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

SiBE12-817
1.4 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 203.
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 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.
Airflow Control
for Heating
Automatic The following drawing explains the principle of fan speed control for cooling (reference):
Airflow Control
for Cooling
Function and Control
for Indoor Units
FTXS20-50G
FTXG25/35E
CTXG50E
FVXS25-50F
Step Cooling
(R6035)
H+70 (FTXG25/35E)
H+50 (FTXS20-50G,
CTXG50E)
H+40 (FVXS25-50F)
= 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 keeps rotating at LLL tap (FTXS, FVXS series) or stops (the other models).
fan speed
+1.5˚C
+0.5˚C
Thermostat
setting
temperature
DC motor: Rotation speed control
AC motor: Phase control
FTXS20-50G
FDK(X)S25-35EA
FDK(X)S50C
FLK(X)S25-50BA
Heating
(R6036)
H+50 (FTXS20-50G,
FTXG25/35E,
CTXG50E)
H+40 (FVXS25-50F)
M
+2˚C Difference between room
ML
and set temperature
+1˚C
L
Main Functions
Hall IC control.
Cooling Heating
(R6037)
(R6036)
H+50 H+50
(R4594)
49