Trane 2TWR3, XR13 Installer's Manual

18-BC59D1-1

Installer’s Guide

Heat Pumps

2TWR3

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
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 information 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.

1

5 FT. ABOVE UNIT — UNRESTRICTED

A. GENERAL

!

WARNING

This information is intended for use by individuals posses­sing 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.

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.

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.

®

The Weathertron
manufactured to withstand and operate in severe winter
conditions. 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 recom-

mended 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.

Heat Pump has been designed and

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 the sides of the unit and should be of sufficient
distance from the unit to prevent restriction of airflow to
and from the unit. Also allow for proper maintenance
space. The barrier should be constructed of materials
which will blend in with the building design.

3. Avoid locating the unit where condensation and freezing
of defrost vapor may annoy the customer. For instance,
installing the unit under a bedroom, kitchen, or picture
window may be annoying to the customer since conden­sate and fog will occur during the defrost cycle.

4. Avoid locating the unit under the eaves or other over­head structures as sizeable icicles may form and the unit
may be damaged by these falling icicles.

B. LOCATION AND PREPARATION

OF THE UNIT

1. When removing unit from the pallet, notice the tabs on
the basepan. Remove tabs by cutting with a sharp tool as
shown on page 2, Figure 2, and slide unit off of pallet.

2. The unit should be set on a level support pad at least
as large as the unit base pan, such as a concrete slab.
If this is not the application used please refer to
application bulletin “Trane XR-APG**-EN” (* denotes
latest revision number).

3. The support pad must NOT be in direct contact with any
structure. Unit must be positioned a minimum of 12"

Installer’s Guide

2

from any wall or surrounding shrubbery to insure
adequate airflow. Clearance must be provided in front
of control box (access panels) and any other side
requiring service access to meet National Electrical
Code. Also, the unit location must be far enough away
from any structure to prevent excess roof run-off water
from pouring directly on the unit. Do not locate unit(s)
close to bedroom(s).

4. The top discharge area must be unrestricted for at least
five (5) feet above the unit.

5. When the outdoor unit is mounted on a roof, be sure the
roof will support the unit’s weight. Properly selected
isolation is recommended to prevent transmission to the
building structure.

6. The maximum length of refrigerant lines from outdoor
to indoor unit should NOT exceed sixty (60) feet.

7. If outdoor unit is mounted above the air handler, maxi­mum lift should not exceed sixty (60) feet (suction line). If
air handler is mounted above condensing unit, maxi­mum lift should not exceed sixty (60) feet (liquid line).

8. Locate and install indoor coil or air handler in accor­dance with instruction included with that unit.

BASEPAN TAB REMOVAL

NOTE:
Large diameter tubing will be very difficult to rebend once it
has been shaped.

3. Determine the best starting point for routing the refriger­ant tubing — INSIDE OR OUTSIDE THE STRUCTURE.

4. Provide a pull-thru hole of sufficient size to allow both
liquid and gas lines.

5. Be sure the tubing is of sufficient length.

6. Uncoil the tubing — do not kink or dent.

7. Route the tubing making all required bends and properly
secure the tubing before making connections.

8. To prevent a noise within the building structure due to
vibration transmission from the refrigerant lines, the
following precautions should be taken:

a. When the refrigerant lines have to be fastened to floor

joists or other framing in a structure, use isolation
type hangers.

b. Isolation hangers should also be used when refrigerant

lines are run in stud spaces or enclosed ceilings.

c. Where the refrigerant lines run through a wall or sill,

they should be insulated and isolated.

d. Isolate the lines from all ductwork.

D. SERVICE VALVE OPERATION

BRASS LIQUID AND GAS LINE SERVICE VALVES

The Brass Liquid and Gas Line Service Valves are factory
shipped in the seated position to hold factory charge. The
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).

C. INSTALLING REFRIGERANT LINES

!

CAUTION

If using existing refrigerant lines make certain that all
joints are brazed, not soldered.

Condensing units have provisions for braze connections.
Pressure taps are provided on the service valves of outdoor

unit for compressor suction and liquid pressures.
The indoor end of the recommended refrigerant line sets

may be straight or with a 90 degree bend, depending upon
situation requirements. This should be thoroughly checked
out before ordering refrigerant line sets.

The gas line must always be insulated.

