Check Of Compressor Operation Time; Check Of Compressor Start Failure - Mitsubishi Electric Mr.Slim MUZ-GC25NA - C1 Service Manual

E Check of compressor operation time
MUZ-GC25/35NA MUZ-GC50NA-
● Connect the compressor and activate the inverter. Then
measure the time until the inverter stops due to over current.
<<Operation method>>
Start heating or cooling operation by pressing EMERGENCY
OPERATION switch on the indoor unit.
(TEST RUN OPERATION : Refer to 6-3.)
<<Measurement>>
Measure the time from the start of outdoor fan running to the
stop of compressor due to overcurrent.
F Check of compressor start failure
MUZ-GC25/35NA MUZ-GC50NA-
Confi rm that 1~4 is normal.
•Electrical circuit check
1. Contact of the compressor connector (including CN61)
2. Output voltage of inverter P.C. board and balance of them (See 9-5. )
3. Direct current voltage between DB61(+) and (-) on the inverter P.C.board
4. Voltage between outdoor terminal block S1-S2
Does the compressor run for 10 seconds or
more after it starts?
After the compressor is heated with a drier,
does the compressor start?
Compressor start failure. Activate pre-heat control.
(Refer to 8-2. "PRE-HEAT CONTROL SETTING")
C2
C2
Yes
No
No
1
Yes
<<Judgement>>
0 second
1 second
2 seconds
10 seconds
10 minutes
Check the refrigerant circuit.
Check the stop valve.
Replace the compressor.
38
Compressor starts
Abnormal
(IPM failure)
(Compressor winding short)
Abnormal
(Compressor lock out)
(Starting defect)
Abnormal
(Poor contact,)
(Outdoor P.C. board defect)
(Disconnected connector)
Abnormal
(Refrigerant circuit defect)
(Closed valve)
Normal
1
Heat the compressor with
a drier for about 20 minutes.
Do not recover refrigerant
gas while heating.
Heating part