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14.20 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 (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 = Indoor heat exchange temperature - Intake air temperature (heating mode)
▲T = Intake air temperature - Indoor heat exchanger temperature (cooling mode)
• This is to prevent compressor from rotate reversely when there is an instantaneous power failure.
• If this condition happens continuously for 5 times within 50 minutes, unit will turn OFF with TIMER LED blinks.
• The 5 Times counter can be reset when either one of the following condition happen:
o Unit is OFF by remote control or AUTO OFF/ON button.
o Indoor intake temperature – Indoor piping temperature > 5°C for one minute or more.
o Operation mode change.
• The unit could be ON by pressing OFF/ON button at remote control but the TIMER LED will continue blinking.
• TIMER LED blinking will be reset if:
o Indoor intake temperature – Indoor piping temperature > 5°C for one minute or more.
o Power supply reset.
14.21 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.
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