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

SiBE12-519
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 phase control and
For more information about Hall IC, refer to the troubleshooting for fan motor on page 138.
Phase Steps Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H and HH.
LLL
LL
SL (Silent)
L
ML
M
MH
H
HH (Powerful)
Note: 1. During powerful operation, fan rotates at H tap + 50 - 90 rpm.
2. Fan stops during defrost operation.
Automatic Air The following drawing explains the principle for fan speed control for heating:
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
Step
= Within this range the airflow rate is automatically controlled when the FAN setting
button is set to automatic.
DC motor: Rotation speed control
Thermostat
AC motor: Phase control
setting
temperature
-0.5˚C
-1.5˚C
fan speed
fan speed
+1.5˚C
+0.5˚C
Thermostat
setting
temperature
DC motor: Rotation speed control
AC motor: Phase control
Cooling Heating
20 · 25 · 35kW class :
670 - 880 rpm
(During powerful operation :
720 - 930 rpm)
(R2818) (R2818)
L
-1˚C
ML
-2˚C
M
M
+2˚C
ML
+1˚C
L
Main Functions
Hall IC control.
Dry mode
Difference between room
and set temperature
(R4593)
Difference between room
and set temperature
(R4594)
37