!

CAUTION

In scroll compressor applications, dome temperatures
may be hot. Do not touch top of compressor, may cause
minor to severe burning.

The units are factory charged with the system charge
required when using fifteen (15) feet of rated connecting line.
Unit nameplate charge is the same.

Final refrigerant charge adjustment is necessary. Use
the Charging Information in the outdoor unit Service Facts
and on page 6.

1. Determine the most practical way to run the lines.

2. Consider types of bends to be made and space
limitations.

!

WARNING

Extreme caution should be exercised when opening the
Liquid and Gas Line Service Valves. Turn valve stem
counterclockwise only until the stem contacts the rolled
edge. (See Figures 3 and 5) No torque is required.

BRASS GAS LINE BALL SERVICE VALVE

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.

3

LIQUID LINE SERVICE VALVE

© 2005 American Standard Inc. All Rights Reserved 18-BC59D1-1

Installer’s Guide

4

GAS LINE BALL SERVICE VALVE

UNIT SIDE
OF VALVE

COOLING

CAP

PRESSURE TAP PORT

GAS LINE CONNECTION

CAP

CORE

1/4 TURN ONLY
COUNTERCLOCKWISE
FOR FULL OPEN
POSITION

VALVE STEM

BODY

HEATING

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.

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.

6. Precautions should be taken to avoid heat damage

to the pressure tap valve core during brazing. It is
recommended that the pressure tap port valve
core be removed and a wet rag wrapped around
the valve body.

NOTE:
Use care to make sure that no moisture enters pressure tap
port, while wet rag is being used.

NOTE:
Precautions should be taken to avoid heat damage to
basepan during brazing. It is recommended to keep the
flame directly off of the basepan.

7. Use a Dry Nitrogen Purge and Brazing Alloy without
flux when brazing the field line to the copper factory
connection. Flow dry nitrogen into either valve pressure
tap port, thru the tubing and out the other port while
brazing.

8. Braze using accepted good brazing techniques.

LEAK CHECK

IMPORTANT:

Replace pressure tap port valve core before attaching hoses for
evacuation.

5

GAS LINE SERVICE VALVE

other leak-checking methods to see that all field joints are
leak-free! If not, release pressure; then repair!

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.

NOTE:
Unnecessary switching of hoses can be avoided and com­plete evacuation of all lines leading to sealed system can be
accomplished with manifold center hose and connecting
branch hose to a cylinder of HCFC-22 and vacuum pump.

3. Attach center hose of manifold gauges to vacuum pump.

4. Evacuate until the micron gauge reads no higher than
350 microns.

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.

7. With vacuum pump and micron gauge blanked off,
open valve on HCFC-22 cylinder and charge refriger­ant lines and indoor coil with vapor to tank pressure
of HCFC-22 supply.

NOTE:
DO NOT VENT REFRIGERANT INTO THE ATMOSPHERE.

8. Close valve on HCFC-22 supply cylinder. Close valves on
manifold gauge set and remove refrigerant charging
hoses from liquid and gas pressure tap ports.

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.

After the brazing operation of refrigerant lines to both the
outdoor and indoor unit 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

18-BC59D1-1 3

9. 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)
observing WARNING statement on page 3. See Figure 3.

Installer’s Guide

FRC_DFT

TEST_COMMON

TST

10. 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.

11. 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 counterclock­wise, using 1/4" Open End or Adjustable wrench. See
Figure 4. For brass gas line service valve opening, follow
9 and 10 above. See Figure 5.

12. 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.

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 unit
Service Facts.

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.

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.

Table 1 — NEC Class II Control Wiring

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.

FAULT IDENTIFICATION

A fault condition is indicated by the flashing light on the
defrost control inside the heat pump control box.

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.)

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.)

DEFROST CONTROL CHECKOUT

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.

If a defrost control problem is suspected, refer to the service
information in control box.

!

WARNING

Do NOT connect 24V AC to T1 (ODS-A) terminal. ODS-A
thermistor WILL BE BLOWN.

6

PIN IDENTIFICATION

24 VOLTS

WIRE SIZE MAX. WIRE LENGTH

18 AWG 150 FT
16 AWG 225 FT.
14 AWG 300 FT.

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 instruc­tion 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 measurement is
representative of the operating state and relative capacity of

4 18-BC59D1-1

G. COMPRESSOR START UP

After all electrical wiring is complete, SET THE THERMO­STAT 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.

