Troubleshooting For Wiring (Interconnect Cable And Serial Signal Wire) - Carrier 42CJR024-723 Service Manual

9-7. Troubleshooting for Wiring (Interconnect cable and Serial Signal Wire)

9-7-1. Outdoor unit does not operate.
<Inspection procedure>
(1) Is the voltage between
(2) Are signals from the indoor unit to the outdoor unit transmitted correctly based upon the following diagram?
NOTE:
Measure the voltage for 2 minutes and 30 seconds after starting the unit.
Heatpump model
Terminal block on indoor side
Red
White
Normal condition : Voltage varied between AC70 ~ 100V
Abnormal condition : Voltage does not vary.
Cooling model
Terminal block on indoor side
Normal condition : After start operated about 2 minutes and 30 seconds. Voltage between
of the indoor's Terminal block should be equal AC 220 ~ 240V
Abnormal condition : Don't found voltage AC 220 ~ 240V from terminal block (0V)
9-7-2. Outdoor unit stops a while after starting the unit.
<Confirmation procedure> Select one of 3 cases below and follow the procedure.
(1) The outdoor unit stops between 10 and 20 minutes passed after starting and it takes 10 minutes or more to
restart the unit.
Compressor is turned off and on automatically by thermo sensor
(Heat pump Model) or thermostat (Cooling only Model).
(2) The outdoor unit stops once, it would not operate until the power is turned on again.
(3) The outdoor unit stops between 10 minutes to 1 hour after starting and a check code is indicated on the
remote control. (Check code 03-1E : Refer to Table 9-4-1.)
and of the indoor terminal block varied?
1
2
3
2
1
Terminal block
Red
3
White
2
1
Terminal block
Gas has a low circulation.
Measure gas pressure.
Refer to 9-6-4 "Compressor does not operate"
Tester
Tester
Fig. 9-7-1
− 64−
FILE NO. SVM-05010
and
2 3
Gas shortage
Gas leak
Pipe clogging
of the