Fujitsu ASU18RMLQ Service Instruction page 8

(4). DRY OPERATION
During the dry mode operation, the fan speed setting can not be changed.
The indication of the remote controller is fixed in [AUTO].
The fan operates on [S-Lo] mode or OFF.
(5). HEATING OPERATION
5-1. For AU / AS Type
Switch the airflow [AUTO], and the
indoor fan motor will run according
to a room temperature, as shown in
Figure 3.
On the other hand, if switched
[HIGH] [QUIET], the indoor motor
will run at a constant airflow of [HEAT]
operation modes QUIET, LOW, MED,
HIGH, as shown in Table 2.
5-2. For AR Type
When the airflow is set to [AUTO], the indoor fan
motor operates [MED] mode.
Then the indoor fan motor will run according
to a room temperature, as shown in Figure 4.
On the other hand, if switched in [HIGH]
the indoor motor will run at a constant airflow
of [HEAT] operation modes QUIET, LOW, MED, HIGH,
as shown in Table 2.
(6). COOL AIR PREVENTION CONTROL (Heating mode)
6-1. For AS Type
The maximum value of the indoor fan speed is set as shown in Figure 5, based on the detected
temperature by the indoor heat exchanger sensor on heating mode.
(Fig.5 : Cool Air Prevention Control)
Indoor heat exchanger
temperature
117°F (47°C)
104°F (40°C)
99°F (37°C)
86°F (30°C)
(Fig.3)
airflow change - over ( Heating: AUTO)
When the room
temperature rises
-2°F (-1°C)
-4°F (-2°C)
(Room temperature) - (Setting temperature)
( Fig.4 : Airflow change - over ( Heating : AUTO ) )
[QUIET],
Hi
Me+
Lo
Cool air prevention
S-Lo
01-05
LOW mode
MED mode
MED + mode
When the room
temperature lowers
Indoor heat exchanger
temperature
Go up one-step
117°F (47°C)
Hold
105.8°F (41°C)
Go down one-step
Indoor heat exchanger
temperature
104°F (40°C)
93°F (34°C)
90°F (32°C)
82°F (28°C)
-3°F (-1.5°C)
-5°F (-2.5°C)