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In this follow up video of the oil burner cleaning, I tackle the issue of the injector nozzle and how iimportant it is to be of quality materials.
The injector nozzle is made out of brass and has a small hole. The presurised fuel passes through the hole to atomize inside the chamber and burn. It is not uncommon fot the nozzle hole to widen up in a few days, due to poor manufacturing and materials. This leads to alteration of the air/fuel ratio inside the burner, and therefore, incomplete combustion and poor performance of the burner and the whole heating system.
This would actualy lead to raised fuel consumption and less performance due to energy losses.
That is why the nozzle quality is of utmost importance.
Regarding the retarders, they are used to "retard" the energy, to slow down the energy of the combustin and not let it go to the chimney that fast.
They help keep the heat (=energy) in contact with the tubes for longer. This way the energy will be able to transfer better to our working fluid (in our case, the heating water).
That's why the number of retarders matches the setting of the combustion.
If the combustion inside the chamber is set up to create a big amound of heat, then fewer retarders are needed. If the burn creates a smaller flame and generates smaller amount of heat, then more retarders are needed in order to keep that heat in contact with the tubes for longer.
Every manufacturer will have their own set up in their burner, so allways keep in mind that YOUR burner may be different.
As for the rear flue and chimney, if the burner is set up to work properly, and the nozzle is not worn out, and the fuel pressure is correct and the air is properly set up, then there is very little soot (if none) that will accumulate in the flue and chimney. That's why you don't have to clean up that part all that often.
All that is important is the setup. The burner is setup from the factory to work properly, and it is important to keep that same setup in order to have our burner working properly for years.
Some parts are made to be "consumables", and these include the injector nozzles. Sometimes they are made so that they will be worn out during use, and they will need replacing. Others are of better quality and they may not need replacing for many years, and the burner will operate normaly during all those years.
Everything is designed differently.
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