Checking The Four-Way Reverse Valve; Checking The Temperature Sensors - LG Multi V5 Service Manual

TEMPERATURE SENSORS

Checking the Four-Way Reverse Valve

1. The four-way reverse valve must be OFF before the outdoor and
indoor units are powered up and turned on.
2. The four-way reverse valve must be OFF during cooling, defrost,
and oil recovery operation. The four-way reverse valve must be
ON during heating operation.
3. When switching from cooling to heating operation, the four-way
valve position changes during the three minute mode change
restart.
4. To check if the four-way reverse valve is operating in cooling
or heating mode, touch the piping surface of the low pressure
service valve.
5. See diagram at right for the refrigerant flowchart of the four-way reverse valve.
6.
500V]).

Checking the Temperature Sensors

• Outdoor Temperature Sensor: TH1
• Pipe Temperature Sensor: TH2
• Discharge Pipe (D-pipe) Temperature Sensor: TH3
1. Check the temperature sensor installation and connections.
2. Check if the connection contact of the temperature sensor is normal.
3. Measure the resistance of temperature sensor.
Table 67: Temperature Sensor Resistance Values.
Temperature Sensor
Resistance
124
TH1
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
Figure 62: Refrigerant Flowchart of the Four-Way Reverse Valve.
Indoor Heat
Exchanger
Outdoor Heat
Exchanger
Heating Operation
TH2
D : Discharge
Outdoor Heat
E : Evaporator
Exchanger
C : Condensor
Cooling Operation
S : Suction
TH3