Heating And Cooling Systems; Available Systems; Combination Of Systems; Supply Of Systems - Rehau NEA SMART 2.0 Service Manual

4.2

Heating and cooling systems

4.2.1

Available systems

The following systems may be chosen during configuration sequence:
- Underfloor
- Wall
- Ceiling
- Fan coils 1)
1)
Fan coils in preparation
Each system may be used for
- heating only
- heating and cooling
- cooling only
Note:
Room temperature control for BKT systems (TABS) is not possible. The
high thermal mass of a BKT system does not allow to compensate
effects of varying internal loads or fast changes of outside conditions.
4.2.2

Combination of systems

It is possible to combine all types of systems in all modes of operation
in each room.
Example:
Room 1: Underfloor heating
Ceiling cooling
Room 2: Underfloor heating / cooling
Room 3: Underfloor heating
Ceiling heating
Room 4: Underfloor heating / cooling
Ceiling cooling
Note:
For each system in each room at least 1 channel of the NEA SMART
2.0 Base is needed.
In the example above at least 7 channels are necessary.
A combination of different systems (heating / cooling) in one
room does not require additional measures like zone valves or
external switch boxes to enable or disable valve actuators.
All logical connections are done by the controller based on the
definition of manifolds and connected systems during
commissioning.
4.2.3

Supply of systems

The NEA SMART 2.0 System can control up to 3 mixed circuits in
heating and cooling mode, which can be selected for the available
systems
- Underfloor
- Wall and
- Ceiling
For each type of application there is a set of parameters predefined
which is automatically loaded when the type of mixed circuit is
selected.
The system specific default parameters include the appropriate flow
temperature control, system heat-up times and define the system
response to changing outside temperatures.
Supply from external sources can be used, too. But in this case, the
flow temperatures cannot be influenced.
Relevant parameters
Web page:
Home  Installer  Settings  Mixed circuits
App:
Settings  Installer  Control parameter  Submenus
4.3

Heating mode

4.3.1

Start and stop of heating mode

Heating mode of the system may be started and stopped depending
on the following conditions or parameters:
- Selected operating mode by user
- Defined heating or cooling period
- Filtered outside temperature, maximum outside temperature at
which heating is deactivated and applied hysteresis function
- Actual comfort level
- Temperature in rooms which are defined as "pilot rooms"
- External input signals which are defined as HEATING or COOLING
Selected operating mode
Heating mode can be started only when the system is set to HEATING
/ COOLING, only HEATING or MANUAL HEATING.
Defined heating or cooling period
When there is a definition for heating period, heating mode is started
only during this period. Heating mode is also not started when system
is in a defined cooling period.
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