SiBE041102_A Main Functions
Function and Control 13
1.4 Fan Speed Control for Indoor Unit
Outline Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H, and HH.
The airflow rate can be automatically controlled depending on the difference between the room
thermistor temperature and the target 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 57.
Automatic Fan
Speed Control
In automatic fan speed operation, the step “SL” is not available.
= The airflow rate is automatically controlled within this range when the FAN setting
button is set to automatic
.
<Cooling>
The following drawing explains the principle of fan speed control for cooling.
*In automatic fan speed operation, upper limit is at M tap in 30 minutes from the operation start.
<Heating>
On heating mode, the fan speed is regulated according to the indoor heat exchanger
temperature and the difference between the room thermistor temperature and the target
temperature.
Note: 1. During POWERFUL operation, fan rotates at H tap + 50 rpm.
2. Fan stops during defrost operation.
COMFORT
AIRFLOW
Operation
The fan speed is controlled automatically.
The latest command has the priority between POWERFUL and COMFORT AIRFLOW.
Step Cooling Heating
LLL
LL
L
ML
M
MH
H
HH (POWERFUL)
(R6833)
(R6834)
(R14588)
Fan speed
+2.5°C
+1.5°C
+0.5°C
MH*
M
ML
L
+3°C
+2°C
+1°C
Room thermistor temperature – target temperature
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