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Southern Human Services Center Smith Sinnett /2020072 <br />HVAC and Roof Renovations Orange County,North Carolina <br />BAS DIRECT DIGITAL CONTROL SYSTEM <br /> 23 09 02 - 5 <br />2.05 BUILDING CONTROLLERS <br />A.Building Controllers shall be 32 bit,multi-tasking,multi-user,real-time 48 MHz digital control <br />processors consisting of modular hardware with plug-in enclosed processors,communication <br />controllers,power supplies and input/output point modules. Controller size shall be sufficient to <br />fully meet the requirements of this specification and the attached point list. <br />B.Each Building Controller shall support a minimum of 3 directly connected Secondary Networks. <br />C.Each Building Controller shall support firmware upgrades without the need to change hardware. <br />D.Spare Point Capacity. <br />1.Each Building Controller shall have a minimum of 10 percent spare point capacity. <br />2.The type of spares shall be in the same proportion as the implemented I/O functions of the <br />panel,but in no case shall there be less than one spare of each implemented I/O type. <br />3.Provide all processors,power supplies,and communication controllers so that the <br />implementation of adding a point to the spare point location only requires the addition of the <br />appropriate: <br />a.Expansion modules <br />b.Sensor/actuator <br />c.Field wiring/tubing. <br />2.06 APPLICATION SPECIFIC CONTROLLERS (ASC) <br />A.General <br />1.Each Building Controller shall be able to communicate with application specific controllers <br />(ASCs)over the Secondary Network to control terminal equipment only. <br />2.Each ASC shall operate as a stand-alone controller capable of performing its specified control <br />responsibilities independently of other controllers in the network.Each ASC shall be a <br />microprocessor-based,multi-tasking,real-time digital control processor. <br />3.Communication.Each controller shall perform its primary control function independent of <br />other Secondary Network communication,or if Secondary Network communication is <br />interrupted.Reversion to a fail-safe mode of operation during Secondary Network interruption <br />is not acceptable. <br />4.Control Algorithms.The controller shall receive its real-time data from the Building Controller <br />time clock to insure Secondary Network continuity. Each controller shall include algorithms <br />incorporating proportional,integral and derivative (PID)gains for all applications. All PID <br />gains and biases shall be field-adjustable by the user via room sensor LCD or the portable <br />operator’s terminal as specified herein. Controllers that incorporate proportional and integral <br />(PI)control algorithms only shall not be acceptable. <br />5.Control Applications.Operating programs shall be field-selectable for specific applications. In <br />addition,specific applications may be modified to meet the user's exact control strategy <br />requirements,allowing for additional system flexibility.Controllers that require factory <br />changes of all applications are not acceptable. <br />6.Calibration.Each controller shall include provisions for manual and automatic calibration of <br />the differential pressure transducer in order to maintain stable control and insuring against <br />drift over time. <br />PART 3 EXECUTION <br />3.01 PROJECT MANAGEMENT <br />A.Provide a designated project manager who will be responsible for the following <br />1.Construct and maintain project schedule <br />2.On-site coordination with all applicable trades,subcontractors,and other integration vendors <br />3.Authorized to accept and execute orders or instructions from owner/architect <br />4.Attend project meetings as necessary to avoid conflicts and delays <br />5.Make necessary field decisions relation to this scope of work <br />6.Coordination/Single point of contact <br />DocuSign Envelope ID: 94E7997D-4F29-42F6-A9B4-0A160438D2A6