The primary function of a pressure gauge is to de-energize a burner safety circuit and shut down the burner if the water level in the system drops below a safe operating level.

The only techniques used for leak testing are the standing pressure method and the standing vacuum method.

Refrigerants are selected for their ability to absorb, transport, and release heat at the proper temperature and pressure.

An evaporation test is performed by opening a low water fuel cutoff blowdown valve by hand.

Adjusting draft controls without proper training and equipment can cause poor air flow through a boiler.

A(n) ___ hazard area is a building or room that is used as a shop and related storage facility, light manufacturing plant, automobile showroom, or parking garage.

Adjusting draft controls without proper training and equipment can cause poor air flow through a boiler.

After blowing down the water column and gauge glass, the water should ___ the gauge glass.

The ___ uses a four-color diamond-shaped sign to display basic information about hazardous materials.

___ prevents blower operation at startup until the damper reaches purge position.