Daikin FTKS20CVMB(9) - Fan Speed Control for Indoor Units

SiENBE04-512A Main Functions
Function and Control 39
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 105.
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
fan speed
(R2819)
Thermostat
setting
temperature
Difference between room
and set temperature
+1.5°C
+1.5°C
+0.5°C
+0.5°C
+2°C
+2°C
+1°C
+1°C
M
ML
L
f
an speed
Phase control
(R2820)
Thermostat
setting
temperature
Difference between room
and set temperature
SiENBE04-512A.book Page 39 Friday, October 5, 2007 1:49 PM