Trane 4TTR3018H, 4TTR3024H, 4TTR3030G, 4TTR3036G, 4TTR3042D Installer's Manual

18-AC79D1-6-EN

Installer’s Guide

Condensing Units

4TTR3018–060

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 or provide for every possible contingency to be met in connection with
the installation. 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.

Note: The manufacturer recommends installing only approved matched indoor and outdoor systems. All of the manufacture’s split
systems are A.H.R.I. rated only with TXV/EEV indoor systems. Some of the benefits of installing approved matched indoor and
outdoor split systems are maximum efficiency, optimum performance and the best overall system reliability.

Table of Contents

Section 1. Safety ..................................................................................... 2

Section 2. Unit Location Considerations..............................................3

Section 3. Unit Preparation .................................................................... 5

Section 4. Setting the Unit ..................................................................... 5

Section 5. Refrigerant Line Considerations ......................................... 6

Section 6. Refrigerant Line Routing ..................................................... 7

Section 7. Refrigerant Line Brazing ...................................................... 8

Section 8. Refrigerant Line Leak Check .............................................10

Section 9. Evacuation ...........................................................................11

Section 10. Service Valves ................................................................... 11

Section 11. Electrical - Low Voltage .................................................... 13

Section 12. Electrical - High Voltage ................................................... 16

Section 13. Start Up .............................................................................. 17

Section 14. System Charge Adjustment ............................................. 18

Section 15. Checkout Procedures and Troubleshooting ................... 22

Section 1. Safety

▲

WARNING

!

▲

WARNING

!

▲

WARNING

!

▲

WARNING

!

▲

CAUTION

!

▲

CAUTION

!

▲

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 manufacture or seller
cannot be responsible for the interpretation of this
information, nor can it assume any liability in connec­tion with its use.

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 refrigerant 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
Bulletins SS-APG006-EN and APP-APG011-EN or
APP-APG012-EN.

LIVE ELECTRICAL COMPONENTS!
During installation, testing, servicing, and trouble­shooting of this product, it may be necessary to work
with live electrical components. Failure to follow all
electrical safety precautions when exposed to live
electrical components could result in death or serious
injury.

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

Scroll compressor dome temperatures may be hot. Do
not touch the top of compressor; it may cause minor to
severe burning.

UNIT CONTAINS R-410A REFRIGERANT!
R-410A operating pressures exceed the limit of R-22.
Proper service equipment is required. Failure to use
proper service tools may result in equipment damage
or personal injury.

SERVICE

USE ONLY R-410A REFRIGERANT AND AP-

PROVED POE COMPRESSOR OIL.

Extreme caution should be exercised when opening
the Liquid Line Service Valve. Turn counterclockwise
until the valve stem just touches the rolled edge. No
torque is required. Failure to follow this warning will
result in abrupt release of system charge and may
result in personal injury and /or property damage.

2 18-AC79D1-6-EN

Section 2. Unit Location Considerations

D

H

W

2.1 Unit Dimensions and Weight

Table 2.1

Unit Dimensions and Weight

Models H x D x W (in)

4TTR3018H

4TTR3024H

4TTR3030G

4TTR3036G

4TTR3042D

4TTR3048D

4TTR3060D

* Weight values are estimated.

29 x 26 x 29 133

29 x 26 x 29 130

29 x 30 x 33 153

29 x 30 x 33 159

29 x 34 x 37 196

29 x 34 x 37 203

37 x 34 x 37 226

When mounting the outdoor unit on a roof, be
sure the roof will support the unit’s weight.

Properly selected isolation is recommended to
alleviate sound or vibration transmission to the
building structure.

Weight* (lb)

2.2 Refrigerant Piping Limits

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

2. The maximum vertical change should not
exceed sixty (60) feet.

3. Service valve connection diameters are
shown in Table 5.1.

Note: For line lengths greater than sixty (60)
feet, Refer to Refrigerant Piping Application
Guide, SS-APG006-EN or Refrigerant Piping
Software Program, 32-3312-03 (or latest revi­sion).

