Basic Documentation

Functions
Multifunctional input, digital input
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A6V12166490_en--_c
4.9 Multifunctional input, digital input
The thermostat has 2 multifunctional inputs X1 and X2.
An NTC type sensor such as NTC 3k (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 P38 + P39 for X1, P40 + P41 for X2.
The parameters can be set to the following values:
#
Function of input
Description
Type
X1/X2
0
Not used
No function
--
1
Room temperature external
sensor/return air temperature
Sensor input for external room temperature sensor or
return air temperature sensor to acquire the current
room temperature, or floor heating temperature sensor
to limit the heating output.
Note: The room temperature is acquired via the built-
in sensor if the floor temperature limitation function is
enabled in parameter P51.
AI
2
Heating/cooling changeover
Analog input for "Automatic heating/cooling
changeover" function.
A sensor can be connected via input X1 or X2. (For
heating/cooling changeover, see Sensors and
changeover functions [➙ 26].
AI
3
Window contact
Digital input to change over the operating mode to
Protection.
If the window contact is active, user operations are
ineffective.
DI
4
Dewpoint sensor
Digital input for a dewpoint sensor to detect
condensation. Cooling is stopped if condensation
occurs.
DI
5
Enable electric heater
Digital input to enable/disable the electric heater via
remote control.
DI
6
Fault input
Digital input to signal an external fault (e.g.: dirty air
filter).
Note: Fault displays have no impact on the
thermostat's operation. They merely represent a visual
signal.
DI
7
Monitor input (digital)
Digital input to monitor the state of an external switch
DI
8
Monitor input (analog)
Sensor input to monitor the state of an external sensor
(e.g., NTC 3k)
AI
9
Heating/cooling changeover
Digital input for "Automatic heating/cooling
changeover" function.
A switch instead of a sensor can also be connected.
(Switch closed = cooling, see Additional functions
[➙ 25]
Diagnostic value 0 ˚C is displayed for a closed contact,
100 ˚C for an open contact, if a switch is connected.
DI