SiUS12-814 Main Functions
Function and Control 27
1.3 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 118.
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. During powerful operation, the fan operates H tap + 50 - 90 rpm.
2. Fan stops during defrost operation.
Automatic
Airflow 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
Airflow Control
for Cooling
The following drawing explains the principle of fan speed control for cooling:
Step Cooling Heating Dry mode
LLL (Heating thermostat OFF) 750 - 1000 rpm
(During powerful operation :
1050 rpm)
LL (Cooling thermostat OFF)
L
ML
M
MH
H
HH (Powerful)
(R2818) (R2818)
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