Fujitsu ASU18RLQ Service Manual

( Fig. 1 : Limit of Maximum Frequency based on Outdoor Temperature )
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 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 Table1.
However, the maximum frequency is limited in the range shown in Figure 1 based on the
fan speed mode and the outdoor temperature.
minimum
frequency
maximum
frequency
maximum
frequency
ASU15RLQ 18Hz 70Hz 90Hz
Outside air Outside air
temperature temperature
97°F(36°C)
A zone
93°F(34°C)
90°F(32°C)
B zone
86°F(30°C)
70°F(21°C)
C zone
66°F(19°C)
D zone
Hi Me Lo Quiet
( Table 1 : Compressor Frequency Range )
When the compressor operates for 30 minutes continuously at over the maximum frequency ,
the maximum frequency is changed from Maximum Frequency to Maximum Frequency .
The room temperature is controlled 2°F(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.
05-01
E zone
F zone
50°F(10°C)
32°F(0°C)
54°F(12°C)
36°F(2°C)
ASU18RLQ 18Hz 70Hz 90Hz
15/18RLQ A zone
B zone
C zone
D zone
E zone
F zone
90Hz 45Hz 42Hz 30Hz
90Hz 45Hz 42Hz 30Hz
90Hz 45Hz 42Hz 30Hz
58Hz 38Hz 34Hz 24Hz
58Hz 38Hz 34Hz 24Hz
58Hz 38Hz 34Hz 24Hz

Fujitsu ASU18RLQ Specifications

General

Brand	Fujitsu
Model	ASU18RLQ
Category	Air Conditioner
Language	English