WSHPC-IOM-2
72-9041-02
Installation
Operation &
Maintenance
Library
Service Literature
Product Section
Product
Unitary
Water Source Heat Pump
GSSD
Model
Literature Type
Sequence
Date
Installation, Operation and Maintenance
2
June 1999
File No.
SL-UN-WSHP-GSSD-IOM-2-6-99
WSHPC-IOM-2 / 72-9041-01 (Jan 98)
Supersedes
Water Source Heat
Pump Residential
Split Configuration
HVAC System
Since American Standard Inc. has a policy of continuous product improvement, it reserves the right to change specifications
and design without notice. The installation and servicing of the equipment referred in this booklet should be done by qualified,
experienced technicians.
©An American Standard Company
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Model Number Description
GS S D 036 1 0 C 0 0 1 2 0 T
10
15
5
DIGITS 1 & 2 - PRODUCT TYPE
DIGIT 14 - FREEZE PROTEC-
TION
GS = Ground Source Heat Pump
1 = 35 Degree Freezestat
2 = 20 Degree Freezestat
DIGIT 3 - PRODUCT CONFIGU-
RATION
S = Split System
DIGIT 15 - OPEN
0 = Open
DIGIT 4 - DEVELOPMENT SE-
QUENCE D
DIGIT 16 - BRAND
C = Command Aire
T = Trane
DIGITS 5,6 & 7 - UNIT NOMINAL
CAPACITY (MBH)
024 = 24.1
030 = 29.6
036 = 36.4
042 = 41.1
048 = 48.7
060 = 59.2
072 = 65.6
DIGIT 8 - VOLTAGE/HERTZ/
PHASE
1 = 208/230-60-1
DIGIT 9 - UNIT ARRANGEMENT
0 = Split Condensing Unit
DIGIT 10 - DESIGN SEQUENCE C
DIGIT 11 - OPEN DIGIT
0 = Open Digit
DIGIT 12 - OPEN DIGIT
0 = Open Digit
DIGIT 13 - DESUPERHEATER
0 = No Desuperheater
1 = With Desuperheater
3
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General Information
The GSSD split unit has been ARI rat-
ed with the Trane TWE air handlers
with ICM 2 variable speed motors to
create a complete split system for res-
idential applications. The GSSD
equipment is completely assembled,
piped, internally wired and test operat-
ed in the factory. The GSSD equip-
ment is ETL and CSA listed.
ature-out of the hot water heater. The
Brass Loop Water
Connections
desuperheater is disable until the com-
pressor discharge line reaches 145 de-
grees F. The desuperheater pump will
automatically shut off if the tempera-
ture of the incoming water exceeds
125 degrees F to prevent excessive
water temperatures and pump damage.
Two 1-inch brass swivel connectors
on the units help eliminate the need for
a backup wrench when tightening the
loop water connections.
Gaskets for the brass connections can
be found inside a cloth bag located in
the electrical compartment.
Trane provides a twist lock fuse for the
desuperheater. The fuse is shipped
loose to ensure pump integrity. The
pump is water cooled and should be
connected to the water heater prior to
its running.
A prewired terminal strip is provided
for field control wiring.
The system water inlet and outlet con-
nections are female 1-inch National
Pipe Thread (NPT) swivel quick con-
nectors with stainless steel stop ring to
simplify field installation.
Cabinet
The cabinet is constructed of galva-
nized heavy gauge steel. The finish is
applied by an electrostatic powder
spray system in the color of crushed
ice.
The fuse is located in a cloth bag in the
electric box. (See Page 12, Figure 6
for fuse location).
The GSSD units are shipped with a
pressurized dry nitrogen holding
charge to ensure clean components.
Thermostats
The top, front half of the diagonal cab-
inet is removable for access to all of
the internal components by removing
only two screws. All panels are insu-
lated with 1/2-inch thick, neoprene
backed, acoustical fiberglass insula-
tion
All equipment has easy to read decals
and labels to aid in service of unit,
identifying port locations and indicat-
ing caution areas.
