Daikin FTKS20CVMB, Service Manual

Page: 56 / 246

SiENBE04-401A Main Functions
Function and Control 47
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 113.
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 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)
(R4085) (R4085)
-1.5°C -1.5°C
-0.5°C -0.5°C
-1°C -1°C
-2°C -2°C
L
ML
M
Phase control
(R2819)
Thermostat
setting
temperature
Difference between room
and set temperature
fan speed
+1.5°C +1.5°C
+0.5°C +0.5°C
+2°C +2°C
+1°C +1°C
M
ML
L
Thermostat
setting
temperature
(R2820)
fan speed
Difference between room
and set temperature
Phase control