Service Instructions

SERVICING
85
VOLT/OHM
METER
T1
T2
L1L2
CC
Ohmmeter for testing holding coil
Voltmeter for testing contacts
TESTING COMPRESSOR CONTACTOR
(Single Phase)
THREE PHASE
Using a voltmeter, test across terminals:
A. L1-L2, L1-L3, and L2-L3 - If voltage is present, proceed to
B. If voltage is not present, check breaker or fuses on
main power supply..
B. T1-T2, T1-T3, and T2-T3 - If voltage readings are not the
same as in "A", replace contactor.
VOLT/OHM
METER
CC
Ohmmeter for testing holding coil
Voltmeter for testing contacts
T1
L1
T3
L3
T2
L2
TESTING COMPRESSOR CONTACTOR
(Three-Phase)
S-9 CHECKING FAN RELAY CONTACTS
WARNING
HIGH VOLTAGE!
Disconnect ALL power before servicing
or installing. Multiple power sources
may be present. Failure to do so may
cause property damage, personal injury
or death.
1. Disconnect wire leads from terminals 2 and 4 of Fan Relay
Cooling and 2 and 4, 5 and 6 of Fan Relay Heating.
2. Using an ohmmeter, test between 2 and 4 - should read open.
Test between 5 and 6 - should read continuous.
3. With power ON, energize the relays.
Line Voltage now present.
WARNING
1
2
3
4
5
OHMMETER
TESTING FAN RELAY
4. Using an ohmmeter, test between 2 and 4 - should read
continuous . Test between 5 and 6 - should read open.
5. If not as above, replace the relay.
CHECKING RELAY CONTACTS - PSC FAN MOTOR
WARNING
HIGH VOLTAGE!
Disconnect ALL power before servicing
or installing. Multiple power sources
may be present. Failure to do so may
cause property damage, personal injury
or death.
1. Disconnect the motor leads from 6-circuit fan motor wire
harness.
2. Connect a voltmeter between circuit 3 and circuits 2 (low
speed) or 1 (high speed).
NOTE: Circuit 3 is connected directly to L2.
3. Energize the system at low or high stage.
Line Voltage now present.
WARNING
4. The measured voltage between circuit 3 and circuits 2 or 1
should be approximately 0VAC, which indicates the relay
contacts are closed. A voltage measurement of approxi-
mately 115VAC indicates the relay is open. Replace the
control if the relay checks open when it should be closed. See
notes and cautions below.
NOTE: Ensure any ON delays have expired before making voltage
measurements