Cooling Operation - Fujitsu AU G18LVLB Series Service Instruction

1-1. COOLING OPERATION

1-1-1 COOLING 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.
The maximum frequency is limited in the range shown in Figure 1 based on the fan speed mode
and the outdoor temperature.
* If the room temperature is 2 degC higher than a set temperature,
the compressor operation frequency will attain to maximum frequency.
* If the room temperature is 2.5 degC lower than a set temperature, the compressor will be stopped.
* When the room temperature is between +2 degC to -2.5 degC of the setting temperature,
the compressor frequency is controlled within the range shown in Table1.
( Table 1 : Compressor Frequency Range )
minimum
frequency
18rps
( Fig. 1 : Limit of Maximum Frequency based on Outdoor Temperature )
Outdoor air
temperature
34°C
30°C
19°C
10°C
0°C
When the room
temperature drops
maximum
frequency
103rps
When the room
temperature rises
A zone
36°C
B zone
32°C
C zone
21°C
D zone
12°C
E zone
2°C
F zone
Fan speed
mode
A zone 103rps
B zone
103rps
C zone
49~56rps
D-F zone
01-01
Hi Me Lo
74rps 49rps
49rps
74rps
80rps 49rps 38rps
38rps 29rps
Quiet
25rps
25rps
25rps
18rps