A rule-based, system-level fault detection and diagnostic (FDD) method for HVAC systems was developed. It functions as an interface between multiple, equipment-specific FDD tools and a human operator. The method resolves and prioritizes conflicting fault reports from equipment-specific FDD tools, performs FDD at the system level, and presents an integratedr view of an HVAC system's fault status to an operator. A simulation study to test and evaluate the method was conducted.
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Schein et al. (2006) studied this question.