Rehau NEA SMART 2.0 User manual

End user manual
The new generation of thermostats –
NEA SMART 2.0

Content
This user manual for the “NEA SMART 2.0 control
system” is valid from January 2021.
This document is protected by copyright. The rights
conferred therein are reserved, in particular those
relating to the translation, reprinting, extraction of
pictures, electronic transmissions, reproduction by
photo-mechanical or similar means and storage on
data processing equipment.
All dimensions and weights are approximate.
Subject to errors and modifications.
End user manual
04 Information and safety instructions
05 Introduction
10 Operation via the Room unit
14 Displays on the Base, R- and U-Module
16 Operation via integrated web pages
19 Usage of the integrated web pages
23 Usage of the NEA SMART 2.0 App
30 Battery (battery-operated thermostat only)
31 Error description
32 Technical data NEA SMART 2.0

Enhancing lives

01 Information and safety instructions
Information on the Internet
Your benefits
Authorised personnel
The electrical installation must comply with the appli-
cable national regulations and the regulations of the
local power supplier.
This manual requires special knowledge corresponding
to an oicially recognised qualification in one of the
following professions:
▪Electrical or electronics engineer
In accordance with the international regulations as
well as the comparable professions within your
specific national legal framework.
Cleaning
Only use a dry, solvent-free, soft cloth for cleaning.
Disposal
The batteries and all comonents of the
NEA SMART 2.0 system must not be disposed with
domestic waste. The user has the duty to dispose of
the devices at designated collection points. The sepa-
rate collection and orderly disposal of all materials will
help to conserve natural resources and ensure recy-
cling in a manner that protects human health and the
environment. If you need information about collection
points for your devices, please contact your local
council or your local waste disposal services.
Parameter setting – Expert
The control unit is equipped with dierent parameters.
These parameters can be easily changed for your
specific application.
Please note that the parameter areas may only be
operated by an installer or a qualified person.
Changing the parameters can have serious conse-
quences for the heating system.
Please enter all parameter changes in the “installer’s
notes” section.
Product conformity and safety
Product conformity
This product fulfils the requirements of the following
EC guidelines:
▪Electromagnetic compatibility 2014/30/EU
▪Low-voltage directive 2014/35/EU
The complete CE certificates can be downloaded from
the website www.rehau.com/neasmart2.
Safety information
Intended use
The NEA SMART 2.0 control system may only be
planned, installed and operated as described in these
instructions and in the other documents belonging to
this system. Any other use is not intended and there-
fore inadmissible.
Observe all national and international installation, acci-
dent prevention and safety regulations when installing
piping systems and electrical equipment as well as
observe the information in this manual.
Areas of application that are not covered in these
instructions (special applications) require consultation
with our application technology department.
Contact your REHAU sales oice.
Our systems have to be installed by authorized and
trained persons, and work on electrical systems or
parts of cables only by trained and authorized persons.
Pictograms and logos
Warnings and general information are marked with the
symbols listed below.
Danger to life due to high voltage.
Safety notice
Legal notice
Important information which must be
observed
04 End user manual

02 Introduction
Congratulations on the purchase of the REHAU
NEA SMART 2.0 control system. We are pleased that
you have chosen a control system from REHAU. We
hope that you enjoy your product.
Application area
NEA SMART 2.0 is a modern and eective control
system for underfloor heating and cooling systems
with a wide range of functions.
Important features include:
▪clear and high-quality design of room units
▪fully automated control of the entire system
▪with LAN/wireless LAN interface for operation using
a web browser or an app as standard
▪smart functions, which ensure a high level of
comfort and ensure eective operation
▪suitable for new installations and retrofitting
System structure
1NEA SMART . Base
▪Central control unit for 
rooms
▪
Hybrid technology: suitable
for bus and wireless Room
units/Room probes
▪
LAN/wireless LAN featured
as standard
2NEA SMART .
Room units/Room probes
▪High-quality design
▪
LED matrix display
▪
Bus and wireless variant
3APP
▪Configuration via smart-
phone/tablet
▪
Operation worldwide
▪
Remote maintenance and
monitoring
Fig. 02-1 NEA SMART 2.0 system (not all components of the system are shown)
1
2
3
End user manual 05

