Fujitsu AOUH18LPAS1, Service Manual

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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 rota-
tion number of compressor.
• If the room temperature is 11 °F (6.0 °C) lower than a set temperature, the operation rotation num-
ber of compressor 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.
• When the room temperature is within the range of +2 °F (1.0°C) to -11 °F (6.0°C) of the setting
temperature, the rotation number of compressor is controlled within the range shown below.
• Rotation number range of compressor
Unit: rps
Model name Minimum frequency Maximum frequency
ASUH18LPAS
ASUH24LPAS
8 130
• Limit of maximum speed based on outdoor temperature
In heating operation, maximum rotation number 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
ASUH18LPAS
A zone 130 111 68 50
B zone 130 111 68 50
C zone 130 111 68 50
ASUH24LPAS
A zone 130 130 102 68
B zone 130 130 102 68
C zone 130 130 102 68
1-2. Heating operation
- (04-3) -
1. Rotation number control of compressor
CONTROL AND FUNCTIONS CONTROL AND FUNCTIONS