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SiENBE12-713
Main Functions
Function and Control
65
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 239.
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.
= Within this range the airflow rate is automatically controlled when the FAN setting
button is set to automatic.
Note:
1. Fan stops during defrost operation.
2. In time of thermostat OFF, the fan rotates at the following speed.
Cooling : The fan keeps rotating at the set tap.
Heating : The fan stops.
Automatic Air
Flow Control for
Heating
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.
Automatic Air
Flow Control for
Cooling
The following drawing explains the principle of fan speed control for cooling:
FTXG25/35E
CTXG50E
FVXS25-50F
FTK(X)S50-71E
FTK(X)S71B
FTK(X)S20-50D
FTK(X)S20-35CA
FDK(X)S25-35EA
FDK(X)S25-35CA
FDK(X)S50-60C
FLK(X)S25-60BA
Step
Cooling
Heating
Cooling Heating Cooling Heating
LLL
LL
L
ML
M
MH
H
HH (Powerful) H+70 (FTXG25/35E)
H+50 (CTXG50E)
H+40 (FVXS25-50F)
H+50 (FTXG25/35E,
CTXG50E)
H+40 (FVXS25-50F)
H+90
H+90
H+50
H+50
(R6035)
(R6036)
(R6037)
(R6036)
(R6037)
(R6036)
+1.5°C
+1.5°C
+0.5°C
+0.5°C
+2°C
+2°C
+1°C
+1°C
M
ML
L
f
a
n
s
peed
(R4594)
DC motor: Rot
a
tion
s
peed control
AC motor: Ph
as
e control
Thermo
s
t
a
t
s
etting
temper
a
t
u
re
Difference
b
etween room
a
nd
s
et temper
a
t
u
re
Summary of Contents for FTKS20D3VMW
Page 11: ...Introduction SiENBE12 713 x...
Page 47: ...Specifications SiENBE12 713 36 Specifications...
Page 113: ...Control Specification SiENBE12 713 102 Function and Control...
Page 235: ...Instruction SiENBE12 713 224 System Configuration...
Page 297: ...Check SiENBE12 713 286 Service Diagnosis...
Page 316: ...SiENBE12 713 Outdoor Unit Removal Procedure 305 Step Procedure Points...