Evaluation of an AHU Fault Detection Scheme Based on Finite State Machine Sequencing Control

This report describes a new method for integrated control and fault detection of AHUs that addresses the challenges of requiring that steady-state conditions prevail prior to invoking an FDD method can be problematic because poor control frequently leads to unsteady behavior; the lack of standard control sequences for central air-handling units (AHUs), which results in the need to customize FDD methods to accommodate the nuances of individual units; data handling and storage problems; and data collected for off-line processing can be difficult to obtain and cumbersome to store.