Trane Heat Pump 4TWA3 User Manual

SSP-SVN04A-EN  
18-BC62D1-1  
Installer’s Guide  
Heat Pumps  
4TWA3  
ALL phases of this installation must comply with NATIONAL, STATE AND LOCAL CODES  
IMPORTANT — This Document is customer property and is to remain with this unit. Please return to service information  
pack upon completion of work.  
These instructions do not cover all variations in  
!
CAUTION  
systems nor provide for every possible contingency  
to be met in connection with installation. All phases  
of this installation must comply with NATIONAL,  
STATE AND LOCAL CODES. Should further informa-  
tion be desired or should particular problems arise which  
are not covered sufficiently for the purchaser’s purposes,  
the matter should be referred to your installing dealer or  
local distributor.  
UNIT CONTAINS R-410A REFRIGERANT!  
R-410A OPERATING PRESSURE EXCEEDS THE  
LIMIT OF R-22. PROPER SERVICE EQUIPMENT IS  
REQUIRED. FAILURE TO USE PROPER SERVICE  
TOOLS MAY RESULT IN EQUIPMENT DAMAGE OR  
PERSONAL INJURY.  
A. GENERAL  
SERVICE  
!
WARNING  
USE ONLY R-410A REFRIGERANT AND  
APPROVED POE COMPRESSOR OIL.  
This information is intended for use by individuals posses-  
sing adequate backgrounds of electrical and mechanical  
experience. Any attempt to repair a central air conditioning  
product may result in personal injury and or property  
damage. The manufacturer or seller cannot be responsible  
for the interpretation of this information, nor can it assume  
any liability in connection with its use.  
5 FT. ABOVE UNIT — UNRESTRICTED  
1
NOTICE:  
Trane has always recommended installing Trane approved  
matched indoor and outdoor systems.  
The benefits of installing approved matched systems are  
maximum efficiency, optimum performance and best  
overall system reliability.  
!
WARNING  
These units use R-410A refrigerant which operates at 50 to  
70% higher pressures than R-22. Use only R-410A approved  
service equipment. Refrigerant cylinders are painted a  
“Rose” color to indicate the type of refrigerant and may  
contain a “dip” tube to allow for charging of liquid refriger-  
ant into the system. All R-410A systems use a POE oil that  
readily absorbs moisture from the atmosphere. To limit this  
“hygroscopic” action, the system should remain sealed  
whenever possible. If a system has been open to the  
atmosphere for more than 4 hours, the compressor oil  
must be replaced. Never break a vacuum with air and always  
change the driers when opening the system for component  
replacement. For specific handling concerns with R-410A  
and POE oil, reference Retrofit Bulletin TRN-APG02-EN.  
The Weathertron® Heat Pump has been designed and manu-  
factured to withstand and operate in severe winter condi-  
tions. However, there are precautionary steps which should  
be taken at the time of installation which will help assure  
the efficient operation of the unit. It is recommended that  
these precautions be taken for units being installed in  
areas where snow accumulation and prolonged below  
freezing temperatures occur.  
1. Units should be elevated 3 to 12 inches above the pad or  
rooftop, depending on local weather. This additional  
height will allow better drainage of snow and ice (melted  
during defrost cycle) prior to its refreezing. This should  
prevent a build-up of ice around the unit which occurs  
when unit is not elevated. Insure that drain holes in  
unit base pan are not obstructed preventing  
draining of defrost water.  
Check for transportation damage after unit is uncrated.  
Report promptly, to the carrier, any damage found to the unit.  
To determine the electrical power requirements of the unit,  
refer to the nameplate of the unit. The electrical power  
available must agree with that listed on the nameplate.  
2. If possible, avoid locations that are likely to accumulate  
snow drifts. If not possible, a snow drift barrier should be  
installed around the unit to prevent a build-up of snow on  
 
Installer’s Guide  
NOTICE:  
GAS LINE BALL SERVICE VALVE  
Precautions should be taken to avoid heat damage to  
basepan during brazing. It is recommended to keep the  
flame directly off of the basepan.  