Functions and operation
What can the NEA SMART 2.0 system do?
The basic function of the system is to heat the rooms
conveniently and economically according to your
wishes.
Depending on the installed system, however, many
other functions are available:
▪Room cooling via combined heating/cooling areas
▪Automatic or manual switching between heating,
neutral and cooling
▪Controlling the optimum temperature for the supply
of the heating/cooling areas (“flow temperature
control”)
▪Dehumidification of rooms
Using the thermostat or via the app, the target
temperatures for heating and cooling respectively can
be switched between comfort (normal mode) and eco
(reduced mode) temperature.
How can I operate the system?
You can operate the system
▪directly via the room unit (setting the desired
temperature, changing the operating mode)
▪via the browser of your smartphone, tablet or PC
(integrated web pages can only be used inside your
home)
▪via the cloud using the NEA SMART 2.0 app
What can I do?
Via room unit Web pages (local) App (via cloud)
Read room temperature, read and set the desired temperature
Select the operating mode “timer programme”, “normal” or “reduced”
Set timer programmes and assign them to rooms
Assign room names
Set desired temperatures for the rooms according to the timer
programme
Select heating mode or cooling mode
Use holiday function
Automatic reduction of energy consumption during absence
(geo-fencing)
View temperature profiles of rooms
For dehumidifier control:
Change the switch-on values
Automatically reduce energy consumption during absence
Receive information on system optimisation
Receive maintenance information
The NEA SMART 2.0 app is easy and convenient to
use, and oers many features that make the system a
truly smart system.
What can be set or viewed?
Depending on the options installed in the system,
there is a wide range of possibilities for setting room
temperatures on-site or on the go, adapting the
system to your needs, viewing statistics or receiving
information.
The table 02-1 provides you with an overview of the
dierent options.
Please note that for operation via the app (cloud
connection), it does not matter where you are, whilst
operation via the integrated web pages only works
within your home.
Tab. 02-1 NEA SMART 2.0 possible settings
06 End user manual

All system components:
Room unit
The room unit operates the room temperature and
humidity sensor as well as an operating unit for the
room temperature specification. The room unit is fitted
with a LED matrix display and is fixed to the wall in
every room. The thermostat is operated via a central
button and plus/minus buttons. In addition, the room
unit can be operated via the app.
Variants:
▪Bus or wireless technology
▪With temperature or temperature/humidity sensor
▪Housing colour: black or white
Room probe
The room probe serves as a room temperature and
humidity sensor. It can be fixed to the wall in any room,
particularly in rooms where direct temperature adjust-
ment is not required. The room probe can be operated
using the app.
Variants:
▪Bus or wireless technology
▪With temperature or temperature/humidity sensor
▪Housing colour: white
Base 24 V / 230 V
The base is a central control unit for underfloor heating
and cooling systems and is normally located in the
heating circuit manifold box. Up to 8 room control units
can be connected to the base via bus or wireless tech-
nology.
Transformer
The transformer powers the base 24 V and is normally
positioned in the heating circuit manifold box.
R-Module 24 V / 230 V
The R-Module is used to extend the base by 4 rooms. It
is usually located in the heating circuit manifold box.
End user manual 07

U-Module 24 V
The U-Module 24 V is a universal extension module for
the base. Depending on the configuration, it can be
used to control the flow temperature, actuate up to 2
dehumidifiers or actuate an extraction fan as required.
Remote sensor
The temperature sensor is connected to the room unit
and can be configured for floor temperature moni-
toring in heating and cooling applications or for meas-
uring room temperature.
Flow/return sensor
Temperature sensor is connected to the
NEA SMART 2.0 U-Module to measure the flow and
return temperature of a mixed heating circuit.
Outdoor sensor
The wireless outdoor sensor measures the external
temperature and is located on an outer wall of the
building. The outdoor sensor is assigned to a
NEA SMART 2.0 Base.
Antenna
The antenna serves as an option to increase the range
of the wireless signal to the room units. The antenna is
connected to the base and is installed outside the
heating circuit manifold box.
KNX Gateway
The KNX gateway enables data transmission from the
NEA SMART 2.0 control technology to a KNX system.
Values such as: setpoints, actual values, operating
modes and energy levels can be exchanged with a
higher-level KNX system such as a BMS.
08 End user manual

