Central apartment unit for HVAC and energy consumption data collection, without instructions; plain text output in 23 languages

Stock no. S55621-H125

Stock no. S55621-H125

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

  • Plain text output in bg, cs, de, dk, el, en, es, fi, fr, hr, hu, it, nl, no, pl, pt, ro, ru, sk, sl, sr, sv, tr

  • 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


Without instructions; plain text output in bg, cs, de, dk, el, en, es, fi, fr, hr, hu, it, nl, no, pl, pt, ro, ru, sk, sl, sr, sv, tr



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