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12. Protection Control
12.1 Freeze Prevention control (Cool)
• When received freeze prevention signal from indoor unit, the compressor frequency changes according to indoor
heat exchanger temperature.
• When indoor unit request capability OFF due to freeze condition , immediately the capability supply to targeted
indoor unit stops.
12.2 Dew Prevention control (Cool)
• When received dew prevention signal from indoor unit, the compressor frequency changes according to indoor
intake temperature and indoor heat exchanger temperature.
12.3 Electronic Parts Temperature Rise Protection 1 (Cool)
• This control prevents electronic parts temperature rise during cooling overload condition.
• Start conditions:
o Outdoor ambient temperature is at protection region as shown in figure below:
o Outdoor unit total current is above 5.5A
• Control content
o Outdoor fan speed is adjusted accordingly.
• Control stop condition
o When outdoor ambient temperature is back to normal region.
• During this control, outdoor fan speed does not reduce for Quiet operation.
12.4 Electronic Parts Temperature Rise Protection 2 (Cool)
• This control prevents electronic parts temperature rise during cooling/dry operation.
• Start conditions:
o Total current is at protection region as shown in figure below:
• Control content
o Outdoor fan speed is adjusted accordingly.
• Control stop condition
o When total current is back to normal region.
• During this control, outdoor fan speed does not reduce for Quiet operation.