4
5
CAP  
1/4 TURN ONLY  
COUNTERCLOCKWISE  
FOR FULL OPEN  
POSITION  
7. Use a Dry Nitrogen Purge and Brazing Alloy without flux  
when brazing the field line to the copper factory connec-  
tion. Flow dry nitrogen into either valve pressure tap port,  
thru the tubing and out the other port while brazing.  
VALVE STEM  
UNIT SIDE  
OF VALVE  
8. Braze using accepted good brazing techniques.  
LEAK CHECK  
IMPORTANT:  
PRESSURE TAP PORT  
GAS LINE CONNECTION  
Replace pressure tap port valve core before attaching hoses for  
evacuation.  
After the brazing operation of refrigerant lines to both the  
outdoor and indoor units is completed, the field brazed  
connections must be checked for leaks. Pressurize through  
the service valve ports, the indoor unit and field refrigerant  
lines with dry nitrogen to 350-400 psi. Use soap bubbles or  
other leak-checking methods to see that all field joints are  
leak-free! If not, release pressure; then repair!  
GAS LINE SERVICE VALVE  
SYSTEM EVACUATION  
NOTE:  
Since the outdoor unit has a refrigerant charge, the gas and  
liquid line valves must remain closed.  
1. Upon completion of leak check, evacuate the refrigerant  
lines and indoor coil before opening the gas and liquid  
line valves.  
2. Attach appropriate hoses from manifold gauge to gas and  
liquid line pressure taps.  
pressure tap service port (when depressed) opens only to the  
field brazing side of the valve when the valve is in the seated  
position. The liquid line valve is not a back seating valve (see  
WARNING below).  
NOTE:  
Unnecessary switching of hoses can be avoided and com-  
plete evacuation of all lines leading to sealed system can be  
accomplished with manifold center hose and connecting  
branch hose to a cylinder of R-410A and vacuum pump.  
!
WARNING  
Extreme caution should be exercised when opening the  
Liquid Line Service Valve. Turn valve stem counterclock-  
wise only until the stem contacts the rolled edge. (See  
Figure 4.) No torque is required.  
3. Attach center hose of manifold gauges to vacuum pump.  
4. Evacuate until the micron gauge reads no higher than  
350 microns.  
BRASS GAS LINE SERVICE VALVE  
5. Close off valve to vacuum pump and observe the micron  
gauge. If gauge pressure rises above 500 microns in  
one (1) minute, then evacuation is incomplete or system  
has a leak.  
6. If vacuum gauge does not rise above 500 microns in  
one (1) minute, the evacuation should be complete.  
The Brass Gas Line Service Valve is shipped in the closed  
position to hold the factory refrigerant charge. The pressure  
tap service port (when depressed) opens only to the field  
brazing side when the valve is in the closed position.  
The Gas Line Service Valve is full open with a 1/4 turn. See  
Figure 4.  
7. Blank off vacuum pump and micron gauge, close valves  
on manifold gauge set.  
BRAZING REFRIGERANT LINES  
1. Remove lower access cover to access service valves.  
2. Before brazing, remove plugs from external copper stub  
tubes. Clean internal and external surfaces of stub tubes  
prior to brazing.  
NOTE:  
DO NOT VENT REFRIGERANT INTO THE ATMOSPHERE.  
NOTE:  
A 3/16" Allen wrench is required to open liquid line service  
valve. A 1/4" Open End or Adjustable wrench is required to  
open gas line valve. A 3/4" Open End wrench is required to  
take off the valve stem cap.  
3. Cut and fit tubing, minimizing the use of sharp 90° bends.  
4. Insulate the entire gas line and its fittings.  
5. Do NOT allow uninsulated liquid line to come in direct  
contact with bare gas line.  
8. The liquid line shut-off valve can now be opened. Remove  
shut-off valve cap. Fully insert hex wrench into the stem  
and backout counterclockwise until valve stem just  
touches rolled edge (approximately five [5] turns) observ-  
ing WARNING statement on page 3. See Figure 3.  
