Central apartment unit for HVAC and energy consumption data collection

Stock no. BPZ:QAX903..

Stock no. BPZ:QAX903..

The central apartment unit serves as an operator and display unit for an apartment.

It manages individual room control (heating/cooling) of up to 12 rooms, comfort ventilation, precontrol, control of air conditioning equipment, and acquires the consumption data of heat, water, electricity and gas.

  • Management of heating and cooling control for one apartment

  • Suited for heating and cooling plants with central distribution (e.g. underfloor heating) and radiators with decentral connections

  • Selection of operating mode, timer and holidays / special day function for the apartment

  • Independent time switches and operating modes for 12 rooms

  • Flow temperature control of 2 independent room groups including limitation (min. / max.) and maintained return temperature (high / low)

  • Increase of economy room temperature setpoint and minimum flow temperature setpoint depending on the composite outside temperature

  • Collection of heat / cooling requests from the individual rooms and forwarding the requests to the heat/cooling sources via wired bus, heat/cooling demand relay or DC 0...10 V output to the RRV912 or RRV934

  • Absence function (heating, cooling, ventilation)

  • Management of 3-stage ventilation plant via RRV934 multicontroller, incl. night cooling

  • Control of air conditioners (split units) via universal outputs (locally and RRV91x) or via S-Mode (KNX TP1)

  • Display of meteorological data

  • Presentation of key data on info pages

  • Remote access via Siemens web server OZW772.xx

  • Intuitive and simple control with Android or IOS App

  • Collection of meter data (heat / cool, electricity, water, gas) to support automated meter reading & billing



Operating voltage

AC 230 V


50 Hz

Power consumption

7 VA

Measuring range, temperature

0...120 °C


Full graphic backlit display


KNX RF-compatible, 868.3 MHz bidirectional (RF) and KNX TP1 (wired bus)

Indoor wireless range

30 m

Universal inputs, number


Universal input, signal

Digital 0/1, LG-Ni1000

Relay outputs, number


Relay output, switching voltage

AC 24...230, NO - contact V

Relay output, switching current

AC 0.02...2 (2) A


With screws

Degree of protection


Dimensions (W x H x D)

230 x 130 x 29.7 mm

Product Variants