s Semi-flush mount room thermostats with KNX communications RDU341 Basic Documentation Edition: 1.
Contents 1. About this document ........................................................................... 4 1.1 Revision history ..................................................................................... 4 1.2 Reference documents ............................................................................ 4 1.3 1.3.1 1.3.2 1.3.3 Before you start ..................................................................................... 5 Copyright ..............................................
.10.8 3.10.9 3.10.10 3.10.11 3.10.12 Air demand .......................................................................................... 40 Electric heater interlock by supply air controller (LTE mode only) ......... 41 Primary fan overrun after switching off the electric heater ..................... 41 Fault function on KNX .......................................................................... 42 Emergency control (LTE Mode only) .................................................... 43 3.11 3.11.
1. About this document 1.1 Revision history Edition Date Changes Section Pages 1.2 1.1 2017-02-17 2015-06-08 Update heartbeat Update the mounting notes, disposal notes, declaration information and connection diagrams 40 52 56 62 65 1.0 16 Jul 2010 First edition 3.10.5 4.1 4.5 6.2 8 all 1.2 Subject Semi-flush mount room thermostats with KNX communications, RDU341 KNX Manual Ref [1] [2] [3] Synco and KNX (see www.siemens.com/synco) [5] [6] [4] Reference documents Doc No.
1.3 Before you start 1.3.1 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. 1.3.2 Quality assurance This document was prepared with great care.
1.4 Target audience, prerequisites This document assumes that users of the RDU KNX thermostats are familiar with the ETS Professional and/or Synco ACS700 tools and able to use them. It also presupposes that these users are aware of the specific conditions associated 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, see section 1.2. 1.
RDU341 Summary 2.1 Types Stock number S55770-T106 2.2 Operating voltage AC 24 V Control outputs 3 pos ON/OFF DC 0..10 V Housing color Product number 2. -- white Ordering ∂ When ordering, please indicate both product no. / stock no. and name: E.g. RDU341 / S55770-T106 room thermostat ∂ Order valve actuators separately 2.
– Sensor for automatic heating / cooling changeover – External room temperature or return air temperature sensor – Dew point sensor – Electric heater enable – Fault input – Monitor input for temperature sensor or switch state ∂ Reload factory settings for commissioning and control parameters 2.
Synco topology Legend: DESIGO, Apogee and third-party systems Synco 700 Synco living RDG..., RDF…, RDU… OZW772 (or OZW775) RMZ792-B QAW...
2.5 Equipment combinations Type of unit Cable temperature sensor, cable length 2.5 m NTC (3 kς at 25 °C) Room temperature sensor NTC (3 kς at 25 °C) Condensation detector / Supply unit DC 0…10 V valve actuators Electrical actuator, DC 0..10 V (for radiator valve) Electrical actuator, DC 0..10 V (for 2 and 3 port valves / V…P45) Electrical actuator, DC 0..10 V (for small valve 2,5 mm) Electrical actuator, DC 0..10 V (for small valves 5.5 mm) Electrical actuator, DC 0..
2.6 Accessories Description Changeover mounting kit (50 pcs / package) Plastic mounting bracket for RDU semi-flushmount thermostats for increasing the headroom in the conduit box by 10 mm Conduit box for semi-flush mounted thermostat KNX power supply 160 mA (Siemens BT LV) KNX power supply 320 mA (Siemens BT LV) KNX power supply 640 mA (Siemens BT LV) Product no / Stock no. ARG86.3 ARG70.
3. Functions 3.1 Temperature control General note: Parameters Setting of the control parameters (P01, etc., mentioned throughout the document) is described in section 3.12. Temperature control 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 heating and/or cooling equipment.
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. K NX R Room operating mode: State The thermostat sends the effective room operating mode on the bus. The following operating modes are available: Auto Timer In Auto Timer mode the room operating mode is commanded via bus.
3.2.1 Source for change of operating mode ACS Source Local operation via operating mode button Bus command K NX R Room op. mode • ‚ ƒ ƒ „a „b „c … 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, operator unit RMZ792-B or web server OZW772.
Auto Timer mode with time schedule via bus If a time schedule via bus is present, e.g. from central control unit, then the Auto Timer mode is active. The thermostat automatically changes between Comfort and Economy 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, you can change to another operating mode.
