Siemens RDG20 KN Series User Manual

Functions
Multifunctional input, digital input
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Input function
Description
Type
X1/X2/U1/
X3
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 [➙ 128].
(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)
(RDG2..KN)
Digital input to monitor the state of an external switch
via bus
DI
U1, X1, X2
(Digital)
8
Monitor input
(temperature)
(RDG2..KN)
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 [➙ 50].
DI
11
External temperature
limit
The sensor is connected to the pipe and measures
the temperature of the floor heating water. When the
value exceeds the selected limit (P252), heating is
stopped. See also Monitoring and limiting functions
[➙ 54]
AI
12
Coil flow temperature
To avoid cooling flow air in the room, the sensor
measures the coil water temperature and releases
the fan only when the selected minimum water
temperature limit is exceeded (P366). See also Fan
control [➙ 114].
To measure the flow temperature of the return flow
delta temperature control
AI
Hotel
presence
detector
13
Hotel presence detector
Hotel presence detector input switches the operating
mode to Economy when the room is unoccupied and
symbol is displayed (buttons are locked) and
returns to previous operating mode when the room is
occupied.
Hotel 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 [➙ 50].
DI

Siemens RDG20 KN Series Specifications

General

Brand	Siemens
Model	RDG20 KN Series
Category	Thermostat
Language	English