REHAU NEA Smart 2.0 Control System Owner’s Manual

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NEA SMART 2.0
Control System
Application TABS CCT – sCCT – IFHC
Function – Configuration – Operating

NEA Smart 2.0 Control System

NEA SMART 2.0 Control System
Application TABS
CCT – sCCT – IFHC
Function – Configuration – Operating
Development Status 07/2022 – TABS – Heating applications

Security

Pictograms and logos
Safety instructions are marked with the listed symbols.

| Danger to life due to high voltage.
---|---
| Safety information
| Legal information
| Important information which must be observed
| Configurable parameter

Safety warnings and operating instructions
For your own safety and the safety of other people, please read all safety instructions and operating instructions carefully and completely before commencing assembly.
Keep the operating instructions safe and have them available.
If you have not understood the safety instructions or any individual installation instructions or find them unclear, please contact your REHAU sales office.
Non-compliance with the safety information may lead to damage to property and personal injury.
Product conformity
Hereby, REHAU Industries SE & Co. KG declares that the NEA SMART 2.0 system complies with the following EU directives and UK regulations:
Non-radio equipment types:

• 2014/30/EU; UK: 2016 No. 1091
• 2014/35/EU; UK: 2016 No. 1101
• 2011/65/EU; UK: 2012 No. 3032

Radio equipment types

• 2014/53/EU; UK: 2017 No. 1206
• 2011/65/EU; UK: 2012 No. 3032
  The full text of the EU and UK declarations of conformity is available at the following internet address: www.rehau.com/neasmart2

Radio equipment types:

• Frequency: 869MHz
• Transmission power: max. +12dBm

Use in line with the specification
The NEA SMART 2.0 control system must be configured, installed and operated only as described in this technical information and in the other installation manuals for the system. Any other use is not in accordance with the specification and is therefore not permitted. Observe all national and international routing, installation, accident prevention and safety regulations and the instructions in this technical information when installing piping systems and electrical components and equipment.
Areas of application which are not covered by this technical information (special applications) must be discussed with our application department. Contact your REHAU sales office.

Prerequisites for personnel

• Our systems must only be installed by authorised and trained personnel.
• Only trained and authorised personnel may work on electrical installations or pipework components.

General precautions

• Keep your workplace clean and free of obstructions.
• Ensure that your work space has adequate lighting.
• Keep children, pets and unauthorised persons away from tools and installation areas. This particularly applies to renovations in occupied areas.

Only for UK:
Importer address:
REHAU Ltd.
Hill Court
Walford
Ross-on-Wye
Herefordshire
HR9 5QN
United Kingdom

Introduction

This manual is a supplement to the NEA SMART 2.0 Service Manual for designer, installer and service partner. All information contained in the basic
NEA SMART 2.0 Service Manual have to be considered, too.
This supplement describes the special features and functions of the software extension for the application „Slow reacting radiant heating and cooling systems“, namely CCT, sCCT and IFHC – summarized under the  term TABS.
Used terms:
TABS : Thermally Activated Building Systems
CCT: Concrete core temperation – pipes are embedded in the structural base
sCCT: Surface near CCT – pipes are embedded close to the surface of the structural base
IFHC: Industrial Floor Heating and Cooling
HVAC: Heating, Ventilation, Air Conditioning
Room Unit: All NEA SMART 2.0 Room Controller or NEA SMART 2.0 Room Probes.
The functions for TABS applications in heating mode are available from software version V3.0.
The functions described in this manual which refer to cooling applications are available from April 2023.
You can see the software version on the integrated web pages in menu point “System” and in the mobile app in “Settings”, “General”.
If your system does not have this version, please perform an Over-the-air update.
Please note also
The room units HBW and HRW are available now with software version 1.6 or higher, which is needed for core temperature or return temperature monitoring.
The other room units will follow with these functions.

