SiEBE18-526 Indoor Unit (RA Models)
Function 81
7.2 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 260.
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)
50 · 60 · 71kW class :
750 - 1000 rpm
(During powerful operation :
1050 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
fan speed
(R4593)
Thermostat
setting
temperature
DC motor: Rotation speed control
AC motor: Phase control
Difference between room
and set temperature
+1.5°C
+0.5°C
+2°C
+1°C
M
ML
L
fan speed
(R4594)
Thermostat
setting
temperature
DC motor: Rotation speed control
AC motor: Phase control
Difference between room
and set temperature
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