Fujitsu ACUH09LUAS1, Service Manual

Page: 109 / 153

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
Unit: rps
Model name Minimum frequency Maximum frequency
ACUH09LUAS1 12 110
ACUH12LUAS1
ACUH18LUAS1
8 130
• Limit of maximum speed based on outdoor temperature
In heating operation, maximum frequency is defined by outdoor temperature and fan mode.
A zone
B zone
57.2°F
(14°C)
C zone
14.0°F
(-10°C)
Outdoor
temperature rises
Outdoor
temperature drops
53.6°F
(12°C)
10.4°F
(
-12
°C)
Unit: rps
Model name
Outdoor
temperature
zone
Indoor unit fan mode
HIGH MED LOW QUIET
ACUH09LUAS1
A zone 110 89 77 67
B zone 110 89 77 67
C zone 110 89 77 36
ACUH12LUAS1
A zone 130 130 58 46
B zone 130 130 58 46
C zone 130 130 58 46
ACUH18LUAS1
A zone 130 130 54 42
B zone 130 130 54 42
C zone 130 130 54 42
1-2. Heating operation
- (04-3) -
1. Compressor frequency control
C
O
N
TR
O
L
A
N
D
FU
N
C
TI
O
N
S
C
O
N
TR
O
L
A
N
D
FU
N
C
TI
O
N
S