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NC-v4 EAp2:Minimum energy performance

Economizer for climate zones 2a, 3a, and 4a

I have a question regarding the economizer in climate zones 2a, 3a, and 4a. Per ASHRAE 90.1-2013 Table G3.1.2.7, no economizer is required for the baseline model for HVAC systems in the climate zones mentioned above. However, per Table G3.1.2.8, the economizer high-Limit shut offs for climate zones 2a, 3a and 4a are 28 Btu/lb.  
If no economizer is needed for climate zones 2a, 3a, and 4a, why has the economizer high-Limit shut off been required for the economizer in these climate zones?

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Tue, 08/03/2021 - 17:07

This appears to be an error in 90.1-2013. Economizers are not required for these climate zones. Note that 90.1-2010 is the referenced standard for LEED v4, but 90.1-2013 may be used by applying LEED Interpretation 10481.

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