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13.1.5 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 233.6°F, compressor will be stopped, occurs 4 times per
20 minutes, timer LED will be blinking. “F97” is indicated.
13.1.6 Low Pressure Protection Control (Gas Leakage Detection)
For 5 minutes, the compressor continuously operates and outdoor total current is between 0.78A and 1.16A.
During Cooling and Soft Dry operation:
Indoor suction temperature – indoor piping temperature is below 39.2°F.
During Heating operations :
Indoor piping temperature - indoor suction is under 41.0°F.
13.1.7 Low Frequency Protection Control 1
When the compressor operates at frequency lower than 25Hz continued for 240 minutes, the operation frequency
will be changed to 24Hz for 2 minutes.
13.1.8 Low Frequency Protection Control 2
When all below conditions comply, minimum limit of compressor will be set.
E18NKUA, E24NKUA
Temperature, T, for: Cooling / Soft Dry Heating
Indoor intake air (°F) T < 57.2 or T ≥ 86.0 T < 57.2 or T ≥ 82.4
Outdoor air (°F) T < 55.4 or T ≥ 100.4 T < 39.2 or T ≥ 75.2
Indoor heat exchanger (°F) T < 86.0 T ≥ 32.0
13.2 Protection Control For Cooling & Soft Dry Operation
13.2.1 Outdoor Air Temperature Control
The compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the
diagram below.
This control will begin 1 minute after the compressor starts.
Compressor frequency will adjust based on outdoor air temperature.