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
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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
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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
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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
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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
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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
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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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