General function

This chapter describes all special functions for TABS applications.
TABS applications can be combined with all other functions and applications, which are in the scope of NEA SMART 2.0 system.
03.01 What are the special requirements for TABS control?
The most important point is the higher thermal mass of all TABS, compared with floor, wall and ceiling radiant systems.
This high thermal mass could lead to overshooting of room temperature, especially when the system is started or there is a change from reduced to normal mode.
To reduce this problem, it is necessary to monitor the core temperature or – if this is not possible – the return temperature.
In some applications it is also intended to “load” the TABS system CCT e.g. only during the night, while during daytime the HVAC system or other radiant systems take over. In this case, it is also needed to have a well-controlled loading of the core.
Additionally and particularly in the case of commercial buildings – there are often larger areas to be controlled, such as open space offices, halls or showrooms.
For such large spaces it is recommended, to use more than one room unit. See next chapter.
03.02 Room temperature control of larger areas
Larger areas, such as open space offices, industrial halls, exhibition rooms etc. cannot be reliably controlled by means of one single room temperature sensor.
In residential applications, the same situation may occur when there are e.g. large living rooms combined with kitchen and dining areas.
It is beneficial to place room units in different places and use the mean value of all measured temperatures as an input for the control algorithm.
To enable this, the software of the controller allows defining of so-called control areas (CA).
In a CA, there are several room units.
The mean value of all room temperatures and the highest value of relative humidity and dew point is taken for the control algorithm.
These control areas are seen as one room in the app and in the user area of the integrated web pages.
When there are room units with display used, any set point change done on one of the room units is transferred to the other room units.
Note: The use of control areas is not limited to TABS only. A control area may also contain other radiant systems or fan coils, in combination with TABS or without TABS.
A control area is a collection of room units, in order to get average values of room, return or core temperatures and the highest value of relative humidity.
03.03 Consideration of high thermal mass
The control algorithm for TABS consists of two parts:

• A room temperature controller (Proportional-Integral)
• A core temperature controller (Proportional)
  These 2 parts are combined to one control signal, where the 2 parts are weighted with different factors, depending on the TABS type.
  As a consequence, even in the heat up phase when the room temperature is still quite away from its set point,the heating of the core will be reduced, when its set point (according to the design values) is reached. This is done to avoid a significant overshooting of the room temperature.
  On the other hand, when the room temperature is close to the set point (or slightly a bit above), but the core temperature is too low, heating of the core will continue in a moderate way.
  The default setting for the weightíng factors of core and room temperature is 1:1.
  If over longer periods the room temperature is above or below the set point, the weighting factor for room temperature can be increased.

The monitoring of core temperature can be done by

• directly placing a probe in the core or
• by attaching a probe to the return pipe of one of the circuits of the room or CA.

As return or core temperature probes the NEA SMART 2.0 VL/RL sensor (Material number: 13280391001), connected to the external input
“Remote Sensor NTC” of the room unit, are used.
The setting of the external input has to be:
P9 for core temperature measurement
P10 for return temperature measurement
Remark: In case that there is no possibility, to use one of the room units which are placed in the room, for this purpose (no cable to the manifold possible), you have the option to place an additional room unit only for return or core temperature measurement.
The room temperature measurement of this room unit must be disabled, to avoid that the temperature measurement of the room or the CA is distorted.
This is done in the room configuration page in installer level.
03.04 Consideration of design values
By selecting “use design values” during commissioning in the installation wizard only the design values for flow and return temperatures based on an outside temperature of
–15 °C need to be specified. The corresponding heat curves are then automatically determined.
If there is a mixed circuit for TABS controlled by the NEA SMART 2.0 system, this mixed circuit uses automatically the resulting heat curve for flow temperature control.
If there are no design values, it is also possible, to enter the decisive values „slope flow” and “slope return” for the heat curves manually.
03.05 CCT load control: Targeted loading of the core outside of usage times
A special mode of operation for CCT systems is, to load the CCT systems in heating or cooling mode during night-time to a defined temperature level.
The intention behind this method is, to use the installed heating or cooling power during daytime exclusively for other systems as e.g., HVAC or other radiant systems.
03.06 Combination with other radiant systems
It is possible to combine TABS with all other radiant heating / cooling systems as floor, wall or ceiling.
03.07 Dehumidifiers and fan coils
Dehumidifiers and fan coils can be defined for rooms and control areas. A control area is equivalent to a single room, this means that a control area may contain only 1 dehumidifier and only 1 fan coil.

