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12.10 Freeze Prevention Control
• When indoor heat exchanger temperature is lower than 32°F continuously for 6 minutes, compressor will stops
operation.
• Compressor will resume its operation 3 minutes after the indoor heat exchanger is higher than 55.4°F.
• At the same time, indoor fan speed will be higher than during its normal operation.
• If the indoor heat exchanger temperature is higher than 55.4°F for 5 minutes, the fan speed will return to its
normal operation.
12.11 Freeze Prevention Control 2
• Control start conditions
o During Cooling operation and soft dry operation
During thermo OFF condition, indoor intake temperature is less than 50°F or
Compressor stops for freeze prevention control
o Either one of the conditions above occurs 5 times in 60 minutes.
• Control contents
o Operation stops
o Timer LED blinks and “H99” indicated
12.12 Dew Prevention Control
• To prevent dew formation at indoor unit discharge area.
• This control will be activated if:
o Outdoor air temperature and indoor pipe temperature judgment by micro controller is fulfilled.
o When cooling or dry mode is operated more than 20 minutes.
• This control stopped if:
o Compressor stopped.
o Remote control setting changed (fan speed/temperature).
o Outdoor air temperature and indoor intake temperature changed.
• Fan speed, angle of louver (vertical airflow angle) will be adjusted accordingly in this control.
o Fan speed will be increased slowly when control is activated until predetermine value.
• Compressor frequency will be regulated accordingly.