6. Precautions should be taken to avoid heat dam-  
age to the pressure tap valve core during braz-  
ing. It is recommended that the pressure tap port  
valve core be removed and a wet rag wrapped  
around the valve body.  
9. Replace liquid service pressure tap port cap and valve  
stem cap. These caps MUST BE REPLACED to prevent  
leaks. Replace valve stem and pressure tap cap finger  
tight, then tighten an additional 1/6 turn.  
NOTICE:  
Use care to make sure that no moisture enters pressure tap  
port, while wet rag is being used.  
18-BC62D1-1  
3
 
Installer’s Guide  
10. The gas valve can now be opened. For a ball type gas  
valve, open the gas valve by removing the shut-off valve  
cap and turning the valve stem 1/4 turn counterclock-  
wise, using 1/4" Open End or Adjustable wrench. See  
Figure 4. For brass gas line service valve opening, follow  
8 and 9 on page 3. See Figure 5.  
In normal operation, the defrost control light will flash once  
each second. If the light is flashing more than once per  
second or not at all, refer to the service manual for that unit.  
PIN IDENTIFICATION (See Figure 6.)  
1. TEST_COMMON (Shorting any of the other pins to this  
pin causes the function of the other pin to be executed.  
Leaving this pin open results in the normal mode of  
operation.)  
2. TST = Test (Shorting TEST_COMMON to this pin  
speeds up all defrost board timings.)  
11. The gas valve is now open for refrigerant flow. Replace  
valve stem cap to prevent leaks. Again, these caps MUST  
BE REPLACED to prevent leaks. Replace valve stem  
and pressure tap cap finger tight, then tighten an  
additional 1/6 turn. See Figure 3.  
3. FRC_DFT = Forced Defrost (Short TEST_COMMON to  
this pin for two [2] seconds to initiate a forced defrost.  
Remove the short after defrost initiates.)  
If refrigerant lines are longer than 15 feet and/or a different  
size than recommended, it will be necessary to adjust system  
refrigerant charge upon completion of installation. See page 6  
or the unit Service Facts.  
PIN IDENTIFICATION  
6
E. ELECTRICAL CONNECTIONS  
!
WARNING  
When installing or servicing this equipment, ALWAYS  
exercise basic safety precautions to avoid the possibility  
of electric shock.  
1. Power wiring and grounding of equipment must comply  
with local codes.  
2. Power supply must agree with equipment nameplate.  
3. Install a separate disconnect switch at the outdoor unit.  
4. Ground the outdoor unit per local code requirements.  
DEFROST CONTROL CHECKOUT  
5. Provide flexible electrical conduit whenever vibration  
transmission may create a noise problem within the  
structure.  
6. The use of color coded low voltage wire is recommended to  
simplify connections between the outdoor unit, the  
thermostat and the indoor unit.  
Normal operation requires:  
a. LED on board flashing 1 time/second.  
b. 24V AC between R & B.  
c. 24V AC between Y & B with unit operating.  
d. Defrost initiation when FRC_DFT pin is shorted to  
TEST_COMMON pin.  
Table 1 — NEC Class II Control Wiring  
If a defrost control problem is suspected, refer to the service  
information in control box.  
24 VOLTS  
WIRE SIZE  
18 AWG  
16 AWG  
14 AWG  
MAX. WIRE LENGTH  
150 FT  
!
WARNING  
Do NOT connect 24 VAC to T1 (ODS-A) terminal. ODS-A  
thermistor WILL BE BLOWN.  
225 FT.  
300 FT.  
G. COMPRESSOR START UP  
After all electrical wiring is complete, SET THE THERMO-  
STAT SYSTEM SWITCH IN THE OFF POSITION SO  
COMPRESSOR WILL NOT RUN, and apply power by  
closing the system main disconnect switch. This will activate  
the compressor sump heat (where used). Do not change the  
Thermostat System Switch until power has been applied for  
one (1) hour. Following this procedure will prevent potential  
compressor overload trip at the initial start-up.  
7. Table 1 defines maximum total length of low voltage  
wiring from outdoor unit, to indoor unit, and to  
thermostat.  
