Heating Operation - Fujitsu ACUH09LUAS1 Service Manual

1-2. Heating operation

A sensor (room temperature thermistor) built in indoor unit body will usually perceive difference or
variation between setting temperature and present room temperature, and controls operation fre-
quency of compressor.
• If the room temperature is 11 °F (6.0 °C) lower than a set temperature, the compressor operation
frequency will attain to maximum performance.
• If the room temperature is 2 °F (1.0 °C) higher than a set temperature, the compressor will be
stopped.
• →hen the room temperature is within the range of +2 °F (1.0°C) to -11 °F (6.0°C) of the setting
temperature, the compressor frequency is controlled within the range shown below.
• Compressor frequency range
Model name
ACUH09LUAS1
ACUH12LUAS1
ACUH18LUAS1
• Limit of maximum speed based on outdoor temperature
In heating operation, maximum frequency is defined by outdoor temperature and fan mode.
Model name
ACUH09LUAS1
ACUH12LUAS1
ACUH18LUAS1
1-2. Heating operation
Minimum frequency
Outdoor
temperature rises
57.2°F
(14°C)
14.0°F
(-10°C)
Outdoor
temperature
HIGH
zone
A zone 110
B zone 110
C zone 110
A zone 130
B zone 130
C zone 130
A zone 130
B zone 130
C zone 130
12
8
Outdoor
temperature drops
C zone
53.6°F
(12°C)
B zone
10.4°F
( -12 °C)
A zone
Indoor unit fan mode
MED
89
89
89
130
130
130
130
130
130
- (04-3) -
Unit: rps
Maximum frequency
110
130
Unit: rps
LOW QUIET
77 67
77 67
77 36
58 46
58 46
58 46
54 42
54 42
54 42
1. Compressor frequency control