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NC-2009 EAc3:Enhanced Commissioning

Stair Pressurization Fans and Booster pumps

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Bob Crowell
Vice President / Principal
2rw Consultants, Inc.
LEEDuser Basic Member
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Are the following systems required to be tested under the LEED Commissioning Scope? 1. Stair Pressurization Fans 2. Domestic Water Booster Pumps 3. Grey water reuse system Thank you,

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Scott Bowman
LEED Fellow
Integrated Design + Energy Advisors, LLC
LEEDuser Expert
377 thumbs up

Wed, 05/29/2013 - 21:11

Stair Pressurization could be in a little bit of a gray area, but my question would be why would an owner NOT want to confirm that that system is operating as designed. The water booster and grey water systems definitely need to be in the scope.
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Steve Samenski
Commissioning Project Engineer
TLC Engineering for Architecture
LEEDuser Basic Member
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Thu, 07/11/2013 - 15:21

Scott -- I would agree with you that an owner should benefit from commissioning these systems, however, I interpret the LEED Cx scope differently. The reference guide language mentions only "domestic hot water systems", not booster pumps or gray water. I've always drawn the line that way (insofar as LEED requires): hot water equipment in, domestic booster pumps, gray water, rain water collection, etc, out. Have you gotten more sweeping direction from GBCI as part of a CIR or similar?
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Scott Bowman
LEED Fellow
Integrated Design + Energy Advisors, LLC
LEEDuser Expert
377 thumbs up

Fri, 07/12/2013 - 14:49

Steve – I have not gotten any direction that way, and you are right there is a lot of room for interpretation. Really, about the only comments we have ever gotten after a lot of LEED Cx projects related only to getting owner signatures in v2009. It would be interesting to know what kinds of questions and clarifications have happened with projects.
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Peter Dishno
Commissioning Engineer
LEEDuser Basic Member
15 thumbs up

Fri, 07/12/2013 - 14:56

I have always commissioned the booster pump because I consider it a part of the buildings 'energy systems'. The differential pressure setpoint for this pump can have a big impact on energy usage. LEED does call out for energy related systems to be commissioned. (I apologize if that is not the exact wording in the book) I believe graywater, sump pumps, sewage ejectors (etc...) do not apply as an energy system.

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