Siemens RDB160BN - Fan Speed Control and Operation Modes

Control outputs
Fan operation
5
22
| 52 A6V11917618_en--_b
3-speed fan control with On/Off heating / cooling control
In applications with 2-position control, the switching point for the fan speeds
can be defined via control parameters P26, P27 and P28.
Selection of fan output
Different fan output signals are available based on the setting:
Product
On/Off
1-/2-/3-speed
fan
Modulating fan
DC 0…10 V
Control type
selected via
RDB160BN
DO1, DO2, DO3
AO2
P77, P30
The type of fan output (DC 0...10 V, 1-, 2- or 3-speed) can be selected via local
HMI using parameters P77 and P30 or via BACnet objects.
● P77 is used to select the fan type (1-, 2- or 3-speed fan or DC fan).
● P30 is used to select the number of fan speeds.
5.2 Fan operation
Fan operation for heating / cooling mode, or disabled
The thermostat can be used on universal applications such as chilled / heated
ceilings and radiator.
Fan operation can be limited to active for cooling only or heating only, or even
to disabled via control parameter P25 ('Fan control in auto mode').
The manual fan operation is locked with parameter P66.
● If P66 is set to 0, the fan is disabled in auto mode as per parameter P25.
The user can still manually set the speed.
● If P66 is set to 1, the fan is disabled in auto mode as per parameter P25.
The user cannot manually set the fan speed. Fan operation is locked.
20%
P26
60%
P27
100%
P28
Speed 1
Speed 2
Speed 3
P29
5%
Valve on
Valve Off
20%
P26
60%
P27
100%
P28
P29
5%
w
Room T
X
DZ
P05
2K
3 speed fan
Room T
T
T