8. Mount the indoor thermostat in accordance with instruc-  
tion included with the thermostat. Wire per appropriate  
hook-up diagram (included in these instructions).  
F. DEFROST CONTROL  
The demand defrost control measures heat pump outdoor  
ambient temperature with a sensor located outside the  
outdoor coil. A second sensor located on the outdoor coil is  
used to measure the coil temperature. The difference  
between the ambient and the colder coil temperature is the  
difference or delta-T measurement. This delta-T measure-  
ment is representative of the operating state and relative  
capacity of the heat pump system. By measuring the change  
in delta-T, we can determine the need for defrost. The coil  
sensor also serves to sense outdoor coil temperature for  
termination of the defrost cycle.  
H. OPERATIONAL AND  
CHECKOUT PROCEDURES  
Final phases of this installation are the unit Operational and  
Checkout Procedures which are found in this instruction on  
page 8. To obtain proper performance, all units must be  
operated and charge adjustments made in accordance with  
procedures found in the Service Facts and on page 6.  
IMPORTANT:  
Perform a final unit inspection to be sure that factory tubing has  
not shifted during shipment. Adjust tubing if necessary so tubes  
do not rub against each other when the unit runs. Also be sure  
that wiring connections are tight and wire routing is secure.  
FAULT IDENTIFICATION  
A fault condition is indicated by the flashing light on the  
defrost control inside the heat pump control box.  
4
18-BC62D1-1  
 
Installer’s Guide  
I. ELECTRIC HEATERS  
M. TROUBLESHOOTING  
Electric heaters, if used, are to be installed in the air han-  
dling device according to the instructions accompanying the  
air handler and the heaters.  
TROUBLESHOOTING CHART — WHAT TO CHECK  
SYSTEM FAULTS  
J. START CONTROL  
Some models have quick start components which are  
factory installed. For models that do not have factory  
installed start components, provisions are made for a field  
installed start kit accessory. When adding an accessory,  
follow the instructions provided with the kit.  
REFRIGERANT CIRCUIT  
C
H
C
H
C
H
C
H
C
H
C
H
C
H
P
P
P
P
S
S
P
S
S
S
S
S
Head Pressure Too High  
Head Pressure Too Low  
Suction Pressure Too High  
Suction Pressure Too Low  
Liquid Refrig. Floodback (TXV)  
I.D. Coil Frosting  
P
P
S
S
S
S
P
P
S
S
S
S
S
S
S
S
S
S
P
P
S
S
P
P
P
P
P
S
P
P
S
S
S
S
S
S
P
P
P
P
K. OUTDOOR THERMOSTAT  
P
An outdoor thermostat TAYSTAT250B may be field installed.  
For data, see wiring diagram attached to unit and instruc-  
tion sheet packaged with outdoor thermostat.  
S
S
P
P
S
S
S
S
P
P
S
S
S
S
S
S
S
Compressor Runs  
Inadequate or No Cooling/Htg  
ELECTRICAL  
C
H
C
H
C
H
C
H
C
H
C
H
P
P
P
P
P
P
P
P
S
S
P
P
S
S
P
P
P
P
Compressor  
Won’t Start  
&
O.D. Fan  
S
S
P
P
P
P
P
P
P
P
S
S
S
S
S
S
S
S
S
S
S
S
P
P
Compressor Will Not Start  
But O.D. Fan Runs  
L. SEACOAST SALT SHIELD  
O.D. Fan Won’t Start  
Units installed within one mile of salt water including  
seacoasts and inland waterways, require the addition of  
BAYSEAC001 (Seacoast Kit) at the time of installation.  
S
S
S
S
S
S
S
S
P
P
P
P
Compressor Hums But Won’t Start  
Compressor Cycles on IOL  
P
P
P
P
S
S
S
S
P
P
P
P
S
S
S
S
S
S
S
S
S
P
P
P
S
S
P
P
S
S
S
S
I.D. Blower Won’t Start  
DEFROST  
IMPORTANT:  
See Limited Warranty information in Use and Care Manual.  
