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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 103°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)
A. Control start conditions
o For 5 minutes, the compressor continuously operates and outdoor total current is between 1.38A and 1.65A
(RE18PKR), 1.88A and 2.85A (RE24PKR, RE28PKR) (Cool) or 2.85A and 3.57A (RE24PKR, RE28PKR)
(Heat).
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.
B. 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 < 4 or T 28
Outdoor air (°C)
T < 13 or T
38 T < 4 or T 24
Indoor heat exchanger (°C) T < 30
T
0
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