Standard
Line Set

60’ Max

Line Length

60’

Max
Vertical
Change

18-AC79D1-6-EN 3

60’

Max
Vertical
Change

2.3 Suggested Locations for Best Reliability

Ensure the top discharge area is unrestricted for
at least five (5) feet above the unit.

Three (3) feet clearance must be provided in
front of the control box (access panels) and any
other side requiring service.

s

Min 5’ Unrestricted

Do not locate close to bedrooms as operational
sounds may be objectionable.

Position the outdoor unit a minimum of 12” from
any wall or surrounding shrubbery to ensure
adequate airflow.

Outdoor unit location must be far enough away
from any structure to prevent excess roof runoff
water from pouring directly on the unit.

y

Min. 12” to
Shrubbery

Min 3’
Unrestricted

Access Panel

Min. 12”
to Wall

2.4 Coastal Considerations

If installed within one mile of salt water, including seacoasts and inland waterways, models without factory sup­plied Seacoast Salt Shields require the addition of BAYSEAC001 (Seacoast Kit) at installation time.

Section 3. Unit Preparation

3.1 Prepare The Unit For Installation

STEP 1 - Check for damage and report prompt-

ly to the carrier any damage found to the unit.

STEP 2 - To remove the unit from the pallet,
remove tabs by cutting with a sharp tool.

4 18-AC79D1-6-EN

Section 4. Setting the Unit

4.1 Pad Installation

When installing the unit on a support pad, such
as a concrete slab, consider the following:

• The pad should be at least 1” larger than the

unit on all sides.

• The pad must be separate from any structure.

• The pad must be level.

• The pad should be high enough above grade

to allow for drainage.

• The pad location must comply with National,

State, and Local codes.

Section 5. Refrigerant Line Considerations

5.1 Refrigerant Line and Service Valve Connection Sizes

Table 5.1

Line Sizes Service Valve Connection Sizes

Model

4TTR3018H

4TTR3024H

4TTR3030G

4TTR3036G

4TTR3042D

4TTR3048D

4TTR3060D

Vapor

Line

3/4 3/8 3/4 3/8

3/4 3/8 3/4 3/8

3/4 3/8 3/4 3/8

3/4 3/8 3/4 3/8

3/4 3/8 3/4 3/8

7/8 3/8 7/8 3/8

7/8 3/8 7/8 3/8

Liquid

Line

Vapor Line

Connection

Liquid Line

Connection

5.2 Factory Charge

Trane outdoor condensing units are factory charged with the system charge required for the outdoor condensing
unit, fifteen (15) feet of tested connecting line, and the smallest indoor evaporative coil match. If connecting line

length exceeds fifteen (15) feet and/or a larger indoor evaporative coil is installed, then final refrigerant
charge adjustment is necessary.

5.3 Required Refrigerant Line Length

Determine required line length and lift. You will
need this later in STEP 2 of Section 14.

Total Line Length = __________ Ft.

Line Length

Total Vertical Change (lift) = __________ Ft.

18-AC79D1-6-EN 5

▲

CAUTION

!

5.4 Refrigerant Line Insulation

Important: The Vapor Line must always be
insulated. DO NOT allow the Liquid Line and
Vapor Line to come in direct (metal to metal)
contact.

5.5 Reuse Existing Refrigerant Lines

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

For retrofit applications, where the existing
indoor evaporator coil and/or refrigerant lines
will be used, the following precautions should
be taken:

• Ensure that the indoor evaporator coil and

refrigerant lines are the correct size.

• Ensure that the refrigerant lines are free of

leaks, acid, and oil.

Liquid Line

Vapor Line

Insulation

Important: For more information see publica­tion number SS-APG006-EN.

Section 6. Refrigerant Line Routing

6.1 Precautions

Important: Take precautions to prevent noise
within the building structure due to vibration
transmission from the refrigerant lines.

