Siemens RDG400KN Operator's manual

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Siemens RDG400KN,RGD405KN Basic documentation CE1P3192en
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s
Room thermostats with KNX communications
RDG400KN,RGD405KN
Basic Documentation
Edition: 3.1
CE1P3192en
2017-02-17 Building Technologies

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Siemens RDG400KN,RGD405KN Basic documentation CE1P3192en
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Contents
1. About this document...........................................................................4
1.1 Revision history .....................................................................................4
1.2 Reference documents............................................................................4
1.3 How to find RDG400KN/RDG405KN applications in HIT ........................5
1.4 Before you start .....................................................................................5
1.4.1 Copyright...............................................................................................5
1.4.2 Quality assurance..................................................................................5
1.4.3 Document use/request to the reader ......................................................5
1.5 Target audience, prerequisites ...............................................................6
1.6 Glossary ................................................................................................6
2. Summary..............................................................................................7
2.1 Types ....................................................................................................7
2.2 Ordering ................................................................................................7
2.3 Functions...............................................................................................7
2.4 Integration via KNX bus .........................................................................9
2.5 Equipment combinations...................................................................... 11
2.6 Accessories .........................................................................................12
3. Functions...........................................................................................13
3.1 Temperature and IAQ control (RDG405KN only) ..................................13
3.1.1 Temperature control.............................................................................13
3.1.2 IAQ control (RDG405KN only) .............................................................14
3.2 Operating modes .................................................................................16
3.2.1 Different ways to influence the operating mode ....................................18
3.2.2 Communication examples....................................................................21
3.3 Room temperature setpoints................................................................25
3.3.1 Description ..........................................................................................25
3.3.2 Setting and readjusting setpoints .........................................................27
3.4 Applications overview ..........................................................................29
3.4.1 Applications with supply and extract air................................................30
3.5 Additional functions..............................................................................31
3.6 Control sequences...............................................................................33
3.6.1 Sequences overview (setting via P01)..................................................33
3.6.2 Hysteresis: Behavior of heating and cooling.........................................34
3.6.3 Application mode .................................................................................35
3.6.4 Minimum and maximum air volume......................................................36
3.6.5 Single-duct applications.......................................................................37
3.6.6 Single-duct applications with electric heater .........................................38
3.6.7 Single-duct applications with radiator or floor heating...........................41
3.6.8 Single-duct applications with heating/cooling coil .................................43
3.6.9 Setpoints and sequences.....................................................................45
3.6.10 Applications with external AQR sensor or QMX room operator unit
(RDG405KN) .......................................................................................46
3.7 Control outputs ....................................................................................47
3.7.1 Overview .............................................................................................47
3.7.2 Control output for air flow.....................................................................47
3.7.3 Control output for electric heater, radiator and heating/ cooling coil ......48

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3.7.4 Control outputs configuration (setting via DIP switches 4 and 5 or tool,
and P46…P47) ....................................................................................50
3.8 Multifunctional input, digital input..........................................................51
3.9 Handling faults.....................................................................................53
3.10 KNX communications...........................................................................53
3.10.1 S-Mode................................................................................................53
3.10.2 LTE-Mode............................................................................................53
3.10.3 Zone addressing in LTE-Mode (in connection with Synco)....................55
3.10.4 Example of heating and cooling demand zone .....................................56
3.10.5 Send heartbeat and receive timeout.....................................................57
3.10.6 Startup.................................................................................................57
3.10.7 Heating and cooling demand................................................................58
3.10.8 Air demand..........................................................................................58
3.10.9 Electric heater interlock by supply air controller (LTE-Mode only).........58
3.10.10 Primary fan overrun after switching off the electric heater.....................59
3.10.11 Fault function on KNX..........................................................................59
3.10.12 Emergency control (LTE-Mode only) ....................................................60
3.10.13 Application with VAV compact controller (KNX LTE-Mode only) ............60
3.11 Communication objects (S-Mode) ........................................................61
3.11.1 Overview .............................................................................................61
3.11.2 Description of communication objects ..................................................62
3.12 Communication objects (LTE-Mode) ....................................................64
3.13 Control parameters..............................................................................65
3.13.1 Parameter setting via local HMI............................................................65
3.13.2 Parameter setting/download via tool.....................................................66
3.13.3 Parameters of the Service level............................................................67
3.13.4 Parameters of the Expert level with diagnostics and test ......................68
4. Handling.............................................................................................70
4.1 Mounting and installation .....................................................................70
4.2 Commissioning....................................................................................71
4.3 Operation.............................................................................................73
4.4 Remote operation ................................................................................75
4.5 Disposal ..............................................................................................75
5. Supported KNX tools.........................................................................75
5.1 ETS.....................................................................................................75
5.1.1 Parameter settings in ETS ...................................................................75
5.2 ACS790...............................................................................................76
5.2.1 Parameter settings in ACS...................................................................76
5.2.2 Operation and monitoring with ACS......................................................77
5.2.3 Operation and monitoring with OZW772...............................................81
6. Connection.........................................................................................81
6.1 Connection terminals ...........................................................................81
6.2 Connection diagrams...........................................................................82
7. Mechanical design.............................................................................82
7.1 General ...............................................................................................82
7.2 Dimensions..........................................................................................83
8. Technical data....................................................................................84

