31
Refer to 11-5. “Check of compressor
operation time”.
Does the compressor operate continuously?
Refer to 11-5. “Check of compressor start failure”.
OK
No
Yes
Refer to 11-5. “Check of compressor
winding”.
Is the compressor normal?
Replace the compressor.
No
Yes
C Check of compressor
D Check of compressor winding
E Check of compressor operation time
● Disconnect the connector (CN61) between the compressor and power module, and measure the resistance between the com-
pressor terminals.
<<Measurement point>>
At 3 points
BLK-WHT
BLK-RED
WHT-RED
<<Judgement>>
Refer to 11-4.
0 [Ω] ················Abnormal [short]
Infinite [Ω] ·······Abnormal [open]
NOTE
: Be sure to zero the ohmmeter before measurement.
Measure the resistance between the lead wires at 3 points.
● Connect the compressor and activate the inverter. Then measure
the time until the inverter stops due to overcurrent.
<<Operation method>>
Start heating or cooling operation by pressing EMERGENCY
OPERATION switch on the indoor unit.
(TEST RUN OPERATION: Refer to 8-3.)
<<Measurement>>
Measure the time from the start of compressor to the stop of
compressor due to overcurrent.
Compressor starts
Abnormal
(IC700 failure)
(Compressor winding short)
Abnormal
(Compressor lock out)
(Starting defect)
Abnormal
(Poor contact,)
(Inverter P.C. board defect)
(Disconnected connector)
Abnormal
(Refrigerant circuit defect)
(Closed valve)
Normal
0 second
1 second
2 seconds
10 seconds
10 minutes
<<Judgement>>
OBH751
