin and cross hold arrangement, retaining clip, and non-rotation bracket.
Two model actuators are offered with spring ranges of 3–8 psi or 8–13 psi.

Specifications
Effective Area
8 sq inches (51.6 sq cm)

Normal Rotation
100 degrees

Spring Ranges
Model 3631–5000: 8-13 psi (55.2–89.6 kPa)
Model 3631–8000: 3-8 psi (20.7–55.2 kPa)
190

VAV-PRC012-EN

DDC Controls

Supply Connection
3/16" (4.8 mm) nipple for ¼" (6.4 mm) O.D. tubing

Weight
1.5 lbs (680 g)

Ambient Limits:
Operating:-20 to 120°F
(-28.889 to 48.889°C)
Shipping:-40 to 140°F (-40 to 60°C)

Reversing Relay
Tubing Connections:
1/4" O.D. tubing connections
The pneumatic reversing relay is a proportional device that reverses the
action of the input signal. It is used to change a direct-acting signal into a
reverse-acting signal or to change a reverse-acting signal into a direct-acting
signal.This relay is used to match the operating pressure range of controlled
devices (valves, pressure switches, etc.) to the output pressure range of a
controller (such as a thermostat).The output response will always remain in
1:1 proportion to the input signal, but the relay includes the capability to bias
the output signal.

Specifications
Factory Setting
Contingent upon the selected control option
Generally set for 8 psig in. = 8 psig out or 9 psig in=9 psig out (55.2 kPa in. = 55.2 kPa out or 62.1
kPa in. = 62.1 kPa out)

Bias Adjustment
+/- 15 psig (103 kPa)

Main Air Pressure
15-30 psig (103–207 kPa)

Air Consumption
18 scim (0.295 L/m) at 20 psig (138 kPa) main air pressure

Operating Environment
40 to 120ºF (4°C to 49°C)

Storage Environment
-40 to 140ºF (-40 to 60°C)

Physical Dimensions
Width: 1.5" (38.1 mm)
Length: 1.5" (38.1 mm)
Height: 2.5" (63.5 mm)
VAV-PRC012-EN

191

DDC Controls

Signal Limiter
Tubing Connections:
3/16" (4.8 mm) nipples for 1/4" (6.4 mm) polyethylene tubing
The pneumatic signal limiter is a pressure limiting type device.The output
pressure from the signal limiter is not allowed to rise above the signal
limiter’s setting. Adjustments to the output pressure setting are made via a
screw on the back side of the valve.

Specifications
Factory Setting
Maximum output = 8 psig (55.2 kPa) Adjustable from 2–12 psig (13.8–82.7 kPa)

Main Air Pressure
Nominal 20 psig (138 kPa) 22 psig
(152 kPa) maximum acceptable pressure

Air Consumption
10 scim (0.164 L/m) at 20 psig (138 kPa) main air pressure

Operating Environment
50 to 120ºF (10 to 48.89°C)

Physical Dimensions
Width:. 1.1" (27.94 mm)|
Length: 0.9" (22.86 mm)
Height: 0.9" (22.86 mm)

Tubing Connections
9/100" (2.3 mm) nipples

192

VAV-PRC012-EN

DDC Controls

PN00 – VPCF, LPCF Parallel Fan-Powered Without Reheat
(Normal Operation: Cooling Only)
Normally-Open Damper and Actuator (Reverse-Acting Thermostat)
With an increase in room temperature, the thermostat output pressure is decreased and the actuator opens to
increase primary cooling airflow to the space. With a decrease in room temperature, the opposite action occurs
until the damper is fully closed. Upon a continued decrease in zone temperature below setpoint, the parallel fan
is energized.
S
15 ) 20
)
3.4
7.9
(10
(13

Two Pipe
Remote Mounted
T-Stat
(Reverse-Acting)

Tee

Actuator

Fan
P.E.
Switch
(N.O.)
9 PSI
(62.06 kPa)

55.2
62.1

20.7

T-Stat Pressure (kPa)

Fan On

100

S
20
(137.9)

Position %

rV
Ai

Position %

100

Restrictor
Tee

Restricted Leg
One Pipe Inset

e
alv

Customer Notes:
1.

3

One Pipe
Remote Mounted
T-Stat
(Reverse-Acting)

Factory installed.
Optional or installed by others.

8 9
T-Stat Pressure (PSI)

PN00 – VPEF, LPEF Parallel Fan-Powered with Electric Heat
(Normal Operation: Cooling Only)
Normally-Open Damper and Actuator (Reverse-Acting Thermostat)
With an increase in room temperature, the thermostat output pressure is decreased and the actuator opens to increase
primary cooling airflow to the space. With a decrease in room temperature, the opposite action occurs until the damper
is fully closed. Upon a continued decrease in zone temperature below setpoint, the parallel fan is energized. If zone
temperature continues to decrease after the fan has been energized, heating stages are energized at the appropriate
pressure settings.
9 PSI
(62.06 kPa)

Fan P.E.
Switch
Electric Heater
(N.O.)
Terminal Box
Tee

Actuator

Restrictor
Tee
96.5

82.7

3rd

rV
Ai

Position %

100

e
alv

2nd

Position %

55.2
62.1
69

20.7

Fan On

1st

3

8 9 10

12

T-Stat Pressure (PSI)

VAV-PRC012-EN

Two Pipe
Remote Mounted
T-Stat
(Reverse-Acting)

Tee

T-Stat Pressure (kPa)

100

S
15 .4) 20 .9)
7
3
(13
(10

14

Stages of Heat

S
20
(137.9)

One Pipe
Remote Mounted
T-Stat
(Reverse-Acting)

Restricted Leg
One Pipe Inset

Customer Notes:
1.
Factory installed.
Optional or installed by others.

193

DDC Controls

194

VAV-PRC012-EN

DDC Controls

PN00-VSCF, LSCF series fan-powered without reheat

VAV-PRC012-EN

195

DDC Controls

PN00-VSEF, LSEF series fan-powered with electric heat

196

VAV-PRC012-EN

DDC Controls

PN00-VSWF, LSWF series fan-powered with water coils

VAV-PRC012-EN

197

DDC Controls

198

VAV-PRC012-EN

DDC Controls

PN05 – VPWF, LPWF - Fan-Powered Terminal Units

(Normal Operation: Cooling with Hot Water Reheat)
Normally-Open Damper, Actuator, and 3011 Pneumatic Volume Regulator
(Reverse-Acting Thermostat)
With an increase in room temperature, the thermostat output pressure is decreased. This signal is input to the volume regulator, which
also receives the inputs from the high- and low-pressure from the flow ring. The volume regulator outputs a signal compensated for
changing duct pressures to the valve actuator, which opens the damper and increases primary cooling flow to the space. With a
decrease in room temperature, the opposite action occurs. Minimum and maximum primary airflow settings are maintained by the
volume regulator. If the zone temperature continues to decrease after the fan has been energized, heating stages are energized at
3-8 PSI
the appropriate pressure settings.
(20.69 - 55.16 kPa)

S
20
(137.9)

Water
Valve
(N.O.)

T
Volume
Regulator

M

B

S
15 .4) 20 .9)
7
3
( 13
(10

9 PSI In

Reversing (62.06 kPa)
Relay

M

9 PSI Out
(62.06 kPa)

S

Two Pipe
Remote Mounted
T-Stat
(Reverse Acting)

Tee
Tee

Fan On
Ai

rV

100
MAX
LPS

alv
e

Wa
Va ter
lve

MAX
CFM

Fan
P.E.
Switch
(N.O.)
9 PSI
(62.06 kPa)

MIN
CFM

8 9 10

3

MIN
LPS

S
20
(137.9)

One Pipe
Remote Mounted
T-Stat
(Reverse Acting)

Restricted Leg
One Pipe Inset

Customer Notes:
1.
Factory installed.
Optional or installed by others.

15

13

Restrictor
Tee

% Flow (CFM)

100
% Flow (CFM)

89.6

55.2
62.1
69

20.7

T-Stat Branch Pressure (kPa)

103.4

S
20
(137.9)

T-Stat Branch Pressure (PSI)

PN05 – VPEF, LPEF - Fan-Powered Terminal Units

(Normal Operation: Cooling with Electric Reheat)
Normally-Open Damper, Actuator, and 3011 Pneumatic Volume Regulator
(Reverse-Acting Thermostat)

With an increase in room temperature, the thermostat output pressure is decreased. This signal is input to the volume regulator, which
also receives the inputs from the high- and low-pressure from the flow ring. The volume regulator outputs a signal compensated for
changing duct pressures to the valve actuator, which opens the damper and increases primary cooling flow to the space. With a
decrease in room temperature, the opposite action occurs. Minimum and maximum primary airflow settings are maintained by the
volume regulator. If the zone temperature continues to decrease after the fan has been energized, heating stages are energized at
the appropriate pressure settings.
9 PSI
(62.06 kPa)

Electric Heater
Terminal Box

T

Ai

rV

96.5

Restrictor
Tee
100

3rd

alv
e

MAX
LPS

2nd
MIN
CFM

1st
3

8 9 10 12 14
T-Stat Branch Pressure (PSI)

MIN
LPS

% Flow (LPS)

% Flow (CFM)

82.7

Fan On

MAX
CFM

Two Pipe
Remote Mounted
T-Stat
(Reverse Acting)

Tee

T-Stat Branch Pressure (kPa)

100

VAV-PRC012-EN

Tee

55.2
62.1
69

S
20
(137.9)

S
15 .4) 20 .9)
7
3
(13
(10

(N.O.)

Volume
Regulator

20.7

M

Fan P.E.
Switch

Stages of Heat

S
20
(137.9)

One Pipe
Remote Mounted
T-Stat
(Reverse Acting)

Restricted Leg
One Pipe Inset

Customer Notes:
Factory installed.
1.
Optional or installed by others.

199

DDC Controls

PN51 – VSCF, LSCF - Fan-Powered Terminal Units

(Normal Operation: Cooling Only - Duct Pressure Switch)
Normally-Open Damper, Actuator, and 3011 Pneumatic Volume Regulator (Reverse-Acting Thermostat)
This unit is energized by sensing inlet static pressure by the duct pressure switch. The unit fan runs continually during occupied operation.
With an increase in room temperature, the thermostat output pressure is decreased. This signal is input to the volume regulator, which
also receives the inputs from the high- and low-pressure from the flow ring. The volume regulator outputs a signal compensated for
changing duct pressures to the valve actuator which opens the damper and increases primary cooling flow to the space. With a
decrease in room temperature, the opposite action occurs. Minimum and maximum primary airflow settings are maintained by the
volume regulator.
S
15 .4) 20 .9)
7
3
0
1
(13
(

T
Volume
Regulator

M

S
20
(137.9)

Restrictor
Tee

55.2
62.1

20.7

T-Stat Branch Pressure (kPa)

Occupied
Fan On

MAX
CFM

100
MAX
LPS

Ai

rV

al

ve

MIN
CFM

MIN
LPS

S
20
(137.9)

% Flow (LPS)

100
% Flow (CFM)

Two Pipe
Remote Mounted
T-Stat
(Reverse Acting)

One Pipe
Remote Mounted
T-Stat
(Reverse Acting)

Restricted Leg
One Pipe Inset

Customer Notes:
Factory installed.
1.
Optional or installed by others.

