Trane Rooftop Wshp Installation And Maintenance Manual

2015-04-02

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Installation, Operation,
and Maintenance

Water-Source Comfort System
Axiom™ Rooftop

Models
60HZ

“E” and later Design Sequence
GER -036, -048, -060, -072, -090, -120, -150, -180, -240,-300

SAFETY WARNING
Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and airconditioning equipment can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or altered equipment
by an unqualified person could result in death or serious injury. When working on the equipment, observe all precautions in the literature and
on the tags, stickers, and labels that are attached to the equipment.

August 2013

WSHP-SVX12B-EN

Warnings, Cautions and Notices
Warnings, Cautions and Notices. Note that warnings,
cautions and notices appear at appropriate intervals
throughout this manual. Warnings are provide to alert
installing contractors to potential hazards that could result
in death or personal injury. Cautions are designed to alert
personnel to hazardous situations that could result in
personal injury, while notices indicate a situation that
could result in equipment or property-damage-only
accidents.
Your personal safety and the proper operation of this
machine depend upon the strict observance of these
precautions.
Read this manual thoroughly before operating or servicing
this unit.

municipalities may have additional requirements that
must also be adhered to for responsible management of
refrigerants. Know the applicable laws and follow them.

WARNING
Proper Field Wiring and Grounding
Required!
All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field
wiring poses FIRE and ELECTROCUTION hazards. To
avoid these hazards, you MUST follow requirements for
field wiring installation and grounding as described in
NEC and your local/state electrical codes. Failure to
follow code could result in death or serious injury.

ATTENTION: Warnings, Cautions, and Notices appear at

appropriate sections throughout this literature. Read
these carefully:
Indicates a potentially hazardous
situation which, if not avoided, could
result in death or serious injury.
Indicates a potentially hazardous
CAUTIONs situation which, if not avoided, could
result in minor or moderate injury. It
could also be used to alert against
unsafe practices.
a situation that could result in
NOTICE: Indicates
equipment or property-damage only
accidents.

WARNING

WARNING
Personal Protective Equipment (PPE)
Required!
Installing/servicing this unit could result in exposure to
electrical, mechanical and chemical hazards.
•

Before installing/servicing this unit, technicians
MUST put on all Personal Protective Equipment (PPE)
recommended for the work being undertaken.
ALWAYS refer to appropriate MSDS sheets and OSHA
guidelines for proper PPE.

•

When working with or around hazardous chemicals,
ALWAYS refer to the appropriate MSDS sheets and
OSHA guidelines for information on allowable
personal exposure levels, proper respiratory
protection and handling recommendations.

•

If there is a risk of arc or flash, technicians MUST put
on all Personal Protective Equipment (PPE) in
accordance with NFPA 70E or other country-specific
requirements for arc flash protection, PRIOR to
servicing the unit.

Important
Environmental Concerns!
Scientific research has shown that certain man-made
chemicals can affect the earth’s naturally occurring
stratospheric ozone layer when released to the
atmosphere. In particular, several of the identified
chemicals that may affect the ozone layer are refrigerants
that contain Chlorine, Fluorine and Carbon (CFCs) and
those containing Hydrogen, Chlorine, Fluorine and
Carbon (HCFCs). Not all refrigerants containing these
compounds have the same potential impact to the
environment.Trane advocates the responsible handling of
all refrigerants-including industry replacements for CFCs
such as HCFCs and HFCs.

Responsible Refrigerant Practices!
Trane believes that responsible refrigerant practices are
important to the environment, our customers, and the air
conditioning industry. All technicians who handle
refrigerants must be certified.The Federal Clean Air Act
(Section 608) sets forth the requirements for handling,
reclaiming, recovering and recycling of certain
refrigerants and the equipment that is used in these
service procedures. In addition, some states or
© 2013Trane All rights reserved

Failure to follow recommendations could result in death
or serious injury.

WARNING
Contains Refrigerant!
System contains oil and refrigerant under high
pressure. Recover refrigerant to relieve pressure before
opening the system. See unit nameplate for refrigerant
type. Do not use non-approved refrigerants, refrigerant
substitutes, or refrigerant additives.
Failure to follow proper procedures or the use of nonapproved refrigerants, refrigerant substitutes, or
refrigerant additives could result in death or serious
injury or equipment damage.
WSHP-SVX12B-EN

Warnings, Cautions and Notices

Introduction
WARNING
Hazardous Voltage w/Capacitors!
Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. Verify with an appropriate
voltmeter that all capacitors have discharged. Failure to
disconnect power and discharge capacitors before
servicing could result in death or serious injury.

WARNING
Fiberglass Wool!

Revision Summary.
WSHP-SVX12B-EN
Corrected dimensions and added center of gravity
information.

Trademarks
Axiom, Precedent, ReliaTel,TOPSS,Tracer, Voyager II,
Trane, and theTrane logo are trademarks or registered
trademarks ofTrane in the United States and other
countries.Trane is a business of Ingersoll Rand. All
trademarks referenced in this document are the
trademarks of their respective owners.
LonTalk is a registered trademark of Echelon Corporation.

Product contains fiberglass wool. Disturbing the
insulation in this product during installation,
maintenance or repair will expose you to airborne
particles of glass wool fibers and ceramic fibers known
to the state of California to cause cancer through
inhalation. Glass wool fibers may also cause
respiratory, skin or eye irritation.

NOTICE:
Equipment Damage From Ultraviolet
(UV) Lights!
The manufacturer does not recommend field
installation of ultraviolet lights in its equipment for the
intended purpose of improving indoor air quality. High
intensity C-band ultraviolet light is known to severely
damage polymer (plastic) materials and poses a
personal safety risk to anyone exposed to the light
without proper personal protective equipment.
Polymer materials commonly found in HVAC
equipment that may be susceptible include insulation
on electrical wiring, fan belts, thermal insulation,
various fasteners and bushings. Degradation of these
materials can result in serious damage to the
equipment.
The manufacturer accepts no responsibility for the
performance or operation of our equipment in which
ultraviolet devices were installed outside of the
manufacturer’s factory or its approved suppliers.

WSHP-SVX12B-EN

Table of Contents
Warnings, Cautions and Notices . . . . . . . . . . 2

Standard Warranty . . . . . . . . . . . . . . . . . . .58

Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3

Extended Warranty . . . . . . . . . . . . . . . . . .58

Model Number Descriptions . . . . . . . . . . . . . . 5
General Information . . . . . . . . . . . . . . . . . . . . . 6
Jobsite Inspection . . . . . . . . . . . . . . . . . . . 6
Jobsite Storage . . . . . . . . . . . . . . . . . . . . . 6
Unit Description . . . . . . . . . . . . . . . . . . . . . 6
System Input Devices and Functions . . . . 6
Field installed ONLY Accessories . . . . . . . 8
Component Location . . . . . . . . . . . . . . . . . 9

Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Unit Clearances . . . . . . . . . . . . . . . . . . . . 10

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
General Installation Checks . . . . . . . . . . . 30
Main Electrical Power Requirements . . . 30
Foundation for Rooftop Units . . . . . . . . . 30
Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Roof Curbs . . . . . . . . . . . . . . . . . . . . . . . . 31
Rigging the Unit . . . . . . . . . . . . . . . . . . . . 31
Supply/Return Pipe . . . . . . . . . . . . . . . . . 31
Drain Connection . . . . . . . . . . . . . . . . . . . 32
Horizontal Discharge Conversion . . . . . . 32
TCO-A Instructions . . . . . . . . . . . . . . . . . . 33
Field Installed Power Wiring . . . . . . . . . . 34
Field Installed Control Wiring . . . . . . . . . 34
Control Power Transformer . . . . . . . . . . . 34

Electrical Requirements . . . . . . . . . . . . . . . . . 38
Pre-Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Space Temperature Averaging . . . . . . . . 45
Test Modes . . . . . . . . . . . . . . . . . . . . . . . . 47
Pre-Startup Checklist . . . . . . . . . . . . . . . . 52

Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Initial Unit Start-up . . . . . . . . . . . . . . . . . . 53
Water Pressure Drop . . . . . . . . . . . . . . . . 54

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Preventive Maintenance . . . . . . . . . . . . . 55

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . 56
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
4

WSHP-SVX12B-EN

Model Number Descriptions
G

060

5,6,7

1 0 A

0 0 0 0 000

23 24 25 26 27 28 29

30-36

Digits 1-3 — Unit Configuration
GER=

High Efficiency Rooftop

Digit 17 — Control Types

Digit 4 — Development
Sequence

R
T

=
=

Digits 5-7 — Nominal Size (MBH)
036 =
048 =
060 =
072 =
090 =
120 =
150 =
180 =
240 =
300 =

3Ton
4Ton
5Ton
6Ton
7 1/2Ton
10Ton
12 1/2Ton
15Ton
20Ton
25Ton

Digit 8 — Voltage (Volts/Hz/
Phase)
1
2
3
4
5
8

=
=
=
=
=
=

208/60/1
230/60/1
208/60/3
460/60/3
575/60/3
230/60/3

Digit 9 — Heat Exchanger
1
2

=
=

Copper Water Coil
Cupro-nickel Water Coil

Digit 10 — Design Sequence

Digit 18 — T’stat/Sensor
Location
0
A

=
=

0
A

=
=

Heating and Cooling Circuit
Cooling ONLY Circuit

Digit 12 — Blower Configuration
1
2

=
=

Standard Blower
Oversized Blower Motor

Digit 13 — Freeze Protection
A
B

=
=

20 Degree Freezestat B/T
30 Degree Freezestat B/T

Digit 14 — Open Digit
0
S

=
=

Standard Design
Design Special

Digit 15 — Supply-Air
Arrangement
D
H

Down-Flow Supply-Air
Arrangement
(convertible for 3 - 10Ton)
= Horizontal Supply-Air
Arrangement
(12 1/2 - 25Ton option)

DIGIT 16 — Return-Air
Arrangement

Wall Mounted Location
Wall Mounted Sensor with Unit
Mounted Return-Air Smoke
Detector
Wall Mounted Sensor with Unit
Mounted Supply-Air Smoke
Detector
Wall Mounted Sensor with Unit
Mounted Return-Air/Supply-Air
Smoke Detectors

Digit 19 — Fault Sensors
0 =
A =
B =
C =
D =
Fail
E

Most Up-to-Date Design

Digit 11 — Refrigeration Circuit

ReliaTel™ Standalone Controls
Tracer™ Communication
Interface
LonTalk™ Communication
Interface

No Fault Sensor
Clogged Filter Switch
Fan Failure Switch
Discharge Air SensingTube
Clogged Filter Switch and Fan
Switch
Clogged Filter Switch and
Discharge Air SensingTube
Fan Fail Switch and Discharge Air
SensingTube
Clogged Filter Switch, Fan Fail
Switch and DA SensingTube

Digit 20 — Temperature Sensor
7

= High Pressure Control/Frostat/
Crankcase Heater

Digit 21 — Night Setback
0 = No Night Setback Relay
N = Night Setback Relay
Note: Option N is used for the Micro
Standalone Controller ONLY.

Digit 23 — Unit Mounted
Disconnect
0
1
2

=
=
=

Digit 24 — Filter Type
2
4
5

=
=
=

=
=
=
=
=
=
=
=
=
=
=
=

No Electric Heat
5 kW (1-Phase)
6 kW (3-Phase)
9 kW (3-Phase)
10 kW (1-Phase)
12 kW (3-Phase)
14 kW (1-Phase)
18 kW (1 and 3-Phase)
23 kW (3-Phase)
27 kW (3-Phase)
36 kW (3-Phase)
54 kW (3-Phase)

2"Throwaway Filter
2" MERV 8 Filter
2" MERV 13 Filter

Digit 25 — Acoustic
Arrangement
0

Sound Attenuation Package

Digit 26 — Factory
Configuration
0
A

=
=

Standard Factory Configuration
Hinged Access Panels

Digit 27 — Paint Color
0

No Paint Selection Available

Digit 28 — Outside Air Option
0
A

=
=

Relief
F =
G

Digit 22 — Electric Heat Option
0
A
B
C
D
E
F
G
J
K
N
P

No Unit Mounted Disconnect
Non-Fused Disconnect
Circuit Breaker

No Outside Air
Manual Outside Air Damper
0-25%
Motorized Outside Air Damper
0-50%
Economizer, Dry Bulb 0-100%
without Barometric Relief
Economizer, Dry Bulb 0-100%
with Barometric Relief
Economizer, Reference Enthalpy
0-100% without Barometric
Economizer, Reference Enthalpy
0-100% with Barometric Relief
Economizer, Comparative
Enthalpy 0-100%
without Barometric Relief
Economizer, Comparative
Enthalpy 0-100%
with Barometric Relief

Digit 29 — Piping Arrangement
0

Standard Piping Configuration

Digits 30-36 — Does Not Apply
To The Rooftop Product
0000000= Digit 30-36 Does NOT Apply to
the Rooftop Products
Note: Through-the-base electric is a
standard feature on the watersource rooftop unit.

