Fan Speed Control For Indoor Unit - Daikin FTXM-V Series Service Manual

SiUS042113E
1.5

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.
Part 4 Functions and Control
Step
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 Heating
Room thermistor temperature – target temperature
MH*
+3°C (+5.4°F)
M
+2°C (+3.6°F)
ML
+1°C (+1.8°F)
L
Main Functions
R4003512
(R21654)
29