The following wall mounted thermo-
stats may be used in conjuction with
these units:
! Single-stage manual changeover
with Heat-Off-Cool system switch
and On-Off fan switch. This
Safety
Desuperheater
thermostat is suitable if there is no
electric backup heater used with a
water-to-air heat pump.
The GSSD was designed with protec-
tion of unit components in mind. High
and low pressure cutouts are included
to prolong the life of the compressor.
A 35 degrees F freezestat for non-anti-
freeze applications or 20 degrees F
freezestat for closed loop with anti-
freeze is included to protect against
fluid freezing in the unit’s water heat
exchanger. All safety devices with ex-
ception of compressor internal over-
load are connected to a lockout relay
to turn off the compressor, the loop
pumps and the desuperheater pump if
a problem is incurred.
(Optional)
The double wall vented desuperheater
uses heat off of the discharge line of
the compressor to preheat a home’s
domestic hot water. Hot water is pro-
vided at virtually no cost to the user
during the cooling operation and effi-
ciently during the heating operation by
reducing the amount of time the hot
water heater runs.
! A single stage cool/two stage heat
manual changeover with Heat-
Off-Cool system switch, Auto/On
fan switch, and a Normal-
Auxiliary-Emergency Heat switch.
TheNormal-Auxiliary-Emergency
Heat switch thermostat is suitable
when an electric backup heater is
used in conjunction with a water-
to-air heat pump.
The desuperheater’s stainless steel,
voluted, circulator pump is built into
the unit. The connections are 1/2-inch
NPT female water inlet and outlet con-
nections. The desuperheater has two
temperature control sensors that mon-
itor the temperature of the discharge
line of the compressor and the temper-
Note:
The lockout relay may be reset by
cycling power to the unit at the dis-
connect or thermostat system switch.
4
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General Information
The refrigerant circuit, including the
Optional extended warranties are
Warranty
compressor, expansion device, revers- available through the local distributor.
ing valve (less solenoid coil), and all
heat exchangers in contact with refrig-
erants are warranted for an additional
four years (parts only).
The unit is warranted by the manufac-
turer against any defects in material
and factory workmanship for one year
after installation (labor and parts).
Note:
If any safety device is bypassed or
removed, the warranty is voided.
5
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Receiving and Handling
The GSSD is packaged in clear stretch
wrap to allow immediate visual in-
spection. A careful inspection should
be made for shipping damage. All or-
ders are free on board (FOB) facto-
ry, therefore claims must be made
with the delivering carrier.
remove the (4) four shipping brackets
from the lower corners of the unit
along with the shipping skid.
! Inspect the overall quality and
appearance of the unit
Note:
Before installing the unit:
! Verify nameplate and model
number are correct.
Carefully remove the stretch wrap and
the top cardboard corner pieces. Also
.
Top Cover
Corners
Wooden Skid
Shipping Brackets
Figure 1: Shipment Packaging
6
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Installation-Location Considerations
Unit Size 024
Unit Weight
Unit Size
(lbs.)
024
163
23-5/16”
23”
6-7/16”
5-1/2”
LOW VOLTAGE
1-1/8” DIA.
TOP VIEW
3-15/16”
1-7/16”
PUMP CONTROL
1-1/8” DIA.
HI VOLTAGE
1-1/8” DIA.
WATER REG
(SCHRADER PORT)
SUCTION/DISCH
3/4” O.D.
LIQUID LINE
1/2” O.D.
WATER OUT
1” NPTI
DESUPER OUT
1/2” NPT
DESUPER IN
1/2” NPT
24-5/16”
LOW PSI SCHRADER
HI PSI
SCHRADER
8-7/16”
13-1/4”
24-13/16”
WATER IN-1” NPTI
FRONT VIEW
SIDE VIEW
7
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Installation-Location Considerations
Unit Weight
Unit Size
Unit Size 030-042
(lbs.)
030
036
042
169
183
203
23-5/16”
23”
6-7/16”
5-1/2”
LOW VOLTAGE
1-1/8” DIA.