0 = Standard Return-Air
Arrangement

WSHP-SVX12B-EN

General Information
Jobsite Inspection
Always perform the following checks before accepting a
unit:
•

Verify that the nameplate data matches the data on the
sales order and bill of lading (including electrical data).

•

Verify that the power supply complies with the unit
nameplate specifications.

•

Visually inspect the exterior of the unit, for signs of
shipping damage. Do not sign the bill of lading
accepting the unit(s) until inspection has been
completed. Check for damage promptly after the
unit(s) are unloaded. Once the bill of lading is signed at
the jobsite, the unit(s) are now the property of the
SOLDTO party and future freight claims MAY NOT be
accepted by the freight company.

•

After assuring that charge has been retained, reinstall
the schrader caps to assure that refrigerant leakage
does not occur.

•

After assuring that charge has been retained, reinstall
the schrader caps to assure that refrigerant leakage
does not occur.

•

Verify that the refrigerant charge has been retained
during shipment by use of gauges. Schrader taps are
located internal to the cabinet.

•

After assuring that charge has been retained, reinstall
the schrader caps to assure that refrigerant leakage
does not occur.

Jobsite Storage
Take precautions to prevent condensate from forming
inside the unit’s electrical compartments and motors if:
•

If the unit is stored before it is installed.

•

The unit is set on the roof curb, and temporary heat is
provided in the building. Isolate all side panel service
entrances and base pan openings (e.g. conduit holes,
supply air/return air openings, and flue openings) from
the ambient air until the unit is ready for start-up.

The manufacturer will not assume any responsibility for
equipment damage resulting form condensate
accumulation on the unit’s electrical and/or mechanical
components.

Unit Description
Before shipment, each unit is leak tested, dehydrated,
charged with refrigerant and compressor oil, and run
tested for proper control operation.

Unit Nameplate
The unit nameplate is located on the units’s corner support
just above the main power entrance access into the control
panel. It includes the unit model number, serial number,

electrical characteristics, refrigerant charge, and other
pertinent unit data.

Compressor Nameplate
The nameplate for the compressors are located on the
compressor terminal box.

Air-to-Refrigerant Coil
The air-to-refrigerant coil is aluminum fin, mechanically
bonded to the copper tubing.

Water-to-Refrigerant Coil
The water-to-refrigerant coil is a copper or cupro-nickel
(option) and steel tube (tube-within-a-tube) design, leak
tested to assure there is no cross leakage between the
water tube (copper/cupro-nickel) and refrigerant gas (steel
tube).
The control system offered to control the unit is a
ReliaTel™ Control Module. It may be installed as a
standalone unit control module, or tied to a full building
automation system.
The ReliaTel™ Control Module is a microelectronic control
module that is referred to as a Refrigeration Module
(RTRM).The acronym RTRM is used extensively
throughout this document when referring to the control
system network.
These modules through Proportional/Integral control
algorithms perform specific unit functions that govern unit
operation in response to zone temperature, supply air
temperature and/or humidity conditions depending on the
application.The stages of capacity control for these units
is achieved by starting and stopping the compressors.
The RTRM is mounted in the control panel and is factory
wired to the respective internal components. RTRM
receives and interprets information from other unit
modules, sensors, remote panels and customer binary
contacts to satisfy the applicable request for cooling.

System Input Devices and Functions
The RTRM must have a mode input in order to operate the
rooftop unit.The flexibility of having several mode
capabilities depends upon the type of sensor and/or
remote panel selected to interface with the RTRM.The
possibilities are; Fan selection ON or AUTO, System
selection HEAT, COOL, AUTO, and OFF.
The descriptions of the following basic input devices used
with the RTRM network are to acquaint the operator with
their function as they interface with the various modules.
Refer to the unit’s electrical schematic for the specific
module connections.

Compressor Disable (CPR1/2)
This input incorporates the low (LPC) of each refrigeration
circuit and can be activated by opening a field supplied
contact installed in series with the LPC.
WSHP-SVX12B-EN

General Information
If this circuit is open before the compressor is started, the
compressor will not be allowed to operate. Anytime this
circuit is opened for 5-continuous seconds during
compressor operation, the compressor for that circuit is
immediately turned OFF.The compressor will not be
allowed to restart for a minimum of 3-minutes should the
LPC close.
If four consecutive open conditions occur during the first
3-minutes of operation, the compressor for that circuit will
be locked out, a diagnostic communicated to the remote
panel (if installed) and a manual reset will be required to
restart the compressor.

Low Pressure Control
With the ReliaTel module, the low pressure will be
activated when a field supplied contact is opened.
Anytime this circuit is opened for 5-continuous seconds,
the compressor for that circuit is turned off immediately.
The compressor will not be allowed to restart for a
minimum of 3-minutes.
If four consecutive open conditions occur during the first
3-minutes of operation, the compressor will be locked out,
a diagnostic communicated to ICSTM if applicable, and a
manual reset will be required to restart the compressor.

High Pressure Control
The high pressure controls are wired in series between the
compressor outputs on the RTRM and the compressor
contactor coils. If the high pressure control switch opens,
the RTRM senses a lack of current while calling for cooling
and locks the compressor out.
On dual circuit units, if the high pressure control opens,
the compressor on the affected circuit is locked out. A
manual reset for the affected circuit is required.

Economizer Control Actuator ECA (option)
The ECA monitors the mixed-air temperature, return air
temperature, minimum position setpoint (local or
remote), power exhaust setpoint, CO2 setpoint, CO2 and
ambient dry bulb/enthalpy sensor or comparative
humidity (return air humidity against ambient humidity)
sensors, if selected, to control dampers to an accuracy of

RTLI-ReliaTel LonTalk Communication
Interface (option)
This module is used when the application calls for either
an ICS building management type control system that is
LonTalk. It allows the control and monitoring of the system
through an ICS panel.The module can be ordered from the
factory or ordered as a kit to be field installed. Follow the
installation instruction that ships with each kit when field
installation is necessary.

RTOM-ReliaTel Options Module (option)
The RTOM monitors the supply fan proving, clogged filter,
supply air temperature, exhaust fan setpoint, supply air
tempering, FrostatTM and smoke detector. Refer to
system input devices and functions for operation.

Supply Fan Failure Input (option)
The fan failure switch can be factory or field installed to
sense indoor fan operation. With the FFS-Fan Failure
Switch, if air flow through the unit is not proven by the
differential pressure switch (factory set point 0.07-inch
w.c.) within 40-seconds nominally, the RTRM will shut off
all mechanical operations, lock the system out, send a
diagnostic to ICS, and the service LED will flash.The
system will remain locked out until a reset is initiated
either manually or through ICS.

Clogged Filter Switch (option)
The unit mounted clogged filter switch monitors the
pressure differential across the return air filters. It is
mounted in the filter section and is connected to the
RTOM. A diagnostic service signal is sent to the remote
panel if the pressure differential across the filters is at least
0.5-inch w.c.The contacts will automatically open when
the pressure differential across the filters decreases to
approximately 0.4-inch w.c.The clogged filter output is
energized when the supply fan is operating and the
clogged filter switch has been closed for at least 2minutes.The system will continue to operate regardless of
the status of the filter switch.

Power Exhaust Control (option)

± 5% of stroke.The actuator is spring returned to the
closed position any time power is lost to the unit. It is
capable of delivering up to 25-inch pounds of torque and
is powered by 24 VAC.

The power exhaust fan is started whenever the position of
the economizer dampers meets or exceed the power
exhaust setpoint when the indoor fan is on.The setpoint
panel is located in the return air section, and is factory set
to 25%.

RTCI-ReliaTel Trane Communication Interface
(option)

Evaporator Frost Control (option)

This module is used when the application calls for an ICS
building management type control system. It allows the
control and monitoring of the system through an ICS
panel.The module can be ordered from the factory or
ordered as a kit to be field installed. Follow the installation
instruction that ships with each kit when field installation
is necessary.

WSHP-SVX12B-EN

This input incorporates the Frostat control (FOS) of each
refrigeration circuit and can be activated by closing a field
supplied contact installed in parallel with the FOS.
If this circuit is open before the compressor is started, the
compressor will not be allowed to operate. Anytime this
circuit is opened for 5-continuous seconds during
compressor operation, the compressor for that circuit is
immediately turned OFF.The compressor will not be

General Information
allowed to restart for a minimum of 3-minutes should the
FOS close.

Smoke Detector Sensor (option)
This sensor provides high limit shutdown of the unit and
requires a manual reset.The sensor is used to detect
smoke due to fire in the air conditioning or ventilation
ducts.
In order for the supply air smoke detector or return air
smoke detector to properly sense smoke in the supply/
return air stream, the air velocity entering the smoke
detector unit must be between 500 and 4000-feet per
minute.

Discharge Line Thermostat
A bi-metal element discharge line thermostats installed as
a standard option on the discharge line of each system.
This standard option provides extra protection to the
compressors against high discharge temperatures in case
of loss of charge, extremely high ambient and other
conditions which could drive the discharge temperature
higher.

Field installed ONLY Accessories
High Temperature Sensor (BAYFRST002A)
This sensor connects the RTRM Emergency Stop Input
LTB1-5 and LTB1-6 and provides high limit shutdown of the
unit and requires a manual reset.The sensor is used to
detect high temperatures due to fire in the air conditioning
or ventilation ducts.The sensor is designed to mount
directly to the sheet metal duct. Each kit contains two
sensors.The return air duct sensor (X13100040010) is set
to open at 135-degrees F.The supply air duct sensor
(X13100040020) is set to open at 240-degrees F.The
control can be reset after the temperature has been
lowered approximately 25-degrees F below the cutout
setpoint.

Electronic Timeclock (BAYCLCK001A)
This electronic timeclock is designed to control the
occupied/unoccupied switching of up to four rooftop units.
Once the unit(s) has entered an unoccupied status, night
setback temperatures can be controlled by utilizing a
standard zone sensor wired to the RTRM.The timeclock
contains four binary outputs (RE1, RE2, RE3, RE4), a liquid
crystal display (LCD), and four programming keys (Time/
Day Key, Occupied/Unoccupied Program Key, Run Key,
and an Advance/Override Key). An 18 to 30-VAC power
source is required either from one of the units being
controlled or from a separate class-2 power source.

Zone Panel (BAYSENS106A)
This electronic sensor features three system switch
settings (EM HEAT, HEAT, COOL, and OFF) and two fan
settings (ON and AUTO). It is a manual changeover control
with single setpoint capability.

Zone Panel (BAYSENS108A)
This electronic sensor features four system switch settings
(HEAT, COOL, AUTO, OFF) and two fan settings (ON and
AUTO). It is a manual or auto changeover control with dual
setpoint capability. It can be used with a remote zone
temperature sensor BAYSENS017B.

Remote Panel w/o NSB (BAYSENS110A)
This electronic sensor features four system switch settings
(HEAT, COOL, AUTO, and OFF) and two fan settings (ON
and
AUTO) with four system status LED’s. It is a manual or auto
changeover control with dual setpoint capability. It can be
used with a remote zone temperature sensor
BAYSENS017B.

Programmable Zone Sensor (BAYSENS019B)
This 7-day programmable sensor features 2, 3, and 4periods for Occupied/Unoccupied programming per day.
If the power is interrupted, the program is retained in
permanent memory. If power is off longer than 2-hours,
only the clock and day may have to be reset.
The zone sensor allows selection of 2, 3, and 4 system
modes (HEAT, COOL, AUTO, and OFF), two fan modes (ON
and AUTO) It has dual temperature selection with
programmable start time capability.
The occupied cooling setpoint ranges between 45 and 98degrees F.The heating setpoint ranges between 43 and 96degrees F.
A liquid crystal display (LCD) displays zone temperature,
temperature set points, day of the week, time, and
operational mode symbols.
The option menu is used to enable or disable applicable
functions, (i.e. morning warm-up, economizer minimum
position override during unoccupied status, fahrenheit or
centigrade, supply air tempering, remote zone
temperature sensor, 12/24-hour time display, smart fan,
and computed recovery.
During an occupied period, an auxiliary relay rated for
1.25-amps at 30-volts AC with one set of single pole,
double throw contacts is activated.

Remote Zone Sensor (BAYSENS013C)
This electronic sensor features remote zone sensing and
timed override with override cancellation. It is used with a
Trane Integrated ComfortTM building management
system.

Remote Zone Sensor (BAYSENS014C)
This electronic sensor features single setpoint capability
and timed override with override cancellation. It is used
with aTrane Integrated ComfortTM building management
system.

