Panasonic WH-SXC09D3E5, Service Manual

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13.1.6. 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.
13.1.7. 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).
13.1.8. Outside Temperature Current Control
13.1.9. Extreme Low Temperature Control
• Purpose:
- To improve the compressor reliablity during cold start and after deice when running in extreme low outdoor temperature
-20 C.
Starting condition:
1. Heating operation
2. Outdoor air tempearture < -10 C
3. Actual frequency
50Hz
4. Compressor discharge temperature < 20 C
When the above condition is fulfilled, this control is activated.
5Hz up every 30 sec. until it reaches the target frequency.
Cancelation condition:
- starting condition not fulfill.
- Cancel the extreme low temperature control when compressor discharge sensor 60 C