MITSUBISHI ELECTRIC MUZ-GB50VA - Manual (Page 24)

24
10-6. Troubleshooting flow
MUZ-GB50VA
A A How to check inverter/ compressor
No
No
Yes
Yes
Yes
No
Yes
No
Disconnect the terminal of the compressor. 3 minutes after turning on the power supply, start
EMERGENCY OPERATION.
Is output balanced?
Clarify the causes by counting time until the inverter stops.
0 to 10 seconds: compressor rare short
10 to 60 seconds: compressor lock
60 seconds to 5minutes: refrigerant circuit defective
5 minutes or more: normal
Measure the voltage between each
lead wire leading to the compressor.
U (BLK) - V (WHT)
V (WHT) - W (RED)
W (RED) - U (BLK)
Is voltage output on right table?
Turn off power supply of indoor and outdoor unit,
and measure the compressor winding resistance
between the compressor terminals.
Is the resistance between each terminal normal?
Is the input voltage to the outdoor electronic
control P.C. board 370V or more?
Reconnect the lead wire of compressor, and turn on
power supply to indoor and outdoor unit.
3 minutes later, starts EMERGENCY OPERATION.
Replace the
compressor.
Replace the power board.
COOL HEAT
122V~154V
(56Hz~71Hz)
74V~126V
(30Hz~58Hz)
W • After the outdoor fan starts running, wait for 1 minutes or more before
measuring the voltage.
• The output voltage values have the tolerance of i 20%.
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