Trane EXWA User manual

WSHP-SVX02A-EN
Models
“A” and later Design Sequence
Installation
Owner
Diagnostics
Water-to-Water
Water-Source Heat Pump
Models WPWD, GSWD and EXWA
WPWD
024-072 – 60 HZ
GSWD
024-072 – 60 HZ
EXWA
240 – 60 HZ

© 2002 American Standard Inc. WSHP-SVX02A-EN
Notice
NOTICE:
Warnings and Cautions appear at appropriate sections throughout this manual.
Read these carefully.
WARNING -Indicates a potentially hazardous situation which, if
not avoided, could result in death or serious injury.
CAUTION -Indicates a potentially hazardous situation which, if
not
avoided, may result in minor or moderate injury. It
may also be used to alert against unsafe practices.
CAUTION -Indicates a situation that may result in equipment or
property-damage-only accidents.
NOTICE:
Unit contains HCFC (R-22) Refrigerant
Instructions!
Section 608, Paragraph C of the 1990 Clean Air Act states:
Effective July 1, 1992, it shall be unlawful for any person, in course of
maintaining, servicing, repairing, or disposing of an air conditioning system, to
knowingly vent or release any CFC or HCFC refrigerant. Minimal releases (air
purges or refrigerant hoses) associated with good faith attempts to recapture or
recycle are exempt from the ban on venting.
Responsible Refrigerant Practices!
Trane believes that responsible refrigerant practices are important to the
environment, our customers, and the air conditioning industry. All technicians
whohandlerefrigerantsmustbecertified.TheFederalCleanAirAct(Section608)
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 municipalities may have additional requirements that
must also be adhered to for responsible management of refrigerants. Know the
applicable laws and follow them.
Important!
Equipment is shipped FOB (Free on
Board) at the manufacturer. Therefore,
freight claims for damages against the
carrier must be initiated by the receiver.

WSHP-SVX02A-EN 3
Contents
Installation/Startup/Commissioning
4
Pre-installation Checklist 4
General Information 5
Dimensions/Weights 6
Installation Instructions 10
Electrical Requirements 19
Pre-Startup Checklist 20
Startup/Commissioning
21
Sequence of Operation 21
Operating Pressures 22
30
Startup Checklist & Log 24
Maintenance
25
Warranty Information
26
Troubleshooting Checklist
28
Unit Wiring
29

4WSHP-SVX02A-EN
WARNING
Fiberglass Wool!
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.
Jobsite Inspection
Always perform the following checks before accepting a unit:
1. Verify that the nameplate data matches the data on the sales order and bill of
lading (including electrical data).
2. Verify that the power supply complies with the unit nameplate specifica-
tions.
3. 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 com-
pleted. 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
SOLD TO party and future freight claims MAY NOT be accepted by the
freight company.
4. Verify that the refrigerant charge has been retained during shipment by use
of gauges. Schrader taps are located external to the cabinet on the 2-ton
through 6-ton equipment.
5. After assuring that charge has been retained, reinstall the schrader caps to
assure that refrigerant leakage does not occur.
WARNING
Microbial Growth!
Wet interior unit insulation can become an amplification site for
microbial growth (mold), which may cause odors and damage to the
equipment and building materials. If there is evidence of microbial
growth (mold) on the interior insulation, the insulation should be
removed and replaced prior to operating the system.
Jobsite Storage
This unit is intended for indoor use only. To protect the unit from damage due to
the elements, and to prevent possible IAQ contaminant sources from growing,
the unit should be stored indoors. If indoor storage is not possible, the following
provisions for outdoor storage must be met:
1. Place the unit(s) on a dry surface or raise above the ground to assure ade-
quate air circulation beneath the unit.
2. Cover the unit(s) with a water proof tarp to protect them from the elements.
3. Make provisions for continuous venting of the covered units to prevent
moisture from standing on the unit(s) surfaces. Wet interior unit insulation
can become an amplification site for microbial growth (mold) which has
been determined to be a cause of odors and serious health related indoor air
quality problems.
4. Store units in the normal UP orientation to maintain oil in the compressor.
5. Do not stack more than three units in total height for the WPWD/GSWD 2-ton
through 6-ton configurations, and no more than two units high for the EXWA
20-ton configuration.
Pre-installation
Checklist