For Example:

• When the refrigerant lines have to be fastened to floor joists or other framing in a structure, use isolation type

hangers.

• Isolation hangers should also be used when refrigerant lines are run in stud spaces or enclosed ceilings.

• Where the refrigerant lines run through a wall or sill, they should be insulated and isolated.

• Isolate the lines from all ductwork. • Minimize the number of 90º turns.

8 Feet Maximum

Comply with National, State, and Local Codes when
isolating line sets from joists, rafters, walls, or other
structural elements.

Joist/Rafter

Isolator

Side View

Secure Vapor line from joists using isolators every 8 ft. Secure
Liquid Line directly to Vapor line using tape, wire, or other appro­priate method every 8 ft.

6 18-AC79D1-6-EN

8 Feet Maximum

Isolation From Joist/Rafter

Line Set

8 Feet Maximum

Wall

Isolator

Wall

Side View

8 Feet Maximum

Line Set

Secure Vapor Line using isolators every 8 ft. Secure Liquid Line
directly to Vapor Line using tape, wire, or other appropriate
method every 8 ft.

Isolation In Wall Spaces

Sealant

Ductwork

Insulation

Vapor Line

Isolator

Line Set

Isolation Through Wall

Section 7. Refrigerant Line Brazing

7.1 Braze The Refrigerant Lines

STEP 1 - Remove caps or plugs. Use a debur-

ing tool to debur the pipe ends. Clean both
internal and external surfaces of the tubing
using an emery cloth.

DO NOT hang line sets from ductwork

18-AC79D1-6-EN 7

STEP 2 - Remove the pressure tap cap and
valve cores from both service valves.

STEP 3 - Purge the refrigerant lines and indoor
coil with dry nitrogen.

STEP 4 - Wrap a wet rag around the valve
body to avoid heat damage and continue the
dry nitrogen purge.

Braze the refrigerant lines to the service
valves.

Continue the dry nitrogen purge. Do not re­move the wet rag until all brazing is completed.

Important: Remove the wet rag before stopping
the dry nitrogen purge.

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

8 18-AC79D1-6-EN

STEP 5 - Replace the pressure tap valve cores

150 PSIG

after the service valves have cooled.

Section 8. Refrigerant Line Leak Check

8.1 Check For Leaks

STEP 1 - Pressurize the refrigerant lines and

evaporator coil to 150 PSIG using dry nitrogen.

STEP 2 - Check for leaks by using a soapy solu­tion or bubbles at each brazed location.

Remove nitrogren pressure and repair any leaks
before continuing.

18-AC79D1-6-EN 9

Section 9. Evacuation

1/4 TURN ONLY

9.1 Evacuate the Refrigerant Lines and Indoor Coil

Important: Do not open the service valves until
the refrigerant lines and indoor coil leak check
and evacuation are complete.

STEP 1 - Evacuate until the micron gauge reads
no higher than 350 microns, then close off the
valve to the vacuum pump.

STEP 2 - Observe the micron gauge. Evacuation
is complete if the micron gauge does not rise
above 500 microns in one (1) minute.

Once evacuation is complete blank off the
vacuum pump and micron gauge, and close the
valves on the manifold gauge set.

0350

Microns

ON

OFF

1 MIN.

Section 10. Service Valves

10.1 Open the Gas Service Valve

Important: Leak check and evacuation must be
completed before opening the service valves.

NOTE: Do not vent refrigerant gases into the
atmosphere

STEP 1 - Remove valve stem cap.

STEP 2 - Using an adjustable wrench, turn valve

stem 1/4 turn counterclockwise to the fully open
position.

STEP 3 - Replace the valve stem cap to prevent
leaks. Tighten finger tight plus an additional 1/6
turn.

