Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Application of Control Charts for Detecting Faults in Variable-Air-Volume Boxes



J Schein


This paper describes a fault detection method developed for application to variable-air-volume (VAV) boxes. VPACC (VAV Box Performance Assessment Control Charts) is a fault detection tool that uses a small number of control charts to assess the performance of VAV boxes. The underlying approach, while developed for a specific type of equipment and control sequence, is general in nature and can be adapted to other types of VAV boxes. VPACC has been tested using emulation, laboratory, and field data sets. The results are encouraging. VPACC successfully detected each of the faults introduced in the emulation and laboratory testing, and also detected two faults that were not intentionally implemented. In addition, no false alarms were identified in the emulation and laboratory testing. The assessment of VPACC with field data was not as straightforward; however, VPACC alarms for the field data do seem to point to several design and operational issues.
Ashrae Journal


building automation and controls, controls, VAV equipment


Schein, J. (2003), Application of Control Charts for Detecting Faults in Variable-Air-Volume Boxes, Ashrae Journal, [online], (Accessed April 20, 2024)
Created July 31, 2003, Updated February 17, 2017