Heating Operation; Dry Operation - Fujitsu ASU 9RLF Service Instructions Manual

2. HEATING OPERATION

2-1 HEATING CAPACITY CONTROL
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 frequency of the compressor.
* If the room temperature is lower by 6°F(3°C) than a set temperature, the compressor operation
frequency will attain to maximum performance.
* If the room temperature is higher 5°F(2.5°C) than a set temperatire, the compressor will be
stopped.
* When the room temperature is between +5°F(+2.5°C) to -6°F(-3°C) of the setting temperature,
the compressor frequency is controlled within the range shown in Table2.
( Table2 : Compressor Frequency Range )
ASU9RLF
ASU12RLF
ASU15RLS

3. DRY OPERATION

3-1 INDOOR UNIT CONTROL
The compressor rotation frequency shall change according to the temperature, set temperature,
and room temperature variation which the room temperature sensor of the indoor unit body has
detected as shown in the Table3.
However, after the compressor is driven, the indoor unit shall run at operation frequency of
64rps (9RLF), 61rps (12RLF), 51rps (15RLS), for a minute.
( Table3 : Compressor frequency )
9RLF X zone
J zone
Y zone
( Fig.2 : Compressor Control based on Room Temperature )
Room
temperature
X zone
Ts+1°F
(Ts+0.5°C)
J zone
Ts-3°F
(Ts-1.5°C)
Y zone
minimum maximum
frequency frequency
22rps 99rps
18rps 130rps
15rps 119rps
Operating
frequency
37rps
12RLF X zone
28rps J zone
0rps Y zone
Room
temperature
Ts+3°F
(Ts+1.5°C)
Ts-1°F
(Ts-0.5°C)
01-02
Operating
frequency
33rps 15RLS X zone
J zone
25rps
0rps Y zone
Operating
frequency
29rps
18rps
0rps