WSHP-SVX12B-EN

General Information
Remote Zone Sensor (BAYSENS016A)
This bullet type temperature sensor can be used for
outside-air ambient sensing, return air temperature
sensing, supply air temperature sensing, remote
temperature sensing (uncovered).Wiring procedures vary
according to the particular application and equipment
involved. Refer to the unit’s wiring diagrams for proper
connections.

remote panel, wiring must be 18 AWG shielded twisted
pair (Belden 8760 or equivalent). Refer to the specific
remote panel for wiring details.

Component Location
1. Controls
2. Compressor/water-to-refrigerant section
3. Air-to-refrigerant coil

Remote Zone Sensor (BAYSENS017B)

4. Filter location

This electronic sensor can be used with BAYSENS106A,
108A, 110A, 019A, 020A, or 021A remote panels. When this
sensor is wired to a BAYSENS019A or BAYSENS020A

5. Blower and motor location

WSHP-SVX12B-EN

Dimensions
Unit Clearances

WSHP-SVX12B-EN

Dimensions
Figure 1.

036 to 048 Clearances

3-4 tons economizer, manual or
motorized fresh air damper

3-4 tons - swing diameter for hinged
door(s) option

Note: All dimensions are in inches/millimeters.

17 7/8"
(448 MM)

16"
(406 MM)

22 1/4"
(565 MM)

3-4 tons - economizer & barometric relief
damper hood
Note: All dimensions are in inches/millimeters.

WSHP-SVX12B-EN

Dimensions

Figure 2.

060 to 072 Clearances

5-6 tons - economizer, manual or motorized fresh air damper
Note: All dimensions are in inches/millimeters.

5-6 tons - swing diameter for hinged door(s) option
Note: All dimensions are in inches/millimeters.

21 3/8”
(543 MM)

17”
(432 MM)

34 5/8”
(879 MM)

WSHP-SVX12B-EN

Dimensions

Figure 3.

090 Clearances

7½ tons power exhaust

7½ tons swing diameter for hinged door(s) option

Note: All dimensions are in inches/millimeters.

21 3/8"
543 MM

17"
432 MM
34 5/8"
879 MM

7½ tons manual or motorized fresh air damper
Note: All dimensions are in inches/millimeters.

WSHP-SVX12B-EN

Dimensions
Figure 4.

120 Clearances

10 tons swing diameter for hinged door(s) option

10 tons exhaust

Note: All dimensions are in inches/millimeters.

5 5/8"
(143 MM)

ECONOMIZER HOOD
21 5/8"
(549 MM)

10 tons economizer, manual or motorized fresh air damper
Note: All dimensions are in inches/millimeters.

ECONOMIZER HOOD

BAROMETRIC RELIEF HOOD

7 3/4”
(198 MM)

12”
(304 MM)

6 7/8”
(175 MM)
16 3/4”
(425 MM)

WSHP-SVX12B-EN

Dimensions

Figure 5.

150 - 300 Clearances

Fresh Air Hood (Horizontal Units)

Economizer - Horizontal Units

When applying economizer to horizontal units, connected ductwork must be run full size to
allow proper operation of economizer damper.
Power Exhaust Dimensions
Unit Model # A
B
C
GERE150-240 19½ 64¾ 39

WSHP-SVX12B-EN

Dimensions

Figure 6.

3 to 4-Ton Unit

WSHP-SVX12B-EN

Dimensions

Figure 7.

5 -Ton Unit

WSHP-SVX12B-EN

Dimensions
Figure 8.

6 -Ton Unit

WSHP-SVX12B-EN

Dimensions

Figure 9.

7 1/2-Ton Unit

WSHP-SVX12B-EN

Dimensions

Figure 10.

10 -Ton Unit

WSHP-SVX12B-EN

Dimensions

Figure 11.

12 1/2 and 15-Ton Unit

20 13/16"
529mm

12 5/16"
313mm

23"
584mm

54"
1372mm
26 7/8"
684mm

(a) See tables in chapter “General Data,” p. 13, for water connection sizes.

WSHP-SVX12B-EN

Dimensions

Figure 12. 20-Ton Unit

20 7/8"
530mm

12 1/2"
317mm

24 1/4"
616mm

WSHP-SVX12B-EN

Dimensions

Figure 13. 25-Ton Unit

20 13/16"
529mm
12 5/16"
313mm

85 5/16"
2167mm

54"
64”
1372mm
1626 mm

26 7/8"
264mm

(a) See tables in chapter “General Data ” p 13 for water connection sizes

WSHP-SVX12B-EN

Dimensions
Figure 14. 3 to 4-Ton Roofcurb

WSHP-SVX12B-EN

Dimensions

Figure 15. 5, 6 and 7 1/2 -ton roofcurb

20 13/16"
529mm

12 5/16"
313mm

23"
584mm

54"
1372mm
26 7/8"
684mm

(a) See tables in chapter “General Data,” p. 13, for water connection sizes.

WSHP-SVX12B-EN

Dimensions

Figure 16. 10 -Ton Roofcurb

20 7/8"
530mm

12 1/2"
317mm

24 1/4"
616mm

WSHP-SVX12B-EN

Dimensions

Figure 17.

12 1/2 to 25-Ton Roofcurb

20 13/16"
529mm
12 5/16"
313mm

85 5/16"
2167mm

54"
64”
1372mm
1626 mm

26 7/8"
264mm

(a) See tables in chapter “General Data,” p. 13, for water connection sizes.

WSHP-SVX12B-EN

Dimensions
Figure 19. Rigging

WARNING
Heavy Objects!
Do not use cables (chains or slings) except as shown.
Each of the cables (chains or slings) used to lift the unit
must be capable of supporting the entire weight of the
unit. Lifting cables (chains or slings) may not be of the
same length. Adjust as necessary for even unit lift.
Other lifting arrangements may cause equipment or
property-only damage. Failure to properly lift unit could
result in death or serious injury. See details below.
Figure 18. Corner weight locations and center of
gravity

Center
of Gravity
Length

nter of Gravity
Width

D
Center of Gravity

Table 1.

Typical unit weights and point loading data

Net
Model Weight

Corner Weights

Center of Gravity
Length

Width

036

487

132

121

112

121

33.0

19.0

048

538

146

134

124

134

33.0

19.0

060

678

188

164

154

173

40.5

23.0

072

700

194

169

159

179

40.5

23.0

090

794

218

194

182

201

41.0

23.0

120

941

235

251

234

221

52.0

28.0

150

1800

491

481

410

418

60.0

32.0

180

1848

505

493

421

429

60.0

32.0

240

2008

548

536

458

466

60.0

32.0

300

1906

520

509

435

442

30.0

32.0

Table 2.

Net weights for electric heat are as follows

Unit Size

23-36 kW

54 kW

72 kW

GER 150, 180, 240, 300

33/27

40/32

43/34

WSHP-SVX12B-EN

Dimensions
Table 3.

Option and accessory weights

Option/Accessory Description Net Weight 036-060 Net Weight 072-120 Net Weight 150-180, 300 Net Weight 240
Electric Heat

Economizer H/D

65/80

Motorized Damper

60/75

Manual Damper

N/A

Barometric Relief
Power Exhaust
Oversized Motor
Belt Drive Motor (3-phase only)

Standard

Hinged Access

Hail Guard

Through the base electrical

Unit Disconnect Switch

Unit Circuit Breaker

TCI, LCI

Frostat

Crankcase Heater

Smoke Detector, Return

Smoke Detector, Supply

Clogged Filter Switch

Fan Fail Switch

Discharge Air Tube

115

235

Roof curb
Zone Sensors

WSHP-SVX12B-EN

Installation
General Installation Checks
The checklist below is a summary of the steps required to
successfully install a commercial unit.This checklist is
intended to acquaint the installing personnel with what is
required in the installation process. It does not replace the
detailed instructions called out in the applicable sections
of this manual.
•

Check the unit for shipping damage and material
shortage; file a freight claim and notify appropriate
sales representation.

Verify the power supply complies with the unit
nameplate specifications.

•

Verify the correct model, options and voltage from the
unit nameplate.

•

Inspect all control panel components; tighten any
loose connections.

•

Verify the installation location of the unit will provide
the required clearance for proper operation.

•

Assemble and install the roof curb (if applicable). Refer
to the latest edition of the curb installers guide that
ships with each curb kit.

Connect properly sized and protected power supply
wiring to a field-supplied/installed disconnect switch
and to the main power terminal block (HTB1) in the unit
control panel.

•

Install proper grounding wires to an earth ground.

•

Fabricate and install duct work; secure duct work to the
curb.

Factory Installed Economizer
•

Ensure the economizer has been pulled out into the
operating position. Refer to the economizer installers
guide for proper position and setup.

•

Install all access panels.

Note: All field-installed wiring must comply with NEC
and applicable local codes.

Electric Heat Requirements
•

Verify that the power supply complies with the electric
heater specifications on the unit and heater nameplate.

•

Inspect the heater junction box and control panel;
tighten any loose connections.

Filter Installation

•

Check electric heat circuits for continuity.

•

Low Voltage Wiring (AC & DC) Requirements

•

Each unit ships with 1-inch filters.The quantity of filters
is determined by unit size. Access to the filters is
obtained by removing the fan access panel.To modify
the unit’s filter rack to accept 2-inch filters, remove the
L-shaped angle attachment screws and rotate the
angles 90-degrees.
Reinstall the screws and insert new filters. Refer to the
unit Service Facts (shipped with each unit) for filter
requirements.

Note: Do not operate the unit without filters.

Main Electrical Power Requirements
WARNING
Proper Field Wiring and Grounding
Required!
All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field
wiring poses FIRE and ELECTROCUTION hazards. To
avoid these hazards, you MUST follow requirements for
field wiring installation and grounding as described in
NEC and your local/state electrical codes. Failure to
follow code could result in death or serious injury.

•

Install the zone thermostat, with or without switching
subbase.

•

Connect properly sized control wiring to the proper
termination points between the zone thermostat and
the unit control panel.

Foundation for Rooftop Units
If the unit is installed at ground level (horizontal design),
elevate it above the snow line. Provide concrete footings at
each support location with a full perimeter support
structure or a slab foundation for support. Refer to Table 1,
p. 28 for the unit’s operating and point loading weights
when constructing a footing foundation.
If anchoring is required, anchor the unit to the slab using
hold down bolts or isolators. Isolators should be installed
to minimize the transmission of vibrations into the
building.
For rooftop applications, ensure the roof is strong enough
to support the combined unit and support structural
weight.

WSHP-SVX12B-EN

Installation

WARNING
Risk of Roof Collapsing!
Confirm with a structural engineer that the roof
structure is strong enough to support the combined
weight of the roofcurb and the unit. Refer to Table 1,
p. 28 and Table 3, p. 29 for typical unit and curb
weights. Failure to ensure proper structural roof
support could cause the roof to collapse, which could
result in death or serious injury and property damage.
If anchoring is required, anchor the unit to the roof with
hold-down bolts or isolators.

Note: For sound consideration, cut only the holes in the
roof deck for the duct work penetrations. Do not cut
out the entire roof deck within the curb perimeter.

If Curb Accessory Kit is not used:
The duct work can be attached directly to the factory
provided flanges around the unit’s supply and return air
openings. Be sure to use flexible duct connections at the
unit.
For built-up curbs supplied by others, gaskets must be
installed around the curb perimeter flange and the supply
and return air opening flanges.

Check with the contractor for proper waterproofing
procedures.

Note: For sound consideration, cut only the holes in the
roof deck for the duct work penetrations. Do not cut
out the entire roof deck within the curb perimeter.

Ductwork

Rigging the Unit

When attaching the ductwork to the unit, provide a
watertight flexible connector at the unit to prevent
operating sounds from transmitting through the
ductwork.

A rigging illustration and center-of-gravity dimensional
data table are shown in Table 1, p. 28. Refer to the typical
unit operating weights table before proceeding.

Elbows with turning vanes or splitters are recommended
to minimize air noise due to turbulence and to reduce static
pressure.

1. Remove the two screws from each end of the unit that
secures the wooden shipping top. Remove the wooden
top and metal retaining brackets. Remove the
protective covering from around the unit.

All outdoor ductwork between the unit and the structure
should be weather proofed after installation is complete.
See dimensional data on pages 13 through 16 for
connection sizes.

2. Rig the unit. Attach adequate strength lifting slings to
all four lifting brackets in the unit base rail. Do not use
cables, chains, or slings except as shown.

Roof Curbs
The roof curbs for these units (down flow) consists of a full
perimeter enclosure to support the unit. Before installing
any roof curb:
•

Verify that the correct roof curb is applied to the unit

•

Verify that the roof curb includes the necessary gaskets
and hardware.

