Fujitsu AGU12RLF Service Instruction page 8

5. HEATING OPERATION
Switch the airflow [Auto], and the indoor fan motor will run according to a room temperature,
as shown in Fig. 5
On the other hand, if switched in [Hi]
of [Heat] operation modes Quiet, Lo, Me, High, as shown in Table 5.
( Fig. 5 : Airflow change - over ( Heating : Auto ) )
TR-Ts > -2°F
=
(-1°C)
-2°F > TR-Ts > -4°F
=
(-1°C) (-2°C)
-4°F > TR-Ts
(-2°C)
6. COOL AIR PREVENTION CONTROL (Heating mode)
The maximum value of the indoor fan speed is set as shown in Fig. 6 based on the detected
temperature by the indoor heat-exchanger sensor on heating mode.
( Fig. 6 : Cool air prevension control )
<Normal operation>
Indoor heat exchanger
temperature rises
108°F
(42°C)
102°F
(39°C)
99°F
(37°C)
Cool air
prevention
86°F
(30°C)
7. MOISTURE RETURN PREVENTION CONTROL (Cooling mode& Dry mode)
Switch the airflow [Auto] at cooling mode, and the indoor fan motor will run as shown in Fig. 7.
( Fig. 7 : Indoor fan control )
Compressor
ON
OFF
Indoor fan
Setting air flow
Indoor fan
(as shown in Table 6)
S-Lo
OFF
( Table 6 : Indoor fan speed )
AGU9 /12RLF /15RLF
[Quiet], the indoor motor will run at a constant airflow
When the room
temperature rises
Lo mode
Me mode
Hi mode
Indoor heat exchanger
temperature drops
Hi
Me
Lo
S-Lo
10 30 60
Dry
X zone J zone
680rpm 680rpm
When the room
temperature drops
TR-Ts > -3°F
=
(-1.5°C)
-3°F > TR-Ts > -5°F
(-1.5°C)
-5°F > TR-Ts
(-2.5°C)
Indoor heat exchanger
temperature rises
108°F
(42°C)
93°F
(34°C) 102°F
(39°C)
88°F
99°F
(31°C)
(37°C)
84°F
(29°C) 86°F
(30°C)
75°F
(24°C)
180 60
Cooling
680rpm
01-05
=
(-2.5°C)
TR : Room temperature
Ts : Setting temperature
<Powerful operation>
Indoor heat exchanger
temperature drops
Powerful
Hi
Lo
Cool air
prevention
S-Lo
180 60 10
93°F
(34°C)
88°F
(31°C)
84°F
(29°C)
75°F
(24°C)
30
(sec)