Mitsubishi Electric SUZ-KA25VA Technical & Service Manual page 63

Check of compressor
D
E "Check of compressor
winding".
Is the compressor normal?
Yes
F "Check of compressor
operation time". Does the
compressor operate
continuously?
Yes
Ok
Check of compressor winding
E
Disconnect the connector (CN61) between compressor and intelligent
power module, and measure the resistance between the compressor
terminals.
Measurement point at 3 points of lead wire.
BLK-WHT
BLK-RED
WHT-RED
<<Judgment>>
Refer to 12-4..
0["] ···············Abnormal [short]
Infinite["] ·······Abnormal [open]
NOTE 1. Be sure to zero the ohmmeter before measurement.
2. Winding resistance for each phase at 20:.
Refer to 4. SPECIFICATION.
Check of compressor operation time
F
Connect the compressor and activate the inverter. Then measure
the time until the inverter stops due to over current.
<<Operation method>>
[For wireless remote controller use model]
Start heating or cooling operation by pressing the EMERGENCY
OPERATION switch on the indoor unit. (Test-run mode)
[For wired remote controller use model]
Start heating or cooling operation by pressing the TEST button
twice on the remote controller. (Test-run mode)
<<Measurement>>
Measure the time from the start of outdoor fan running to the stop of
compressor due to over current.
<<Judgment>>
For reference
0~10 seconds·····················Abnormal (compressor short or poor contact)
10 seconds~5 minutes·······Abnormal (refrigerant circuit defect)
more than 5 minutes···········Normal
[SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH]
No
Replace the compressor.
Is the compressor
No
operation time more than
10 seconds?
Check the refrigerant circuit.
(compressor lock-out)
63
No
Replace the compressor.
Yes
Ohmmeter indication
"
Normal
(1~several ")
X1
"
Abnormal
(0" ····· short)
X1
"
Abnormal
(infinite····· open)
X1
Outdoor fan starts
0 second
Abnormal
(Compressor winding short or layer short)
(compressor connector poor contact)
(compressor lock-out)
10 seconds
Abnormal
(Refrigerant circuit defect, etc.)
Normal
5 min.
WHT RED BLK
2 3
1
W
V
U
Compressor motor