TOP VIEW
3-15/16”
1-7/16”
PUMP CONTROL
1-1/8” DIA.
HI VOLTAGE
1-1/8” DIA.
WATER REG
(SCHRADER PORT)
SUCTION/DISCH
3/4” O.D.
LIQUID LINE
1/2” O.D.
WATER OUT
1” NPTI
DESUPER OUT
1/2” NPT
DESUPER IN
1/2” NPT
24-5/16”
LO PSI SCHRADER
HI PSI
SCHRADER
8-7/16”
11-1/2”
24-13/16”
WATER IN-1” NPTI
FRONT VIEW
SIDE VIEW
8
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Installation-Location Considerations
Unit Weight
Unit Size
Unit Size 048-072
(lbs.)
048
060
072
214
244
277
23-5/16”
6-7/16”
5-1/2”
23”
LOW VOLTAGE
3-15/16”
1-7/16”
1-1/8” DIA.
TOP VIEW
PUMP CONTROL
1-1/8” DIA.
HI VOLTAGE
1-1/8” DIA.
LIQUID LINE
1/2” O.D.
WATER OUT
1” NPTI
WATER REG
(SCHRADER PORT)
SUCTION/DISCH
3/4” O.D.
DESUPER OUT
1/2” NPT
DESUPER IN
1/2” NPT
24-5/16”
LO PSI SCHRADER
HI PSI
SCHRADER
8-7/16”
11-1/2”
24-13/16”
WATER IN-1” NPTI
FRONT VIEW
SIDE VIEW
9
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Installation-Water Connections
Location Consideration
! Unit should be placed on a level
surface in a indoor protected area.
Units should not be installed or
stored in an exterior environment.
Remove these two
screws for internal unit
maintenance.
! There should be approximately 2
to 3 feet of clearance available for
accessing the unit for service.
Accessiblity into unit is made by re-
moving (2) two screws at the base of
the system. (See Figure 2).
The top half of the cube then lifts off.
Figure 2: Unit access.
Water Connections
The loop water connections brought to
the unit should be 1-inch male national
pipe threads.
The desuperheater (optional) connec-
tions should be 1/2-inch male national
pipe threads.
Water-out
1” Female NPT
Desuperheater
Water-in
1/2” Female NPT
(See Figure 3 for water hook-up loca-
tions).
Water-in
1” Female NPT
Desuperheater
Water-out
1/2” Female NPT
Figure 3: Water hook-up locations.
Refrigeration Connections
The refrigeration piping connections
are copper stub-outs. All refrigeration
connections are to be soldered into the
unit. It may be necessary to provide an
adapter to connect to the chosen air
handler. (See Figure 4 for location and
sizes).
Liquid Line
1/2” O.D.
Suction
Unit Size
Line (O.D.)
3/4”
024
030-072
Note:
7/8”
All refrigeration piping between the air
handler and the heat pump should be ade-
quately insulated. Water piping should also
be insulated to reduce heat transfer and the
forming of condensation.
Figure 4: Liquid and suction lines.
10
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Installation- Electrical
Field Wiring Connections
GSSD 24V Field Wiring
T-Stat
(X13510588020)
Manual changeover:
-two-stage heat
W1
W2
R
R
3
F
G
4
Y
O
O
6
C
B
1
Power wiring to the unit should be in-
stalled per local electric codes by a
professional electrician.
The wires can be run to the unit
through the available knockouts
and to the control box in the top half of
the unit.
Control wiring to the unit is 24 volt.
The termination point identifications
for the terminal strip is identified per
Figure 5.
2
-one-stage cool
TWE
(Sizes 031-065)
Y
W1
W2
5
Compressor
GSSD
(Sizes 024-072)
Reversing valve (energized
in cooling)
6
5
1
Common
Figure 5: Field wire connections.
