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
For 5 minutes, the compressor continuously operates and outdoor total current is between 0.75A and 0.95A
o
(Z20 ~ 42VK), 1.38A and 1.65A (Z50VK), 1.89A and 2.75A (Z60VK), 1.88A and 2.85A (Cooling), 2.85A and
3.57A (Heating) (Z71 ~ 80VK).
During Cooling and Soft Dry operations:
o
Indoor suction temperature - indoor piping temperature is below 4.0°C.
During Heating operations :
o
Indoor piping temperature - indoor suction is under 5.0°C.
Control contents
Compressor stops (and restart after 3 minutes).
o
If the conditions above happen 2 times within 20 minutes, the unit will:
o
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.
Indoor intake air (°C)
Outdoor air (°C)
Indoor heat exchanger (°C)
103.0°C
99.0°C
96.0°C
Comp. temperature
Temperature, T, for:
Compressor = OFF
88.0°C
Compressor Frequency
Reduce
87.0°C
Compressor Frequency
Maintain
86.0°C
Free
Cooling/Soft Dry
T < 14.0 or T ≥ 30.0
T < 13.0 or T ≥ 38.0
T < 30.0
105
Heating
T < 14.0 or T ≥ 28.0
T < 4.0 or T ≥ 24.0
T < 0.0