C
H
C
H
C
H
Unit Won’t Initiate Defrost  
P
P
P
P
P
P
Defrost Terminates on Time  
Unit Icing Up  
P
P
S
S
S
C
-
Cooling  
H
-
Heating  
P
-
Primary Causes  
S
-
Secondary Causes  
-
3
Phase Only  
*
TYPICAL FIELD HOOK-UP DIAGRAMS  
Notes:  
1. Be sure power supply agrees with equipment nameplate.  
2. Power wiring and grounding of equipment must comply with local codes.  
3. Low voltage wiring to be No. 18 AWG minimum conductor.  
4. ODT-B must be set lower than ODT-A.  
5. If outdoor thermostats (ODT) are not used, connect W1 to W2 and W3.  
6. N/A to programmable thermostat.  
LEGEND  
FACTORY WIRING  
FIELD WIRING  
18-BC62D1-1  
5
 
Installer’s Guide  
SUBCOOLING CHARGING IN COOLING ABOVE 55°F OD AMBIENT  
The Trane company has always recommended installing  
remove refrigerant to lower the pressure. Again, wait  
Trane approved matched indoor and outdoor systems.  
twenty (20) minutes for the system conditions to stabilize  
before adjusting charge again.  
All Trane split systems are ARI rated with only TXV indoor  
systems.  
The benefits of installing approved indoor and outdoor split  
systems are maximum efficiency, optimum performance and  
the best overall system reliability.  
8. When system is correctly charged, you can refer to  
System Pressure Curves (in Service Facts) to verify  
typical performance.  
R-410A REFRIGERANT CHARGING CHART  
The following charging methods are therefore  
prescribed for systems with indoor TXVs.  
DESIGN SUBCOOLING ( F)  
˚
LIQUID  
TEMP  
( F)  
˚
1. Subcooling (in the cooling mode) is the only  
8
9
10  
11  
12  
13  
14  
recommended method of charging above  
55°F ambient temperatures.  
LIQUID GAGE PRESSURE (PSI)  
2. For best results - the indoor temperature  
should be kept between 70°F to 80°F. Add  
system heat if needed.  
3. At start-up, or whenever charge is removed  
or added, the system must be operated for a  
minimum twenty (20) minutes to stabilize  
before accurate measurements can be made.  
4. Measure Liquid Line Temperature and  
Refrigerant Pressure at service valves.  
5. Determine total refrigerant line length,  
and height (lift) if indoor section is above  
the condenser.  
55  
60  
65  
70  
75  
80  
85  
90  
95  
100  
105  
110  
115  
120  
125  
179  
195  
211  
229  
247  
267  
287  
309  
331  
355  
381  
407  
435  
464  
495  
182  
198  
215  
232  
251  
271  
291  
313  
336  
360  
386  
413  
441  
470  
501  
185  
201  
218  
236  
255  
275  
296  
318  
341  
365  
391  
418  
446  
476  
507  
188  
204  
222  
240  
259  
279  
300  
322  
346  
370  
396  
424  
452  
482  
514  
191  
208  
225  
243  
263  
283  
304  
327  
351  
376  
402  
429  
458  
488  
520  
195  
211  
229  
247  
267  
287  
309  
331  
355  
381  
407  
435  
464  
495  
527  
198  
215  
232  
251  
271  
291  
313  
336  
360  
386  
413  
441  
470  
501  
533  
6. Determine the Design Subcool Charging  
Temperature from the unit nameplate.  
7. Locate this value in the appropriate column  
of the Subcooling Charging Table. Locate  
your liquid line temperature in the left  
column of the table, and the intersecting  
liquid line pressure under your nameplate  
subcool value column. Add refrigerant to  
raise the pressure to match the table, or  
Refer to Service Facts or  
Installer's Guide for charging method.  
From Dwg. D154557P01 Rev. 2  
SUBCOOL CHARGING TABLE CORRECTIONS FOR LINE LENGTH AND RISE  
60  
50  
40  
30  
25  
20  
15  
10  
0
Add 10 psig to Subcool Charging Table Pressure  
Use Design Subcool Value from Table  
Subtract 10 psig from S.C. Table Pressure  
10  
20  
25  
30  
40  
60  
80  
TOTAL REFRIGERANT LINE LENGTH (FEET)  
SUBCOOLING CHARGING BELOW 55°F OD AMBIENT – IN HEATING ONLY  
1. The Subcool Charging Method in cooling is not recom-  
mended below 55°F outdoor ambient.  