8 9
3
T-Stat Branch Pressure (PSI)

PN51 – VSEF, LSEF - Fan-Powered Terminal Units
(Normal Operation: Cooling with Electric Reheat - Duct Pressure Main)
Normally-Open Damper, Actuator, and 3011 Pneumatic Volume Regulator (Reverse-Acting Thermostat)
This unit is energized by sensing inlet static pressure by the duct pressure switch. The unit fan runs continually during occupied operation.
With an increase in room temperature, the thermostat output pressure is decreased. This signal is input to the volume regulator, which
also receives the inputs from the high- and low-pressure from the flow ring. The volume regulator outputs a signal compensated for
changing duct pressures to the valve actuator which opens the damper and increases primary cooling flow to the space. With a
decrease in room temperature, the opposite action occurs. Minimum and maximum primary airflow settings are maintained by the
volume regulator. If the zone temperature continures to decrease after the fan has been energized, heating stages are energized at the
appropriate pressure settings.

T
M

S
15 .4) 20 .9)
7
3
0
(13
(1

Electric Heater
Terminal Box

Volume
Regulator

Two Pipe
Remote Mounted
T-Stat
(Reverse Acting)

Tee
S
20
(137.9)

96.5

82.7

69

Ai

rV

3rd

alv

MAX
LPS

e

2nd
MIN
CFM

MIN
LPS

1st

8 9 10

12

% Flow (LPS)

100

Fan On

MAX
CFM

3

14
Stages of Heat

T-Stat Branch Pressure (PSI)

200

Restrictor
Tee

Occupied

100
% Flow (CFM)

55.2
62.1

20.7

T-Stat Branch Pressure (kPa)

S
20
(137.9)

One Pipe
Remote Mounted
T-Stat
(Reverse Acting)

Restricted Leg
One Pipe Inset

Customer Notes:
1.
Factory installed.
Optional or installed by others.

VAV-PRC012-EN

DDC Controls

PN51 – VSWF, LSWF - Fan-Powered Terminal Units
(Normal Operation: Cooling with Hot Water Reheat - Duct Pressure Switch)
Normally-Open Damper, Actuator, and 3011 Pneumatic Volume Regulator
(Reverse-Acting Thermostat)
This unit is energized by sensing inlet static pressure by the duct pressure switch. The unit fan runs continually during occupied
operation. With an increase in room temperature the thermostat output pressure is decreased. This signal is input to the volume
regulator, which also receives the inputs from high- and low-pressure from the flow ring. The volume regulator outputs a signal
compensated for changing duct pressures to the valve actuator which opens the damper and increases primary cooling flow to
the space. With a decrease in room temperature, the opposite action occurs. Minimum and maximum primary airflow settings
are maintained by the volume regulator. If the zone temperature continues to decrease after the fan has been energized, heating
stages are energized at the appropriate pressure settings.
Water
Valve
(N.O.)

T

Volume
Regulator

M

B
M Reversing

Relay
S

103.4

89.6

55.2
62.1
69

20.7

T-Stat Branch Pressure (kPa)

9 PSI Out
(62.06 kPa)
Two Pipe
Remote Mounted
T-Stat
(Reverse Acting)

Tee
Restrictor
Tee

Occupied
Fan On
Ai

MAX
LPS

rV

al

W
a
Va ter
lve

ve

MIN
CFM

MIN
LPS

S
20
(137.9)

Restricted Leg
One Pipe Inset

Customer Notes:
1.
Factory installed.
Optional or installed by others.

8 9 10
13 15
T-Stat Branch Pressure (PSI)

3

One Pipe
Remote Mounted
T-Stat
(Reverse Acting)

100
% Flow (LPS)

100
% Flow (CFM)

S
15 .4) 20 .9)
7
3
(13
(10

S
15 .4) 20 .9)
7
3
(13
(10

S
20
(137.9)

MAX
CFM

9 PSI In
(62.06 kPa)

3-8 PSI
(20.69 - 55.16 kPa)

PN52 – VSEF, LSEF - Fan-Powered Terminal Units
(Normal Operation: Cooling with Electric Reheat - Duct Pressure Switch)
Normally-Open Damper, Actuator, and 3011 Pneumatic Regulator
(Reverse-Acting Thermostat)
The unit is energized into occupied status by a setting of main system air pressure to 15 psi (103 kpa). At unoccupied, the main
system air is set to 20 psi (138 kpa). The unit fan cycles on as 1st stage heat when called for by the unit t-stat. Dual setpoint
pneumatic thermostat is suggested for this option. With an increase in room temperature, the thermostat output pressure is
decreased. This signal is input to the volume regulator, which also receives the inputs from the high- and low-pressure from
the flow ring. The volume regulator outputs a signal compensated for changing duct pressures to the valve actuator, which
opens the damper and increases primary cooling flow to the space. With a decrease in room temperature, the opposite action
occurs. If the zone temperature continues to decrease after the fan has been energized, heating stages are energized at the
9 PSI
appropriate pressure settings.
(62.06 kPa)

Fan P.E.

Electric Heater
Switch-1
(N.O.)
Terminal Box
Tee

T

Volume
Regulator

M

S
15 .4) 20 .9)
7
3
(13
(10

Two Pipe
Remote Mounted
T-Stat
(Reverse Acting)

Tee
S
15 .4) 20 .9)
7
3
(13
(10

Fan P.E.
Swtich-2
(N.C.)
96.5

82.7

55.2
62.1
69

S
15 .4) 20 .9)
7
3
(13
(10

100

100
MAX
CFM

Ai

rV

3rd

alv

MAX
LPS

e

2nd
MIN
CFM

1st

3

VAV-PRC012-EN

Unoccupied
Fan On

8 9 10 12 14
T-Stat Branch Pressure (PSI)

MIN
LPS

% Flow (LPS)

% Flow (CFM)

20.7

T-Stat Branch Pressure (kPa)
Occupied
Fan On

Stages of Heat

18 PSI
(124.11 kPa)

Restrictor
Tee

S
20
(137.9)

One Pipe
Remote Mounted
T-Stat
(Reverse Acting)

Restricted Leg
One Pipe Inset

Customer Notes:
1.
Factory installed.
Optional or installed by others.

201

DDC Controls

PN52 – VSCF, LSCF - Fan-Powered Terminal Units
(Normal Operation: Cooling with Electric Reheat - Dual Pressure Main)
Normally-Open Damper, Actuator, and 3011 Pneumatic Volume Regulator
(Reverse-Acting Thermostat)
The unit is energized into occupied status by a setting of main system air pressure to 15 psi (103 kpa). At unoccupied, the main
system air is set to 20 psi (138 kpa). The unit fan cycles on as 1st stage heat when called for by the unit's thermostat. Dual
setpoint pneumatic thermostat is suggested for this option. With an increase in room temperature, the thermostat output pressure
is decreased. This signal is input to the volume regulator, which also receives the inputs from the high- and low-pressure from the
flow ring. The volume regulator outputs a signal compensated for changing duct pressures to the valve actuator which opens the
damper and increases primary cooling flow to the space. With a decrease in room temperature, the opposite action occurs. Minimum
and maximum primary airflow settings are maintained by the volume regulator.
S
15 ) 20 .9)
3.4 137
(
(10

Two Pipe
Remote Mounted
T-Stat
(Reverse Acting)

T
Volume
Regulator

M

Fan P.E.
Swtich-2
(N.C.)

Fan
P.E.
Switch-1
(N.O.)
55.2
62.1

20.7

T-Stat Branch Pressure (kPa)

100

Occupied
Fan On

MAX
CFM

Ai

rV

al

MIN
CFM

MAX
LPS

MIN
LPS

3

Restrictor
Tee

100

Unoccupied
Fan On

ve

18 PSI
(124.11 kPa)

S
15 .4) 20 .9)
7
3
(13
(10

9 PSI
(62.06 kPa)

% Flow (LPS)

S
15 ) 20 .9)
3.4 137
(
(10

% Flow (CFM)

Tee

One Pipe
Remote Mounted
T-Stat
(Reverse Acting)

Restricted Leg

S
137.9
(20)

One Pipe Inset

Customer Notes:
1.
Factory installed.
Optional or installed by others.

8 9
T-Stat Branch Pressure (PSI)

PN52 – VSWF, LSWF - Fan-Powered Terminal Units
(Normal Operation: Cooling with Electric Reheat - Dual Pressure Main)
Normally-Open Damper, Actuator, and 3011 Pneumatic Volume Regulator
(Reverse-Acting Thermostat)
The unit is energized into occupied status by a setting of main system air pressure to 15 psi (103 kpa). At unoccupied, the main
system air is set to 20 psi (138 kpa). The unit fan cycles on as 1st stage heat when called for by the unit's thermostat. Dual
setpoint pneumatic thermostat is suggested for this option. With an increase in room temperature, the thermostat output pressure
is decreased. This signal is input to the volume regulator, which also receives the inputs from the high- and low-pressure from the
flow ring. The volume regulator outputs a signal compensated for changing duct pressures to the valve actuator which opens the
damper and increases primary cooling flow to the space. With a decrease in room temperature, the opposite action occurs. If the
zone temperature continues to decrease after the fan has energized, heating stages are energized at the appropriate pressure settings.
Water
Valve
(N.O.)

T
M

S
15 ) 20 .9)
3.4 137
(
(10

Volume
Regulator

3-8 PSI
(20.69 - 55.16 kPa)

S
15 ) 20 .9)
3.4 137
(
(10

9 PSI In

B
(62.06 kPa)
M Reversing
Relay
9 PSI Out
S

Two Pipe
Remote Mounted
T-Stat
(Reverse Acting)

(62.06 kPa)

Tee
Fan P.E.
18 PSI
Swtich-2
(N.C.) (124.11 kPa)

Tee
S

89.6

103.4

55.2
62.1
69
Ai

rV

al

ve

MIN
CFM

MAX
LPS

MIN
LPS

8 9 10
13 15
T-Stat Branch Pressure (PSI)

% Flow (LPS)

MAX
CFM

3

202

Unoccupied
Fan On

Occupied
Fan On
W
a
Va ter
lve

% Flow (CFM)

100

20.7

15 ) 20 .9)
3.4 137
(
(10

T-Stat Branch Pressure (kPa)
Fan
P.E.
Switch-1
(N.O.)

9 PSI
(62.06 kPa)

S
15 .4) 20 .9)
7
3
(13
(10

Restrictor
Tee

S
20
(137.9)

One Pipe
Remote Mounted
T-Stat
(Reverse Acting)

Restricted Leg
One Pipe Inset

Customer Notes:
1.
Factory installed.
Optional or installed by others.

VAV-PRC012-EN

DDC Controls

Controls Specifications
For all VariTrane units, the unit controller continuously monitors the zone temperature and varies
the primary airflow as required to meet zone setpoints. Airflow is limited by adjustable minimum
and maximum setpoints.
Additionally, for series fan-powered units, the controller will start and run the fan continuously
during the occupied mode and intermittently during the unoccupied mode. Upon a further call for
heat, any hot water or electric heat associated with the unit is enabled.
For parallel fan-powered units, the controller energizes the fan upon a call for heat. Upon a further
call for heat, reheat is enabled.

Fan Speed Control
Variable Speed Control Switch (SCR)
The SCR speed control device is standard on all fan-powered units.The SCR adjusts the fanspeed
and provides simplified system balancing.

Direct Digital Controls (DDC)
LonMark Direct Digital Controller
Trane-designed LonMark certified controller uses the space comfort control (SCC) profile to
exchange information over a LonTalk Network. LonMark networks provide the latest open protocol
technology.

Direct Digital Controller
The microprocessor-based terminal unit controller provides accurate, pressure-independent
control through the use of a proportional integral control algorithm and direct digital control
technology.The UCM, monitors zone temperature setpoints, zone temperature, the rate of
temperature change, and valve airflow. With the addition of optional sensors, room occupancy or
supply duct air temperature can be monitored.The controller is provided in an enclosure with 7/
8" (22 mm) knockouts for remote control wiring. ATrane DDC zone sensor is required.

