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NC-2009 EAc3:Enhanced Commissioning

Supervising the Commissioning of 20% of the energy systems

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Maya Karkour
EcoConsulting
LEEDuser Basic Member
549 thumbs up

Hello, We are working on a project in which all the energy systems will be installed, tested and balanced by the general contractor. However, as per the requirements of this credit, the CxA will supervise and verify that the commissioning is being undertaken according to the procedures highlighted in the commissioning plan. The CxA, however, would like to know if the supervision/audit of 20% of all the commissioned is enough ? Is there a minimum percentage that should be respected? Many thanks,

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Chris Ladner
Partner
Viridian
LEEDuser Basic Member
154 thumbs up

Tue, 04/26/2011 - 12:48

There is no minimum percentage for sampling. The percentage should reflect a reasonable sampling of the equipment based on complexity, impact on energy use, impact on building operations, etc. We have seen rates from 10% -100%. Most large critical systems are 100% and terminal equipment (VAV boxes) can be from 10%-25%. Note that if problems are found with the sampled units you should expand your sampling to include more units to determine if you have a chronic issue.

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