•

Verify that the proposed installation location provides
the required clearance for proper unit operation.

•

Insure that the curb is level and square.The top surface
of the curb must be true to assure an adequate curb-tounit seal.

Step-by-step curb assembly and installation instructions
ship with each accessory roof curb kit. Follow the
instructions carefully to assure proper fit-up when the unit
is set into place.
To assure proper condensate flow during operation, the
unit (and curb) must be level.
If the unit is elevated, a field constructed catwalk around
the unit is strongly recommended to provide easy access
for unit maintenance and service.
Recommendations for installing the supply air and return
air ductwork joining the roof curb are included in the curb
instruction booklet. See dimensional data on pages 17
through 20 for roof curb sizing.
WSHP-SVX12B-EN

3. Install a lifting bar, (as shown in the illustration), to
protect the unit, and to facilitate a uniform lift.The
minimum distance between the lifting hook and the
top of the unit should be 7-feet.
4. Test lift the unit to ensure it is properly rigged and
balanced. Make any necessary rigging adjustments.
5. Lift the unit and position it into place.
6. Downflow units; align the base rail of the unit with the
curb rail while lowering the unit onto the curb. Make
sure that the gasket on the curb is not damaged while
positioning the unit.
7.

Set the unit onto the curb; check for levelness.

8. Ensure unit-to-curb seal is tight and without buckles or
cracks.
9. Install and connect a condensate drain line to the
evaporator drain connection.

Supply/Return Pipe
Connect the supply and return line to the water inlet and
outlet of the unit. On open loop systems, an in-line strainer
or mesh screen should be used to eliminate contaminants
from entering the water-to refrigerant heat exchanger.
An isolation valve, p/t plugs and automatic balancing
device are also recommended to separate the closed/open
loop from the mechanical device.

Installation

Drain Connection
An evaporator condensate drain connection is provided
on each unit.The condensate drain pan is factory installed
to drain condensate to the back side of the unit. It can be
converted to drain condensate out of the front of the unit
or through the base
To convert drain condensate out the front of the
unit:

A condensate drain line must be connected to the p-trap.
Pitch the drain lines at least 1/2-inch for every 10-feet of
horizontal run to assure proper condensate flow. Do not
allow the horizontal run to sag causing a possible doubletrap condition which could result in condensate backup
due to air lock.
Figure 20.

1. Remove the evaporator access panel and supply air
access panels.
2. Remove the support panel that the condensate drain
pan exits through.
3. Slide the condensate drain pan out of the unit and
rotate 180°.
4. Slide the condensate drain pan back into the unit, align
the drain with the grommeted opening in the rear
support panel and push until the coupling is seated in
the grommet.
5. Replace the front support panel by aligning the panel
with tabs in the raceway. Align the condensate drain
pan support in the grommeted hole as the panel is put
in place.
6. Replace the evaporator access panel and the supply air
access panels.
To convert drain condensate through the base of the
unit:
1. Remove the evaporator access panel and supply air
access panels.
2. Remove the support panel that the condensate drain
pan exits through.
3. Slide the condensate drain pan out of the unit.
4. Place on a level surface in the position it was removed
from the unit.
5. Remove the plug knockout in the bottom of the drain
pan to convert it to through the base drainage.
6. Plug the original condensate drain opening with a field
supplied 3/4-inch NPT plug.
7.

Slide the condensate drain pan back into the unit, align
the drain support with the grommeted opening in the
rear support panel and push until the support is seated
in the grommet.

8. Replace the front support panel by aligning the panel
with tabs in the raceway. Align the plugged condensate
drain pan coupling in the grommeted hole as the panel
is put in place.

Horizontal Discharge Conversion
Units are factory shipped in the downflow discharge
configuration, but can be field converted to a horizontal
discharge configuration. Some, but not all units require a
different thermal cut-out limit switch (which is wire tied
near the terminal block in the heater compartment) if the
horizontal discharge configuration is used.
The following units require a limit switch change out for
the horizontal discharge.The additional limit switch is
shipped attached to the blower housing.
If any of the units listed in the following list are installed in
the downflow discharge configuration, remove the wire
tiedTCO-A (located near the terminal block in the heater
compartment) and discard.

Conversion 3 through 5-Ton Units
To convert a unit from down flow to horizontal discharge,
1. Remove the return and supply duct covers.
2. Apply gasket to the supply duct cover as shown in
Figure 21, p. 32.
Figure 21.

Gasket Installation

9. Replace evaporator access panel and supply air access
panels.
10. A condensate trap must be installed at the unit due to
the drain connection being on the negative pressure
side of the fan. Install the p-trap using the guidelines
below.

WSHP-SVX12B-EN

Installation
3. Position duct covers. Rotate the supply duct cover 90degrees to allow it to be slid into the supply opening.
Figure 22. Duct cover with gasket installed

retaining angle and securing the other side with three
screws.
Note: If the unit is equipped with a return air smoke
detector, refer to the field conversion for horizontal
discharge before installing the return air duct
cover.
4. Slide return duct cover into supply openings until end
ward edge of the duct cover engages with the two
retaining clips on the duct flanges. Secure the outward
edge of each duct cover with two screws.
Note: If unit should include a limit switch change out,
proceed to theTCO-A instruction sheet on this
page.

TCO-A Instructions

Note: If the unit is equipped with a return air smoke
detector, refer to the field conversion for horizontal
discharge before installing the return air duct
cover.
4. Slide the duct covers into the duct openings until the
end ward edge of the duct cover engages with the two
retaining clips on the duct flanges. Secure the outward
edge of each duct cover with two screws.

If the unit being installed is listed in the following table,
and is equipped with the corresponding model number of
factory installed electric heater package in the table, the
limit controlTCO-A must be replace with the extra limit
control shipped in the heater compartment. ReplaceTCOA following the instruction in steps 1 through 4. If the unit
being installed does not have a factory installed electric
heater package, or is equipped with a factory installed
electric heater model that does not correspond to models
listed below, skip steps 1 through 4, and go on to the next
step in the installation process.

Note: If unit should include a limit switch change out,
proceed to theTCO-A instruction sheet on “TCO-A
Instructions,” p. 33.

Note: See Table 7, p. 40 for electric heater kit part #s and
equipment models.

Figure 23. Installing duct cover

1. Remove the heater section access panel and open the
electric heater front panel.
2. TCO-A is the limit control located in the central part of
the heater mounting plate and that is located on the
bottom of the two heater element assemblies.To
replace this device, first remove the two wires
connected to the terminals. Next, remove the two
screws which secure it to the heater element mounting
plate. OnceTCO-A has been removed from the heater
element mounting plate, discard this device.
3. Obtain the replacementTCO-A which is secured by a
wire tie near the electric heater terminal block in the
heater compartment. Attach it to the heater element
mounting plate with the two screws that were removed
in step 2 above. Connect the two wires that were
unhooked in step 2 to the terminals on the newTCO-A.
Refer to the heater package wiring diagram to assure
that the wiring is connected properly.

Conversion 6 through 10-Ton Units
To convert a unit from down flow to horizontal discharge,

4. Close the electric heater dead front panel and replace
heat section access panel.

1. Remove the return and supply duct covers.
2. Apply gasket to the return duct cover as shown in
Figure 22.
3. Position the duct covers as shown below.The supply
duct cover is installed over the down flow return
opening by engaging one side of the panel under a

WSHP-SVX12B-EN

Installation

Field Installed Power Wiring
WARNING
Proper Field Wiring and Grounding
Required!
All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field
wiring poses FIRE and ELECTROCUTION hazards. To
avoid these hazards, you MUST follow requirements for
field wiring installation and grounding as described in
NEC and your local/state electrical codes. Failure to
follow code could result in death or serious injury.
Verify that the power supply available is compatible with
the unit’s nameplate.The available supply power must be
within 10% of the rated voltage stamped on the nameplate.
Use only copper conductors to connect the power supply
to the unit.

Main Unit Power Wiring
1. If the unit is NOT equipped with an optional factory
installed non-fused disconnect switch or circuit
breaker, a field supplied disconnect switch must be
installed at or near the unit in accordance with the
National Electric Code (NEC latest edition).
2. Location of the applicable electric service entrance
may be found in Figure 24, p. 34.
3. Complete the unit’s power wiring connections onto
either; the main terminal wire connectors inside the
unit control panel, the factory mounted non-fused
disconnect switch (UCD) or circuit breaker (UCB). Refer
to the customer connection diagram that is shipped
with the unit for specific termination points.
4. Provide proper grounding for the unit in accordance
with the local and national codes.

Figure 24. Electrical entrance

Field Installed Control Wiring

Control Power Transformer

An overall layout of the various control options available
with the required number of conductors for each control
device may be found on Figure 25, p. 35 and Figure 26,
p. 36.

The 24-volt control power transformers are to be used only
with the accessories called out in this manual.
Transformers rated greater than 50 VA are equipped with
internal circuit breakers. If a circuit breaker trips, turn OFF
all power to the unit before attempting to reset it.

Note: All field wiring must conform to NEC guidelines as
well as state and local codes.

WSHP-SVX12B-EN

Installation

WARNING
Hazardous Voltage!

The transformer is located in the control panel.The circuit
breaker is located on the left side of the transformer and
can be reset by pressing in on the black reset button.

Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Failure to disconnect power
before servicing could result in death or serious injury.
Figure 25.

WSHP-SVX12B-EN

Installation

Figure 26.

WSHP-SVX12B-EN

Installation
Controls Using 24 VAC
Before installing any wire, refer to the electrical access
locations in Figure 24, p. 34.
1. Use copper conductors unless otherwise specified.
2. Ensure that the AC control wiring between the controls
and the unit’s termination point does not exceed three
(3) ohms/conductor for the length of the run.
Note: Resistance in excess of 3-ohms per conductor may
cause component failure due to insufficient AC
voltage supply.
3. Check all loads and conductors for grounds, shorts,
and mis-wiring.

Note: Resistance in excess of 2.5 ohms per conductor can
cause deviations in the accuracy of the controls.
2. Ensure that the wiring between controls and the unit’s
termination point does not exceed two and a half (2.5)
ohms/conductor for the length of the run.
3. Do not run the electrical wires transporting DC signals
in or around conduit housing high voltage wires.
4. Route low voltage wiring per Figure 27.
Table 5.

DC conductors; zone sensor module wiring

Distance from unit to Recommended Wire
Control
Size
0-150 feet

22 gauge

4. Do not run the AC low voltage wiring in the same
conduit with the high voltage power wiring.

151-240 feet

20 gauge

241-385 feet

18 gauge

5. Route low voltage wire per Figure 27 below.

386-610 feet

16 gauge

Figure 27.

611-970 feet

14 gauge

Table 4.

Wire Routing

24V AC conductors

Distance from unit Recommended Wire
to Control
Size
000-460 feet

18 gauge

461-732 feet

16 gauge

733-1000 feet

14 gauge

Controls using DC Analog Input/Outputs
(Standard Low Voltage Multi-conductor Wire)
Before installing any connecting wire between the unit
utilizing a DC analog input/output signal,
refer to Figure 24, p. 34 for electrical access locations
provided on the unit.
1. Review Table 5, it lists the conductor sizing guidelines
that must be followed when interconnecting the DC
binary output devices and the system components
utilizing a DC analog input/output signal to the unit.
WSHP-SVX12B-EN

Electrical Requirements
Table 6.

Model No.

GERE036

GERE048

GERE060

GERE072

GERE090

GERE120

Electrical perfomance

Unit Volts

Total
Comp
Comp
No. of
Unit FLA RLA (ea) LRA (ea) Compres.

