Digital Inputs - Rehau NEA SMART 2.0 Service Manual

Device Possible Function
Remote Limiting floor temperature to a minimum and maximum
sensor value (lower limit valid for cooling, upper limit for he-
ating). This function is useful, e.g. to protect wooden
floors from overheating or chilled surfaces from getting
to cold.
Same as above with additional option to maintain a mi-
nimum surface temperature. This can be used as a
comfort function in bathrooms or similar.
Remote room temperature probe (room temperature
control only by this value). This function is useful if the
NEA SMART 2.0 Room unit cannot be placed inside the
room it has to control or if there is not enough space.
Floor temperature control ONLY. The room is solely con-
trolled via the floor surface temperature.
Remote room temperature probe (room temperature
control by average value between remote probe and
room unit). This function can be used if the tempera-
ture of the room should be controlled via the average
temperature between two locations. The remote probe
is limited to 3 m cable length.
The system can only operate in neutral or heating
mode. The heating / cooling mode (in automatic mode)
can be activated, but the cooling does not start,
as long as the input signal HEATING is active.
Tab. 5-2 Analog input Room unit
The input of the NEA SMART 2.0 Room unit can either be configured
as analog (see table above) or digital (see next chapter) but not as
both simultaneously.
NEA SMART 2.0 U-Module when used for mixed circuit control
Device Function
Flow temperature Must be installed when mixed circuit is con-
sensor trolled.
Return temperature Recommended to optimize flow temperature
sensor control.
Remote probe A wireless or wired external temperature sen-
outside temperature sor must be installed whenever a mixed cir-
cuit is present.
Tab. 5-3 Analog input U-Module
40
5.3.4

Digital Inputs

Digital Inputs can be used to receive information from other devices.
Digital Inputs can be received either via the NEA SMART 2.0 Room
unit, the NEA SMART 2.0 Base or the NEA SMART 2.0 R-Module.
NEA SMART 2.0 Room Unit
One of the functions described below can be defined during the setup
of the system.
Device Function
Window contact A hard wired window contact can be used to
make sure that heating or cooling is stopped
when the window is open.
Dew point A dew point monitor detects condensation on pi-
sensor pes or surface and stops cooling in this room.
Tab. 5-4 Digital input room unit
The input of the NEA SMART 2.0 Room unit can either be configured
as analog (chapter before) or digital (see table above) but not as both
simultaneously.
NEA SMART 2.0 Base and R-Module
A maximum of four digital inputs can be configured for one NEA
SMART 2.0 Base.
One digital input can be configured for the NEA SMART 2.0 R-Module.
Within a NEA SMART 2.0 Base (and optional R-Module), a function
can only be assigned once. That means, it is not possible to assign
the same function to more than one input.