Heating Operation; Dry Operation - Fujitsu ASU09RL2 Service Instructions Manual

2. HEATING 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 frequency of the compressor.
* If the room temperature is lower by
frequency will attain to maximum performance.
* If the room temperature is some degrees higher than a set temperature,
the compressor will be stopped.
* When the room temperature is between
the compressor frequency is controlled within the range shown in Table 3.
However, the maximum frequency is limited shown in Table 4 based on the fan mode.
( Table 3 : Compressor frequency range )
AOU09RL2
AOU12RL2
( Table 4 : Limit of maximum speed based on outdoor temperature )
AOU09RL2
AOU12RL2

3. DRY OPERATION

The compressor 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 Table 5.
However, after the compressor is driven, the indoor unit shall run at operation frequency of
(09 : 52 rps, 12 : 61 rps) for 60 seconds.
( Table 5 : Compressor frequency in Dry mode)
AO09RL2 X zone
J zone
Y zone
( Fig.2 : Compressor control based on room temperature )
When the room
temperature drops
X zone
Ts+0.5°C (Ts+1°F)
J zone
Ts -1.5°C (Ts-3°F)
Y zone
3°C (6°F)
+2.5°C (+5°F)
Minimum Maximum
frequency frequency
80rps
18rps
120rps
Indoor fan mode
Hi Me
80rps
120rps
Operating
frequency
30rps
AO12RL2
28rps
0rps
When the room
temperature rises
Ts+1.5°C (Ts+3°F)
Ts
than a set temperature, the compressor operation
to -3°C (-6°F) of the setting temperature,
Lo Quiet Auto
Operating
frequency
X zone 33rps
J zone
25rps
Y zone 0rps
-0.5°C (Ts-1°F)
01-02