Trane Heat Pump GSSD User Manual

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  
18  
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