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pre and post purge

Live/Learn Member Posts: 97
Hi! A question from a home owner diy . I recently installed a burnham v83 to replace an old weil that was 45 years old, My new boiler has a beckett burner with a pre and post purge feature. When ever the burner comes on it comes on with a "bang" sometimes more than at other times. I expect some noise as I realize that the pump is going from almost no pressure to 180psi all at once. My question is is this harmful to the boiler? I have noticed what appears to be small hairline cracks in the target wall when viewed from the inspection port. By the way a tech from Petro came by and set it up with instruments. Thanks learn /Live


  • John Starcher_4
    John Starcher_4 Member Posts: 794
    I believe......

    ....that an improper "Z-dimension" setting will cause a noisy startup on these burners. My experience has been that you need to physically check the Z setting, rather than rely on the little sticker that shows the proper position of the electrode assembly. I think you need to reference the actual Beckett manual for this burner, as the Burnham manual does not specify the Z setting for a burner with an L head on it. Last V83 I installed came with the Beckett manual along with the Burnham manual.

    Hope this helps.

  • J.C.A._3
    J.C.A._3 Member Posts: 2,981
    Does this beast.....

    Happen to have an outside air intake kit on it ? If it does, check Beckett for a nozzle line heater. Cold oil tends to light hard, and outside air will be flowing down that blast tube while the unit is off. This is definately NOT a diy project. It needs to be wired properly so it doesn't shut off during the off cycle! Chris
  • ed wallace
    ed wallace Member Posts: 1,613
    new burnham

    oil pressure is way to high needs to be changed you need a tech to do all the adjustments using a combustion test kit it cant be done by eye

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  • Live/Learn
    Live/Learn Member Posts: 97
    pre and post purge

    Hi again and thanks for your help so far. I'll give some more information to clearify my situation. I'm running a .75-45 degree solid nozzel @180psi as stated in my Burnham literature. I had it instrument tested by a Petro tech and the readings are as follows: draft: .02-.03; stack temp: 400 net; co2: 12. I do not have or require o/s air for combustion as the boiler area has adequate ventilation. I hope this helps, Thanks again.
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