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1. About this document
1.1 Revision history
Edition Date Changes Section Pages
3.1 Feb. 2017 ∂Update “Heartbeat” 3.10.5 57
3.0 Dec. 2015 ∂New features for new product RDG405KN: IAQ
function
Various
2.0 Dec. 2011 ∂Amendments for new software V1.24
∂Various corrections
Various
1.0 July 16, 2010 First edition All
1.2 Reference documents
Subject Ref Doc No. Description
Room thermostats with
KNX communications,
RDG405KN
[18] N3192 Data Sheet
[19] A6V10733816 Operating Instructions
[20] A6V10733804 Mounting Instructions
Room thermostats with
KNX communications,
RDG400KN
[1] CE1N3192 Data Sheet
[2] CE1B3192 Operating Instructions
[3] CE1M3192 Mounting Instructions
KNX Manual [4] Handbook for Home and Building Control – Basic Principles
(www.knx.org/uk/news-press/publications/publications/)
Synco and KNX (see
www.siemens.com/synco
)
[5] CE1N3127 KNX bus, Data Sheet
[6] CE1P3127 Communication via the KNX bus for Synco 700, 900 and
RXB/RXL, Basic Documentation
[7] XLS template
in HIT
Planning and commissioning protocol,
communication Synco 700
[8] CE1N3121 RMB795 central control unit, Data Sheet
[9] CE1Y3110 KNX S-Mode data points
[10] -- Product data for ETS
[11] CE1J3110 ETS product data compatibility list
[12] 0-92168en Synco Application Manual
Desigo
engineering documents
[13] CM1Y9775 Desigo RXB integration – S-Mode
[14] CM1Y9776 Desigo RXB/RXL integration – Individual Addressing
[15] CM1Y9777 Third-party integration
[16] CM1Y9778 Synco integration
[17] CM1Y9779 Working with ETS

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1.3 How to find RDG400KN/RDG405KN
applications in HIT
Select Applications > Individual rooms and set the search criteria as follows:
∂Air Treatment: Type "Variable Air Volume"
∂Preferred controller: Range "RDG / RDF"
1.4 Before you start
1.4.1 Copyright
This document may be duplicated and distributed only with the express permission
of Siemens, and may be passed only to authorized persons or companies with the
required technical knowledge.
1.4.2 Quality assurance
This document was prepared with great care.
∂The contents of this document is checked at regular intervals
∂Any corrections necessary are included in subsequent versions
∂Documents are automatically amended as a consequence of modifications and
corrections to the products described
Please make sure that you are aware of the latest document revision date.
If you find lack of clarity while using this document, or if you have any criticisms or
suggestions, please contact the Product Manager in your nearest branch office.
The addresses of the Siemens Regional Companies are available at
www.buildingtechnologies.siemens.com.
1.4.3 Document use/request to the reader
Before using our products, it is important that you read the documents supplied
with or ordered at the same time as the products (equipment, applications, tools,
etc.) carefully and in full.
We assume that persons using our products and documents are authorized and
trained appropriately and have the technical knowledge required to use our
products as intended.
More information on the products and applications is available:
∂On the intranet (Siemens employees only) at
https://workspace.sbt.siemens.com/content/00001123/default.aspx
∂From the Siemens branch office near you
www.buildingtechnologies.siemens.com or from your system supplier
∂From the support team at headquarters [e-mail] if
there is no local point of contact

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Siemens assumes no liability to the extent allowed under the law for any losses
resulting from a failure to comply with the aforementioned points or for the
improper compliance of the same.
1.5 Target audience, prerequisites
This document assumes that users of the RDG..KNX room thermostats are familiar
with the ETS and/or Synco ACS tools and are able to use them.
It also presupposes that these users are aware of the specific conditions associ-
ated with KNX.
In most countries, specific KNX know-how is conveyed through training centers
certified by the KNX Association (see www.konnex.org/).
For reference documentation, refer to section 1.2.
1.6 Glossary
The inputs, outputs and parameters of an application can be influenced in various
ways. These are identified by the following symbols in this document:
Parameters identified by this symbol are set using the ETS tool.
Parameters identified by this symbol are set using the ACS tool.
Setting RDG..KNX parameters is only supported by the following tool
versions:
– ETS4 or higher
– ACS790
Inputs and outputs identified by this symbol communicate with other KNX devices.
They are called communication objects (CO).
The communication objects of the RDG..KNX room thermostats work partly in
S-Mode, partly in LTE-Mode, and partly in both. These objects are described
accordingly.
A list of the parameters is shown in section 3.12.
ETS
ACS
STOP Note
KNX R