Blower
Motor
FLA

Blower
Motor
HP

Fan
Motor
Num

Minimum
Circuit
Ampacity

Maximum
Overcurrent
Protective
Device
45

208/60/1

24.6

18.6

105.0

6.00

0.75

29.3

230/60/1

24.6

18.6

105.0

6.00

0.75

29.3

208/60/3

18.5

13.5

88.0

5.00

21.9

230/60/3

18.5

13.5

88.0

5.00

21.9

460/60/3

8.9

6.4

39.0

2.50

10.5

575/60/3

6.8

5.1

34.0

1.70

8.1

208/60/1

30.7

23.1

134.0

7.60

36.5

230/60/1

30.7

23.1

134.0

7.60

36.5

208/60/3

21.0

16.0

91.0

5.00

25.0

230/60/3

21.0

16.0

91.0

5.00

25.0

460/60/3

9.6

7.1

46.0

2.50

11.4

575/60/3

7.3

5.6

37.0

1.70

8.7

208/60/1

35.2

27.6

158.0

7.60

42.1

230/60/1

35.2

27.6

158.0

7.60

42.1

208/60/3

23.1

18.1

137.0

5.00

27.6

230/60/3

23.1

18.1

137.0

5.00

27.6

460/60/3

11.5

9.0

62.0

2.50

13.8

575/60/3

8.5

6.8

50.0

1.70

10.2

208/60/3

27.4

22.4

149.0

5.00

33.0

230/60/3

27.4

22.4

149.0

5.00

33.0

460/60/3

13.1

10.6

75.0

2.50

15.8

575/60/3

9.2

7.7

54.0

1.50

11.1

208/60/3

28.7

22.4

149.0

6.30

34.3

230/60/3

28.7

22.4

149.0

6.30

34.3

460/60/3

13.7

10.6

75.0

3.10

16.4

575/60/3

10.1

7.7

54.0

2.40

12.0

208/60/3

28.6

25.0

164.0

3.60

34.9

230/60/3

28.6

25.0

164.0

3.60

34.9

460/60/3

13.9

12.2

100.0

1.70

17.0

575/60/3

10.4

9.0

78.0

1.40

12.7

208/60/3

34.4

25.0

164.0

9.40

40.7

230/60/3

34.4

25.0

164.0

9.40

40.7

460/60/3

16.8

12.2

100.0

4.60

19.9

575/60/3

12.4

9.0

78.0

3.40

14.7

208/60/3

26.6

18.1

137.0

8.50

3.6

49.2

230/60/3

26.6

18.1

137.0

8.50

3.6

49.2

460/60/3

13.3

9.0

62.0

4.30

3.6

24.6

575/60/3

11.1

6.8

50.0

4.30

3.6

19.6

WSHP-SVX12B-EN

Electrical Requirements
Table 6.

Model No.

GERE150

GERE180

GERE240

GERE300

Electrical perfomance

Unit Volts

Blower
Motor
FLA

Blower
Motor
HP

Fan
Motor
Num

Minimum
Circuit
Ampacity

Maximum
Overcurrent
Protective
Device

10.60

61.0

Total
Comp
Comp
No. of
Unit FLA RLA (ea) LRA (ea) Compres.

208/60/3

33.0

22.4

149.0

230/60/3

33.0

22.4

149.0

10.60

61.0

460/60/3

15.4

10.6

75.0

4.80

28.7

575/60/3

11.8

7.9

54.0

3.90

21.7

208/60/3

39.1

22.4

149.0

16.70

67.1

230/60/3

39.1

22.4

149.0

16.70

67.1

460/60/3

18.2

10.6

75.0

7.60

31.5

575/60/3

14.0

7.9

54.0

6.10

23.9

208/60/3

35.6

25.0

164.0

10.60

66.9

230/60/3

35.6

25.0

164.0

10.60

66.9

460/60/3

17.3

12.5

100.0

4.80

32.9

575/60/3

14.2

10.3

78.0

3.90

27.1

208/60/3

41.7

25.0

164.0

16.70

73.0

230/60/3

41.7

25.0

164.0

16.70

73.0

460/60/3

20.1

12.5

100.0

7.60

35.7

575/60/3

16.4

10.3

78.0

6.10

29.3

208/60/3

55.8

39.1

267.0

16.70

104.7

125

230/60/3

55.8

39.1

267.0

16.70

104.7

125

460/60/3

24.9

17.3

142.0

7.60

46.5

575/60/3

21.5

15.4

103.0

6.10

40.8

208/60/3

56.7

39.1

267.0

17.60

7.5

105.6

125

230/60/3

56.7

39.1

267.0

17.60

7.5

105.6

125

460/60/3

25.9

17.3

142.0

8.60

7.5

47.5

575/60/3

22.4

15.4

103.0

7.00

7.5

41.7

208/60/3

63.3

39.1

267.0

24.20

7.5

112.2

150

230/60/3

63.3

39.1

267.0

24.20

7.5

112.2

150

460/60/3

29.6

18.6

103.0

11.00

7.5

52.9

575/60/3

24.4

15.4

160.0

9.00

7.5

43.7

WSHP-SVX12B-EN

Electrical Requirements
Table 7.

Electrical Perfomance for units with electric heat (single point connection)
Standard Indoor Motor

Unit Model
Number

Heater Model
Number

Electric Heat Electric Heat
Amps
kW

Control
Stages

Mimimum
Circuit
Ampacity

208 Volt Single Phase
GERE036

GERE048

GERE060

Oversized Indoor Motor

Max
Mimimum
Max
Overcurrent
Circuit
Overcurren
Protection Ampacity t Protection
—

—

BAYHTRE105*

18.3

3.8

52.1

—

BAYHTRE110*

36.1

7.5

74.4

—

BAYHTRE114*

50.0

10.4

91.8

100

—

BAYHTRE105*

18.3

3.8

59.4

—

BAYHTRE110*

36.1

7.5

81.6

—

BAYHTRE114*

50.0

10.4

99.0

100

—

BAYHTRE118*

63.5

13.2

115.9

125

—

BAYHTRE105*

18.3

3.8

65.0

—

BAYHTRE110*

36.1

7.5

87.2

100

—

BAYHTRE114*

50.0

10.4

104.6

110

—

BAYHTRE118*

63.5

13.2

121.5

125

—

230 Volt Single Phase
GERE036

GERE048

GERE060

BAYHTRE105*

20.8

5.0

55.3

—

BAYHTRE110*

41.7

10.0

81.4

—

BAYHTRE114*

57.5

13.8

101.1

110

—

BAYHTRE105*

20.8

5.0

62.5

—

BAYHTRE110*

41.7

10.0

88.6

100

—

BAYHTRE114*

57.5

13.8

108.4

110

—

BAYHTRE118*

73.3

17.6

128.1

150

—

BAYHTRE105*

20.8

5.0

68.1

—

BAYHTRE110*

41.7

10.0

94.2

110

—

BAYHTRE114*

57.5

13.8

114.0

125

—

BAYHTRE118*

73.3

17.6

133.7

150

—

BAYHTRE306*

12.5

4.5

37.5

—

BAYHTRE312*

25.0

9.0

53.1

—

BAYHTRE318*

36.4

13.1

67.4

—

BAYHTRE306*

12.5

4.5

40.6

—

BAYHTRE312*

25.0

9.0

56.3

—

BAYHTRE318*

36.4

13.1

70.5

—

BAYHTRE306*

12.5

4.5

43.3

—

BAYHTRE312*

25.0

9.0

58.9

—

BAYHTRE318*

36.4

13.1

73.1

—

BAYHTRX323*

48.0

17.3

87.6

—

BAYHTRW309A

6.8

18.9

56.6

57.9

BAYHTRW318A

13.5

37.5

79.9

81.2

BAYHTRW327A

20.3

56.3

103.4

110

104.7

110

BAYHTRW336A

27.0

74.9

126.6

150

127.9

150

BAYHTRU309A

6.8

18.9

58.4

64.2

BAYHTRU318A

13.5

37.5

81.7

87.5

100

BAYHTRU327A

20.3

56.3

105.3

110

111.1

125

BAYHTRU336A

27.0

74.9

128.5

150

134.3

150

208 Volt Three Phase
GERE036

GERE048

GERE060

GERE072

GERE090

WSHP-SVX12B-EN

Electrical Requirements
Table 7.

Electrical Perfomance for units with electric heat (single point connection)
Standard Indoor Motor

Unit Model
Number

GERE120

GERE150

GERE180

GERE240

GERE300

Heater Model
Number

Electric Heat Electric Heat
Amps
kW

Control
Stages

Mimimum
Circuit
Ampacity

Oversized Indoor Motor

Max
Mimimum
Max
Overcurrent
Circuit
Overcurren
Protection Ampacity t Protection

BAYHTRB318A

13.5

37.5

96.1

100

—

BAYHTRB327A

20.3

56.3

119.7

125

—

BAYHTRB336A

27.0

74.9

142.9

150

—

BAYHTRB354A

40.6

112.7

190.1

200

—

AYDHTRK318/
AYHHTRM318

37.5

13.5

107.9

110

114.0

125

AYDHTRK336/
AYHHTRM336

74.9

27.0

154.6

175

160.7

175

AYDHTRK354/
AYHHTRM354

112.4

40.5

201.5

225

207.6

225

AYDHTRK318/
AYHHTRM318

37.5

13.5

113.7

125

119.8

125

AYDHTRK336/
AYHHTRM336

74.9

27.0

160.5

175

166.6

175

AYDHTRK354/
AYHHTRM354

112.4

40.5

207.4

225

213.5

225

AYDHTRL336/
AYHHTRN336

74.9

27.0

198.3

200

199.2

200

AYDHTRL354/
AYHHTRN354

112.4

40.5

245.2

250

246.1

250

AYDHTRK372/
AYHHTRN372

149.9

54.0

292.1

300

293.0

300

AYDHTRL336/
AYHHTRN336

74.9

27.0

205.8

225

—

AYDHTRL354/
AYHHTRN354

112.4

40.5

252.7

300

—

AYDHTRK372/
AYHHTRN372

149.9

54.0

299.6

300

—

BAYHTRE306*

14.4

6.0

39.9

—

BAYHTRE312*

28.9

12.0

58.0

—

BAYHTRE318*

41.9

17.4

74.3

—

BAYHTRE306*

14.4

6.0

43.0

—

BAYHTRE312*

28.9

12.0

61.1

—

BAYHTRE318*

41.9

17.4

77.4

—

BAYHTRE306*

14.4

6.0

45.6

—

BAYHTRE312*

28.9

12.0

63.8

—

BAYHTRE318*

41.9

17.4

80.0

—

230 Volt Three Phase
GERE036

GERE048

GERE060

GERE072

GERE090

BAYHTRX323*

55.3

23.0

96.8

100

—

BAYHTRW309A

9.0

21.7

60.1

61.4

BAYHTRW318A

18.0

43.3

87.1

88.4

100

BAYHTRW327A

27.0

65.0

114.2

125

115.5

125

BAYHTRW336A

36.0

86.6

141.3

150

142.6

150

BAYHTRU309A

9.0

21.7

61.9

67.7

BAYHTRU318A

18.0

43.3

89.0

100

94.8

100

BAYHTRU327A

27.0

65.0

116.0

125

121.8

125

BAYHTRU336A

36.0

86.6

143.1

150

148.9

150

WSHP-SVX12B-EN

Electrical Requirements
Table 7.

Electrical Perfomance for units with electric heat (single point connection)
Standard Indoor Motor

Unit Model
Number

GERE120

GERE150

GERE180

GERE240

GERE300

Heater Model
Number

Electric Heat Electric Heat
Amps
kW

Control
Stages

Mimimum
Circuit
Ampacity

Oversized Indoor Motor

Max
Mimimum
Max
Overcurrent
Circuit
Overcurren
Protection Ampacity t Protection

BAYHTRB318A

18.0

43.3

103.4

110

—

BAYHTRB327A

27.0

65.0

130.4

150

—

BAYHTRB336A

36.0

86.6

157.5

175

—

BAYHTRB354A

54.0

129.9

211.6

225

—

AYDHTRK318/
AYHHTRM318

43.3

18.0

115.1

125

121.2

125

AYDHTRK336/
AYHHTRM336

86.6

36.0

169.3

175

175.4

200

AYDHTRK354/
AYHHTRM354

129.9

54.0

223.4

225

229.5

250

AYDHTRK318/
AYHHTRM318

43.3

18.0

121.0

125

127.1

150

AYDHTRK336/
AYHHTRM336

86.6

36.0

175.1

200

181.2

200

AYDHTRK354/
AYHHTRM354

129.9

54.0

229.2

250

235.3

250

AYDHTRL336/
AYHHTRN336

86.6

36.0

212.9

225

213.8

225

AYDHTRL354/
AYHHTRN354

129.9

54.0

267.1

300

268.0

300

AYDHTRK372/
AYHHTRN372

173.2

72.0

321.2

300

322.1

300

AYDHTRL336/
AYHHTRN336

86.6

36.0

220.4

225

—

AYDHTRL354/
AYHHTRN354

129.9

54.0

274.6

300

—

AYDHTRK372/
AYHHTRN372

173.2

72.0

328.7

300

—

BAYHTRE406*

7.2

6.0

19.5

—

BAYHTRE412*

14.4

12.0

28.5

—

BAYHTRE418*

20.9

17.4

36.6

—

BAYHTRE406*

7.2

6.0

20.4

—

BAYHTRE412*

14.4

12.0

29.4

—

BAYHTRE418*

20.9

17.4

37.5

—

BAYHTRE406*

7.2

6.0

22.8

—

BAYHTRE412*

14.4

12.0

31.8

—

BAYHTRE418*

20.9

17.4

39.9

—

460 Volt Three Phase
GERE036

GERE048

GERE060

GERE072

GERE090

BAYHTRX423*

27.7

23.0

48.4

—

BAYHTRW409A

9.0

10.8

29.3

29.9

BAYHTRW418A

18.0

21.7

42.8

43.4

BAYHTRW427A

27.0

32.5

56.3

56.9

BAYHTRW436A

36.0

43.3

69.9

70.5

BAYHTRU409A

9.0

10.8

30.5

33.4

BAYHTRU418A

18.0

21.7

44.0

46.9

BAYHTRU427A

27.0

32.5

57.5

60.4

BAYHTRU436A

36.0

43.3

71.1

74.0

WSHP-SVX12B-EN

Electrical Requirements
Table 7.