CAP

UNIT SIDE
OF VALVE

PRESSURE TAP PORT

COUNTERCLOCKWISE
FOR FULL OPEN
POSITION

VALVE STEM

GAS LINE CONNECTION

10 18-AC79D1-6-EN

10.1 Open the Liquid Service Valve

▲

WARNING

!

Extreme caution should be exercised when
opening the Liquid Line Service Valve. Turn
counterclockwise until the valve stem just
touches the rolled edge. No torque is required.
Failure to follow this warning will result in abrupt
release of system charge and may result in
personal injury and /or property damage.

Important: Leak check and evacuation must be
completed before opening the service valves.

STEP 1 - Remove service valve cap.

STEP 2 - Fully insert 3/16” hex wrench into the

stem and back out counterclockwise until valve
stem just touches the rolled edge (approximately
five (5) turns.)

STEP 3 - Replace the valve cap to prevent leaks.
Tighten finger tight plus an additional 1/6 turn.

Cap

Unit Side

of Service

Valve

Service Port

3/16” Hex Wrench

Rolled Edge to

Captivate Stem

Hex Headed

Valve System

Section 11. Electrical - Low Voltage

11.1 Low Voltage Maximum Wire Length

Table 11.1 defines the maximum total length of
low voltage wiring from the outdoor unit, to the
indoor unit, and to the thermostat.

Table 11.1

24 VOLTS

WIRE SIZE MAX. WIRE LENGTH

18 AWG 150 Ft.

16 AWG 225 Ft.

14 AWG 300 Ft.

18-AC79D1-6-EN 11

11.2 Low Voltage Hook-up Diagrams

With TEM 3, 4, 6With TAM 4, 5, 7

Thermostat Air Handler

24 VAC HOT

FAN

R

G

R

G

Outdoor

Unit

Thermostat Air Handler

24 VAC HOT

FAN

R

G

R

G

**

24 VAC
Common

SOV

COOL/HEAT
1st STAGE

B/C

Y

B

Blue

O

Y1

B

Y

Y2*

HEATING
2nd STAGE

EMERGENCY
HEAT

• Units with pigtails require wirenuts for connections. Cap all unused wires.

• For any BK enabled comfort control, do not connect Y1 or Y2 at the air handler.
In AC systems for multiple stages of electric heat, jumper W1 and W2 together if comfort control has only one stage of heat.

•

* Y for TEM3 and TEM4
** Only applies for TEM6

W1

W2

W1

White

W2

Pink

BK

WH/BLK

24 VAC
Common

SOV

COOL/HEAT
1st STAGE

HEATING
2nd STAGE

EMERGENCY
HEAT

B/C

Y

l

W1

W2

B

Blue

O

Y

l

Y

O

W1

White

W2

Pink

BK

WH/BLK

Outdoor

Unit

B

Y

O

12 18-AC79D1-6-EN

Section 12. Electrical - High Voltage

▲

WARNING

!

12.1 High Voltage Power Supply

LIVE ELECTRICAL COMPONENTS!
During installation, testing, servicing, and
troubleshooting of this product, it may be nec­essary to work with live electrical components.
Failure to follow all electrical safety precau­tions when exposed to live electrical compo­nents could result in death or serious injury.

The high voltage power supply must agree with
the equipment nameplate.

Power wiring must comply with national, state,
and local codes.

Follow instructions on unit wiring diagram located
on the inside of the control box cover and in the
Service Facts document included with the unit.

12.2 High Voltage Disconnect Switch

Install a separate disconnect switch at the
outdoor unit.

For high voltage connections, flexible electri­cal conduit is recommended whenever vibra­tion transmission may create a noise problem
within the structure.

12.3 High Voltage Ground

Ground the outdoor unit per national, state, and
local code requirements.

18-AC79D1-6-EN 13

Section 13. Start Up

OFF

DON

E

CANCEL

ON

OFF

E

13.1 System Start Up

STEP 1 - Ensure Sections 7 through 12 have

been completed.

STEP 2 - Set System Thermostat to OFF.