How to design the NEA SMART 2.0 control system

04.01 Definition of control areas (CA)
For areas in excess of 40 or 50 m² it is recommended to place more than 1 room unit to achieve a more reliable measurement of room temperature, humidity and return or core temperature. It makes no sense to define control areas, which include more than one room.
Please note: It is not possible, to assign room units to a CA, which are paired to different NEA SMART 2.0 bases of a master and slave system!
A control area is always limited to only 1 NEA SMART 2.0 base and its R-Module.

04.02 How to monitor core or return temperature
To ensure proper control behavior, return or core temperature probes – one for each room or at least one per CA – should be used.
The auxiliary input of the room units can be used for various signals, for TABS applications it can be defined for return temperature or core temperature.
It is possible, to use both types within a CA.
Every measured core or return temperature is assigned to a dedicated room or control area. If the temperature sensors cannot by physically connected to their corresponding room units, the following alternative solution exists:

• Place a room unit or room probe with software version from 1.6 close to the manifold (e.g. in the manifold cabinet).
• Attach a temperature probe to the return pipe (or place the temperature probe in the core, if possible).
• Enable P9 (Core temperature measurement) or P10 (Return temperature measurement) directly on room unit or in webpage installer settings under menu rooms.
• Disable the room temperature measurement of this room unit in the configuration to exclude the air temperature inside the cabinet or around the manifold from the control input and prevent it from impacting the control process.

Note: The return temperature measurement of a mixed circuit (U-Modul in mixed circuit configuration – analogue input AI2) has no influence on the control behaviour of TABS in heating mode. In cooling mode the flow temperature is adapted when the return temperature drops below the defined limit (see parameter CD).

04.03 How to integrate other systems into TABS
Additional systems as radiant systems, dehumidifiers and fan coils can be integrated in rooms or control areas, which are supplied by TABS.
Please note: A control area needs at least as many room zones (RZ) of a NEA SMART 2.0 base, as room units are combined in the CA.
But: Each RZ which belongs to a CA can be used for a different system.
The next chapter shows different possibilities.
04.04 Examples for TABS applications
04.04.01 1 single room unit with system sCCT (no control area)
1 room unit was assigned to 1 room zone with the system CCT; a return temperature sensor has been configured for the CCT system. An air dehumidifier and/or a fan coil could also be located in this room.

04.04.02 CA (3 Room Units) with CCT, floor and a fan coil
Each room unit is used for a different system (this is not mandatory). 1 return and 1 core probe is used for CCT.

Note: Return and core temperature measurement can be combined.
04.04.03 CA (2 room units) with sCCT, floor and a fan coil
The R-Module is located in a 2 manifold cabinet for underfloor heating, 2 RZs are used for it.
One return temperature probe is used for sCCT.  Note: The assignment of the room units to the room zones with their different function is not important.
The same function could be achieved also with this configuration (RU 2 is assigned to RZ3, too):

Important note: It is not possible to define a CA with room units assigned to different bases. CAs are always limited to one base and the associated R-Module. 04.05 Additional room unit for return/core temperature measurement RU 3 belongs to CA, but is meant for return temperature measurement only. The room temperature measurement is excluded by ticking the checkbox „Exclude Room Temperature“.

04.06 Recommended proceeding to design the system
Installations with several manifolds, with a larger number of rooms, where partly several room units are in one control area, have to be carefully designed and well documented.
It is recommended, to use an excel file, to list all used room units and their relations to rooms, manifolds and systems.
Step 1: Build a reference list of manifolds, systems and rooms
Step 2: Decide where to define a CA
Note: A CA is always limited to only 1 NEA SMART 2.0 base and its R-Module.

Step 3: Place room units in rooms resp. CAs
Step 4: Decide whether additional room units or probes only for return or core temperature measurement – without measuring the room temperature – are needed.
Step 5: Evaluate how many room zones are needed for each single room unit / probe. Here you have to consider the used systems (floor, ceiling, wall, fan coil, CCT, sCCT, IFHC) and the number of heating circuits.
Step 6: Define the required number of base units and corresponding R-modules based on number of CAs and number of room zones and assign NEA SMART 2.0 base units and R-Modules to manifolds and circuits.
Step 7: Assign room units to room zones.

