Fujitsu General AOHG45KRTA, Service Manual, Page: 96 / 154

1-2. Heating operation
A sensor (room temperature thermistor) built in indoor unit body will usually perceive difference or
variation between setting temperature and present room temperature, and controls operation rota-
tion number of compressor.
• If the room temperature is 6.0 °C lower than a set temperature, the operation rotation number of
compressor will attain to maximum performance.
• If the room temperature is 1.0 °C higher than a set temperature, the compressor will be stopped.
• When the room temperature is within the range of +1.0°C to -6.0°C of the setting temperature, the
rotation number of compressor is controlled within the range shown below.
• Rotation number range of compressor
Unit: rps
Model name Minimum frequency Maximum frequency
ARXG45KHTB
ARXG54KHTB
17 120
1-3. Dry operation
The rotation number of compressor shall change according to the temperature, set temperature, and
room temperature variation which the room temperature sensor of the indoor unit has detected as
shown in the table below.
Zone is defined by set temperature and room temperature.
• Rotation number range of compressor
Unit: rps
Model name Outdoor temperature zone Operating frequency
ARXG45KHTB
ARXG54KHTB
X zone 33
J zone 33
Y zone 0
• Compressor control based on room temperature
Ts+0.5°C
Ts -1.5 °C
Ts-0.5 °C
Ts+1.5 °C
X zone
J zone
Y zone
Room temperature drops
Room temperature rises
Ts: Set temperature
1-2. Heating operation
- (04-2) -
1. Rotation number control of compressor
CONTROL AND FUNCTIONS CONTROL AND FUNCTIONS