105
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
power board since RT64 is combined
with the board.
Normal
Replace the inverter P.C. board, electronic
control P.C. board, control P.C. board,
outdoor control P.C. board, or the 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
Electronic control P.C. board
Power board
Board
MXZ-3C54/3C68/4C71/4C80/5C100VA MXZ-4C80/5C100VA2
Thermistor
Defrost
Discharge temperature
Outdoor heat exchanger temperature
Ambient temperature
Symbol
RT61
RT62
RT68
RT65
Connector, Pin No.
Between CN661 pin1 and pin2
Between CN661 pin3 and pin4
Between CN661 pin5 and pin6
Between CN663 pin1 and pin2
Control P.C. board
Board
MXZ-6C120VA
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-2C30/2C40/2C52VA
Thermistor
Defrost
Discharge temperature
Outdoor heat exchanger temperature
Ambient temperature
Symbol
RT61
RT62
RT68
RT65
Connector, Pin No.
Between CN661 pin1 and pin2
Between CN661 pin3 and pin4
Between CN661 pin5 and pin6
Between CN663 pin1 and pin2
Outdoor control P.C. board
Board
MXZ-6C122VA
OBH584G
Summary of Contents for MXZ-2C30VA
Page 24: ...24 WIRING DIAGRAM 6 MXZ 2C30VA MXZ 2C40VA MXZ 2C52VA OBH584G ...
Page 25: ...25 MXZ 3C54VA OBH584G ...
Page 26: ...26 MXZ 3C68VA OBH584G ...
Page 27: ...27 MXZ 4C71VA OBH584G ...
Page 28: ...28 MXZ 4C80VA OBH584G ...
Page 29: ...29 MXZ 4C80VA2 OBH584G ...
Page 30: ...30 MXZ 5C100VA OBH584G ...
Page 31: ...31 MXZ 5C100VA2 OBH584G ...
Page 32: ...32 MXZ 6C120VA E1 OBH584G ...
Page 33: ...33 MXZ 6C120VA E2 OBH584G ...
Page 34: ...34 MXZ 6C122VA E1 OBH584G ...
Page 35: ...35 MXZ 6C122VA ER1 OBH584G ...
Page 36: ...36 MXZ 6C122VA E2 OBH584G ...
Page 37: ...37 MXZ 6C122VA ER2 OBH584G ...