We are working on a retail project and the mechanical designer insists on using a split VRF system. However the Mitsubishi systems he recommends do not meet the allowable refrigerant/ton set out by LEED. Does anyone have any advice on what systems/manufactures can be used or how to accommodate a VRF only building for this credit?

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Tristan Roberts

Representative

Vermont House of Representatives

LEEDuser Expert

7780 thumbs up

Mon, 11/30/2015 - 23:33

Kristopher, my understanding is that VRF systems can be a challenge under this credit because of the relatively large volume of refrigerant used in the piping. Hopefully the efficiency is helpful in earning points under EAc1. I don't have any specific tips, but I'll ask around. And please post back if you've found anything workable.

Steve Loppnow

Sustainability Account Manager

Stok

LEEDuser Expert

177 thumbs up

Wed, 12/02/2015 - 23:37

Any split system will require a significant amount of refrigerant, which due to quantity may mean this credit is not achievable. Unless a different manufacturer specifies a different refrigerant with a lower impact, a split system may not align with pursuing this credit. If you do consider a different system type that requires less refrigerant, there may be an energy penalty. So you may just end up trading LEED points elsewhere.

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