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14.1.4 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 224.6°F (107°C), compressor will be stopped, occurs 4 times per
20 minutes, timer LED will be blinking. (“F97” is indicated.)
14.1.5 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.
o
During Cooling and Soft Dry operations:
Indoor suction temperature - indoor piping temperature is below 7.2°F (4°C).
o
During Heating operations :
Indoor piping temperature - indoor suction is under 9°F (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.
14.1.6 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.
14.1.7 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
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
Compressor = OFF
Compressor Frequency
Reduce
Compressor Frequency
Maintain
Free
224.6°F (107°C)
217.4°F (103°C)
(221°F (105°C))
212°F (100°C)
(203°F (95°C))
197.6°F (92°C)
195.8°F (91°C)
194°F (90°C)
(185°F (85°C))
Comp. temperature
(Comp. Discharge temperature)
