Heating Operation - Fujitsu ASUG12LZAS 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 6.0 °C lower than a set temperature, the compressor operation frequen-
cy will attain to maximum performance.
• If the room temperature is 1.0 °C higher than a set temperature, the compressor will be stopped.
• When the room temperature is within the range of +1.0°C to -6.0°C of the setting temperature, the
compressor frequency is controlled within the range shown below.
• Compressor frequency range
Model name
ASUG09LZAS
ASUG12LZAS
ASUG15LZAS
• Limit of maximum speed based on outdoor temperature
In heating operation, maximum frequency is defined by outdoor temperature and fan mode.
Model name
ASUG09LZAS
ASUG12LZAS
ASUG15LZAS
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 130
B zone 130
C zone 130
A zone 130
B zone 130
C zone 130
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
130
130
130
130
130
130
- (04-3) -
Unit: rps
Maximum frequency
130
Unit: rps
LOW QUIET
58 46
58 46
58 46
54 42
54 42
54 42
1. Compressor frequency control