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When a circulating pump is not operating, the flow control valve closes to prevent natural circulation.

When an increase in steam pressure is required, the ___ activates the programmer to start a purge cycle and lights the pilot light.

A boiler room contains many combustible materials, and boiler room fire safety requires established procedures to reduce or eliminate conditions that could cause a fire.

Fuel oil atomization temperature varies with the fuel oil grade and burner.

When an increase in steam pressure is required, the ___ activates the programmer to start a purge cycle and lights the pilot light.

Fuel oil atomization temperature varies with the fuel oil grade and burner.

Well-designed burners firing gaseous and liquid fuels operate at excess air levels of about ___% and result in negligible amounts of unburned fuel.

A(n) ___ is an air pressure-activated switch that closes after proving sufficient pressure of combustion air from the forced draft fan.

A(n) ___ is an air pressure-activated switch that closes after proving sufficient pressure of combustion air from the forced draft fan.

Balancing the water flow in a two-pipe reverse-return system is much easier than in other types of systems because the resistance to the water flow is the same for all heating units.