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Burner Motor

BDR529
BDR529 Member Posts: 306
in Oil Heating
Original motor is 3400 RPM. Replacement motor is 3330 rpm. Contacted manufacturer and get "specs change" for an answer. How can this not effect pump performance?

Comments

  • STEVEusaPA
    STEVEusaPA Member Posts: 6,505
    edited November 2023
    Can I see a pic of that? Who's motor? Never heard of a 3330. But maybe I just never looked.
    Anytime you replace a motor you should do a combustion test anyway, and in this case, I'd probably confirm and/or adjust pump pressure if needed.

    There was an error rendering this rich post.

  • BDR529
    BDR529 Member Posts: 306
    Buderus LoNox Blue flame.
  • HVACNUT
    HVACNUT Member Posts: 6,239
    I wouldn't change anything as far as spec for the BE burner. Bosch Buderus can't help you? 

    Great burners. Obviously didn't last in the U.S. but OEM parts should still be available. 
  • BDR529
    BDR529 Member Posts: 306
    That is the same print out I have for parts.
    Yes, I agree don't change anything. Even the air is preheated nevermind the oil.
    Talked, emailed etc.. Buderus says specs just change

    This burner is very staunch. To drop 70rpm's and say specs change, got to do better than that.
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 9,157
    Pump pressure will not be affected. Once the pump starts turning at enough RPM to open the pressure adjusting valve, the spring tension will set the pressure, so 3000 RPM pressure will be no different than 3300 or 3450 RPM. The air delivery static pressure will be different at different RPM motor rates. So you definitely need to check to see if the air adjustment needs to be adjusted.

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

    MaxMercyHVACNUTGrallert
  • HVACNUT
    HVACNUT Member Posts: 6,239
    If that's the OEM replacement, then fine. But the combustion test still need to be done. And you don't adjust the air on that burner. You use the chart in the manual and adjust the pump pressure to cross CO2 with the burner inlet air temperature. What will the pump pressure be? They don't care. But it'll be somewhere between 190 and 330 psi.
  • BDR529
    BDR529 Member Posts: 306
    Well, let's see what I get for gremlins.
  • Jamie Hall
    Jamie Hall Member Posts: 24,558
    Unless the specification also specifies a torque at a particular rpm, the rpm reading is almost meaningless. All induction motors (not synchronous, but they are rare in our work) have some slip, and the slip is a function of motor design and torque.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • ethicalpaul
    ethicalpaul Member Posts: 6,433
    Maybe they realized that 3400 was an incorrect (or overly optimistic) measurement

    NJ Steam Homeowner.
    Free NJ and remote steam advice: https://heatinghelp.com/find-a-contractor/detail/new-jersey-steam-help/
    See my sight glass boiler videos: https://bit.ly/3sZW1el

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