1K1 to
Water Pump
and L1 / L2
Hi Voltage
Low Voltage
Pump Control
Terminal Strip
for Low Voltage
to TWE
Ground
11
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Installation- Electrical
Electrical System
24VAC ENERGY LIMITING CLASS II
LOCKOUT
75VA BREAKER TYPE TRANSFORMER
RELAY; 24VAC
The factory tested and installed control
box contains all of the necessary de-
vices to control unit operation in both
the heating and cooling mode. A re-
mote wall thermostat is necessary for
the control of the unit operation. See
General Information for thermostat in-
formation.
COMPRESSOR RUN CAPACITOR
370V
COMPRESSOR CONTACTOR
3 POLE-24VAC
The nameplate provides information
for the application of either time delay
fuses or HACR circuit breakers for
branch circuit protection from the pri-
mary source of power. See Figure 6 for
component specifications.
FUSE; 2 AMP
480V
IF DESUPERHEATER
IS USED, THE FUSE
IS SHIPPED IN A CLOTH
BAG
10 POLE TERMINAL
STRIP; 20A-250V
ALUMINUM
GROUND TERMINAL
Figure 6: Electric component location.
.
Table 1: Electrical Data
Unit Model: GSSD
Volts-60HZ/1Phase
024
030
036
042
048
060
072
208-230
11.4
56
208-230
13.6
67
208-230
15
208-230
18.4
95
208-230
20.4
109
208-230
28
208-230
32.1
169
Compressor RLA
Compressor LRA
Blower Motor RLA
Min. Circuit Amp.
Max Fuse Size
73
169
Electrical
3
5
5.6
5.6
5.6
7.4
7.4
14.7
25
17.4
30
19.2
30
23.4
40
25.9
45
35.4
60
40.5
70
Desuperhtr Pump RLA
0.40
0.40
0.40
0.40
0.40
0.40
0.40
Note: 208/230 volt equipment is designed to operate between 197 and 253 volts. Operation outside of these
ranges is likely to adversely affect the service life of the equipment.
12
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Installation- Electrical
charge situations.
der low charge or catastrophic loss of
The low pressure switch should be
wired to activate at refrigerant
pressures of 35 psig when a 35
degree F freezestat is used; 7 psig
when a 20 degree F freezestat is
used. The installer should verify
that the correct freezestat and low
pressure switch are used in your
application. Misapplication can
produce a failure to the unit and
cause the warranty to be voided.
Pressure Switch
A high pressure switch is provided to
protect the compressor against exces-
sive refrigeration pressure. The low
pressure switch should be wired in ac-
cordance with the type of freezestat
that is used. Trane factory supplies
two low pressure switches in the re-
frigerant circuit. The electrical con-
nection is dependant upon which
The low water temperature switch is
provided to protect the water-to-re-
frigerant heat exchanger from freez-
ing. This device triggers the lock out
relay when leaving water temperatures
fall below the preset freezestat setting.
This device may be reset by cycling
power, but the system should be re-
viewed for operational error.
freezestat (35 or 20 degree) is selected
The pressure switch is used to protect
the compressor against operation un-
Important Notice
HEAT EXCHANGER
35-DEGREE F
OR
20-DEGREE F
FREEZESTAT
7 PSIG LOW PRESSURE
SWITCH USED FOR 20
DEGREE FREEZESTAT
FILTER DRIER
EXPANSION VALVE
DESUPERHEATER
COMPRESSOR
LIQUID LINE
WATER-OUT
SUCTION-DISCH
LINE
35 PSIG LOW PRESSURE
SWITCH USED FOR 35
DEGREE FREEZESTAT
WATER-IN
DESUPERHEATER-OUT
DESUPERHEATER-IN
REVERSING VALVE
DESUPERHEATER PUMP
13
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Typical Wiring Diagram
L2
L1
230V 6A MAX
TO WATERSOURCE PUMP
5F3
5F2
5F1
4
2A
4S6
6G
4S5
6H
6F
6E
DESUPER-
HEATER
PUMP
1K1
L3
7C
6A,C,D,E
A,C
A
6B1
T3
R
C
1C1
7A
A
2B1
S
1K1
L1
5C
C
T1
5C
G
1TB3-1
16
F,G
1K3
C1
1TB3-5
18
1TB3-2
C2
A
C
D,F
1K1
1K3-24
16
A
23
1TB3-7 1TB3-8
1K3
4S4
4S3
4S1
23
19A
D
21A
20A
A
5
1K1-12,14
4S4
1TB3-6
25
A
F
NOTES:
1.
