NM CID MM-1 Practice Questions - New Mexico CID MM-1 Plumbing Examination Exam

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Hot-water circulating piping installed under UPC 2021 shall return unused circulated water to the water heater. A check valve in that return is installed to:

Serve as the required temperature-and-pressure relief valve Increase circulating-pump head Prevent reverse thermosiphon or backflow through the return into the cold-water or fixture piping Replace the expansion tank on a closed system

Correct Answer:

Prevent reverse thermosiphon or backflow through the return into the cold-water or fixture piping

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