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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.

Installer’s Guide

The Weathertron

®

 Heat Pump has been designed and manu-

factured to withstand and operate in severe winter condi-
tions. However, there are precautionary steps which should
be taken at the time of installation which will help assure
the efficient operation of the unit. It is recommended 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

18-BC51D1-4

Heat Pumps

4TWR3 & 4TWR4

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 informa-
tion 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.

NOTICE:
Trane has always recommended installing Trane approved
matched indoor and outdoor systems.
The benefits of installing approved matched systems are
maximum efficiency, optimum performance and best
overall system reliability.

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 refriger-
ant 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 TRN-APG02-EN.

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.

1

5 FT. ABOVE UNIT — UNRESTRICTED

CAUTION

!

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.

SERVICE

USE ONLY R-410A REFRIGERANT AND

APPROVED POE COMPRESSOR OIL.

Содержание 4TWR3

Страница 1: ...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 dama...

Страница 2: ...should not exceed sixty 60 feet liquid line 8 Locate and install indoor coil or air handler in accordance with instruction included with that unit C INSTALLING REFRIGERANT LINES CAUTION If using exist...

Страница 3: ...indoor units is completed the field brazed connections must be checked for leaks Pressurize through the service valve ports the indoor unit and field refrigerant lines with dry nitrogen to 350 400 ps...

Страница 4: ...te and relative capacity of the heat pump system By measuring the change in delta T we can determine the need for defrost The coil sensor also serves to sense outdoor coil temperature for termination...

Страница 5: ...E W IR IN G C O M P R E S S O R IO L R U N C A P A C IT O R S T A R T C A P A C IT O R S T A R T R E L A Y C O N T A C T O R C O N T A C T S L O W V O L T A G E W IR IN G C O N T R O L T R A N S F O R...

Страница 6: ...Subcool Charging Table Pressure 20 15 Use Design Subcool Value from Table 10 0 Subtract 10 psig from S C Table Pressure 10 20 25 30 40 60 80 TOTAL REFRIGERANT LINE LENGTH FEET REFRIGERANT LINE LIFT FE...

Страница 7: ...946 37 1 4 870 34 1 4 7 8 3 8 152 6 98 3 7 8 219 8 5 8 86 3 3 8 508 20 4TWR3060A 4 1 1045 41 1 8 946 37 1 4 870 34 1 4 7 8 3 8 152 6 98 3 7 8 219 8 5 8 86 3 3 8 508 20 4TWR4018A 3 1 933 36 3 4 829 32...

Страница 8: ...nry been sealed If mortar is used prevent mortar from coming into direct contact with copper tubing 5 Verify tightness of all electrical connects 6 Observe outdoor fan during on cycle for clearance an...

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