LG ACHH Series Manual page 42

The phenomena from main component failure
n Temperature Sensor
1) outdoor temperature sensor : TH1
2) Suction pipe(S-pipe) temperature sensor : TH2
3) Discharge pipe(D-pipe) temperature sensor : TH3
4) Outdoor heat exchanger (center of condenser) temperature sensor :TH2
1. Check the condition of installation and the contact of temperature sensor.
2. Check whether the connector contact of temperature sensor is normal.
3. Measure the resistance of temperature sensor.
10 KΩ±1 %(25 ℃)
Resistance
1.07 KΩ±3.3 %(85 ℃)
n 4Way valve
1) It maintains OFF state until power is applied and the product is turned on.
2) During the cooling operation, defrost operation, and oil recovery: OFF, during heating operation: ON
3) If it is changed from cooling operation to heating operation, it is activated for 3 minutes and converts 4Way
valve.
4) You can check whether 4Way valve is in cooling/heating operation mode by touching the service valve pipe sur-
face.
5) 4Way valve refrigerant flow diagram
6) While the coil is mounted on the valve, insulation resistance shall be 100MΩ or more when it is measured with
DC mega tester (DC 500 V).
TH1
5 KΩ±1 %(25 ℃)
535 KΩ±3.3 %(85 ℃)
D
C
E
S-Pipe Outdoor heat
exchanger
[During heating operation]
TH2
28 KΩ±7.7 %(85 ℃)
D
Indoor heat
E
exchanger
S-Pipe
[During cooling operation]
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TH3
200 KΩ±1 %(25 ℃)
C
Outdoor heat
exchanger