The Viconics VZ7656 controller is specifically designed for RTU control of the Viconics Zoning System product family. The RTU controller is designed for single stage or multi-stage control of heating and cooling equipment such as rooftop and self-contained units used in zoning systems. The product features a backlit LCD display with dedicated function menu buttons for simple user operation. Accurate temperature control is achieved due to the product’s PI proportional control algorithm, which virtually eliminates temperature offset associated with traditional, differential-based controllers. The controller also contains extra digital inputs, which can be set by the user to monitor filter status or used as a general purpose service indicator. All models contain a SPST auxiliary switch, which can be used to control lighting or disable the RTU economizer function during unoccupied periods. It also features a discharge air sensor input. Proportional static pressure logic (input and output) has been integrated onto the controller to provide a complete single packaged unit for most small to medium size jobs. The controllers are used in conjunction with the Viconics VZ7260 Zone controllers for total system operation of each zones and the RTU. A local BACnet RS485 MS-TP communication bus between all devices insures proper communication and data exchange of all required information between the Zone controllers and the RTU controllers. They can be seamlessly integrated into any 3rd party BACnet supervision system. The second generation Viconics VBZS BACnet® Commercial Zoning System has been specifically designed to bring a simple scalable BACnet® zoning system solution to the commercial mid-market without the cost associated with a typical DDC zoning system. Our zoning system now provides even more flexibility by offering additional functionality and new models covering more applications while still achieving excellent energy savings. The new central models include rooftop and heat pump units controlling analog heat, CO2 levels and indoor air quality in conjunction with zoning controllers that provide floating and analog damper control. The most unique feature of the zoning system is its scalability; a single central controller unit can support up to 64 individual zone controllers. All zone controllers can be ordered with an on-board passive infrared (PIR) occupancy sensor cover that allows for advanced occupancy strategies. This enables the zone controllers to be able to provide even greater energy savings to zones during scheduled occupied events when no occupants are present. This automatic energy-saving feature reduces overall operating costs and accelerates return on investment. With exceptional system performance rivaling more costly and complex programmable automation systems, the VBZS can be installed at a fraction of the total cost of a comparable system. System installation, setup and commissioning have been simplified by eliminating the need for additional external commissioning equipment or tools. All required testing and configuration including addressing and zone-weighting is accomplished using the easy-to-read LCD interface provided on all controllers. Moreover, since no other programming tools are required, mechanical service technicians can quickly and easily install and service the system without costly support from other controls vendors. The VBZS offers unparalleled flexibility through the use of the open BACnet® communication protocol. The system can also be complemented with your choice of BACnet® controllers or graphical workstation software. BACnet® object mapping can also be accomplished seamlessly without the need for any complex programming tools.