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Proper Nozzle Sizing

MRI Member Posts: 4


  • MRI
    MRI Member Posts: 4
    Proper Nozzle Sizing

    What is the best way to determine proper nozzle size for an existing boiler that has had many a hand in it? Is there a formula or procedure available based on boiler size and the existing baseboard heat load? If you could point me in the right direction I would appreciate it. The boiler in question at this time is W/M with Beckett AFG.
  • J.C.A._3
    J.C.A._3 Member Posts: 2,981

    Makes an OEM guide that most oil companies or suppliers should have. You might try their website, but I believe you need a password to get in.
    If you have the model # and # of sections of the boiler , try WeilMclean' site. Chris
  • clammy
    clammy Member Posts: 3,092
    nozzle sizing

    the boiler manifactor should have stamped on the boiler panel or in the instruction manual the max firing rate for the number of section on your boiler but there is more than just that you must check the fuel pump pressure to determine the correct size nozzle and adding all the radation load is a good start butr don't oversize your nozzle you will never get it to burn correct i usually down size my nozzle size to prevent short cycling and adjust the nozzle assemble and slightly bump up my fuel pressure then adjust the air , then make sure that the burner will light let the chamber cool down and make sure it re lights a few times nothing worse then to much air and i blows out the flame make sure you are are using the correct nozzle angle nozzle we have found 70 degreee noz work better thn 80 on the older becketts and on the large golds 60 work well the new becketts i 've recently installed came with a 45 and it burn quite sweet good luck with your burner
    R.A. Calmbacher L.L.C. HVAC
    NJ Master HVAC Lic.
    Mahwah, NJ
    Specializing in steam and hydronic heating
  • John@Reliable_5
    John@Reliable_5 Member Posts: 76
    What model W/M? Steam or FHW? Tankless?

  • MikeB34
    MikeB34 Member Posts: 155

    Call Beckett. The publish a "wholesalers & Installers guide to OEM oil specifications" They keep records on who uses what , and where. I use 1 frequently. U look up the manufacturer, and the model. It gives the nozzle. If you have the model # i may have the info for you.
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