Influence Of Pilot Rooms; Boost Function - Rehau NEA SMART 2.0 Service Manual

Allowed Input
mode
HEATING
existing
H C -
/
H x
C x
none x
H x
C x
C -
H -
1)
keine x
Tab. 4-1 Allowed operation modes
1)
Combination is not allowed, heating and cooling is blocked
Parametrization of mixed circuits in heating mode
The calculated set point for the flow temperature, which is controlled
by the mixed circuit is influenced in heating mode mainly by the
following values and parameters:
- Outside temperature, timely filtered
- Settings for heat curve
- Pilot room conditions
In the configuration sequence, each mixed circuit is selected for a
specific heating system. The parameters which are pre-set for this
application can be individually adapted to the characteristics of the
supplied heating system, the needs of the building and the rooms to
be supplied.
Here is some more detailed information about the relevant
parameters.
Filter time constant for outside temperature:
a low filter time constant ("low" means short time, e.g. between 2 and
8 hours) allows a quick reaction to outside temperature jumps for fast
reacting systems as ceiling system or underfloor system with thin
heating elements.
Minimum and maximum flow temperatures:
adaption to energy need or to special floor covering (wooden floor)
Starting point and slope of heat curve:
adaption to energy need.
Relevant parameters
Web page:
Home  Installer  Settings  Mixed circuits
App:
Settings  Installer  Control parameter  Heating  Mixed
circuits
Input
COOLING
State existing State
- - -
ON x OFF
OFF x ON
OFF x OFF
ON - -
OFF - -
- x ON
- x OFF
ON x ON
4.3.2

Influence of pilot rooms

Pilot rooms influence the set point of flow temperature in the following
way:
- When one of the pilot rooms is too cold – where the definition of
"too cold" is influenced by the "economy" parameter, the flow
temperature is increased
- When there is no pilot room which is really "too cold", the flow
temperature is not adjusted
- When the pilot rooms are in general too warm, the flow temperature
is reduced.
The degree of adjustment can be set by parameter.
Relevant parameters
Web page:
not available
App:
Settings  Installer  Control parameter  Mixed circuits
4.3.3

Boost function

Depending on the calculated flow temperature, the system expects a
certain level of return temperature.
When the temperature of the heating elements is too low, because
there was a longer pause time of heating mode or the heating mode
just has been started, the difference between flow and return
temperature will be higher than the calculated limit value. If this
situation continues for a time span of 30 minutes, the flow tempera-
ture is increased for 30 minutes to speed up the heat up process.
After these 30 minutes, the boost function is blocked for the next 30
minutes.
Relevant parameters
Web page:
not available
App:
Settings  Installer  Control parameter  Heating  Heat up
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