Daikin FTY25GXV1, Service Manual

Page: 26 / 124

SiBE01-829 Functions
Functions and Control 15
1.2 Fan Speed Control for Indoor Units
Control Mode The airflow rate can be automatically controlled depending on the difference between the set
temperature and the room temperature. This is done through phase control and Hall IC control.
For more information about Hall IC , refer to troubleshooting for fan motor on page 47.
Phase Steps Phase control and fan speed control contains 5 steps: LL, L, M, H, and HH.
You can choose the airflow rate between LL and HH with the remote controller
= The airflow rate is chosen from L-M-H tap when the fan setting button is set to automatic.
Note: 1. During POWERFUL operation, fan operates at 1280-1370rpm.
2. Fan stops during defrost operation.
3. In time of thermostat OFF, the fan rotates at following speed.
Cooling : The fan keeps rotating at the set tap.
Heating : The fan stops when the indoor heat exchanger temperature is below 30°C.
Airflow Rate
Control
for
Heating
The following drawing explains the principle for fan speed control for heating:
Airflow Rate
Control for
Cooling The following drawing explains the principle of fan speed control for cooling:
Step
LL (Quiet)
L
M
H
HH (POWERFUL)
Cooling Heating
(R8509) (R8510)
+3.0
L
M
H
Defference between
room and set
temperature
Phase control
Fan speed
+1.0
0
+2.0
(R8486)
H
M
L
Fan speed
Phase control
+1.5
+0.5
0.5
Defference between
room and set
temperature
(R8487)