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12.5 Low Pressure Prevention Control (Gas Leakage Detection)
• Control start conditions
o For 5 minutes, the compressor continuously operates and outdoor total current is between 0.65A and 1.65A.
o During Cooling and Soft Dry operation:
Indoor suction temperature – indoor piping temperature is below 4°C
• Control contents
o Compressor stops (and restart after 3 minutes).
o If the conditions above happened 2 times within 20 minutes, the unit will:
Stop operation
Timer LED blinks and “F91” indicated.
12.6 Compressor Tank Temperature Rise Protection Control
• Control start conditions
o For 5 minutes, the compressor continuously operates and outdoor total current is between 0.65A and 1.65A.
o During Cooling and Soft Dry operation:
Indoor suction temperature -indoor piping temperature is below 4°C.
Indoor temperature and outdoor temperature is 30±5°C.
Remote Control setting 16°C and Hi Fan Speed.
• Control contents
o Compressor stops (and restart after 3 minutes)
o If the conditions above happened 2 times within 20 minutes, the unit will:
Stop operation
Timer LED blinks and “F91” indicated.
12.7 Low Frequency Protection Control 1
• When the compressor operates at frequency lower than 24Hz continued for 20 minutes, the operation frequency
will be changed to 23Hz for 2 minutes.
12.8 Low Frequency Protection Control 2
• When all below conditions comply, the compressor frequency will changed to lower frequency.
Temperature, T, for: Cooling / Soft Dry
Indoor intake air (°C) T < 15 or T ≥ 30
Outdoor air (°C) T < 16 or T ≥ 38
Indoor heat exchanger (°C) T < 30
12.9 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 based on outdoor air temperature.
Free
Limited Frequency
Outdoor air temperature
38°C
37°C
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