2024-390-E-AMS-Brady Services-WCOB Server Room HVAC

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Orange County West Campus Office Building -HVAC PDC Project 23020 BAS DIRECT DIGITAL CONTROL SYSTEM 23 09 02 - 4 2.It shall be possible to use any system measured point data or status,any system calculated data,a result from any process,or any user-defined constant in any controller in the system. 3.Any process shall be able to issue commands to points in any and all other controllers in the system. 4.Processes shall be able to generate operator messages and advisories to other operator I/O devices. A process shall be able to directly send a message to a specified device or cause the execution of a dial-up connection to a remote device such as a printer or pager. 5.Each controller shall support plain language text comment lines in the operating program to allow for quick troubleshooting,documentation,and historical summaries of program development. 6.Controller shall provide a HELP function key,providing enhanced context sensitive on-line help with task oriented information from the user manual. 2.04 BUILDING CONTROLLERS A.Building Controllers shall be 32 bit,multi-tasking,multi-user,real-time 48 MHz digital control processors consisting of modular hardware with plug-in enclosed processors,communication controllers,power supplies and input/output point modules. Controller size shall be sufficient to fully meet the requirements of this specification and the attached point list. B.Each Building Controller shall support a minimum of 3 directly connected Secondary Networks. C.Each Building Controller shall support firmware upgrades without the need to change hardware. D.Spare Point Capacity. 1.Each Building Controller shall have a minimum of 10 percent spare point capacity. 2.The type of spares shall be in the same proportion as the implemented I/O functions of the panel,but in no case shall there be less than one spare of each implemented I/O type. 3.Provide all processors,power supplies,and communication controllers so that the implementation of adding a point to the spare point location only requires the addition of the appropriate: a.Expansion modules b.Sensor/actuator c.Field wiring/tubing. 2.05 APPLICATION SPECIFIC CONTROLLERS (ASC) A.General 1.Each Building Controller shall be able to communicate with application specific controllers (ASCs)over the Secondary Network to control terminal equipment only. 2.Each ASC shall operate as a stand-alone controller capable of performing its specified control responsibilities independently of other controllers in the network.Each ASC shall be a microprocessor-based,multi-tasking,real-time digital control processor. 3.Communication.Each controller shall perform its primary control function independent of other Secondary Network communication,or if Secondary Network communication is interrupted.Reversion to a fail-safe mode of operation during Secondary Network interruption is not acceptable. 4.Control Algorithms.The controller shall receive its real-time data from the Building Controller time clock to insure Secondary Network continuity. Each controller shall include algorithms incorporating proportional,integral and derivative (PID)gains for all applications. All PID gains and biases shall be field-adjustable by the user via room sensor LCD or the portable operator’s terminal as specified herein. Controllers that incorporate proportional and integral (PI)control algorithms only shall not be acceptable. 5.Control Applications.Operating programs shall be field-selectable for specific applications. In addition,specific applications may be modified to meet the user's exact control strategy requirements,allowing for additional system flexibility.Controllers that require factory changes of all applications are not acceptable. 6.Calibration.Each controller shall include provisions for manual and automatic calibration of the differential pressure transducer in order to maintain stable control and insuring against drift over time. Docusign Envelope ID: 8DED1454-68D2-4E36-9FC6-E56FF2124E5D