WSHP-SVX02A-EN 5
General
Information
Unit Nameplate
The unit nameplate is located at the
front of the unit. It includes the unit
model number, serial number, electri-
cal characteristics, refrigerant charge,
and other pertinent unit data.
Compressor Nameplate
The nameplate for the compressors
are located on the compressor shell.
Unit Description
Before shipment, each unit is leak test-
ed, dehydrated, charged with refriger-
ant and run tested for proper control
operation.
Water-to-Refrigerant Coils
The brazed-plate water-to-refrigerant
heat exchangers for the 2-ton through
6-ton equipment are constructed of
stainless steel.
The water-to-refrigerant heat ex-
changersfor the20-ton equipmentare
an inner copper tube or cupro-nickel
(option available on the source-side
only) and steel tube (tube-within-a-
tube) design.
Both heat exchanger types are leak
tested to assure there is no cross leak-
age between the water and refrigerant
gas.
Water Connections
One inch brass swivel connections are
provided for the 2-ton through 6-ton
equipment. Each brass fitting has a
one inch gasket for the connector. The
gaskets are shipped in the electrical
compartmenttopreventlossatthejob
site.
Water connections for the 20-ton are
located inside the unit at the units
front (source-side) and back (load-
side). The fitting consist of a 2-inch fe-
male pipe threaded connection.
Controls
The control system offered to control
the unit is a Basic 24 volt control for
the 2-ton through 6-ton unit sizes, and
a deluxe 24 volt micro processing
board for the 20-ton unit.
All power wiring to the equipment is
made at the unit contactor for the 2-
ton through 6-ton equipment, and at
the power block for the 20-ton equip-
ment.
All low voltage wiring is made at the
unit’s low voltage terminal board.
Wiring Connections
Troubleshooting and connection dia-
gramsfor the equipmentmay belocat-
ed in the back of this manual.
Basic 24V Controls
(for 2-ton through 6-ton units)
Safety devices for equipment contain-
ing the basic 24V control option in-
clude a low pressure switch and a
freezestat to prevent compressor op-
eration during low temperature activi-
ty. The switch is set to activate at
refrigerant pressures of 35 psig or 7
psig to fit most applications.
A high pressure switch prevents com-
pressor operation during high or ex-
cessive discharge pressures
exceeding 395 psig.
The lockout relay communicates the
low or high pressure situation to the
compressor to prevent operation. The
relay may be reset at the thermostat,
or by cycling power to the unit.
General alarm may be accomplished
through the lockout relay to drive light
emitting diodes (LEDs) on a field sup-
plied status indicating thermostat. Ter-
minal6 on thelockoutrelay isopenfor
field use in malfunction indications.
This feature will drive dry contacts
only, and cannot be used to drive field
installed control inputs.
Deluxe 24V Controls
(for 20-ton unit)
Units containing the Deluxe 24V con-
trol design will incorporate a micro-
processor-based control board. The
Trane microprocessor board is factory
wired to a terminal strip to provide all
necessary terminals for field connec-
tion. The deluxe board is equipped
with a random start relay, anti-short
cycle timer, brown out protection,
compressor disable, unit safety con-
trol, diagnostics and a generic relay
(which may be available for field use).
See page 17 for diagnostic informa-
tion.
Desuperheater
(Option for 2-ton through 6-ton units)
For units containing the desuperheat-
er option, the unit is shipped from the
factory with a desuperheater water
coil and pump mounted internal to the
unit cabinetry. For domestic hot water
hook-up instructions, see manual
WSHPC-IN-4 or 72-9006-02.
The desuperheater pump fuse is locat-
ed in the control box within a contain-
er. The fuse is not factory installed to
avoid possible pump damage at initial
start-up. If the fuse in installed and the
unit is started without water in the sys-
tem, the pump will be damaged. See
page 17 for fuse installation.
Schrader Connections
Connections for the low and high side
of the refrigeration system are located
conveniently on the unit’s right side
for the 2-ton through 6-ton units, and
behind the front, refrigeration access
panel for the 20-ton unit.

6WSHP-SVX02A-EN
Table 1: Unit weights
Size Shipping Weight
with pallet (lb)
Shipping
Weight
w/o pallet (lb)
024 163 153
036 183 173
042 203 193
048 214 204
060 244 234
072 277 267
240 1222 1156
WARNING
Improper Unit Lift!
Test lift unit approximately 24 inches to verify proper
center of gravity lift point. To avoid dropping of unit,
reposition lifting point if unit is not level. Failure to
properly lift unit could result in death or serious injury
or possible equipment or property-only damage.
Dimensions/Weights/
Clearance
Figure 1: Mechanical clearances
Unit Location and Clearances
Locate the unit in an indoor area. The
ambient temperature surrounding the
unit must not be less than 45°F. Do
not locate the unit in areas subject to
freezing.
Attention should be given to service
clearance and technician safety. The
unit access panels may be easily re-
moved. There must be enough space
for service personnel to perform main-
tenance or repair. Provide sufficient
room to make water, and electrical
connection(s). Local and national
codes should be followed in providing
electrical power connections. See Fig-
ure 1 for mechanical clearances.

