Fujitsu AOU18RLB - Page 8

The maximum value of the indoor fan speed is set as shown in Fig. 6 based on the detected
temperature by the indoor heat-exchanger sensor on heating mode.
( Fig. 6 : Cool air prevension control )
5. HEATING OPERATION
Switch the airflow [Auto], and the indoor fan motor will run according to a room temperature,as shown in Fig. 5 .
On the other hand, if switched in [Hi] [Quiet], the indoor motor will run at a constant airflow
of [Heat] operation modes Quiet, Lo, Me, High, as shown in Table 5 .
6. COOL AIR PREVENTION CONTROL (Heating mode)
( Fig. 5 : Airflow change - over ( Heating : Auto ) )
108°F
(42°C)
86°F
(30°C)
93°F
(34°C)
Indoor heat exchanger
temperature rises
Indoor heat exchanger
temperature drops
Hi
Me+
Lo
Cool air
prevention
102°F
(39°C)
99°F
(37°C)
99°F
(37°C)
90°F
(32°C)
82°F
(28°C)
S-Lo
Switch the airflow [Auto] at cooling mode, and the indoor fan motor will run as shown in Fig. 7 .
7. MOISTURE RETURN PREVENTION CONTROL (Cooling mode& Dry mode)
( Fig. 7 : Indoor fan control )
Compressor
ON
OFF
Indoor fan
Setting air flow
Indoor fan
(as shown in Table 6)
S-Lo
OFF
10 30 60 180 60 180 60 10 30
(sec)
( Table 6 : Indoor fan speed )
X zone J zone
ASU18RLB
770rpm 720rpm
Y zone
0 270rpm 770rpm
ASU24RLB 900rpm 850rpm 0 270rpm 900rpm
Dry
Cooling
TR-Ts > -3°F
(-1.5°C)
=
-5°F > TR-Ts
(-2.5°C)
-3°F > TR-Ts > -5°F
(-1.5°C) (-2.5°C)
=
TR-Ts > -2°F
(-1°C)
=
-4°F > TR-Ts
(-2°C)
-2°F > TR-Ts > -4°F
(-1°C) (-2°C)
=
When the room
temperature rises
When the room
temperature drops
TR : Room te
mperature
Ts : Setting temperature
LOW mode
MED mode
MED+ mode
01-05