17 Questions
What is the purpose of purging the combustion space of unburnt gas in a boiler system?
To prevent the formation of an explosive air/gas mixture
Which component in the electrical control scheme switches in the fan and oil circulating pump?
Thermostat on the electric heating elements
What is the primary purpose of the fuel heater in a boiler system?
To heat up and circulate the fuel
Why is it important for the oil to flow through the burner until it is hot and thin enough to atomize?
To ensure efficient atomization of fuel for combustion
What might happen if the air from the fan does not purge the combustion spaces for a sufficient time period?
Formation of an explosive air/fuel mixture
Which component ensures that when the oil circulating solenoid is operated, fuel is delivered to the low flame spill and not returned to the pump?
Oil change valve
What is the purpose of the float switch in a boiler system?
To activate an alarm in case of low water level
Why must gauge glasses in a boiler be regularly checked?
To prevent choking by solids and scum formation
What could happen if there is incorrect air quantity due to a fault with the damper in a boiler?
The burner will shut off
How can deviation from the correct temperature affect boiler operation?
The burner will be shut off
What is one method to check the operation of the flame failure photo-cell in a boiler system?
Starting the boiler with the circulating solenoid cut out
What action would result from a reduction in steam demand?
Closing the feed water control valve
What does the piston valve do when fuel is supplied at low pressure?
Closes off the passage to the atomizing nozzle
How many different pressures can the system supply the atomizer with fuel?
Three pressures
What is the purpose of the solenoid valves in this system?
Provide a return path for fuel to the suction side of the fuel pressure pump
What happens when either spill valve is in circuit?
Provides a return path for the fuel to the suction side of the fuel pressure pump
What is used to supply fuel to the burner in this system?
Gear pump with relief arrangement
Test your knowledge on how electrical control schemes are employed in combustion systems to heat up, circulate fuel, and purge the combustion space. Learn about the operation of combustion systems with constant speed fans and damper arrangements.
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