Fan Control; Indoor Fan Control - Fujitsu ARXG45KHTA Service Manual

3. Fan control

Tr: Room temperature
Ts: Setting temperature

3-1. Indoor fan control

¢ Fan operation
Airflow can be switched in 4 steps such as AUTO, LO→, MED, HIGH while indoor unit fan only runs.
→hen fan mode is set at AUTO, it operates on MED fan speed.
¢ Cooling operation
Switch the airflow AUTO, and indoor fan motor will run according to room temperature, as below.
On the other hand, if switched in HIGH—LO→, indoor motor will run at a constant airflow of COOL
operation modes LO→, MED, HIGH.
Airflow change over (Cooling: Auto)
2°C
¢ Dry operation
During dry operation, fan speed setting can not be changed.
¢ Heating operation
Switch the airflow AUTO, and the indoor fan motor will run according to a room temperature, as be-
low.
On the other hand, if switched in HIGH—LO→, the indoor motor will run at a constant airflow of
HEAT operation modes LO→, MED, HIGH.
Airflow change over (Heating: Auto)
-1°C > Tr - Ts ≥
3-1. Indoor fan control
Tr - Ts ≥ 2°C
> Tr - Ts ≥ 1°C
1°C > Tr - Ts
When room
temperature drops
When the room
temperature rises
Tr - Ts ≥ -1°C
LOW mode
-2°C
MED mode
-2°C > Tr - Ts
HIGH mode
Tr - Ts ≥
HIGH mode
2.5°C
MED mode
1.5°C > Tr - Ts
LOW mode
When room
temperature rises
When the room
temperature drops
Tr - Ts ≥
-1.5°C
-2.5°C > Tr - Ts
- (04-8) -
2.5°C
> Tr - Ts ≥ 1.5°C
-1.5°C
> Tr - Ts ≥ -2.5°C
3. Fan control