Fan Speed Control For Indoor Unit - Daikin FTX20K(2)V1B Service Manual

SiBE041525F
1.4

Fan Speed Control for Indoor Unit

Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H, and HH.
Outline
The airflow rate can be automatically controlled depending on the difference between the room
thermistor temperature and the target temperature.
In automatic fan speed control, the step SL is not available.
Automatic Fan
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.
 The fan speed is controlled automatically.
COMFORT
 The latest command has the priority between POWERFUL and COMFORT AIRFLOW.
AIRFLOW
Operation
Functions and Control
Step
= The airflow rate is automatically controlled within this range when the FAN setting
button is set to automatic.
Fan speed
+2.5°C
+1.5°C
+0.5°C
Cooling Heating
(R11681) (R6834)
Room thermistor temperature – target temperature
MH*
+3°C
M
+2°C
ML
+1°C
L
Main Functions
(R14588)
18