Electrical Perfomance for units with electric heat (single point connection)
Standard Indoor Motor

Unit Model
Number

GERE120

GERE150

GERE180

GERE240

GERE300

Heater Model
Number

Electric Heat Electric Heat
Amps
kW

Control
Stages

Mimimum
Circuit
Ampacity

Oversized Indoor Motor

Max
Mimimum
Max
Overcurrent
Circuit
Overcurren
Protection Ampacity t Protection

BAYHTRB418A

18.0

21.7

51.6

—

BAYHTRB427A

27.0

32.5

65.1

—

BAYHTRB436A

36.0

43.3

78.7

—

BAYHTRB454A

54.0

65.0

105.7

110

—

AYDHTRK418/
AYHHTRM418

21.7

18.0

55.8

58.6

AYDHTRK436/
AYHHTRP436

43.3

36.0

82.8

85.6

AYDHTRK454/
AYHHTRM454

65.0

54.0

109.9

110

112.7

125

AYDHTRK418/
AYHHTRM418

21.7

18.0

60.1

62.9

AYDHTRK436/
AYHHTRP436

43.3

36.0

87.1

89.9

AYDHTRK454/
AYHHTRM454

65.0

54.0

114.2

125

117.0

125

AYDHTRL436/
AYHHTRN436

43.3

36.0

100.7

110

101.7

110

AYDHTRL454/
AYHHTRN454

65.0

54.0

127.8

150

128.8

150

AYDHTRK472/
AYHHTRN472

86.6

72.0

154.8

175

155.8

175

AYDHTRL436/
AYHHTRN436

43.3

36.0

107.0

110

—

AYDHTRL454/
AYHHTRN454

65.0

54.0

134.1

150

—

AYDHTRK472/
AYHHTRN472

86.6

72.0

161.1

175

—

BAYHTREW06*

5.8

6.0

15.3

—

BAYHTREW12*

11.5

12.0

22.5

—

BAYHTREW18*

16.7

17.4

29.0

—

BAYHTREW06*

5.8

6.0

16.0

—

BAYHTREW12*

11.5

12.0

23.1

—

BAYHTREW18*

16.7

17.4

29.6

—

BAYHTREW06*

5.8

6.0

17.5

—

BAYHTREW12*

11.5

12.0

24.6

—

BAYHTREW18*

16.7

17.4

31.1

—

575 Volt Three Phase
GERE036

GERE048

GERE060

GERE072

GERE090

GERE120

BAYHTRXW23*

22.1

23.0

37.8

—

BAYHTRWW18A

18.0

17.3

32.8

33.7

BAYHTRWW27A

27.0

26.0

43.6

44.5

BAYHTRWW36A

36.0

34.6

54.4

55.3

BAYHTRUW18A

18.0

17.3

34.3

36.3

BAYHTRUW27A

27.0

26.0

45.1

47.1

BAYHTRUW36A

36.0

34.6

56.0

58.0

BAYHTRBW18A

18.0

17.3

41.2

—

BAYHTRBW36A

36.0

34.6

62.9

—

BAYHTRBW54A

54.0

52.0

84.6

—

WSHP-SVX12B-EN

Electrical Requirements
Table 7.

Electrical Perfomance for units with electric heat (single point connection)
Standard Indoor Motor

Unit Model
Number

GERE150

GERE180

GERE240

GERE300

Heater Model
Number

Electric Heat Electric Heat
Amps
kW

Control
Stages

Mimimum
Circuit
Ampacity

Oversized Indoor Motor

Max
Mimimum
Max
Overcurrent
Circuit
Overcurren
Protection Ampacity t Protection

AYDHTRKW18/
AYHHTRMW18

17.3

18.0

43.3

45.5

AYDHTRKW36/
AYHHTRMW36

34.6

36.0

64.9

67.1

AYDHTRKW54/
AYHHTRMW54

52.0

54.0

86.7

88.9

AYDHTRKW18/
AYHHTRMW18

17.3

18.0

48.7

50.9

AYDHTRKW36/
AYHHTRMW36

34.6

36.0

70.3

72.5

AYDHTRKW54/
AYHHTRMW54

52.0

54.0

92.1

100

94.3

100

AYDHTRLW36/
AYHHTRNW36

34.6

36.0

84.0

84.9

AYDHTRLW54/
AYHHTRNW54

52.0

54.0

105.8

110

106.7

110

AYDHTRKW72/
AYHHTRNW72

69.3

72.0

127.4

150

128.3

150

AYDHTRMW36/
AYHHTRMW36

34.6

36.0

86.9

—

AYDHTRLW54/
AYHHTRNW54

52.0

54.0

108.7

110

—

AYDHTRKW72/
AYHHTRNW72

69.3

72.0

130.3

150

—

WSHP-SVX12B-EN

Pre-Start
Space Temperature Averaging
Space temperature averaging is accomplished by wiring a
number of remote sensors in a series/parallel circuit.

Example #1 illustrates two series circuits with two sensors
in each circuit wired in parallel.The square of any number
of remote sensors require.

Using the BAYSENS016* or BAYSENS017*, at least four
sensors are required to accomplish space temperature
averaging.
Figure 28. Example 1
ZSM

REMOTE SENSORS
#1

REMOTE SENSOR
#2

REMOTE SENSOR
#3

REMOTE SENSOR
#4

1
1

REMOTE SENSOR
#1

ZSM
TERMINAL
#1

ZSM
TERMINAL
#2

Example #2 illustrates three sensors squared in a series/
parallel circuit. Using BAYSENS032*, two sensors are
required to accomplish space temperature averaging.
Figure 29. Example 2
ZSM

REMOTE SENSORS
#2

1
2

REMOTE
SENSOR
#2

REMOTE
SENSOR
#3

REMOTE
SENSOR
#4

REMOTE
SENSOR
#5

REMOTE
SENSOR
#6

REMOTE
SENSOR
#7

REMOTE
SENSOR
#8

REMOTE
SENSOR
#9

REMOTE
SENSOR
#1

#6
ZSM
TERMINAL
#1

ZSM
TERMINAL
#2

Example #3 illustrates the circuit required for this sensor.
Figure 30. Example 3
ZSM

REMOTE SENSORS
#1

1
2

ZSM
TERMINAL
#1

WSHP-SVX12B-EN

ZSM
TERMINAL
#2

Pre-Start
Table 8 lists the temperature versus resistance coefficient
for all sensors.
Table 8.

Temp vs. Resistance

V1, V2, V3 = Line Voltage Readings
VD = Line Voltage reading that deviates the farthest from
the average voltage.
Example: If the voltage readings of the supply power
measured 221, 230 and 227, the average volts would be:

Degrees
F

Nominal
Resistance
K-Ohms

Degrees
F

Nominal
Resistance
K-Ohms

-20

170.1

22.85

-15

143.5

19.96

-10

121.4

17.47

VD (reading farthest from average) = 221

-5

103.0

15.33

The percentage of Imbalance equals:

87.56

13.49

74.65

11.89

63.80

10.50

54.66

9.297

46.94

8.247

40.40

7.330

34.85

6.528

30.18

100

5.824

26.22

*Temperature vs. resistance coefficient is negative

221+230+227
3

100 x

= 226 Avg.

226 - 221
226

= 2.2%

The 2.2% imbalance in this example exceeds the
maximum allowable imbalance of 2.0%.This much
imbalance between phases can equal as much as a 20%
current imbalance with a resulting increase in motor
winding temperatures that will decrease motor life. If the
voltage imbalance is over 2%, notify the proper agencies
to correct the voltage problem before operating this
equipment.

Electrical Phasing (Three Phase Motors)

Voltage Imbalance

The compressor motor(s) and the supply fan motor are
internally connected for the proper rotation when the
incoming power supply is phased as A, B, C.
Proper electrical supply phasing can be quickly
determined and corrected before starting the unit by an
instrument such as an Associated Research Model 45
Phase Sequence Indicator and following the steps below:

WARNING
Hazardous Voltage!
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Failure to disconnect power
before servicing could result in death or serious injury.
1. Turn the field supplied disconnect switch that provides
power to the main power terminal block or to the Line
side of the optional factory mounted disconnect switch
to the OFF position.
2. Connect the phase sequence indicator leads to the
terminal block or the Line side of the optional factory
mounted disconnect switch as follows:
Black (phase A) to L1

% Voltage Imbalance =

100 x AV - VD
AV

Yellow (phase C) to L3

where;
AV (average voltage) =

Red (phase B) to L2

Volt 1 + Volt 2 + Volt 3
3

3. Close the field supplied main power disconnect switch
or circuit protector switch that provides the supply
power to the unit.
4. Observe the ABC and CBA phase indicator lights on the
face of the sequencer.The ABC indicator light will glow

WSHP-SVX12B-EN

Pre-Start
if the phase is ABC. If the CBA indicator light glows,
open the disconnect switch or circuit protection switch
and reverse any two power wires.
5. Restore the main electrical power and recheck the
phasing. If the phasing is correct, open the disconnect
switch or circuit protection switch and remove the
phase sequence indicator.

Compressor Crankcase Heaters (Optional)
Each compressor can be equipped with a crankcase
heater.The proper operation of the crankcase heater is
important to maintain an elevated compressor oil
temperature during the OFF cycle to reduce oil foaming
during compressor starts. Oil foaming occurs when
refrigerant condenses in the compressor and mixes with
the oil. In lower ambient conditions, refrigerant migration
to the compressor could increase.
When the compressor starts, the sudden reduction in
crankcase pressure causes the liquid refrigerant to boil
rapidly causing the oil to foam.This condition could
damage compressor bearings due to reduced lubrication
and could cause compressor mechanical failures.
Before starting the unit in the COOLING mode, set the
system switch to the OFF position and turn the main power
disconnect to the ON position and allow the crankcase
heater to operate a minimum of 8-hours.

shorting across the two test terminals for two or three
seconds.
For the initial start-up of the unit, this method initiates the
different components of the unit, one at a time, by
temporarily shorting across the two test terminals for two
or three seconds.

Resistance Test Mode: This method may be used for
start-up providing a decade box for variable resistance
outputs.This method initiates the different components of
the unit, one at a time, when a specific resistance value is
placed across the two test terminals.The unit will remain
in the specific test mode for approximately one hour even
though the resistance is left on the test terminals.
Auto Test Mode: This method is not recommended for
start-up due to the short timing between individual
component steps.This method initiates the different
components of the unit, one at a time, when a jumper is
installed across the test terminals.The unit will start the
first test step and change to the next step every 30
seconds. At the end of the test mode, control of the unit
will automatically revert to the applied SYSTEM control
method.
For unit test steps, test modes and step resistance values
to cycle the various components, see Table 9.

Before closing the main power disconnect switch, ensure
that the SYSTEM selection switch is in the OFF position
and the FAN selection switch is in the AUTO position.
Close the main power disconnect switch and the unit
mounted disconnect switch, if applicable.
Upon power initialization, the RTRM performs selfdiagnostic checks to ensure that all internal controls are
functional. It also checks the configuration parameters
against the components connected to the system.The
Liteport LED, located on the RTRM module, is turned ON
within one second of power-up if internal operation is
okay.
Use one of the followingTEST procedures to bypass some
time delays and to start the unit at the control panel. Each
step of unit operation can be activated individually by
temporarily shorting across theTEST terminals for two or
three seconds.The Liteport LED will blink when the test
mode has been initiated.The unit can be left in anyTEST
step for up to one hour before it will automatically
terminate, or it can be terminated by opening the main
power disconnect switch. Once the test mode has been
terminated, the Liteport LED will glow continuously and
the unit will revert to the SYSTEM control.

Test Modes
There are three methods in which theTEST mode may be
cycled at LTB-Test 1 and LTB-Test 2.

