Summer Compensation; Supply Control Of Heat And Cool Media; Manifold Selection; Pump Control - Rehau NEA SMART 2.0 Service Manual

To reduce potential noise polution caused by running dehumidifiers at
otherwise quiet times, a weekly program can be used to start the
dehumidifiers during "quiet times" only when a 2nd, higher limit of
relative humidity or dew point is exceeded.
Dehumidifier control:
For each dehumidifier 2 outputs of the system may be used:
Hydraulic:
This signal opens a valve which allows the supply of a heat exchanger
which is integrated in the dehumidifier. The use of this signal is
optional and depends on the type of dehumidifier used. This signal is
activated first.
Compressor:
Starts the compressor. When the "hydraulic" signal is defined, the
compressor signal is delayed for 3 minutes.
Dehumidifiers have minimum and maximum run time. After stopping a
dehumidifier, there is a minimum pause time before restart.
A dew point alarm by dew point monitor always starts
the dehumidifier.
Dehumidifiers are normally used only in cooling mode.
For special applications as e.g. swimming halls dehumidifiers
can be configured also to be operated outside cooling mode.
Relevant parameters
Web page:
Home  Installer  Settings  Devices
App:
Settings  Installer  Devices  Cooling  Dehumidifiers
4.4.5

Summer compensation

To avoid an excessive difference between the outside temperature and
the temperature in cooled rooms, the room temperature set point can
be increased gradually up to a maximum value when a certain outside
temperature is exceed.
This is an option, which can be activated and adjusted by the user.
Relevant parameters
Web page:
not available
App:
Settings  Installer  Control parameter  Cooling  General
26
4.5

Supply control of heat and cool media

This chapter describes how the system controls the supply of heated or
chilled water for heating / cooling surfaces, dehumidifiers and fan coils.
The graph below shows the principle logical order of demand signals.
Starting point is the "energy consumer". This can be e.g. a room
which is heating or a dehumidifier which demands cooling water.
Local Pump
(External supply)
Global pump
Energy supply
Fig. 4-2 Flow of energy demand signals
Not each element which is shown in the graph must be defined in
system configuration.
4.5.1

Manifold selection

Each circuit of a room, the hydraulic connection of a dehumidifier or
the supply of a fan coil is assigned to a specific manifold.
The manifold is assigned to a mixed circuit or to an external source.
4.5.2

Pump control

From functional point of view there are
- Local pumps, controlled by Base or R-Module.
- These pumps are assigned to the rooms, which are controlled by
this Base and his R-Module
- Pumps of mixed circuits, controlled by U-Module
- One global pump, controlled by Base or R-Module
Energy
consumer
Manifold
Mixed Circuit