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Oil Nozzle wrong?

morke Member Posts: 6
I moved into a place with a Vitorond VR1-27 furnace with a Riello 40-F3 (part # C8511418) Burner. The setup sheet calls out a 0.60 x 0.60degrees x AS nozzle and I found thi exact nozzle in the bag with the paperwork. The factory installed nozzle is a 0.50 x 60 degrees x AS nozzle for a VR1-22 furnace and it's supposed to be swapped with the nozzle above for a VR1-27 furnace. I haven't taken anything apart but what if the installer did not swap the nozzle and used the 0.50 x 60 instead of the 0.60 x 60?

I plan to get a technician in to inspect everything but was just curious how much difference the wrong nozzle could be making.


    EBEBRATT-Ed Member Posts: 15,607
    edited January 2022
    Maybe the original installer decided to down fire it slightly. When your tech comes have him do a combustion test. He might decide to leave it as is.

    The smaller nozzle just means your firing a little less oil
  • Jon_blaney
    Jon_blaney Member Posts: 317
    I think those two models are the same except for firing rates. If it works, it works.
  • morke
    morke Member Posts: 6
    Tech left original nozzle because it was working before. Cleaned and adjusted everything. Draft pressures were good and no smoke so I guess it’s fine. Just makes me wonder why factory recommended nozzle was not used
  • Oilmon
    Oilmon Member Posts: 8
    Generally, a lower firing rate will result in lower flue gas temperatures which translate into higher efficiencies. If the input is matched to the load, there is no reason to fire at a higher rate. Ideally, you want your boiler to run continuously (steady state) on the coldest possible day (highest load) to heat the space to the highest desired temperature for the greatest system efficiency. Every time the boiler shuts off, you begine to lose heat through off-cycle loss.
  • STEVEusaPA
    STEVEusaPA Member Posts: 6,505
    Lower firing rate does not mean lower flue gas temperature. Flue temp varies more with draft and excess air than firing rate.

    There was an error rendering this rich post.

  • rsilvers
    rsilvers Member Posts: 182
    At this point you don't even know if they upped the pump pressure to keep the original firing rate.

    Probably he/she/ze changed the nozzle because it was all they had in the truck. As for it it matters, that depends on what your efficiency would be with the normal one vs that. It may not matter at all.