Trane 4TTZ0, 4TWZ0 Installer's Manual
18-BC53D2-6
Installer’s Guide
Air Conditioner/Heat Pumps
4TTZ0/4TWZ0 with ComfortLinkTM II and Charge Assist
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.
TM
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 .................................................... 12
Section 12. Electrical - High Voltage ................................................... 17
Section 13. Start Up .............................................................................. 18
Section 14. System Charge Adjustment ............................................. 19
Section 15. Checkout Procedures and Troubleshooting ................... 30
Section 1. Safety
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WARNING
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WARNING
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WARNING
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WARNING
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CAUTION
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CAUTION
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▲
WARNING
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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
Bulletin 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.
NOTE: It is recommended to install manufacturer approved matched indoor and outdoor systems.
NOTE: All approved split systems are AHRI rated with only
TXV indoor systems.
NOTE: The benefits of installing approved indoor and
outdoor split systems are maxi mum efficiency, optimum
performance and the best overall system reliability.
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-BC53D2-6
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)
4TTZ0024A
4TTZ0036B
4TTZ0048A/B
4TTZ0060A
4TWZ0024A
4TWZ0036B
4TWZ0048A/B
4TWZ0060A
* Weight values are estimated (uncrated).
54 x 34 x 37 335
54 x 34 x 37 335
54 x 34 x 37 420
54 x 34 x 37 420
54 x 34 x 37 340
54 x 34 x 37 345
54 x 34 x 37 430
54 x 34 x 37 430
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 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 revision).
Standard
Line Set
60’ Max
Line Length
*
25’
Max
Line
Lift
35’ Max
Line
Length
*
Restricted to maximum vertical change of 25 ft.
18-BC53D2-6 3
25’
Max
Line
Lift
*
35’ Max
Line
Length
Avoid Install
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.
Avoid locations such as near windows where
condensation and freezing defrost vapor can
annoy a customer.
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 or icicles from falling directly on the unit.
Near Bedrooms
Min. 12” to
Shrubbery
Min. 12” to
Shrubbery
Min 5’ Unrestricted
Min 3’
Unrestricted
Access Panel
Min. 12”
to Wall
2.4 Cold Climate Considerations (Heat Pump only)
NOTE: It is recommended that these precautions be taken for units being installed in areas
where snow accumulation and prolonged below
freezing temperatures occur.
• Units should be elevated 3-12 inches above
the pad or roof top, depending on local
weather. This additional height will allow
drainage of snow and ice melted during
defrost cycle prior to its refreezing. Ensure
that drain holes in unit base pan are not
obstructed preventing draining of defrost
water.
• 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.
Min. 12”
Snow
Barrier
Snow Legs
3-12” Elevation
Pad
4 18-BC53D2-6
2.5 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.
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.
18-BC53D2-6 5
Section 5. Refrigerant Line Considerations
5.1 Refrigerant Line and Service Valve Connection Sizes
Table 5.1
Line Sizes Service Valve Connection Sizes
Model
4TTZ0024A
4TTZ0036B
4TTZ0048A/B
4TTZ0060A
4TWZ0024A
4TWZ0036B
4TWZ0048A/B
4TWZ0060A
Vapor
Line
3/4 3/8 5/8 3/8
3/4 3/8 3/4 3/8
7/8 3/8 3/4 3/8
7/8 3/8 3/4 3/8
5/8 3/8 5/8 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
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. See unit
nameplate. If connecting line length exceeds fifteen (15) feet and/or a larger indoor evaporative coil is
installed, then final refrigerant charge adjustment is necessary. Use Charge Assist™ or the Manual Charging procedure found in the outdoor unit Service Facts. Charge level can always be verified with the Refrigerant
Charging Chart found in the Service Facts.
Liquid
Line
Vapor Line
Connection
Liquid Line
Connection
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.
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.
Liquid Line
Line Length
Vapor Line
Insulation
6 18-BC53D2-6
5.5 Reuse Existing Refrigerant Lines
▲
CAUTION
!
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.
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.
Comply with National, State, and Local Codes when
isolating line sets from joists, rafters, walls, or other
structural elements.
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
Joist/Rafter
Isolator
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 appropriate method every 8 ft.
Line Set
18-BC53D2-6 7
Isolation From Joist/Rafter
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 deburr-
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
8 18-BC53D2-6
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 basepan.
18-BC53D2-6 9
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 nitrogen pressure and repair any leaks
before continuing.
10 18-BC53D2-6
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