Viconics VBZS Engineering Guide Specifications - Manual (Page 2)

Viconics BACnet Zoning System Engineering Guide Spec
1.01 System Description – The Viconics BACnet Zoning System (VBZS) shall provide a simple and
efficient demand based system for the operation of changeover bypass or pressure dependent type
zoning systems utilizing standard 2 heat / 2 cool configurations, 2 heat / 2 cool with economizer and IAQ,
analog heat/2 cool, or heat pump 3 heat/ 2cool. The system shall consist of two primary components as
manufactured by Viconics: A communicating rooftop unit controller / heat pump controller (model
VZ7656x1000B) and one/several communicating zone controllers (model VZ7260x5x00B). A local
BACnet MS_TP communication bus between all devices shall ensure proper communication and data
exchange of all required information between the zone controllers and the rooftop unit controller for
proper system operation. The system shall seamlessly integrate into any 3
rd
party BACnet supervision
system adding greater functionality without being limited to a single vendor. Controls that can only be
integrated into a proprietary non-open protocol network shall not be acceptable. All system configuration
tools shall be embedded within the local devices via real text configuration interface. Systems requiring
external tools for commissioning or configuration shall not be acceptable.
1.02 Quality Assurance - The control system shall be manufactured within a systems certified ISO-9001
and ISO-14001. Please see the Equipment section for industry approvals and specifications.
Part 2 – Equipment
2.01 General - The VZ7656x1000B Rooftop controller shall be designed for equipment control based on
heating and cooling demands from the zone controller(s) (VZ7260). The packaged rooftop or heat
pump system controller VZ7656 shall also provide logic and required inputs/outputs to control system
specific static pressure. The VZ7260F5x00B zone controllers shall be designed for local pressure
dependent VAV control.
Communication Protocol – The control system shall communicate using the open-protocol BACnet
MS_TP over RS485. Zone controls shall be configured directly from the local keypad to communicate with
a specific Rooftop Unit controller. All zone and Rooftop Unit controllers must reside on the same network.
All controllers in the network shall communicate at the same baud rate in order to properly exchange
information. Baud rate for system shall be set at Rooftop/system controller (VZ7656). Zoning control
controller shall feature “Auto-baud capability” allowing system baud rate configuration from Rooftop
controller to be matched by zoning controller(s) thereby facilitating system configuration and
commissioning.
Scalability – The system shall be fully scalable in terms of number of zone controllers and Rooftop Unit
controllers used on the same BACnet MS_TP communication trunk. A segment shall be a shielded
network loop run between all communicating device connections. The segment shall be no longer than
1200 meters (4000 feet). A single network segment shall be capable of installing up to 64 nodes (of either
type of controller). To install more than 64 nodes or if the network wire loop is longer than 1200 meters