Temporary timer to extend the Comfort mode Comfort mode can be temporarily extended (e.g. working after business hour or on weekends) when the thermostat is commanded to Economy mode. The operating mode button switches the operating mode back to Comfort for the period preset in P68. Press the operating mode button again to stop the timer.
3.2.2 Communication examples The following examples show two typical applications of a central time schedule in conjunction with local control of the room operating mode. The room operating mode in rooms 1…2 of a building is determined by the time schedule. Window contacts are fitted in all rooms.
Interaction of user operation (operating mode button) and central time schedule Example 2 In room 2, the window is opened briefly, once in the morning and once at night (1). Only the opening in the morning has a direct impact on the effective room operating mode. With the operating mode button, the operating mode can be changed between OFF and Auto or temporary Comfort extension respectively. ∂ ∂ ∂ ∂ Time schedule Room operating mode During lunch break, the time schedule changes to Precomfort.
Comfort mode 3.3 Room temperature setpoints 3.3.1 Description The factory setting for the Comfort basic setpoint is 21 °C and can be changed in the thermostat’s EEPROM via parameter P08 or via bus with communication object " Comfort basic setpoint". The last intervention always wins. The Comfort setpoint can be adjusted via +/- buttons, or via bus from a remote device like a touchpanel, operating unit, etc. The last intervention always wins.
Caution If a setpoint (Economy or Protection) is set to OFF, the thermostat does not control the room temperature in the corresponding mode (heating or cooling). This means no protective heating or cooling function and thus risk of frost in heating mode or risk of overtemperature in cooling mode! The Economy setpoints are accessible at the service level (P11, P12); the Protection setpoints at the expert level (P65, P66). 3.3.
1) Only required for heating AND cooling applications (see section 3.6.6) 2) The shift is added to the local shift (LTE mode only) 3) The last intervention wins, either S-Mode input or local operation KNX R Current setpoint The current setpoint (used by the thermostat for temperature control) is available on the bus for use in the central control unit.
3.4 Applications overview The thermostats support the following applications, which can be configured using the DIP switches inside the front panel of the unit or a commissioning tool. All DIP switches need to be set to OFF (remote configuration, factory setting) to select an application via commissioning tool. In this case the output signal type needs to be set in ACS as well. The tool offers the applications printed in bold text (basic applications).
3.5 Air heating / cooling changeover K NX R Supply air temperature Additional functions The supply air temperature sent by the primary controller indicates whether cool or warm air is supplied. The controller determines the necessity to open or close the air damper according to the supply air temperature, the room temperature setpoint and the current room temperature. If no Supply air temperature is available via bus, then the air changeover is cooling per default.
Manual heating / cooling changeover If manual heating / cooling changeover is commissioned (P01 = 2), then heating / cooling mode cannot be changed via bus / changeover sensor / switch; it will remain in the last mode as selected locally via button. External / return air temperature sensor The thermostat acquires the room temperature via built-in sensor, external room temperature sensor (QAA32), or external return air temperature sensor (QAH11.1), connected to multifunctional input X1 or X2.
3.6 Control sequences 3.6.1 Sequences overview (setting via parameter P01) The mode of the air control sequence can be set via parameter P01. It is only available with application "Single duct" In all application the changeover of the air sequence can be done via supply air temperature sent by the primary controller.
3.6.2 K NX Application mode The behavior of the thermostat can be influenced by a building automation and control system (BACS) via bus with the command “Application mode”. With this signal, cooling and/or heating activity can be enabled or disabled. Application mode is supported in LTE mode and S-mode.
ACS Operating Heating OR cooling The state (heating or cooling) of the thermostat can be monitored with the ACS tool (diagnostic value “Control sequence”). The last active mode is displayed when the thermostat is in the dead zone or temperature control is disabled. With a single-duct application, the control sequence state is determined by the application mode (see section 3.6.
3.6.3 Minimum and maximum air volume The factory setting for minimum and maximum air volume is 0 / 100% respectively. These values can be changed using parameters P63 / P64. If Vmin is greater than 0, a minimum air flow of Vmin is assured in Comfort and Economy mode. In Protection (or Economy mode with setpoint = OFF), Vmin is fixed to 0.
3.6.4 Single-duct On single-duct applications, the thermostat controls an actuator (air damper, VAV system, valve etc.)… – in heating / cooling mode with changeover (automatic or manual), – heating only mode, – or cooling only mode. Cooling only is factory-set (P01=1). The output signal for the air flow can be limited to a minimum and maximum value if required (see section 3.5). Modulating control: DC 0…10 V The diagrams below show the control sequence for modulating PI control.