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2. Summary
2.1 Types
Type Features
Operating
voltage Number of control outputs Backlit LCD
On/Off PWM 3-pos DC
0…10 V
VAV
control via
KNX
LTE-Mode
IAQ
RDG400KN AC 24 V 11) 11) 11) 1--- 
RDG405KN AC 24 V 11) 11) 11) 1 
1) Selectable: On/Off, PWM or 3-position (triac outputs)
2.2 Ordering
Order valve actuators separately.
2.3 Functions
VAV systems via On/Off or modulating control outputs or KNX LTE-Mode:
∂Single-duct system
∂Single-duct system with electric heater
∂Single-duct system and radiator/floor heating
∂Single-duct system with heating/cooling coil
The room thermostats are delivered with a fixed set of applications.
The required application is selected and activated during commissioning using one
of the following tools:
∂Synco ACS
∂ETS
∂Local DIP switch and HMI
∂Operating modes: Comfort, Economy (energy saving) and Protection
∂Output for VAV box/air damper/VAV compact controller: DC 0…10 V/3-position
(triac)/KNX LTE-Mode
∂Output for heating/cooling coil: On/Off, PWM or 3-position (triac)/DC 0...10 V
∂Output signal inversion as an option (DC 0...10 V ⇓DC 10...0 V)
∂Automatic or manual heating/cooling changeover
∂Backlit LCD
∂AC 24 V operating voltage
∂Indoor air quality (IAQ) control loop with external CO2/VOC sensor (DC 0...10 V
or KNX LTE- and S-Mode)
∂Window contact (RDG405KN)
∂Presence detector (RDG405KN)
∂Receive temperature via bus (RDG405KN)
∂Selectable DC input (RDG405KN)
Product No. Stock No. Description
RDG400KN S55770-T165 Room thermostat
RDG405KN S55770-T348 Room thermostat
Use
Features

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∂Room temperature control via built-in sensor or external room
temperature/return air temperature sensor or KNX room temperature sensor
∂IAQ control via external CO2/VOC sensor on the DC 0…10 V inputs KNX (LTE-
or S-Mode)
∂Changeover between heating and cooling mode (automatically via local sensor
or bus, or manually)
∂Selection of applications via DIP switches or commissioning tool (ACS790).
∂Selection of operating mode via operating mode button on the thermostat
∂Temporary Comfort mode extension
∂Display of current room temperature or setpoint in °C and/or °F
∂Display of CO2external sensor value in ppm or with symbols (+++; ++-; +--)
(RDG405KN)
∂Display of outside temperature or time of day via KNX bus
∂Minimum and maximum limitation of room temperature setpoint
∂Minimum and maximum limitation of air flow signal DC 0...10 V/3-position
∂External CO2sensor DC 0…10 V; 0…2000 ppm (RDG405KN)
∂External CO2sensor, KNX; 0…5000 ppm (RDG405KN)
∂Button lock (automatic or manual)
∂2 multifunctional inputs, freely selectable for:
– Operating mode switchover contact (keycard, window contact, etc.)
(RDG400KN)
– Window contact switching operating mode to Protection (RDG405KN)
– Presence detector switching operating mode to Comfort (RDG405KN)
– Sensor for automatic heating/cooling changeover
– External room temperature or return air temperature sensor
– Dewpoint sensor
– Electric heater enable
– Fault input
∂Interworking with AQR and QMX sensor for IAQ and room temperature
acquisition (RDG405KN)
∂1 multifunctional active DC input (RDG405KN), freely selectable for:
- External IAQ sensor (CO2, VOC)
- Air damper position feedback (optimization of supply air fan’s operation)
∂Monitoring input for temperature sensor or switch state
∂Feedback of air damper position via KNX bus or a DC 0...10V input for
optimization of pressure control
∂Floor heating temperature limitation
∂Reloading factory settings for commissioning and control parameters
Functions

