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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

space. The barrier should be constructed of materials
which will blend in with the building design.

3. Avoid locating the unit where condensation and freezing

of defrost vapor may annoy the customer. For instance,
installing the unit under a bedroom, kitchen, or picture
window may be annoying to the customer since conden-
sate and fog will occur during the defrost cycle.

4. Avoid locating the unit under the eaves or other over-

head structures as sizeable icicles may form and the unit
may be damaged by these falling icicles.

B. LOCATION AND PREPARATION

OF THE UNIT

1. When removing unit from the pallet, notice the tabs on

the basepan. Remove tabs by cutting with a sharp tool as
shown on page 2, Figure 2, and slide unit off of pallet.

2. The unit should be set on a level support pad at least as

large as the unit base pan, such as a concrete slab. If this
is not the application used please refer to application
bulletin 

SSC-APG002-EN

.

3. The support pad must NOT be in direct contact with any

structure. Unit must be positioned a minimum of 12"
from any wall or surrounding shrubbery to insure
adequate airflow. Clearance must be provided in front of

Heat Pumps

2TWB0012-036AA

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

The following instructions cover 2TWB0012-036AA Heat
Pump Units.

NOTE:
These outdoor units may be used with indoor units
equipped with Thermostatic Expansion Valve or Accutron™
Flow Control Check Valve (F.C.C.V.) assembly for refrigerant
flow control only.

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
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
distance from the unit to prevent restriction of airflow to
and from the unit. Also allow for proper maintenance

1

5 FT. ABOVE UNIT-UNRESTRICTED

18-BC52D5-5

Summary of Contents for 2TWB0012-036AA

Page 1: ...rise which are not covered sufficiently for the purchaser s purposes the matter should be referred to your installing dealer or local distributor A GENERAL The following instructions cover 2TWB0012 036AA Heat Pump Units NOTE These outdoor units may be used with indoor units equipped with Thermostatic Expansion Valve or Accutron Flow Control Check Valve F C C V assembly for refrigerant flow control...

Page 2: ...el in an envelope attached to the outdoor unit Outdoor unit nameplate will have correct orifice size specified as BAYFCCV A for rated performance D INSTALLING REFRIGERANT LINES Condensing units have provisions for flare connections Pressure taps are provided on the service valves of outdoor unit for compressor suction and liquid pressures The indoor end of the recommended refrigerant line sets may...

Page 3: ...into either valve pressure tap port thru the tubing and out the other port while brazing 8 Braze using accepted good brazing techniques LEAK CHECK IMPORTANT Replace pressure tap port valve core before attaching hoses for evacuation After the brazing operation of refrigerant lines to both the outdoor and indoor unit is completed the field brazed connections must be checked for leaks Pressurize thro...

Page 4: ...fy connections between the outdoor unit the thermostat and the indoor unit Table 1 NEC Class II Control Wiring 24 VOLTS WIRE SIZE MAX WIRE LENGTH 18 AWG 150 FT 16 AWG 225 FT 14 AWG 300 FT 8 Table 1 defines maximum total length of low voltage wiring from outdoor unit to indoor unit and to thermostat 9 Mount the indoor thermostat in accordance with instruc tion included with the thermostat Wire per ...

Page 5: ...ordance with procedures found in the Service Facts J ELECTRIC HEATERS Electric heaters if used are to be installed in the air han dling device according to the instructions accompanying the air handler and the heaters K OUTDOOR THERMOSTAT An outdoor thermostat TAYSTAT250B may be field installed For data see wiring diagram attached to unit and instruction sheet packaged with outdoor thermostat L SE...

Page 6: ... 4 181 7 1 8 44 1 3 4 457 18 2TWB0018AA 2 2 651 25 5 8 724 28 1 2 651 25 5 8 3 4 5 16 127 5 57 2 1 4 181 7 1 8 44 1 3 4 457 18 2TWB0024AA 2 2 730 28 3 4 724 28 1 2 651 25 5 8 3 4 5 16 137 5 3 4 65 2 5 8 210 8 1 4 57 2 1 4 457 18 2TWB0030AA 2 2 730 28 3 4 724 28 1 2 651 25 5 8 7 8 3 8 137 5 3 4 65 2 5 8 210 8 1 4 57 2 1 4 457 18 2TWB0036AA 3 2 832 32 3 4 829 32 5 8 756 29 3 4 7 8 3 8 137 5 3 4 86 3...

Page 7: ...18 BC52D5 5 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 21D152989 Rev 0 ...

Page 8: ...RICAL Compressor O D Fan Won t Start Compressor Will Not Start But O D Fan Runs O D Fan Won t Start Compressor Hums But Won t Start Compressor Cycles on IOL I D Blower Won t Start DEFROST Unit Won t Initiate Defrost Defrost Terminates on Time Unit Icing Up W H A T T O C H E C K M O D E P O W E R S U P P L Y H I G H V O L T A G E W I R I N G C O M P R E S S O R I O L R U N C A P A C I T O R S T A R...

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