2 741 s Synco™ living HVAC central apartment unit with consumption data QAX903 acquisition Series A • • • • • • • • • • • • • • CE1N2741en 2016-01-30 Heating and cooling control management for an apartment including precontrol for 2 room groups Ventilation plant management Air conditioning equipment management (e.g.
Use • Heating and cooling control management for an apartment. • Radiator/floor cooling monitored for dew point. • Increase the Economy room setpoint and minimum flow temperature setpoint dependent on composite outside air temperature. • Collect heating/refrigeration requests from individual rooms. • Generate heating or refrigeration request signals and transmit them to heating and refrigeration generation via wired bus, via heat/refrigeration demand relay, or via DC 0…10 V output to the RRV912 or RRV934.
The QAX903 central apartment unit can be used together with the following hardwired products from the Siemens Synco 700 system: Device designation Type Documentation *) Synco 700 control units RM.. S3110en Central communication unit OZW771 N3117en Service tool OCI700.1 N5655en OCI702 A6V10438951 Service interface for USB / KNX See also the product range overview "Acvatix valves and actuators 0-92205-en". *) The documents can be downloaded from http://siemens.com/bt/download.
Specific functions for heating and cooling plants Heating/cooling request The central apartment unit forms a heating or cooling demand signal from the collected heating or cooling requests and forwards it to the heating or refrigeration generation controller. The heating/refrigeration demand signal can be delivered via the universal relay output (switching) or at the DC 0…10 V output (modulating) of an RRV912 heating circuit controller or RRV934 multi-controller.
Outside air temperature-controlled night setback The Economy room temperature setpoint to heat all rooms is increased dependent on the composite outside temperature. The transitions are adjustable and help prevent peak loads during changeover, for example, from Economy to Precomfort or Comfort. Minimum flow setpoint The minimum flow temperature setpoint is increased depending on the composite outside air temperature, ensuring a minimum flow temperature in uncontrolled rooms.
Cooling enable contact 1 cooling enable contact can be assigned to each room to activate a cooling unit (e.g. split unit). Enabling can occur via the local relay contact of the central apartment unit, the relay contacts on the heating circuit controllers RRV912 / RRV918, the multicontroller RRV934, or via S-mode.
Specific functions to acquire and display consumption data Consumption data acquisition Integrating the consumption data interface WRI982 allows for displaying energy consumption on the central apartment unit and sending it to a service provider via web server OZW772. Monthly and annual cutoff values are displayed and forwarded in addition to current meter readings. A corresponding info page is maintained for each meter type. Available meter types and max.
Synergyr integration The Synco living ECA system is fully compatible with the Synergyr system and allows for conversion of individual units in a Synergyr system (partial migration). The meter information is displayed on the QAX903 central apartment unit and forwarded via the Synergyr building bus to the OZW30 building central station. Detailed information the Synco living ECA system is available in the data sheet on the consumption data interface (N2735en).
Outputs • Transmit heat demand (switching) • Transmit heat demand DC 0…10 V • Transmit cooling demand (switching) • Transmit cooling demand DC 0…10 V • Cooling enable • Switching room group pump 1 - 2 • Precontroller mixing valve 1 - 2 • Step switch 1 to 3 stages • Heat recovery bypass • Enable exhaust hood • Enable cooling unit 1 - 12 • Transmit changeover to summer operation Communication The central apartment unit communicates via a wireless bus (KNX RF) or a wirebound bus (KNX TP).
Error messages The QAX903 delivers detailed error messages to simplify localizing any errors. They are output as clear-text messages, thus simplifying interpretation of messages by the user or expert. Error messages can be used for triggering other events, such as optical or audible alarms. The last 10 error messages are saved in history and can be individually retrieved. Delivery state The central apartment unit can be reset to the delivery state via an operating line.
Ventilation plant integration Q1 - Q3 X1 X2 3-stage step selector of ventilation plant Air quality sensor, DC 0…10 V Humidity sensor DC 0…10 V FOL AUL ZUL ABL Exhaust air Outside air Supply air Extract air 11 / 18 Siemens Building Technologies HVAC central apartment unit with consumption data acquisition QAX903 CE1N2741en 2016-01-30
Operating and display elements 2741P01.tif Operating element functions Ventilation button Button for ventilation mode. To set the ventilation state (Auto / Off / Stage 1 / Stage 2 / Stage 3) for one-time rapid ventilation. Absence button To select the absence function (absent/present). The Absence function influences heating, cooling, and ventilation. Apartment timer button To set and activate the timer function for selected rooms.
Display • Fully graphic backlit display • Visualization of information with symbols and clear-text output • Info pages for: − Outside air temperature curve − Air pressure curve − Window − Apartment − Ventilation − Room − Consumption data − Business card − Device status − Fault status message bus • Selectable format of quiescent picture Notes on engineering and operation Mounting location • Comply with all local regulations on electrical systems.
System limits System limits (bus TP) 126 Central apartment units QAX903 Limitation per central apartment units 1 12 1 1 1 3 4 4 4 3 3 2 94 Meteo sensor Rooms Humidity sensor Air quality sensor Condensation monitor RF repeaters Heat meters (heating, cooling or combined) Hot water meters Chilled water meters Electricity meters Gas meters Other meters (e.g.
Radio communications RF Range RF protocol 868.3 MHz (bidirectional) Typically 30 m in buildings KNX RF-compatible Wired communications Bus protocol / type Bus power supply KNX TP Simplified bus power supply, 12.5 mA; bus power supply may only be switched on for operating an OZW771 or OZW772. RJ45 plug on underside of housing Service interface Display Fully graphic backlit display (white background) Universal input Type Number Measuring range Copper cable 0.6 mm dia.
Environmental compatibility Product environmental declaration (contains data on RoHS compliance, materials composition, packaging, environmental benefit, disposal) CE1E2740 *) *) The documents can be downloaded from http://siemens.com/bt/download. Eco design and labeling directives Class Application with one outside temperature sensor and up to VIII 12 room temperature sensors and on/off, PWM, or modulating control *) Efficiency gain 5% *) in combination with separate boiler controller (e.g.
Q13, Q14 N L CE-, CE+ M B 2707Z24 CEKNX CE+ M B N L Q13 Q14 230 V Connection terminals Universal, potential-free relay output Operating voltage, neutral conductor AC 230 V Operating voltage, phase AC 230 V Connection of data bus KNX TP- and KNX TP+ Ground for universal input Universal input Connection diagram KNX AC 230 V L N CE- Q13 Q14 CE+ 2 707Z05 L 1) B M N1 2) N N1 1) 2) L N CE- / CE+ Central apartment unit QAX903 Universal input, for temperature measurement/digital input Univers
Dimensions Central apartment unit Dimensions in mm Base Published by: Siemens Switzerland Ltd. Building Technologies Division International Headquarters Gubelstrasse 22 6301 Zug Switzerland Tel. +41 41-724 24 24 www.siemens.
