Fujitsu AB*G30LRTE series, Service Instruction

Page: 5 / 71

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 3°C than a set temperature, the compressor operation
frequency will attain to maximum performance.
* If the room temperature is some degrees higher than a set temperature,
the compressor will be stopped.
* When the room temperature is b2.5°C to -3°C of the setting temperature,
the compressor frequency is controlled within the range shown in Table 2.
( Table 2 : Compressor Frequency Range )
01-02
minimum
frequency
maximum
frequency
AO* G30LETL
AO* G36LETL
16rps 90rps
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 Table 3.
However, the frequency after the compressor start-up is 30rps for 60seconds.
Ts+0.5°C
Ts+1.5°C
( Table 3 : Compressor frequency )
( Fig. 2 : Compressor Control based on Room Temperature )
Operating
frequency
39rps
0rps
30LETL
36LETL
X zone
Y zone
Room
temperature drops
Room
temperature rises
X zone
Y zone