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14.5 Compressor Overheating Prevention Control
Instructed frequency for compressor operation will be regulated by compressor temperature. The changes of
frequency are as below.
If compressor temperature exceeds 107°C, compressor will be stopped, occurs 4 times per 20 minutes, timer
LED will be blinking. “F97” is indicated.
Compressor=OFF
Compressor Frequency
Reduced
Compressor Frequency
Maintain
Free
Comp Tank temperature
107°C
91°C
103°C
100°C
92°C
90°C
14.6 Low Pressure Prevention Control (Gas Leakage Detection)
Control start conditions
o For 5 minutes, the compressor continuously operates and outdoor total current is between 0.65 A and 1.65 A.
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.
14.7 Low Frequency Protection Control 1
When the compressor operates at frequency lower than 24 Hz continued for 240 minutes, the operation
frequency will be changed to 23 Hz for 2 minutes.
14.8 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 < 14 or T ≥ 30
Outdoor air (°C) T < 13 or T ≥ 38
Indoor heat exchanger (°C) T < 30
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