Daikin ARK25BVMB, Service Manual

Page: 42 / 201

SiBE04-302 Main Functions
Function and Control 33
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 95.
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 AIRFLOW
ADJUSTING button is set to AUTOMATIC
Note: 1. During powerful operation, fan operate H tap + 50 - 90 rpm.
2. Fan stops during defrost operation.
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 (Heating thermostat OFF)
25 · 35kW class :
500 - 860 rpm
(During powerful operation :
850 - 910 rpm)
LL (Cooling thermostat OFF)
SL (Silent)
L
ML
M
MH
H
HH (Powerful)
(R2818) (R2818)
-1.5˚C
-0.5˚C
-1˚C
-2˚C
L
ML
M
Thermostat
setting
temperature
Phase control
Difference between room
and set temperature
fan speed
(R2819)
+1.5˚C
+0.5˚C
+2˚C
+1˚C
M
ML
L
fan speed
Difference between room
and set temperature
Phase control
Thermostat
setting
temperature
(R2820)