Fault Detection and Diagnostics for AHUs and VAV Boxes

By Jeffrey Schein, Associate Member ASHRAE, and Steven T. Bushby, Member ASHRAE ASHRAE / 2005 / 6 pages

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Building HVAC equipment routinely fails to satisfy performanceexpectations because of improper installation, inadequatemaintenance, or equipment failure. These problems include mechanicalfailures such as stuck, broken, or leaking valves, dampers,or actuators; control problems related to failed or drifting sensors;poor feedback loop tuning or incorrect sequencing logic; degradedperformance caused by heat exchanger fouling; design errors; orinappropriate operator intervention.

Citation: ASHRAE Journal, Vol. 47, No. 7

Product Code(s): D-25933