Mitsubishi Electric MUZ-A09YV-E1 Service Manual page 27

Mitsubishi Electric ilmalämpöpumput korjaa ja huoltaa pääkaupunkiseudulla: Jäähdytinpalvelu RefGroup Oy
Check of compressor
D
Start
E "Check of compressor
winding" on page 27.
Is the compressor normal?
Yes
F "Check of compressor
operation time" on page
27. Does the compressor
operate continuously?
Yes
Ok
Check of compressor winding
E
Disconnect the connector (CN61) between compressor and power
transistor module, and measure the resistance between the
compressor terminals.
<<Measurement point>>
at 3 points
BLK-WHT
BLK-RED
WHT-RED
<<Judgement>>
Refer to page 25.
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 page 5.
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>>
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 to the
stop of compressor due to over current.
<<Judgement>>
For reference
0~10 seconds·····················Abnormal (compressor 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 the resistance between the
lead wires at 3 points.
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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
60 seconds
5 minutes
27
Replace the compressor.
WHT
RED BLK
2
V
Normal
(1~several ")
Compressor motor
Abnormal
(0" ····· short)
Abnormal
(infinite····· open)
Outdoor fan starts
Abnormal
(Compressor winding short or layer short)
Abnormal
(Compressor lock-out)
Abnormal
(Refrigerant circuit defect, etc.)
Normal
3
1
W
U