A typical standard burner operating control package consists of only two separate pressure controls the operating control and the high limit control.

The boiler pressure should always be ___ the header pressure when cutting a boiler in on the line.

The boiler pressure should always be ___ the header pressure when cutting a boiler in on the line.

Natural gas is a colorless and odorless fossil fuel.

Plate-and-shell exchangers usually consist of a cylindrical shell containing a heating or cooling fluid.

Natural gas is a colorless and odorless fossil fuel.

A compression tank is normally full of water to feed into the boiler during a low water condition.

A backflow preventer with an intermediate atmospheric vent consists of four independent check valves within the body and an atmospheric vent between the check valves.

The condition of water column piping is determined by removing boiler cross tee plugs.

The main difference between how cooling systems operate compared to hot water heating systems is that cooling systems transport heat away from a building space to produce a cooling effect.