Fan Speed Control For Indoor Unit - Daikin RMXS-L Series Service Manual

Function of CTXS, FTXS, CDXS, FDXS Series
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. 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 160, 162.
Automatic Fan In automatic fan speed operation, the step SL is not available.
Speed Control
LLL
LL
L
ML
M
MH
H
HH (POWERFUL)
<Cooling>
The following drawing explains the principle of fan speed control for cooling.
CTXS-J, CTXS-H Series
CTXS-L, FTXS-L, CDXS-L, FDXS-L Series
*For CTXS-L and 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.
65
CTXS-J, CTXS-H series
Step Cooling
= The airflow rate is automatically controlled within this range when the FAN setting button
is set to automatic.
Fan speed
+1.5˚C (+2.7˚F)
+0.5˚C (+0.9˚F)
Fan speed
+2.5˚C (+4.5˚F)
+1.5˚C (+2.7˚F)
+0.5˚C (+0.9˚F)
Heating
(R6834)
(R6833)
Room thermistor temperature – target temperature
M
+2˚C (+3.6˚F)
ML
+1˚C (+1.8˚F)
L
Room thermistor temperature – target temperature
MH*
+3˚C (+5.4˚F)
M
+2˚C (+3.6˚F)
ML
+1˚C (+1.8˚F)
L
SiUS181305E
CTXS-L, FTXS-L, CDXS-L, FDXS-L
series
Cooling Heating
(R11681)
(R17357)
(R16967)
(R6834)
Function