Compressor Reverse Rotation Protection Control; Dew Prevention Control; Restart Control (Time Delay Safety Control); Compressor Reverse Rotation Protection - Panasonic CS-A18JKD Service Manual

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 2.5qC or less for continuous 2 minutes, compressor will stop and restart automatically.
• Time Delay Safety Control is activated before the compressor restart.
s T = Intake air temperature - Indoor heat exchanger temperature
• This is to prevent compressor from rotate reversely when there is an instantaneous power failure.

13.7. Dew Prevention Control

• To prevent dew formation at indoor unit discharge area.
• This control starts if:
- Cooling mode or Quiet mode is activated.
- Remote Control setting temperature is less than 25qC.
- Fan speed is at Lo or QLo.
- Room temperature is constant (±1qC) for 30 minutes.
- Compressor is continuously running.
• Fan speed, angle of horizontal louver (vertical airflow angle) and angle of vertical louver (horizontal airflow angle) will be adjusted
accordingly in this control.
- Fan speed will be increased slowly if the unit is in quiet mode and Lo fan speed.
- The angle of horizontal louver will be changed as table below:
- The angle of vertical louver will be changed as table below:
• Dew prevention stop condition
- Remote control setting temperature is more than 25qC.
- Fan speed is not set to Lo or QLo.
- Select Powerful operation.
(For 13.8 to 13.14 information applies only to Heating Operation)

13.8. Restart Control (Time Delay Safety Control)

• When the thermo-off temperature (temperature which compressor stops to operate) is reached during:-
- Heating operation - the compressor stops for 3 minutes (minimum) before resume operation.
• If the operation is stopped by the remote control, the compressor will not turn on within 3 minutes from the moment operation
stop, although the unit is turn on again within the period.
• This phenomenon is to balance the pressure inside the refrigerant cycle.
13.9. Compressor Reverse Rotation Protection Control
• If the compressor is operating continuously for 5 minutes or longer and the temperature difference between indoor heat
exchanger and intake air is 5°C or less for continuous 2 minutes, compressor will stop and restart automatically.
• Time Delay Safety Control is activated before the compressor restart.
s T = Indoor heat exchanger temperature - Intake air temperature
• This is to prevent compressor from rotate reversely when there is an instantaneous power failure.
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