SiBE04-101
General Functions
Main Function
27
1.7Fan 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.
Phase Steps
Phase control and fan speed control contains 8 steps: LLL, LL, L, ML, M, MH, H and HH.
= Within this range the airflow is automatically controlled when the AIRFLOW ADJUSTING button
is set to AUTOMATIC
Refer to automatic airflow control on page 27.
Note:
Fan stops during defrost operation.
Automatic Air Flow
Control for Heating
The following drawing explains the principle for fan speed control for heating:
Note:
When there is no operation and the night set mode turns on, the step is low. Refer to “Night set mode” on
page 31.
Automatic Air Flow
Control for Cooling
The following drawing explains the principle of fan speed control for cooling:
Step
Cooling
Heating
Dry mode
LLL (Heating thermostat OFF)
FTXD :
50class : 750-1000 (1080) rpm
60class : 750-1040 (1120) rpm
71class : 750-1040 (1120) rpm
FLX :
50class : 400-980 (1060) rpm
60class : 400-1060 (1140) rpm
∗
( ) for powerful operation
LL
L
ML
M
MH
H
HH (Powerful)
(R1025)
(R1025)
-1.5˚C
-0.5˚C
-1˚C
-2˚C
L
ML
M
Thermostat
setting
temperature
Phase control
Temperature difference between
ambient and set temperature
fan speed
(R1026)
+1.5˚C
+0.5˚C
+2˚C
+1˚C
M
ML
L
fan speed
Temperature difference between
ambient and set temperature
Phase control
Thermostat
setting
temperature
(R1027)
SiBE04-101.book Page 27 Monday, October 15, 2001 3:08 PM