The best time to blow down a boiler to remove sludge and sediment is when the boiler is under a ___.

In a feedwater system, the feedwater tank is a large condensate receiver used to collect condensate before it is directed back to the boiler or deaerator.

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

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.

A forced-circulation hot water heating system is vented to the atmosphere.

Nonadhering sludge is best removed when a boiler is ___.

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