Protection Control For Heating Operation - Panasonic WH-UD30BE5-1 Service Manual

13.1.7. Low Frequency Protection Control 2
• When all the below conditions comply, the compressor frequency will change to lower frequency.
13.1.8. High pressure sensor control
• Purpose:
- To protect the system operation.
• Detection period:
- After compressor on for 5 minutes.
• 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).

13.2. Protection Control For Heating Operation

13.2.1. Outdoor Air Temperature Control
The maximum current value is regulated when the outdoor air temperature rises above 14°C in order to avoid compressor
overloading.
13.2.2. Deice Operation
When outdoor pipe temperature and outdoor air temperature is low, deice operation start where outdoor fan motor stop.
Temperature, T, for:
Outlet water (°C)
Outdoor air (°C)
Indoor heat exchanger (°C)
Heating
T < 14 or T 48
T < 4 or T 24
T 0
36