WSHP-SVX02A-EN 7
Dimensions
WPWD/GSWD 024-036

8WSHP-SVX02A-EN
Dimensions
WPWD/GSWD 042-072

WSHP-SVX02A-EN 9
Dimensions
EXWA 240

10 WSHP-SVX02A-EN
General Installation Checks
The checklist below is a summary of
the steps required to successfully in-
stallaunit.Thischecklistisintendedto
acquaint the installing personnel with
procedures required in the installation
process. It does not replace the de-
tailed instructions called out in the ap-
plicable sections of this manual.
1 Removepackaging and inspect the
unit. Check the unit for shipping
damageandmaterialshortage;file
a freight claim and notify appropri-
ate sales representation.
Note: The units have been tied to
the skid by (4) angle brackets. Re-
move these brackets from the unit
to slide unit from skid.
2 Verify the correct model, options
and voltage from the unit name-
plate.
3 Verify the installation location of
the unit will provide the required
clearance for proper operation.
4 Remove refrigeration access panel
and inspect the unit. Be certain the
refrigerant tubing has clearance
from adjacent parts.
WARNING
Hazardous
Voltage!
Disconnect all electric power,
including remote disconnects
before servicing. Follow proper
lockout/tagout procedures to
ensure the power can not be
inadvertentlyenergized.Failureto
disconnect power before
servicing could result in death or
serious injury.
Main Electrical
5 Verify the power supply complies
with the unit nameplate specifica-
tions.
6 Inspect all control panel compo-
nents; tighten any loose connec-
tions.
7 Connect properly sized and pro-
tected power supply wiring to a
field-supplied/installeddisconnect
switch and to the main power ter-
minal block (1TB1) in the unit con-
trol box for the 20-ton equipment,
or (1K1) for the 2-ton through 6-
ton equipment.
8 Install proper grounding wires to
an earth ground.
Note: All field-installed wiring must
comply with NEC and applicable local
codes.
Low Voltage Wiring (AC & DC)
Requirements
9 Connect properly sized control wir-
ing to the proper termination
points between the field supplied
thermostat and the terminal strip
located in the equipment control
box.
Installation

WSHP-SVX02A-EN 11
Figure 2: Racking installation
WARNING
Improper Unit Lift!
Test lift unit approximately 24
inches to verify proper center of
gravity lift point. To avoid
dropping of unit, reposition lifting
point if unit is not level. Failure to
properly lift unit could result in
death or serious injury or possible
equipment or property-only
damage.
Unit Placement
Units may be placed into a field sup-
plied mechanical rack (See Figure 2),
or placed on a finished floor. Loosen
compressor bolts to release tension of
the rubber grommets to help reduce
vibration during operation. Sound
proofing material (field supplied) is
recommended to help attenuate noise
generated by compressor vibration.
It is important to leave appropriate
clearances around the unit to achieve
maintenance and
serviceability to
the equipment.
See page 6 for
service clearance
dimensions.
Water Connection
Connect the source-side and load-side
water-in/water-out from the water-to-
water heat pump to the source system
and the load system.
Note: The source for a water-to-water
heat pump is typically a boiler/cooling
tower or geothermal loop.
The load for a water-to-water heat
pump is typically fresh-air unit(s), fan
coil(s), hydronic coil(s), radiant heat,
wall fin, or potable water.
The source and load connections for
the 2-ton through 6-ton equipment is
on the right hand side of the unit.
The 20-ton equipment incorporates
the source-side connection at the
unit’s front, and the load-side connec-
tion at the unit’s back.
For vibration isolation, it is recom-
mended that flexible steel braided
hoses be installed instead of hard pip-
ing the equipment to the main loop
system or mechanical device.
Trane offers 4-types of hose kit varia-
tions:
• Stainless steel braided flexible
hose with manual shut-off (ball)
valves
• Stainless steel braided flexible
hose with manual deluxe shut-off
(ball) valves
• Stainless steel braided flexible
hose with manual circuit-setter
valve
• Stainless steel braided flexible
hose with automatic balancing
valve
Additional accessories, such as a
strainer are recommended for use to
eliminate contaminants from entering
the brazed-plate or co-axial water-to-
refrigerant heat exchangers.
Installation
Figure 3: Water connection

