Fan Speed Control For Indoor Unit - Daikin 4MXL-T Series Service Manual

RA Indoor Unit Functions
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 operation, the step SL is not available.
Speed Control
to automatic.
 Cooling
The following drawing explains the principle of fan speed control for cooling.
∗ The upper limit is at 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(s)
The fan stops during defrost operation.
COMFORT FTXR, CTXG, CTXS, FTXS Series
AIRFLOW  The fan speed is controlled automatically within the following steps.
Operation
 The latest command has the priority between POWERFUL and COMFORT AIRFLOW.
64
LLL
LL
L
ML
M
MH
H
HH (POWERFUL)
= The airflow rate is automatically controlled within this range when FAN setting button is set
Fan speed
+2.5°C (+4.5°F)
+1.5°C (+2.7°F)
+0.5°C (+0.9°F)
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.
Step Cooling
Room thermistor temperature – target temperature
MH*
+3°C (+5.4°F)
M
+2°C (+3.6°F)
ML
+1°C (+1.8°F)
L
SiUS121827E
Heating
R4003512
(R21654)
Part 4 Functions and Control