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

Si12-714
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, or phase
and
For more information about Hall IC, refer to the troubleshooting for fan motor on page 182.
Fan speed 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)
button is set to automatic.
Note: 1. During powerful operation, fan rotates at H tap + 50 - 90 rpm.
2. Fan stops during defrost operation.
Automatic Air 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.
Flow Control for
Heating
Automatic Air The following drawing explains the principle of fan speed control for cooling:
Flow Control for
Cooling
Function and Control
for Indoor Units
Hall IC control.
Step
= Within this range the airflow rate is automatically controlled when the FAN setting
fan speed
+1.5˚C
+0.5˚C
Thermostat
setting
temperature
DC motor: Rotation speed control
AC motor: Phase control
Cooling Heating
(R2818)
(R5229)
M
+2˚C Difference between room
ML
and set temperature
+1˚C
L
Main Functions
(R4594)
59