H. OPERATIONAL AND

CHECKOUT PROCEDURES

Final phases of this installation are the unit Operational and
Checkout Procedures which are found in this instruction on

Installer’s Guide

page 8. To obtain proper performance, all units must be
operated and charge adjustments made in accordance with
procedures found in the Service Facts.

I. ELECTRIC HEATERS

Electric heaters, if used, are to be installed in the air han­dling device according to the instructions accompanying the
air handler and the heaters.

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.

K. OUTDOOR THERMOSTAT

An outdoor thermostat TAYSTAT250B may be field installed.
For data, see wiring diagram attached to unit and instruction
sheet packaged with outdoor thermostat.

L. SEACOAST SALT SHIELD

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.

IMPORTANT:

See Limited Warranty information in Use and Care Manual.

M. TROUBLESHOOTING

TROUBLESHOOTING CHART — WHAT TO CHECK

WHAT TO CHECK MODE

HIGH VOLTAGE WIRING

COMPRESSOR IOL

SYSTEM FAULTS

REFRIGERANT CIRCUIT

Head Pressure Too High

Head Pressure Too Low

Suction Pressure Too High

Suction Pressure Too Low

Liquid Refrig. Floodback (TXV)

I.D. Coil Frosting

Compressor Runs
Inadequate or No Cooling/Htg

ELECTRICAL

Compressor & O.D. Fan
Won’t Start

Compressor Will Not Start
But O.D. Fan Runs

O.D. Fan Won’t Start

Compressor Hums But Won’t Start

Compressor Cycles on IOL

I.D. Blower Won’t Start

DEFROST

Unit Won’t Initiate Defrost

Defrost Terminates on Time

Unit Icing Up

C - Cooling H - Heating P - Primary Causes S - Secondary Causes * - 3 Phase Only

POWER SUPPLY

C
H
C
H
C
H
C
H
C
H
C
H
C
H

C
H
C
H
C
H
C
H
C
H
C
H

C
H
C
H
C
H

P
P

P
P

RUN CAPACITOR

P
P
P
P
P
P

P
P
P
P

CONTACTOR CONTACTS

START CAPACITOR

START RELAY

S

P

S

P
P
P
P
P

S

P

S

P

LOW VOLTAGE WIRING

S
S

S
S
S
S

CONTROL TRANSFORMER

STUCK COMPRESSOR

LOW VOLTAGE FUSE

INEFFICIENT COMP.

CONTACTOR COIL

THERMOSTAT

S

P

S

PPP

S

P

S

S

S

S

S
S
S

S

S

S

S

S

S

S

S

S

P

S

S

P

S

EXCESSIVE EVAP. LOAD

NONCONDENSABLES

REF. UNDERCHARGE

RES. O.D. AIRFLOW

REF. OVERCHARGE

P
P

P

S

P

S

P

S
S

P
P

P

P

S

P

S

P

P
P

P
P

P

P

S

P

P

P

S

P
S
S

P

P

O.D. AIR RECIRCULATION

TXV STUCK OPEN

P

S

P

S

P

S

P

S

S

S

S

S

S
S

S

S

S

S

S

S

S

REF. CIR. RESTRICTIONS

CHECK VALVE LEAKING

*

DEFROST RELAY DEF.

SOV COIL DEFECTIVE

RES. I.D. AIRFLOW

SOV LEAKING

SUPERHEAT

S
S

P

S

S

S

S

S

S

S

S

P

S

P

S

S

P

S

S

S
P
P

S

S

P

S

S

S

P

S

S

S

S

P

S

S

DEFROST CONTROL DEF.

S

P
P
P

S

P
P

S

S
S

P

P

PP

P

P

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.

18-BC59D1-1 5

LEGEND

FACTORY WIRING
FIELD WIRING

Installer’s Guide

SUBCOOLING CHARGING IN COOLING ABOVE 55°F OD AMBIENT

The Trane company has always recommended installing
Trane approved

All 13 SEER 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.

The following charging methods are therefore prescribed for
systems with indoor TXVs.

1. Subcooling (in the cooling mode) is the
method of charging above 55°F ambient temperatures.

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 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.