LEGEND
DESCRIPTION
UNLESS OTHERWISE NOTED. ALL SWITCHES ARE
SHOWN AT 77 DEGREES F AT ATMOSPHERIC
PRESSURE. AT 50% RELATIVE HUMIDITY, WITH
ALL UTILITIES TURNED OFF, AND AFTER A
NORMAL SHUTDOWN HAS OCCURRED.
DEVICE
COMPRESSOR CONTACTOR
LOCKOUT RELAY
1K1
1K3
2.
DASHED LINES INDICATE RECOMMENDED FIELD
WIRING BY OTHERS. DASHED LINE ENCLOSURES
AND/OR DASHED DEVICE OUTLINES INDICATE
COMPONENTS PROVIDED BY THE FIELD. DOT
LINE ENCLOSURES INDICATE ALTERNATE
CIRCUITRY OR AVAILABLE SALES OPTIONS.
SOLID LINES INDICATE FACTORY WIRING.
1TB3
1C1
2B1
TERMINAL STRIP
COMPRESSOR RUN CAPACITOR
COMPRESSOR
4L1
4S1
4S3
4S4
4S5
4S6
REVERSING VALVE
FREEZE PROTECTION SW 1
HIGH PRESSURE SW
LOW PRESSURE SW
DISCHARGE LINE T’STAT
ENTERING WATER T’STAT
BEFORE INSTALLING FUSE IN DESUPERHEATER CIRCUIT, BE
CERTAIN PUMP PIPING IS CONNECTED AND FILLED WITH
WATER
4
5F1,2,3
6B1
FUSE
DESUPERHEATER PUMP
14
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Installation - Water Loop
apt to use one million gallons of
Loop Water Applications
Ground Water Applications
water per year. It may be
necessary to install a recharge well
to return the water to the aquifer.
In some soils, this may be difficult
to do.
(Closed Loop)
It should be noted that there is no me-
chanical difference between geother-
mal (closed loop) and ground water
(open loop) GSSD units. Generally in
a closed loop application, there is a
percentage of antifreeze in the water.
In these applications, the 20 degree F
freezestat, along with the 7 psig safety
pressure switch may be used. All other
applications require the 35 degree F
freezestat, along with the 35 psig safe-
ty pressure switch.
Loop sizing should be done by a qual-
ified installer to insure maximized unit
performance.
In areas where the ground water tem-
perature is 66 degrees F or less, the
earth coupling fluid requires at least a
15 percent by volume antifreeze solu-
tion. Using Table 3, calculate the ap-
proximate water volume of the
system. Add one gallon to your total as
an allowance for water in each heat
pump and connection hoses. Check
the earth coupling design for the anti-
freeze percentage required. MORE IS
NOT BETTER-Do no exceed the
amount indicated in the design specifi-
cations.
! Water quality must also be
acceptable to maintain the
integrity and life of the unit. The
loop fluid must have minimal
suspended solids, and must be
non-corrosive to copper or brass.
See Table 2 for specifications.
Ground Water Applications
(Open Loop)
Table 2: Water Supply Requirements
Scaling
Calcium and
Where an existing or proposed well
can provide an ample supply of suit-
able quality water, open ground water
systems may be very efficient. How-
ever, there are several potential con-
siderations that should be addressed
prior to installation of an open loop
system:
magnesium salts
(total hardness)
Less than 350 ppm
Table 3: Water Volume
Corrosion
Volume in Gallons/100 Ft.
pH
7.5-9.5
1 1/4” 1 1/2”
Pipe Size
3/4” 1”
2”
Hydrogen Sulfide
Sulfates
Less than 1 ppm
Less than 25 ppm
Less than 75 ppm
Less than 125 ppm
Volume
SDR-11
3.02 4.73 7.52 9.85 15.4
2.77 4.49 7.77 10.6 17.4
Carbon dioxide
Chloride
! A 60 mesh straining device must
be placed in the incoming water
line. The sand filter/separator
helps ensure clean water by
removing any particles in the
water. Note: A filter/separator
should be available from your
local dealer.