3.6.5 Caution Single-duct with electric heater General rule: In case of insufficient air flow, the thermostat cannot protect the electric heater against overtemperature. Therefore the electric heater MUST feature a separate safety device (thermal cutout). On single-duct applications with electric heater, the thermostat controls a valve plus an auxiliary electric heater. Parameter P01 is not available.
Sequences ON/OFF electric heater Without a valid bus signal for changeover air, the air volume is only increased for cooling: Note: Y TR W H C Output signal Room temperature Effective setpoint Comfort Heating sequence Cooling sequence YV Volume flow rate YE XpH XpC Vmin Electric heater Proportional band heating Proportional band cooling Minimum volume output Vmax Maximum volume output The diagrams only show the PI thermostat’s proportional part.
3.6.6 Setpoints and sequences Single duct / single duct with heating / cooling coil ∂ Comfort setpoint (W) is in the currently active heating or cooling sequence Single duct with el.
Overview of control outputs 3.7 Control outputs 3.7.1 Overview Different control output signals are available. They need to be defined during commissioning (see below). Control output Product no. RDU341 ON/OFF 3-position DC 0…10 V Y21 -- Y10 DC 0..10 V control signal The demand calculated by the PI control from the current room temperature and setpoint is provided to the damper actuator as a continuous DC 0...10 V signal via output Y10.
3.8 Multifunctional input, digital input The thermostat has 2 multifunctional inputs X1 and X2 An NTC type sensor like the QAH11.1 (AI, analog input) or a switch (DI, digital input) can be connected to the input terminals. The functionality of the inputs can be configured via parameters P38 + P39 for X1, P40 + P41 for X2. K NX The current temperature or state of the inputs X1/X2 is available on bus for monitoring purposes.
# 6 K NX Function of input Fault R 7 Monitor input (Digital) Digital input to signal an external fault (example: dirty air filter). If the input is active, “ALx” is displayed and a fault is sent on the bus. See also section 3.10.11. (Alarm x, with x = 1 for X1, x = 2 for X2). Note: Fault displays have no impact on the thermostat's operation. They merely represent a visual signal. Digital input to monitor the state of an external switch via bus.
3.9 Temperature out of range Handling faults When the room temperature is outside the measuring range, i.e. above 49 °C or below 0 °C, the limiting temperatures blink, e.g. “0 °C” or “49 °C”. In addition, the heating output is activated if the current setpoint is not set to “OFF”, the thermostat is in heating mode and the temperature is below 0 °C. For all other cases, no output is activated. The thermostat resumes Comfort mode after the temperature returns to within the measuring range.
RDU Time Switch Geogr. zone 2.5.1 Geogr. zone 2.5.1 or 2.1.1 Room temperature Operating mode Operating mode Air handling unit Air distr zone 1 Air distr zone 1 Air demand Air demand Sensor Outside temperature Engineering and commissioning Outside temperature zone 1 Outside temperature 3172Z02en Outside temperature zone 1 ∂ For a detailed description of KNX (topology, bus supply, function and setting of LTE zones, filter tables, etc.
The zones to be defined are as follows: Geographical zone (space zone) Zone in which an RDU KNX thermostat is physically located. Other room-specific devices may also be located in this zone. (Apartment . Room . Subzone) Apartment = ---, 1...126 Room = ---, 1...63 Subzone = fix 1 Information exchanged in this zone is related specifically to the device like operating mode, setpoints, room temperature, etc. The designations "Apartment", "Room" and "Subzone" do not need to be taken literally.
3.10.4 Example of heating and cooling demand zone The building is equipped with Synco controls on the generation side and RDU / RDG thermostats on the room side. Konnex TP1 RMH760 Controller 1 RMB795 Controller 3 Controller 2 RDF... Controller 4 RDU... Controller 5 RDG...
3.10.5 Send heartbeat and receive timeout In a KNX network, S-mode and LTE mode communication objects can be exchanged between individual devices. The Receive timeout defines the period of time within which all the communication objects requested from a device is received at least once. If a communication object is not received within this period, a predefined value is used.
