3.8 Fan control
Different fan output signals are available depending on the thermostat type:
Control output
Product no.
Control type
selected via
( ) Number of outputs
1) Selectable via P53 or DIP switch 4 on RDG160KN
The fan operates in automatic mode or at the selected speed with manual mode.
In automatic mode, the fan speed depends on the setpoint and the current room
temperature. When the room temperature reaches the setpoint, the control valve
closes and the fan switches off or stays at fan speed 1 (min. fan speed) according
to the setting of parameters P15 (RDG160KN: fan stage in dead zone) and P60
(fan kick).
Factory setting for "Fan in the dead zone":
• RDG100KN: Fan speed 1: (P60 = 0)
• RDG160KN: Fan speed OFF: (P15 = 0, P60 = OFF)
Only one fan output at a time is on, either Q1, Q2 or Q3.
The type of the fan output (DC 0...10 V, 3-speed or single-speed) can be set via
DIP switch 4, local HMI (P53) or tool (ACS, ETS).
If application is set via DIP switches and DIP 4 = Off :
• DC 0...10 V fan (ECM) on Y50 is selected
• Parameter P53 = 3 (ECM fan) can not be modified
• 3- / 1-speed fan output is not selectable
If application is set via DIP switches and DIP 4 = On
• 3-speed fan on Q1, Q2, Q3 is selected, parameter P53 = 2
• 1-speed fan (on Q1) can be selected via HMI (P53 = 1) or via tool (ACS, ETS)
• DC 0...10 V (ECM) fan output is not selectable
• 3-speed fan output is enabled only if the application has also been selected
via DIP switches
If all DIP switches are Off (commissioning via tool ACS, ETS):
• Application and type of fan have to be set and downloaded via tool
• If ECM fan has been set, the type of fan output can not be modified via HMI
• If 3-speed or 1-speed has been selected, parameter P53 can be modified
locally to P53 = 2 (3-speed) or P53 = 1 (1-speed)
The fan speed and mode can be changed via bus.
For this purpose, the fan command value needs to be enabled.
The fan speed and mode can be monitored via bus.
Selection fan output
on RDG160KN
stage 1-2-3
53 / 102
Siemens RDG100KN, RDG160KN Basic documentation CE1P3191en
Building Technologies Functions 2014-05-23
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