Fujitsu ARU7RLF Service Instruction page 13

5. HEATING OPERATION
Switch the airflow [Auto], and the indoor fan 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, Hi, as shown in Table 2.
( Fig.5 : Airflow change - over ( Heating : Auto ) )
TR-Ts > -2
=
°F(
-2 -1°C) > TR-Ts > -4
=
°F(
-4 -2°C) > TR-Ts
TR-Ts > -2
=
°F(
-2 -1°C) > TR-Ts > -4
=
°F(
-4 -2°C) > TR-Ts
6. COOL AIR PREVENTION CONTROL (For Heating and Min. Heat operation)
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 in heating mode.
Field setting is necessary at AR and AU type as "Cool air prevention : effective"
( Fig.6 : Airflow change - over for cool air prevention)
During NORMAL HEATING OPERATION
< ASU type >
When Indoor heat exchanger
temperature rises
107.6°F(42°C)
*
Me+ or setting
°
102.2 F
(39°C)
*
Lo or setting
°
98.6 F
(37°C)
°
86 F
(30°C)
*
Lower speed is selected
[Quiet], the indoor fan will run at a constant airflow
< ASU type >
When the room
temperature rises
°F(
-1°C)
°F(
-2°C)
< AUU/ ARU/ AGU type >
When the room
temperature rises
°F(
-1°C)
°F(
-2°C)
When Indoor heat exchanger
temperature drops
Hi
°
98.6
(37°C)
FAN mode
°
93.2
(34°C)
FAN mode
°
89.6
Cool air
prevention
(32°C)
°
82.4
S-Lo
(28°C)
When the room
temperature drops
Lo
TR-Ts > -3
Me
°F(
-3 -1.5°C) > TR-Ts > -5
°F(
-5 -2.5°C) > TR-Ts
Me+
When the room
temperature drops
Lo
TR-Ts > -3
Me
°F(
-3 -1.5°C) > TR-Ts > -5
°F(
-5 -2.5°C) > TR-Ts
Hi
When Indoor heat exchanger
temperature rises
°
98.6 F
(37°C)
F
°
84.2 F
(29°C)
F
*
Lower speed is selected
F
F
01-09
TR : Room temperature
Ts : Setting temperature
°F(
-1.5°C)
=
°F(
-2.5°C)
=
°F(
-1.5°C)
=
°F(
-2.5°C)
=
< ARU type >
When Indoor heat exchanger
temperature drops
*
Hi or setting
FAN mode
*
Lo or setting
FAN mode
S-Lo
°
89.6 F
(32°C)
°
75.2 F
(24°C)