User Manual

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Heating, ventilation and air conditioning - room temperature control
Other products
Central control unit RMB795B-1
Siemens Switzerland Ltd
Building Technologies Division
2019www.siemens.com/gamma
7
Stock No. Product No. DT
S55370-C162 RMB795B-1 A
RMB795B-1 Central control unit for room controllers and room thermostats
• Central control unit with integrated control and supervisory functions for individual room control with
RXB room controllers and room thermostats RDG/RDF/RDU
• Central collection of heating and cooling demands from any KNX room controllers
• Control of any HVAC primary controllers in dependence on the received and calculated heating/cooling
demands
• Individual time programs for room groups
• Preselected operating modes and setpoints‚ minimum / maximum temperature supervision and
supervision of RXB room controllers and room thermostats RDG/RDF/RDU
• Trend and fault reporting functions for the input variables temperature‚ relative / absolute humidity‚
pressure / differential pressure‚ volumetric air ow‚ indoor air quality‚ etc.
• Heating / cooling changeover function for operation with 2-pipe systems
• Flexible conguration
• Clear-text operation with separate operator unit (plug-in type or detached)
• Integrated KNX bus communication
• No commissioning tool required
The RMB795B-1 supports the languages: English, German, French, Italian, Spanish, Portuguese, Dutch,
Danish, Finnish, Norwegian, Swedish, Polish, Czech, Hungarian, Russian, Slovak, Bulgarian, Greek,
Romanian, Slovenian, Serbian, Croatian, Turkish, Chinese.
Extension modules complement the central control unit and offer extra functions. They are attached to
the controller via plug-in connectors. The extension modules do not operate autonomously.
The operation of the device from commissioning to enduser operation can be done via the operator unit.
Available extension modules:
• 1 universal module RMZ785
• 2 universal modules RMZ787
A total of 3 extension modules can simultaneously be used with the central control unit.
Available operator units:
• Plug-in type operator unit RMZ790
• Detached operator unit RMZ791
• Bus operator unit RMZ792
Data sheet N3122
Operating voltage AC 24 V
Frequency 50/60 Hz
Power consumption 12 VA
Communication KNX (KNX TP1)
Analog outputs, number 2
Analog output, signal DC 0...10 V
Analog output, current Max. 1 mA
Universal inputs, number 6
Universal input, signal 2 x LG-Ni1000
DC 0...10 V
Potential-free digital status contact
LG-Ni1000
Pt1000
T1 (PTC)
Relay outputs, number 4
Relay output, switching voltage AC 19...250 V
Relay output, switching current 4 (3) A
Degree of protection IP20
Dimensions (W x H x D) 173 x 90 x 80 mm
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