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 remove refrigerant to lower
the pressure. Again, wait 20 minutes for the system
conditions to stabilize before adjusting charge again.

8. When system is correctly charged, you can refer to
System Pressure Curves (in Service Facts) to verify
typical performance.

matched indoor and outdoor systems.

only recommended

R-22 SUBCOOLING CHARGING TABLE

LIQUID

TEMP.

(°F)

45 89 93 96 100
50 98 102 105 109
55 107 111 115 119
60 117 121 126 130
65 128 132 137 141
70 139 144 148 153
75 151 156 161 166
80 163 168 174 179
85 176 182 187 193
90 190 196 202 208

95 205 211 217 223
100 220 226 233 239
105 236 243 249 256
110 253 260 267 274
115 271 278 285 293
120 289 297 305 313
125 309 317 325 333

DESIGN SUBCOOLING VALUES (°F)

8101214

LIQUID LINE PRESSURE (psi)

SUBCOOL CHARGING TABLE CORRECTIONS FOR LINE LENGTH AND RISE

60
50
40
30
25

Add 5 psig to Subcool Charging Table Pressure

20
15
10

REFRIGERANT

LINE LIFT (FEET)

Subtract 5 psig from S.C. Table Pressure

0

Use Design Subcool Value from Table

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 recom­mended below 55°F outdoor ambient.

2. The only recommended method of charging at outdoor
ambients below 55°F, is to weigh in the charge
heating mode.

3. Use Nameplate charge plus standard charge adders for
line length.

6 18-BC59D1-1

in the

4. Check liquid line temperature and pressure (at the
OD valves) to obtain a minimum of 10°F subcooling.

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.

Installer’s Guide

2TWR3 OUTLINE DRAWING

NOTE: ALL DIMENSIONS ARE IN MM (INCHES).

MODELS BASE FIG. A B C D E F G H J K

2TWR3018A 2 2 832 (32-3/4) 724 (28-1/2) 651 (25-5/8) 5/8 1/4 137 (5-3/8) 65 (2-5/8) 210 (8-1/4) 57 (2-1/4) 457 (18)
2TWR3024A 2 1 832 (32-3/4) 724 (28-1/2) 651 (25-5/8) 5/8 5/16 143 (5-5/8) 65 (2-5/8) 210 (8-1/4) 57 (2-1/4) 457 (18)
2TWR3030A 3 2 933 (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)
2TWR3036A 4 1 943 (37-1/8) 946 (37-1/4) 870 (34-1/4) 7/8 3/8 152 (6) 98 (3-7/8) 219 (8-5/8) 86 (3-3/8) 508 (20)
2TWR3042A 4 1 1045 (41-1/8) 946 (37-1/4) 870 (34-1/4) 7/8 3/8 152 (6) 98 (3-7/8) 219 (8-5/8) 86 (3-3/8) 508 (20)
2TWR3048A 4 1 1045 (41-1/8) 946 (37-1/4) 870 (34-1/4) 1-1/8 3/8 152 (6) 98 (3-7/8) 219 (8-5/8) 86 (3-3/8) 508 (20)
2TWR3060A 4 1 1045 (41-1/8) 946 (37-1/4) 870 (34-1/4) 1-1/8 3/8 152 (6) 98 (3-7/8) 219 (8-5/8) 86 (3-3/8) 508 (20)

18-BC59D1-1 7

From Dwg. 21D152898 Rev. 10

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. 21D152637 Rev. 1

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 ........... [ ]

3. Have all Refrigerant Lines been secured and

isolated properly? ........................................................ [ ]

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 .................................................. [ ]

7. Indoor coil drain line drains freely. Pour water

into drain pan .............................................................. [ ]

8. Supply registers and return grilles open and

unobstructed................................................................ [ ]

9. Return air filter installed ............................................ [ ]

10. Thermostat thermometer is accurate. Check
against a reliable thermometer. Adjust per

instructions with thermostat ...................................... [ ]

11. Is correct speed tap being used?

(Indoor blower motor) .................................................. [ ]

12. Operate complete system in each mode to

insure safe operation. .................................................. [ ]

Trane
A business of
American Standard Companies
www.trane.com

Trane has a policy of continuous product and product data improvement and it reserves the right to change
design and specifications without notice.

P.I. 10/05