Rotation Number Control Of Compressor; Cooling Operation - Fujitsu ARXG45KHTA Service Manual

1. Rotation number control of compressor

1-1. Cooling operation

A sensor (room temperature thermistor) built in the indoor unit body will usually perceive difference
or variation between a set temperature and present room temperature, and controls the operation
rotation number of the compressor.
• If the room temperature is 2.0 °C higher than a set temperature, the operation rotation number of
compressor will attain to maximum performance.
• If the room temperature is -2.5 °C lower than a set temperature, the compressor will be stopped.
• →hen the room temperature is within the range of +2.0°C to -2.5°C of the setting temperature, the
rotation number of compressor is controlled within the range shown in the table below. However,
the maximum rotation number is limited in the range shown in the figure below based on the in-
door fan mode and the outdoor temperature.
• Rotation number range of compressor
Model name
AR↓G45KHTA
AR↓G54KHTA
• Limit of maximum speed based on outdoor temperature
Model name
AR↓G45KHTA
AR↓G54KHTA
1-1. Cooling operation
Minimum frequency
Outdoor
temperature drops
A zone
34°C
B zone
30°C
C zone
19°C
D zone
10°C
E zone
0°C
F zone
Outdoor
temperature zone
A zone
B zone
C zone
D zone
E zone
F zone
A zone
B zone
C zone
D zone
E zone
F zone
- (04-1) -
17 rps
Outdoor
temperature rises
36°C
32°C
21°C
12°C
2°C
Indoor unit fan mode
HIGH MED
86 75
86 75
80 51
51 46
51 46
51 46
86 80
86 80
80 56
51 46
51 46
51 46
Maximum frequency
86 rps
Unit: rps
LOW
71
71
51
41
41
41
71
71
51
41
41
41
1. Rotation number control of compressor