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2.4 Integration via KNX bus
The RDG.. room thermostats can be integrated as follows:
∂Integration into Synco 700 system via LTE-Mode (easy engineering)
∂Integration into Synco living via group addressing (ETS)
∂Integration into Desigo via group addressing (ETS) or individual addressing
∂Integration into third-party systems via group addressing (ETS)
The following KNX functions are available:
∂Central time program and setpoints, e.g. when using the RMB795 central control
unit
∂Outside temperature or time of day via bus displayed on the thermostat
∂Remote operation and monitoring
∂Remote operation and monitoring with web browser using the OZW772 or
OZW775 web server
∂Maximum energy efficiency due to exchange of relevant energy information, e.g.
with Synco 700 controllers (e.g. heating/cooling demand, air damper position)
∂Alarming, e.g. external fault contact, condensation, etc.
∂Monitoring input for temperature sensor or switch
Engineering and commissioning can be performed using …
– the local DIP switches/HMI
– the Synco ACS tool
– the ETS
The RDG.. room thermostats are especially tailored for integration into the Synco
700 system and operate together in KNX LTE-Mode. This extends the field of use
of Synco for individual room control in connection with fan coil units, VAV, chilled
ceilings and radiators.
Thanks to S-Mode extension to the QAX910 central apartment unit, communicating
room thermostats can be easily integrated into Synco living systems. Using the
S-Mode data points of the central apartment unit, additional room information can
be exchanged with the room thermostat via KNX TP1 (RF function is not available
on the room thermostats). To make the integration, the ETS engineering tool is
required.
Synco 700
Synco living

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Synco 700 Building automation and control system (BACS)
Synco living Room automation and control system
RDG.., RDF.., RDU.. Room thermostats
OZW772 (or OZW775) Web server
QAW.. Room unit
ACS tool Service tool using OCI702 (OCI702) is delivered with a
service cable which can be plugged into the service
connector on a Synco controller)
RXB, RXL Room controllers
QAX Room unit for RXB/RXL room controllers
G..B181..1E/KN VAV compact controller for KNX LTE-Mode
The RDG..KNX devices can be integrated into the Siemens building automation
and control systems (BACS) Desigo or 3rd-party systems. For integration, either S-
Mode (group addressing) or individual addressing can be used. The workflow for
integration into Desigo is the same as with standard KNX devices.
Synco topology
Legend:
Desigo and third-party
systems

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2.5 Equipment combinations
Type of unit Product No. Data
Sheet
Cable temperature sensor QAH11.1 1840
Room temperature sensor QAA32 1747
Condensation monitor QXA21.. A6V10741072
Flush-mount KNX room sensor
(base and front module)
AQR2576N...
AQR2530NNW
AQR2532NNW
AQR2535NNW
AQR2535NNWQ
1411
Wall-mounted KNX sensors QMX3.P30
QMX3.P70 1602
Electric actuator, DC 0...10 V
(for radiator valve) SSA61.. 4893
Electric actuator, DC 0…10 V
(for 2 and 3 port valves/V..P45) SSC61.. 4895
Electric actuator, DC 0..10 V
(for small valve 2,5 mm V..P47) SSP61.. 4864
Electric actuator, DC 0..10 V
(for small valves 5.5 mm V..P45) SSB61.. 4891
Electric actuator, DC 0..10 V
(for Combi-valve VPI46) SSA61.. 4893
Electromotoric actuator, DC 0...10 V
(for valves 5.5 mm) SAS61.. 4581
Thermal actuator, DC 0…10 V
(for small vlves and radiator valves) STP63 4884
Damper actuators
DC 0…10 V and 3-position
GQD161..
GQD131.. 4605
GDB161..
GDB131.. 4634
GLB161..
GLB131..
GMA161..
GMA131.. 4614
GEB161..
GEB131.. 4621
GCA161..
GCA131.. 4613
GBB161..
GBB131.. 4626
GIB161..
GIB131..
VAV compact controller
GDB181.1E/3
3544
GLB181.1E/3
Valve actuators
DC 0...10 V
Damper actuators
DC 0...10 V and
3-position,
VAV compact
controllers
Sensors

