Fan Speed Control For Indoor Unit - Daikin FTXS20K2V1B Service Manual

Main Functions
1.4

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 70.
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.
*In automatic fan speed operation, 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: 1. During POWERFUL operation, the fan rotates at H tap + 80 rpm.
2. The fan stops during defrost operation.
COMFORT
AIRFLOW
Operation
14
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
The fan speed is controlled automatically.
The latest command has the priority between POWERFUL and COMFORT AIRFLOW.
Cooling Heating
(R11681) (R6834)
Room thermistor temperature – target temperature
MH*
+3°C
M
+2°C
ML
+1°C
L
SiBE041134
(R14588)
Function and Control