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Only training and service purposes.
2.8 4 way Valve
2.9 Temperature Sensor
1. Keep it off before the Compressor Module 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
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).
1) Outdoor temperature sensor : TH1
2) Discharge pipe(D-pipe) 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.
3) Pipe temperature sensor : TH3
Checking Method for Key Components
TH1 TH2 TH3
Resistance
10kΩ±1%(25°C) 200kΩ±1%(25°C) 5kΩ±1%(25°C)
1.07kΩ±3.3%(85°C) 28kΩ±7.7%(85°C) 535Ω±3.3%(85°C)
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