Fujitsu AB A30LBT Series Service Instruction page 11

4. HEATING OPERATION
Switch the airflow [AUTO], and the indoor fan motor will run according to a room temperature,
as shown in Figure 7.
On the other hand, if switched in [HIGH]
of [HEAT] operation modes QU, LOW, MED, HIGH, as shown in Table 5.
( Fig.7 : Airflow change - over ( Heating : AUTO ) )
When the room
temperature rises
TR-Ts > - 1 °C
=
- 1 °C > TR-Ts > - 2 °C
=
- 2 °C > TR-Ts
5. COOL AIR PREVENTION CONTROL (Heating mode)
When the compressor operates, the maximum value of the indoor fan speed is set as shown in Figure 8,
based on the detected temperature by the indoor heat exchanger sensor on heating mode.
When the compressor does not operate, the indoor fan motor operates [S-Lo] mode.
( Fig.8 : Cool Air Prevention Control )
5-1. For AB / AU Type
< [Hi] setting >
Indoor heat exchanger
temperature
42°C
39°C
37°C
prevention
30°C
5-2. For AR Type
(1) Fan mode : HIGH
Indoor heat exchanger
temperature
HIGH mode
37°C
LOW mode
30°C
S-LOW mode
6. DRY OPERATION
Refer to the Figure 4.
During the dry mode operation, the fan speed setting can not be changed.
[QU], the indoor motor will run at a constant airflow
LOW mode
MED mode
HIGH mode
Indoor heat exchanger
temperature
Hi
37°C
Me+
34°C
Lo
32°C
Cool air
24°C
S-Lo
Indoor heat exchanger
temperature
When the room
temperature drops
TR-Ts > - 1.5 °C
=
- 1.5 °C > TR-Ts > - 2.5 °C
- 2.5 °C > TR-Ts
< The other of [Hi] setting >
Indoor heat exchanger
temperature
39°C
37°C
30°C
(2) Fan mode : MED, LOW, QUIET
Indoor heat exchanger
temperature
37°C
32°C
30°C
24°C
01-06
TR : Room temperature
Ts : Setting temperature
=
Indoor heat exchanger
temperature
Setting
FAN mode
Lo (Qu)
Cool air
prevention
S-Lo
Indoor heat exchanger
temperature
SETTING
FAN MODE
LOW mode
S-LOW mode
34°C
32°C
24°C
32°C
24°C