Mitsubishi MUY-A15NA, Руководство по обслуживанию

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How to check inverter/ compressor
A
When OPERATION / INDICATOR lamp flashes 5-time.
Outdoor unit does not operate.
Check the voltage
between terminals.
Check the
compressor.
Disconnect the connector (CN61)
between compressor and the
intelligent power module (IPM).
Check the resistance of the intelligent
power module.
See 10-5.
D
“Check of compressor” .
No
See 10-5.
B
“Check of open phase” .
See 10-5.
C
“Check of intelligent power module”.
Is the resistance
infinite?
Yes
Replace the inverter P.C.
board.
No
(0~several
"
)
Yes
Are the voltages
balanced?
Replace the inverter P.C.
board and compressor.
10-5. Troubleshooting flow
MUZ-A09/12/15/17 MUY-A15/17
MUZ-A24 MUY-A24
A A
How to check inverter/ compressor
LED display:
LED1 LED2
Lighting Lighting
Lighting
Twice
Twice
Goes out
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~187V
(56Hz~87Hz)
74V~126V
(30Hz~58Hz)
W
• After the outdoor fan starts running, wait for 1 minute or more before
measuring the voltage.
• The output voltage values have the tolerance of
i
20%.
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