Fan Speed Control For Indoor Units - Daikin F-Series Service Manual

Si04-703A
1.3 Fan Speed Control
Control Mode The airflow rate can be automatically controlled depending on the difference between the set
temperature and the room temperature. This is done through rotation speed control and
control.
For more information about Hall IC, refer to the troubleshooting for fan motor on page 97.
Fan Steps Fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H and HH.
In automatic operation, the step "SL" is not available.
LLL
LL
L
ML
M
MH
H
HH (POWERFUL)
Note: 1. During POWERFUL operation, fan operates H tap + 50 - 90 rpm.
2. Fan stops during defrost operation.
3. In time of thermostat OFF, the fan rotates at the following speed,
Automatic On heating mode, the indoor fan speed will be regulated according to the indoor heat exchanger
temperature and the difference between the room temperature and the required set point.
Airflow Control
for Heating
Automatic The following drawing explains the principle of fan speed control for cooling:
Airflow Control
for Cooling
Function and Control
for Indoor Units
Step
= Within this range the airflow rate is automatically controlled when the FAN setting
button is set to automatic.
Cooling : The fan keeps rotating at the set tap.
Heating : The fan stops.
fan speed
+1.5˚C
+0.5˚C
Thermostat
setting
temperature
Cooling
M
+2˚C
ML
+1˚C
L
Rotation speed control
Main Functions
Heating
(R2818)
Difference between room
and set temperature
Hall IC
(R5225)
(R5208)
31