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A(n) ___ system is a solid-state control system in which a building automation controller is wired directly to control devices.

A gas law relates to events that occur as heat is generated by the combustion of a fuel and is used to produce steam or hot water in a boiler.

A gas law relates to events that occur as heat is generated by the combustion of a fuel and is used to produce steam or hot water in a boiler.

A(n) ___ is a heat exchanger used to absorb heat from an area to be cooled and transfer the heat into refrigerant.

An expansion tank moves water from a boiler to a supply line.

A(n) ___ is a heat exchanger used to absorb heat from an area to be cooled and transfer the heat into refrigerant.

Water hardness is commonly checked with an electronic hardness tester.

An aquastat commonly has a temperature differential preset by the manufacturer.

Common cooling system applications include air conditioning of building spaces and refrigeration in food processing, such as in a pasteurization process.

Steam headers and branch lines must be supported to prevent damage from strain.