What is Retro-Commissioning (RCx)? Retro-Commissioning is similar to standard Commissioning. The main difference is when Retro-Commissioning is done. Commissioning is done at the end of a new construction project or a retrofit project. Retro-Commissioning is done some time later, long after the project has been completed and the warranty is over.
Why should you consider Retro-Commissioning? All system deteriorate over time. Equipment breaks, setpoints are changed, points are locked, sensors fail, schedules change, and on and on. Many times when these things take place, energy is being wasted. Retro-Commissioning compares how a building is being operated to the original intent. Sequences are tested, and points are checked for proper operation. After the examination of the systems has taken place, the RCx Agent will create a report that list all of the deficiencies found. The owner should be prepare to fix these items so that their system can begin working as designed once again. The RCx Agent may also make suggesting to improve sequences and scheduling that could further save energy. It has been estimated that the average RCx project pays for itself in less than 18 months.
How often should my system be Retro-Commissioned? I would recommend that somewhere between 5 and 7 years depending upon how well your system is maintained, you would benefit from a Retro-Commissioning project. You could even do mini RCx projects more often that insure that all systems are functioning properly. Data Centers often times do annual point to point checkouts due to the importance of the buildings function.