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13.1.4 Compressor Overheating Prevention Control
Instructed frequency for compressor operation will be regulated by compressor top temperature. The changes of
frequency are as below.
If compressor top temperature exceeds 107°C (224.6°F), 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 4°C (7.2°F).
o During Heating operations:
Indoor piping temperature - indoor suction is under 5°C (9°F).
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 (°F) T < 14 (57.2) or T ≥ 30 (86) T < 14 (57.2) or T ≥ 28 (82.4)
Outdoor air °C (°F) T < 13 (55.4) or T ≥ 38 (100.4) T < 4 (39.2) or T ≥ 24 (75.2)
Indoor heat exchanger °C (°F) T < 30 (86) T ≥ 0 (32)
Compressor = OFF
Compressor Frequency
Reduce
Compressor Frequency
Maintain
Free
107°C (224.6°F)
103°C (217.4°F)
100°C (212°F)
92°C (197.6°F)
91°C (195.8°F)
90°C (194°F)
Comp. top temperature
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