80
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 (cooling mode)/5°C (heating mode) or less for continuous 2
minutes, compressor will stop and restart automatically.
• Time Delay Safety Control is activated before the compressor restart.
▲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 will be activated if:-
o 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.
• Fan speed and angle of horizontal louver (vertical airflow angle) will be adjusted accordingly in this control.
o Fan speed will be increased slowly if the unit is in quiet mode but no change in normal cooling mode.
• Dew prevention stop condition.
o Remote control setting temperature is more than 25°C.
o Fan speed is not set at CLo or QLo.
o Select Powerful operation.
13.8 30 Minutes Time Save Control
• 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.
• 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
• 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
• If the indoor heat exchanger becomes 65°C or more, the compressor will stop and restart automatically.
(Time Delay Safety Control - 4 minutes waiting).
• 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
• 4-way valve always on during Heating operation. (except deicing operation)
• When the unit is switched off by remote control during Heating operation, the 4-way valve stay at Heating
position for 5 minutes.
• This is to prevent the refrigerant flow process sound for being occur.
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