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This study documents faults that are commonly found in small commercial buildings based on a literature review and discussions with building commissioning experts. It also provides a list of prioritized faults based on an estimation of the prevalence, primary energy impact, and financial impact of each fault. A total of 39 faults were analyzed for this paper and classified by location, stage, and type. The annual primary energy impact (AEIprimary) and annual financial impact (AFI) of each fault were estimated based on available information. Based on these estimates, 20 top priority faults were identified. Eight out of the 20 top priority faults occur in vapor compression systems such as airconditioning, heat pump, and refrigeration equipment. Nonstandard refrigerant charging, condenser fouling, and evaporator fouling are the most important faults for this type of equipment.

Common Faults and Their Prioritization in Small Commercial Buildings: February 2017 - December 2017