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15.2 Protection Control For Cooling & Soft Dry Operation
15.2.1 Outdoor Air Temperature Control
The maximum current value is regulated when the outdoor air temperature rise above 57.2°F in order to avoid
compressor overloading.
The compressor will be stopped at outdoor air temperature ≤ -4°F. The unit still operate within the temperature
range.
15.2.2 Cooling Overload Control
Pipe temperature limitation / restriction.
o Detects the outdoor pipe temperature and carry out restriction / limitation below (Limit the compressor
operation frequency)
o The compressor stops if outdoor pipe temperature exceeds 141.8°F.
o If the compressor stops 4 times in 20 minutes, Timer LED blinks (“F95” indicated: Outdoor high pressure rise
protection)
15.2.3 Freeze Prevention Control 1
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 41°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.
15.2.4 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 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
101.3°F
99.5°F
Compressor OFF
Compressor ON
Outdoor Air Temperature
-0.4°F
-4°F
Compressor OFF
Compressor ON
O
utdoor Air Temperature
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