Siemens RDG2 KN Series Basic Documentation

Functions
Multifunctional input, digital input
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Input function
Description
Type
X1/X2/U1
Window
contact
3
Window contact
Digital input to change over the operating mode
to Protection.
If the window contact is active, user operations
are ineffective and OFF is displayed.
Window contact is also possible via bus. In this
case, do not assign the function to local inputs
X1, X2 or U1. See also Operating modes [➙ 27].
DI
4
Dewpoint monitor
Digital input for dewpoint sensor to detect
condensation. Cooling is stopped in the event of
condensation.
DI
Enable
electric
heater
5
Enable electric heater
Digital input to enable/disable the electric heater
via remote control.
Enable electric heater is also possible via bus. In
this case, do not assign the function to local
inputs X1, X2, U1. See also Control sequences
[➙ 75].
DI
Fault
information
6
Fault
Digital input to signal an external fault (e.g.: dirty
air filter).
If the input is active, ALx is displayed and a fault
is sent on the bus. See also Fault and alarms
function on KNX [➙ 125].
(Alarm x, with x = 1 for X1, x = 2 for X2, x = 3 for
U1).
Note: Fault displays have no impact on
thermostat operation. They merely represent a
visual signal.
DI
U1, X1, X2
(Digital)
7
Monitor input (digital)
Digital input to monitor the state of an external
switch via bus
DI
U1, X1, X2
(Digital)
8
Monitor input
(temperature)
Sensor input to monitor the state of an external
sensor (e.g., NTC 3k) via bus.
AI
U1, X1, X2
(Temp.)
9
Supply air temperature
limitation
Sensor input to acquire supply air temperature.
The thermostat controls the room temperature via
built-in sensor. The control output (DC 0...10 V) is
reduced if the supply air temperature drops below
the min. limit or exceeds the max. limit (P063 ,
P064)
AI
Presence
detector
10
Presence detector
Presence detector input switches the operating
mode to Comfort when the room is occupied and
returns to previous operating mode when the
room is unoccupied.
Presence detector is also possible via bus. In this
case, do not assign the function to local inputs
X1, X2 or U1. See also Presence detector [➙ 49].
DI

Siemens RDG2 KN Series Specifications

General

Brand	Siemens
Model	RDG2 KN Series
Category	Thermostat
Language	English