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

When two or more heating boilers supply one hydronic header, each boiler should have which piping feature?

A common relief-valve discharge that is reduced and valved. A single shared low-water cutoff and no individual limits. A crossed oil-return that enters the other boiler’s tank vent. Isolation valves and a check or flow-control so one boiler can be serviced without forcing flow through the idle heat exchanger.

Correct Answer:

Isolation valves and a check or flow-control so one boiler can be serviced without forcing flow through the idle heat exchanger.

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