Trane A4AC4018A Assembly instructions

Installer’s Guide
August 2021 88-A4AC4001-1G-EN
SAFETY WARNING
Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating,
and air-conditioning equipment can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or
altered equipment by an unqualified person could result in death or serious injury. When working on the equipment, observe all pre-
cautions in the literature and on the tags, stickers, and labels that are attached to the equipment.
Models
A4AC4018A
A4AC4023A
A4AC4024A
A4AC4030A
A4AC4036A
A4AC4042A
A4AC4048A
A4AC4060A
Note: “Graphics in this document are for representation only.
Actual model may differ in appearance.”
Condensing Units

2 88-A4AC4001-1G-EN
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
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 sys-
tem. 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.
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
!
WARNING!
This product can expose you to chemicals including lead,
which are known to the State of California to cause cancer
and birth defects or other reproductive harm. For more
information go to www.P65Warnings.ca.gov
WARNING
!
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 connec-
tion with the installation. Should further information be desired
Note: The manufacturer recommends installing only approved
matched indoor and outdoor systems. All of the manufacture’s
split systems are AHRI rated with Piston/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.
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.

88-A4AC4001-1G-EN 3
Table of Contents
Section 1. Safety............................................................................................................................................................ 2
Section 2. Unit Location Considerations .................................................................................................................... 4
Section 3. Unit Preparation........................................................................................................................................... 5
Section 4. Setting the Unit............................................................................................................................................ 6
Section 5. Refrigerant Line Considerations................................................................................................................ 6
Section 6. Refrigerant Line Routing ............................................................................................................................ 8
Section 7. Refrigerant Line Brazing............................................................................................................................. 9
Section 8. Refrigerant Line Leak Check.................................................................................................................... 11
Section 9. Evacuation ................................................................................................................................................. 11
Section 10. Service Valves ......................................................................................................................................... 12
Section 11. Electrical - Low Voltage .......................................................................................................................... 13
Section 12. Electrical - High Voltage ......................................................................................................................... 15
Section 13. Start Up..................................................................................................................................................... 16
Section 14. System Charge Adjustment (Systems can be rated with TXV, EEV or Piston) ................................. 17
Section 15. Checkout Procedures and Troubleshooting......................................................................................... 22
Section 16. Refrigerant Circuits................................................................................................................................. 25

4 88-A4AC4001-1G-EN
Table 2.1
Section 2. Unit Location Considerations
2.1 Unit Dimensions and Weight
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 revi-
sion).
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.
D
W
H
60’
Max
Vertical
Change
Standard
Line Set
60’ Max
Line Length
60’
Max
Vertical
Change
Unit Dimensions and Weight
Models H x D x W (in) Weight* (lb)
A4AC4018A 28.6 x 23.6 x 23.6 130
A4AC4023A 32.6 x 23.6 x 23.6 130
A4AC4024A 28.6 x 25.6 x 25.6 134
A4AC4030A 28.6 x 29.8 x 29.8 163
A4AC4036A 32.6 x 29.8 x 29.8 161
A4AC4042A 28.6 x 34.3 x 34.3 159
A4AC4048A 28.6 x 34.3 x 34.3 159
A4AC4060A 36.6 x 34.3 x 34.3 220
* Weight values are estimated.

88-A4AC4001-1G-EN 5
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.
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.
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.
Min. 12” to
Shrubbery
Avoid Install
Near Bedrooms
Min 5’ Unrestricted
Access Panel
Min 3’
Unrestricted
Min. 12” to
Shrubbery
Min. 12”
to Wall

6 88-A4AC4001-1G-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 Vapor
Line
Liquid
Line
Vapor Line
Connection
Liquid Line
Connection
A4AC4018A
3/4 3/8 3/4 3/8
A4AC4023A
3/4 3/8 3/4 3/8
A4AC4024A
3/4 3/8 3/4 3/8
A4AC4030A
3/4 3/8 3/4 3/8
A4AC4036A
3/4 3/8 3/4 3/8
A4AC4042A
7/8 3/8 7/8 3/8
A4AC4048A
7/8 3/8 7/8 3/8
A4AC4060A
7/8 3/8 7/8 3/8
5.2 Factory Charge
The outdoor condensing units are factory
charged with the system charge required for the
outdoor condensing unit, ten (10) feet of tested
connecting line, and the smallest rated indoor
evaporative coil match. Always verify proper
system charge via subcooling (TXV/EEV) or
superheat (fixed orifice) per the unit nameplate.
TUBING INFORMATION
LINE TYPE REFRIGERANT TO ADD AT SPECIFIED
ADDITIONAL LENGTH
Suction
Line
Liquid
Line 20 ft 30 ft 40 ft 50 ft 60 ft
3/4” 3/8" 3 oz 9 oz 15 oz 21 oz 27 oz
7/8" 3/8" 3 oz 9 oz 16 oz 22 oz 28 oz

88-A4AC4001-1G-EN 7
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.
Total Vertical Change (lift) = __________ Ft.
Line Length
5.5 Reuse Existing Refrigerant Lines
CAUTION
!
If using existing refrigerant lines make certain that
all joints are brazed, not soldered.
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
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 publica-
tion number SS-APG006-EN.

8 88-A4AC4001-1G-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.
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 ap-
propriate method every 8 ft.
Joist/Rafter
Isolator
Line Set
8 Feet Maximum
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

88-A4AC4001-1G-EN 9
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.
STEP 2 - Remove the pressure tap cap and
valve cores from both service valves.

10 88-A4AC4001-1G-EN
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 nitro-
gen 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: Install drier in Liquid Line.
NOTE:NOTE: Precautions should be taken to avoidPrecautions should be taken to avoid
heat damage to basepan during brazing. It isheat damage to basepan during brazing. It is
recommended to keep the flame directly off ofrecommended to keep the flame directly off of
the basepan.the basepan.
STEP 5 - Replace the pressure tap valve cores
after the service valves have cooled.