DDC Actuator
Trane 3-wire, 24-VAC, floating-point quarter turn control actuator with linkage release button.
Actuator has a constant drive rate independent of load, a rated torque of 35 in-lb, a 90-second drive
time, and is non-spring return.Travel is terminated by end stops at fully opened and closed
positions. An integral magnetic clutch eliminates motor stall.

DDC Actuator - Belimo
LMB24-3-TTN 3-wire, 24 VAC/DC, floating-point, quarter turn actuator with linkage release button.
Actuator has a constant drive rate independent of load, a rated torque of 45 in-lb, a 95 second drive
time, and is non-spring return.Travel is terminated by end stops at fully-opened and -closed
positions. Internal electronic control prevents motor stall when motor reaches end stops.

DDC Zone Sensor
The UCM controller measures zone temperature through a sensing element located in the zone
sensor. Other zone sensor options may include an externally-adjustable setpoint, communications
jack for use with a portable service tool, and an override button to change the individual controller
from unoccupied to occupied mode.The override button has a cancel feature that will return the
system to unoccupied. Wired zone sensors utilize a thermistor to vary the voltage output in
response to changes in the zone temperature. Wiring to the UCM controller must be 18 to 22 awg.
twisted pair wiring.The setpoint adjustment range is 50–88ºF (10–31°C) Depending upon the
features available in the model of sensor selected, the zone sensor may require from a 2-wire to
a 7-wire connection. Wireless zone sensors report the same zone information as wired zone

VAV-PRC012-EN

203

DDC Controls

sensors, but do so using radio transmitter technology. No wiring from the zone sensor to the UCM
controller is necessary.

Digital Display Zone Sensor with Liquid Crystal Display (LCD)
The direct digital zone sensor contains a sensing element which sends a signal to the UCM. A Liquid
Crystal Display (LCD) indicates setpoint, or space temperature. Sensor buttons allow setpoint
adjust, and allow space temperature readings to be turned on or off.The digital display zone sensor
also includes a communication jack, for use with a portable edit device, and an override button to
change the UCM from unoccupied to occupied.The override button has a cancel feature, which
returns the system to unoccupied mode.The digital display zone sensor requires seven wires, one
for 24-VAC power.

System Communications
The Controller UCM sends and receives data from aTracer SC or otherTrane Controller. Current
unit status and setpoints may be monitored and/or edited via this data communication feature.The
network type is a twisted wire pair shielded serial communication.
The following direct digital control features are available with VariTrane terminal units:

204

•

Controls Option – DD00:Trane actuator for field-installed DDC controllers

•

Controls Option – DD01: Cooling Only (DDC/UCM)

•

Controls Option – DD02: Cooling with Normally-Closed On/Off hot water valve (Normally-Open
outputs) (DDC/UCM)

•

Controls Option – DD03: Cooling with proportional hot water valve with optional spare On/Off
Output) (DDC/UCM)

•

Controls Option – DD04: Cooling with staged On/Off electric heat (DDC/UCM)

•

Controls Option – DD05: Cooling with pulse-width modulation electric heat (DDC/UCM)

•

Controls Option – DD07: Cooling with Normally-Open On/Off hot water valve (Normally-Closed
outputs) (DDC/UCM)

•

Controls Option – DD08: Cooling and Heating - Dual-Duct Constant Volume (DDC/UCM)

•

Controls Option – FM00: Factory installation of customer supplied actuator and DDC controls.
Controls supplier is responsible for providing factory-installation and wiring instructions.

•

Controls Option – FM01:Trane actuator with factory installation of customer supplied DDC
controls. Controls supplier is responsible for installing and wiring instructions.

•

Controls Option – ENON: Shaft only for field-installation of customer-supplied actuator and
controls.The following override commands may be received by the Unit Control Module (UCM)
from aTracer SC or otherTrane controllers.

•

Control Mode –The UCM Control Mode may be edited from occupied to unoccupied to
accommodate night setback/setup.

•

Control Action –The Control Action may be edited from cooling to heating, changing the
primary air damper to a heating source.This will accommodate a cooling/heating changeover
system.

•

Control Offset – Enabling Control Offset will increase the cooling temperature setpoint and
decrease the heating temperature setpoint by a control-offset value (Stored at limiting in the
occupied mode).

•

Drive damper fully open

•

Drive damper fully closed

•

Drive damper to maximum airflow setpoint

•

Drive damper to minimum airflow setpoint

•

Disable unit heat
VAV-PRC012-EN

DDC Controls

•

Reset-Enabling the reset function forces the controller and the flow sensor to recalibrate

•

Programmable hot water valve drive time

•

Programmable air damper drive time

The following unit setpoints reside in the UCM in nonvolatile memory.These setpoints are editable
from theTracer via the communications link.

VAV-PRC012-EN

•

Occupied cooling temperature setpoint (60–80ºF (15–26°C))

•

Occupied heating temperature setpoint (60–80ºF (15–26°C))

•

Unoccupied cooling temperature setpoint (60–100ºF (15–37°C))

•

Unoccupied heating temperature setpoint (30–100ºF (15–37°C))

•

Minimum cooling flow setpoint (0, 10–110% of unit equivalent nominal airflow)

•

Minimum heating flow setpoint (0, 10–110% of unit equivalent nominal airflow)

•

Maximum flow setpoint (0, 50–100% of unit equivalent nominal airflow)

•

Fan Control Offset –This determines at what operating point the fan in a parallel fan-powered
unit is energized.This can be specified as a function of temperature, degrees above heating
setpoint, or primary airflow (0–10°F (-17–12°C) or 0,10–100% of unit equivalent nominal airflow).

•

Heating Setpoint Offset –This determines at what point the first stage of reheat turns on.
Expressed in degrees below cooling setpoint. (Only applicable when local thumbwheel is
enabled.)

•

Zone temperature, auxiliary temperature, and zone setpoint calibration corrections (adjustable
from +/-10.0ºF (+/- -12°C)).

•

Flow measurement calibration correction (50–150%)

•

Cooling Setpoint Low Limit – Applies low limit to programmed occupied cooling setpoint or
zone sensor cooling setpoint (30–100°F (-1–37°C)).

•

Heating Setpoint High Limit – Applies high limit to programmed occupied heating setpoint or
zone sensor heating setpoint (30–100ºF (-1–37°C)).

•

RTD /Thermistor – Determines what type of zone temperature sensor will be used.

•

Occupied and Unoccupied Outside Air Requirements – Determines the percent of outdoor air
required in the zone for air quality requirements.

•

Series Fan Configuration – allows option of series fan-powered box to shut off fan and close air
valve when unit is unoccupied. Fan will operate in unoccupied mode if reheat is active.

•

Heating setpoint low limit.

•

Cooling setpoint high limit.

•

Local heating flow setpoint enable/disable and setpoint.

•

Auxiliary analog input mode select for either auxiliary temperature sensor or CO2 detector.

•

Binary input mode select for either generic or occupancy detector. In addition to the above
setpoints, the following status information can be transmitted to aTracer SC or otherTrane
controllers.

•

Active cooling temperature setpoint

•

Active heating temperature setpoint

•

Current unit primary airflow

•

Current zone temperature

•

Re-heat status (On/Off)

•

Auxiliary AirTemperature – Available only if the unit has an auxiliary temperature sensor.

205

DDC Controls

•

Failure Indicators –The UCM will indicate the following: 1)Temperature Sensor Failure; 2) Flow
Sensor Failure; and 3) Local Zone Sensor Setpoint Failure.

•

Ventilation Ratio

•

Fan Status (on/off)

•

Calibration Status (calibration/not-calibrating)

•

BIP state

•

CO2 Concentration—Available only if the unit has an auxiliary CO2 sensor.This mode and
auxiliary air temperature are mutually exclusive.

Pneumatic Controls
Normally-Open Actuator
Pneumatic 3 to 8 psig (20 to 55 kPa) spring-range pneumatic actuator.

Normally-Closed Actuator
Pneumatic 8 to 13 psig (55 to 90 kPa) spring-range pneumatic actuator.

3011 Pneumatic Volume Regulator (PVR)
The regulator is a thermostat reset velocity controller, which provides consistent air delivery within
5% of cataloged flow down to 15% of unit cataloged cfm, independent of changes in system static
pressure. Factory-calibrated, field-adjustable setpoints for minimum and maximum flows.
Average total unit bleed rate, excluding thermostat, is 28.8 scim at 20 psig (7.87 mL/min at 138 kPa)
supply.

3501 Pneumatic Volume Regulator (PVR)
The 3501 regulator is a linear-reset volume controller.This PVR is used to maintain a constant
volume of airflow from the dual-duct unit when constant volume control is used. Average total unit
bleed rate, excluding thermostat, is 43.2 scim at 20 psig (11.8 mL/min at 138 kPa) supply.

Considerations for Pneumatic Thermostat
Field-supplied and -installed based on chosen control options, a direct-acting or a reverse- acting,
one-pipe or two-pipe pneumatic room thermostat will control the available air valve, reheat and
fan switch to maintain room temperature setpoint.
The following pneumatic control options features are available with VariTrane terminal units:
•
•
•
•
•
•
•
•
•
•
•

206

PN00: Cooling with Normally-Open damper and actuator only (Reverse-ActingThermostat)
PN04: Cooling with hot water reheat, Normally-Open damper, 3011 PVR (Direct-Acting
Thermostat)
PN05: Cooling with electric reheat, Normally-Open damper, 3011 PVR (Reverse-Acting
Thermostat)
PN08: Cooling and Heating, Normally-Open dampers, actuators only (Reverse-Acting
Thermostat)
PN09: Cooling and Heating, Normally-Open dampers, 3011 PVR’s (Direct-ActingThermostat)
PN10: Cooling and Heating, Normally-Open dampers, 3501 PVR’s, Dual-Duct Constant Volume
(Direct-ActingThermostat)
PN11: Cooling with hot water reheat, Normally-Open damper, 3011 PVR - Auto Dual Minimum
(Direct-ActingThermostat) (N.O. Water Valve)
PN32: Cooling with hot water reheat, Normally-Open damper, 3011 PVR - Constant Volume
(Direct-ActingThermostat)
PN34: Cooling with electric reheat, Normally-Open damper, 3011 PVR - Constant Volume
(Reverse-ActingThermostat)
PN51: Cooling with reheat, Normally-Open damper, 3011 PVR Duct Pressure Switch (ReverseActingThermostat)
PN52: Cooling with reheat, Normally-Open damper, 3011 PVR - Dual Pressure Minimum
(Reverse-ActingThermostat)

VAV-PRC012-EN

DDC Controls

•
•
•
•

PC00: Cooling Only with Normally-Closed damper - Direct-ActingThermostat
PC03: Cooling and Heating, Normally-Closed heating damper, Normally-Open cooling damper,
actuators only - Direct-ActingThermostat
PC04: Cooling with hot water reheat, Normally-Closed damper, 3011 PVR - Direct-Acting
Thermostat
PC05: Cooling with electric reheat, Normally-Closed damper, 3011 PVR - Reverse-Acting
Thermostat

Options
Power Fuse (cooling only and hot water units, and VDDF)
An optional fuse is factory-installed in the primary voltage hot leg.

Transformer (Standard on fan-powered, optional on VCCF, VCWF, VDDF)
The 50-VA transformer is factory-wired and installed in an enclosure with 7/8" (22 mm) knockouts
to provide 24 VAC for controls.

Wireless Zone Sensor/Receiver
Factory mounted Receiver with field mounted Sensor accessory eliminates the need for the wiring
between the zone sensor and unit level controller. See specifications on Page C67XXX.

Disconnect Switch (Optional on VCCF, VCWF, VDDF)
Disengages power.

