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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.

A blowdown valve should be kept open long enough for the water level in the gauge glass to drop out of sight.

A blowdown valve should be kept open long enough for the water level in the gauge glass to drop out of sight.

As the pressure increases in a boiler, the boiling and condensing point of the water decrease.

If plant conditions do not warrant a(n) ___, then a package feedwater system is commonly used.

A(n) ___ is not intended for hot water service.

If plant conditions do not warrant a(n) ___, then a package feedwater system is commonly used.

___ air controls the amount of fuel oil capable of being burned.