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VAV compact controller
for KNX LTE-Mode
GDB181.1E/KN
3547
GLB181.1E/KN
Electromotoric On/Off valve and
actuator
(only available in AP, UAE, SA and IN)
MVI../MXI.. 4867
Electromotoric On/Off actuator SFA71.. 4863
Thermal actuator (for radiator
valves) STA73.. 4884
Thermal actuator
(for small valves 2.5 mm) STP73.. 4884
Electric actuator, 3-position
(for radiator valves) SSA81.. 4893
Electric actuator, 3-position
(for small valves 2.5 mm V..P47) SSP81.. 4864
Electric actuator, 3-position
(for small valves 5.5 mm V..P45) SSB81.. 4891
Electric actuator, 3-position
(for CombiValves VPI46) SSA81.. 4893
Electromotoric actuator, 3-position
(for valves 5.5 mm) SAS81.. 4581
*With PWM control, it is not possible to ensure exact parallel running of more than one thermal actuator. If several
actuators are controlled by the same room thermostat, preference should be given to motorized actuators with
On/Off or 3-position control
For more information about parallel operation and the maximum number of actuators that can
be used, refer to the Data Sheets of the selected type of actuator and the following listing:
Maximum number of actuators in parallel operation with RDG400KN and RDG405KN:
∂6 actuators S..81 (3-position)
∂4 actuators ST..73 (On/Off)
∂4 actuators SFA.., MVI.., MXI.. (On/Off)
∂10 damper actuators G..16.. DC
∂6 damper actuators G..13.. (3-position)
2.6 Accessories
Description Product No/
Stock No.
Data
Sheet
KNX power supply unit 160 mA (Siemens BT LV) 5WG1 125-1AB02 --
KNX power supply unit 320 mA (Siemens BT LV) 5WG1 125-1AB12 --
KNX power supply unit 640 mA (Siemens BT LV) 5WG1 125-1AB22 --
VAV compact controller
KNX LTE-Mode
On/Off/PWM valve
actuators AC 24 V*
3-position valve
actuators
AC 24 V
Note
On/Off valve actuators
AC 24 V

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3. Functions
3.1 Temperature and IAQ control (RDG405KN
only)
3.1.1 Temperature control
Setting of the control parameters (P01, etc., mentioned throughout the document)
is described in section 3.12.
The thermostat acquires the room temperature via built-in sensor, external room
temperature sensor (QAA32) or external return air temperature sensor (QAH11.1),
and maintains the setpoint by delivering actuator control commands to the heating
and/or cooling equipment. The following control outputs are available:
∂VAV box/air damper:
Modulating PI/P control with DC 0...10 V/3-position/KNX LTE-Mode
∂Heating/cooling coil, radiator, electric heater:
Modulating PI/P control with 3-position/PWM/DC 0...10 V/On/Off control
(2-position)
The switching differential or proportional band is 2 K for heating mode and 1 K for
cooling mode (adjustable via P30 and P31).
The integral action time for modulating PI control is
5 minutes for the RDG400KN and 45 minutes for the RDG405KN (adjustable via
P35).
The display shows the acquired room temperature or the Comfort setpoint, selecta-
ble via P06. The factory setting displays the current room temperature.
P04 is used to display the room temperature or setpoint in °F rather than °C as
needed.
The acquired room temperature (built-in or external sensor) is also available as
information on the bus.
∂With automatic changeover or continuous heating/cooling, symbols /
indicate that the system currently heats or cools (heating or cooling output
activated)
∂With manual changeover (P01 = 2), symbols / indicate that the system
currently operates in heating or cooling mode. Thus, the symbols are displayed
even when the thermostat operates in its neutral zone.
Symbols / indicate that the system currently heats or cools (heating or
cooling output activated)
Concurrent display of the current temperature or setpoint in °C and °F (P07 = 1) is
possible on the thermostat.
The outside temperature can be displayed on the room thermostat by setting
P07 = 2. This temperature value has only informative character.
In LTE-Mode, the outside temperature can only be received on outside temperature
zone 31.
Time of day via bus can be displayed on the room thermostat by setting
P07 = 3 or 4. The display is either in 12- or 24-hour format.
The information can be received from a Synco controller with time master
General note:
Parameters
Temperature control
Display
KNX R
Room temperature
/
Concurrent display of
°C and °F
KNX R
Outside temperature
via bus
KNX R
Time of day via bus

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functionality or any other KNX device if the corresponding communication object is
bound.
When engineering with the ETS tool, the time of day can only be displayed on the
RDG400KN when Synco group address 30/3/254 is loaded into the thermostat.
For further details, refer to Basic Documentation [6], "Communication via KNX-bus
for Synco 700", section "Engineering of big systems with ETS".
3.1.2 IAQ control (RDG405KN only)
The IAQ function is used for air quality control on VAV applications. The function is
achieved by controlling the air damper position according to the CO2level of the
indoor air as well as the temperature.
Note that the air damper position is also controlled according to the temperature. It
depends on which is higher, the temperature demand or the CO2level demand
signal.
The function shall improve the indoor air quality by increasing the volumetric air
flow or VAV output signal respectively.
∂If the IAQ value of the room is below the preset CO2setpoint, the VAV
output signal is controlled in accordance with minimum flow
∂If the IAQ value exceeds the CO2setpoint, the VAV output signal is
increased slowly until maximum flow is reached
∂CO2control is activated in Comfort mode only.
In Economy and Protection mode, this function is disabled
Vmax is reached, when the IAQ value exceeds the preset CO2setpoint plus the
CO2proportional band (SP+Xp).
Sp: CO2setpoint [P19]
Xp: CO2proportional
band [P20]
Vmin: Minimum flow
Vmax: Maximum flow
Parameter Object Description Values
Factory
setting
P19 CO2(VOC) setpoint CO2(VOC) setpoint OFF(0)…5000 ppm 1000
P20 CO2(VOC) P-band Xp Proportional band between
Vmin and Vmax 10…2000 ppm 400
Note
General note
Notes

