Compressor Reverse Rotation Protection Control; Dew Prevention Control; Restart Control (Time Delay Safety Control) - Panasonic CS-A9MKD Service Manual

13.20 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.
s T = Intake air temperature - Indoor heat exchanger temperature
•
This is to prevent compressor from rotate reversely when there is an instantaneous power failure.

13.21 Dew Prevention Control

•
To prevent dew formation at indoor unit discharge area.
•
This control starts if:
Cooling mode or Quiet mode is activated.
o
Remote Control setting temperature is less than 25°C.
o
Fan speed is at Lo or QLo.
o
Room temperature is constant (±1°C) for 30 minutes.
o
Compressor is continuously running.
o
•
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.
o
The angle of horizontal louver will be changed as table below:
o
The angle of vertical louver will be changed as table below:
o
•
Dew prevention stop condition
Remote control setting temperature is more than 25°C.
o
Fan speed is not set to Lo or QLo.
o
Select Powerful operation.
o
(For 13.22 to 13.23 information applies only to Heating Operation)

13.22 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.
o
•
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.
13.23 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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