Overload Protection Control; 4-Way Valve Control; Hot Start Control - Panasonic CS-A18JKD Service Manual

13.10. Overload Protection Control

• Outdoor Fan Control
- If the temperature of the Outdoor Heat Exchanger less than -3°C, Outdoor Fan is ON. The Outdoor Fan stop, when Outdoor
Heat Exchanger temperature is Tb or more according to Outdoor Air Temperature region as table below:
The Outdoor Fan restarts when the indoor heat exchanger temperature falls to 49°C.
During starting of Heating mode and after deice, Outdoor Fan ON for 90 sec. (Hi).
• Compressor High Pressure Control
- If the indoor heat exchanger becomes 68°C or more, the compressor will stop and restart automatically.
- Time Delay Safety Control is activated before the compressor restart.

13.11. 4-Way Valve Control

• 4-way valve always on during Heating operation. (except deicing operation)
• When the unit is switched off by remote control during Heating operation, the 4-way valve stay at Heating position for 5 minutes.
• This is to prevent the refrigerant flow process sound for being occur.

13.12. Hot Start Control

• Hot Start Control is to prevent cool air discharge into the room when heating operation start.
• When Heating operation starts, Indoor fan will not start until the indoor heat exchanger reaches 30°C as diagram shown.
• Hot start is completed when indoor heat exchanger rises to 42°C or operation over 4 minutes.
44