Si01-501 Functions of FT25/35/50D, FT09/13/15D Models
Defails of Functions 23
1.2 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 rotation speed control, or phase
and Hall IC control.
For more information about Hall IC, refer to trouble shooting for fan motor on page 109.
Fan Speed Steps Fan speed control contains 7 steps: LLL, LL, L, ML, M, MH, H.
= 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 + 80 rpm.
2. In time of cooling thermostat OFF, the fan keeps rotating at the set tap.
Automatic Air
Flow Control for
Cooling
The following drawing explains the principle of fan speed control for cooling:
Step Cooling Dry mode
LLL
940 - 970 rpm
(During powerful operation :
990 - 1020 rpm)
LL
L
ML
M
MH
H
(R4830)
+1˚C
0˚C
+2˚C
+1˚C
M
ML
L
fan speed
Difference between room
and set temperature
DC motor: Rotation speed control
AC motor: Phase control
Thermostat
setting
temperature
(R4831)
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