Mitsubishi Electric Mr. SLIM MSZ-FA25VA Technical Manual página 336

Resolución de averías
Check of compressor
D
"Check of compressor
winding".
Is the compressor normal?
"Check of compressor
operation time". Does the
compressor operate
continuously?
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
336
[
No
Yes
No
Yes
Ok
(compressor lock-out)
Replace the compressor.
Is the compressor
No
operation time more than
10 seconds?
Yes
Check the refrigerant circuit.
Ohmmeter indication
"
X1
"
X1
"
X1
0 second
10 seconds
5 min.
Replace the compressor.
WHT
2
Normal V
(1~several )
Compressor motor
Abnormal
(0 ····· short)
Abnormal
(infinite····· open)
Outdoor fan starts
Abnormal
(Compressor winding short or layer short)
(compressor connector poor contact)
(compressor lock-out)
Abnormal
(Refrigerant circuit defect, etc.)
Normal
]
RED BLK
3
1
W
U