Heating Operation; Heating Capacity Control; Dry Operation; Indoor Unit Control - Fujitsu ASTG18KMTC Service Instruction

2. HEATING OPERATION

2-1 HEATING CAPACITY CONTROL

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 frequency of the compressor.
* If the room temperature is lower by 6°C than a set temperature, the compressor operation
frequency will attain to maximum performance.
* If the room temperature is higher 1°C than a set temperature, the compressor will be
stopped.
* When the room temperature is between +1°C to -6°C of the setting temperature,
the compressor frequency is controlled within the range shown in Table2.
( Table2 : Compressor Frequency Range )
AOTG18KMTC
AOTG22KMTC
AOTG24KMTC

3. DRY OPERATION

3-1 INDOOR UNIT CONTROL

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 body has
detected as shown in the Table3.
( Table3 : Compressor frequency )
18KMTC X zone
22KMTC
J zone
24KMTC
Y zone
( Fig.2 : Compressor Control based on Room Temperature )
Room
temperature drops
Ts+0.5°C
Ts -1.5°C
minimum maximum
frequency frequency
10rps 130rps
10rps 130rps
10rps 130rps
Operating
frequency
24rps
18rps
0rps
Room
temperature rises
X zone
J zone
Y zone
Ts+1.5°C
Ts -0.5°C
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