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A(n) ___ test is the most accurate method of testing a low water fuel cutoff.

Boiler ___ is a condition that occurs when a boiler is operating at or above its maximum allowable working pressure.

A(n) ___ sensor is a flame sensor that senses light frequencies that are higher than those visible to the eye.

A(n) ___ test is the most accurate method of testing a low water fuel cutoff.

Additional components that may be encountered with cooling systems are liquid receivers, accumulators, and purge units.

An internal furnace is a furnace in a boiler that is surrounded by a heating surface.

An ammonia-water chiller system commonly includes a generator, condenser, evaporator, and absorber.

An ammonia-water chiller system commonly includes a generator, condenser, evaporator, and absorber.

A pressure control must be mounted in a vertical position to ensure accurate operation.

A ___ is burner control equipment that monitors the burner start-up sequence and the main flame during normal operation.