Chilled water systems are classified as indirect cooling systems because chilled water is used as a medium to transfer heat and cool a building space.

There are four main causes of natural circulation in a boiler.

There are four main causes of natural circulation in a boiler.

An operating pressure control starts and shuts down a burner based on steam pressure.

Equipment in chemical feed systems varies but usually includes a mixing tank, a pump, control valves, piping, and a control mechanism.

A natural-circulation hot water heating system uses circulating pumps to transport water in the system.

A ___ is a rotary compressor that has rotating impellers to pressurize refrigerant.

A natural-circulation hot water heating system uses circulating pumps to transport water in the system.

Nonadhering sludge is best removed when a boiler is ___.

A(n) ___ is a heat exchanger that removes heat from a high-pressure refrigerant vapor.