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

What does the high-limit aquastat on a hot-water boiler do?

It starts the oil-tank vent fan when water is cold. It interrupts the burner if water temperature exceeds the set high limit, independent of the operating control. It opens the relief valve at 30 psi. It proves chimney draft before every ignition trial.

Correct Answer:

It interrupts the burner if water temperature exceeds the set high limit, independent of the operating control.

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