Cooling Operation - Fujitsu S24LDC Service Instruction

1. COOLING OPERATION

1-1 COOLING 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 2 C higher than a set temperature, the compressor operation
frequency will attain to maximum performance.
* If the room temperature is 2.5 C lower than a set temperature, the compressor will be
stopped.
* When the room temperature is between +2 C to -2.5 C of the setting temperature,
the compressor frequency is controlled within the range shown in Table1.
However, the maximum frequency is limited in the range shown in Figure 1 based on the
fan speed mode and the outdoor temperature.
( Table 1 : Compressor Frequency Range )
AS*B24LDC
( Fig. 1 : Limit of Maximum Frequency based on Outdoor Temperature )
Outside air
temperature
A zone
34 C
B zone
30 C
C zone
19 C
D zone
10 C
E zone
0 C
F zone
When the compressor operates for 30 minutes continuously at over the maximum frequency ,
the maximum frequency is changed from Maximum Frequency
The room temperature is controlled 1 C lower than the setting temperature for 40 minutes
after starting the operation.
After 40 minutes, it is controlled based on the normal setting temperature.
minimum maximum
frequency frequency
15Hz 115Hz
Outside air
temperature
36 C
32 C
21 C
12 C
2 C
maximum
frequency
80Hz
24LDC A zone 115Hz
B zone 115Hz
C zone 115Hz
D zone 58Hz
E zone 58Hz
F zone 58Hz
to Maximum Frequency .
05-01
Hi Me Lo
66Hz 54Hz
66Hz 54Hz
66Hz 54Hz
45Hz 38Hz
45Hz 38Hz
45Hz 38Hz
Quiet
34Hz
34Hz
34Hz
24Hz
24Hz
24Hz