Volume
SCH 40
Total dissolved solids
(TDS)
Less than 1000 ppm
Biological Growth
Use only FULL STRENGTH INHIB-
ITED PROPYLENE GLYCOL OR
METHANOL, not solutions which
have already been diluted.
Iron bacteria
Low
Low
Erosion
Suspended Solids
Note:
! Even if plenty of water is
available, there needs to be an
acceptable way to discharge it
after it has passed through the heat
pump. A three-ton heat pump is
The water quality of the fluid loop
should meet the same specifications
as in Table 2.
15
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Refrigerant Charge
3. Charge the system unit until a
GSSD Units Coupled with
TWE Air Handlers
level of 10 degrees superheat is
achieved. To determine super-
heat, an accurate suction line
temperature needs to be taken
along with the suction pressure.
Table 5: R22 requirement per foot of line
O.D. Tube
Size
Liquid Line
(oz.)
Suction
Line (oz.)
The GSSD IS coupled with the TWE-
E series. Table 4 may be used to deter-
mine the amount of charge necessary
for the split unit system without any
refrigerant line connecting the two.
Table 5 can be used to determine the
amount of refrigerant needed for lines.
By adding the two weights together,
the approximate total system charge
can be obtained. For fine tuning the
charge, see Units Coupled with Non-
TWE Air Handlers and Fine Tuning
in next section.
1/4-inch
3/8-inch
1/2-inch
5/8-inch
3/4-inch
7/8-inch
1 1/8-inch
0.352
0.928
1.152
1.840
4.272
N/A
N/A
4. The sub-cooling will be approxi-
mately 8 degrees to 5 degrees F.
N/A
5. Allow system to run 20 minutes
for conditions to stabilize
before measuring the super-
heat.
0.032
0.048
0.064
0.080
0.144
6. Return water flow to 3 gpm per
nominal ton of capacity.
N/A
Table 4: R22 Requirements
Note:
GSSD
Model
Number
TWE
Model
Number GSSD & TWE
Lbs of R22
for both
If piping runs exceed 50 feet, the next
highest pipe size should be used.
GSSD024
GSSD030
GSSD036
GSSD042
GSSD048
GSSD060
GSSD072
TWE031E
TWE031E
TWE040E
TWE040E
TWE065E
TWE065E
TWE065E
5.0
5.0
GSSD Units Coupled with
Non-TWE Air Handlers and
Fine Tuning
8.25
9.25
1. Place the GSSD system in the
9.25
cooling mode.
10.125
10.75‘
2. Throttle down the water flow
with a ball valve until the leaving
fluid temperature is 95 degrees F.
16
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Refrigeration System
loop applications and closed loop
the unit is in the cooling mode and
de-energizes in the heating mode.
Refrigeration System
applications without adequate
antifreeze. A 20 degree F
! Compressor: The unit includes a
high efficiency scroll compressor
with and internal vibration isolator
that absorbs starting and stopping
energy. It also contains an internal
overload protection. External
vibration isolation is provided by
rubber mounting devices located
underneath the mounting base of
the compressor.
! Refrigerant Tubing: All refrigerant
tubing is constructed of copper.
The low temperature refrigerant
lines are factory insulated with a 3/
8-inch thick elastomeric insulation
(UL 94V-5 rated), with a flame
spread rating of less than 25 and
smoke density rating of less than
50. It has been tested in
freezestat may be used with closed
loop applications with antifreeze
solution only. A lockout relay
circuit consisting of three safety
devices (low pressure, high
pressure, and Freezestat) will
trigger the lockout relay to shut off
the compressor, the loop pumps
and the desuperheater pump
(optional) when a safety is tripped.