DDC Retrofit Kit (VRTO)
The kit consists of aTrane DDC Unit Control Module (UCM) VAV terminal unit controller and a
pressure transducer installed in a metal enclosure.The mechanical specifications of accessories
such as DDC zone sensors, hot water valves, and transformers are found elsewhere in this section.

Retrofit Kit Options
Flow Bar Sensor
The flow bar sensor is a multiple-point, averaging, pitot tube type flow sensor. It is intended for field
installation on terminal units that have no flow measurement device.The total and static pressure
outputs of the sensor are field-piped to the high and low inputs of the pressure transducer in the
retrofit kit.

Retrofit Kit Actuator
The electric actuator is a direct-coupled type actuator that utilizes three-wire, floating-point control.
The actuator is field-installed to the damper shaft and field-wired to the controller.
Trane Actuator – Actuator is rated at 4 VA at 24 VAC. Drive time is 90 seconds with 35 in.-lb (4 N-m).
Retrofit Actuator – Actuator is rated at 3 VA at 24 VAC. Drive time is 80 to 110 seconds for 0 to 35
in.-lb (0 to 4 N-m).

Other Options Available

VAV-PRC012-EN

•

DDC Zone Sensors

•

2-Position & Modulating Water Valves

•

ControlTransformer (Ships loose with mounting plate for 4x4 junction box)

•

AuxiliaryTemperature Sensor

•

Zone Occupancy Sensors

•

Co2 Sensors (Room- or duct-mounted)

207

Application Considerations
Variable-Air-Volume (VAV) System
RA

EA

OA

supply
fan

PA
VAV
box

cooling
coil
variablespeed drive
thermostat

SA

VAV System
No Heat
Central Cooling Only—In some systems, the central air handler provides only cooling and
ventilation during zone occupied periods.The supply air is maintained at a constant temperature
and the supply airflow is modulated to match the VAV airflow rate with the zone cooling
requirements.

Central Heat
Central Heat for Morning Warm-up—Many buildings cool down during the night.To be at a
comfortable temperature in the morning when the building is again occupied, heat must be added
to the spaces. Heat provided by the central air handler for morning warm-up is supplied at constant
air volume to the zones, prior to the time of occupancy. During the morning warm-up period, the
VAV terminal units must open to allow heated air to flow into the zones. In most instances very little
additional heat is needed once the building is occupied.
Central Occupied Heating-Changeover—Some buildings use the same air handler to provide
both occupied cooling and occupied heating.This is commonly referred to as a changeover system.
The system changes between heating and cooling depending on the need of the zones on the
system. In a changeover system, the operation of the VAV terminal units must also change over,
opening to provide heat in the heating mode and opening to provide cooling in the cooling mode.
Trane's main product in this type of application is called VariTrac™. VariTrane products can also be
used in these systems. (These types of systems are beyond the scope of this manual and are
discussed in detail in the VariTrac II Manual.

208

VAV-PRC012-EN

Application Considerations

Terminal Heat
Remote Heat—In some zones of a single-ductVAV system, perimeter heating equipment, remote
from the terminal unit, is used to add heat to the zone when the cooling load is lower than the
minimum cooling capacity of the VAV terminal unit. Heat is added directly to the zone while cool
supply air continues to enter the zone at a minimum rate for zone ventilation.
Terminal Reheat—In some zones of a single-ductVAV system, a minimum flow of cool supply air
is reheated at the terminal unit before entering the zone.Terminal reheat can be provided by
electrical resistance heaters or by hot water coils.
Parallel Fan-Powered Heat—In some zones of a single-duct VAV system, cool supply air at
minimum flow is mixed with warm plenum air before entering the zone at a constant flow rate. A
fan in the terminal unit, in parallel with the central fan, draws air from the plenum whenever the
zone requires heat.
Series Fan-Powered Heat—In some zones of a single-duct VAV system, the airflow to the zone
is held constant, during both heating and cooling, by a terminal unit fan that is in series with the
central fan.The terminal unit fan runs continuously. When the zone requires heat, cool supply air
at minimum flow is mixed with warm, return plenum air before entering the zone.

VariTrane VAV Terminal Units
The function of the VariTrane terminal unit in a VAV control zone is to vary the volumetric airflow
rate to the zone. VariTrane units are available with either microprocessor-based DDC controls or
pneumatic or analog electronic controls. Factory-installed controls are available with all types of
terminal units.
Figure 12. Parallel fan-powered unit cooling only

Figure 13. Parallel fan-powered unit with hot water coil (L) and parallel fan-powered unit with electric coil (R)

VAV-PRC012-EN

209

Application Considerations

Figure 14. Series fan-powered unit cooling only (L) and series fan-powered unit with hot water coil (R)

VAV Terminal Unit Types
Parallel Fan-Powered
Parallel fan-powered units are commonly used in VAV zones which require some degree of heat
during occupied hours—when the primary supply air is cool.The terminal unit fan is in parallel with
the central unit fan; no primary air from the central fan passes through the terminal unit fan.The
terminal unit fan draws air from the space return plenum.
When no heat is needed, the local parallel fan is off and a backdraft damper on the fan’s discharge
is closed to prevent cool air entry into the return plenum. When cool airflow to the VAV zone is at
a minimum and the zone temperature drops below setpoint, the local parallel fan is turned on and
the backdraft damper opens. A constant volume of air is delivered to the zone because the fan
delivers a constant volume of warm plenum air which is mixed with cool primary air at a minimum
flow. Remote heat or terminal reheat can provide additional local heating.

Series Fan-Powered
Series fan-powered terminal units are used commonly in VAV zones that require heat during
occupied hours, desire constant air volume delivery, and are willing to pay for the additional energy
consumption required.The terminal unit fan is in series with the central fan. Primary air from the
central fan always passes through the terminal unit fan.
The local series fan within the terminal unit operates whenever the unit is in the occupied mode.
The volume of air delivered to the VAV zone is constant, but the temperature of the delivered air
varies. As the zone requires less cooling, the primary air damper closes. As the primary air damper
closes, the air mixture supplied to the zone contains less cool air and more warm plenum air.
Remote heat or terminal reheat can provide additional local heating.
Series fan-powered terminal units are also useful in low supply air temperature systems, since the
terminal unit fan can be sized so that warm plenum air is always mixed with low temperature
supply air.This raises the supply air temperature to an acceptable distribution level and reduces
condensation potential.

Low-Height Fan-Powered
Low-height fan-powered terminal units are a slightly modified version of a fan-powered terminal
unit. As its name suggests, the low-height fan-powered unit has a shorter height dimension to
accommodate applications where ceiling space is limited.To reduce the height, shorter terminal
unit fans are integrated into the standard height series or parallel terminal unit.The result is a unit
with a maximum height of 11.0" to 11.5".
For low-height units with the smaller fan sizes (sizes 08SQ and 09SQ), a single low-profile fan is
used. Low-height units with the largest fan size (size 10SQ) use two low-profile fans. Each fan
210

VAV-PRC012-EN

Application Considerations

operates off a separate motor.The fans still remain in series or parallel with the primary system
central fan. Low acoustic levels are much more challenging in these low ceiling space applications,
due to the reduced radiated ceiling pleunum effect.
The operation of the low-height terminal unit is exactly the same as that of a series or parallel
terminal unit, as are the options for high-efficiency ECMs, insulation options, etc. As with the other
fan-powered terminal units, additional local heating can be provided by remote heat or terminal
reheat.

Parallel vs. Series
In many climates, fan-powered systems are a lower operating cost alternative than single-duct
systems.The energy inefficiencies inherent in reheating cold primary air can be eliminated with
a key design characteristic of fan-powered terminal units, plenum air heating. Heating with warmer
plenum air allows for recovery of heat from lighting and other heat sources in the building.

Comparison of Parallel and Series Models
Once it has been determined that a fan-powered system is to be specified, the designer must decide
between parallel and series configurations. Each model carries its own characteristics of delivered
airflow, energy consumption, and acoustics. For the end user, the designer might consider three
goals: a comfortable and productive tenant environment, acceptable installed cost, and low
operating costs.
Parallel and series fan-powered terminal units offer specific advantages for particular applications.
Table 139 compares the key similarities and differences between the models that the designer
should consider in performing an engineering analysis.

Typical Application of Parallel Units
Parallel intermittent fan-powered terminal units are very common in perimeter zones or buildings
where loads vary during occupied hours. Core zones, which maintain a more constant cooling
requirement, are better suited for variable airflow (single-duct) units.Typical jobs combine parallel
fan-powered units (exterior) and single-duct units (interior) to provide an efficient system with
lowest first cost. Although the overall NC of parallel systems is lower than an equivalent series
system, the intermittent fan is sometimes noticed when energized.To minimize the impact of this
NC change, an ECM (Electrically Commutated Motor) can be used which has soft-start technology.

Typical Application of Series Units
Applications requiring constant air movement or blending utilize series constant fan-powered
terminal units. Conference rooms, laboratories, and lobbies are common applications. Because the
series fan also adds to the system external static pressure, office buildings take advantage of this
design feature and down size main air handling equipment. Finally, series terminals are used in
low-temperature air systems to temper cold primary air with warm plenum air and deliver it to the
zone.

VAV-PRC012-EN

211

Application Considerations

Table 139. Parallel vs. series
Parallel

Series

Fan Operation

Intermittent operation during occupied and
unoccupied modes.

Continuous operation during the occupied modes.
Intermittent operation during unoccupied mode.

Operating Sequence

Variable-volume, constant-temperature device during
Constant-volume, variable-temperature device at all
cooling. Constant-volume, variable-temperature
times. Delivers design airflow regardless of the load.
during heating.

Fan Energization

Based on zone temperature deviation from setpoint. Interlocked with central system fan to deliver required
No interlock with central system fan required.
air to the zone in both heating and cooling modes.

Terminal Fan Operating and
Size

Fan runs during heating load. Size for design heating Fan runs continually. Fan sizing should meet the
load. Typically this is 40 to 60% of design primary
greater of design cooling or heating airflow to the
cooling airflow.
zone.

Air valve Sizing

Design cooling airflow.

Design cooling airflow.

Minimum Inlet Static Pressure Sufficient to overcome unit, heating coil, downstream
Sufficient to overcome air valve pressure loss only.
Required for Central Fan Sizing duct and diffuser pressure losses.

Acoustics

When operating under cooling loads the terminal fan
does not run, offering superior acoustic performance
similar to single-duct VAV. Under heating loads, the
fan operates intermittently. Acoustical impact can be
minimized by use of a ECM.

Produces slightly higher background sound pressure
levels in the occupied space. This sound level remains
constant and is less noticeable than intermittent fan
operation with PSC motors.

Figure 15. Parallel & series fan-powered terminal

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Low-Temperature Air
Figure 16. Low temperature air system layout

Variable
Volume
Exhaust
Fan

Heating Coil
Zone 1
Preheat
Coil

Variable Volume
Supply Fan
Series or Parallel
Fan-powered Unit

Cooling
Coil

48°

55°

Zone 2

Benefits of Low-Temperature Air
The benefits of low-temperature air systems include reduced first cost, reduced operating cost and
increased revenue potential. Since low-temperature air transports more energy per cubic foot,
smaller fans and ducts can be used. An EarthWise™ system takes that a step farther and includes
optimizing the waterside of the HVAC system as well with low flow rates through the chilled water
and condenser loops.
Since low-temperature water can transport more thermal energy per gallon, smaller pumps, pipes,
and valves can be used. Smaller HVAC equipment consumes less energy so both electrical demand
and consumption are lowered, reducing operating costs.The amount of revenue generated by a
commercial building is related to the amount and quality of rental floor space.The amount of rental
floor space is increased in a low-temperature air system, since air handlers, riser ducts, and
equipment rooms are smaller. Since smaller ducts reduce the required ceiling plenum, additional
floors may be included without increasing building height.
The concept of the EarthWise system is to deliver superior comfort and be less expensive to install
and operate.The method to do this involves both waterside optimization and airside optimization.
The waterside is optimized using techniques of low water flow through the evaporator and
condenser of the chiller as well as using chiller-tower optimization control strategies. For more
information on the waterside of the EarthWise system, contact your localTrane representative or
visit www.trane.com.
Airside savings are obtained using a combination of lower air temperature and intelligent control
strategies.The ability of the VAV unit to communicate information is vital to system coordination.

