Main Functions SiUS12-928_B
39 Function and Control
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 150, 152.
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.
CTXS-J, CTXS/FTXS-H, FDXS-D Series
CTXS/FTXS-L, CDXS/FDXS-L Series
*For CTSX/FTXS-L series, the upper limit is M tap in 30 minutes from the operation start.
<Heating>
In heating operation, the fan speed is regulated according to the indoor heat exchanger
temperature and the difference between the room thermistor temperature and the target
temperature.
CTXS-J, CTXS/FTXS-H, FDXS-D
series
CTXS/FTXS-L, CDXS/FDXS-L
series
Step Cooling Heating Cooling Heating
LLL
LL
L
ML
M
MH
H
HH (POWERFUL)
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