Fujitsu ASU7RLF1 Service Instructions Manual page 11

5. HEATING OPERATION (Auto : Heating)
Switch the airflow [Auto], and the indoor fan will run according to a room temperature,
as shown in Fig. 4 .
On the other hand, if switched in [Hi]
of [Heat] operation modes Quiet, Lo, Me, Hi, as shown in Table 2 .
( Fig. 4 : Airflow change - over )
TR-Ts > -2
°F
-2 > TR-Ts > -4
=
(
-1°C)
°F
-4 > TR-Ts
(
-2°C)
TR-Ts > -2
°F
-2 > TR-Ts > -4
=
(
-1°C)
°F
-4 > TR-Ts
(
-2°C)
6. COOL AIR PREVENTION CONTROL (For Heating and Minimum Heat operation)
The maximum value of the indoor fan speed is set as shown in Fig. 5 , based on the detected
temperature by the indoor heat exchanger sensor in heating mode.
Field setting is necessary at AU and AR type as "Cool air prevention : effective"
( Fig. 5 : 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)
Cool air
prevention
°
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
Lo
=
(
-1°C)
°F
(
Me
-2°C)
Me+
< AGU/ AUU/ ARU type >
When the room
temperature rises
°F
Lo
=
(
-1°C)
°F
(
-2°C)
Me
Hi
When Indoor heat exchanger
temperature drops
Hi
°
98.6 F
(37°C)
FAN mode
°
93.2 F
(34°C)
FAN mode
°
89.6 F
(32°C)
°
82.4 F
S-Lo
(28°C)
When the room
temperature drops
TR-Ts > -3
=
(
-1.5°C)
°F
-3 > TR-Ts > -5
(
-1.5°C)
°F
-5 > TR-Ts
(
-2.5°C)
When the room
temperature drops
TR-Ts > -3
=
(
-1.5°C)
°F
-3 > TR-Ts > -5
(
-1.5°C)
°F
-5 > TR-Ts
(
-2.5°C)
When Indoor heat exchanger
temperature rises
107.6°F
(42°C)
*
Me or setting
102.2°F
(39°C)
*
98.6°F
(37°C)
86.0°F
(30°C)
*
Lower speed is selected
01-08
°F
°F
=
(
-2.5°C)
°F
°F
=
(
-2.5°C)
TR : Room temperature
Ts : Setting temperature
< AGU type >
When Indoor heat exchanger
temperature drops
Hi
93.2°F
(34°C)
FAN mode
87.8°F
Lo or setting
(31°C)
FAN mode
84.2°F
Cool air
prevention (29°C)
75.2°F
S-Lo
(24°C)