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What is an optimal life cycle for a typical BAS? In other words, if your BAS is X-years old, it's time to start shopping for a replacement.
A typical optimal life cycle for BAS is between seven and ten years. After seven years, BAS become very difficult to support and with proprietary based control networks, can be made to be functionally obsolete by being incompatible with the next generation product line(s).The degree of BAS replacement at year seven needs be defined by the professional conducting the life cycle cost analysis. This issue is dependent on whether the existing system is based on an open control network standard or is a vendor proprietary control network. A worst case scenario would be for the proprietary control network requiring complete replacement (100 percent) and a best case scenario would be no system replacement with the open standards based control network (because of existing system compatibility with the next generation BAS components). Answers by Raed Salem, director of MEP Engineering, Larson & Darby Group.
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