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How to check inverter/ compressor
• When heating, room does not get warm.
• When cooling, room does not get cool.
No
No
Yes
Yes
Yes
No
Yes
No
(MXZ-3A/4A/5A)
Yes
(MXZ-2A)
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 layer 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)
Output voltage
COOL: 150V (48Hz) HEAT: 170V (64Hz)
Is voltage output? 1, 2
Turn OFF the power supply of indoor and outdoor
unit, and measure the compressor winding
resistance between the compressor terminals.
Is there resistance between each terminal normal?
(Refer to 13-5.)
Is the input voltage to the outdoor electronic
control P.C. board 370V or more?
Reconnect the lead wire of compressor, and turn ON
the power supply to indoor and outdoor unit.
3 minutes later, start EMERGENCY OPERATION.
Replace the
compressor.
Replace the inverter P.C. board or
the power board.
1 After the outdoor fan starts running, wait for 1 minute
or more before measuring the voltage.
The output voltage values have the tolerance of ± 20%.
2 The output differs depending on the capacity or the
number of indoor units to be operated.
Summary of Contents for MXZ-2A30VA
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