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An evaporation test is performed by blowing down the low water fuel cutoff.

To prevent damage to a brick refractory, the furnace ___.

To prevent damage to a brick refractory, the furnace ___.

___ pressure is the pressure caused by the weight of air surrounding the earth.

A ___ pump produces a negative pressure on condensate return lines to draw condensate back from a system.

Small particles of water carried into steam lines are called ___.

A(n) ___ is a metering device that senses the temperature of the refrigerant discharged from an evaporator and controls the amount of liquid refrigerant flowing into the evaporator.

The relief valve should be located on the highest part of the boiler.

A(n) ___ is a metering device that senses the temperature of the refrigerant discharged from an evaporator and controls the amount of liquid refrigerant flowing into the evaporator.

The four systems necessary to operate a boiler are feedwater, fuel, draft, and ___.