Fujitsu AU*24LUAR Service Instruction page 31

3. COOLING OPERATION
Switch the airflow [AUTO], and the indoor fan motor will run according to a room temperature,
as shown in Figure 5.
On the other hand, if switched in [HIGH]
operation modes LOW, MED, HIGH,as shown in Table 5.
( Fig.5 : Airflow change - over ( Cooling : AUTO ) )
TR-Ts > 2 degC
=
2 degC > TR-Ts > 1 degC
=
1 degC > TR-Ts
4. HEATING OPERATION
When the airflow is set to [AUTO], the indoor fan
motor operates [MED] mode.
Then the indoor fan motor will run according
to a room temperature, as shown in Figure 6.
On the other hand, if switched in [HIGH]
the indoor motor will run at a constant airflow
of [COOL] operation modes LOW, MED, HIGH,
as shown in Table 5.
5. COOL AIR PREVENTION CONTROL (Heating mode)
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.
( Fig.7 : Cool Air Prevention Control )
Indoor heat exchanger
temperature
33°C
30°C
6. DRY OPERATION
Refer to the Figure 4.
During the dry mode operation, the fan speed setting can not be changed.
[LOW], the indoor motor will run at a constant airflow of [COOL]
*1
HIGH mode
MED mode
LOW mode
When the room
temperature drops
[LOW],
Indoor heat exchanger
temperature
SETTING
FAN MODE
LO mode
S-LOW mode
When the room
temperature rises
TR-Ts > 3 degC
=
3 degC > TR-Ts > 2 degC
2 degC > TR-Ts
*1 : Contains a condition to the following
When the operation mode is set to AUTO mode
at the start of operation.
When the setting temperature was changed.
When the operation mode was changed to COOLING mode.
When the airflow mode was changed to AUTO mode.
( Fig.6 : Airflow change - over ( Heating : AUTO ) )
Indoor heat exchanger
temperature
30°C
05-06
TR : Room temperature
Ts : Setting temperature
=
Go up one-step
47°C
Hold
41°C
Go down one-step