Compressor Frequency Control; Cooling Operation - Fujitsu ABHG54KRTA 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
ABHG54KRTA
• Limit of maximum speed based on outdoor temperature
Model name
ABHG54KRTA
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 95
B zone 95
C zone 80
D zone 56
E zone 56
F zone 56
17 rps
Outdoor
temperature rises
36°C
32°C
21°C
12°C
2°C
Indoor unit fan mode
MED
66
66
51
41
41
41
- (04-1) -
Maximum frequency
95 rps
Unit: rps
LOW QUIET
51 33
51 33
41 33
35 27
35 27
35 27
1. Compressor frequency control