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13.1.4 Compressor Overheating Prevention Control
Instructed frequency for compressor operation will be regulated by compressor discharge temperature. The
changes of frequency are as below.
If compressor discharge temperature exceeds 224.6°F (107°C), compressor will be stopped, occurs 4 times per
20 minutes, timer LED will be blinking. (“F97” is indicated.)
13.1.5 Low Pressure Prevention Control (Gas Leakage Detection)
Control start conditions
o For 5 minutes, the compressor continuously operates and outdoor total current is between 0.75A and 0.95A.
o During Cooling and Soft Dry operations:
Indoor suction temperature - indoor piping temperature is below 7.2°F (4°C).
o During Heating operations :
Indoor piping temperature - indoor suction is under 9°F (5°C).
Control contents
o Compressor stops (and restart after 3 minutes).
o If the conditions above happen 2 times within 20 minutes, the unit will:
Stop operation
Timer LED blinks and “F91” indicated.
13.1.6 Low Frequency Protection Control 1
When the compressor operate at frequency lower than 24 Hz continued for 20 minutes, the operation frequency
will be changed to 23 Hz for 2 minutes.
13.1.7 Low Frequency Protection Control 2
When all the below conditions comply, the compressor frequency will change to lower frequency.
Temperature, T, for: Cooling/Soft Dry Heating
Indoor intake air (°C) T < 14 or T ≥ 30 T < 14 or T ≥ 28
Outdoor air (°C) T < 13 or T ≥ 38 T < 4 or T ≥ 24
Indoor heat exchanger (°C) T < 30 T ≥ 0
Temperature, T, for: Cooling/Soft Dry Heating
Indoor intake air (°F) T < 57.2 or T ≥ 86.0 T < 57.2 or T ≥ 82.4
Outdoor air (°F) T < 55.4 or T ≥ 100.4 T < 39.2 or T ≥ 75.2
Indoor heat exchanger (°F) T < 86.0 T ≥ 32.0