Trane 4TTX8024A Assembly instructions

18-AC95D1-1
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 informa-
tion pack upon completion of work.
Condensing Units
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.
4TTX8
Installer’s Guide
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

2 18-AC95D1-1
Section 1. Safety
▲
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 connec-
tion 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 cyl-
inders 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 “hygro-
scopic” 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.
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.
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.
▲
WARNING
!
▲
WARNING
!
LIVE ELECTRICAL COMPONENTS!
During installation, testing, servicing, and trouble-
shooting 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.
▲
WARNING
!
If using existing refrigerant lines make certain that all
joints are brazed, not soldered.
▲CAUTION
!
Scroll compressor dome temperatures may be hot. Do
not touch the top of compressor; it may cause minor to
severe burning.
▲CAUTION
!
▲
WARNING
!

18-AC95D1-1 3
Section 2. Unit Location Considerations
2.1 Unit Dimensions and Weight
2.2 Refrigerant Piping Limits
D
H
W
Unit Dimensions and Weight
Models H x D x W (in) Weight* (lb)
4TTX8024A 50 x 34 x 37 261
4TTX8036A 54 x 34 x 37 266
4TTX8048A 54 x 34 x 37 274
4TTX8060A 54 x 34 x 37 295
* Weight values are estimated.
25’
Max
Line
Lift
Standard
Line Set
60’ Max
Line Length
25’
Max
Line
Lift
35’ Max
Line
Length
35’ Max
Line
Length
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 twenty five (25) 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 revi-
sion).
* Restricted to maximum vertical change of 25 ft.
Table 2.1
*
*
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.
Please refer to application bulletin APP-
APG013-EN for detailed mounting information.

4 18-AC95D1-1
Min. 12” to
Shrubbery
Avoid Install
Near Bedrooms
Min 5’ Unrestricted
Access Panel
Min 3’
Unrestricted
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.
Do not locate close to bedrooms as operational
sounds may be objectionable.
Min. 12” to
Shrubbery Min. 12”
to Wall
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 falling directly on the unit.
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. Please
refer to Application Guide SS-APB006-EN: Trane - Sea Coast Applications and Seascoast Corrosion Protection
Bulletin UN-SVB11A-EN.

18-AC95D1-1 5
STEP 2 - To remove the unit from the pallet,
remove tabs by cutting with a sharp tool.
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.
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.
For other applications refer to Application Guide
APP-APG013-EN.

6 18-AC95D1-1
Section 5. Refrigerant Line Considerations
5.1 Refrigerant Line and Service Valve Connection Sizes
Line Sizes Service Valve Connection Sizes
Model Vapor
Line Liquid Line Vapor Line Connection Liquid Line Connection
4TTX8024A 5/8 3/8 5/8 3/8
4TTX8036A 3/4 3/8 3/4 3/8
4TTX8048A 7/8 3/8 7/8 3/8
4TTX8060A 1-1/8 3/8 1-1/8 3/8
Table 5.1
5.3 Required Refrigerant Line Length
5.2 Factory Charge
Line Length
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.
Vapor Line
Liquid Line
Insulation
Determine required line length and lift. You will
need this later in STEP 2 of Section 14.
Total Line Length = __________ Ft.
Total Vertical Change (lift) = __________ Ft.
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.

18-AC95D1-1 7
5.5 Reuse Existing Refrigerant Lines
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.
Important: For more information see publi-
cation numbers SS-APG006-EN and APP-
APG011-EN.
▲CAUTION
!
If using existing refrigerant lines make certain that
all joints are brazed, not soldered.
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.
Comply with National, State, and Local Codes when
isolating line sets from joists, rafters, walls, or other
structural elements.
Isolation From Joist/Rafter
Side View
8 Feet Maximum
Secure Vapor line from joists using isolators every 8 ft. Secure
Liquid Line directly to Vapor line using tape, wire, or other appro-
priate method every 8 ft.
Joist/Rafter
Isolator
Line Set
8 Feet Maximum

8 18-AC95D1-1
Isolation In Wall Spaces
Side View
Wall
Isolator
Line Set
8 Feet Maximum
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.
8 Feet Maximum
Isolation Through Wall DO NOT hang line sets from ductwork
Sealant
Insulation
Vapor Line
Wall
Ductwork
Isolator
Line Set
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.

18-AC95D1-1 9
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 re-
move 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.

10 18-AC95D1-1
STEP 5 - Replace the pressure tap valve cores
after the service valves have cooled.
STEP 2 - Check for leaks by using a soapy solu-
tion or bubbles at each brazed location.
Remove nitrogren pressure and repair any leaks
before continuing.
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.
150 PSIG

18-AC95D1-1 11
Section 9. Evacuation
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. 1 MIN.
Section 10. Service Valves
10.1 Open the Gas Service Valve
0350
Microns
ON OFF
CAP
1/4 TURN ONLY
COUNTERCLOCKWISE
FOR FULL OPEN
POSITION
VALVE STEM
GAS LINE CONNECTION
UNIT SIDE
OF VALVE
PRESSURE TAP PORT
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.

