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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 141.8°F (61°C).
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 32°F (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 41°F (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 41°F (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 50°F (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.