Check Of Compressor; Check Of Compressor Winding; Check Of Compressor Operation Time - Mitsubishi Electric Mr.Slim MSZ09UN Service Manual

Check of compressor

D
Start
E 'Check of compressor
winding' on page 48.
Is compressor normal?
Yes
F 'Check of compressor
operation time' on page 48.
Does the compressor operate
continuously?
Yes
Ok

Check of compressor winding

E
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>>
0.92 to 1.14" at - 14°F to 104°F 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 1.05" at 68°F .

Check of compressor operation time

F
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
Is the compressor operation
No
time more than 10 seconds?
Check the refrigerant circuit.
w Measure resistance between the
lead wires at 3 points.
Replace the compressor.
No
Yes
Ohmmeter indication
"
X1
"
X1
"
X1
0 sec.
10 sec.
60 sec.
5 min.
48
Replace the compressor.
WHT
2
normal
(1~several ")
V
abnormal
Compressor motor
(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
RED BLK
3
1
W
U