Low Pressure Protection Control - Panasonic WH-SXH09D0E8 Service Manual

13.1.6 High Pressure Sensor Control
Purpose:
- To protect the system operation.
Detection period:
- After compressor on for 1 minute.
Detection conditions:
- When abnormal high voltage detection, 5V or when open circuit detection 0V for 5 seconds continuously.
After detection:
- When abnormality is detected continue 5 seconds, unit stop operation.
- OFF/ON control panel LED will blink (H64 error occurs).
13.1.7 Outside Temperature Current Control
13.1.8 Crank Case Heater Control
Purpose:
- For compressor protection during low outdoor ambient operation (during heating low temperature operation).
Control content:
a. Trigger heater START condition
When the outdoor air temperature is 4°C or below, and discharge temperature is 11.6°C or below.
o
b. Resetting heater STOP condition
When the outdoor air temperature above 6°C.
1.
When the discharge temperature above 18.9°C.
2.
13.1.9

Low Pressure Protection Control

Purpose:
- To protect the system operation.
- Detection period:
- After compressor on for 5 minutes.
Detection conditions:
- When detection of Tem above 26°C.
- Calculation of average evaporation temperature (Tem).
- Use outdoor piping temperature sensor.
Tem use the value calculated for discharge temperature setting value.
After detection:
- Compressor stops restart again after 3 mins.
- When abnormalities continuously generated 60 times within 480 minutes, system stops.
- Protection operation is prohibited.
- Error H42 will be displayed.
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