Specifications - City of Montpelier, Vermont

Montpelier District HeatingCity of Montpelier, VTIssue Date:September 28, 2012Title:15900 – Direct Digital Control SystemPage #:2 of 401.3 SUBMITTALSA. General:1. Submit in accordance with Section 01340, “SUBMITTALS.”2. Show the complete system architecture.3. The control drawings shall have a key to all abbreviations.B. Description1. General: The control system shall consist of a highspeed, peertopeer networkof DDC controllers and a webbased operator interface. Depict each mechanicalsystem and building floor plan by a pointandclick graphic. A web server with anetwork interface card shall gather data from this system and generate webpages accessible through a conventional web browser on each PC connected tothe network. Operators shall be able to perform all normal operator functionsthrough the web browser interface.2. The system shall directly control HVAC equipment as specified in 15910. Eachzone controller shall provide occupied and unoccupied modes of operation byindividual zone. Furnish energy conservation features such as optimal start andstop, night setback, requestbased logic, and demand level adjustment ofsetpoints as specified in the sequence.3. System shall use the BACnet protocol for communication to the operatorworkstation or web server and for communication between control modules. I/Opoints, schedules, setpoints, trends, and alarms specified in 15910 shall beBACnet objects.C. Hardware1. Provide a complete set of control drawings using electronic computer basedformat. Include the following information:a. Show general physical arrangement of component devices installed inthe panels.b. Provide a typical schematic drawing of each control circuit.DIRECT DIGITAL CONTROL SYSTEMS159722