80
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, timer
LED will be blinking. (“F97” is indicated.)
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
(Z25/35UFEAW), 1.38A and 1.65A (Z50UFEAW).
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.
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
Compressor = OFF
Compressor Frequency
Reduce
Compressor Frequency
Maintain
Free
Comp. temperature
103°C
99°C
96°C
88°C
87°C
86°C
