Heating Operation - Fujitsu S24LDC 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 3 C than a set temperature, the compressor operation
frequency will attain to maximum performance.
* If the room temperature is higher 2.5 C than a set temperatire, the compressor will be
stopped.
* When the room temperature is between +2 C to -3 C of the setting temperature,
the compressor frequency is controlled within the range shown in Table2.
However, the maximum frequency is limited in the range shown in Figure 2 based on the
fan speed mode and the outdoor temperature.
( Table 2 : Compressor Frequency Range )
AS*B24LDC
( Fig.2 : Limit of Maximum Frequency based on Outdoor Temperature )
Outside air
temperature
19 C
14 C
* The room temperature is controlled 2 C higher than the setting temperature for 60 minutes
after starting the operation.
After 60 minutes, it is controlled based on the normal setting temperature.
minimum maximum
frequency frequency
15Hz 130Hz
Outside air
temperature
C zone
17 C
B zone
12 C
A zone
24LDC A zone 130Hz
B zone 130Hz
C zone 130Hz
05-02
Hi Me+ Me
130Hz 101Hz
130Hz 101Hz
130Hz 101Hz
Lo Quiet
75Hz 62Hz
75Hz 62Hz
57Hz 62Hz