Fan Speed Control For Indoor Units - Daikin ATXS35EV1B7 Service Manual

SiBE04-824
1.3

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 trouble shooting for fan motor on page 85.
Phase Steps Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H and HH.
In Automatic operation, the step "SL" is not available.
LLL
LL
L
ML
M
MH
H
HH (POWERFUL)
Note: 1. During POWERFUL operation, fan rotates at H tap + 50 - 90 rpm.
2. Fan stops during defrost operation.
3. In time of thermostat OFF, the fan rotates at the following speed.
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
Function and Control
Step
= Within this range the airflow rate is automatically controlled when the FAN setting
button is set to automatic.
Cooling: The fan keeps rotating at the set tap.
Heating: 25/35 class: The fan stops.
50 class: The fan rotates at LLL tap.
fan speed
+1.5˚C
+0.5˚C
Thermostat
setting
temperature
DC motor: Rotation speed control
Cooling Heating
25 / 35 class :
670 - 880 rpm
(During POWERFUL operation :
720 - 930 rpm)
50 class:
(R5310)
980 - 1090 rpm
(R8356)
M
+2˚C
ML
+1˚C
L
Main Functions
Dry mode
Difference between room
and set temperature
(R4559)
19