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The ___ of a modulating burner is the ratio of the maximum firing rate to the minimum firing rate.

A nonreturn valve is a type of globe valve that allows a boiler to be cut in on-line automatically when the boiler pressure is at or above the header pressure and allows the boiler to be taken off-line automatically if the pressure in the boiler drops below the header pressure.

The primary regulatory requirements related to electrical safety come from NFPA 70E®, Standard for Electrical Safety in the Workplace.

___ in boiler water causes corrosion and pitting of the boiler metal.

A ___ valve must stay open until there is a drop in pressure of about 2 psi to 4 psi below the opening pressure.

A face mask is a personal protective equipment device that provides respiratory protection from airborne contaminants.

Ammonia-water absorption chiller systems are commonly used for large applications where mechanical compression systems are not as efficient.

A ___ is a narrowed portion of a tube.

A ___ tank is a hot water system tank used to absorb changes in water pressure in a forced-circulation hot water heating system.

The types of mechanical draft are forced, induced, and a combination of forced and induced.