Fan Speed Control For Indoor Units - Daikin FTK25JVE9 Service Manual

General Functionality
1.7

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 'Hall IC check (A6)' on page 68.
Phase steps Phase control and fan speed control contains 8 steps: LLL, LL, L, ML, M, HM, H and HH.
LLL (Heating thermostat
OFF)
LL
L
ML
M
MH
H
HH (Powerful)
Refer to automatic airflow rate control on page 26.
Note: 1. During powerful operation, fan operate H tap + 50 - 70 rpm.
2. Fan stops during defrost operation.
Automatic air The following drawing explains the principle for fan speed control for heating:
flow control for
heating
Note: When there is no operation and the night set mode turns on, the step is low. Refer to "Night set
mode" on page 29.
Automatic air The following drawing explains the principle of fan speed control for cooling:
flow control for
cooling
26
Step Cooling
= Within this range the airflow rate is automatically controlled when the AIRFLOW
ADJUSTING button is set to AUTOMATIC
Thermostat
setting
temperature
-0.5˚C
-1.5˚C
fan speed
fan speed
+1.5˚C
+0.5˚C
Thermostat
setting
temperature
Heating
J type : 800 - 980 rpm
(During powerful operation :
1050 rpm)
(R1906) (R1906)
Phase control
L
-1˚C
Temperature difference between
ML
ambient and set temperature
-2˚C
M
M
+2˚C Temperature difference between
ML
ambient and set temperature
+1˚C
L
Phase control
Dry mode
(R1908)
(R1909)
Main Function
Si04-115