Building Technologies Desigo™ RXC Room automation system System description Version 5 and later
Contents Comfort and well-being in every room ........................................................................ 4 Range overview ............................................................................................................. 5 The room controllers ..................................................................................................... 6 The room units: the key to individual comfort........................................................... 8 Applications ...................
Comfort and well-being in every room Most people in the industrial world spend some 90% of their time indoors. About one third of this time is spent at work. Against this background, it is clear that good indoor air quality, the right temperature and draught-free air renewal are vital prerequisites for motivation and a sense of well-being. The Desigo RXC room automation system provides individual demand-based comfort for the users of public buildings, offices, schools, hotels, etc.
Range overview Desigo RXC is an innovative range of room controllers, extension modules and room units. Data communications are based on LONW ORKS technology. The Desigo RXC hardware The range comprises compact and modular room controllers, easy-to-operate room units and controllers in room-style housings. The input and output configurations of the controllers, and the style of housing are optimized for each specific field of application.
The room controllers RXC10, the room controller in a room-style housing: This controller is a cost-effective combination of a room unit and an HVAC controller. It is particularly suitable for radiator-and-chilled-ceiling applications, and for simple VAV systems. RXC20, RXC21, RXC22 and RXC39 compact room controllers The input / output configuration and mounting options of these controllers make them ideal for fan coil applications.
Connections / functions RXC.10 RXC31 RXC32 RXC39 Power supply AC 24 V AC 230 V AC 230 V AC 230 V AC 230 V AC 24 V LON bus (LONMARK compatible) PPS2 interface for standard room unit (PPS2) Socket for commissioning and service tool RXC20 RXC21 RXC22 AC 24 V AC 24 V Plug-in connection between basic module and extension modules Digital inputs 1) 2 Analog input for LG-Ni 1000 temp.
The room units: the key to individual comfort The room units in the Desigo RXC range cover a wide variety of needs represented by the various room occupants. When designing these stylish room units, the designers also paid special attention to ergonomic factors.
Conventional room units HVAC Integrated room units HVAC, lighting and blinds HVAC, lighting and blinds LON-Bus QAX3... QAX8... QAX9... QAX3... QAX8... QAX9... Aut o - + RXC20.. RXC21.. RXC22.. RXC30.. RXC31.. RXC32.. RXC38.. RXC39.. QAX50.. QAX51.. A u to Aut o - + RXC30.. RXC31.. RXC38.. RXC39.. + RXC40.. + RXC41.. RXC30.. RXC31.. RXC38.. RXC39.. + RXC40.. + RXC41.. 10333z01en_02 QAX30.1, QAX31.
Applications The scope of the Desigo RXC range is defined by the pre-programmed application software. The next pages provide an overview of the options available and the devices required. The applications can be downloaded with the RXT10 commissioning and service tool, which contains the complete applications library. Due to intelligently defined default values in the applications, engineering involves simply determining a small number of parameters, e.g.
VAV systems (examples) 70224 Appl. Description Controller VAV01 VAV02 VAV03 VAV04 VAV05 Single duct supply or extract air system Single-duct supply air system with re-heater / cooler Single-duct supply air system with electric re-heater Single duct supply and extract air system Single duct supply and extract air system with re-heater / cooler Single duct supply and extract air system with electric re-heater RXC10 / RXC32 RXC32 RXC32 RXC31 RXC31 VAV06 T LON RXC31 etc.
Combined applications The HVAC applications covered by the modular RXC30, RXC31 and RXC39 controllers can be combined with lighting and blind control (extension modules RXC40 and RXC41). The combined application consists of an HVAC application and one or more electrical functions. Examples: Lighting on/off1) T LON Room controller + extension modules Controller Lighting dimming Blind up/down2) RXC41 Electrical function RXC40 HVAC Appl. RXC31 Appl.
Installation 70227 Example: RXC20 with terminal covers The room controllers in the Desigo RXC range are designed for various types of installation: • In fan coil units (mounted with screws or on DIN rails) • In control panels (on DIN rail) • In ceiling voids • Under floors • In sill or floor ducting • On VAV boxes • On flush-mounting boxes (RXC10, QAX.50 / 51) Terminal covers are required when mounting the controllers outside control panels or fan coil units (see page 21, accessories).
Engineering and commissioning In the engineering phase, the number of devices, their application and the LONMARK bindings between devices, and between these devices and any third-party equipment are determined according to the distribution of rooms and zones in the building. The network structure defined at the engineering stage (applications, parameters, LONMARK bindings etc.) is mapped to the devices in the commissioning phase.
Parameter setting Each application has a number of parameters, such as temperature setpoints, type of output sequence (2-position or 3-position), type of fan control etc. These parameters are now adjusted according to requirements. In most cases, however, the factory default settings can be retained. Setting the temperature setpoints Communication bindings The bus communications in the Desigo RXC range are based on LONW ORKS technology.
Addressing The physical identification number (neuron ID) of each device (Desigo RXC or a LONMARK-compatible third-party device) must be modified to match the logical address (e.g. location) in the network structure. The RXT10 tool offers various options for efficient addressing. Loading the network structure The network structure (applications, parameters, LONMARK bindings) must now be mapped in the individual devices: On site, this can be carried out from any point on the LON bus.
Integration into the building automation and control system DESIGO INSIGHT Management level DESIGO INSIGHT PXM20-E BACnet / Ethernet / IP PXM20 Automation level BACnet / LonTalk PXX-Lxx BACnet / LonTalk PXX-Lxx PXC200-E.D PXC....D modular PXC....D modular PXC22.D LONMARK / LonTalk PPS2 Room level QAX... RXC... RXC... QAX5... LONMARK-compatible third-party devices 10333Z02_01 Stand-alone operation at field level The Desigo RXC room automation system can be operated as a stand-alone system.
Integration into the management level Because it is integrated into the automation level, the room level can also be displayed and operated at the management level. Desigo Insight is the Windows-based management station within the Siemens building automation and control system. With its modular structure it covers every level of complexity - from small buildings to large building complexes and geographically separate buildings For more information refer to the Desigo system description, document CM110660.
Time schedules for building use and room occupancy One option which is frequently employed at the automation level or in the Desigo Insight management station is the use of central Building use and Room occupancy time schedules. These make it possible to optimize the supply of energy to match varying periods of room occupancy. The Building occupancy time schedule determines the overall period of time during which the building is in use. Outside this period, the plant (e.g.
Overview of the Desigo RXC equipment Desigo RXC controllers Documentation RXC10 Room controller in room-style housing for chilled ceilings, radiator-type heaters and VAV systems (supply or extract air) CA2N3830 RXC20, RXC21, RXC22 Room controllers for fan coil systems, chilled ceilings and radiator-type heating CA2N3834 RXC30 Room controller for radiators and chilled ceilings, with lighting control CA2N3840 RXC31 Room controller for VAV systems (supply and extract air) CA2N3844 RXC32 Room con
Desigo RXC system controllers and tools for commissioning and service Documentation PXC….D, PXC…-E.D Automation stations, modular series CM1N9222 PXX-L11, PXX-L12 Extension modules (integration of 60 / 120 RXC room controllers) CM1N9282 PXR11, PXR12 *) System controllers (integration of 60 and 120 RXC room controllers respectively) CA1N9235 RXT10.3 Commissioning and service tool (software) for maintenance of projects with integration via NIDES or PXR11, PXR12 CM110669 RXT10.
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