Service Manual

SiUS181631EA CTXG, CTXS, FTXS, CDXS, FDXS, FVXS Series Functions
Functions and Control 77
7.3 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.
Automatic Fan
Speed Control
In automatic fan speed control, the step SL is not available.
= The airflow rate is automatically controlled within this range when FAN button is set to
automatic
.
Cooling
The following drawings explain the principle of fan speed control for cooling.
CTXS-J, CTXS-H Series
CTXG, CTXS-L, FTXS-L, CDXS, FDXS, FVXS Series
*For CTXG, CTXS-L, FTXS-L, and FVXS 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.
Note: The fan stops during defrost operation.
CTXS-J, CTXS-H series
CTXG, CTXS-L, FTXS-L, CDXS, FDXS,
FVXS series
Step Cooling Heating Cooling Heating
LLL
LL
L
ML
M
MH
H
HH (POWERFUL)
(R6833)
(R6834)
(R11681)
(R6834)
Room thermistor temperature – target temperature
+1.5˚C (+2.7˚F)
+0.5˚C (+0.9˚F)
+2˚C (+3.6˚F)
+1˚C (+1.8˚F)
M
ML
L
Fan speed
(R17357)
(R16967)
Room thermistor temperature – target temperature
MH*
M
ML
L
+3˚C (+5.4˚F)
+2˚C (+3.6˚F)
+1˚C (+1.8˚F)
Fan speed
+2.5˚C (+4.5˚F)
+1.5˚C (+2.7˚F)
+0.5˚C (+0.9˚F)