Mitsubishi Electric MSZ-A09RV-E1 Service Manual page 48

C
Check of compressor
Check resistance of compressor.
Is resistance
1~several " at -10:
~ 40: of winding
temperature?
Yes
Check compressor operation time
Does compressor run
continuously?
Yes
Normal
D
Check of compressor winding
Disconnect the connector between compressor and IPM, and
measure resistance between the compressor terminals.
<<Measurement point>>
at 3 points
BLK-WHT
BLK-RED
WHT-RED
<<Judgment>>
0.82 to 1.01" at -10: to 40: of part temperature.
0["] ···············abnormal [short]
Infinite["] ·······abnormal [open]
NOTE 1.Be sure to zero the ohmmeter before measurement.
2.Winding resistance for each phase is 0.45" at 20:.
E
Check of compressor operation time
Connect the compressor and activate the inverter. Then measure
the time until the inverter stops due to overcurrent.
<<Operation method>>
Start heating or cooling operation by pressing the Emergency
operation switch on the indoor unit. (Test-run mode)
<<Measurement>>
Measure the time from the start of outdoor fan running till the
stop of the inverter due to overcurrent.
<<Judgment>>
For reference
0~10 seconds·····················abnormal (short)
10~60 seconds···················abnormal (compressor lock-out)
60 seconds~5 minutes·······abnormal (refrigerant circuit defect)
more than 5 minutes···········normal
No
No
w Measure resistace between the
lead wires at 3 points.
See D 'Check of compressor winding'
Compressor short or open
See E ' Check of compressor operation time,'
Compressor layer short ,
lock-out or
refrigerant circuit defective.
Ohmmeter indication
"
X1
"
X1
"
X1
0 sec.
10 sec.
60 sec.
5 min.
48
Replace compressor
Replace compressor.
Check refrigerant circuit.
WHT
2
normal V
(1~several ")
Compressor motor
abnormal
(0" ····· short)
abnormal
(infinite····· open)
Outdoor fan starts
Abnormal
(Compressor short circuit or layer short)
Abnormal
(Compressor lock-out)
Abnormal
(refrigerant circuit defect, etc.)
Normal
RED BLK
3
1
W
U