HHB Engineers, P.C. was awarded a 3-year Indefinite Delivery Contract with the VA Medical Center in Birmingham, Alabama. One of the projects included installation of variable speed drives at air handling units throughout the complex equipped with inlet guide vanes. During field surveys, many of teh guide vanes were found to be “frozen” at some point of operation. As part of the VFD upgrade, the guide vanes were removed. In attidion, VFDs with 4-20 ma dc signals were specified with appropriate pneumatic-to-electroic (I/P) transducers installed. Most of the fan motors were suitable for VFD application, and only a few motors were required to be replaced.
Construction cost: $450,000