Rotation Number Control Of Compressor; Cooling Operation; Heating Operation - Fujitsu AMUG30LMAS Service Manual

1. Rotation number control of compressor

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
rotation number of the compressor.
• If the room temperature is 7 °F (3.5 °C) higher than a set temperature, the operation rotation num-
ber of compressor will attain to maximum performance.
• If the room temperature is 1 °F (0.5 °C) lower than a set temperature, the compressor will be
stopped.
• When the room temperature is within the range of +7 °F (+3.5 °C) to -1 °F (0.5 °C) of the setting
temperature, the rotation number of compressor is controlled within the range shown in the table
below. However, the maximum rotation number is limited in the range shown in the figure below
based on the indoor fan mode and the outdoor temperature.

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 9 °F (4.5 °C) lower than a set temperature, the operation rotation num-
ber of compressor will attain to maximum performance.
• If the room temperature is 1 °F (0.5 °C) higher than a set temperature, the compressor will be
stopped.
• When the room temperature is within the range of +1 °F (+0.5 °C) to -9 °F (-4.5 °C) of the setting
temperature, the rotation number of compressor is controlled within the range shown below.
• Rotation number range of compressor
Model name
AMUG30LMAS
AMUG36LMAS
AMUG48LMAS
1-1. Cooling operation
Minimum frequency
10
15
- (04-1) -
Unit: rps
Maximum frequency
120
120
1. Rotation number control of compressor