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Siemens RDF800KN.., RDF800KN/VB, RDD810KN/NF Basic documentation CE1P3174en
Smart Infrastructure 2020-02-21
No. Function of
Description Type
RDF.. RDD..
Enable elec-
tric heater
5 Enable electric
heater
Digital input to enable/disable the electric
heater using remote control.
Enabling the electric heater is also possible
using the bus. In this case, the function
must not be assigned to local input X1 or
X2. See section 3.2.1.
DI ü
Fault
information
6 Fault Digital input to signal an external fault (e.g.
dirty air filter).
If the input is active, ALx displays and a
fault is sent on the bus. See also section
3.11.8.
(Alarm x, where x = 1 for X1, x = 2 for X2).
Note: Fault displays have no impact on the
thermostat's operation. They merely
represent a visual signal.
DI ü ü
X1, X2
(Digital)
7 Monitor input
(digital)
Digital input to monitor the state of an
external switch via the bus, e.g. to send a
local alarm using KNX to the central control
unit.
DI ü ü
X1, X2
(Temp.)
8 Monitor input
(temperature)
Sensor input to monitor the state of an
external sensor (e.g. QAH11.1) via the bus,
e.g. to send a local temperature (0...49°C)
via KNX to the central control unit.
AI ü ü
Presence
detector
10 Presence
detector
Presence detector input to switch the
operating mode to Comfort in case of
occupancy and back to Economy when the
room is unoccupied.
Presence detectionis also possible via bus.
In this case, the function must not be
assigned to local input X1 or X2. See
section 3.2.1.
DI ü ü
· Operating action can be changed between normally open (NO) and normally
closed (NC) using P39 or P41.
· Inputs X1 and X2 must be configured with a different function (1…5, 10).
Exception: 1 or 2 inputs can be configured as fault (6) or monitor input (7, 8).
· X1 is factory-set to "Window contact" (3), X2 to "External sensor" (1).
For more detailed information, refer to section 3.4.
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