Fan Speed Control For Indoor Units - Daikin FTKS20DVMW(L) Service Manual

SiENBE04-507A
1.3

Fan Speed Control for Indoor Units

The airflow rate can be automatically controlled depending on the difference between the set
Control Mode
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 115.
Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H and HH.
Phase Steps
LLL
LL
SL (Silent)
L
ML
M
MH
H
HH (Powerful)
1. During powerful operation, fan rotates at H tap + 50 rpm.
Note:
2. Fan stops during defrost operation.
3. In time of thermostat OFF, the fan rotates at the following speed.
The following drawing explains the principle for fan speed control for heating:
Automatic Air
Flow Control for
Heating
The following drawing explains the principle of fan speed control for cooling:
Automatic Air
Flow Control for
Cooling
Function and Control
Step
= Within this range the airflow rate is automatically controlled when the FAN setting
button is set to automatic.
Cooling: The fan keeps rotating at the set tap.
Heating: The fan stops.
Thermostat
DC motor: Rotation speed control
setting
temperature
-0.5°C -0.5°C
-1.5°C -1.5°C
fan speed
fan speed
+1.5°C +1.5°C
+0.5°C +0.5°C
Thermostat
setting
temperature
DC motor: Rotation speed control
Cooling Heating
20 · 25 · 35kW class :
670 - 880 rpm
(During powerful operation :
720 - 930 rpm)
(R4085) (R4085)
L
-1°C -1°C
ML
-2°C -2°C
M
M
+2°C +2°C
ML
+1°C +1°C
L
Main Functions
Dry mode
Difference between room
and set temperature
(R4558)
Difference between room
and set temperature
(R4559) (R4558)
49