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16.1.4 Compressor Overheating Prevention Control
Instructed frequency for compressor operation will be regulated by compressor temperature. The changes of
frequency are as below.
If compressor temperature exceeds 103°C, compressor will be stopped, occurs 4 times per 20 minutes
(“F97” is indicated.)
Compressor = OFF
Compressor Frequency
Reduce
Compressor Frequency
Maintain
Free
Comp. temperature
103°C
99°C
96°C
88°C
87°C
86°C
16.1.5 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
(Z25/35UB4), 1.38A and 1.65A (Z50/60UB4).
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
“F91” indicated.
16.1.6 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.
16.1.7 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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