Cooling Operation - Fujitsu ARU9RLF Service Instruction

1. COOLING OPERATION

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 4°F(2°C) higher than a set temperature, the compressor operation
frequency will attain to maximum performance.
* If the room temperature is 5°F(2.5°C) lower than a set temperature, the compressor will be
stopped.
* When the room temperature is between +4°F(+2°C) to -5°F(-2.5°C) of the setting temperature,
the compressor frequency is controlled within the range shown in Table 1.
However, the maximum frequency is limited in the range shown in Fig. 1 based on the
fan speed mode and the outdoor temperature.
( Table 1 : Compressor frequency range )
AOU9RLFC
AOU12RLFC
AOU18RLFC
When the compressor operates for 30 minutes continuously at over the maximum frequency ,
the maximum frequency is changed from Maximum Frequency
( Fig. 1 : Outdoor temperature zone )
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
Minimum Maximum
frequency frequency
10rps 74rps
74rps
10rps
104rps
12rps
Outside air
temperature
97°F
(36°C)
90°F
(32°C)
70°F
(21°C)
54°F
(12°C)
36°F
(2°C)
Maximum
frequency
57rps
57rps
68rps
to Maximum Frequency .
( Table 2 : Limit of maximum speed based on outdoor temperature )
Outdoor
temp. zone
AOU9RLFC A zone
B zone
C zone
D zone
E zone
F zone
AOU12RLFC A zone
B zone
C zone
D zone
E zone
F zone
AOU18RLFC A zone
B zone
C zone
D zone
E zone
F zone
01-01
Indoor fan mode
Hi Me Lo Quiet
74rps 49rps 44rps 35rps
74rps 49rps 44rps 35rps
74rps 49rps 44rps 35rps
49rps 40rps 31rps 22rps
49rps 40rps 31rps 22rps
49rps 40rps 31rps 22rps
74rps 49rps 44rps 35rps
74rps 49rps 44rps 35rps
74rps 49rps 44rps 35rps
49rps 40rps 31rps 22rps
49rps 40rps 31rps 22rps
49rps 40rps 31rps 22rps
104rps 59rps 48rps 30rps
104rps 59rps 48rps 30rps
72rps 48rps 41rps 30rps
48rps 41rps 34rps 21rps
48rps 41rps 34rps 21rps
48rps 41rps 34rps 21rps