Daikin FTXS09DVJU - Fan Speed Control for Indoor Units

Main Functions SiUS04-702
22 Function and Control
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 126.
Phase Steps Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H and HH.
In automatic operation, the step “SL” is not available.
= 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
On heating mode, the indoor fan speed will be regulated according to the indoor heat exchanger
temperature and the difference between the room temperature and the required set point.
Automatic Air
Flow Control for
Cooling
The following drawing explains the principle of fan speed control for cooling:
Step Cooling Heating
LLL (Heating thermostat OFF)
LL (Cooling thermostat OFF)
L
ML
M
MH
H
HH (Powerful)
(R4085)
(R4085)
+∆2.7˚F
+∆0.9˚F
+∆3.6˚F
+∆1.8˚F
M
ML
L
fan speed
Difference between room
and set temperature
Phase control
Thermostat
setting
temperature
(R4146)