Retrocommissioning Gets Results

EnergywithwordsMcKenney’s dramatically improved energy efficiency at a corporate campus in Atlanta, following an HVAC system and controls retrocommissioning.

The Challenge

The system and older pneumatic controls were not functioning properly, and as a result, occupants were uncomfortable and they were consuming too much energy. Air compressors ran constantly due to leaks, several chilled water valves were not calibrated correctly and a variable frequency drive (VFD) on one air handling unit was running in bypass. In addition, the building owner did not have a clear understanding of occupancy schedules.

The Solution

The team repaired and replaced major leaks throughout the compressed air system, cutting run time in half and raising the air pressure to an acceptable level. Leaking chilled water valves were fixed, faulty VFD wiring was repaired and pneumatic controls, stats and sensors were recalibrated. The team also set controls to shut down areas of the building that did not need 24/7 conditioning.

The Results

The building is consuming 20 percent less energy—saving the company $120,000 annually—and attaining a projected two year payback in just twelve months.

About Kumba McCritty


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Kumba McCritty began at McKenney's in 2011 as a Marketing Specialist. Upon graduating from Fordham University, she has worked in sales, account management and marketing. Kumba enjoys being challenged professionally while also having the opportunity to grow in her position at McKenney’s. This growth has allowed her to become a Proposal Specialist, where she continues to be vital piece of the McKenney’s marketing team.

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