( 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.
minimum
frequency
maximum
frequency
ASU18RLF
12rps
55rps
ASU24RLF
16rps
72rps
Outside air Outside air
temperature temperature
96.8°F
(36°C)
A zone
93.2°F
(34°C)
89.6°F
(32°C)
B zone
86°F
(30°C)
69.8°F
(21°C)
C zone
66.2°F
(19°C)
D zone
Hi
Me
Lo
Quiet
A zone
55rps
36rps
29rps
25rps
B zone
55rps
36rps
29rps
25rps
C zone
47rps
36rps
29rps
25rps
18RLF
D zone
37rps
33rps
26rps
20rps
E zone
37rps
33rps
26rps
20rps
F zone
37rps
33rps
26rps
20rps
72rps
49rps
41rps
29rps
72rps
49rps
41rps
29rps
55rps
41rps
36rps
29rps
43rps
36rps
31rps
20rps
43rps
36rps
31rps
20rps
41rps
36rps
31rps
20rps
A zone
B zone
C zone
24RLF
D zone
E zone
F zone
( Table1 : Compressor Frequency Range )
01-01
E zone
F zone
50°F
(10°C)
32°F
(0°C)
53.6°F
(12°C)
35.6°F
(2°C)
* When the room temperature is b4°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 Figure1 based on the
fan speed mode and the outdoor temperature.
* If the room temperature is 5°F(2.5°C) lower than a set temperature, the compressor will be
stopped.