Engineered Systems - August 2008 - (Page 10)

Back 2 Basics Based on Cx-3 ATC/FPT software BY HOWARD MCKEW, P.E., C.P.E. Engineering in the Construction Phase • The designer should manage the design phase fee so that he has adequate funds to participate in the field coordination drawing phase of construction. Refer to “Design & Construction Administration for the 21st Century” in the August 2007 issue of Engineered Systems for more information • The design engineer should request the equipment O&M manual for the associated piece of equipment immediately after the shop drawing has been approved so that the facility manager can begin the process of building the PM workorder system in the first quarter of the construction phase. For this B2B application, it is assumed there will be in-house maintenance so the facility manager should use a CMMS system. • The design engineer should use standardized equipment checklists (refer to “HVACR Designer Tips” for construction observation) for documenting installation progress, system readiness, and the final punchlist. This electronic equipment checklist can be linked to the CMMS asset database and given to the facility manager at the end of the job. • The design engineer should document installation progress using a digital camera combined with the construction drawing detail to document contract compliance. • Consideration should be given to the use of “smart software” (e.g., Cx-3 software) that provides the ability to print out each sequenceby-sequence flow diagram along with the associated ATC/FPT checklist which can then be laminated and put into an operator’s handbook along with OPR and BofD for quick reference, troubleshooting, and future recommissioning. This handbook should be located at the unit along with electronic copy linked to the CMMS asset database. This same program can be used by the TAB firm when they create their system flow diagram documenting the flows, velocities, pressure drops, etc., and laminated and saved within the operator’s handbook. • The design engineer should invest at least one day for system training, using the operator handbooks to educate the owner and associated HVAC service contractor leading up to the building system commissioning, highlighting the BofD, and estimated energy budget. • The commissioning engineer should produce a commission test plan and schedule spreadsheet which should be used by the contractor to fill in the target dates and completion dates for tasks. The PFPT team should include the contractor (general contractor or construction manager), HVAC contractor, ATC installer and programmer, electrical contractor, TAB engineer, equipment manufacturers (e.g., AHU-1), and facility operating group. In many installations, the automatic control computer software may be furnished on the unit (e.g., AHU-1 control panel CP-1) and programmed by the equipment manufacturer. • The ATC program associated with the building system sequence of operation should be closely reviewed, tested, and finalized prior to demonstrating the system performance to the commissioning team. When commissioning the computer software programs, it is important that the commissioning engineer have access to the flow diagram (control logic) as part of the FPT procedures. • The TAB engineer, in the shop drawing phase, shall submit the system flow diagram with design data, along with the final TAB report table of contents and other pertinent documents outlined in the Division 19000 specification. • The TAB engineer shall participate in the field coordination drawing phase and sign off on TAB-ability. • The TAB engineer shall provide pre-TAB site inspection reports along with standard observation checklists and digital photographs of installation status. • When demonstrating the FPT, the facility operators should be participating to receive on-the-job system training. While observing the system performance, the O&M manual and PM workorders should be reviewed. • When observing the gymnasium system FTP, the commissioning team will need to have a commissioning engineer at the building automation control panel/computer and another commissioning engineer or technician at the end devices to observe action-reaction. Third-Party Cx and TAB Engineering in the Construction Phase • Those who contract for commissioning serves in the construction phase of the job usually interpret commissioning as being startup. When the commissioning firm is hired to perform FPT, experience has shown that this approach to commissioning is really enhanced startup. Commissioning should begin in the schematic phase of a building program. • The commissioning engineer shall facilitate a specific number of commissioning team meetings along with distribution of meeting minutes. This engineer shall also participate in system readiness site visits and issue field visit reports along with completed observation checklists and digital photographs. • Prior to the FPT demonstration to the owner, the contractor is required to complete the PFPT, better known as equipment and system startup. 10 En gi neer ed S y stem s August 2008 http://SubscribeForFree.com

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Engineered Systems - August 2008 Contents Editor's Note Back2Basics HVAC Challenge Case In Point Commissioning Building Automation Efficiency Incentives HVACR Designer Tips Glass Box to Grand Casino Looking Radiant In Green Mechanical Products Sourcebook Q&A: Dehumidification In Schools Building Oversight Management: M&V And More Products Classifieds Advertiser Index Tomorrow's Environment

Engineered Systems - August 2008

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