Cooling Operation - Fujitsu ASU18RLB Service Instructions Manual

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 7°F(3.5°C) higher than a set temperature, the compressor operation
frequency will attain to maximum performance.
* If the room temperature is 1°F(0.5°C) lower than a set temperature, the compressor will be
stopped.
* When the room temperature is between +7°F(+3.5°C) to -1°F(-0.5°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 )
AOU18RLB
AOU24RLB
When the compressor operates for 30 minutes continuously at over the maximum frequency
the maximum frequency is changed from the maximum frequency
( Fig. 1 : Outdoor temperature zone )
When the outdoor
temperature drops
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
12rps 104rps
104rps
12rps
When the outdoor
temperature rises
97°F
(36°C)
90°F
(32°C)
70°F
(21°C)
54°F
(12°C)
36°F
(2°C)
Maximum
frequency
63rps
72rps
to the maximum frequency
Ⅰ
( Table 2 : Limit of maximum speed based on outdoor temperature )
Outdoor
temp. zone
A zone
AOU18RLB
AOU24RLB B zone
C zone
D zone
E zone
F zone
01-01
,
Ⅱ
.
Ⅱ
Indoor fan mode
Hi Me Lo
59rps 48rps 38rps
104rps
104rps 59rps 48rps 38rps
86rps 59rps 48rps 38rps
63rps 56rps 41rps 34rps
63rps 56rps 41rps 34rps
63rps 56rps 41rps 34rps
Quiet