Step Test Mode: This method initiates the different
components of the unit, one at a time, by temporarily
WSHP-SVX12B-EN

Pre-Start
Table 9.
Test Step

Service Test Guide
Mode

Fan

Econ
(Note 2)

Compr 1

Compr 2

Heat 1 Heat 2

OFF

Ohms

Fan

Min Position
Setpoint 0%

Min Ventilation

Selectable

OFF

EconomizerTest
Open

OPEN

OFF

3.3K

CoolStage-1

Min Position

ON(Note 1)

OFF

4.7K

4(Note 3)

CoolStage-2

Min Position

ON(Note 1)

ON (Note 1)

OFF

6.8K

5(Note 3)

Heat Stage-1

Min

OFF

10K

6(Note 3)

HeatStage-2

Min

OFF

15K

2.2K

Notes:
1. The condenser fans will operate any time a compressor is ON providing the outdoor temperatures are within the
operating values.
2. The exhaust fan will turn on anytime the economizer damper position is equal to or greater than the exhaust fan
setpoint.
3. Steps for optional accessories and non-applicable modes in unit will be skipped.

Verifying Proper Air Flow (Units with DD
Indoor Fan)

Note: Static pressure is based on desired CFM and may
not be actual static pressure.

Much of the systems performance and reliability is closely
associated with, and dependent upon having the proper
airflow supplied both to the space that is being
conditioned and across the evaporator coil.

3. Add the total accessory static pressure drop (Step 2) to
the duct external static pressure (Step 1).The sum of
these two values represents the total system external
static pressure.

The fan motor is factory wired to operate on low speed in
the cooling and heating mode. It can be rewired for high
speed operation should the application require it. Refer to
the wiring diagram on the unit.
The fan motor is specifically designed to operate within
the Blower Horse Power (BHP) parameters listed in the fan
performance tables of the unit Service Facts. By
understanding that these motors will safely work within
these conditions, before an oversized motor is required,
will allow the air distribution system to be set up properly
and diagnostics enhanced should a problem occur.
When verifying direct drive fan performance, the tables
must be used somewhat differently than those of belt
driven fans. Fan performance diagnostics can be easily
recognized when these tables are used correctly.
Before starting the SERVICETEST, set the minimum
position setpoint for the economizer to 0% using the
setpoint potentiometer located on the Economizer Control
(ECA), if applicable.
Using Table 9, momentarily jump across theTest 1 and
Test 2 terminals on LTB1 one time to start the minimum
ventilation test.
With the fan operating properly, determine the total
system external static pressure (inches w.c.) by:
1. Measuring the supply and return duct static pressure.
2. Using the accessory pressure drop table in the Service
Facts, calculate the total static pressure drop for all of
the accessories installed on the unit; (i.e. curb,
economizer, etc.)

b. Using the fan performance tables in the unit Service
Facts, plot the total external static pressure (Step 3)
and the BHP (Step 4a) to obtain the operating CFM.
When plotted, if the two values can not be interpolated
correspondingly, the static pressure will most likely be
the least accurate measurement. Because of the direct
drive motor operation, the RPM performance is
relatively constant making the operating current a very
reliable diagnostic tool.
Example: GERE060 single phase, low speed
Actual Motor Amp (5.25)
Motor Nameplate Amps (5.3)

= 99%

WSHP-SVX12B-EN

Pre-Start
0.99 x Motor HP (0.6) = .59 BHP
The actual external static pressure is approximately
0.45" w.c., airflow equals 2100 CFM.

WARNING
Live Electrical Components!

If the static pressure reading was higher, motor current
would have to be lower proportionately to get an
accurate CFM measurement in direct drive
applications.

During installation, testing, servicing and
troubleshooting of this product, it may be necessary to
work with live electrical components. Have a qualified
licensed electrician or other individual who has been
properly trained in handling live electrical components
perform these tasks. Failure to follow all electrical
safety precautions when exposed to live electrical
components could result in death or serious injury.

5. If the required CFM is too low, (external static pressure
is high causing motor HP output to be below table
value),
a. Relieve supply and/or return duct static.
b. Change indoor fan speed to HIGH and repeat steps
1 through 4.
6. If the required CFM is too high, (external static
pressure is low causing motor HP output to be above
table value), increase supply and/or return duct static.
7. To stop the SERVICETEST, turn the main power
disconnect switch to the OFF position or proceed to the
next component start-up procedure.

Verifying Proper Air Flow (Units with Belt
Drive Fan)
Much of the systems performance and reliability is closely
associated with, and dependent upon having the proper
airflow supplied both to the space that is being
conditioned and across the evaporator coil.
The fan speed is changed by opening or closing the
adjustable motor sheave.
Before starting the SERVICETEST, set the minimum
position setpoint for the economizer to 0% using the
setpoint potentiometer located on the Economizer Control
(ECA), if applicable.
Using Table 9, p. 48, momentarily jump across theTest 1
andTest 2 terminals on LTB1 one time to start the
minimum ventilation test.

WARNING
Rotating Components!
During installation, testing, servicing and
troubleshooting of this product it may be necessary to
measure the speed of rotating components. Have a
qualified or licensed service individual who has been
properly trained in handling exposed rotating
components perform these tasks. Failure to follow all
safety precautions when exposed to rotating
components could result in death or serious injury.

2. Measure the amperage at the supply fan contactor and
compare it with the full load amp (FLA) rating printed
on the motor nameplate.
a. Calculate the theoretical BHP.
Actual Motor Amps x Motor HP
Motor Nameplate Amps

b. Using the fan performance tables in the unit Service
Facts, plot the total external static pressure (Step 1)
and the BHP (Step 2) to obtain the operating CFM.
3. If the required CFM is too low, (external static pressure
is high causing motor HP output to be below table
value),
a. Relieve supply and/or return duct static.
b. Change fan speed and repeat steps 1 and 2.
4. To increase fan RPM; Loosen the pulley adjustment set
screw and turn sheave clockwise.
5. To decrease fan RPM; Loosen the pulley adjustment set
screw ant turn sheave counterclockwise.
6. If the required CFM is too high, (external static
pressure is low causing motor HP output to be above
table value), change fan speed and repeat steps 1 and
2.
7. To stop the SERVICETEST, turn the main power
disconnect switch to the OFF position or proceed to the
next component start-up procedure.

Fan Belt Adjustment (Units with Belt Drive
Fan)
The fan belts must be inspected periodically to assure
proper unit operation.
Replacement is necessary if the belts appear frayed or
worn. Units with dual belts require a matched set of belts
to ensure equal belt length.

Once the supply fan has started, check for proper rotation.
The direction of rotation is indicated by an arrow on the fan
housing. With the fan operating properly, determine the
total system airflow (CFM) by;
1. Measuring the actual RPM

WSHP-SVX12B-EN

Pre-Start

WARNING
Rotating Components!

Figure 31.

Belt tension gauge

During installation, testing, servicing and
troubleshooting of this product it may be necessary to
measure the speed of rotating components. Have a
qualified or licensed service individual who has been
properly trained in handling exposed rotating
components perform these tasks. Failure to follow all
safety precautions when exposed to rotating
components could result in death or serious injury.
When moving or installing the new belts, do not stretch
them over the sheaves. Loosen the belts using the belt
tension adjustment bolts on the motor mounting base.
Once the new belts are installed, using a Browning™ or
Gates™ tension gauge (or equivalent) illustrated in
Figure 31; adjust the belt tension as follows:

Table 10.

1. To determine the appropriate belt deflection;
a. Measure the center-to-center shaft distance (in
inches) between the fan and motor sheaves.
b. Divide the distance measure in Step 1a by 64; the
resulting value represents the amount of belt
deflection that corresponds to the proper belt
tension.
2. Set the large O-ring on the belt tension gauge at the
deflection value determined in Step 1b.

Belt tension measurement an deflection
ranges

Belts Cross Section
Small P.D. Range

Super Gripbelts

3.0 - 3.6

3.4 - 4.2

3.8 - 4.8

4.4 - 5.6

5.0 - 7.0

5.8 - 8.8

Min

Max

4.5

5.5

Min

3.5

5.125

Max

7.125

3. Set the small O-ring at zero on the force scale of the
gauge plunger.

Min

6.375

Max

5.5

8.75

4. Place the large end of the gauge at the center of the belt
span; then depress the gauge plunger until the large Oring is even with the top of the next belt or even with
the straightedge placed across the fan and motor
sheaves.

Min

3.875

5.75

Gripnotch

5. Remove the belt tension gauge.The small O-ring now
indicates a number other than zero on the plunger’s
force scale.This number represents the force (in
pounds) required to give the needed deflection.
6. Compare the "force" scale reading (Step 5) with the
appropriate "force" value listed in Table 10. If the
"force" reading is outside the range, readjust the belt
tension.
Note: Actual belt deflection "force" must not exceed the
maximum force value shown in Table 10.
7.

Recheck the belt tension at least twice during the first
2 to 3-days of operation. Belt tension may decrease
until the new belts are "run-in".

Steel Cable
Gripbelts

Max

5.5

Min

4.5

6.5

Max

6.25

9.125

Min

7.375

Max

6.875

10.125

Min

3.25

4.5

Max

5.5

Min

3.75

5.75

Max

4.75

7.25

Min

4.25

Max

5.25

8.75

Return Air Smoke Detector
The return air smoke detector is designed to shut off the
unit if smoke is sensed in the return air stream. Sampling
the airflow entering the unit at the return air opening
performs this function.
In order for the smoke detector to properly sense smoke in
the return air stream, the air velocity entering the unit must
be between 500 and 4000 feet per minute. Equipment
covered in this manual will develop an airflow velocity that
falls within these limits over the entire airflow range
specified in the fan performance tables.

WSHP-SVX12B-EN

Pre-Start
There are certain models however, if operated at low
airflow, will not develop an airflow velocity that falls within
the required 500 to 4000 feet per minute range. For these
models, the design airflow shall be greater than or equal
to the minimum CFM specified in W_C-IOM-1B manual.
Failure to follow these instructions will prevent the smoke
detector from performing its design function.

1. Attach a set of service gauges onto the suction and
discharge gauge ports for each circuit. Refer to the
refrigerant circuit illustration in the Service Facts.

Economizer Start-Up

3. Scroll Compressors

Using Table 9, p. 48 momentarily jump across theTest 1
andTest 2 terminals on LTB1 one time to start the
minimum ventilation test.
1. Set the minimum position setpoint for the economizer
to the required percentage of minimum ventilation
using the setpoint potentiometer located on the
Economizer Control (ECA).
The economizer will drive to its minimum position
setpoint, exhaust fans (if applicable) may start at
random, and the supply fan will start when the
SERVICETEST is initiated.

WARNING
Unexpected Fan Start Up!
The supply fan will start when Service Test is initiated
and the exhaust fan may start at random. The exhaust
fan will start anytime the economizer damper position
is equal to or greater than the exhaust fan setpoint.
Leave all access panels and guards to fan sections in
place when performing minimum ventilation test.
Failure to follow proper procedure could result in death
or serious injury.
The exhaust fan will start anytime the economizer
damper position is equal to or greater than the exhaust
fan setpoint.
2. Verify that the dampers stroked to the minimum
position.
3. Verify ambient sesor has been mouted into inside
corner post grommet.

ReliaTel Control
1. Momentarily jump across theTest 1 andTest 2
terminals on LTB1 one additional time if continuing
from previous component start-up or until the desired
start-up component test is started.
2. Verify that the dampers stroked to the full open
position.
3. To stop the SERVICETEST, turn the main power
disconnect switch to the OFF position or proceed to the
next component start-up procedure.

Compressor Start-Up
Using the service test guide in Table 9, p. 48, continue the
SERVICETEST start-up procedure for each compressor
circuit.

WSHP-SVX12B-EN

2. Momentarily jump across theTest 1 andTest 2
terminals on the LTB one additional time if continuing
from previous component start-up or until the desired
start-up componentTest is started.
a. Once each compressor has started, verify that the
rotation is correct. If a scroll compressor is rotating
backwards, it will not pump and a loud rattling
sound can be observed.

WARNING
Live Electrical Components!
During installation, testing, servicing and
troubleshooting of this product, it may be necessary to
work with live electrical components. Have a qualified
licensed electrician or other individual who has been
properly trained in handling live electrical components
perform these tasks. Failure to follow all electrical
safety precautions when exposed to live electrical
components could result in death or serious injury.
b. If the electrical phasing is correct, before
condemning a compressor, interchange any two
leads (at the compressorTerminal block) to check
the internal phasing. Refer to p. 47 for phase
sequencing. If the compressor runs backward for an
extended period (15 to 30 minutes), the motor
winding can overheat and cause the motor winding
thermostat to open.
c. Check the compressor oil levels.The oil lever in
each compressor sight glass should be 1/2 to 3/4 full
when they are OFF.
Note: The scroll compressor usesTrane OIL-42 without
substitution.The appropriate oil charge for a 9 and
10-ton scroll compressor is 8-pints. For a 14 and 15ton scroll compressor, use 14 pints.
4. After the compressor and condenser fan have started
and operated for approximately 30-minutes, observe
the operating pressures. Compare the operating
pressures to the operating pressure curve in the
Service Facts.
5. Check system superheat. Follow the instruction list on
the superheat charging curve in the Service Facts.
Note: Superheat should be within ±5° F of the superheat
chart value.
6. Repeat steps 1 through 4 for each refrigerant circuit.
7. To stop the SERVICETEST, turn the main power
disconnect switch to the OFF position or proceed to the
next component start-up procedure.