12 WSHP-SVX02A-EN
Cleaning and Flushing
the Water Loop
After the piping system is complete,
theflexible hose connectorsshouldbe
doubled back to complete the water
circuit external to the unit (avoiding
trash settle-out in the condenser). Fig-
ure 4. An extra pipe may be necessary
to connect the hose kits. See Page 14
for antifreeze/water mixture by vol-
ume.
(1)Watercirculationsystemshouldbe
filled with clean water using the water
make up connections. Note: Air vents
should be opened during filling.
(2) With the air vents closed, start the
circulatingpumpandthencracktheair
vents to bleed off the trapped air, as-
suring circulation through all compo-
nents of the system.
Note:Makeupwatermustbeavailable
to the system to replace the volume
formerly occupied by the air that is
bled off.
(3) With the air vented and the water
circulating, the entire system
should be checked for leaks with re-
pairs made as required.
(4) Operate the supplementary
heat system making checks per
manufacturer’s instructions. Dur-
ing this operation, visual checks
should be made for leaks that may
have occurred due to increased
heat. Repair as required.
(5) Open the system at the lowest
point for the initial blow down
(making sure the make up water is
equal to the water being dumped).
Continue blow down until the water
leaving the drain runs clear, but not
less than 2 hours.
(6) Shut down pumps and supplemen-
taryheat system.Reconnectthe hoses
placing the water-to-refrigerant heat
exchanger in the water circulating sys-
tem.
Note: Vents should be open when the
pumps and supplementary heat sys-
tem are shut down.
Installation
SHUT-OFF 3-WAY
PURGING CAP (2)
BRONZE OR CAST IRON PUMP
FROM UNIT’S
W.O. TO UNIT’S W.I.
Figure 5 Pump module
Figure 6: Hose kit
1" MPT x BARB FITTINGS,
1" MPT x BARB ELBOWS with
PRESSURE TEMPERATURE PORTS,
AND 10’ OF RUBBER HOSE with
4 HOSE CLAMPS.
VALVE (2)
Connecting a Loop Pump Kit
Closed Loop System
All piping external to the unit is the re-
sponsibility of the installer. The water
pipe installation must be done in ac-
cordance with local codes. If no local
codeapplies, national codesshouldbe
followed. It is the contractor’s respon-
sibility to know and adhere to all appli-
cable codes.
Water inlet and outlet to the unit’s wa-
ter-to-refrigerant heat exchanger are
clearly marked on the submittal draw-
ings found on pages 7 through 9. The
supply and return piping must be in-
stalled correctly to the unit to ensure
the safety devices will work properly.
Units that are not piped accordingly
will not obtain the manufacturers war-
ranty.
A pump module (Figure 5) andhose kit
(Figure 6) are typically used to connect
the unit to closed loop piping in do-
mestic applications.
Figure 4: Flushing water loop

WSHP-SVX02A-EN 13
Supply/Return Pipe Connections
to the Loop Pump Kit
(1) Connect the supply and return hos-
es to the water-inlet (from supply) and
water-outlet (to return) of the unit. The
rubber gaskets for the water-in and
water-out connections are located in
the control box. These gaskets require
field installation prior to connecting
the water piping to the unit.
(2) Hand tighten the 1" FPT brass swiv-
el quick connections to the 1" MPT
adapter with P/T ports. Using a
wrench, tighten the adapter approxi-
mately 1/2 additional turn. Care must
be taken to avoid overtightening as to
not dislodge the snap ring.
(3) The water lines should be routed
not to interfere with access to the unit.
The use of a short length of high pres-
sure hose with the swivel fitting may
simplify the connections and prevent
vibration. Pressure/Temperature (P/T)
ports are required for troubleshooting
the hydronic side of the unit. Extreme
care should be taken by the installing
contractor to prevent dirt or other for-
eign matter from entering the pipes or
piping components during construc-
tion.Pipesshouldbecappeduntilthey
are in place and ready to be connected
to the system.
(4) Install the Trane loop pump mod-
ule. See installation manual WSHPC-
IN-5 or 72-9006-03 for instructions. If
the unitdoes not contain a Trane loop
pumpmodule,twoballvalvesmustbe
installed between the unit and the
loop’s water pump to isolate the unit
from the system’s water loop during
maintenance and emergency situa-
tions. See Figure 7.
If the unit s contain a Trane loop pump
module, shut-off valves are supplied
by the manufacturer within the pump
module assembly.
(5) Connectthe unit’swater-in andwa-
ter-out hose to the loop pump module.
(6)The pumps connect totheloadside
230 volt compressor contactor, and re-
quire a field installed 6 amp in-line
fuse and holder.
(7) Insulate all indoor piping. Equip-
ment is designed to operate with fluid
temperature of 25ºFto 120ºF
Installation
Figure 7: Loop pump kit installation