STEP 3 - Turn on disconnect(s) to apply power

to the indoor and outdoor units.

STEP 4 - Wait one (1) hour before starting the
unit if compressor crankcase heater acces­sory is used and the Outdoor Ambient is below
70ºF.

STEP 5 - Set system thermostat to ON.

60 MIN.

ON

DON

CANCEL

14 18-AC79D1-6-EN

Section 14. System Charge Adjustment

14.1 Temperature Measurements

STEP 1 - Check the outdoor temperatures.

Subcooling (in cooling mode) is the only recom­mended method of charging above 55º F ambi­ent outdoor temperature.

For best results the indoor temperature should
be kept between 70º F to 80º F.

Note: It is important to return in the spring or
summer to accurately charge the system in the
cooling mode when outdoor ambient tempera­ture is above 55º F.

120º F

55º F

Outdoor Temp

80º F

70º F

Indoor Temp

14.2 Subcooling Charging in Cooling (Above 55º F Outdoor Temp.)

STEP 1 - Use the refrigerant line total length

and lift measurements from Section 5.3.

Total Line Length = __________ Ft.

Vertical Change (Lift) = __________ Ft.

LIFT

18-AC79D1-6-EN 15

STEP 2 -

Determine the final subcooling value using total Line Length and Lift measured in STEP 1 and the charts below.

1 1/2 Ton

SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)

60

50

40

30

25

20

15

10

0

REFRIGERANT LINE LIFT (FEET)

10 20 25 30 40 60

TOTAL REFRIGERANT LINE LENGTH (FEET)

Use Design Subcool Value

Add 1° of Subcooling

Add 3°

Add 2°

2 1/2 Ton

SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)

60

50

40

30

25

20

15

10

0

REFRIGERANT LINE LIFT (FEET)

10 20 25 30 40 60

TOTAL REFRIGERANT LINE LENGTH (FEET)

Use Design Subcool Value

Add 2° of Subcooling

Add 1° of Subcooling

Add 4°

Add 3°

3 1/2 Ton

SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)

60

50

40

30

25

20

15

10

0

REFRIGERANT LINE LIFT (FEET)

10 20 25 30 40 60

TOTAL REFRIGERANT LINE LENGTH (FEET)

Add 1° of Subcooling

Use Design Subcool Value

Add 3° of Subcooling

Add 2° of Subcooling

Add 6°

Add 5°

2 Ton

SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)

60

50

40

30

25

20

15

10

0

REFRIGERANT LINE LIFT (FEET)

10 20 25 30 40 60

TOTAL REFRIGERANT LINE LENGTH (FEET)

Use Design Subcool Value

Add 1° of Subcooling

Add 4°

Add 2°

3 Ton

SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)

60

50

40

30

25

20

15

10

0

REFRIGERANT LINE LIFT (FEET)

10 20 25 30 40 60

TOTAL REFRIGERANT LINE LENGTH (FEET)

Use Design Subcool Value

Add 3° of Subcooling

Add 1° of Subcooling

Add 5°

Add 4°

Add 2°

4 Ton

SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)

60

50

40

30

25

20

15

10

0

REFRIGERANT LINE LIFT (FEET)

10 20 25 30 40 60

TOTAL REFRIGERANT LINE LENGTH (FEET)

Add 1° of Subcooling

Use Design Subcool Value

Add 4° of Subcooling

Add 3° of Subcooling

Add 2° of Subcooling

Add 6°

5 Ton

SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)

60

50

40

30

25

20

15

10

Design

0

REFRIGERANT LINE LIFT (FEET)

10 20 25 30 40 60

TOTAL REFRIGERANT LINE LENGTH (FEET)

Add 2° of Subcooling

Add 1° of Subcooling

Add 5° of Subcooling

Add 4° of Subcooling

Add 3° of Subcooling

Add 6°

STEP 3 - Stabilize the system by operating for a
minimum of 20 minutes.

