Waste Oil Burner FAQ Sheet
1. Why is compressed air required?
Waste oil nozzles use air to help atomize heavier oils. They also have much larger oil passages, which reduces clogging. Air atomizing produces much finer droplets than conventional pressure atomizing. The oil passage in the nozzle is also much larger which reduces clogging.
2. Why is the fuel pump removed?
Waste oil burner nozzles are designed to siphon fuel from a lower level using air pressure. They atomize best like this and will provide the best efficiency and lowest emissions.
3. Can I pressure feed the nozzle?
Yes, but you may need a spring and ball in the nozzle as a check valve. More importantly, this is a very sensitive adjustment and not easily done under 1gph firing rate. 1/4psi can change your firing rate dramatically and the typical range for this pressure is 0-5psi. ckBurners highly suggests siphon feeding the nozzle.
4. Why do I need a longer blast tube?
This heater block needs to be housed in the blast tube and still have room to get a fuel line down in front of the burner housing.
5. What should I do for a float tank?
Any small 1-3gallon tank will work. You can use any cheap brass float valve but ckBurners suggests a 3/8” so the oil flows easier. Some have used an ammo container for the tank. The tank CANNOT be sealed, it must have at least a 1/8" hole to vent.
6. Why do I need at least a 12” deep combustion chamber?
Waste oil has a higher flashpoint, which makes it vaporize and burn slower making the flame longer.
7. Why do I need a new retention head?
Stock oil burner retention heads do not induce enough swirl into the air and fuel mixture for a good burn and flame shape. They also have too much recirculation that makes the oil land on the head and gum up the air passages.
8. What burner will work.
Any burner with a 4” O.D. blast tube will work. Beckett AFG and AF burners are the easiest to find and convert.
9. What if I need more than 225,000 BTU's?
You can pressure feed nozzles with 0-10psi to achieve very large firing rates. However, you may have nozzle drip issues.
10. Where can i purchase replacement nozzles or different sizes?
We sell a full selection here at ckburners and they are ALWAYS in stock.
11. What air compressor should i use?
Any compressor capable of 2-3cfm at 4-15psi will work. This includes some air brush compressors, as well as a lot of cheap Harbor Freight models.