System Operation
A low-temperature air system could be done with chilled water or direct expansion equipment. A
chilled water system includes a chiller plant, VAV air handlers, and series or parallel fan-powered
VAV terminal units.The VAV air handlers use cold water, typically around 40°F (4.4°C), from the
chiller plant, to cool the supply air to 45–50°F (7.2–10°C).The volume of supply air is determined by
the airflow needs of the VAV terminal units. A direct-expansion system would include a VAV air
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Application Considerations

handler or rooftop with series or parallel fan-powered VAV terminal units.The supply air would be
cooled to 48–52°F (8.9–11.1°C).
The VAV terminal units include a parallel or series fan with the central air handler or rooftop fan.
The terminal unit fan operates continuously, mixing 45-50°F (7.2–10°C) supply air with warm
plenum air, to provide 50–55°F (10–12.8°C) cooling air to the occupied space at design conditions.
As the cooling load in the space decreases, the VAV terminal air valve closes to reduce the flow of
cold supply air and increase the flow of warm plenum air in the case of series terminal units.The
temperature of air supplied to the space rises, but the volume flow rate to the space is constant for
the series unit.

Considerations for VAV products
To achieve the maximum benefit from the low-temperature air system, severalVAV considerations
must be addressed.

Insulation
The units must be insulated to ensure that no condensation occurs on the units. How much
insulation is needed?Trane has tested its insulation with the goal of developing a thermal
resistance ratio for each type of insulation.The thermal resistance (TR) ratio can be used, along
with the properties of the insulation and the system operating conditions to determine the
necessary insulation thickness required.
In the low-temperature air system with fan-powered units, the ducts and diffusers downstream
from the terminal unit handle air that is 55°F (12.8°C) or warmer.Therefore, condensation
considerations are no different from conventional systems. Linear slot diffusers are
recommended to take advantage of the Coanda effect described in the Diffusers section later in the
catalog.
Terminal unit surfaces that are traditionally not insulated—electric and hot water reheat coils and
the primary air inlet for example—should be thoroughly field-insulated.

Leakage
When the terminal unit fan is off, the air valve will close, and not leak. Ducts upstream of the
terminal unit must also be thoroughly insulated and constructed for very low leakage.
Duct and terminal unit insulation can be internal or external. Keep in mind that internal insulation
has hidden thermal leaks at joints and seams.These areas must be located and insulated externally
to avoid condensation. External Insulation, on the other hand, allows a complete, uniform thermal
seal.

Minimum settings and IAQ
Indoor air quality is usually best when a specific quantity of outside ventilation air reaches each
building occupant. Maintaining a minimum ventilation rate is a challenge in any VAV system
because the amount of supply air that reaches a particular space decreases as the cooling load
decreases.To insure that a minimum amount of supply air reaches the space at all times, a
minimum flow setting on the terminal unit is used. In low-temperature air systems, when the space
needs heating, this minimum flow setting results in increased heating load.Therefore, it is
important to include the additional load imposed by the cold supply air when calculating heating
loads. Reheat may be required since the ventilation values are absolute requirements and not
percentage of total airflow requirements.

EarthWise or Low-Temperature Air Distribution Design Considerations with
Parallel Fan-powered Terminal Units
The parallel fan-powered unit needs to be set up to run continuously rather than intermittently.
Since it is in parallel, the airflow required by the fan is less than a comparable series unit.This
results in energy savings. Running the parallel fan continuously will take some minor control
changes. It will, however, create a better acoustical installation.
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The parallel fan should be large enough to temper the design cooling airflow at 45–50°F to 50–55°F
(7.2–10°C to 10–12.8°C). For instance, if the design cooling airflow is 1000 cfm at 55°F (472 L/s at
12.8°C), you will need 781 cfm of 48°F (368 L/s of 8.9°C) supply air and 219 cfm of 80°F (103 L/s of
26.7°C) plenum air.The parallel fan can be sized for the 219 cfm (103 L/s) rather than the total room
airflow.
The fan airflow plus the minimum primary airflow must be checked with the minimum airflow of
the diffuse
rs to insure that dumping doesn’t occur. If that is a concern, the minimum could be adjusted up or
the fan airflow could be adjusted up.
As the valve closes, the downstream static pressure will decrease because the pressure is related
to the airflow.The fan will supply more air at the valve minimum condition than at design due to
the decreased static pressure.This should be a consideration when calculating how much airflow
would occur at the minimum valve plus fan airflow condition.The new fan airflow would be found
by looking at a fan curve at the new SP point.The new SP can be calculated:

Fan Airflow + Valve Minimum
 ----------------------------------------------------------------------------------------- X SP1 = SP 2
Fan Airflow + Valve Design

Table 140, p. 215 can be used to determine what percentage of the total airflow should come from
the fan to temper the supply air, assuming 80°F (26.7°C) plenum air.
Table 140. Percentage of airflow from fan
Primary Air Temperature (deg. F (C))
Supply Air Temp.
(deg. F (C)

45 (7.2)

46 (7.8)

47 (8.3)

48 (8.8)

49 (9.4)

50 (10)

50 (0)

14%

12%

9%

6%

3%

0%

51 (10.6)

17%

15%

12%

9%

6%

3%

52 (11.1)

20%

18%

15%

13%

10%

7%

53 (11.7)

23%

21%

18%

16%

13%

10%

54 (12.2)

26%

24%

21%

19%

16%

13%

55 (12.8)

29%

26%

24%

22%

19%

17%

If anything other than 80°F (26.7°C), the following equation can be used to calculate the percentage:
SupplyTemperature =(%*primarytemperature)+(1-%)*plenum temperature

Low-Temperature Air Distribution Design Considerations with Series Fanpowered Terminal Units
The VAV terminal unit includes a fan that operates continuously.The series fan should be large
enough to insure that the mixture of cold supply air and warm plenum air is 50–55°F (10–12.8°C)
at design cooling flow conditions. In these types of systems, it is a good design practice to develop
the system based upon 55°F (12.8°C) air being provided to the space from the fan-powered terminal
unit. If a lower temperature air is used downstream of the VAV terminal unit, the system designer
will have some concerns related to condensation on diffusers and other low-pressure ductwork
accessories. For instance, if the occupied space must receive 1000 cfm of 55°F (472 L/s at 12.8°C)
air to satisfy to design cooling load, 715 cfm must be 45°F (337 L/s must be at 7.2°C) supply air and
285 cfm must be 80°F (135 L/s must be 26.7°C) plenum air.Therefore, the series fan-powered
terminal must be sized to have the air valve deliver 715 cfm (337 L/s) of supply air at design
conditions, but the fan must be sized to deliver 1000 cfm (472 L/s).
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Airside System Factors
A couple of system related factors should be noted as they apply to condensation.The first is the
advantage the colder primary air has from a humidity standpoint. As noted in the description
above, the low-temperature system operates at space relative humidity of 30–45% while a standard
system operates at space relative humidity of 50–60%.The drier zone air means that the plenum
air returning to the series terminal unit will also be drier and, therefore, less of a problem with
condensation.
The second condensation factor to note is related to systems that shut down in the evening. Many
people believe that immediately sending low-temperature primary air to these boxes that have
been off for some time will cause a shock to the system and may cause condensation problems at
startup.The solution to this has been the advent of gradual pull-down or “soft start” systems. In
this type of system, the primary air temperature is higher on initial startup (typically 55°F(12.8°C))
and then gradually reduced to the normal operating point over the next 30 to 60 minutes.

Energy Savings & System Controls
Electrically Commutated Motor

The ECM provides an additional energy-saving option
to the system designer. Some of the advantages of the
motor include high efficiency, quiet operation, short
payback, and easy installation.There are several
considerations that need to be addressed when
deciding whether to use these motors or not.The
primary benefit may be seen as increased efficiency.

Operating Hours—The added cost of an ECM can be offset more quickly in applications which
require a relatively high number of hours of operation. However, if a space does not require
extensive running time for the unit fan, then it may not be a good candidate for this type of motor
based solely on payback.Therefore, the decision about using the ECM may be based on other
benefits, depending on the needs of the customer.
Airflow Flexibility—The ECM allows a greater airflow range per fan size. If a space is going to
change uses and load components frequently, the ability to change supply airflow with the ECM
without changing units will be a benefit.
Airflow Balancing—The ability of the ECM motor to self-balance to an airflow regardless of
pressure can be an asset when trying to air balance a job.This will help eliminate additional
dampers or changes to downstream ductwork to ensure proper airflow. For more information,
please contact your localTrane sales engineer.

Fan-Pressure Optimization
WithTrane's Integrated Comfort System, the information from VAV terminal units can be used for
other energy-saving strategies. Fan-pressure optimization is the concept of reducing the supply fan
energy usage based on the position of the terminal unit dampers.
The control system allows this scenario.The system polls the VAV units for the damper position
on each unit.The supply fan is modulated until the most wide-open damper is between 85% and
95% open.The correct airflow is still being sent to the zones since the controls of the VAV units are
pressure-independent, and the fan modulates to an optimal speed and duct static pressure which
results in fan energy savings.

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Figure 17. Optimized static-pressure control

Ventilation Reset
The Ventilation Reset control strategy enables a building ventilation system to bring in an
appropriate amount of outdoor air per ASHRAE Standard 62.1. The basis for the strategy is
measuring airflow at each zone, calculating current system ventilation efficiency using the
multiple-zone system equations of the standard, and communicating a new outdoor airflow
setpoint to the air handler.
This strategy continually monitors the zone ventilation needs and system outdoor air intake flow,
minimizing the amount of ventilation air and increasing the energy efficiency of the system.This
insures that the right amount of air is brought in at all times and that proper ventilation can be
documented.Trane has integrated this control ability into the VAV controls, air-handler controls,
and building controls.
For more detailed information on these energy-saving strategies, please refer to the “Additional
References” section at the end of this chapter for appropriate material.
Figure 18. Ventilation reset

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Control Types
VAV terminal units are available with many different options.These options fall into three main
categories of controls: direct digital (DDC), pneumatic, and analog electronic. All of these control
types can be used to perform the same basic unit control functions, yet differences exist in accuracy
of performance, versatility, installed cost, operating cost, and maintenance cost.

Direct Digital Control (DDC) Systems

Direct digital control (DDC) systems became
available as advances in computer technology made
small microprocessors available and affordable.
Much of the hardware in DDC systems is similar to
analog electronic systems.The primary difference is
that DDC controllers allow system integration, remote
monitoring, and adjustment.The microprocessor is
programmed using software that gives the controller
a higher level of capability than either the pneumatic
or analog electronic options.

Benefits:
Performance—DDC controls offer PI control capability. A PI control scheme is the most accurate
and repeatable control scheme available in the VAV terminal unit industry.
Versatility—DDC controls accepts software commands to determine how its outputs will be
controlled. When a control sequence must be modified, making changes to the software
instructions is easier and quicker than changing hardware.
Operating and Maintenance Costs—DDC controls can be networked together to provide systemcontrol strategies for energy savings. Multiple controllers can be easily monitored and adjusted
from a remote location. DDC controls also have system and individual diagnostic capability.

