Fujitsu ASYA07LBCM Service Manual page 6

4. HEATING OPERATION
Switch the airflow [AUTO], and the indoor fan motor will run according to a room temperature,
as shown in Figure 3.
On the other hand, if switched in [HIGH]
of [HEAT] operation modes QUIET, LOW, MED, HIGH, as shown in Table 2.
( Fig.3 : Airflow change - over ( Heating : AUTO ) )
TR-Ts > - 1 degC
=
- 1 degC > TR-Ts > - 2 degC
=
- 2 degC > TR-Ts
5. COOL AIR PREVENTION CONTROL (Heating mode)
When the compressor operates, the maximum value of the indoor fan speed is set as shown in Figure 7,
based on the detected temperature by the indoor heat exchanger sensor on heating mode.
When the compressor does not operate, the indoor fan motor operates [S-Lo] mode.
( Fig.7 : Cool Air Prevention Control )
< [Hi] setting >
Indoor heat exchanger
temperature
47°C
40°C
37°C
30°C
[QUIET], the indoor motor will run at a constant airflow
When the room
temperature rises
Lo mode
Me mode
Me+ mode
Indoor heat exchanger
temperature
Hi
Me
Lo
Cool air
prevention
S-Lo
[ ASYA7, 9, 12LBCM: Cool air prevention 600rpm, S-Lo 480rpm ]
When the room
temperature drops
TR-Ts > - 1.5 degC
=
- 1.5 degC > TR-Ts > - 2.5 degC
- 2.5 degC > TR-Ts
< The other of [Hi] setting >
Indoor heat exchanger
temperature
40°C
40°C
37°C
34°C
30°C
32°C
28°C
01-03
TR : Room temperature
Ts : Setting temperature
=
Indoor heat exchanger
Setting
temperature
FAN mode
Lo (Qu)
Cool air
prevention
S-Lo
34°C
32°C
28°C