14 WSHP-SVX02A-EN
Water Heater Hook-up (option)
Instructions for connection from the
desuperheater(option) water-in/out to
the domestic hot water heater may be
found in WSHPC-IN-4 or 72-9006-02.
Thiswater heaterkit(Figure 8)shipsin
all units with the desuperheater op-
tion. The kit is zip tied to the compres-
sor base; and consists of piping
connections and shut-off valve.
For units containing the desuperheat-
er option, the desuperheater pump
fuse is located within a container in-
side of the control box. The fuse is not
factory installed.
Note: If the fuse is installed, and the
unit is started without water in the sys-
tem, pump damage may occur.
Using Antifreeze
In areas of the country where entering
water temperatures drop below 45°F
or where piping is being run through
areas subject to freezing, the loop
must be freeze protected by using an
approved antifreeze solution to pre-
vent the earth loop water from freez-
ing inside the heat exchanger.
Methanol and glycols are the most
commonly used antifreeze solutions.
Consult your geothermal unit supplier
for locally approved solutions in your
area.
Propylene glycol is not recommended
in installations where the water tem-
perature are expected to fall below
30°F. At extreme temperatures, the
viscosity increases to the point where
normal loop circulating pumps may
not maintain proper flow.
If propylene glycol is the only locally
approved solution for anti-freeze,
good engineering practices should be
used to achieve the desired flow.
Calculate the approximate volume of
water in the system by using the re-
quirements detailed in Table 2. Add
three gallons to this total to allow for
thewater containedin thehose kit and
geothermal unit.
Table 2: Antifreeze requirements based on volume
Type of Antifreeze Minimum Temperature for Freeze Protection
10°F 15°F 20°F 25°F 30°F
Methanol 25% 21% 16% 10% 3%
Propylene Glycol - - - - 6%
Installation
Figure 8: Water heater kit

WSHP-SVX02A-EN 15
Filling the Loop Pump Kit System
Once the loop, pump module and unit
are fully connected, the system will
need to be filled with water or water/
antifreezesolution. SeePage 14 for an-
tifreeze/water mixture by volume.
Fillboth sides ofthe outsideportion of
the loop first via the pump module.
The hose kit and unit should be filled
last after purging of the ground loop is
complete.
To fill the outside loop; (1) attach a
water hose to the 1-inch FPT brass
valve ports located on the front of the
pump module (the caps at the front of
the module should be removed). (2)
Rotate both valve 1 and valve 2 to the
"Position B" to prevent water from go-
ing to the unit. (3) Turn on the water
and allow the earth loop to slowly fill
with water. (4) Run the water until a
steady flow of water without air bub-
bles is observed coming out of the dis-
charge hose.
To fill the hose kit and unit; (1) Re-
position valve 1 to the "Position A" to
fill the unit and hose kit. (2) Turn the
water on and allow the hose kit and
unit to be filled slowly with water. (3)
Run the water until a steady flow of
water without air bubbles is observed
coming out of the discharge hose.
System Pressurization
(1) Rotate both valves 1 and 2 to the
"Position D" to pressurize the system.
(2) Examine all internal unit fittings or
connections for leaks. (3) After check-
ing for leaks, the system is ready to be
flushed.
Note: There may be a certain amount
of entrained air left in the loop system.
Cleaning and Flushing
the Water Loop
All installations must be thoroughly
flushedto remove airanddirt fromthe
earth loop before running the system.
The pumps used in the pump module
are not adequate to use for the flush-
ing out of the unit. A secondary pump
capableof delivering50 gpmat 60 feet
of head (a 1 1/2 hp or larger pump) is
normally suitable for jobs up to six
tons. The loop must be flushed with a
high volume of water at a minimum
velocity of (2 feet per second) in both
directions. See Table 3 for flow rates
required to flush earth loops.
Table 3: System flushing flow rates
Pipe Gallons per
100 Ft. Minimum Flush GPM
3/4" PE 3.02 3.8
1" PE 4.73 6.0
1 1/4" PE 7.55 9.5
1 1/2" PE 9.93 13.0
2" PE 15.36 21.0
Note: The plastic 1-inch MPT valve
plugs must be replaced after filling
and/or flushing is completed.
See "Position C" for valve rotation to
place the valves in RUN position.
Installation
Filling the Hose Kit and Unit and/or
Hose Kit and Unit Flush Filling the Outside Loop and/or Outside Loop Flush
Run System Full System Flush

