Fan Control; Indoor Fan Control - Fujitsu AUUH18LUAS 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
Fan mode
mode
HIGH
MED+
MED
LO→
Heating
QUIET
Cool air
prevention
S-LO→
HIGH
MED
LO→
Cooling/Fan
QUIET
Soft quiet
S-LO→
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
AUUH18LUAS
390
380
360
340
300
300
270
390
360
340
300
1
270*
2
270*
↓ zone: 300
J zone: 300
HIGH mode
(2°C)
MED mode
(1°C)
LOW mode
(1°C) > Tr - Ts
When room
temperature drops
Speed (rpm)
AUUH24LUAS AUUH30LUAS
430
410
390
370
330
300
270
430
390
370
330
1
300*
2
270*
↓ zone: 330
J zone: 330
Tr - Ts ≥ 5°F
5°F
3°F
When room
temperature rises
- (04-13) -
AUUH36LUAS
560 660
530 600
510 560
470 510
420 430
300 300
270 270
560 660
510 560
470 510
420 430
1
300* 300*
2
270* 270*
↓ zone: 420 ↓ zone: 430
J zone: 420 J zone: 430
(2.5°C)
(2.5°C) > Tr - Ts ≥ 3°F (1.5°C)
(1.5°C) > Tr - Ts
1
2
3. Fan control