Trane 4TWA3 manual Installer’s Guide, I. Electric Heaters, J. Start Control, K. Outdoor Thermostat

I. 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.

J. 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.

K. OUTDOOR THERMOSTAT

An outdoor thermostat TAYSTAT250B may be field installed. For data, see wiring diagram attached to unit and instruc- tion sheet packaged with outdoor thermostat.

L. 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.

Installer’s Guide

M. TROUBLESHOOTING

TROUBLESHOOTING CHART — WHAT TO CHECK

O

.

REF

*

CONTROL

D

WHAT

HIGH

.

.

DEFROST

LOW

STUCK

REF

AIR

CIR

SOVCHECK

CONTACTOR

LOW

EXCESSIVE

RES

DEFROST

TO

REF

TXV

RES .

START

.

.

.

.

COIL

POWERVOLTAGE

RUN

VOLTAGE

INEFFICIENT

O

.

I

VALVE

SYSTEM FAULTS CHECK COMPRESSOR

START

CONTACTOR

.

D

SOV

VOLTAGE

.

CONTROL

NONCONDENSABLESSTUCK

TRANSFORMER

EVAP

RECIRCULATIONRESTRICTIONS

RELAY

UNDERCHARGE.

THERMOSTATCOMPRESSOROVERCHARGE

SUPERHEAT

DEFECTIVE

CAPACITORCAPACITORCONTACTS

AIRFLOW

SUPPLYWIRING

RELAY

WIRING

FUSE COMP

AIRFLOWLEAKINGLEAKING

MODE

IOL

LOAD

OPEN

DEFDEF

COIL

.

. .

REFRIGERANT CIRCUIT

Head Pressure Too High

C

P

P

S

P

S

S

H

P

P

S

P

S

Head Pressure Too Low

C

S

P

S

S

S

S

S

P

H

S

P

S

S

S

S

P

Suction Pressure Too High

C

S

P

P

S

P

P

H

S

S

P

Suction Pressure Too Low

C

P

S

P

S

S

H

P

S

S

S

S

Liquid Refrig. Floodback (TXV)

C

P

P

H

P

P

I.D. Coil Frosting

C

P

S

S

H

Compressor Runs

C

S

P

S

S

S

P

S

S

S

S

Inadequate or No Cooling/Htg

H

S

P

S

S

P

S

S

S

ELECTRICAL

Compressor & O.D. Fan

C

P

P

S

P

S

P

P

Won’t Start

H

P

P

S

P

S

P

P

Compressor Will Not Start

C

P

S

P

S

S

S

P

But O.D. Fan Runs

H

P

S

P

S

S

S

P

O.D. Fan Won’t Start

C

P

P

S

H

P

P

S

Compressor Hums But Won’t Start

C

P

S

S

S

P

H

P

S

S

S

P

Compressor Cycles on IOL

C

P S P S S S

P S P P S

S S

S

S

H

P S P S S S

P S P P S

S

S P

S

I.D. Blower Won’t Start

C

P

P

S

P

S

S

H

P

P

S

P

S

S

DEFROST

Unit Won’t Initiate

Defrost

C

H

P

P

P

Defrost Terminates on Time

C

H

P

P

Unit Icing Up

C

H

P

S

S

S

P

P

C - Cooling

H - Heating

P - Primary Causes

S - Secondary Causes

* - 3 Phase Only

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

18-BC62D1-1 5