Heating Operation; Dry Operation - Fujitsu AU G18LVLB Series Service Instruction

1-2. HEATING OPERATION

1-2-1 HEATING CAPACITY CONTROL
A sensor (room temperature thermistor) built in the indoor unit 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 3 degC than a set temperature,
the compressor operation frequency will attain to maximum frequency.
* If the room temperature is higher 2.5 degC than a set temperature, the compressor
will be stopped.
* When the room temperature is between +2.5 degC to -3 degC of the setting temperature,
the compressor frequency is controlled within the range shown in Table2.
( Table 2 : Compressor Frequency Range )
minimum
frequency
8rps

1-3. DRY OPERATION

1-3-1 INDOOR UNIT CONTROL
The compressor rotation frequency shall change according to set temperature and room
temperature variation which the room temperature sensor of the indoor unit has detected
as shown in the Fig 2.
( Table 3 : Compressor frequency )
Operating
frequency
25 rps
( Fig.2 : Compressor Control based on Room Temperature )
Room
temperature
Ts-1.5 degC
maximum
frequency
120rps
Room
temperature
Compressor ON
Compressor OFF
Ts-0.5 degC
Ts : Setting temperature
01-02