Mitsubishi Electric MUZ-GC25VA, Руководство по обслуживанию

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Check of open phase
B
How to check inverter/ compressor
A
When OPERATION INDICATOR lamp flashes 5-times.
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).
See 11-5.
C
“Check of compressor” .
No
See 11-5.
B
“Check of open phase” .
Replace the inverter P.C. board.
Yes
Are the voltages
balanced?
11-5. Troubleshooting flow
Check of compressor
OK
Replace the compressor.
Refer to 11-5.
D
"Check of
compressor winding".
Is the compressor normal?
No
Replace the compressor.
No
Yes
Yes
Refer to 11-5.
E
"Check of
compressor operation time".
Does the compressor
operate continuously?
Is the compressor
operation time more than
10 seconds?
No
Check the refrigerant circuit.
Check stop valve.
Yes
Refer to 11-5.
F
"Check of compressor start failure".
(MUZ-GC25)
(MUZ-GC35)
C
●
With the connector between the compressor and the intelligent
power module disconnected, activate the inverter and check if the
inverter is normal by measuring the balance of voltage between the
terminals.
<< Operation method>>
Start cooling or heating operation by pressing EMERGENCY OPERATION switch on
the indoor unit. (Test run operation : refer to 8-3.)
<<Measurement point>>
at 3 points
BLK (U)-WHT (V)
BLK (U)-RED (W)
WHT(V)-RED (W)
NOTE: 1. Output voltage varies according to power supply voltage.
2. Measure the voltage by analog type tester.
3. During this check, LED of inverter P.C. board flashes 9 times. (Refer to 11-6.1.)
Output voltage 115V
w
Measure AC voltage between
the lead wires at 3 points.
9-time flash
2.5-second OFF
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