Fan Control; Indoor Fan Control - Fujitsu ACUH09LUAS1 Service Manual

3. Fan control

Tr: Room temperature
Ts: Setting temperature

3-1. Indoor fan control

¢ Fan speed
Indoor fan speed is defined as below.
Operation mode
Heating
Cooling/Fan
Dry
*1: Fan mode only
*2: Cooling mode only
¢ Fan operation
Airflow can be switched in 5 steps such as AUTO, QUIET, 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—QUIET, indoor motor will run at a constant airflow of COOL
operation modes QUIET, LO→, MED, HIGH as shown in "Fan speed" above.
Airflow change over (Cooling: Auto)
Tr - Ts ≥ 4°F
4°F (2°C) > Tr - Ts ≥ 2°F
2°F
3-1. Indoor fan control
Fan mode
ACUH09LUAS1
HIGH
MED+
MED
LO→
QUIET
Cool air
prevention
S-LO→
HIGH
MED
LO→
QUIET
Soft quiet
400*
S-LO→
300*
↓ zone: 440
J zone: 440
HIGH mode
(2°C)
MED mode
(1°C)
LOW mode
(1°C) > Tr - Ts
When room
temperature drops
Speed (rpm)
ACUH12LUAS1
590 650
570 620
540 580
490 520
440 460
400 400
300 300
590 650
540 580
490 520
440 460
1
400*
2
300*
↓ zone: 460
J zone: 460
Tr - Ts ≥ 5°F
5°F
3°F
When room
temperature rises
- (04-10) -
ACUH18LUAS1
830
770
730
630
500
400
300
790
630
540
460
1 1
400*
2 2
300*
↓ zone: 460
J zone: 460
(2.5°C)
(2.5°C) > Tr - Ts ≥ 3°F (1.5°C)
(1.5°C) > Tr - Ts
3. Fan control