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Oil Burner Running Rough

Marco12 Member Posts: 1
I have a WeilMclean boiler with a Carlin EZ-1HPW burner. The Nozzle is a .75 60B. The boiler sounded like a big truck running. I replaced the main oil filter, cleaned the flue, checked the chimney, Cleaned the boiler and cleaned the Nozzle (Nozzel had "soot" on it) and electrodes. No one near me had a new nozzle in stock so I had to order. The flame looks good.

I am thinking pump strainer next.


    EBEBRATT-Ed Member Posts: 15,532
    It needs a combustion test done and draft checked.
  • MaxMercy
    MaxMercy Member Posts: 508
    Check pump pressure for 15 minutes continuous, draft, CO2, and smoke readings. One of them will point you in the right direction.
  • Big Ed_4
    Big Ed_4 Member Posts: 2,785
    edited March 31
    You really can't take apart and clean a nozzle below 1.25 ...

    There was an error rendering this rich post.

  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 7,840
    edited March 31
    Big Ed_4 said:

    You really can't take apart and clean a nozzle below 1.25 ...

    My guess is, they cleaned the outside of the nozzle. But that can be problematic.

    The solvent, soap or cleaning agent used can cause debris to find its way to making a scratch on the finely machined orifice surface. Touching the cindered filter strainer with any dirt in or on it can force debris thru the filter and end up lodged in the tangential slots or orifice of the nozzle. Never clean a Nozzle smaller than 1.25 GPH, and avoid cleaning nozzles below 2.00 GPH. It just ain't worth it

    Once you get the proper nozzle, you will need to check the fuel pump pressure. after the fuel pump pressure is correct for the application you need to follow the instructions for adjusting the burner from this Instruction manual: https://carlincombustion.com/wp-content/uploads/MNEZ123-100923-r3b.pdf

    Pay particular attention to the important information on page 15 of the manual. In Particular the item that I put a Red check mark on

    If you are a DIY burner mechanic, you will need a Combustion analyser, smoke tester and draft gauge or manometer that can measure air pressure down to 0.01" water column (which is about 0.000 361 272 918 27 PSI). Really sensitive pressure/vacuum gauge.

    I spent over $1500.00 for my last combustion analysis kit, over 10 years ago. But if you are going to do this you need the proper tools. Without those tools you should not touch the FIRE that is basically burning in the middle of your home!
    Edward F Young. Retired HVAC ContractorSpecialized in Residential Oil Burner and Hydronics
  • Steamhead
    Steamhead Member Posts: 16,842
    @Marco12 , where are you located? We might know someone who can help. That boiler needs to be opened up and inspected, and cleaned if necessary, before tuning the burner. You might find something like this:


    This one was running a bit rough too, and you can see why.
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    EBEBRATT-Ed Member Posts: 15,532
    @EdTheHeaterMan , said

    . Never clean a Nozzle smaller than 1.25 GPH, and avoid cleaning nozzles below 2.00 GPH. It just ain't worth it

    In a perfect world I would agree. But if it's 2:00 am and you don't have another nozzle or the right nozzle you do what you gotta do to get the heat back on.

    I have cleaned many nozzles in a pinch and would always go back with a new nozzle especially on the small nozzles.

    I had a school once with old Power Flame burners that used a Steinen 90 SS nozzle they are no longer made. Substituting different MFG nozzles NG could not get a good combustion test although with the Steinen nozzles it was fine.

    Every year when I cleaned them I replaced the nozzle strainers, oil filters and pump strainers.

    Then I moved into the office and they had another "tech" take over the oil stuff. I specifically told him about the nozzles........he didn't listen and threw them out.

    2 months go by and were getting calls for smoke and soot. They suffered with it until they finally asked me if I could take a look. We tried different nozzles, different spray angles and pump pressures.

    They just wouldn't run without the 90 deg Steinen. Ended up changing the burners. Too bad because they could have got some more years out of them. But those were like 6:00 gph nozzles.

    My moto is never throw anything away until you know the replacement works.
    Marco12CLambDave CarpentierEdTheHeaterMan