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

Condensate may be directed to a condensate return tank or wasted to prevent boiler water contamination.

Steam from a boiler is directed by the main steam line through the main steam stop valve and enters the steam header.

Steam from a boiler is directed by the main steam line through the main steam stop valve and enters the steam header.

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

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

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

High alkalinity can lead to ___.

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

Natural-circulation hot water heating systems are commonly used in large contemporary buildings.