Disadvantages:
Versatility—The communications protocol between controllers will be different from one controller
manufacturer to another.
Installed Cost—DDC controls are the most expensive of the three control types.
Operating and Maintenance Costs—Building personnel must be trained to operate and maintain
the system.

Pneumatic Control Systems
Pneumatic control systems use compressed air through simple mechanical control devices,
such as diaphragms, springs, and levers to change an output in response to a change in a
monitored variable. With VAV terminal units, the output is typically a primary airflow and the
monitored variable is zone temperature.

Benefits:
Performance—Pneumatic controls are a proven technology that is effective and has a long life
cycle.
Installed Cost—When a source of compressed air exists at the facility, pneumatics generally have
a lower installed cost than other types of controls when only a basic functionality is required.
Operating and Maintenance Costs—Pneumatics are still the most familiar control technology to
many building designers and maintenance people.
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Large Installed Base—Pneumatic systems are very common in existing buildings.This eliminates
the need to purchase the most expensive piece of equipment in a pneumatic control system—the
control air compressor. Extensions to existing pneumatic systems are generally very simple and
extremely cost-effective.

Disadvantages:
Performance—Pneumatic controls provide proportional-only control for VAV terminal unit
systems.This control scheme is less accurate than the more advanced control schemes. Improper
calibration of pneumatic controls leads to poor energy utilization.
Versatility—A central pneumatic control system, where each of the control zones can be monitored
and adjusted from a remote location, is extremely costly to configure and to modify.
Operating and Maintenance Costs—Pneumatics easily drift and require constant upkeep and
scheduled maintenance. Diagnostic capability for pneumatics is not available. A main compressor
which is not maintained and becomes contaminated with oil or water can pump those
contaminants into the compressed-air-distribution system.This may require costly cleaning of the
system and a possible replacement of system components.

DDC Controls Basic Information
DDC controls have become the industry standard for VAV terminal unit control systems. DDC
systems use electronic field devices such as a flow transducer, a primary air modulating damper,
and an electronic thermostat.These field devices report software instructions of how the outputs
are positioned in relation to the inputs to a controller.TheVariTranesystem uses a primary air valve
and flow transducer for both DDC systems and analog electronic systems. However, the DDC zone
sensor is different from the analog electronic thermostat.
DDC controls provide much flexibility and considerable diagnostic capability. DDC controllers can
be connected together to form a network of controllers. Once the controllers are networked, they
can be monitored for proper operation from a remote location. Commands and overrides can be
sent for groups of controllers at one time to make system-wide changes. Commands and overrides
can be sent to individual units to allow problem diagnosis, temporary shutdown, startup schedules
or other specialized changes. When integrated into a building management system, the operation
of the VAV terminal unit system can be modified to do such things, as coincide with occupancy
schedules and reduce energy charges.
DDC control ofVAV terminal units is a key element in providing intelligent and responsive building
management. Precision control, flexible comfort, and after hours access are all available with the
VariTrane DDC control system for VAV terminal units.
Key features of the system include:
•

An advanced unit controller

•

Flexible system design

•

User-friendly interaction

Pneumatic Controls Basic Information
Pneumatic controls modulate air pressure of a controller to maintain setpoint. For VAV systems,
there are two primary types of pneumatic controllers—the room thermostat and the pneumatic
volume regulator (PVR).

Room Thermostats
The most visible controller to the customer is the room thermostat. Pneumatic room thermostats
can be classified by two characteristics: the tubing connection(s) to the thermostat and the action
of the thermostat output in response to a change in the input.
Room thermostats are available in models that require a one-pipe or a two-pipe configuration.The
name is derived from the number of tubes that must run to the thermostat location.The difference
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is really in the construction of the thermostats.The two-pipe thermostats have a constant pressure
supply connected via an air tube to the thermostat supply air port.The supply air travels through
the thermostat’s relays, levers, diaphragm, and bleed port to produce an output.The output line
is connected to the output port of the thermostat and extends to the controlled device.The onepipe thermostat has, as its name suggests, only one air line connection.The thermostat works by
opening and closing an air bleed valve.This will either decrease or increase the pressure on the
controlled device, which is connected to the same line that runs to the thermostat.
Room thermostats also can be classified by their reaction to a change in temperature. Room
thermostats classified this way are denoted as either direct-acting or reverse-acting. Direct-acting
thermostats will increase their output pressure as the temperature the thermostat measures
increases.
Figure 19. Direct-acting thermostat response (L) and direct-acting thermostat response (R)

On the contrary, reverse-acting thermostats will decrease their output pressure as the temperature
the thermostat measures increases.

Pneumatic Volume Regulators
These controllers accept the room thermostat signal and modulate the VAV terminal unit primary
air damper.The primary air damper is controlled for an airflow setpoint that is determined by the
room thermostat.The thermostat increases the PVR’s airflow setting when the temperature in the
space is warm. On the other hand, the thermostat decreases the PVR’s airflow setting when the
temperature in the space is cold.
Currently, VariTrane offers two models of pneumatic volume regulators in its controls offering—
the 3011 regulator (used in most applications) and the 3501 model (used in dual-duct constantvolume applications).The primary difference is the 3501 PVR’s ability to change the velocity
pressure linearly with a change in thermostat pressure, which results in improved stability at low
flows. In contrast, the 3011 PVR resets the velocity pressure with a change in thermostat pressure.
Reset Control of Minimum and Maximum Flow—The 3011 PVR and 3501 use fixed reset control of
minimum and maximum flow settings.The primary benefit of fixed reset in a pneumatic volume
regulator is stable flow control without excessive damper movement.
Fixed Reset—A fixed reset controller operates over a thermostat signal change of 5 psi between
minimum and maximum flow, regardless of the differential pressure flow sensor signal.The
thermostat is usually set for a gain of 2.5; i.e. it produces a 2.5 psi output change per degree of space
temperature change.This control strategy provides stable flow control with the primary air valve
throttling between minimum and maximum flow over a 2°F space temperature change.
Example 1: Air valve with a 6" inlet, Pneumatic thermostat gain = 2.5 psi/degree:
Minimum Flow=0 cfm, 0.0 in. wg flow signal
Maximum Flow=680 cfm, 2.0 in. wg flow signal
2.0 in. wg signal range
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The damper will modulate from zero to maximum position over a 2°F temperature change.
Bleed Port to Atmosphere—Bleeding air to the atmosphere is a normal operation for a volume
regulator.The 3011 volume regulator addresses this function with a dedicated bleed port. When air
is bled through the flow sensor, the differential pressure signal from the sensor is affected. As a
result, the flow sensor signal can be radically altered if the volume regulator is bleeding air, and
may cause excessive damper movement.
Calibration—The minimum and maximum settings are independent of each other and need to be
set only once during calibration.
Signal Configuration Flexibility—Both can be configured to work with both normally-open and
normally-closed pneumatic air valves, and both direct-acting and reverse-acting thermostats.
Pneumatic Volume Regulators
Figure 20.

Flow Measurement and Control

One of the most important characteristics of a VAV terminal unit is
its ability to accurately sense and control airflow.The VariTrane
terminal unit was developed with exactly that goal in mind.The
patented, multiple-point, averaging flow ring measures the
velocity of the air at the unit primary air inlet.

The differential pressure signal output of the flow ring provides the terminal unit controller a
measurement of the primary airflow through the inlet.The terminal unit controller then opens or
closes the inlet damper to maintain the controller airflow setpoint

Flow Measurement
Most VAV terminal units contain a differential pressure airflow measurement device, mounted at
the primary air inlet, to provide a signal to the terminal unit controller. Numerous names exist for
the differential pressure measurement device—flow sensor, flow bar, flow ring.The differential
pressure measured at the inlet varies according to the volumetric flow rate of primary air entering
the inlet.
The total pressure and the static pressure are measurable quantities.The flow measurement
device in a VAV terminal unit is designed to measure velocity pressure. Most flow sensors consist
of a hollow piece of tubing with orifices in it.The VariTrane air valve contains a flow ring as its flow
measuring device.The flow ring is two round coils of tubing. Evenly spaced orifices in the upstream
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coil are the high-pressure taps that average the total pressure of air flowing through the air valve.
The orifices in the downstream ring are low-pressure taps that average the air pressure in the wake
of flow around the tube. By definition, the measurement of static pressure is to occur at a point
perpendicular to the airflow.The low-pressure taps on the VariTrane flow ring measure a pressure
that is parallel to the direction of flow but in the opposite direction of the flow.This “wake pressure”
that the downstream ring measures is lower than the actual duct static pressure.The difference
between the “wake pressure” and the static pressure can be accounted for so that the above
relationship between flow and differential pressure remain valid.The difference also helps create
a larger pressure differential than the velocity pressure. Since the pressures being measured inVAV
terminal box applications are small, this larger differential allows transducers and controllers to
measure and control at lower flow settings than would otherwise be possible.
The average velocity of air traveling through the inlet is expressed in the equation:
VP
FPM = 1096.5 --------------DENS

Where:
FPM =

Velocity of air in feet per minute

1096.5 =

A constant

VP =

The velocity pressure of the air expressed in inches of water

DENS =

The density of the air expressed in pounds per cubic foot

Often, the density is assumed to be a constant for dry air at standard conditions (68°F (20°C)) and
sea level pressure of 14.7 psi (101.4 kPa)).These conditions yield the following commonly used
equation:
FPM = 4005 VP

The velocity pressure is defined as the difference between the total pressure in the duct and the
static pressure in the duct:
VP =TP - SP (All units are expressed in inches of water)
The amount of air traveling through the inlet is related to the area of the inlet and the velocity of
the air:
AIRFLOW = AREA (square feet) x AVERAGE VELOCITY (feet per minute)

Accuracy
The multiple, evenly spaced orifices in the flow ring of the VariTrane terminal unit provide quality
measurement accuracy even if ductwork turns or variations are present before the unit inlet. For
the most accurate readings, a minimum of 1½ diameters, and preferably 3 diameters, of straightrun ductwork is recommended prior to the inlet connection.The straight-run ductwork should be
of the same diameter as the air valve inlet connection. If these recommendations are followed, and
the air density effects mentioned below are addressed, the flow ring will measure primary airflow
within ±5% of unit nominal airflow.

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Figure 21. Air pressure measurement orientations

Air Density Effects
Changes in air density due to the conditions listed below sometimes create situations where the
standard flow sensing calibration parameters must be modified.These factors must be accounted
for to achieve accuracy with the flow sensing ring. Designers, installers, and air balancers should
be aware of these factors and know of the necessary adjustments to correct for them.

Elevation
At high elevations the air is less dense.Therefore, when measuring the same differential pressure
at elevation versus sea level the actual flow will be greater at elevation than it would be at sea level.
To calculate the density at an elevation other than standard conditions (most manufacturers choose
sea level as the point for their standard conditions), you must set up a ratio between the density
and differential pressure at standard conditions and the density and differential pressure at the new
elevation.
P S dard Conditions
P New Conditions
----------------------------------------------------------------------------------- = ------------------------------------------------------------------DENSS  dard Conditions
DENSNew Conditions
Since the data from the manufacturer is published at standard conditions, this equation should be
solved for the differential pressure at standard conditions and the other quantities substituted to
determine the ratio for the differential pressure measured at the new conditions.

Duct Pressure and Air Temperature Variations
While changes in these factors certainly affect the density of air, most operating parameters which
VAV systems need keep these effects very small.The impact on accuracy due to these changes is
less than one half of one percent except in very extreme conditions (extreme conditions are defined
as those systems with static pressures greater than 5 in. wg (1245 Pa) and primary air temperatures
greater than 100°F (37.8°C)). Since those types of systems occur so infrequently, we assume the
effects of duct pressure and air temperature variations to be negligible.

