4.9 Fan control
In RDG20..KN and RDG26..KN, the available fan output signals are one On/Off 1-
speed/3-speed fan or one modulating fan DC 0...10 V and control type can be
selected via P351.
The fan control signal (DC 0…10 V or 3-speed) is selected via DIP switch 6, local
HMI (P351) or tool (ACS, ETS or Siemens smartphone application PCT Go).
The fan operates in automatic mode or at the speed selected in manual mode.
In automatic mode, the fan speed is based 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 I (min. fan speed) as per the
setting of P029 (fan stage in dead zone Comfort mode).
The factory setting for "Fan in the dead zone" is Off.
Only one fan output at one time is On, either Q1, Q2 or Q3.
If the application is set via DIP switches and DIP 6 is set to Off:
● DC 0...10 V fan on Y50 is selected
● P351 = 3 (DC 0...10 V fan) cannot be modified
● 3-speed/1-speed fan output is not available
If the application is set via DIP switches and DIP 6 is set to On:
● 3-speed fan on Q1, Q2, Q3 is selected, P351 = 2
● 1-speed fan (on Q1) can be selected via HMI (P351 = 1) or via tools (ACS or
ETS)
● DC 0...10 V fan output is not available
● 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 or ETS):
● Application and type of fan must be set and downloaded via tools
● If DC 0...10 V fan is set, the type of fan output cannot be modified via HMI
● If 3-speed or 1-speed is selected, P351 can be modified locally to 2 (3-speed)
or 1 (1-speed)
Fan speed and mode can be changed via bus.
For this purpose, the fan command value must be enabled.
Fan speed and mode can be monitored via bus.
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