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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.
A. GENERAL
WARNING
!
This information is intended for use by individuals posses-
sing 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.
The following instructions cover 4TWR4 & 4TWR2 Heat
Pump Units.
NOTE:
These outdoor units are designed to be installed with
approved/matched Trane indoor systems.
WARNING
!
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 pos-
sible. Never break a vacuum with air and always change the
driers when opening the system for component replacement.
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
Heat Pump has been designed and
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
Installer's Guide
Heat Pumps
4TWR4 & 4TWR2
UNIT CONTAINS R-410A REFRIGERANT!
R-410A OPERATING PRESSURE EXCEEDS THE
LIMIT OF R-22. PROPER SERVICE EQUIPMENT IS
REQUIRED. FAILURE TO USE PROPER SERVICE
TOOLS MAY RESULT IN EQUIPMENT DAMAGE OR
PERSONAL INJURY.
1
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.
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
CAUTION
!
SERVICE
USE ONLY R-410A REFRIGERANT AND
APPROVED POE COMPRESSOR OIL.
5 FT. ABOVE UNIT — UNRESTRICTED
18-BC51D1-3

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   Summary of Contents for Trane 4TWR4

  • Page 1

    5 FT. ABOVE UNIT — UNRESTRICTED for the interpretation of this information, nor can it assume any liability in connection with its use. The following instructions cover 4TWR4 & 4TWR2 Heat Pump Units. NOTE: These outdoor units are designed to be installed with approved/matched Trane indoor systems.

  • Page 2

    CAUTION is not the application used please refer to application If using existing refrigerant lines make certain that all joints bulletin “Trane APB2001-02”. are brazed, not soldered. 3. The support pad must NOT be in direct contact with any structure. Unit must be positioned a minimum of 12" from Condensing units have provisions for braze connections.

  • Page 3

    Installer’s Guide BRASS GAS LINE SERVICE VALVE GAS LINE SERVICE VALVE The Brass Gas Line Service Valve is shipped in the closed position to hold the factory refrigerant charge. The pressure 1/4 TURN ONLY COUNTERCLOCKWISE tap service port (when depressed) opens only to the field FOR FULL OPEN POSITION brazing side when the valve is in the closed position.

  • Page 4

    Installer’s Guide 3. Install a separate disconnect switch at the outdoor unit. NOTE: Unnecessary switching of hoses can be avoided and com- 4. Ground the outdoor unit per local code requirements. plete evacuation of all lines leading to sealed system can 5.

  • Page 5

    Installer’s Guide 2. TST = Test (Shorting TEST_COMMON to this pin I. OPERATIONAL AND speeds up all defrost board timings.) CHECKOUT PROCEDURES 3. FRC_DFT = Forced Defrost (Short TEST_COMMON to Final phases of this installation are the unit Operational and this pin for two (2) seconds to initiate a forced defrost.

  • Page 6

    Installer’s Guide 4TWR4 & 4TWR2 OUTLINE DRAWING NOTE: ALL DIMENSIONS ARE IN MM (INCHES). MODELS BASE FIG. 4TWR2018A 832 (32-3/4) 829 (32-5/8) 756 (29-3/4) 143 (5-5/8) 92 (3-5/8) 210 (8-1/4) 79 (3-1/8) 508 (20) 4TWR2024A 832 (32-3/4) 829 (32-5/8) 756 (29-3/4)

  • Page 7

    Installer’s Guide MOUNTING HOLE LOCATION NOTE: ALL DIMENSIONS ARE IN MM (INCHES). NOTE: For model base size, see table on page 6. From Dwg. D152637 Rev. 1 18-BC51D1-3...

  • Page 8

    S - Secondary Causes - 3 Phase Only P.I. 04/05 Trane A business of Trane has a policy of continuous product and product data improvement and it reserves the right to change American Standard Companies www.trane.com design and specifications without notice.

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