Installation of components

The installation of components is generally done in the same way as described in the NEA SMART 2.0 Service Manual.
05.01 Room units in control areas
When several room units are installed in a room to create a control area (CA), it is important to spread them evenly over the complete control area to get a representative information about the thermal condition of this room.
Temperature differences at certain spots of the control area to the general temperature might occur, but the influence is minimized by averaging.
Note: Observe the general rules for placing room units. See the assembly instructions for the room units.
05.02 Core temperature probes Core temperature probes have to be installed in a protection pipe to avoid direct contact to the concrete and to allow to replace them if defective.
The position of the temperature sensor has to be in the level of the heating pipes inside the construction element and in the middle between 2 pipes at this level.
05.03 Return temperature probes
Return temperature probes should be fixed with good thermal contact to the return pipe. To reduce the disturbing effect of air temperature, place them inside the existing pipe insulation or apply an additional appropriate insulation.
To reduce thermal transmission between manifold and return temperature probe keep a distance of minimum 10 cm to the manifold.
Note: To get representative information about the general return temperature of the area, the circuits of the area must be balanced as designed.

Configuration with wizard

This chapter describes particularly the differences or additional steps, which are used for TABS.
For all other configuration steps or parameter settings, see NEA SMART 2.0 Service Manual.
06.01 Example installation
The example is an installation using sCCT (surface near concrete core temperation) and a radiant floor system for heating, consisting out of:

• 1 office room with sCCT for heating and cooling and underfloor heating.
  This room is equipped with a dehumidifier and a fan coil for cooling

• 1 Bistro with sCCT for heating and cooling and underfloor heating.

• 1 bathroom with underfloor heating only

The NEA SMART 2.0 system controls the flow temperature for sCCT (manifold 1); at manifold 2 there is an external supply for underfloor heating.
The office room has about 150 m², and for this big room a control area is defined with 2 room units. All room units in rooms with sCCT have a core or return temperature probe connected.
Additionally an U-Module is used in mixed circuit configuration for flow temperature control of sCCT. Another U-Module is used in fan coil / dehumidifier configuration.

06.02 Configuration in excel sheet
It is recommended to use for the configuration an excel sheet like this one below.

• Fill the columns from left to right
• Use always the same unique names
• When there are more items of one kind, integrate a number in the name to allow sorting (see manifolds)
  Column 1: Line numbering
  Column 2: The manifolds with their number and supplied system in the name
  Column 3: System
  Column 4: Circuit of manifold
  Column 5: Room name
  Column 6: Numbering of rooms, useful for bigger installations
  Column 7: Marking of control areas
  Column 8: Number of room unit (type of RU is not relevant at this stage)
  Column 9: The room zone (RZ) to which the room unit is assigned
  Column 10: NEA SMART 2.0 Base / R-Module (Master or slave)

1| 2| 3| 4| 5| 6| 7| 8| 9| 10
---|---|---|---|---|---|---|---|---|---
Number in
listing| Manifold| System| Circuitv| Room| Room-
number| CA| Room uni t| RZ| Controller
1| M1_sCCT| sCCT| 1| Office| 1| 1| 1| 1| Master
2| Ml_sCCT| sCCT| 2| Office| 1| 1
1| 1
2| -1| Master
3| M1_sCCT| sCCT| 3| Office| 1| 1| Master
4| Ml_sCCT| sCCT| 4| Office| 1| 1| 2| 1| Master
5| M1_sCCT| sCCT| 5| Bistro| 2| None| 3| 3| Master
6| M1_sCCT| sCCT| 6| Bistro| 2| None| 3| 4| Master
Master R-Module
7| M2_UFH| UFH| 7| Bistro| 2| None| 3| 9
8| M2_UFH| UFH| 2| Bathroom| 3| None| 4| 10| Master R-Module
9| M2_UFH| UFH| 3| Office| 1| 1| 1| 11| Master R-Module
10| M2_UFH| UFH| 4| Office| 1| 1| 1| 11| Master R-Module
11| M2_UFH| UFH| 5| Office| 1| 1| 2| 12| Master R-Module
12| M2_UFH| UFH| 6| Office| 1| I 1| 2| 12| Master R-Module

Some explanations
The manifolds for UFH and sCCT are in the same room, but not at the same place.
So it makes sense to use the Master for sCCT manifold only and R-Module for UFH manifold only (this makes it easier to wire
the actuators):
The R-Module can serve 4 room units, 8 actuators can be connected directly.
In detail: 1 Room Unit to RZ 9 (Bistro)
1 Room Unit to RZ 10 (Bathroom)
2 Room Units to RZ11 and RZ 12 each (Office)
To Master RZ 1 and RZ 2 also 2 actuators can be connected.
→ RU 1 and 2 of office which build CA 1 are assigned to RZ 1, 2 for sCCT and 11 and 12 for UFH
14 06.03 Placement of controllers
Note :
For rooms, which are cooled, room units with humidity sensor are used (in this case office and bistro).
Placement of controllers
Note: For rooms, which are cooled, room units with humidity sensor are used (in this case office and bistro).

