NV C-1A Boilers Practice Questions - Nevada C-1A Boilers Contractor Examination Exam

When is a zone circulator a better choice than a zone valve on the same boiler?

When the designer wants one small pump to push every zone through a high-head coil at once. When the relief valve must be zoned off during service. When NFPA 54 requires a pump on every gas train. When each zone needs its own flow and head, or when a failed closed zone valve would block the only pump.

Correct Answer:

When each zone needs its own flow and head, or when a failed closed zone valve would block the only pump.

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