Classification of sequencing logic faults in multiple zone air handling units: A review and case study

This paper classifies common sequencing logic faults in multiple zone variable air volume (VAV) air handling unit (AHU) systems by conducting a critical review of the literature. Six broad categories of sequencing logic faults are identified affecting the state of operation, mode of operation, and s...

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Bibliographic Details
Published in:HVAC&R research 2022-05, Vol.28 (5), p.577-594
Main Authors: Gunay, Burak, Torabi, Narges, Shillinglaw, Scott
Format: Article
Language:English
Subjects:
Air temperature
Building management systems
Fault detection
Faults
Literature reviews
Logic
Static pressure
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Summary:This paper classifies common sequencing logic faults in multiple zone variable air volume (VAV) air handling unit (AHU) systems by conducting a critical review of the literature. Six broad categories of sequencing logic faults are identified affecting the state of operation, mode of operation, and supply air temperature and duct static pressure setpoint reset programs. A case study with building automation system (BAS) trend data from two VAV AHU systems is conducted to provide examples of these sequencing logic faults. Four of the six fault types are found present in at least one of the two AHUs. The most significant fault discovered was an incorrect reference to a nonexistent VAV terminal damper address forcing an unnecessarily high duct static pressure setpoint and wasting fan electricity. The BAS programs are reviewed in consultation with the operations staff, and the coding mistakes leading to the detected anomalous behavior are identified.
ISSN:2374-4731
2374-474X
DOI:10.1080/23744731.2022.2058262