Daikin 2MKS40DVMB, Service Manual

Page: 46 / 230

SiBE12-519 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 138.
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 - 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
20 · 25 · 35kW class :
670 - 880 rpm
(During powerful operation :
720 - 930 rpm)
LL
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
DC motor: Rotation speed control
AC motor: Phase control
Difference between room
and set temperature
fan speed
(R4593)
+1.5˚C
+0.5˚C
+2˚C
+1˚C
M
ML
L
fan speed
Difference between room
and set temperature
Thermostat
setting
temperature
(R4594)
DC motor: Rotation speed control
AC motor: Phase control