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

Main Functions
1.4

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 216.
Phase Steps
Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H and HH.
LLL
LL
SL
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
Flow Control for
temperature and the difference between the room temperature and the required set point.
Heating
Automatic Air
The following drawing explains the principle of fan speed control for cooling:
Flow Control for
Cooling
70
FTXG25/35E
ATXG25/35E
Step Cooling Heating Cooling Heating Cooling Heating Cooling Heating
(R6035)
H+70 H+50
= 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
CTXG50E
ATXG50E
(R6035)
(R6036) (R6036)
H+50 H+50
M
ML
L
FTK(X)S50E FTK(X)S20-50D
ATX50E ATXS20-50E
FTK(X)S20-35CA
ATXS20-35DA
FDK(X)S25-35EA
FDK(X)S25-35CA
FDK(X)S50C
FVK(X)S25-50BA
FLK(X)S25-50BA
(R6037)
(R6036)
H+90 H+90 H+50
Difference between room
+2°C
and set temperature
+1°C
Function and Control
SiENBE12-620
(R6037)
(R6036)
H+50
(R4594)