Cooling Operation - Fujitsu ASU9RL 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
frequency will attain to maximum performance.
* If the room temperature is
stopped.
* When the room temperature is between
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 )
ASU9RL
ASU12RL
( Fig. 1 : Limit of Maximum Frequency based on Outdoor Temperature )
Outside air
temperature
A zone
93°F
(34°C)
B zone
86°F
(30°C)
C zone
66°F
(19°C)
D zone
50°F
(10°C)
E zone
32°F
(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
4°F(2°C) higher than a set temperature, the compressor operation
5°F(2.5°C) lower than a set temperature, the compressor will be
+4°F(+2°C)
minimum maximum
frequency frequency
22Hz 76Hz
18Hz 80Hz
Outside air
temperature
97°F
9RL
(36°C)
90°F
(32°C)
70°F
(21°C)
12RL
54°F
(12°C)
36°F
(2°C)
05-01
to -5°F(-2.5°C) of the setting temperature,
maximum
frequency
79Hz
96Hz
Hi Me
A zone 79Hz 61Hz
B zone 79Hz 61Hz
C zone 79Hz 61Hz
D zone 52Hz 43Hz
E zone 64Hz 55Hz
F zone 64Hz 55Hz
A zone 96Hz 61Hz
B zone 96Hz 61Hz
C zone 96Hz 61Hz
D zone 57Hz 42Hz
E zone 57Hz 42Hz
F zone 57Hz 42Hz
to Maximum Frequency .
Lo Quiet
52Hz 37Hz
52Hz 37Hz
52Hz 37Hz
37Hz 28Hz
49Hz 36Hz
49Hz 36Hz
51Hz 33Hz
51Hz 33Hz
51Hz 33Hz
36Hz 27Hz
36Hz 27Hz
36Hz 27Hz