06.04
Wizard sequence
06.04.01 System type
For systems with TABS you always have to choose the type “Complex”.

06.04.02 System components
In this page, there is the new possibility to define the number of control areas:

Please note: You have to enter the number of room units, not the number of rooms!
06.04.03 TABS settings After you have selected one of the TABS-types you have to parametrize this system in the next screen:

When the option “Use design values” is selected, the flow temperature and the return temperature at an outside temperature of –15 °C must be entered.
Note:
Usually these two parameters are part of the design planning of the building and can be inserted in the TABS settings menu.
The system uses these two values to calculate the heat curves for flow and return temperature.
The other option is to enter the slope values manually:

06.04.04 System Bus Scan
System Bus Scan shows Base, R-Module and the 2 U-Modules.

06.04.05 Definition of U-Modules

06.04.06 U-Module for mixed circuit (sCCT)

06.04.07 Type of Mixed circuit, manifolds

Note: Manifold #2 is supplied by an external source
06.04.08 Dehumidifier, Fan Coil Combined usage:
Fan coil uses relay 1
Dehumidifier (only compressor) relay 2
Dehumidifier is supplied by manifold 1
06.04.09 Assignment to Control Area (CA)

When “Configure” is selected, the new page for CA opens (if there are CAs defined):

On the page „system components“ it has been configured that there is only 1 CA.

The 1st room unit is paired to room zone 1 and 11, its main room zone is 1.
The 2 nd room unit is paired to room zone 2 and 12, its main room zone is 2.
The 3 room unit Disp TH RC is paired to room zones 3 ,4 and 9, its main room zone is 3.
The 4 room unit (probe T BUS) is paired to room zone 10.
The room units paired to main room zone 1 and 2 are combined in CA-1.
06.04.10 Definition of Room Zones

The sCCT system is supplied by manifold 1 and used for heating and cooling.
The floor system is supplied by manifold 2 and is used for heating only.
The 3 rd column shows the assignment of Main room zones to CA.
06.04.11 Digital Inputs / Outputs

The input „Cooling“ is used to switch the system to cooling mode.
06.04.12 Finalization of Wizard

The 2 checkboxes “Enable automatic mode heat/cool” and “Heat/Cool remote switching“ allow, that the system is switched from heating to cooling by the input “Cooling (CO)”.
Please note: The system must be set to Automatic mode.

Configurations and Settings in Installer level (Web Pages)

07.01 Configuration of Room Units
After completing of wizard the installer menu appears.

From installer menu the configuration of room units can begin:

The room units still have the name of the base unit (in this case Master) combined with the main room zone.
Master – 1 is the 1 st room unit of CA-1. The dehumidifier and fan coil for cooling will be assigned to it.
Note: This is done only for the 1 st room unit of CA-1. The 2 nd room unit shows automatically the same assignment.

The external probe is configured as P10 (return temperature probe). The measured value of 21.7 °C is only displayed when this page is re-entered. The room unit is configured for heating and cooling. Master – 2 is the 2 room unit of CA-1.
The dehumidifier and fan coil for cooling are shown as they were defined for Master – 1. nd

The external probe is configured as P9 (core temperature probe), the measured value of 21.7 °C is only displayed when this page is re-entered.
Master – 3 is the only room unit in the room „BISTRO“.

The external probe is defined as return temperature probe (P10).
The room is configured for heating and cooling.
The room unit Master – 10 is for a room with underfloor heating only.