At startup, or whenever charge is removed or
added, the system must be operated for a mini­mum of 20 minutes to stabilize before accurate
measurements can be made.

Design Subcooling Value = __________º F

(from nameplate or Service Facts)

Subcooling Correction = __________º F

Final Subcooling Value = __________º F

20 MIN.

16 18-AC79D1-6-EN

STEP 4 - Measure the liquid line temperature

3

and pressure at the outdoor unit’s service valve.

Measured Liquid Line Temp = __________ º F

Liquid Gage Pressure = __________ PSI

Final Subcooling Value = __________ º F

STEP 5 - Use the final subcooling value, refriger­ant temperature and pressure from STEP 4, to
determine the proper liquid gage pressure using
Table 14.2.

Example: Assume a 12º F Final Subcooling

value and liquid temp of 90º F.

1. Locate 12º F Final Subcooling in Table 14.2.

2. Locate the Liquid Temperarature (90º F) in
the left column.

3. The Liquid Gage Pressure should be ap­proximately 327 PSI. (This is the shown as
the intersection of the Final Subcooling column
and the Liquid Temperature row.

Table 14.2

R-410A REFRIGERANT CHARGING CHART

LIQUID

TEMP

F)

(

°

55

60

65

70

75

80

85

90

95

100

105

110

115

120

125

FINAL SUBCOOLING (

8910 11 12 13 14

LIQUID GAGE PRESSURE (PSI)

179 182 185 188 191 195 198

195 198 201 204 208 211 215

211 215 218 222 225 229 232

229 232 236 240 243 247 251

247 251 255 259 263 267 271

267 271 275 279 283 287 291

287 291 296 300 304 309 313

309 313 318 322 327 331 336

331 336 341 346 351 355 360

355 360 365 370 376 381 386

381 386 391 396 402 407 413

407 413 418 424 429 435 441

435 441 446 452 458 464 470

464 470 476 482 488 495 501

495 501 507 514 520 527 533

From Dwg. D154557P01 Rev.

°

107 °F

F)

18-AC79D1-6-EN 17

STEP 6 - Adjust refrigerant level to attain

PRESSURE CURVES FOR 4TTR3036D1000A

4TXCB036BC3

Cooling with Thermal Expansion Valve

LIQUID PRESSURE (PSIG)

OUTDOOR TEMPERATURE (Degree F)

SUCTION PRESSURE (PSIG)

100

105

110

115

120

125

130

135

140

145

150

155

160

165

170

40 50 60 70 80 90 100 110 120

200

250

300

350

400

450

500

550

40 50 60 70 80 90 100 110 120

(1)

(1)

(3)

(3)

(5)

(4)

(2)

(2)

INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.

INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.

proper gage pressure.

Add refrigerant if the Liquid Gage Pressure
is lower than the chart value.

1. Connect gages to refrigerant bottle
and unit as illustrated.

2. Purge all hoses.

3. Open bottle.

4. Stop adding refrigerant when liquid
line temperature and Liquid Gage
Pressure matches the charging chart
Final Subcooling value.

Recover refrigerant if the Liquid Gage Pres­sure is higher than the chart value.

STEP 7 - Stabilize the system.

1. Wait 20 minutes for the system condi­tion to stabilize between adjustments.

Note: When the Liquid Line Temperature and
Gage Pressure approximately match the chart,
the system is properly charged.

2. Remove gages.

3. Replace service port caps to prevent
leaks. Tighten finger tight plus an ad­ditional 1/6 turn.

STEP 8 - Verify typical performance.

Refer to System Pressure Tables in the Service
Facts to verify typical performance.

18 18-AC79D1-6-EN

20 MIN.

(Example only - see Service Facts)

STEP 9 - Record System Information for refer­ence.

Record system pressures and temperatures
after charging is complete.

