Reverse Valve; Temperature Sensor - LG MULTI V IV ARNU07GTU 2 Series Service Manual

Checking Method for Key Components

2.11 Reverse Valve

1. Keep it off before the outdoor unit is powered on and the indoor unit is turned on.
2. Cooling, defrosting, oil recovery : OFF, heating : ON
3. When alternating cooling to heating, transform 4 way valve during re-starting for 3 minutes.
4. To check the mode of cooling/heating operation of 4 way valve, touch the piping surface of low pressure service valve.
5. Refrigerant flowchart of 4 way valve
[Heating Operation]
6. Insulation resistance in the state of connecting the valve to coil should be over 100mΩ when measure it with DC
mega tester(DC 500V).

2.12 Temperature Sensor

1) outdoor temperature sensor : TH1
2) Pipe temperature sensor : TH2
3) Discharge pipe(D-pipe) temperature sensor : TH3
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.
10KΩ±1%(25℃)
Resistance
1.07KΩ±3.3%(85℃)
Copyright ©2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Indoor Heat
Exchanger
Outdoor Heat
Exchanger
[Cooling Operation]
TH1
5KΩ±1%(25℃)
535KΩ±3.3%(85℃)
Outdoor Heat
Exchanger
TH2
200KΩ±1%(25℃)
28KΩ±7.7%(85℃)
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D : Discharge
E : Evaporator
C : Condensor
S : Suction
TH3
LGE Internal Use Only