As I have searched web and try to understand the 90.1 clause G3.1.2.4, the system needs to use night cycle and keep outdoor air flow rate to zero. I therefore just have a simple question, if above understanding is right, how re-circulation (no outdoor air) alone to meet the cooling/heating loads from zones during unoccupied hours? Do coils work as well during night cycle? Thank you very much in advance for any reply.
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