Pre-Start
Heating Start-up

•

Using Table 9, p. 48 continue the SERVICETEST start-up
procedure for each compressor circuit.

Are the low/high-side pressure temperature caps
secure and in place?

•

Is the thermostat in the OFF position?

•

Is the water flow established and circulating through
all the units?

•

Is the duct work correctly sized, run, taped, insulated
and weather proofed with proper unit arrangement?

•

Is the condensate line properly sized, run, trapped and
pitched?

•

Is the zone sensor (when used) correctly wired and in
a proper location?

•

Does the indoor blower turn freely without rubbing
and is it properly tightened on the shaft? Check the
supply fan belts (if applicable) for proper tension and
the fan bearings for sufficient lubrication. If the belts
require adjustment, or if the bearings need lubricating,
refer to the maintenance section for instructions.

•

Has all work been done in accordance with applicable
local and national codes?

•

Has heat transfer fluid been added in the proper mix to
prevent freezing in closed system application?

•

Are all the unit access panels secure and in place? And,
is unit interior free from tools or debris?

•

Verify that the Remote panel SYSTEM selection switch,
FAN selection switch, and ZONETEMPERATURE
settings for automatic operation are correct.

•

7. To stop the SERVICETEST, turn the main power
disconnect switch to the OFF position or proceed to the
next component start-up procedure.

Is the main disconnect switch or circuit protector
switch that provides the supply power to the unit’s
terminal block or the unit mounted disconnect switch
closed?

•

Is the Night Setback panel (if applicable) programmed
for proper unoccupied operation?

Pre-Startup Checklist

•

For units with economizer option verify ambient
sensor is mounted inside corner post grommet.

Before energizing the unit, the following system devices
must be checked:
•

Check all electrical connections for tightness and point
of termination accuracy.

•

Is the high voltage power supply correct and in
accordance with the nameplate ratings?

•

Is phasing of the unit correct per compressor rotation?

•

Is the field wiring and circuit protection the correct
size?

•

Is the low voltage control circuit wiring correct per the
unit wiring diagram?

•

Is the piping system clean/complete and correct? (A
recommendation of all system flushing of debris from
the water-to-refrigerant heat exchanger, along with air
purging from the water-to-refrigerant heat exchanger
be done in accordance with the Closed-Loop/Ground
Source Heat Pump Systems Installation Guide).

•

Is unit serviceable? (See section “Unit Clearances,”
p. 10 for clearance recommendations.)

WSHP-SVX12B-EN

Start Up
Use this form to thoroughly check-out the system and
units before and during start-up. (This form need not be
returned to the factory unless requested during technical
service support).

Initial Unit Start-up

Job Name:

1. Set the thermostat to the highest position.

Model Number:

2. Set the thermostat system switch to COOL with the fan
control to AUTO.The compressor should NOT run.

Date:
Serial Number:

In order to minimize troubleshooting and costly system
failures, complete the following checks and data entries
before the system is put into full operation.
MODE
Entering fluid temperature degrees F
Leaving fluid temperature degrees F
Temperature differential degrees F
Return air temperature DB/WB degrees F
Supply air temperature DB/WB degrees F
Temperature differential degrees F
Water coil heat exchanger (Water
Pressure IN) PSIG

Heat

Cool

Start-up with the conventional thermostat is included
below:

3. Reduce the thermostat setting until the compressor,
reversing valve, solenoid valve, and loop pump are
energized. Adjust water flow utilizing pressure/
temperature plugs and comparing to tables contained
in specification sheet data. Water leaving the heat
exchanger should be warmer than the entering water
temperature (approximately 9°F-12°F); blower
operation should be smooth; compressor and blower
amps should be within data plate ratings; the suction
line should be cool with no frost observed in the
refrigerant circuit.
4. Check the cooling refrigerant pressures.
5. Turn the thermostat system switch to the OFF position.
Unit should stop running and the reversing valve
should de-energize.

Water coil heat exchanger (Water
Pressure OUT) PSIG

6. Leave unit off for approximately FIVE minutes to allow
for pressure equalization.

Pressure Differential PSIG

7. Turn the thermostat to the lowest setting.

COMPRESSOR

8. Set the thermostat system switch to the HEAT position.

Amps

9. Adjust the temperature setting upward until the unit is
energized. Warm air should blow from the register. A
water temperature decrease of approximately 5° F to 9°
F leaving the heat exchanger should be noted.The
blower and compressor operation should be smooth
with no frost observed in the refrigeration circuit.

Volts
Discharge line temperature (after 10
minutes) degrees F

10. Check the heating refrigerant pressures.
11. Set the thermostat to maintain the desired space
temperature.
12. Instruct the owner on system operation.

WSHP-SVX12B-EN

Start Up

Water Pressure Drop
Table 11 and Table 12 should be used to define feet of
head/pressure drop. Please note the feet of pressure (ft/
head) provided is at ARI/ISO standard.
Note: To calculate feet of head, when using gauges that
read in PSIG, multiply PSI by 2.31.
Table 11.

Cooling water pressure drops (WPD) in feet of
head

Unit Size

EWTF

GPM

Ft.Pressure

036

9.0

11.0

048

12.0

9.0

060

15.0

13.3

072

18.0

11.4

090

22.5

12.1

120

30.0

15.2

150

37.5

13.7

180

19.3

240

13.2

300

13.1

Table 12.

Heating water pressure drops (WPD) in feet of
head

Unit Size

EWTF

GPM

Ft. Pressure

036

9.0

12.0

048

12.0

9.7

060

15.0

14.3

072

18.0

12.3

090

22.5

13.1

120

30.0

16.4

150

37.5

14.8

180

20.8

240

14.3

Table 13. Water volume
Water Side
Water Side
Volume Cubic Volume Cubic
Water Side
Unit Size
In.
Ft.
Volume Gallons

036

.044

.329

048

171

.099

.74

060

171

.099

.74

072

259

.15

1.121

090

210

.122

.910

120

342

.198

1.48

150

508

.296

2.201

180

508

2.96

2.201

240

779

.453

3.374

300

1057

.615

4.576

WSHP-SVX12B-EN

Maintenance
Preventive Maintenance
Maintenance on the unit is simplified with the following
preventive suggestions:
Filter maintenance must be performed to assure proper
operation of the equipment. Filters should be inspected at
least every three months, and replaced when it is evident
they are dirty. Filter sizing includes:
Table 14.

Filter sizing

Unit Size

Filter Size
nominal inch

036-048

2/ 20 x 30 x 1

060

4/16 x 25 x 2

WARNING
Hazardous Chemicals!
Coil cleaning agents can be either acidic or highly
alkaline. Handle chemical carefully. Proper handling
should include goggles or face shield, chemical
resistant gloves, boots, apron or suit as required. For
personal safety, refer to the cleaning agent
manufacturers Materials Safety Data Sheet and follow
all recommended safe handling practices. Failure to
follow all safety instructions could result in death or
serious injury.

072-090

4/ 16 x 25 x 2

It should be noted that the water quality should be checked
periodically. (See Table 15).

120

4/ 20 x 25 x 2

Table 15.

150, 180, 300
Downflow

4/20 x 20 x 2

150, 180, 300
Horizontal
240 Downflow
240 Horizontal

4/20 x 25 x 2

Water quality

Scaling
Calcium and magnesium (total hardness) Less than 350 ppm

8/20 x 25 x 2

Corrosion

8/20 x 20 x 2

pH
Hydrogen Sulfide
Sulfates
Chlorides
Carbon Dioxide
Total dissolved solids (TDS)

4/20 x 16 x 2
12/20 x 20 x 2

7-9.5
Less than 1 ppm
Less than 25 ppm
Less than 125 ppm
Less than 75 ppm
Less than 1000 ppm

Biological Growth
Iron Bacteria

Low

Erosion
Suspended Solids

Low

Note: For other maintenance information concerning the
GERA unit, please read W_C-IOM-1*.

Check the contactors and relays within the control panel at
least once a year. It is good practice to check the tightness
of the various wiring connections within the control panel.
A strainer (60 mesh or greater) must be used on an open
loop system to keep debris from entering the unit heat
exchanger and to ensure a clean system.
For units on well water, it is important to check the
cleanliness of the water-to-refrigerant heat exchanger.
Should it become contaminated with dirt and scaling as a
result of bad water, the heat exchanger will have to be back
flushed and cleaned with a chemical that will remove the
scale.This service should be performed by an experienced
water treatment specialist.

WSHP-SVX12B-EN

Troubleshooting
WARNING
Hazardous Service Procedures!
The maintenance and trouble shooting procedures
recommended in this section of the manual could result
in exposure to electrical, mechanical or other potential
safety hazards. Always refer to the safety warnings
provided throughout this manual concerning these
procedures. When possible, disconnect all electrical
power including remote disconnects before servicing.
Follow proper lockout/tagout procedures to ensure the
power can not be inadvertently energized. When
necessary to work with live electrical components, have
a qualified licensed electrician or other individual who
has been trained in handling live electrical components
per these tasks. Failure to follow all of the
recommended safety warnings provided, could result in
death or serious injury.
Table 16. Troubleshooting
Problem

No response to any
thermostat setting

Unit short cycles

Blower runs, but compressor
does not

Heating

Cooling

Cause

Correction

X
X

Main power off

Check fuses

Defective control transformer

Replace

Broken or loose connection

Repair

Defective thermostat

Replace

Transformer

Reset Transformer

Thermostat or sensor improperly located Relocate

Defective compressor overload

Defective compressor contactor

Replace

Supply Voltage too low

Correct

Defective compressor capacitor

Replace

Defective windings

Replace

Limit switches open

Check cause/Replace or repair

Dirty filter

Replace/clean

Blower RPM too low

Correct

Loss of conditioned air due to leaks in
ductwork

Repair leaks

Introduction of excessively hot return air Correct

Insufficient capacity

Introduction of excessively cold return air Correct

Low on refrigerant charge

Locate leak, repair and recharge by weight
(not by superheat)

Restricted thermal expansion valve

Replace

Defective reversing valve

See WSHP-IOM-# for touch test chart

Thermostat improperly located

Relocate

Unit undersized

Recalculate heat gains/losses

Inadequate water flow

Increase GPM

Scaling in heat exchanger

Clean or replace

Water too hot

Decrease temperature

Water too cold

Increase temperature

Replace (if external)

WSHP-SVX12B-EN

Troubleshooting
Table 16. Troubleshooting (continued)
Problem

High pressure switch open

High head pressure

Heating

Cooling

Cause

Correction

Inadequate GPM

Increase water flow to unit

Water too hot

Decrease temperature

Inadequate air flow

Check, clean blower and coil

Dirty filter

Clean/replace

Overcharged with refrigerant

Decrease charge

Defective pressure switch

Check or replace

Trash in heat exchanger

Backflush

Low water flow

Increase GPM

Overcharge of refrigerant

Decrease charge

Non-condensable in system

Evacuate and recharge by weight

Water too hot

Decrease temperature

Dirty filter

Clean / replace

Inadequate air flow

Check, clean blower and coil
Locate leak, repair and recharge

Undercharged

Restricted thermal expansion valve

Repair / replace

Inadequate air flow

Check, clean blower and coil

Dirty filter

Clean/replace

Inadequate GPM

Increase GPM

Inadequate GPM

Increase GPM

Water too cold

Increase temperature

Inadequate air flow

Increase CFM
Clean/replace

Low suction pressure

X
X

Dirty filter

Undercharged with refrigerant

Increase charge

Defective pressure switch

Replace

Heat transfer fluid too cold

Raise water temperature

Low Pressure switch open

WSHP-SVX12B-EN

Warranty
Standard Warranty
The standard water-source heat pump warranty isTrane
parts-only warranty, running 12 months from startup, not
to exceed 18-months from shipment.

Extended Warranty
The optional extended warranty is a second through fifth
year warranty.The time starts at the end of the standard 1year coverage through the fifth year.
These extended warranties apply only to new equipment
installed in domesticTrane Commercial Systems Group
sales territories and must be ordered prior to start-up.

WSHP-SVX12B-EN

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.

We are committed to using environmentally

Supersedes WSHP-SVX12A-EN (30 Apr 2012)

conscious print practices that reduce waste.

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