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

Why are isolation (service) valves installed at a hydronic boiler and circulator?

To replace the ASME pressure-relief valve. To keep the expansion tank from ever seeing system pressure. To block the relief-valve discharge as required by UMC 1005.0. To allow the boiler, pump, or a zone to be serviced without draining the entire system.

Correct Answer:

To allow the boiler, pump, or a zone to be serviced without draining the entire system.

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