There is no external probe connected (P0).
07.02 Settings in installer menu
Installer main menu

From installer main menu the menu point „Settings“ can be chosen:
**Settings
Heating/Cooling settings
Mixed circuits
Devices
Functions
Control settings
Fancoil Settings
Dehumidifier settings
TABS Settings
Resel parameters to default**

07.02.01 Tabs Settings
This is exactly the same page, which is in the wizard for initial setting.
If TABS causes during operation an oversupply or undersupply with effect on the room temperature, the TABS parameters can manually be adjusted in
TABS settings.
The most reliable and recommended method is, to modify the design values in small steps:

• Heat Curve Starting Point Normal Mode
• Flow temp at –15 °C
• Return temp at –15 °C

Furthermore, the balancing of room and core part is also possible:

• Weight Room temperature
• Weight Core temperature

07.02.02 Mixed circuit
When the system uses one (or up to 3) mixed circuits, the “Settings” menu contains the menu point “Mixed circuits”.
A mixed circuit for TABS takes the following parameter settings from the TABS settings menu:

1. Heat curve starting point in normal mode
2. Heat curve slope (flow) in normal mode

The parameters

• Heat curve starting point in absence mode
• Heat curve slope in absence mode are calculated out of parameters 1) and 2).
  Note: These values cannot be modified.

07.02.03 Control settings
Control settings are the settings for room temperature control. Only settings for systems, which have been configured in WIZARD, are shown.
The type of parameters is the same as for other radiant systems, but the values (min. / max. / default) are adapted to TABS.

Because of the higher thermal mass of sCCT the marked parameters are adapted to higher values.
07.02.04 CCT Load control
In chapter 3.5 the strategy of loading the core of a CCT system is described.
The menu shown below controls this method: For each part of the installation, which is supplied with CCT, one of the weekly programs is selected to use this strategy for heating or cooling or both modes.

In the not active time span of the weekly program, the following options are possible:

• Stop operating of the CCT completely
• Reduce the heating or cooling power by the entered percentage

Operating by User

08.01 User Level of Web Pages
The user level of web pages is not different to installations with other radiant systems.
The control area 1 appears as one room, named now Master – 1 (which is the name of the 1 st room unit of CA 1).

In our example, the user may change the room names:

08.02 Room units
Any change of settings which is done at one of the room units, which belongs to a control area, is mirrored to the other room units of this control area.
08.03 Operating by Mobile App
The operating of the system is not different to installations without TABS.

Parameters relevant for TABS

09.01 TABS settings
The parameters shown here are for 4-CCT, 5-sCCT, 6-IFHC.
To find in App: Home → More → Settings → Installer → Control Parameters → TABS Settings

Key| | Min| Max| Base
value| Unit
---|---|---|---|---|---
Text in parameter menu| Comment
BKT1 oBKT1 IFHC1| Elestrt Values| Value is 1 when design values are usea. In this case the flow and return temperature at an outside temperature of -15 °C are entered and the system uses the calculated heat curves for flow and return or core temperature.| | | |
BKT2 oBKT2 IFHC2| Weight of room temperature| Factor which defines the influence of room temperature for the control algorithm for TABS.| 1| 10| 4:1
5:1
6:1| –
BKT3 oBKT3 IFHC3| Weight of core temperature| Factor which defines the influence of core temperature for the control algorithm for TABS.| 1| 10| 4:1
5:1
6:1| ° C
BKT4 oBKT4 IFHC4| Heat Curve Starting
Point Normal Mode| The heat curve starts at this point; the value for the flow temperature is equal to the outside temperature here. Valid for normal mode (not absence mode).| 1| 30| 4:21
5:21
6:21| °C
BKT5 oBKT5 IFHC5| Core temperature cooling| Target value for core temperature in cooling mode.| 15| 25| 4:20
5:20
6:20| °C
BKT6 oBKT6 IFHC6| Core temperature Absence| Target value for core temperature in heating mode, when system is in absence mode.| 10| 25| 4:18
5:18
6:18| °C
BKT7 oBKT7 IFHC7| Core temperature Minimum| Minimum value of core temperature.| 10| 25| 4:16
5:16
6:16| °C
BKT8 oBKT8 IFHC8| Core temperature maximum| Maximum value of core temperature.| 20| 40| 4:30
5:30
6:30| °C
BKT9 oBKT9 IFHC9| Flow temperature at -15 °C| When design values are used, this value is entered for flow temperature at -15 °C.| 10| 40| 4:32
5:32 6:32| °C
BKT10 oBKT10 IFHC10| Slope of flow Tempe- rature| When design values are used, this value is calcu- lated. When design values are not used, this value has to be entered.| 0| 1| 4:0,36
5:0.36
6:0,36| –
BKT11 oBKT11 IFHC11| Return temperature at -15 °C| When design values are used, this value is entered for return temperature at -15 °C.| 10| 40| 4:28
5:28
6:28| °C
BKT12 oBKT12 IFHC12| Slope return tempera- ture| When design values are used, this value is calcu- lated. When design values are not used, this value has to be entered.| 0| 1| 4:0,26
5:0.26
6:0.26| –
BKT15 oBKT15 IFHC15| Safety distance of core to dew point tempera- ture| Cooling of the radiant element is stopped when the core temperature drops below dew point plus safety distance.| 0| 10| 4:2
5:2
6:2| K

