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15.1.4 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 103°C, compressor will be stopped, occurs 4 times per 20 minutes,
timer LED will be blinking. (“F97” is indicated.)
15.1.5 Low Pressure Prevention Control (Gas Leakage Detection)
Control start conditions
o
For 5 minutes, the compressor continuously operates and outdoor total current is between 0.36A and 0.54A.
o
During Cooling and Soft Dry operations:
Indoor suction temperature - indoor piping temperature is below 4°C.
o
During Heating operations :
Indoor piping temperature - indoor suction is under 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.
15.1.6 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.
15.1.7 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
Frequency
103°C
88°C
Free
Compressor = OFF
Compressor Frequency
Reduce
Compressor Frequency Limited
Comp. Discharge Temp
99°C
87°C
96°C
86°C