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∂P19 can be set up to 5000 ppm but the external analog sensor is limited to
2000 ppm. If there is a need to measure above 2000 ppm, a KNX sensor is
required to send the value with the respective object
∂P19 = OFF switches the IAQ function off
∂The IAQ value is acquired either via a locally connected CO2or VOC
sensor or a CO2value via bus (e.g. KNX)
Important note for KNX LTE:
IAQ control does not influence in any way the energy demand air, heating or
cooling (in LTE-Mode).
IAQ control – priority CO2control
∂If the local CO2sensor input is configured, the thermostat uses the CO2
value from the locally connected sensor. Otherwise, the CO2value
available on KNX is used for CO2control
∂In case the local CO2sensor is configured, but the value is not valid (value
<100 ppm), the thermostat uses the CO2value via KNX bus.
If both CO2sources do not deliver a valid value, the CO2function is
disabled
∂S-Mode has a higher priority than LTE-Mode
∂If the CO2value comes from the bus, the local (DC 0…10 V) value is not
sent on the bus
∂Receiving and sending the same S-Mode object is not allowed
∂The thermostat receives the CO2LTE object when the corresponding
geographical zone is selected
The "Fresh air" symbol appears on the screen as soon as the actual CO2
value exceeds the CO2setpoint.
The IAQ level can be shown on the LCD.
3 choices are available:
∂P07 = 0 No display
∂P07 = 6 CO2concentration shown as ppm
∂P07 = 7 CO2concentration shown in the form of symbols
Selection P07 = 6: CO2concentration in ppm
The CO2concentration is shown on the second line with the ppm symbol.
Minimum display: 100 ppm
Maximum display: 5000 ppm
Display: IAQ function
Parameter
Name
Factory setting
Range
P07 Additional display
information
0 (RDG405KN only) 0 = --- (no display)
1 = °C and °F
2 = outside temperature (via bus)
3 = time of day (12 h) (via bus)
4 = time of day (24 h) (via bus)
6 = CO2concentration [ppm]
7 = CO
2
symbols

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Selection P07 = 7: CO2symbols
The CO2concentration is shown on the second line with "+++, ++-, +--". This
parameter can be useful when a VOC sensor is installed.
GOOD: Current CO2concentration is below the CO2setpoint
OKAY
: Current CO2concentration is within the CO2Xp
(proportional band)
POOR
: Current CO2concentration is above the CO2
setpoint + Xp (proportional band)
When the thermostat is programmed with a CO2display (ppm or symbols) and no
values are available (no sensor on U1 or no value on KNX), or when the value
received is below 100 ppm, the thermostat displays "---"
IAQ control using a VOC sensor
The VOC sensor can only be connected to the local analog input U1.
Since the thermostat does not distinguish between CO2or VOC sensor, the IAQ
function and the thermostat’s behavior are the same as for applications with a CO2
sensor.
For this application, we suggest to keep the default values of setpoint [P19] and
proportional band [P20]. Later, based on the occupant’s feeling, these parameters
can be readjusted for optimum room comfort.
3.2 Operating modes
The thermostat's operating mode can be influenced in different ways (see below).
Specific heating and cooling setpoints are assigned to each operating mode.
The thermostat sends the effective room operating mode on the bus.
The following operating modes are available:
In Auto Timer mode, the room operating mode is commanded via bus.
Auto Timer mode is replaced by Comfort mode when no time schedule via bus is
present.
In Comfort mode, the thermostat maintains the Comfort setpoint. This setpoint can
be defined via P8, P9 and P10.
It can be locally adjusted via the rotary knob or the bus.
The thermostat switches to Comfort mode when the presence detector (local or via
KNX) is active (room occupied).*)
The setpoints (less heating and cooling than in Comfort mode) can be defined via
P11 and P12.
The thermostat switches to Economy mode when ...
– the operating mode button is pressed (only possible if P02 = 2),
– Economy is sent via bus,
KNX R
Room operating mode:
State
Auto Timer
Comfort
Economy
KNX presence detector
(RDG405KN)

