Fan Speed Control For Indoor Units - Daikin ARXG35E3V1B Service Manual

Main Functions
1.4 Fan Speed Control
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
For more information about Hall IC, refer to the troubleshooting for fan motor on page 81.
Phase Steps Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H and HH.
In automatic fan speed operation, the step "SL" is not available.
LLL (Heating thermostat OFF)
LL (Cooling thermostat OFF)
L
ML
M
MH
H
HH (POWERFUL)
Note: 1. During POWERFUL operation, fan operates H tap + 50 - 70 rpm.
2. Fan stops during defrost operation.
Automatic On heating mode, the indoor fan speed will be regulated according to the indoor heat exchanger
temperature and the difference between the room temperature and the required set point.
Airflow Control
for Heating
Automatic The following drawing explains the principle of fan speed control for cooling:
Airflow Control
for Cooling
18
for Indoor Units
Step
= Within this range the airflow rate is automatically controlled when the FAN setting
button is set to automatic.
fan speed
+2.5˚C
+1.5˚C
+0.5˚C
Thermostat
setting
temperature
Cooling Heating
(R4085)
(R4085)
MH
+3˚C
M
+2˚C
ML
+1˚C
L
Phase control
SiBE04-809
hall IC
Dry mode
25/35kW class :
830 - 980 rpm
(During POWERFUL
operation : 1030 rpm)
Difference between room
and set temperature
(R3300)
Function and Control
control.