A triggered lock-out relay is a key
indication that there is a problem
in the system and service may be
necessary. The safety that caused
the lockout relay to energize will
reset itself after approximately
five minutes. If the lockout relay is
manually reset by power
accordance with ASTM-85.
! Water-to-Refrigerant Heat
Exchanger: The water-to-
! Refrigerant Metering: The
refrigeration circuit is provided
with a bi-directional thermal
expansion valve to allow operation
with entering water temperatures
from 25 degrees F to 120 degrees
F.
refrigerant heat exchanger is a
high quality stainless steel braze
plate heat exchanger. This
stainless material offers
exceptional corrosion resistance.
The heat exchanger has a working
pressure rating of 450 psig on both
the refrigerant and water sides. To
help ensure clean water for the
water-to-refrigerant heat
exchanger, Trane recommends a
sand filter/separator for open loop
systems.
interruption prior to this five
minute period, the unit will be
unable to run. To manually reset
the lockout relay, the disconnect or
system switch at the thermostat
must be toggled.
! Liquid Line Filter: The unit
contains a bi-directional liquid line
filter drier to remove any
contaminants within the
refrigeration circuit.
! Servicing Pressure Ports: The
equipment is provided with both
high and low pressure schraeder
ports. The ports are located
outside the unit case for
! Reversing Valve: The reversing
valve is a pilot operated sliding
piston type with replaceable
! Freezestat and Lock-out Relay: A
freezestat is included to protect the
unit from unusually cold loop fluid
temperatures or no fluid flow
conditions. A 35 degree F
encapsulated magnetic coil. The
reversing valve is energized when
convenient access.
freezestat is necessary in open
17
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Miscellaneous Equipment
and the loop pump module. This
isolation device is a much less
expensive and very effective
alternative. When the compressor
begins running, the valve will
open, allowing water to flow
through the unit. As the
compressor shuts down, the valve
slowly closes off. The main
purpose of the automatic device is
to prevent water hammer, by
keeping the pressure raised in the
loop system during off cycles.
necessary components for the
Accessory Items
installation, operation and
maintenance of the water circuit of
a closed loop geothermal
application. Standard pump
module features include insulated
Grundfos pumps, insulated
cabinet, optional cast iron or
bronze pumps, 3-way brass valves
and the choice of a one or two
pump module.
Note:
The following equipment may be pur-
chased through the nearest Trane dis-
tributor.
! Water Regulating Valve Assembly:
The water regulating valve
assembly consists of a direct
acting valve and a reverse acting
valve. The direct acting valve
opens in response to an increase in
discharge pressure during the
cooling cycle. The reverse acting
valve opens in response to a
decrease in suction pressure
during the heating cycle. Water
regulating valves should be used
where low flow, and low or high
fluid temperature conditions could
occur.This option is beneficial
with open loop systems, but not
necessary.
! Hose Kits: The hose kits include
two brass, 1-inch male pipe thread
(MPT) by barb-fittings, two brass
90 degree 1-inch, MPT by barb-
elbows with pressure/temperature
ports and 10 feet of rubber hose
with 4 hose clamps.
! Electric Strip Heaters: If the ETL
listed strip heaters are used, they
can be installed directly inside the
TWE air handler. These heaters
are rated at 230 volts and provide
electric heat for both supplemental
and emergency heat requirements.
There are a number of heater
! Sand Filter/Separator: A sand
filter/separator helps ensure clean
water for the water-to-refrigerant
heat exchanger. The recommended
strainer is 60 mesh or greater. The
strainer keeps particles and debris
from entering the system.
capacities available.
! Pump Module: The pump module
and the hose kit make a complete
self-contained pumping package
for the earth-coupled heat pump
system. These kits contain all the
! Motorized Water Valve for open
loop systems: The motorized water
valve is installed on the return line
of the system between the loop
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