80
Check of outdoor thermistors
• When thermistor is abnormal.
Disconnect the connector in the following table and measure
the resistance of the thermistor to check whether the thermistor
is normal or not. (Refer to 11-7.)
Does the unit operate 10 minutes or more without
showing thermistor abnormality?
Replace the thermistor except RT64.
In case that RT64 is abnormal,
replace the inverter P.C. board or
the outdoor power board
since RT64 is combined with those
boards.
Normal
Replace the inverter P.C. board, the
outdoor electronic control P.C. board, or
the outdoor power board.
Normal
Yes
No
Abnormal
Reconnect the connector in the following table and
disconnect the lead wire leading to the compressor.
3 minutes after turning ON the power supply,
start EMERGENCY OPERATION.
Thermistor
Defrost
Discharge temperature
Outdoor heat exchanger temperature
Ambient temperature
Fin temperature
Symbol
RT61
RT62
RT68
RT65
RT64
Connector, Pin No.
Between CN661 pin1 and pin2
Between CN661 pin3 and pin4
Between CN661 pin7 and pin8
Between CN663 pin1 and pin2
Between CN3 pin1 and pin2
Outdoor electronic control P.C. board
Outdoor power board
Board
Thermistor
Defrost
Discharge temperature
Outdoor heat exchanger temperature
Fin temperature
Ambient temperature
Symbol
RT61
RT62
RT68
RT64
RT65
Connector, Pin No.
Between CN661 pin1 and pin2
Between CN661 pin3 and pin4
Between CN661 pin5 and pin6
Between CN662 pin1 and pin2
Between CN663 pin1 and pin2
Inverter P.C. board
Board
MXZ-3B54/3B68/4B71/4B71/5B100VA
MXZ-2B30/2B40/2B52VA
OBH554D
Summary of Contents for MXZ-2B30VA
Page 19: ...19 WIRING DIAGRAM 6 MXZ 2B30VA MXZ 2B40VA MXZ 2B52VA TB3 TB2 TB1 OBH554D ...
Page 20: ...20 MXZ 3B54VA OBH554D ...
Page 21: ...21 MXZ 3B68VA OBH554D ...
Page 22: ...22 MXZ 4B71VA OBH554D ...
Page 23: ...23 MXZ 4B80VA OBH554D ...
Page 24: ...24 MXZ 5B100VA OBH554D ...