Fan Control - Siemens RDB160BN Basic Documentation

5.1 Fan control

A6V11917618_en--_b
No exercises occur for electric heaters. In other words, the function does not
impact an electric heater.
DC 0...10 V signal
AO1 and AO2 can be set as outputs, providing DC 0...10 V signal for modulating
valves.
Both outputs can be set via parameters P16 and P17 with different ranges:
● 0...10 V
● 2...10 V
● 10...2 V (inverse signal)
● 10...0 V (inverse signal)
NOTICE
AO2 is used as a DC fan output when the fan is set to DC. Parameter P17 is
not active.
The thermostat controls either 1-speed, 2-speed, 3-speed or DC 0...10 V fan.
The fan operates in automatic mode or in manual mode with the selected
speed. The fan mode and speed can be changed and monitored via BACnet.
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 minimum fan speed.
1-speed, 2-speed, 3-speed fan
The thermostat can control one 1-, 2- or 3-speed fans selected via control
parameter P30. The 1-speed fan is connected to terminal DO1, the 2-speed fan
is connected to terminals DO1 and DO2, and the 3-speed fan is connected to
terminals DO1, DO22 and DO33.
On 2- or 3-speed fans, only one fan output can be on at the same time, either
DO1, DO2 or DO3.
3-speed fan control with modulating heating / cooling control
The individual switching points for 'On' for each fan stage is defined via control
parameters P26 to P28. The fan speed hysteresis is set via parameter P29. The
factory setting is 5 %.
Control outputs 5
Fan control
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