4. Check liquid line temperature and pressure (at the  
OD valves) to obtain a minimum of 10°F subcooling.  
2. The only recommended method of charging at outdoor  
ambients below 55°F, is to weigh in the charge in the  
heating mode.  
3. Use Nameplate charge plus standard charge adders for  
line length.  
5. Add charge if a minimum of 10°F subcooling is not obtained  
with the nameplate charge plus line length correction.  
6. It is important to return in the spring or summer to  
accurately charge the system in the cooling mode at  
outdoor ambients above 55°F.  
6
18-BC62D1-1  
 
Installer’s Guide  
4TWA3 OUTLINE DRAWING  
NOTE: ALL DIMENSIONS ARE IN MM (INCHES).  
MODELS BASE FIG.  
A
B
C
D
E
F
G
H
J
K
4TWA3030A  
4TWA3036A  
4TWA3042A  
4TWA3048A  
4TWA3060A  
3
4
4
4
4
1
1
1
1
1
933 (36-3/4) 829 (32-5/8) 756 (29-3/4) 3/4 5/16 143 (5-5/8) 92 (3-5/8) 210 (8-1/4) 79 (3-1/8) 508 (20)  
943 (37-1/8) 946 (37-1/4) 870 (34-1/4) 3/4  
943 (37-1/8) 946 (37-1/4) 870 (34-1/4) 3/4  
1045 (41-1/8) 946 (37-1/4) 870 (34-1/4) 7/8  
1045 (41-1/8) 946 (37-1/4) 870 (34-1/4) 7/8  
3/8  
3/8  
3/8  
3/8  
152 (6)  
152 (6)  
152 (6)  
152 (6)  
98 (3-7/8) 219 (8-5/8) 86 (3-3/8) 508 (20)  
98 (3-7/8) 219 (8-5/8) 86 (3-3/8) 508 (20)  
98 (3-7/8) 219 (8-5/8) 86 (3-3/8) 508 (20)  
98 (3-7/8) 219 (8-5/8) 86 (3-3/8) 508 (20)  
From Dwg. D153074 Rev. 13  
18-BC62D1-1  
7
 
Installer’s Guide  
MOUNTING HOLE LOCATION  
NOTE: ALL DIMENSIONS ARE IN MM (INCHES).  
NOTE:  
For model base size,  
see table on page 7.  
From Dwg. 21D152989 Rev. 0  
CHECKOUT PROCEDURE  
After installation has been completed, it is recommended that the entire system be checked against the following list:  
1. Refrigerant Line, Leak checked ................................... [  
2. Suction Lines and Fittings properly insulated ............ [  
]
]
8. Supply registers and return grilles open and  
unobstructed ................................................................ [  
]
]
9. Return air filter installed............................................. [  
3. Have all Refrigerant Lines been secured and  
isolated properly? ......................................................... [  
]
10. Thermostat thermometer is accurate. Check  
against a reliable thermometer. Adjust per  
4. Have passages through masonry been sealed?  
If mortar is used, prevent mortar from coming  
into direct contact with copper tubing ......................... [  
5. Verify tightness of all electrical connects .................... [  
6. Observe outdoor fan during on cycle for clearance  
and smooth operation................................................... [  
instructions with thermostat ....................................... [  
]
]
]
]
]
11. Is correct speed tap being used?  
(Indoor blower motor)................................................... [  
12. Operate complete system in each mode to  
insure safe operation. ................................................... [  
]
]
7. Indoor coil drain line drains freely. Pour water  
into drain pan............................................................... [  
Trane  
A business of  
American Standard Companies  
Trane has a policy of continuous product and product data improvement and it reserves the right to change  
design and specifications without notice.  
18-BC62D1-1  
P.I. 9/06  
 

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