Fujitsu ACUH09LUAS1, Service Manual

Page: 117 / 153

¢ Dry operation
During dry operation, fan speed setting can not be changed as shown in “Fan speed” above.
¢ 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—QUIET, the indoor motor will run at a constant airflow of
HEAT operation modes QUIET, LO→, MED, HIGH as shown in “Fan speed” above.
Airflow change over (Heating: Auto)
When the room
temperature rises
When the room
temperature drops
LOW mode
MED mode
Tr - Ts ≥ -2°F (1 °C)
-4°F (2 °C) > Tr - Ts
Tr - Ts ≥ -3°F (1.5 °C)
-3°F (1.5 °C) > Tr - Ts ≥ -5°F (2.5 °C)
-5°F (2.5 °C) > Tr - Ts
-2°F (1 °C) > Tr - Ts ≥ -4°F (2 °C)
HIGH mode
¢ Cool air prevention control (heating mode)
The maximum value of the indoor fan speed is set as shown below, based on the detected tempera-
ture by the indoor heat exchanger sensor on heating mode.
• Normal operation
98.6°F
(37°C)
89.6°F
(32°C)
75.2°F
(24°C)
93.2°F
(34°C)
86.0°F
(30°C)
98.6°F
(37°C)
102.2°F
(39°C)
107.6°F
(42°C)
Indoor heat exchanger
temperature rises
Setting fan mode*
Cool air prevention
S-LOW
Indoor heat exchanger
temperature drops
MED+
or setting fan mode*
LOW
or setting fan mode*
*: Lower speed is selected.
13 minutes later:
98.6°F
(37°C)
89.6°F
(32°C)
75.2°F
(24°C)
93.2°F
(34°C)
86.0°F
(30°C)
98.6°F
(37°C)
102.2°F
(39°C)
107.6°F
(42°C)
Indoor heat exchanger
temperature rises
Setting fan mode*
Indoor heat exchanger
temperature drops
MED+
or setting fan mode*
LOW
or setting fan mode*
*: Lower speed is selected.
LOW
or setting fan mode*
LOW
or setting fan mode*
3-1. Indoor fan control
- (04-11) -
3. Fan control
C
O
N
TR
O
L
A
N
D
FU
N
C
TI
O
N
S
C
O
N
TR
O
L
A
N
D
FU
N
C
TI
O
N
S