Fan Speed Control For Indoor Units - Daikin FLKS25BVMB Service Manual

SiBE05-513A
1.3

Fan Speed Control for Indoor Units

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 Hall IC control.
For more information about Hall IC, refer to trouble shooting for fan motor on page 85.
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 rpm.
2. Fan stops during defrost operation.
3. In time of thermostat OFF, the fan rotates at the following speed.
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
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 keeps rotating at LLL tap.
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
AC motor: Phase control
Cooling Heating
25 · 35kW class :
500 - 860 rpm
(During powerful operation :
850 - 910 rpm)
(R4085) (R4085)
L
-1˚C
ML
-2˚C
M
M
+2˚C
ML
+1˚C
L
Main Functions
Dry mode
Difference between room
and set temperature
(R4690)
Difference between room
and set temperature
(R4691)
21