OFTEC Oil Burner Types and Operation 2 — Questions and Answers
Question 1: What is the purpose of the oil burner nozzle's spray pattern?
- To create a specific cone of atomised oil for efficient mixing with air (Correct answer)
- To regulate the fuel flow rate only
- To filter impurities from the oil
- To reduce noise during ignition
Correct answer: To create a specific cone of atomised oil for efficient mixing with air
The nozzle spray pattern (hollow, solid, or semi-solid cone) determines how the atomised oil mixes with the combustion air. The correct pattern must match the combustion chamber design for clean, efficient burning.
Question 2: Which component in a pressure jet burner creates the spark to ignite the oil?
- Ignition electrodes connected to a transformer (Correct answer)
- The photocell
- A piezoelectric igniter
- A pilot light
Correct answer: Ignition electrodes connected to a transformer
Ignition electrodes, powered by a high-voltage transformer (typically 10,000V), create a spark across a gap to ignite the atomised oil spray. The electrode gap and position are critical for reliable ignition.
Question 3: What is the function of the blast tube in a pressure jet oil burner?
- To direct and shape the airflow into the combustion chamber (Correct answer)
- To exhaust combustion gases
- To house the fuel pump
- To insulate the burner from the boiler
Correct answer: To direct and shape the airflow into the combustion chamber
The blast tube channels combustion air from the fan into the combustion chamber in a controlled pattern. It also houses the nozzle assembly and electrodes, directing the fuel-air mixture for optimal combustion.
Question 4: How often should a domestic oil burner be serviced according to OFTEC guidelines?
- Annually (Correct answer)
- Every six months
- Every two years
- Every five years
Correct answer: Annually
OFTEC recommends annual servicing for all domestic oil-fired appliances. Regular servicing ensures safe operation, maintains efficiency, and can identify potential problems before they become dangerous.
Question 5: What happens if the nozzle in a pressure jet burner becomes partially blocked?
- Poor atomisation leading to incomplete combustion and sooting (Correct answer)
- The burner operates more efficiently
- Fuel consumption decreases
- The flue gas temperature drops significantly
Correct answer: Poor atomisation leading to incomplete combustion and sooting
A partially blocked nozzle disrupts the spray pattern, causing poor atomisation. This leads to incomplete combustion, excessive soot production, reduced efficiency, and potentially dangerous carbon monoxide production.
Question 6: Which type of oil burner is most commonly installed in UK domestic properties?
- Pressure jet burner (Correct answer)
- Vaporising burner
- Dual-fuel burner
- Rotary cup burner
Correct answer: Pressure jet burner
Pressure jet burners dominate the UK domestic market due to their reliability, efficiency, and ability to handle varying heat demands. Vaporising burners are now rarely installed in new systems.
OFTEC Oil Burner Types and Operation 2
What is the purpose of the oil burner nozzle's spray pattern?