47
(How to check inverter/compressor)
Start
Check voltage
between terminals.
Are voltages
balanced?
Check
compressor.
Disconnect the connector between compressor and IPM.
Check resistance of IPM.
See
C
'Check of compressor.'
No
See
A
'Check of open phase.'
See
B
'Check of transistor module.'
Is resistance
infinite?
Yes
Outdoor electronic control
P.C. board is defective
IPM is defective.
Replace outdoor
electronic control P.C.
board and IPM.
No
(0~several
"
)
Check of open phase
A
●
Be sure to use the analog voltmeter for measurement
●
With the connector between compressor and transistor module
disconnected, activate the inverter and measure the balance of
voltage between terminals.
Output voltage : 120V
<< Operation method>>
Start heating opration by pressing the Emergency operation switch
on the indoor unit. (test-run mode)
<<Measurement point>>
at 3 points
BLK-WHT
BLK-RED
WHT-RED
NOTE Measure AC voltage, at 3 points more than one minute ofter
the outdoor fan motor starts running.
Check of IPM
B
●
Disconnect the connector between compressor and IPM, and
measure resistance between terminals on the IPM.
<<Measurement point>>
at 6 points
BLK-WHT, WHT-BLK
BLK-RED, RED-BLK
WHT-RED, RED-WHT
at 6 points
<<Judgment>>
Infinite [
"
]···········normal
0~dozens of ······abnormal (short)
w
Measure resistance between
the lead wires at 3 points
ohmmeter indication
normal
(infinite)
abnormal
(0~dozens of
"
)
X1
"
X1
"
2.5 seconds OFF
9 flashes
<Outdoor electronic control P.C. board>
LED
IPM
PFC
Note 1. Output voltage changes depending power supply
voltage. (Max.
i
10%)
2. Measure by analogue tester.
3. During the measurement, LED in the outdoor electronic
control P.C. board flashes 9 times.
flash
Yes