Consulting Specifying Engineer Consulting-Specifying Engineer (November-CSE) : Page-16

MEP Roundtable vary slightly between the average build-ing and a sustainable design, the steps to ensuring that both operate as efficiently as possible are the same. The most impact that you can have as a designer is to pro-vide proper service clearances and access to the equipment to enable the building staff to perform their duties. Proper main-tenance of the building systems leads to increased efficiency, increased perfor-mance, and most importantly, increased occupant comfort. Smith: It is important that the facil-ity staff understand and are comfortable with how the system should function. Every system will require maintenance and monitoring. We do retro-commis-sioning and one of the biggest issues is that staff have modified the systems to something other than the design intent due to a lack of knowledge of how it is supposed to work. Many of these sys-tems in their current state actually are costing the facility over a conventional system rather than saving energy/money. CSE: What are some common problems you encounter when work-ing on building automa-tion systems (BAS)? Najafi: The human fac-tor is the unpredictable element of the equation. Control systems and soft-ware have become fairly complex and require basic computer skills from the control operator. While control graphic interface has greatly simplified the inter-action of the operator with the control software, understanding the way the system operates or reacts to an opera-tor’s input remains the biggest problem of system performance. Providing a self-sustained and self-correcting control sys-Figure 3: The team from Global Engineering Solutions installed a 400-amp feeder to power new computed tomography equipment at the University of Maryland Medical Center. Staff determined the originally des-ignated panel was not appropriate, and had to draw power from a substation located away from the project to complete work. The challenge was to figure out the distribution in the field without single-line or riser dia-gram drawings of the existing system. Courtesy: Global Engineering Solutions tem requiring minimum interaction with maintenance personnel will reduce some of the most common problems of control malfunctioning. Banse: One problem is integration with fire alarm systems, which of the two systems actually “controls” HVAC functions and dampers, along with which MaxGard ® Heavy Industrial ANNOUNCING OUR NEWLY EXPANDED RUSSELLSTOLL ® PIN AND SLEEVE LINEUP. T&B announces the addition of ABB IEC-rated plug and socket systems to our pin and sleeve Complete DuraGard ® Waterproof ABB IEC 60309 International Compliance Russellstoll, MaxGard, and DuraGard are registered trademarks of Thomas & Betts Corporation. interconnection lineup. So now, in addition to proprietary Russellstoll ® MaxGard ® and DuraGard ® systems, you can get the IEC 60309 compliance and interchangeability of ABB’s global lineup. For all of your light-and heavy-duty pin and sleeve needs, plug into the power of T&B. Contact your T&B representative or visit us at tnb.com/Russellstoll. input #12 at www.csemag.com/information

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