Heating - Mitsubishi Electric SUZ-KA25VA3 Technical & Service Manual

d Check of compressor winding
●Disconnect the connector between the compressor and intelligent power module, and measure the resistance between the
compressor terminals.
<<Measurement point>>
at 3 points
BLK-WHT
* Measure the resistance between the lead wires at 3 points.
BLK-RED
WHT-RED
<<Judgement>>
Refer to 11-4.
0 [Ω] ················Abnormal [short]
Infinite [Ω] ·······Abnormal [open]
NOTE: Be sure to zero the ohmmeter before measurement.
e Check of compressor operation time
● 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 EMERGENCY
OPERATION switch on the indoor unit. (TEST RUN OPERATION:
Refer to 11-5 b.)
<<Measurement>>
Measure the time from the start of compressor to the stop of
compressor due to overcurrent.
f Check of compressor start failure
Confi rm that ~ is normal.
•Electrical circuit check
. Contact of the compressor connector
. Output voltage of inverter P.C. board and balance of them (See 11-5 b.)
. Direct current voltage between JP715(+) and JP30(-) on the inverter P.C.board
. Voltage between outdoor terminal block S1-S2
Does the compressor run for 10 seconds or
more after it starts?
No
After the compressor is heated with a drier,
does the compressor start?
Yes
Compressor start failure. Activate pre-heat control.
OCH530
Check the refrigerant circuit.
Yes
Check the stop valve.
Replace the compressor.
No
1
<<Judgement>>
0 second
1 second
2 seconds
10 seconds
10 minutes
40
[SUZ-KA60/71VA3.TH]
Compressor starts
Abnormal
(IPM failure)
(Compressor winding short)
Abnormal
(Compressor lock out)
(Starting defect)
Abnormal
(Poor contact,)
(Outdoor P.C. board defect)
(Disconnected connector)
Abnormal
(Refrigerant circuit defect)
(Closed valve)
Normal
*1
Heat the compressor with
a drier for about 20 minutes.
Do not recover refrigerant
gas while heating.
Heating part