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– an operating mode switchover contact (e.g. keycard contact, presence detector,
window contact) is active (for RDG400KN); the contact can be connected to
digital input D1 or multifunctional input X1; set P38/P42 to 3 (P02 is irrelevant) *)
(for RDG400KN)
– "Window state" is sent via bus, e.g. from a KNX switch or a KNX presence
detector (P02 is irrelevant) *) (for RDG400KN)
*) Operating mode switchover: Only one input source must be used, either local input X1-D1or the
KNX bus. User operations are ineffective and OFF is displayed if the operating mode switchover
contact is active, or if "Window state" is sent via bus
In Protection mode, the system is ...
– protected against frost (factory setting 8 °C, can be disabled or changed via
P65),
– protected against overheating (factory setting OFF, can be enabled or changed
via P66).
No other operating mode can be selected locally if Protection mode is commanded
from the time schedule via bus (e.g. from RMB795). and are displayed.
The thermostat switches to Protection mode when …
– the operating mode button is pressed,
– Protection mode is sent via bus,
– the window contact on the RDG405KN is active (open window),
– "Window state" is sent to the RDG405KN via bus (e.g. from a KNX switch) *)
*) For details regarding the operating mode switchover contact (RDG40..KN), window contact
(RDG405KN) and presence detector (RDG405KN), refer to section 3.2.1.
KNXR
Room operating mode:
Window state
(RDG400KN)
Note
Protection
Note
KNX room operating
mode: Window state
(RDG405KN)

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3.2.1 Different ways to influence the operating mode
The operating mode can be influenced by different interventions.
The source of the effective room operating mode state can be monitored using the
"Cause" diagnostic data point in the ACS tool, or OZW772 web server.
Source
Description
Value of DP "Cause"
Local operation
via left button
∂
Operating mode is not Auto Timer
∂No time schedule via bus
Room operating mode selector
(preselection)
∂
Temporary Comfort extension is active "Timer" function
∂
Operating mode switchover contact (RDG400KN) Room operating mode contact
∂
Window contact (RDG405KN) Window switch
∂
Presence detector (RDG405KN) Presence detector
Bus command
KNX R
Room operating
mode
∂
Window state sent via bus (RDG400KN) Room operating mode contact
∂
Window state sent via bus (RDG405KN) Window switch
∂
Presence detector sent via bus (RDG405KN) Presence detector
∂
Time schedule available via bus
⇓local operating mode is set to "Auto Timer"
∂Time schedule sends Protection mode via bus
⇓operating mode cannot be changed locally
Time switch
The following table shows the priorities of different interventions.
Lower number means higher priority.
Priority
Description
Remark
•Commissioning In parameter setting mode (highest priority), you can always
command an operating mode independent of all other settings or
intervention via bus and local input.
‚Protection mode via bus
from time schedule
Protection mode sent by a time schedule has priority 2.
It cannot be overridden by the user nor by an operating mode
switchover contact.
ƒOperating mode
switchover contact
(RDG400KN)
If the contact is closed, the operating mode changes to Economy.
This overrides the operating mode on the thermostat.
ƒWindow contact
(RDG405KN)
If the contact is closed, the operating mode changes to
Protection. This overrides the operating mode on the thermostat.
ƒ"Window state" via bus "Window state" sent via bus has the same effect as the operating
mode switchover contact (RDG400KN) or local window contact
(RDG405KN).
Note: Only one input source must be used, either the local input
X1-D1 or the KNX bus.
„Operating mode button The user can change the operating mode using the operating
mode button.
„Operating mode via bus The operating mode can be changed via bus.
„Temporary extended
Comfort mode via
operating mode button
The operating mode can be temporarily set from Economy to
Comfort by pressing the operating mode button, if ...
– Economy mode was sent via bus,
– extended Comfort mode period >0 (P68)
The last intervention wins, either locally or via bus.
„Time schedule via bus The operating mode sent via bus can be overridden by all other
interventions. Exception: Protection mode has priority 2.
„Presence detector
(RDG405KN)
If the contact is closed (room occupied), the operating mode
changes to Comfort. This overrides the operating mode on the
thermostat. An open contact (room unoccupied) sets the
thermostat back to the previous operating mode.
„Presence detector via
bus (RDG405KN)
"Presence detector" sent via bus has the same effect as the
local presence detector.
Note:
Only one input source must be used,
either
the
local
input
X1-D1or the KNX bus.
Source for change of
operating mode
ACS
Priority of operating
mode interventions

