Compressor Reverse Rotation Protection Control; Dew Prevention Control - Panasonic CS-PC12MKF Service Manual

• (For PC12MKF only)
The current fan speed will change to freeze prevention speed after 70 seconds compressor on. The fan speed will be increased
according to the indoor pipe temperature the figure below.

13.6. Compressor Reverse Rotation Protection Control

• If the compressor is operating continuously for 5 minutes or longer and the temperature difference between intake air and indoor
heat exchanger is 2.5°C or less for continuous 2 minutes, compressor will stop and restart automatically.
• Time Delay Safety Control is activated before the compressor restart.
• This is to prevent compressor from rotate reversely when there is an instantaneous power failure.
• If this condition happens continuously for 5 times within 50 minutes, unit will turns off with TIMER LED blinks.
• The 5 times counter can be reset when either one of the following condition happen:
- Unit is OFF by remote control or AUTO OFF/ON button.
- Indoor intake temperature - indoor piping temperature >5°C for 1 minute or more.
- Operation mode change.
• The unit could be ON by pressing OFF/ON button at remote control but the TIMER LED will continue blinking.
• TIMER LED blinking will reset if:
- Indoor intake temperature - indoor piping temperature >5°C for 1 minute or more.
- Power supply reset.

13.7. Dew Prevention control

• To prevent dew formation at indoor unit discharge area.
• This control will be activated if:-
- Cooling mode.
- Remote Control setting temperature is less than 25°C.
- Fan speed is at CLo.
- Room temperature is constant (±1°C) for 60 minutes (PC12MKF) or 30 minutes (PC18/24MKF).
- Compressor is continuously running.
• Fan speed will be adjusted accordingly in this control.
- Fan speed will be increased slowly if the unit is in quiet mode but no change in normal cooling mode.
• Dew prevention stop condition
- Remote control setting temperature is more than 25°C.
- Fan speed is not set to CLo.
50