12 18-AC95D1-1
10.1 Open the Liquid Service Valve
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
Rolled Edge to
Captivate Stem
Hex Headed
Valve System
Service Port
3/16” Hex Wrench
Unit Side
of Service
Valve
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.
▲WARNING
!

18-AC95D1-1 13
11.2 Low Voltage Hook-up Diagrams
Red
Yellow
Brown
Green
White
Black
Purple
Blue
W1
B
W3
W2
G
Y2
Y1 Yellow
Yellow/Black
Brown Yellow/Red
Blue
Blue
R
Comfort Control
Variable Speed
Air Handler
Air Conditioner
W1
W2
W3
G
Y
B
O
BK
YLO
R
Neatly bundle all low voltage
wires behind the service
valve cover as shown.
Notes:
1. If electric heat does not have 3rd contactor (CH), connect a jumper wire
from W3 to W2. If electric heat does not have 2nd contactor (BH), connect a
jumper wire from W2 to W1.
2. Installer must remove the factory installed jumper between R and BK on the
air handler terminal strip.
3. Installer must add a field installed jumper between R and O on the air han-
dler terminal strip.
4. 4TTX8 units require 80% airflow with Y1 (low stage) and 100% airflow with
Y2 (high stage).
A) Connect Y1 from comfort control to Y at the VS air handler and to Y1
(yellow/black) at the AC.
B) Connect Y2 from comfort control to BK at the VS air handler and to Y2
(yellow/red) at the AC.
5. Comfort control may not have W2 or W3 terminals.
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.
4TEE3F31-66
Variable Speed Air Handler Hook-up
Diagram

14 18-AC95D1-1
Red
Yellow
Brown
Green
White
Black
Purple
Blue
Yellow
Yellow/Black
Brown Yellow/Red
Blue
Blue
W1
B
W3
W2
G
Y2
Y1
R
Comfort Control
Comm. Variable Speed
Furnace or Air Handler
Air Conditioner
W1
W2
W3
G
Y2
B
O
BK
D
Y1
R
Neatly bundle all low voltage
wires behind the service
valve cover as shown.
Notes:
1. See User Interface
setup menu for 24
VAC control mode
and cooling CFM
options.
2. First stage CFM
options for 4TTX8
are 65–80%.
3. W3 terminal may
not be present on
indoor unit.
4. Comfort control
may not have W2
or W3 terminals.
Comfort Control
Air Handler
Air Conditioner
Neatly bundle all low voltage
wires behind the service
valve cover as shown.
Yellow/Red
Field wiring
Yellow/Black
Blue
Red
Yellow
Green
White
Blue
BB - Blue
W
G
Y1
Brown
Y2 Y1 - Yellow
Y2 - Brown
R
OO
R
B
YI
W1
YO
Y2
DH/BK
G
W2
W3
(In)
(Out)
Communicating Indoor Unit
with 24 V Control Hook-up
Diagram
*AM7 Air Handler
Hook-up Diagram
1
1
12345
12345
HP
2(Compressor)
2(Stages)
AC (System)
}
OUTDOOR
Capacity (Tons)
OUTDOOR
}
Torque
CFM/Ton
Cool OffDelay
}
INDOOR
CFM
+12V
R13
R14
R1
R4
1
U1
RNET 1
S1
on
on
S2
RNET 2
R6
C22
C19
C15 C12
C18
C21
C10
D9
L1
R22
Must configure to
“ON” for AC Units.
Must configure to “ON” for
two-stage compressors.
Control Board

18-AC95D1-1 15
Notes:
1. Installer must cut the
factory R to BK jumper
on furnace circuit board.
OR, on new 15-digit
models, set the S5-2
DIP switch to OFF.
2. Installer must add a
field installed jumper
between R and O on the
furnace terminal strip
3. 4TTX8 units require
80% airflow with Y1 (low
stage) and 100% airflow
with Y2 (high stage).
A) Connect Y1 from
comfort control to
Y at the VS furnace
and to Y1 (yellow/
black) at the AC.
B) Connect Y2 from
comfort control to
BK at the VS furnace
and to Y2 (yellow/
red) at the AC.
4. Comfort control may not
have W2 or W3 termi-
nals.
5. If single stage heating
comfort control is used,
jumper W1 to W2 on the
furnace terminal strip.
Red
Yellow
Brown
Green
White
Black
Blue
W1
B
W2
G
Y2
Y1
R
Comfort Control
Variable Speed
Furnace
Air Conditioner
Yellow
Yellow/Black
Brown Yellow/Red
Blue
Blue
W1
W2
G
Y
B
O
BK
YLO
R
Neatly bundle all low voltage
wires behind the service
valve cover as shown.
Variable Speed Furnace
Hook-up Diagram