Power supply Gateway
The power supply of the gateway is used to generate
the auxiliary voltage for the Modbus of the
NEA SMART 2.0 KNX gateway.
Coupling Relais 24 V / 230 V
The coupling relay is used to transfer 24 V / 230 V AC
switching signals to the digital inputs of the
NEA SMART 2.0 control system.
Switching Relais 24 V / 230 V
The switching relay is used to connect to triac outputs
or relay outputs of the NEA SMART 2.0 24 V / 230 V
control system and to control external devices, addi-
tional actuators or to forward signals to other building
technology units.
NEA SMART 2.0 Bus cable (10/50 m bundle)
The NEA SMART 2.0 Bus cable can be used to wire the
system bus and zone bus of the NEA SMART 2.0
control system.
End user manual 09

03 Operation via the Room unit
The display is switched o when in hibernation mode.
It is activated by pressing the Home button. Only then
the plus/minus symbols become visible.
Flashing symbols or numbers can be modified.
HOME button
▪Activate display
▪Next menu item
▪Confirm
MINUS SYMBOL
▪Reduce the desired temperature
▪Previous menu item
PLUS SYMBOL
▪Increase the desired temperature
▪Next menu item
Display information
Fig. 03-1 NEA SMART 2.0 Room unit
The Room unit is operated using the Home button and the +/-
symbols.
10 End user manual

Display of temperature
Shows the current room temperature or
the desired room temperature.
Display of room humidity
Shows the relative humidity in the
room.*
Display of the operating mode
Heating mode
Heating mode is active
Cooling mode*
Cooling mode is active
Operating status
Standby
Heating and cooling mode disabled
Timer programme
Room is controlled via the timer
programme
When the symbol for timer programme is displayed,
the set operating status is displayed afterwards
(Normal or Reduced).
Manual
User has changed the desired tempera-
ture; valid until the next switching point.
Normal
Operating mode Normal is active
Reduced
Operating mode Reduced is active
(energy-saving mode)
Transitional phase Normal
Transitional phase Normal to Reduced
operating mode
* Is displayed if this function can be activated or if a sensor is integrated.
Transitional phase Reduced
Transitional phase Reduced to Normal
operating mode
Party
Party mode is active
Holiday
Holiday mode is active
Room unit locked
Buttons are locked
Error message
Warning message
Low battery
The battery of the Room unit must be
replaced.
Window open
An open window has been detected in
this room.
Condensation
High humidity – risk of condensation
Frost protection active
Frost protection has been activated as
the temperature has fallen below 5 °C;
the heating valve is activated.
Connection status
No connection
There is no connection to the Base.
End user manual 11

Order of the displayed information
3
4
1
2
5
1Initial state
2Display of current room temperature
3Display of current humidity in the room
4Display of operating mode
Heating or cooling
5Display of operating status
Setting the desired temperature
To activate the display, press the Home button once.
To see the target value, press +/- once.
3s /
*
1
2
3
4
5
6
+
+/-
1Initial state
2Display of current room temperature
3Display of the setpoint of the room temperature
4Display of the setpoint of the room temperature
during operation
5Display of the final setpoint for the room tempera-
ture
6Display of current room temperature
* optional: If the Room unit has a light ring, it flashes additionally
for confirmation.
12 End user manual