Outdoor model number = _________________

Measured Outdoor Ambient = __________ º F

Measured Indoor Ambient = __________ º F

Measured Suction Line Temp = __________ º F

Liquid Gage Pressure = __________ PSI

Suction Gage Pressure = __________ PSI

Measured Liquid Line Temp = __________ º F

Section 15. Checkout Procedures and Troubleshooting

15.1 Operational And Checkout Procedures

Final phases of this installation are the unit Operational and Checkout Procedures. To obtain proper performance, all units
must be operated and charge adjustments made.

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 properly
secured.

CHECKOUT PROCEDURE

After installation has been completed, it is recommended that the entire system be checked against the following list:

1. Leak check refrigerant lines. ........................................ [ ]

2. Properly insulate suction lines and fittings. ................... [ ]

3. Properly secure and isolate all refrigerant lines. ........... [ ]

4. Seal passages through masonry.
If mortar is used, prevent mortar from coming

into direct contact with copper tubing. .......................... [ ]

5. Verify that all electrical connections are tight. ............... [ ]

6. Observe outdoor fan during on cycle for clearance

and smooth operation. .................................................. [ ]

7. Be sure that indoor coil drain line drains freely. Pour water

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

8. Be sure that supply registers and return grilles are open

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

9. Be sure that a return air filter is installed. ..................... [ ]

10. Be sure that the correct airflow setting is used.

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

11. Operate complete system in each mode to

ensure safe operation. .................................................. [ ]

18-AC79D1-6-EN 19

PP

15.2 Troubleshooting

WHAT TO CHEC K MODE

SYSTEM FAULTS

REFRIGERANT CIRCUIT

Head Pressure Too High

Head Pressure Too Low

Suction Pressure Too High

Suction Pressure Too Low

Liquid Refrig. Floodback (TXV/EEV)

Liquid Refrig. Floodback
(Cap. Tube)

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 Star t

DEFROST

Unit Won’t Initiate Defrost

Defrost Terminates on Time

Unit Icing Up

HIG H VOLTAGE WIRI NG

COM PRES SOR I OL

POWE R SUP PLY

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

C

H

P

P

P

P

START CA PACITOR

RUN C APACITO R

P

P

P

S

P

S

P

P

P

S

P

S

P

P

CON TROL T RANS FORM ER

CON TACTOR CONTACTS

LOW VOLTAGE WIRI NG

START RE LAY

S

S

P

S

S

P

P

P

S

S

P

S

S

P

S

S

P

S

S

P

REF. UNDER CHAR GE

INE FFIC IENT COMP.

P

P

P

P

P

P

P

S

S

EXC ESSI VE EVAP. LOAD

REF. OVERCH ARGE

S

S

S

S

S

S

S

S

STU CK CO MPRE SSOR

LOW VOLTAGE FU SE

CON TACTOR COIL

THE RMOS TAT

S

P

S

S

S

S

S

S

S

S

S

S

S

S

PPP

P

S

P

S

P

S

NON COND ENSA BLES

RES. O.D. AIRF LOW

P

P

P

P

P

P

P

P

P

P

P

P

P

P

P

P

P

P

O.D. AIR R ECIR CULATIO N

TXV /EEV STUCK OPEN

P

S

P

P

S

P

S

S

S

S

S

S

S

S

S

S

S

S

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

REF. CIR. RES TRIC TION S

RES. I.D. AIRFL OW

SUP ERHE AT

S

S

S

S

P

P

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

CHE CK VALVE LE AKIN G

*

SOV CO IL DE FECT IVE

SOV LE AKIN G

S

P

S

S

S

P

S

S

P

P

S

P

S

P

S

DEF ROST CONTR OL DEF.

DEF ROST RELAY DEF.

S

S

S

P

P

S

S

S

S

S

S

S

P

P

P

P

P

P

P

S

S

P

P

6200 Troup Highway
Tyler, TX 75707
www.trane.com

20 18-AC79D1-6-EN

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

Representative-only illustrations included in this document.

© 2014 Trane U.S.,Inc. 12/14