Service manual

48
Start
Ok
Replace the compressor.
E 'Check of compressor
winding' on page 48.
Is compressor normal?
No
Replace the compressor.
No
Yes
Yes
F 'Check of compressor
operation time' on page 48.
Does the compressor operate
continuously?
Is the compressor operation
time more than 10 seconds?
No
Check the refrigerant circuit.
Yes
Check of compressor
D
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.
w Measure resistance between the
lead wires at 3 points.
normal
(1~several ")
abnormal
(0" ····· short)
abnormal
(infinite····· open)
Ohmmeter indication
X1
"
X1
"
X1
"
23
W
U
V
1
WHT
Compressor motor
RED BLK
Check of compressor winding
E
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
Outdoor fan starts
Abnormal
(Compressor winding short or layer short)
Abnormal
(Compressor lock-out)
Abnormal
(Refrigerant circuit defect, etc.)
Normal
0 sec.
10 sec.
60 sec.
5 min.
Check of compressor operation time
F
OB297--2.qxp 04.2.4 4:21 PM Page 48