Digital Input And Output Signals; Digital Input Signal - Rehau NEA SMART 2.0 Service Manual

4.7

Digital input and output signals

The digital input and output signals of NEA SMART 2.0 System allow
- Activation of devices such as pumps, boiler, chiller
- Switching of valves
- Communication of status / operating mode
- Receiving warning / alarm information
- Receiving status information from a super ordinated system
This chapter describes customisable input/output signals
which are not part of a pre-defined control function that
exist for flow temperature and control of dehumidifiers.
4.7.1

Digital input signal

The digital inputs require a potential free switch (dry
contact).
INPUT signal Available on
Dew point monitor Room unit
Base, R-Module
Note:
Dew point monitor signal
U-Module (mixed circuit)
is triggered when the po-
tential free switch is open
Window contact Room unit
Note:
Base, R-Module
Window contact signal is
active when the potential
open
free switch is
HEATING Base, R-Module
COOLING Base, R-Module
Energy Level Base, R-Module
REDUCED LOCAL
Energy Level Base, R-Module
REDUCED GLOBAL
Energy Level Base, R-Module
HOLIDAY / ABSENCE
Tab. 4-2 Available digital input signals and system reaction
1) Applied to all rooms assigned to this Base and R-Module
2) Applied to all rooms in the entire installation
3)
Applied to all rooms in the entire installation
32
Reaction
Cooling of this room is stopped, associated dehumidifier is activated.
Cooling of all rooms assigned to the base and to connected R-Module is stopped,
associated dehumidifiers are activated.
Mixed circuit is closed.
Heating / cooling is stopped for 30 minutes.
After this, energy level of this room is switched to REDUCED.
For all rooms assigned to the base and to connected R-module the same measu-
res as described above apply.
System is restricted to operating modes neutral or heating.
The mode heating / cooling (automatic mode) may be activated, but cooling will
not start as long as the input signal HEATING is active.
System is restricted to operating modes neutral or cooling.
Heating / cooling (automatic mode) may be activated, but heating will not start as
long as the input signal COOLING is active.
All rooms 1) which are in TIMER mode go to energy level REDUCED.
All rooms 2) which are in TIMER mode go to energy level REDUCED.
All rooms 3) which are in TIMER mode go to energy level HOLIDAY / ABSENCE.