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13.2 Protection Control For Cooling & Soft Dry Operation
13.2.1 Outdoor Air Temperature Control
• The compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the
diagram below.
• This control will begin 1 minute after the compressor starts.
• Compressor frequency will adjust base on outdoor air temperature.
13.2.2 Cooling Overload Control
• Detects the Outdoor pipe temperature and carry out below restriction/limitation (Limit the compressor Operation
frequency).
• The compressor stop if outdoor pipe temperature exceeds 61°C (E9/12/15PKEA), 63°C (E18PKEA).
• If the compressor stops 4 times in 20 minutes, Timer LED blinking (F95 indicated: outdoor high pressure rise
protection).
13.2.3 Freeze Prevention Control 1
• When indoor heat exchanger temperature is lower than 0°C continuously for 6 minutes, compressor will stop
operating.
• Compressor will resume its operation 3 minutes after the indoor heat exchanger is higher than 5°C.
• At the same time, indoor fan speed will be higher than during its normal operation.
• If indoor heat exchanger temperature is higher than 5°C for 5 minutes, the fan speed will return to its normal
operation.
13.2.4 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 10°C 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
13.2.5 Dew Prevention Control 1
• 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 microcontroller is fulfilled.
o When Cooling or Dry mode is operated more than 20 minutes or more.
• 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 will be adjusted accordingly in this control.
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