3.10.9 Electric heater interlock by supply air controller (LTE mode only) To avoid overheating of an electric heater, sufficient flow of supply air must be guaranteed. The thermostat features the function “Interlock of el. heater via supply air controller”, which is active when a supply air controller (e.g. Synco RMU7xx) is used in the system.
3.10.11 Fault function on KNX If a fault occurs (e.g. digital fault input, dew point, communication configuration, etc.) then a fault will be sent on the bus. An RDU thermostat listens on the bus and sends its fault when the fault has the highest alarm priority. This ensures that the management station does not miss any alarms. If alarms occur at the same time, the alarm with the highest priority will be first displayed and sent on the bus.
3.10.12 Emergency control (LTE Mode only) In case of smoke or fire the damper can be overridden via KNX. The necessary information is provided by the function block “HVAC Emergency Mode” The table below describes the behavior of the controller output.
3.11 Communication objects (S-mode) 3.11.
3.11.2 Description of communication objects Obj 1 Object name System time Function Type/ length Flags Time and 19.001 CWU date 8 Byte System time for display on the room thermostat. See parameter P07 (3 or 4) 3 Time of day Time and 10.001 CWU date 3 Byte Another object for receiving the time of day for display on the room thermostat. See parameter P07 (3 or 4) 4 Fault information Alarm 219.001 CT Info 6 Byte Common alarm output. If an alarm occurs, the alarm number is transmitted 5 Fault state Faulty / 1.
Obj 28 Object name Function Type/ length Flags Enable electric Enable / 1.003 CWU heater disable 1 bit An electric heater can be disabled with this communication object (e.g. to meet tariff regulations). The same function is also available via local multifunctional input X1/X2 (parameter P38, P40). Only one input source must be used, either local input X1/X2or KNX bus. 30 Supply air Temp. 9.
3.12 Control parameters A number of control parameters can be readjusted to optimize control performance. This can be done on the thermostat via HMI or via commissioning / operating tool. These parameters can also be set during operation without opening the unit. In the event of a power failure, all control parameter settings are retained.
3.12.2 Parameter setting / download via tool Control parameters can be adjusted via bus either by parameter download during commissioning or during normal operation with a tool like ACS.
Parameter 3.12.3 Parameters of the "Service level" Name Factory setting Range 0 = Heating only 1 = Cooling only 2 = H/C changeover manual 3 = H/C changeover auto 1 = Auto - Protection 2 = Auto - Comfort - Economy Protection 0 = °C 1 = °F – 3 ... 3 K 0 = Room temperature 1 = Setpoint 0 = --- (No display) 1 = °C and °F 2 = Outside temperature (via bus) 3 = Time of day (12h) (via bus) 4 = Time of day (24h) (via bus) 5 ... 40 °C 5 ... 40 °C 5 ... 40 °C OFF, 5 ...
Parameter 3.12.4 Parameters of the "Expert level with diagnostics and test" Name Factory setting Range 0.5 … 6 K 0.5 … 6 K 0.5 … 5 K 0…10 min 10…25 °C 27…40 °C 0 = --- (no function) 1 = Room temp ext.
Parameter Name Factory setting Range 255 --1 --0 1…255 ---, 1...126 ---, 1...63 ---, 1...31 0 = Economy 1 = Comfort Communications P81 P82 P83 P87 P88 1) 2) 1) Device address Geographical zone (apartment) 2) Geographical zone (room) Air distribution zone Transformation Precomfort 2) Physical address = Area.Line.DeviceAddress. Factory setting for Area = 0, Line = 2. Can be changed by special management service e.g. from line coupler or via ACS commissioning tool. Type = geographical zone A.R.S.
4. Handling 4.1 Mounting and installation Mount the room thermostat on a recessed square conduit box with 60.3 mm fixed centers. Do not mount on a wall in niches or bookshelves, behind curtains, above or near heat sources, or exposed to direct solar radiation. Mount about 1.5 m above the floor.
4.2 Commissioning The room thermostats are delivered with a fixed set of applications. Applications Select and activate the relevant application during commissioning using one of the following tools: – Local DIP switch and HMI – Synco ACS – ETS DIP switches Set the DIP switches before snapping the front panel to the mounting plate, if you want to select an application via DIP switches.