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If a time schedule via bus is present (e.g. from the central control unit), Auto Timer
mode is active. In that case, the thermostat changes automatically between
Comfort and Economy mode according to the time schedule via bus.
The display shows the Auto Timer mode symbol along with the symbol for the
effective room operating mode (Comfort or Economy ).
By pressing the operating mode button, another operating mode can be selected.
Each time the time schedule sends a new operating mode (switching event), the
operating mode of the thermostat is set back to Auto Timer mode. This is to ensure
that the room temperature is maintained according to the time schedule.
If the time schedule sends Precomfort mode, this mode changes either to
Economy (factory setting) or Comfort (selectable via P88).
No intervention is possible neither by the user nor by an operating mode switch-
over contact, if Protection mode is set by the time schedule. OFF blinks on the
display when the user presses a button.
The operating mode can be selected locally via the operating mode button.
The behavior of the operating mode button (user profile) can be defined via P02
(factory setting is P02 = 1).
P02 Without time
schedule
With time
schedule via bus
Description
1⇓⇓∂Switching manually between 2 modes, Economy is not
available (factory setting)
∂Suited for hotel guest rooms or commercial buildings
∂If a time schedule via bus is available, Comfort mode can
be temporarily extended (see below)
2⇓⇓ ⇓ ⇓⇓ ∂Switching manually between 3 modes
∂Suited for homes and rooms where manual switching to
Economy mode is desired
The thermostat can be forced into Economy mode (e.g. when a window is opened,
when a presence detector signals "No one present", when the keycard of a hotel
room is withdrawn, etc). The contact can be connected to digital input D1 (or
multifunctional input X1). Set P42 (P38) to 3.
If the operating mode switchover contact is active, pressing the left button will show
OFF (blinking).
The thermostat is forced into Protection mode when the window is open. The
contact can be connected to multifunctional input X1 or digital input D1. Set P38 or
P42 to 3. User operations are ineffective and OFF displays if the window contact is
active.
The function is also available via the KNX signal "Window state", e.g. from a KNX
switch or a KNX presence detector.
Note: Only one input source must be used, either local input X1-D1or the KNX bus.
User operations are ineffective and OFF is displayed if the operating mode switch-
over contact is active, or if "Window state" is sent via bus.
Behavior when bus
sends new operating
mode
Precomfort via bus
Behavior when bus
sends Protection
Availability of Economy
mode
Operating mode
switchover contact
(window contact)
(RDG400KN)
Window contact
(RDG405KN)
KNXR
Room operating mode:
Window state
Auto Timer mode
with time schedule
via bus

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The operating mode can be changed to Comfort or Economy based on room
occupancy (room occupied or unoccupied, via presence detector or keycard).
Time schedule
via bus
Presence detector behavior
Comfort mode
∂
Whenever the presence detector is activated or deactivated,
Comfort mode is maintained
Economy mode
∂
Whenever the presence detector is activated, the operating
mode changes to Comfort
∂Whenever the presence detector is deactivated, the
operating mode changes to Economy (with Auto mode)
Protection mode
∂
Presence detector has no impact on the operating mode
Not available
∂
Whenever the presence detector is activated, the operating
mode changes to Comfort
∂Whenever the presence detector is deactivated, the
operating mode changes to Economy
∂When the time switch changes to Economy, but the presence detector is still
active, Comfort mode is maintained until the presence detector becomes
inactive
∂The contact (e.g. a card reader) can be connected to multifunctional input X1
or digital input D1 (set P38 or P42 to 10) or the occupancy is sent via bus from
a KNX presence detector (only one input source must be used, either local
input X1-D1 or the KNX bus)
Comfort mode can be temporarily extended (e.g. working after business hours or
on weekends) when the thermostat is commanded to Economy mode by a central
time switch, operating mode switchover via KNX or via local input X1-D1.
The operating mode button switches the operating mode back to Comfort for the
period preset via P68.
Press the operating mode button again to stop the timer.
The following conditions must be fulfilled:
∂Mode selection via operating mode button is set to "Protection-Auto" (P02 = 1)
and P68 (extend Comfort period) is greater than 0
∂The time schedule via bus is Economy or operating mode switchover is active
During the temporary Comfort mode extension, symbol appears.
If P68 (extend Comfort period) = 0, extended Comfort cannot be activated;
pressing the left button switches the thermostat to Protection mode.
The effective room operating mode can be forced temporarily into Comfort or
Economy/Protection mode. The time period is adjusted via the rotary knob:
∂Extend presence: Set the device to Comfort mode for the selected time period
∂Extend absence: Set the device to Economy/Protection mode for the selected
time period
To activate the function, keep the left button pressed and, within 3 seconds, turn
the rotary knob …
∂clockwise for extended presence,
∂counterclockwise for extended absence.
The rotary knob adjusts the time period:
∂Extend presence: 0:00…+9:30 in steps of 30 minutes; symbol appears
∂Extend absence: 0:00…–9:30 in steps of 30 minutes; symbol or appears
During the extended presence/absence period, the sandglass symbol appears.
KNXR
Presence detector
(RDG405KN)
Notes
Temporary timer to
extend Comfort mode
Timer for extension of
presence/absence