Compressor Reverse Rotation Protection Control; Dew Prevention Control; Minutes Time Save Control; Compressor Overload Protection Control - Panasonic CS-A9MKD Service Manual

13.6 Compressor Reverse Rotation Protection Control

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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 (cooling mode)/5°C (heating mode) or less for continuous 2
minutes, compressor will stop and restart automatically.
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Time Delay Safety Control is activated before the compressor restart.
▲T = Intake air temperature - Indoor heat exchanger temperature
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This is to prevent compressor from rotate reversely when there is an instantaneous power failure.

13.7 Dew Prevention Control

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To prevent dew formation at indoor unit discharge area.
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This control will be activated if:-
Cooling mode or Quiet mode.
o
Remote Control setting temperature is less than 25°C.
o
Fan speed is at CLo or QLo.
o
Room temperature is constant (±1°C) for 30 minutes.
o
Compressor is continuously running.
o
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Fan speed and angle of horizontal louver (vertical airflow angle) 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.
o
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Dew prevention stop condition.
Remote control setting temperature is more than 25°C.
o
Fan speed is not set at CLo or QLo.
o
Select Powerful operation.
o

13.8 30 Minutes Time Save Control

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The compressor will start automatically if it has stopped for 30 minutes and the intake air temperature falls
between the compressor OFF temperature and compressor ON temperature during the period.
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This is to maintain the room temperature as set. Despite of this, it is to prevent a wrong judgement of intake air
temperature due to poor installation near the sensor area.

13.9 Compressor Overload Protection Control

Outdoor Fan Control
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If the temperature of the indoor heat exchanger rises to 51°C, outdoor fan stops. The outdoor fan restarts when
the indoor heat exchanger temperature falls to 49°C.
Compressor high pressure protection
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If the indoor heat exchanger becomes 65°C or more, the compressor will stop and restart automatically.
(Time Delay Safety Control - 4 minutes waiting).
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This is to reduce the pressure, as to reduce the indoor heat exchanger temp. Nevertheless, is to protect the
compressor from overload of too high temperature.

13.10 4-Way Valve Control

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