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The determining factor whether a boiler is in condensing mode or not is the return water temperature.

A siphon is connected between a boiler and a steam pressure gauge to prevent water from entering the Bourdon tube.

When burning No. 6 fuel oil, the fuel oil strainers should be cleaned at least once every ___ hr.

Chemical treatment changes calcium and magnesium into nonadhering sludge to prevent scale buildup.

An entry permit must be posted at confined space entrances or otherwise made available to entrants before entering a permit-required confined space.

An entry permit must be posted at confined space entrances or otherwise made available to entrants before entering a permit-required confined space.

High-efficiency condensing boilers may use steel or ___ stacks because of the low stack temperatures in these types of boilers.

High-efficiency condensing boilers may use steel or ___ stacks because of the low stack temperatures in these types of boilers.

The liquid line is a refrigerant line that carries the warm, high-pressure liquid refrigerant between a condenser and a metering device.

The liquid line is a refrigerant line that carries the warm, high-pressure liquid refrigerant between a condenser and a metering device.