16 WSHP-SVX02A-EN
Field Installed Power Wiring
Power wiring to the equipment must
conform to National and Local Electric
Codes (NEC) by a professional electri-
cian.
WARNING
Live Electrical
Components!
During installation, testing, ser-
vicing and troubleshooting of this
product, it may be necessary to
work with live electrical compo-
nents. Have a qualified licensed
electrician or other individual
who has been properly trained in
handling live electrical compo-
nents perform these tasks. Failure
to follow all electrical safety pre-
cautions when exposed to live
electrical components could re-
sult in death or serious injury.
Verify that the power supply available
is compatible with the unit’s name-
plate. Use only copper conductors to
connect the power supply to the unit.
CAUTION
Use Copper
Conductors Only!
Unit terminals are not designed
to accept other types of conduc-
tors. Failure to use copper con-
ductors may result in equipment
damage.
Main Unit Power Wiring
A field supplied disconnect switch
must be installed at or near the unit in
accordance with the National Electric
Code (NEC latest edition).
Location of the applicable electric ser-
vice entrance for HIGH (line voltage)
may be found on the unit submittal at
the front of this manual (pages 7
through 9).
The high voltage connection is made
at the 1TB1 terminal block for the 20-
ton equipment, and at 1K1 for the 2-
ton through 6-ton equipment. The ter-
minal block or contactor is located in-
side the unit control box. Refer to the
customer connection diagram that is
shipped with the unit for specific ter-
mination points.
Provide proper grounding for the unit
in accordance with the local and na-
tional codes.
Control Power Transformer
The 24-volt control power transform-
ers are to be used only with the acces-
sories called out in this manual.
Transformersrated greater than50VA
are equipped with internal circuit
breakers. If a circuit breaker trips, turn
OFF all power to the unit before at-
tempting to reset it.
WARNING
Hazardous Voltage!
Disconnect all electric power, in-
cluding remote disconnects be-
fore servicing. Follow proper
lockout/tagout procedures to en-
sure the power can not be inad-
vertently energized. Failure to
disconnect power before servic-
ing could result in death or seri-
ous injury.
The transformer is located in the
control box.
Installation
Power Wiring

WSHP-SVX02A-EN 17
Controls Using 24 VAC
Before installing any wire, refer to the
electrical access locations on the unit
submittalslocated on pages7through
9.
Ensure that the AC control wiring be-
tween the controls and the unit’s ter-
mination 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.
Check all loads and conductors for
grounds, shorts, and mis-wiring.
Use copper conductors unless other-
wise specified.
Do not run the AC low voltage wiring
in the same conduit with the high volt-
age power wiring.
Low voltage connection diagrams are
shown in Figure 9. Optional desuper-
heater fuse installation shown in Fig-
ure 10.
Table 4: 24V AC conductors
Distance
from unit to Control Recommended Wire Size
000-460 feet 18 gauge
461-732 feet 16 gauge
733-1000 feet 14 gauge
Table 5: Deluxe controller diagnostic LEDs
Color: Green Color: Red Controller Mode
LED1 LED2 LED3
OFF OFF OFF Control OFF
ON OFF OFF Normal/Compressor OFF
ON OFF FLASH Anti-short Cycle
ON OFF ON Normal/Compressor ON
FLASH ON OFF Brownout Condition
ON FLASH ON Soft Lockout (low pressure)
ON FLASH FLASH Soft Lockout (high pressure)
ON ON ON Manual Lockout (low pressure)
ON ON FLASH Manual Lockout (high pressure)
ON FLASH OFF Manual Lockout (condensate overflow)
ON ON OFF Compressor Disable
Installation
Low Voltage Wiring
Figure 9: Low voltage connection
Figure 10: Desuperheater fuse installation

