Fan Speed Control For Indoor Units - Daikin FVKS25BVMB Service Manual

Main Functions
1.4

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 77.
Phase Steps Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H and HH.
LLL (Heating thermostat OFF)
LL (Cooling thermostat OFF)
SL (Silent)
L
ML
M
MH
H
HH (Powerful)
Note: 1. During powerful operation, fan operate 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
18
Step
= Within this range the airflow rate is automatically controlled when the AIRFLOW
ADJUSTING button is set to AUTOMATIC
Thermostat
setting
temperature
-0.5˚C
-1.5˚C
fan speed
fan speed
+1.5˚C
+0.5˚C
Thermostat
setting
temperature
Cooling Heating
(R2818) (R2818)
Phase control
L
-1˚C
ML
-2˚C
M
M
+2˚C
ML
+1˚C
L
Phase control
Dry mode
FVK(X)S :
740 - 760 rpm
(During powerful operation :
970 rpm)
Difference between room
and set temperature
(R2819)
Difference between room
and set temperature
(R2820)
Function and Control
Si06-305