OFTEC Oil Burner Types and Operation 5

Question 1

What is the function of the oil filter installed on the supply line before the burner?

Accepted Answer

To remove water and particulate contaminants that could block the nozzle

Answer

The oil line filter removes water, sludge, and particulate matter from the fuel before it reaches the burner pump and nozzle. A blocked filter will starve the burner of fuel, causing lockouts or poor performance.

Question 2

What is the purpose of a post-purge on an oil burner?

Accepted Answer

To clear combustion gases from the heat exchanger and flue after the burner stops

Answer

Post-purge keeps the fan running after the burner flame goes out, pushing remaining combustion gases through the heat exchanger and up the flue. This extracts residual heat and prevents condensation in the combustion chamber.

Question 3

What type of ignition system do modern oil burners typically use?

Accepted Answer

Electronic interrupted ignition

Answer

Modern oil burners use electronic interrupted ignition where the spark operates only during the ignition period. Once flame is established and confirmed by the photocell, the spark stops. This extends electrode life compared to continuous ignition.

Question 4

What is the danger of running an oil burner with a cracked combustion chamber?

Accepted Answer

Combustion gases including carbon monoxide can escape into the living space

Answer

A cracked combustion chamber allows toxic combustion gases, including carbon monoxide (CO), to leak out of the sealed combustion area into the room. This is a serious safety hazard that requires immediate attention.

Question 5

In a wallflame burner, how does the flame pattern differ from a pressure jet burner?

Accepted Answer

The flame spreads across the combustion chamber walls rather than projecting forward

Answer

Wallflame burners direct the flame across the walls of the combustion chamber, providing a wider, more even heat distribution. This differs from pressure jet burners which project the flame forward in a cone shape.

OFTEC Practice Test

OFTEC Practice Test

OFTEC Oil Burner Types and Operation 5