Operating status
The current operating status is displayed after
pressing the Home button 4 times. It can be changed
by pressing +/-. The current operating status is always
displayed first. This means that the order can deviate
from the image.
1Normal mode
Standard desired temperature 22 °C
2Reduced mode
Standard desired temperature 18 °C
3Standby mode
Heating and cooling mode disabled
4Automatic mode
The selected timer programme for the room is
active
5Party
Party mode is activated for 4 hours.
The party mode allows the user to switch from the
reduced operating mode to the normal operating mode
for a period of time. The thermostat automatically
returns to the reduced operating mode when the party
time has elapsed.
3s /
3s
4
5
2
3
1
When standby mode is selected, automatic frost
protection is active. As soon as the temperature drops
below 5 °C, the heating valve is activated.
The following applies only to holiday mode:
Vacation mode can only be activated with the app or
website. The vacation symbol only appears on the
display when holiday mode is active.
End user manual 13

04 Displays on the Base, R- and U-Module
NEA SMART 2.0 Base 24 V / 230 V
Fig. 04-1 NEA SMART 2.0 Base 24 V / 230 V – labelling LED display
1243 5 6107 9
8
12 11
1Green: everything OK
Red: Fuse defective or external supply voltage not
present (L1/L2)
2Freely configurable potential-free contacts
Green: active
3Display of rooms/zones 1–8
Green: active
4Button on the left
5Confirmation button
6Button on the right
7Display of rooms/zones 9–12 of the R-Module
Green: active
8Blue: Cooling mode active
9Green: shows communication with Room units bus
or R-Module
10 Green: shows communication with slaves and
U-Module
11 WIFI/LAN status display
(see installation instructions for base))
12 Digital input (window contact, dew point monitor ...)
Green: active
14 End user manual

NEA SMART 2.0 R-Module 24 V / 230 V
Fig. 04-2 NEA SMART R-Module 24 V / 230 V – labelling LED display
123 4 5
NEA SMART 2.0 U-Module 24 V
Fig. 04-3 NEA SMART 2.0 U-Module 24 V – labelling LED display
123
4
U-Module 24 V
1Green: shows communication with Base
2Freely configurable potential-free contacts
Green: active
3Digital input (window contact, dew point monitor ...)
Green: active
4Display of rooms/zones 9–12
Green: active
5Green: everything OK
Red Fuse defective or external supply voltage not
present (L1/L2)
1Freely configurable potential-free contacts
Green: active
2Digital input (window contact, dew point monitor ...)
Green: active
3Green: Operating voltage OK
4Green: shows communication with master
End user manual 15

05 Operation via integrated web pages
The integrated web pages can be used as an alterna-
tive to the NEA SMART 2.0 app via the browser of a
smartphone, tablet or PC.
The IP address of the device is 192.168.0.2.
Via the web pages, you can:
▪Assign names to the rooms and set the desired
temperatures
▪Create timer programmes for the desired tempera-
tures and assign them to the rooms
▪Select the operating modes “normal mode”’ and
“reduced mode” for all rooms or individual rooms
▪Use the holiday function
▪Switch between heating mode and cooling mode
To use the web pages, a direct connection must be
established between the device (smartphone, tablet,
PC) and the NEA SMART 2.0 Base. The web pages can
only be accessed with one device at a time.
It is not possible to use the app and the integrated
web pages at the same time.
Setting up the base for using the web pages
For systems in which there is more than one base,
communication always takes place via the “master”
Base. Ask your installer which Base has been estab-
lished as the master.
Activating communication
When the system is delivered, the communication
functions of the base station via wireless LAN and LAN
are switched o.
The NEA SMART 2.0 Base may only be handled if the
cover is in place on the NEA SMART 2.0 Base. If this is
not the case, the installer has to be called.
1
Press both arrow buttons at the same time
for > 3 seconds
The WIFI/LAN LED and/or the AP LED will begin to
flash.
Confirm by briefly pressing the OK button. The current
status of the transmitting function is displayed.
OK ><
> 3 sec
RZ12 COOL ZBUS1
DI4 WIFI/LAN
RZ11
DI3 AP
WIFI/LAN AP
WIFI/LAN AP
WIFI/LAN AP
WIFI and LAN o
Cloud Mode
Access Point Mode
16 End user manual

