The three classifications of refrigerants most technicians work with today are chlorofluorocarbons (CFCs), hydrochloroflurorocarbons (HCFCs), and hydrofluorocarbons (HFCs).

The closed end of a Bourdon tube is attached to the steam side of a boiler.

High surface tension is a boiler water condition in which the surface of the water is strengthened by a layer of impurities.

A ___ test is a water treatment test using a reagent to determine the concentration of a specific dissolved substance.

In a high pressure gas system, the plant pressure ___ valve reduces gas pressure to line pressure used in the system.

The closed end of a Bourdon tube is attached to the steam side of a boiler.

A ___ test is a water treatment test using a reagent to determine the concentration of a specific dissolved substance.

High alkalinity can lead to ___.

A flame scanner is tested with a burner firing to simulate a flame failure.

U.S. Green Building Council® (USGBC) is an independent organization that tests equipment and products to verify conformance to national codes and standards.