Siemens RDG20 KN Series User Manual

Functions
Multifunctional input, digital input
4
A6V11545892_en--_e
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● Also be disabled (P350 = 0)
● Run only in heating (P350 = 2) sequence
● Run only in cooling (P350 = 3) sequence
For this application, only DC fan control is available at output Y50.
4.10 Multifunctional input, digital input
The thermostat has 3 multifunctional inputs X1, X2 and U1.
An NTC type sensor like NTC 3k, a LG-Ni1000 (AI, analog input) or a switch (DI,
digital input) can be connected to the input terminals. The functionality of the inputs
can be configured via P150 + P151 for X1, P153 + P154 for X2, and P155 + P156
for U1 (RDG2..KN)/X3 (RDG2..T).
The current temperature or state of the inputs X1/X2 and U1 is available on the bus
for monitoring purposes. (RDG2..KN)
The parameters can be set to the following values:
#
Input function
Description
Type
X1/X2/U1/
X3
0
Not used
No function
--
1
External/return air
temperature
Sensor input for external room temperature sensor
or return air temperature sensor to acquire the
current room temperature.
AI
Heating/
cooling
changeover
2
Heating/cooling
changeover
Sensor input for "Automatic heating/cooling
changeover" function.
A switch can also be connected rather than a sensor.
Important: Switching state configured via P151,
P154, P156. See also Additional functions [➙ 48].
Heating/cooling changeover is possible via bus. In
this case, the function must not be assigned to local
inputs X1, X2, U1. See also Additional functions
[➙ 48].
Diagnostic value 0 ˚C is displayed for closed contact,
100 ˚C for open contact, if a switch is connected.
AI/DI
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 [➙ 29].
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 [➙ 77].
DI

Siemens RDG20 KN Series Specifications

General

Brand	Siemens
Model	RDG20 KN Series
Category	Thermostat
Language	English