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Linearity
With the increase in DDC controls over pneumatic controls, the issue of linearity is not as great as
it once was.The important aspect of flow measurement versus valve position is the accuracy of
the controller in determining and controlling the flow. Our units are tested for linearity and that
position versus airflow curve is downloaded and commissioned in the factory to insure proper
control of the unit.

Reheat Options
Figure 22. Hot water coil (L) & hot water valves (R)

Hot water heating coils are generally applied on VAV terminal units as reheat devices. When
applying these coils it is important to make sure that they are operating in the proper air flow and
water flow range. Either a two-way or a three-way valve controls the coils.
The most important factor when sizing valves is the coefficient of velocity or CV.The CV is defined
as the flow rate, in gallons of 60°F (15.56°C) water, that will pass through the valve in one minute
with a one pound pressure drop.The coefficient of velocity, which is commonly called the flow
coefficient, is an industry standard rating. Valves having the same flow coefficient rating,
regardless of manufacturer, will have the same waterside performance characteristics.
The equation that governs valve sizing is:
C v = GPM
-------------P

Where
Cv=Flow coefficient
GPM=The maximum water flow rate through the valve in gallons per minute
P=The maximum allowable differential pressure across the valve in psi
The flow and differential pressure are generally the known quantities.The equation is solved for
the flow coefficient.The flow coefficient is then compared to the published CV values for the control
valves that are available.The control valve with the CV that is the closest, but greater than, the
calculated flow coefficient is the correct choice for the control valve.This choice will keep the valve
pressure drop below the maximum allowable valve pressure drop.The valve pressure drop should
then be checked against the coil pressure drop. If the coil pressure drop is appreciably larger than
the valve pressure drop, a valve with a smaller CV should be selected to produce a larger control
valve pressure drop. If this new valve has a pressure drop that is much larger than the maximum
allowable pressure drop for valves, the system designer should be consulted to make sure that the
system hot water pumps can deliver the water at the new conditions.

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Electric Reheat
Electric heating coils are applied onVAV terminal units as terminal reheat devices. Electric heat coil
capacity is rated in kilowatts (kW). Coils are available with the total capacity divided into one, two,
or three stages.
Electric heat coils are available in single-phase or three-phase models.This refers to the type of
power source connected to the coil. Single-phase models have resistance elements internally
connected in parallel.Three- phase models have resistance elements internally connected in a
delta or a wye configuration.
The current draw for the electric coil will depend upon whether it is a single-phase coil or a threephase coil.The current draw is necessary for determining what size wire should be used to power
the electric coils and how big the primary power fusing should be.
The equations for current draw for these coils are:
kW  1000 1amps = ------------------------------------------------Primary Voltage
kW  1000
3amps = ---------------------------------------------------------PrimaryVoltage 3
VariTrane three-phase electric heat is available in balanced configurations. For example, a 9 kW
three-phase coil, each stage would carry 1/3 or 3 kW of the load.
It is important to note that these coils have certain minimum airflow rates for each amount of kW
heat the coil can supply to operate safely.These airflow values are based upon a maximum rise
across the electric heat coil of 50°F (28°C).
The equation that relates the airflow across an electric coil to the temperature rise and the coil
change in temperature is:
 3145CFM = kW
-----------------------------T
Where
CFM=Minimum airflow rate across the coil
kW=The heating capacity of the electric coil
3145=A constant
P=The maximum rise in air temperature across the coil (usually 50 degrees F (28 degrees C))
Electric heat coils are available with magnetic or mercury contactors. Magnetic contactors are less
expensive than mercury contactors. However, mercury contactors can be cycled at a more rapid
rate without failing. Mercury contactors are rated for heavier duty use and should be used in as
many applications as possible. For pneumatic applications the electric coils are available with
factory-installed pressure-electric switches.

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Application Considerations

Insulation
Encapsulated edges
Insulation in aVAV terminal unit is used to avoid condensation
on the outside of the unit, to reduce the heat transfer from the
cold primary air entering the unit, and to reduce the unit noise.
The VariTrane line offers four types of unit insulation.The type
of facing classifies the types of insulation.To enhance IAQ
effectiveness, edges of all insulation types have metal
encapsulated edges.

Matte-Faced
This type of insulation is used for typical applications. It consists of a fiberglass core covered by
a high-density skin.The dual-density construction provides good sound attenuation and thermal
performance.

Foil-Faced
This type of insulation is used in applications where there is some concern regarding airborne
contaminants entering the space, or dirt being trapped in the fibers of the insulation.The insulation
is composed of a fiberglass core laminated to a foil sheet. Foil-faced insulation will provide the
same sound attenuation performance as matte-faced insulation.

Double-Wall
This type of insulation is used in applications where there is extreme concern regarding airborne
contaminants entering the space or dirt being trapped in the fibers of the insulation.The insulation
is the same as the matte-faced insulation. However, after the insulation is installed, a second solid
wall of 26-gage steel covers the insulation. All wire penetrations of this insulation are covered by
a grommet.This type of insulation will result in higher discharge and radiated sound power.

Closed-Cell
This type of insulation is used in applications where IAQ and fibers are of primary concern.The
acoustics of the closed-cell insulation are similar to double-wall insulation.The thermal properties
are similar to fiberglass insulation.This insulation contains no fiberglass.

Acoustics
Acoustical Best Practices
Acoustics with terminal units is sometimes more confusing than it needs to be. As we know, lower
velocities within a unit leads to improved acoustical performance. Additionally, if the VAV terminal
unit has a fan, a lower RPM provides better Acoustical performance. It is as simple as that—there
are some catches, however.
Additional considerations will be discussed in more detail throughout this portion of Application
Considerations, such as unit size and type, appurtenance affects (due to insulation, attenuation,
etc.), certification, and computer modeling. Let’s take a look at the first consideration, sizing of
units.

226

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Application Considerations

Sizing of Units
Before blindly increasing the size of units, we must first understand what is setting the acoustics
within the space. In general, over 95% of acoustics in VAV terminal units, which set the sound
pressure levels and ultimately the NC within the space, is from radiated sound.This is readily
known for fan-powered units, but less commonly known for single- and dual-duct units. Radiated
sound emanates from the unit and enters the occupied space via means other than through the
supply ductwork.The most typical path is through the plenum space, then through the ceiling, then
into the occupied space. While discharge sound should never be ignored, radiated sound is the
most dominant and usually the most critical sound source.
When increasing air valve sizes, BE CAREFUL. Oversizing an air valve can adversely impact
the ability to modulate and properly control temperature in the space. In extremely
oversized situations, the air valve will operate like a two-position controlled device, with air either
being “on”, or “off”, and not really much in between.The best way to avoid this is to understand that
the minimum for most air valves is 300 FPM.This is a function of the flow sensing device and the
ability of the pressure transducer and controller to properly read and report flow.This is not
manufacturer specific, as physics applies to all.Therefore, when sizing air valves, regardless of the
max cooling velocity the minimum velocity for proper pressure independent flow is 300 FPM.
Modulation capability and range is vital for proper operation ofVAV systems.With oversized units,
the unit will act as a constant volume system eliminating the energy savings and individual zone
control advantages ofVAV systems. A good rule of thumb is to size cooling airflow for around 2000
FPM. VAV systems only operate at full flow when there is a maximum call for cooling in the zone.
The greatest portion of the time, an air valve will be operating at partial flows.
When sizing fan-powered units, the fan airflow range can be determined by looking at the fancurve. Because parallel and series fan-powered units operate at a constant fan flow, selections can
be made all the way to the lowest flow ranges of the fan curve. A good balance of performance and
cost is to select fans at 70-80% of maximum fan flow.

Series vs. Parallel Fan-Powered Units
Acoustical considerations may affect whether a series or parallel fan-powered terminal unit is
selected. Both units have their advantages.
The parallel unit has the advantage of fan energization and fan acoustical impact only when heating
is needed. Parallel fans are smaller than series units because they are sized for 30–60% of total unit
flow.This creates a unit which is quieter than series units.The disadvantage of the parallel unit is
intermittent sound.This impact can be minimized by using an ECM, which has slow fan ramp-up
speed.
The primary acoustic benefit to the series fan-powered unit is that the fan runs continuously.
Sometimes the unit can be selected at slightly higher sound levels due to the constant nature of
the sound.
The primary acoustic disadvantage the series unit has compared to the parallel unit is the need to
size the unit fan for the total room airflow. Series units require a larger, louder fan than parallel
configurations.
Note: Operating parallel units with a continuously operating fan may be considered for some
applications.This provides the quietest overall fan-powered system with the benefit of
continuous fan operation. See your localTrane sales engineer for more details.

Insulation types
Insulation is a factor to consider when dealing with the acoustics of terminal units. Most insulation
types will provide similar acoustical results, but there are exceptions. Double-wall and closed-cell
foam insulation will generally increase your sound levels because of the increased reflective
surface area that the solid inner-wall and closed-cell construction provides.This increase in sound
will have to be balanced with the IAQ and cleanability considerations of the dual-wall and closedcell construction.

VAV-PRC012-EN

227

Application Considerations

Placement of units
Unit placement in a building can have a significant impact on the acceptable sound levels. Locating
units above non-critical spaces (hallways, closets, and storerooms) will help to contain radiated
sound from entering the critical occupied zones.

Unit Attenuation
Terminal unit-installed attenuators are an option available to provide path sound attenuation.
Manufacturer-provided attenuators on the discharge of a terminal unit are targeted at reducing
discharge path noise and are typically a simple lined piece of ductwork. It would often be easier and
less expensive to design the downstream ductwork to be slightly longer and require the installing
contractor to include lining in it. Attenuators on the plenum inlet of fan-powered terminals are
targeted at reducing radiated path noise since the plenum opening on a fan-powered terminal unit
is typically the critical path sound source. Significant reduction in radiated path noise can result
from a well-designed inlet attenuator.The attenuation from these attenuators is due to simple
absorption from the attenuator lining and occupant line of sight sound path obstruction.Therefore,
longer attenuators and attenuators that require the sound to turn multiple corners before reaching
the occupied space provide superior results, particularly in the lower frequency bands.
Table 141. Octave band frequencies
Octave Band

Center Frequency

Band Edge Frequencies

1
2

63
125

44.6-88.5
88.5-177

3

250

177-354

4

500

354-707

5

1000

707-1414

6

2000

1414-2830

7

4000

2830-5650

8

8000

5650-11300

Attenuators that are simple “cups” at the plenum inlet(s) have been shown inTrane’s acoustical
mock-up to provide no measurable reduction in sound pressure in the critical octave bands which
set the occupied space noise criteria.

Certification and Testing
Terminal units should be submitted based on the same criteria.There are several ways to ensure
this by certification and testing.
Raw unit sound data can be good measurement criteria for evaluation. In using this as a basis for
comparison, the designer needs to make sure that the information is based on the AHRI Standard
880 that gives the procedure for testing.
Specifying NC or RC sound levels is a possible comparison, but the designer needs to be sure the
comparison is fair.Two options are to specify the attenuation effect on which you would like the
units to be evaluated or to specify that AHRI Standard 885-2008 transfer functions be used.The
importance of AHRI Standard 885-2008 is that it is the first AHRI Standard that specifies exact
transfer functions to be used for evaluation. Previous versions of the standard gave guidelines, but
the manufacturers could choose their own set of factors.

