Daikin FTKS20D2VMWL, Service Manual

Page: 58 / 228

SiENBE04-507A Main Functions
Function and Control 49
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 115.
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 rotates at H tap + 50 rpm.
2. Fan stops during defrost operation.
3. In time of thermostat OFF, the fan rotates at the following speed.
Cooling: The fan keeps rotating at the set tap.
Heating: The fan stops.
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
20 · 25 · 35kW class :
670 - 880 rpm
(During powerful operation :
720 - 930 rpm)
LL
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
ML
M
L
Thermostat
setting
temperature
DC motor: Rotation speed control
Difference between room
and set temperature
fan speed
(R4558)
(R4559)
+1.5°C +1.5°C
+0.5°C +0.5°C
+1°C +1°C
+2°C +2°C
ML
M
L
Thermostat
setting
temperature
DC motor: Rotation speed control
Difference between room
and set temperature
fan speed
(R4558)