09.02 Mixed circuits
09.02.01 Heating circuits
The parameters are used as default values if a mixed circuit is specified during the configuration of the system.
During the start-up, a parameter set is created for each heating circuit in line with the utilisation of the heating circuit (floor/ wall, ceiling, CCT, sCCT, IFHC).
The parameters shown here are for 4-CCT, 5-sCCT, 6-IFHC.
The parameters in the gray table cells are only displayed and cannot be changed in this menu.
To find in App: Home → More → Settings → Installer → Control Parameters → Heating → Heating Circuits

Key| Text in parameter menu| Comment| Min| Max| Base
value| Unit
---|---|---|---|---|---|---
MIXH01| Heat curve starting
point normal mode| The heat curve starts at this point; the value for the flow temperature is equal to the outside temperature here. Valid for normal mode (not absence mode).| 10| 40| 4:21
5:21
6:21| ° C
MIXH02| Heat curve starting point absence mode| Like MIXH01, but for absence mode.| 10| 40| 4:16
5:16 6:16| ° C
MIXH03| Heat curve slope in normal mode| Defines the slope of the heating curve. Valid for normal mode (not absence mode).| 0| 1| 4:0.28
5:0.28
6:0.28| –
MIXH04| Heat curve slope in absence mode| Like MIXH03, but for absence mode.| 0| 1| 4:0.16
5:0.16
6:0.16| –
MIXHOS| Minimum value of supply temperature in heating mode (normal)| Minimum value for flow temperature at start of heating mode, independent from heat curve func- tion. Valid for normal mode (not absence mode).| 15| 40| 4:22
5:22
6:22| °C
MIXH06| Minimum value of supply temperature in heating mode (absence)| Like MIXH05, but for absence mode.| 15| 40| 4:20
5:20
6:20| °C
MIXH07| Maximum value of supply temperature in heating mode (normal)| Maximum limit for flow temperature at very low outside temperatures. independent from heating curve function. Valid for normal mode (not absence mode).| 20| 40| 4:35
5:35
6:35| °C
MIXH08| Maximum value of supply temperature in heating mode (absence)| Like MIXHOZ but in absence mode.| 20| 40| 4:35
5:35
6:35| °C
MIXH09| Filter time for outside temperature| For start and end of heating mode and for the calculation of flow temperature not the actual value of outside temperature, but the timely filtered value is used.| 0| 99| 4:48
5:48
6:48| h
MIXH11| Flow temp. reduction in reduced mode| In reduced mode (economy mode) the flow temperature is reduced by this value.| 0| 10| 4:4
5:4
6:4| K
MIXH12| Compensation factor for room temperature| Influence of the deviation between set point and actual value of room temperatures on flow temperature.| 0| 5| 4:0
5:0 6 0|

09.02.02 Cooling circuits
The parameters are used as default values if a mixed circuit is specified during the configuration of the system.
During the start-up, a parameter set is created for each cooling circuit in line with the utilisation of the heating circuit (floor/wall, ceiling, CCT, sCCT, IFHC)
The parameters shown here are for 4-CCT, 5-sCCT, 6-IFHC.
To find in App: Home → More → Settings → Installer → Control Parameters → Cooling → Cooling Circuits

