25
TCH030
TCH030
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
BLK-RED
WHT-RED
<<Judgement>>
Refer to "11-4. TROUBLE CRITERION OF MAIN PARTS".
0 [Ω] ················Abnormal [short]
Infinite [Ω] ·······Abnormal [open]
NOTE
: Be sure to zero the ohmmeter before measurement.
Measure the resistance between the lead wires at 3 points.
E Check of compressor operation time
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
0 second
1 second
2 seconds
10 seconds
10 minutes
<<Judgement>>
Connect the compressor and activate the inverter. Then measure
the time until the inverter stops due to overcurrent.
<<Operation method>>
Start heating or cooling test run.
(TEST RUN OPERATION : Refer to 11-5 .)
<<Measurement>>
Measure the time from the start of compressor to the stop of
compressor due to overcurrent.
Is the resistance of thermistor normal?
(SA71: “11-6. TEST POINT DIAGRAM AND VOLTAGE”.)
Disconnect the connector of thermistor in the outdoor P.C. board (see
below table), and measure the resistance of thermistor.
Replace the thermistor except RT64.
When RT64 is abnormal, replace the inverter
P.C. board.
Reconnect the connector of thermistor.
Turn ON the power supply and press EMERGENCY OPERATION switch.
No
Yes
F Check of outdoor thermistors
Does the unit operate for 10 minutes or more
without showing thermistor abnormality?
Yes
OK
(Cause is poor contact.)
No
Replace the inverter P.C. board.
Thermistor
Symbol
Connector, Pin No.
Board
SUZ-SA71VA3.TH
SUZ-SA100VA2.TH
Defrost
RT61
Between CN671 pin1 and pin2
Inverter
P.C. board
Discharge temperature
RT62
Between CN671 pin3 and pin4
Fin temperature
RT64
Between CN673 pin1 and pin2
Ambient temperature
RT65
Between CN672 pin1 and pin2
Outdoor heat exchanger temperature RT68
Between CN671 pin5 and pin6
