___ is the process of evacuating water and undesirable accumulated material from a boiler or fitting, such as a gauge glass.

A ___ is used in a boiler system if there are intermittent peak loads of condensate that can exceed the surge capacity of the deaerator, such as condensate with varying pressures or temperatures or condensate that does not have sufficient pressure to enter the deaerator on its own.

When replacing the flange cover in a duplex fuel oil strainer, the ___ must be carefully replaced to prevent air from entering the system.

A clean gauge glass is the only way to accurately determine boiler water level.

Main steam stop valves must be locked out and tagged during a boiler inspection.

Atmospheric pressure is the sum of gauge pressure and vacuum pressure.

The ___ line is a refrigerant line that carries low-pressure refrigerant between an evaporator and a compressor.

A steam system is a boiler system that supplies the proper amount of water to a boiler.

The ___ line is a refrigerant line that carries low-pressure refrigerant between an evaporator and a compressor.

A ___ is a burner accessory that opens when energized by contacts in the programmer to allow fuel oil to flow to a burner nozzle.