Daikin Inverter FLKS25BVMB, Service Manual

Page: 30 / 184

SiBE05-513A Main Functions
Function and Control 21
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.
= Within this range the airflow rate is automatically controlled when the FAN setting
button is set to automatic.
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.
Cooling: The fan keeps rotating at the set tap.
Heating: The fan keeps rotating at LLL tap.
Automatic Air
Flow Control for
Heating
The following drawing explains the principle for fan speed control for heating:
Automatic Air
Flow Control for
Cooling The following drawing explains the principle of fan speed control for cooling:
Step Cooling Heating Dry mode
LLL
25 · 35kW class :
500 - 860 rpm
(During powerful operation :
850 - 910 rpm)
LL
SL (Silent)
L
ML
M
MH
H
HH (Powerful)
(R4085) (R4085)
-1.5˚C
-0.5˚C
-1˚C
-2˚C
L
ML
M
Thermostat
setting
temperature
AC motor: Phase control
Difference between room
and set temperature
fan speed
(R4690)
+1.5˚C
+0.5˚C
+2˚C
+1˚C
M
ML
L
fan speed
Difference between room
and set temperature
AC motor: Phase control
Thermostat
setting
temperature
(R4691)