Formal commissioning is now an accepted practice and included in almost all new data center construction projects. The commissioning process has been described in various documents with perhaps the most definitive and authoritative being ASHRAE Guideline 0 “The Commissioning Process.”
With owners and developers now recognizing the value of employing formal commissioning to new construction, they are looking to apply these same processes to existing facilities. The industry has coined the terms “retrocommissioning” for commissioning existing facilities that were not commissioned when constructed and “recommissioning” when applied following significant modifications, upgrades, or expansions to previously commissioned sites.