Condensate in steam lines can result in ___.

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

A boiler should be filled with water heated to 70°F before it is started for the first time.

A boiler should be filled with water heated to 70°F before it is started for the first time.

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

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

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.

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.