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A system-level fault detection and diagnostic (FDD) method for heating, ventilation, and air conditioning (HVAC) systems was developed. It functions as an interface between multiple, equipment-specific FDD tools and a human operator. The method resolves conflicting fault reports from equipment-specific FDD tools, performs FDD at the system level, and presents an integrated view of an HVAC system's fault status to an operator. A simulation study to test and evaluate the method was conducted.doi:10.6028/nist.ir.7216 fatcat:dumbrhc2qzcndhhnsbm42gmr4e