Key| Text in parameter menu| Comment| Min| Max| Base
value| Unit
---|---|---|---|---|---|---
CAn| Minimum value supply| Minimum value of flow temperature in normal| 8| 25| 4:16| ° C
| temperature in cooling| mode (not reduced mode).| | | 5:16|
| mode (normal)| | | | 6:16|
CBn| Flow temperature:| The flow temperature always has this safety| 1| 10| 4:02| ° C
| safety distance to| distance to the worst (highest) value of the dew| | | 5:02|
| dew point| point temperature.| | | 6:02|
CCn| Element temperature| The temperature of cooled elements must not be| 15| 25| 4:20| ° C
| limit in cooling mode| below this value in cooling mode.| | | 5:20|
| | | | | 6:20|
CDn| Return temperature| The return temperature must not be below this| 15| 25| 4:18| °C
| limit in cooling mode| value in cooling mode.| | | 5:18|
| | | | | 6:18|
CEn| Increase cooling flow| In reduced mode (energy saving mode) the flow| 0| 10| 4:01| K
| temperature in| temperature is increased by this value.| | | 5:01|
| reduced mode| | | | 6:01|

09.03 Control settings
The parameters define the behavior of the room temperature control for TABS.
The parameters shown here are for 4-CCT, 5-sCCT, 6-IFHC.
To find in App: Home → More → Settings → Installer → Control Parameters → Cooling → Room Temperature Control

Key| .
Text in parameter
menu| | Max| Base
value| Unit
---|---|---|---|---|---
Comment| .,….., Mm
R01| Proportional bandwidth heating mode| Proportional band of room temperature control in heating mode. The proportional band affects the immediate reaction to temperature change. The bigger the band, the weaker the reaction.| 0| 10| 4:4
5:4
6:4| K
R02| Proportional
Propoional bandwidth cooling mode| Like R01, but for cooling mode| 0| 10| 4:4
5:4
6:4| K
R03| Pulse period time room temperature control| Time period of the pulse width modulation signal used for room temperature control.| 30| 360| 4:80
5:60
6:80| min
R04| Minimum pulse length room temperature control| Pulses below this value will be restrained.| 20| 60| 4:25
5:20
6:25| min
R05| Integral time room temperature control| Integral time in minutes of controller in heating- and cooling mode. Affects the reaction to perma- rent deviation to the set point. The longer the time, the slower the reaction. 0 means OFF.| 0| 600| 4:180
5:120
6:180| min
R06| Integral (part limitation)| Limitation of integral part in control signal in %.| 0| 100| 4:30
5:30
6:30| %
R07| Optimisation room temperature control| Level of room temperature control optimisation.| 0| 10| 4:5
5:5
6:5| –
R08| Pulse length threshold (for continous mode)| Pulses with a length above this limit (percentage of pulse width period) result in a permanent acti- vation of drives (continuous signal).| 50| 100| 4:80
5:80
6:80| %
R09| Shift of proportional band| Defines the middle position of p-band. 0 % means symmetrical to set point.
Can be reduced to —25 % or more in case of well-adjusted flow temperatures and
well insulated buildings.| -50| …
50| 4:0
5:0
6:0| %

Hints for optimization

been chosen, adapt heat curve or return temperature curve in TABS settings (slope). If the option “use design values” has been chosen, check and reduce setting for flow and return temperature at —15 °C.
2| | Core temperature is time wise too high (return temperature measurement is not correctly measured)| Check placement and thermal contact of return temperature probe(s).
3| Room temperature is too high or too low| Core temperature is too high or too low (settings are not well adapted)| Check settings in TABS (see Nr.1 and 2).
4| | Core temperature is too high or too low (information about outside temperature is not correct)| Check outside probe or setting of position of installation (weather information might be incorrect).
5| | The balance between TABS and an additi- onal system as e.g. floor heating is not correct| Check TABS settings (see Nr.1 and 2) and settings of other system.
6| | |
7| | |

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This shall also apply for all warranty claims, with the warranty applying to the consistent quality of our products in accordance with our specifications.
Subject to technical changes. www.rehau.uk

© REHAU Industries SE & Co. KG
Rheniumhaus
95111 Rehau
954663 EN 06.2022

References

• Conditions of Sale worldwide | REHAU
• NEA SMART 2.0 Manager | REHAU
• REHAU TI Portal - Find specific technical information
• REHAU - Engineering Progress, Enhancing Lives

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