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18-BC51D1-3

5

Installer’s Guide

TYPICAL FIELD HOOK-UP DIAGRAMS

Notes:

1. Be sure power supply agrees with equipment nameplate.
2. Power wiring and grounding of equipment must comply with local codes.
3. Low voltage wiring to be No. 18 AWG minimum conductor.
4. ODT-B must be set lower than ODT-A.
5. If outdoor thermostats (ODT) are not used, connect W1 to W2 and W3.
6. N/A to programmable thermostat.

LEGEND

FACTORY WIRING

FIELD WIRING

2. TST  =  Test (Shorting TEST_COMMON to this pin

speeds up all defrost board timings.)

3. FRC_DFT  =  Forced Defrost (Short TEST_COMMON to

this pin for two (2) seconds to initiate a forced defrost.
Remove the short after defrost initiates.)

DEFROST CONTROL CHECKOUT

Normal operation requires:

a. LED on board flashing 1 time/second.

b. 24V AC between R & B

c. 24V AC between Y & B with unit operating

d. Defrost initiation when FRC_DFT pin is shorted to

TEST_COMMON pin.

If a defrost control problem is suspected, refer to the service
information in control box.

WARNING

!

Do NOT connect 24 VAC to T1 (ODS-A) terminal. ODS-A
thermistor WILL BE BLOWN.

H. COMPRESSOR START UP

After all electrical wiring is complete, SET THE THERMO-
STAT SYSTEM SWITCH IN THE OFF POSITION SO
COMPRESSOR WILL NOT RUN, and apply power by
closing the system main disconnect switch. This will activate
the compressor sump heat (where used). Do not change the
Thermostat System Switch until power has been applied for
one (1) hour. Following this procedure will prevent potential
compressor overload trip at the initial start-up.

I. OPERATIONAL AND

CHECKOUT PROCEDURES

Final phases of this installation are the unit Operational and
Checkout Procedures which are found in this instruction on
page 8. To obtain proper performance, all units must be
operated and charge adjustments made in accordance 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. START CONTROL

Some models have quick start components which are factory
installed. For models that do not have factory installed start
components, provisions are made for a field installed start kit
accessory. When adding an accessory, follow the instructions
provided with the kit.

L. 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.

M. SEACOAST SALT SHIELD

Units installed within one mile of salt water including
seacoasts and inland waterways, require the addition of
BAYSEAC001 (Seacoast Kit) at the time of installation.

IMPORTANT:
See Limited Warranty information in Use and Care Manual.

Summary of Contents for 4TWR4

Page 1: ...trical 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...

Page 2: ...ure 6 The maximum length of refrigerant lines from outdoor to indoor unit should NOT exceed sixty 60 feet 7 If outdoor unit is mounted above the air handler maxi mum lift should not exceed sixty 60 fe...

Page 3: ...hen depressed opens only to the field brazing side when the valve is in the closed position The Gas Line Service Valve is full open with a 1 4 turn See Figure 5 BRAZING REFRIGERANT LINES 1 Remove lowe...

Page 4: ...feet and or a different size than recommended it will be necessary to adjust system refrigerant charge upon completion of installation See unit Service Facts F ELECTRICAL CONNECTIONS WARNING When ins...

Page 5: ...switch This will activate the compressor sump heat where used Do not change the Thermostat System Switch until power has been applied for one 1 hour Following this procedure will prevent potential co...

Page 6: ...1 841 33 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 4TWR2060A 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...

Page 7: ...18 BC51D1 3 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...

Page 8: ...ressor 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 De...

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