The three designs of strainers used in hot water heating systems are basket, in-line, and wye.

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.

Run period is the period after ignition trials but before the operating set point is reached while the main burner is firing.

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

Run period is the period after ignition trials but before the operating set point is reached while the main burner is firing.

Hot water heating systems transfer heat by circulating heated water to and from a building space.

A boiler is an open metal container in which water is heated to produce steam or heated water.

When water and sulfur combine, they react to form ___, which corrodes boiler metal.