105
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.)
Compressor = OFF
Compressor Frequency
Reduce
Compressor Frequency
Maintain
Free
103°C
99°C
96°C
88°C
87°C
86°C
Comp. temperature
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 0.75A and 0.95A
(Z20 ~ 42TK), 1.38A and 1.65A (Z50TK), 1.89A and 2.75A (Z60TK), 1.88A and 2.85A (Cooling), 2.85A and
3.57A (Heating) (Z71 ~ 80TK).
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
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