228

VAV-PRC012-EN

Application Considerations

By using NC sound levels, it is possible to express acceptable sound levels for various types of
buildings or environments. A few examples are:
Concert Hall

NC-22

Hospital Room

NC-30

School Room

NC-35

General Office

NC-40

Cafeteria

NC-45

Factory

NC-65

Path Attenuation
Sound is generated by a terminal unit can reach the occupied space along several paths.The
terminal unit generated sound will lose energy—i.e., the energy is absorbed by path obstacles—
as it travels to the occupied space.This acoustical energy dissipation as it travels to the occupied
space is called path attenuation.The amount of energy lost along a particular path can be
quantified and predicted using the procedure outlined in AHRI-885. Each path must be considered
when determining acceptable sound power generated by a terminal unit.
The term “transfer function” is often used to describe the entire path attenuation value for each
octave band (i.e., the sum of all components of a particular path).
Examples of path attenuation include locating the terminal unit away from the occupied space,
increasing the STC (sound transmission classification) of the ceiling tile used, internally lining
ductwork, drywall lagging the ceiling tiles or enclosing the terminal unit in drywall. All of these
choices have costs associated with them that must be weighed against the benefits. Some of these
alternatives can be acoustically evaluated from application data provided in AHRI-885. Others may
require professional analysis from an acoustical consultant.

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Application Considerations

Computer Modeling
Computer modeling of acoustical paths is available to help estimate sound levels and determine
problem sources.The software used byTrane for computer modeling is calledTrane Acoustics
Program (TAP™).
TAP can analyze different room configurations and materials to quickly determine the estimated
total sound levels (radiated and discharged) in a space.TheTrane Official Product Selection System
(TOPSS™) can also be used to determine sound levels of terminal units.You can base selections
on a maximum sound level and enter your own attenuation factors (defaults based on AHRI-885
are also available).

Other Resources
Refer to "Additional References" at the end of this chapter to see a list of publications to help with
the basics of acoustical theory and modeling.You can also contact your localTrane salesperson
to discuss the issue.

Duct Design
Designing cost-effective VAV duct systems is challenging. Some duct design methods result in
better pressure balance than others do. Duct shape and duct material can influence duct system
design and cost. In addition, duct layout is properly designed for optimal duct installation and
operation.

Duct Design Program
Trane has developed a computer program, VariTrane™ Duct Designer, to aid in the duct design
process.This program is used to calculate duct sizes, fitting sizes, terminal unit sizes, and pressure
drops according to the equal friction or static regain method.The duct design program can be
easily incorporated into the selection ofVAV terminal units.The inputs and outputs for the program
enableVariTrane units to be selected based on the conditions you require.This makes selecting and
scheduling units much easier. Contact the local sales office or theTrane C.D.S.™ department for
more details on this program.

Design Methods
The two most widely used supply duct design methods—equal friction and static regain—are
discussed below.
Equal Friction – Using this method, ducts are sized at design flow to have roughly the same static
pressure drop for every 100 feet of duct. Static pressures throughout the duct system can be
balanced at design flow using balancing dampers, but are no longer balanced at part load flows.
For this reason, equal friction duct designs are better suited for constant volume systems than for
VAV systems. If the equal friction method is used for theVAV supply duct design, the terminal units
usually require pressure-independent (PI) control capability to avoid excessive flow rates when
duct pressures are high.
In VAV systems, the ducts located downstream of the terminal unit are usually sized for equal
friction.The advantage of this design method is its simplicity. Often, calculations can be made
using simple tables and duct calculators. Drawbacks include increased higher total pressure drops
and higher operating costs.
Static Regain – In the static regain method, ducts are sized to maintain constant static pressure
in each section, which is achieved by balancing the total and velocity pressure drops of each
section. In other words, static pressure is “regained” by the loss of velocity pressure. Since the
static pressures throughout the duct system are roughly balanced at design and part load flow,
static regain duct designs can be used successfully for either constant volume or VAV systems.
When the static regain method is used for VAV systems, the system is roughly pressure balanced
at design.

230

VAV-PRC012-EN

Application Considerations

Advantages of the static regain method include reduced total pressure drops, lower operating
costs, and balanced pressures over a wide range of flows.The drawback of this design is the timeconsuming, iterative calculation procedure and for large systems, it is essential to have a duct
design computer program.

Best Practices
Common Mistakes
Some of the most common system or installation errors are discussed below.

Reducers at Unit Inlet
This problem is a very common issue that is seen in applications of VariTrane products. It is often
mistaken by those in the field as an unacceptably large static pressure drop through the unit. It is
also sometimes mistaken as a malfunctioning flow ring, pressure transducer (if DDC or analog
electronic controls are present) or PVR (if pneumatic controls are present).
This problem is sometimes unknowingly encountered because of the capability of the VariTrane
unit to allow greater airflow for a specific size duct than other terminal units. For example, a project
engineer specifies an 8" (203 mm) round take off from the main duct trunk to theVAV terminal unit.
The person supplying the VAV terminal unit checks the required airflow and finds that a VariTrane
unit with a 6" (152 mm) inlet will provide the specified terminal unit performance.The terminal unit
supplier submits, receives approval, and orders the 6" (152 mm) inlet unit.While this is happening,
the installing contractor has run the connecting duct from the main trunk to the terminal unit in the
specified 8" (152 mm) round.The unit arrives at the job site, and the installer notices that the 8" (203
mm) duct and the 6" (152 mm) terminal unit inlet do not match.To get the unit installed, an 8- to
6-inch reducer is placed at the inlet to the terminal unit air valve.
The reducer will cause a phenomenon called flow separation at the unit inlet. Fluid dynamics
analysis can present a detailed technical explanation of flow separation, but the characteristics
important to this discussion are the production of pressure loss and turbulence.The reducer will
have a significant static pressure drop associated with it since the air velocity is increased (i.e.,
static pressure is given up for increased velocity pressure).The pressure loss is sometimes
mistaken as a loss due to the function of the terminal unit.The turbulence is at its greatest just
downstream of the reducer. Unfortunately, this is the location of the flow ring at the air-valve inlet.
The reducer will cause the flow ring to give an inaccurate and inconsistent reading because of the
turbulent air.
The solutions to this situation are:
•

Locate the reducer upstream of the terminal unit at least three duct diameters to eliminate flow
separation and turbulence at the unit inlet and to improve the airflow measurement accuracy.

•

Consider proper sizing of the terminal unit in the duct design and account for the pressure loss
of the reducer in the central fan selection if a reducer is required. Be cautious of “oversizing”
a VAV terminal. It is good practice to make sure that the inlet duct velocity at the minimum
airflow setting is no lower than 500 feet per minute.

Improper Use of Flexible Ductwork
While flexible ductwork has many benefits, improper use can cause numerous problems in a VAV
system. Flexible ductwork causes turbulent airflow and relatively large static pressure drops.
Flexible ductwork at a primary damper inlet (i.e., the flow sensor location) may cause flow accuracy
and repeatability problems due to turbulence.The use of flexible ductwork should be primarily
limited to the downstream side of the terminal units in a VAV system. Use of flexible ductwork
upstream of terminal units should be kept to an absolute minimum. All runs of flexible ductwork
should be kept as short as possible. While most know these guidelines, the ease of installation
which flexible ductwork provides is always an enticement to push the limits of what are acceptable
practices.

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231

Application Considerations

Static Pressure Measurement Errors
Improper measurement techniques for static pressure can lead many to mistakenly believe that the
terminal unit is causing a large pressure drop in the system.The chief error made here is taking a
static pressure measurement in turbulent locations such as flexible ductwork or near transitions.
This produces invalid static pressure readings. Another error commonly made is trying to read the
static pressure at the same point as the flow sensing device.The inlets to VAV terminal units
produce turbulence and will give poor readings. Flow sensors with their multiple-point averaging
capability are best equipped to deal with this type of flow, while a single-point static probe is not.
Another common error is the incorrect orientation of the static pressure probe.The static pressure
is correctly measured when the probe is oriented perpendicular to the direction of airflow.The
probe, or a part of it, should never be facing the direction of airflow, because the total pressure will
influence the reading of the probe.

Unit Conversions
Table 142. Conversions of length and area
To convert

From

To

Multiply by

Length
Length

In.
Ft

m
m

0.0254
0.3048

Length

m

In.

39.3701

Length

m

Ft

3.28084

Area

In.2

m2

0.00064516

Area

Ft2

m2

0.092903

Area

m2

In.2

1550

Area

m2

Ft2

10.7639

Table 143. Conversions of velocity, pressure, and flow rate

232

To convert

From

To

Multiply by

Velocity
Velocity

Ft/min
M/s

M/s
Ft/min

0.00508
196.850

Pressure

Psi

Pa

6894.76

Pressure

Ft of water

Pa

2988.98

Pressure

In. of water

Pa

249.082

Pressure

Pa

Psi

0.000145038

Pressure

Pa

Ft of water

0.000334562

Pressure

Pa

In. of water

0.00401474

Flow Rate

Cfm

L/s

0.4719

Flow Rate

Cfm

m3/s

0.000471947

Flow Rate

Gpm

L/s

0.0630902

Flow Rate

m3/s

Cfm

2118.88

Flow Rate

L/s

Cfm

2.1191

Flow Rate

L/s

Gpm

15.8503

VAV-PRC012-EN

Application Considerations

Additional VAV System and Product References
VAV Systems Air Conditioning Clinic
This clinic is designed to explain the system components, the system configurations, many of the
VAV system options and applications. A great resource for VAV system understanding.
Literature Order Number:TRG-TRC014-EN

Indoor Air Quality – A guide to understanding ASHRAE Standard 62-2001
The guide helps to explain the ASHRAE Standard as well as the fundamentals of good indoor air
quality. A great resource for understanding the standard and ways of designing VAV systems
around that standard.
Literature Order Number: ISS-APG001-EN

Managing Outdoor Air – Traq™ Comfort Systems
This brochure is a good, quick reference of the issues of managing outdoor air for a VAV system.
Literature Order Number: CLCH-S-26

Ventilation and Fan Pressure Optimization for VAV Systems
An engineering bulletin designed to how aTrane Integrate Comfort™ system can effectively
control building ventilation and supply fan pressure for increased comfort and IAQ while keeping
energy costs to the lowest possible.
Literature Order Number: SYS-EB-2

Trane DDC/VAV Systems Applications Engineering Manual
This manual gives detailed descriptions of theTrane DDC/VAV system.Topics include system
components, how the system interacts and specific inputs and outputs of the system.
Literature Order Number: ICS-AM-6

Acoustics in Air Conditioning Applications Engineering Manual
This manual describes the basic fundamentals, behavior, measurement, and control of sound, all
directed at the design of quiet systems.
Literature Order Number: FND-AM-5

VariTrac Catalog
®

The catalog will help explain features and benefits of VariTrac, how the VariTrac product works,
applications for the product, and selection procedures.
Literature Order Number: VAV-PRC003-EN
ASHRAE Handbook of Fundamentals
ASHRAE Handbook of HVAC Systems and Equipment
ASHRAE Handbook of HVAC Applications
ASHRAE Handbook of Refrigeration
Web sites:

VAV-PRC012-EN

•

www.ashrae.org

•

www.ahrinet.org

•

www.trane.com

233

Trane optimizes the performance of homes and buildings around the world. A business of Ingersoll Rand, the leader in
creating and sustaining safe, comfortable and energy efficient environments, Trane offers a broad portfolio of advanced
controls and HVAC systems, comprehensive building services, and parts. For more information, visit www.Trane.com.
Trane has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice.

© 2013Trane All rights reserved
VAV-PRC012-EN 16 Jul 2013

We are committed to using environmentally

Supersedes VAV-PRC012-EN (23 Jun 2013)

conscious print practices that reduce waste.



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