Compressor Frequency Control; Cooling Operation - Fujitsu ASUG09LMAS Service Manual

1. Compressor frequency control

1-1. 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 6.0 °C higher than a set temperature, the compressor operation fre-
quency will attain to maximum performance.
• If the room temperature is 1.0 °C lower than a set temperature, the compressor will be stopped.
• When the room temperature is within the range of +6.0°C to -1.0°C of the setting temperature, the
compressor frequency is controlled within the range shown in the table below. However, the maxi-
mum frequency is limited in the range shown in the figure below based on the indoor fan mode
and the outdoor temperature.
• Compressor frequency range
Model name
ASUG09LMAS
ASUG12LMAS
• Limit of maximum speed based on outdoor temperature
Model name
ASUG09LMAS
ASUG12LMAS
1-1. Cooling operation
Minimum frequency
Outdoor
temperature drops
A zone
34°C
B zone
30°C
C zone
19°C
D zone
10°C
E zone
0°C
F zone
Outdoor
temperature
HIGH
zone
A zone 67
B zone 67
C zone 67
D zone 54
E zone 54
F zone 54
A zone 89
B zone 89
C zone 89
D zone 62
E zone 62
F zone 62
- (04-1) -
12 rps
12 rps
Outdoor
temperature rises
36°C
32°C
21°C
12°C
2°C
Indoor unit fan mode
MED
47
47
47
42
42
42
54
54
54
44
44
44
Maximum frequency
67 rps
89 rps
Unit: rps
LOW QUIET
36 26
36 26
36 26
34 26
34 26
34 26
38 26
38 26
38 26
38 26
38 26
38 26
1. Compressor frequency control