Heating Operation; Dry Operation - Fujitsu AUXG18KVLA 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
Connected model name
AOHG36KRTA
AOHG45KRTA
AOHG54KRTA

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
Connected model name
AOHG36KRTA
AOHG45KRTA
AOHG54KRTA
• 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
15 rps
17 rps
17 rps
X zone
J zone
Y zone
X zone
J zone
Y zone
Room temperature rises
Ts: Set temperature
- (04-5) -
Maximum frequency
120 rps
120 rps
120 rps
Unit: rps
Operating frequency
32
32
0
33
33
0
Ts+1.5°C
Ts-0.5°C
1. Compressor frequency control