16 18-AC95D1-1
Section 12. Electrical - High Voltage
12.1 High Voltage Power Supply
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
12.3 High Voltage Ground
Ground the outdoor unit per national, state, and
local code requirements.
LIVE ELECTRICAL COMPONENTS!
During installation, testing, servicing, and
troubleshooting of this product, it may be nec-
essary to work with live electrical components.
Failure to follow all electrical safety precau-
tions when exposed to live electrical compo-
nents could result in death or serious injury.
▲
WARNING
!
Install a separate disconnect switch at the
outdoor unit.
For high voltage connections, flexible electri-
cal conduit is recommended whenever vibra-
tion transmission may create a noise problem
within the structure.

18-AC95D1-1 17
Section 13. Start Up
13.1 System Start Up
STEP 2 - Set System Thermostat to OFF.
STEP 3 - Turn on disconnect(s) to apply power
to the indoor and outdoor units.
STEP 5 - Set system thermostat to ON.
OFF
D
O
N
E
CANCEL
ON
OFF
STEP 4 - Wait one (1) hour before starting the
unit if compressor crankcase heater acces-
sory is used and the Outdoor Ambient is below
70ºF. 60 MIN.
STEP 1 - Ensure Sections 7 through 12 have
been completed.
ON
D
O
N
E
CANCEL

18 18-AC95D1-1
STEP 1 - Check the outdoor temperatures.
Subcooling (in cooling mode) is the only recom-
mended method of charging above 55º F ambi-
ent 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 tempera-
ture is above 55º F.
STEP 1 - Use the refrigerant line total length
and lift measurements from Section 5.3.
Total Line Length = __________ Ft.
Vertical Change (Lift) = __________ Ft.
Section 14. System Charge Adjustment
14.1 Temperature Measurements
14.2 Subcooling Charging in Cooling (Above 55º F Outdoor Temp.)
LIFT
Indoor Temp
80º F
70º F
Outdoor Temp
55º F
120º F

18-AC95D1-1 19
Design Subcooling Value = __________º F
(from nameplate or Service Facts)
Subcooling Correction = __________º F
Final Subcooling Value = __________º F
STEP 2 - Determine the final subcooling value using total Line Length and Lift measured in STEP 1 and the charts below.
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 mini-
mum of 20 minutes to stabilize before accurate
measurements can be made. 20 MIN.
2 Ton Unit
4 Ton Unit
3 Ton Unit
5 Ton Unit
60
50
40
30
25
20
15
10
0
10 20 25 30 40 60
25 ft. Maximum Lift
REFRIGERANT LINE LIFT (FT)
SUBCOOL CHARGING CHART CORRECTIONS TABLE
Add 2o
Add 3o
TOTAL REFRIGERANT LINE LENGTH (FT)
Use design subcooling
Add 1o
60
50
40
30
25
20
15
10
0Add 1o
10 20 25 30 40 60
25 ft. Maximum Lift
SUBCOOL CHARGING CHART CORRECTIONS TABLE
REFRIGERANT LINE LIFT (FT)
Add 3o
Add 2o
Add 1o
Use design subcooling
TOTAL REFRIGERANT LINE LENGTH (FT)
60
50
40
30
25 Add 3º Add 4º
20
15
10 Add 2º
0
10 20 25 30 40 60
REFRIGERANT LINE LIFT (FT)
SUBCOOL CHARGING CHART CORRECTIONS TABLE
25 ft. Maximum Lift
Add 1º
Use Design Subcooling
TOTAL REFRIGERANT LINE LENGTH (FT)
Add 3ºAdd 2º
60
50
40
30
25 Add 4º
20
15
10 Add 2º
0
10 20 25 30 40 60
REFRIGERANT LINE LIFT (FT)
SUBCOOL CHARGING CHART CORRECTIONS TABLE
TOTAL REFRIGERANT LINE LENGTH (FT)
Use Design Subcooling
Add 1º
Add 3º
25 ft. Maximum Lift
Add 2º

20 18-AC95D1-1
STEP 4 - Measure the liquid line temperature
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, refriger-
ant 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 ap-
proximately 327 PSI. (This is the shown as
the intersection of the Final Subcooling column
and the Liquid Temperature row.
Table 14.2
8910 11 12 13 14
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
R-410A REFRIGERANT CHARGING CHART
55
60
65
70
75
80
85
90
95
100
105
110
115
120
125
LIQUID
TEMP
(°F)
FINAL SUBCOOLING (°F)
LIQUID GAGE PRESSURE (PSI)
From Dwg. D154557P01 Rev.
3
107 °F