18 WSHP-SVX02A-EN
Changing Freezestat or Low Pres-
sure Cutout Switches
(WPWD/GSWD models ONLY)
Eachunit hastwo factory installed low
pressure cutout switches and one
freezestat. Only one of the low pres-
sure cutout switches is connected to
the 24 volt control circuit, dependent
on which freezestat is being used (i.e.
35°F or 20°F). Both the freezestat and
the low pressure cutout are in the lock-
out relay circuit. The freezestat moni-
tors the temperature of the water
leaving the source and load side wa-
ter-to-refrigerant heat exchangers,
protecting the heat exchanger from
fluid freeze up. The low pressure cut-
out monitors the suction pressure of
the compressor to protect the com-
pressor from liquid floodback or oper-
ating under loss of charge conditions.
Units can be ordered from the factory
with either the 35°F or 20°F freezestat
option. The 20°F freezestat is ONLY
used on closed loop systems with an-
tifreeze solution. The 35°F freezestat is
used on all other systems. The type of
freezestat on a unit can be determined
fromtheappropriatedigitinthemodel
number. Digit 11 and/or 12 with a se-
lection of 1 is a 35°F freezestat, where-
as selection 2 is a 20°F freezestat.
What Freezestat Should Be
Applied?
Aspreviously mentioned,every unitis
shipped from the factory with two low
pressure cutouts installed in the refrig-
erant circuit. One of the low pressure
cutouts disables the compressor at 35
psig, while the other disables the com-
pressor at 7 psig. The 35 psig cutout is
used with the 35°F freezestat, while
the 7 psig cutout is used with the 20°F
freezestat.
Occasionally it will be necessary to
change the freezestat in the field. Ex-
amples of when this change-out is
necessary include:
(1) A unit with a 35°F freezestat is go-
ing to be put on a closed loop system
with antifreeze. By definition, the unit
requires a 20°F freezestat.
(2) A unit with a 20°F freezestat is go-
ing to be put on an open well system
or a closed loop system with NO anti-
freeze solution. By definition, the unit
must have a 35°F freezestat installed
prior to operation.
The best time to install the freezestat/
low pressure cutout is prior to install-
ing the unit. The freezestat is easily ac-
cessible from the top service door.
WARNING
Hazardous Voltage!
Disconnect all electric power, in-
cluding remote disconnects be-
fore servicing. Follow proper
lockout/tagout procedures to en-
sure the power can not be inad-
vertently energized. Failure to
disconnect power before servic-
ing could result in death or seri-
ous injury.
Changing a Freezestat and Low
Pressure Cutout
The freezestat is located in the top of
the source-side water-to-refrigerant
heatexchangerleavingwater line. The
freezestat is located in the twelve
o’clock position. The capillary tube is
inserted into the well approximately 8-
inches.Remove the existingfreezestat
and replace it with the new freezestat.
Note: The wires must be moved from
one low
pressure
cutout to
the other.
The low pres-
sure cutouts are located in
the insu-
lated re-
frigerant
lines. The high
pressurecutout islocat-
ed in the un-insulated
compressor dis-
charge line and is the
only pressure cutout located
inthisline.Changethewiresfrom
the old low pressure cutout to the new
low pressure cutout.
Identifying the Low Pressure Cutouts
The 7 psig low pressure cutout is used
with a 20°F freezestat. It is installed in
the insulated line and is in the piping
teegoingtotheexternalschraderport.
The 35 psig low pressure cutout is
used with a 35°F freezestat. It is in-
stalled in the insulated line and is not
connected to any fittings.
The 395 psig high press cutout is in-
stalledin the un-insulated compressor
discharge line. It is the only cutout lo-
cated in this line. Further, it is connect-
ed to an external schrader port.
If the low pressure cutout is not
changed when the freezestat is
changed,problems willoccur.If the35
psig low pressure cutout is connected
toa 20°F freezestat, theunit willgoout
repeatedly on the low pressure cutout.
If the 7 psig low pressure cutout is
used with the 35°F freezestat, no prob-
lems will occur as long as the freez-
estat is operating normally. However,
if the freezestat does fail, the loop wa-
ter could freeze before the suction
pressure dropped low enough for the
7 psig cutout to take the unit off the
line. Also, in a loss of charge situation,
the heat exchanger would freeze be-
fore the freezestat could take the unit
off-line.
Installation
Figure 11: Pressure switch location

