Heating Operation; Dry Operation - Fujitsu ABHG54KRTA Service Manual

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 fre-
quency of compressor.
• If the room temperature is 6.0 °C lower than a set temperature, the compressor operation frequen-
cy 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
compressor frequency is controlled within the range shown below.
• Compressor frequency range
Model name
ABHG54KRTA

1-3. Dry operation

The compressor rotation frequency 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.
• Compressor frequency range
Model name
ABHG54KRTA
• Compressor control based on room temperature
1-2. Heating operation
Minimum frequency
Outdoor temperature zone
Room temperature drops
X zone
Ts+0.5°C
J zone
Ts -1.5°C
Y zone
17
X zone
J zone
Y zone
Room temperature rises
Ts: Set temperature
- (04-2) -
Unit: rps
Maximum frequency
120
Unit: rps
Operating frequency
33
33
0
Ts+1.5°C
Ts-0.5°C
1. Compressor frequency control