Control parameters The thermostat's control parameters can be set to ensure optimum performance of the entire system. The parameters can be adjusted using – Local HMI – Synco ACS – ETS The control parameters of the thermostat can be set to ensure optimum performance of the entire system (see section 3.12). Control sequence ∂ The control sequence may need to be set via parameter P01 depending on the application. The factory setting is as follows: Application Single duct Single duct with el.
4.3 Operation See also Operating Instructions B3172 [2] enclosed with the thermostat.
Display 1 3 2 6 7 8 4 9 5 10 1 Operating mode Protection Comfort Economy Auto Timer according to schedule (via KNX) 2 Displays room temperature, setpoints and control parameters. Symbol indicates the current room temperature 4.
ETS 5. Supported KNX tools 5.1 ETS ETS is an engineering tool. It is used to set up the communication of the RDU KNX thermostat and assigns the communication object to group addresses (S-mode). Parameters are only used for choosing (making visible / hiding) the communication objects. This Manual does not describe how to operate ETS and commission a device. Refer to the KNX Manual for more details. STOP Setting RDU KNX parameters is only supported by ETS3f or higher. Note! 5.1.
5.2.1 Parameter settings in ACS In the ACS program, select Plant, then Open to open the plant. To start the parameter settings, select Applications, then Plant engineering…:: The application and control parameters can be adjusted and downloaded. Column Line no. contains the parameter number as shown in the parameter table. Refer to section 3.12. STOP Note! Some parameters have a different range in ACS than in the room thermostats. The thermostat does not accept changes that are outside its range.
5.2.2 ACS Operating Parameter settings in ACS Notes: Operation and monitoring with ACS In the ACS program, select Plant, then Open to open the plant. To start monitoring and operation, select Applications, then Plant operation. ACS supports parameter settings even during normal operation. To change a control parameter, select Popcard, then Settings.
Plant diagram in ACS ACS offers plant diagrams for easy monitoring and operation of the thermostat.
Operation and monitoring with OZW772 5701Z01a 5.2.3 Web browser Internet / Intranet OZW772.. USB Ethernet Ethernet Router KNX TP1 The OZW772 web server enables users to operate a Synco HVAC system from a remote location – via PC or from a smart phone via the web. A start page shows the most important data points. A combination of menu / path navigation enables users to access all data points quickly and straightforwardly. The entire installation can be visualized in the form of plant diagrams.
Connection 6.1 Connection terminals G G0 X1 M L Y21 X2 CE+ CE Y10 G0 SELV 3172A21 6. G, G0 L Y10, G0 Y21 X1, X2 M CE+ CE- 6.2 Operating voltage SELV AC 24 V Supply for electric heater AC 230 V Output for damper, VAV compact controller Output for electric heater Multifunctional input for temperature sensor (e.g. QAH11.1) or potential-free switch Factory setting: – X1 = Operating mode switchover contact – X2 = External sensor (function can be selected via parameter P38 / P40).
7. Mechanical design 7.1 General The thermostats consist of 2 parts: ∂ Front panel with electronics, operating elements and built-in room temperature sensor ∂ Mounting base with power electronics The rear of the mounting base carries the screw terminals. The base fits on a square conduit box with 60.3 mm fixed centers. Slide the front panel in the mounting base and snap on.
7.
8. Power supply Technical data SELV AC 24 V / DC 24 V or AC 24 V / DC 24 V class 2 (US) AC 24 V 50/60 Hz Max. 2.5 VA / 0.9 W Circuit breaker max. 10 A Characteristic B, C, D according to EN 60898 or Power source with current limitation of max. 10 A Operating voltage DC 24 V: connect G to + and G0 to Rated voltage Frequency Power consumption External supply line protection (EU) No internal fuse. External preliminary protection with max.
Environmental conditions Standards and directives General Built-in room temperature sensor Measuring range Accuracy at 25 °C Temperature calibration range Settings and display resolution Setpoints Current temperature value displayed Operation Climatic conditions Temperature Humidity Transport Climatic conditions Temperature Humidity Mechanical conditions Storage Climatic conditions Temperature Humidity EU Conformity (CE) RCM conformity Electronic control type Safety class Pollution class Degree of protec
Index A Air demand ......................................................... 40 Air heating / cooling changeover ......................... 23 Applications overview ......................................... 22 Auto Timer mode ................................................ 15 Automatic heating / cooling changeover .............. 23 B Button lock.......................................................... 24 C Changeover switch ............................................. 23 Control output VAV...............
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