Siemens RDG20 KN Series Basic Documentation page 113

# Input function
3 Window contact
Window
contact
4 Dewpoint monitor
5 Enable electric heater
Enable
electric
heater
6 Fault
Fault
information
7 Monitor input (digital)
U1, X1, X2
(Digital)
Monitor input
8
(temperature)
U1, X1, X2
(Digital)
Supply air temperature
9
limitation
U1, X1, X2
(Temp.)
10 Presence detector
Presence
detector
A6V11545892_en--_c
Description
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].
Digital input for dewpoint sensor to detect
condensation. Cooling is stopped in the event of
condensation.
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].
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.
Digital input to monitor the state of an external
switch via bus
Sensor input to monitor the state of an external
sensor (e.g., NTC 3k) via bus.
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)
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].
Functions
Multifunctional input, digital input
4
Type
X1/X2/U1
DI
DI
DI
DI
DI
AI
AI
DI
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