Balanced draft is a mechanical draft from fans located before and after a boiler furnace.

A package boiler is a self-contained unit that is preassembled at a factory.

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 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.