4 compressor overheating prevention control, 6 low frequency protection control 1, 7 low frequency protection control 2 – Panasonic CS-XE9PKUA User Manual
Page 45
45
13.1.4 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.)
13.1.5 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.
13.1.6 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.
13.1.7 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