Compressor Frequency Control; Cooling Operation - Fujitsu ASTG30KMTC 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
ASTG30KMTC
ASTG34KMTC
• Limit of maximum speed based on outdoor temperature
Model name
ASTG30KMTC
ASTG34KMTC
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 65
B zone 65
C zone 50
D zone 38
E zone 38
F zone 38
A zone 77
B zone 77
C zone 70
D zone 42
E zone 42
F zone 42
14 rps
16 rps
Outdoor
temperature rises
36°C
32°C
21°C
12°C
2°C
Indoor unit fan mode
MED
45
45
38
34
34
34
51
51
42
37
37
37
- (04-1) -
Maximum frequency
65 rps
77 rps
Unit: rps
LOW QUIET
38 27
38 27
34 27
29 20
29 20
29 20
42 29
42 29
37 29
34 23
34 23
34 23
1. Compressor frequency control