2
By briefly pressing the right arrow button, it is possible
to switch between the transmitting functions (none,
direct connection, server connection). Press the right
button repeatedly until the direct connection is acti-
vated. In this case, the WIFI/LAN LED flashes and the
AP LED lights up permanently.
3
Confirm by briefly pressing the OK button.
If no buttons are pressed for a certain time, the NEA
SMART 2.0 Base will return to the initial state.
In this case, the sequence for activating the transmit-
ting function can be started again with step 2.
The NEA SMART 2.0 Base is now ready for direct
connection to a PC or a tablet/smartphone.
With the transmitting function activated, the wireless
LAN network transmitted by the NEA SMART 2.0 Base
is visible to every user – similar to the wireless LAN
network of a router. It is recommended to change the
default password during the initial set-up.
If the password has been forgotten, it can be reset to
the delivery status.
APWIFI/LAN
OK ><
< 1 sec
Establishing a connection between the Base and the
PC/tablet/smartphone
Before performing the following steps, the transmit-
ting function on the NEA SMART 2.0 Base must be
switched on.
1
On the PC/tablet/smartphone, open
the wireless LAN menu and view the
available networks. NOTE: The distance
between the PC/tablet/smartphone should
not exceed approx. 5 m.
2
Select the wireless LAN network with
the name “REHAU-xxxxxx”.
End user manual 17

3
After selecting the REHAU network, the security key
needs to be entered. The security key (default Wi-Fi
WPA2 key) can be found on the label of the base
station.
After a few seconds, the PC/tablet/smartphone
connects to the base station.
4
Open the Internet browser on a PC/smartphone/tablet
(e.g. Chrome, Firefox, Edge, ...) and enter the IP address
http://192.168.0.2 in the address bar.
The home page of the integrated web pages opens.
The successful connection is displayed on the base
station. Both the WIFI/LAN LED and the AP LED are
permanently lit.
********
Password:
Default WIFI WPA2 Key
APWIFI/LAN
18 End user manual

06 Usage of the integrated web pages
Depending on the type of system, the integrated web
pages oer the following options:
▪Selection of the operating modes of the system:
▪Heating/cooling:
▪via time programme or continuously in normal,
reduced or standby mode
▪Managing the time programmes
▪Specification and management of room tempera-
ture
▪Using the party or holiday function
▪Specification of the mode of operation of the dehu-
midifiers
▪Connecting the system to the Internet to use the
app
▪Additional setting options
Main menu:
Fig. 06-1 Web page: Main menu
In the main menu, you can see the current operating
mode – shown here: Heating mode and “normal” mode
(person in the house).
By clicking the symbols, the dierent operating modes
can be selected (depending on the present conditions):
▪Heating mode, manual
▪Cooling mode, manual
▪Heating mode, automatic start
▪Cooling mode, automatic start
and:
▪Operation via timer programme
▪Permanent “normal” or “reduced” mode
▪System switched o (standby)
In order to ensure comfortable conditions and an ener-
gy-eicient operation, we recommend that you select
the timed operating mode.
Click the menu items to access the respective
submenus.
Room selection:
Fig. 06-2 Web page: Room selection
Here, you can see the individual rooms with their
current room temperatures. Clicking a room takes you
to the individual room pages.
End user manual 19

Room page:
Fig. 06-3 Web page: Room page settings
Here, the current target and actual temperature and
the operating mode (here: heating mode, via time
programme, currently “normal” mode) are displayed.
The room temperature target value can be changed
using the plus and minus symbols.
Note:
▪Changes to the room temperature target value
during timed operating mode are valid until the next
switching point of the time programme
▪Changes during fixed “normal” or “reduced” mode
are set as new standard values for this mode.
By clicking the gear symbol, you can access the
advanced settings.
Extended room page:
Fig. 06-4 Web page: Extended room page settings
The standard values for heating/cooling can be
managed here for “normal” or “reduced” mode as well
as for holiday mode.
There are five weekly programmes available. By
clicking the info symbol, you will see a preview of the
selected timer programme.
20 End user manual