Daikin FTKD50BVM, Service Manual

Page: 46 / 210

Si04-306 Main Functions
Function and Control 37
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 the troubleshooting for fan motor on page 97.
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 operates 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)
50 · 60 · 71kW class :
750 - 1000 rpm
(During powerful operation :
1050 rpm)
LL (Cooling thermostat OFF)
SL (Silent)
L
ML
M
MH
H
HH (Powerful)
(R2818) (R2818)
-1.5˚C
-0.5˚C
-1˚C
-2˚C
L
ML
M
Thermostat
setting
temperature
Phase control
Difference between room
and set temperature
fan speed
(R2819)
+1.5˚C
+0.5˚C
+2˚C
+1˚C
M
ML
L
fan speed
Difference between room
and set temperature
Phase control
Thermostat
setting
temperature
(R2820)