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___ systems are commonly used to cool large buildings such as hotels and stadiums.

Even though it is considered a low water condition to have water below the NOWL, it does not become dangerous until the water in the gauge glass drops out of sight.

___ systems are commonly used to cool large buildings such as hotels and stadiums.

A faulty safety valve could cause a boiler explosion.

The water in a boiler is heated, turns to steam, and leaves the boiler through the ___.

If a flame scanner does not prove a pilot flame during the pilot flame-establishing period, the pilot ___ will be de-energized, preventing fuel flow to the burner.

A faulty safety valve could cause a boiler explosion.

The ___ of fuel oil is the temperature at which fuel oil gives off vapor that flashes when exposed to an open flame.

During a boiler inspection, the main steam stop valve is ___.

Steam allowed to enter the Bourdon tube of a pressure gauge can result in a false reading and/or cause damage from warping.