Fan Speed Control For Indoor Units - Daikin E-Series Service Manual

Indoor Unit (RA Models)
7.2 Fan Speed Control
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
For more information about Hall IC, refer to the troubleshooting for fan motor on page 324.
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.
LLL
LL
L
ML
M
MH
H
HH (Powerful)
Note: 1. Fan stops during defrost operation.
2. In time of thermostat OFF, the fan rotates at the following speed.
Automatic Air 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.
Flow Control for
Heating
Automatic Air The following drawing explains the principle of fan speed control for cooling:
Flow Control for
Cooling
102
for Indoor Units
Wall mounted type 50-60
class
Step Cooling
(R6037)
H+90
= Within this range the airflow rate is automatically controlled when the FAN setting
button is set to automatic.
Cooling : The fan keeps rotating at the set tap.
Heating : The fan stops.
fan speed
+1.5˚C
+0.5˚C
Thermostat
setting
temperature
DC motor: Rotation speed control
AC motor: Phase control
Wall mounted type 20-35
class, 71 class
Duct connected type
Floor/ceiling suspended
type
Heating Cooling
(R6037)
(R6834)
H+90 H+50
M
+2˚C
ML
+1˚C
L
Hall IC
Floor standing type
Heating Cooling
(R6834)
(R6833)
H+50 H+40
Difference between room
and set temperature
SiAU18-715
control.
Heating
(R6834)
H+40
(R4594)
Function