Panasonic CS-A9KKD-2, Service Manual, Page: 88 / 136

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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:
o
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.
•
Fan speed, angle of horizontal louver (vertical airflow angle) and angle of vertical louver (horizontal airflow angle)
will be adjusted accordingly in this control.
o
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:
•
Dew prevention stop condition
o
Remote control setting temperature is more than 25°C.
o
Fan speed is not set to Lo or QLo.
o
Select Powerful operation.
(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:-
o
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.
13.23 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.