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.

A ___ hazard on the NFPA Hazard Signal System indicates the degree of susceptibility of a material to burning based on the form or condition of the material and its surrounding environment.

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

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

A ___ hazard on the NFPA Hazard Signal System indicates the degree of susceptibility of a material to burning based on the form or condition of the material and its surrounding environment.