WSHP-SVX02A-EN 19
Table E-1: Electrical performance WPWD/EXWA
Table E-2: Electrical performance GSWD
Model/MBH VOLTS-AC/HZ/PH Min.
Util.
Volt
Max
Util.
Volt
Compressor
Each
RLA
LRA No.
of
Comp
Without Desup With Desup
MCA Max
Fuse Desup RLA MCA Max Fuse
WPWD024 208-230/60/1 197 253 11.4 56.0 114.3 25 0.4 14.7 25
220-240/50/1 198 264 9.6 47.0 112.0 20 0.4 12.4 20
265/60/1 239 292 9.6 47.0 112.0 20 0.4 12.4 20
WPWD036 208-230/60/1 197 253 15.0 73.0 118.8 30 0.4 19.2 30
208-230/60/3 197 253 10.7 63.0 113.4 20 0.4 13.8 20
220-240/50/1 198 264 14.3 71.0 117.9 30 0.4 18.3 30
265/60/1 239 292 14.3 71.0 117.9 30 0.4 18.3 30
380-415/50/3 342 456 5.0 31.0 16.3 15.0 0.4 6.7 15.0
460/60/3 414 506 5.0 31.0 16.3 15 0.4 6.7 15
WPWD042 208-230/60/1 197 253 18.4 95.0 123.0 40 0.4 23.4 40
208-230/60/3 197 253 11.4 77.0 114.3 25 0.4 14.7 25
220-240/50/1 198 264 16.4 83.0 120.5 35 0.4 20.9 35
265/60/1 239 292 16.4 83.0 120.5 35 0.4 20.9 35
380-415/50/3 342 456 5.7 39.0 17.1 15.0 0.4 7.5 15.0
460/60/3 414 506 5.7 39.0 17.1 15 0.4 7.5 15
WPWD048 208-230/60/1 197 253 20.4 109.0 125.5 45 0.4 25.9 45
208-230/60/3 197 253 13.9 88.0 117.4 30 0.4 17.8 30
380-415/50/3 342 456 7.1 44.0 18.9 15.0 0.4 9.3 15.0
460/60/3 414 506 7.1 44.0 18.9 15 0.4 9.3 15
WPWD060 208-230/60/1 197 253 28.0 169.0 135.0 60 0.4 35.4 60
208-230/60/3 197 253 20.0 123.0 125.0 45 0.4 25.4 45
380-415/50/3 342 456 7.5 49.5 19.4 15.0 0.4 9.8 15.0
460/60/3 414 506 7.5 49.5 19.4 15 0.4 9.8 15
575/60/3 517 633 6.4 40.0 18.0 15 0.4 8.4 15
WPWD072 208-230/60/1 197 253 32.1 169.0 140.1 70 0.4 40.5 70
208-230/60/3 197 253 19.3 137.0 124.1 40 0.4 24.5 40
380-415/50/3 342 456 10.0 62.0 112.5 20.0 0.4 12.9 20.0
460/60/3 414 506 10.0 62.0 112.5 20 0.4 12.9 20
575/60/3 517 633 7.8 50.0 19.8 15 0.4 10.2 15
EXWA180 380-415/50/3 342 456 16.7 133.0 237.58 50 -- -- --
EXWA240 208/60/3 197 229 31.7 232.0 271.39 100 -- -- --
230/60/3 207 253 31.7 261.0 271.39 100 -- -- --
460/60/3 414 506 14.1 112.0 231.73 45 -- -- --
575/60/3 518 633 11.2 92.0 225.24 35 -- -- --
Model/MBH VOLTS-AC/HZ/PH Min.
Util.
Volt
Max
Util.
Volt
Compressor
Data No. of
Comp
Aux
Pump
Amps
Desup
Pump
RLA MCA Max FuseRLA LRA
GSWD024 208-230/60/1 197 253 11.4 56.0 12.5 0.4 17.2 25
GSWD036 208-230/60/1 197 253 15.0 73.0 12.5 0.4 21.7 35
GSWD042 208-230/60/1 197 253 18.4 95.0 12.5 0.4 25.9 40
GSWD048 208-230/60/1 197 253 20.4 109.0 12.5 0.4 28.4 45
GSWD060 208-230/60/1 197 253 28.0 169.0 12.5 0.4 37.9 60
GSWD072 208-230/60/1 197 253 32.1 169.0 12.5 0.4 43.0 70
Electrical
Requirements

20 WSHP-SVX02A-EN
Pre-Start
Checklist
Pre-Start-up Checklist
Before energizing the unit, the following system devices must be checked:
____ Is the high voltage power supply correct and in accordance with the nameplate ratings?
____ 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 accor-
dance with the Closed-Loop/Ground Source Heat Pump Systems Installation Guide).
____ Is vibration isolation provided? (i.e. unit isolation pad, hosekits)
____ Is unit serviceable? (See clearance specifications on page 6).
____ Are the low/high-side pressure temperature caps secure and in place?
____ Are all the unit access panels secure and in place?
____ Is the thermostat in the OFF position?
____ Is the water flow established and circulating through all the units?
____ Is the zone sensor correctly wired and in a good location?
____ 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?