Fan Speed Control For Indoor Unit - Daikin CTXG09QVJUW Service Manual

SiUS121630EA
2.2

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 In automatic fan speed control, 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.
*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.
COMFORT CTXG, CTXS, FTXS Series
AIRFLOW
Operation
Functions and Control
Step
= The airflow rate is automatically controlled within this range when FAN button is set to
automatic.
Fan speed
+2.5°C (+4.5°F)
+1.5°C (+2.7°F)
+0.5°C (+0.9°F)
The fan speed is controlled automatically within the following steps.
Cooling
L tap ~ MH tap (same as AUTOMATIC)
Heating
In order to obtain a comfortable airflow, the fan speed may be set to a rate different from
automatic fan speed control.
The latest command has the priority between POWERFUL and COMFORT AIRFLOW.
CTXG, CTXS, FTXS, CDXS, FDXS, FVXS Series Functions
Cooling Heating
(R6834)
(R11681)
Room thermistor temperature – target temperature
MH*
+3°C (+5.4°F)
M
+2°C (+3.6°F)
ML
+1°C (+1.8°F)
L
(R21654)
45