This December 2020 report by Dennis Krieger of Clockworks Analytics and James Dice of Nexus Labs examines and compares the range of tools available to O&M teams, from building automation system (BAS) alarms to fault detection and diagnostics (FDD). This paper tells the story of that second “D” and why it is so important. To illustrate, the example of a large air handling unit experiencing several issues is examined. The paper concludes by issuing a challenge to the industry: building owners need FDD, not just FD.
Key words: artificial intelligence (AI), cloud and data analytics, HVAC, large building controls, Internet of things (IOT), installation equipment/diagnostics, fault detection, energy management, alarms