Beckett AFG - Causing Faint Smell

Discussion in 'Boiler Forum' started by BobN, Aug 16, 2014.

  1. BobN

    BobN New Member

    Nov 29, 2013
    New Hampshire
    I had my heating system serviced one week ago (Beckett AFG on Weil McLain boiler in basement). The person who did the work was experienced (18 years) and seemed knowledgeable and quick. He found a bad oil pump seal, so replaced the pump. He cleaned the insides of the burner with brake cleaner, adjusted the electrodes, cleaned the photocell, replaced the filter and nozzle, brushed and vacuumed the flueways, and used a Testo 310 electronic all-in-one tester to measure performance. He smiled and said that this 30-year-old burner is working great, and left. The printout from the testing reads:
    Fuel Fueloil #2
    CO2MAX 15.7%
    8.9% O2
    7ppm CO
    606.2F Fluegas Temp
    77.8% EFF
    8ppm Ambient CO
    76.4F Ambient Temp
    -0.0005 Draugfht
    68.9% Excess Air
    --.-psi Diff Press
    9.03% CO2
    12ppm Undiluted CO

    And the system starts and runs fine. Before service, the burner dripped oil. Replacing the oil pump solved that. Cleaning everything with brake cleaner seems to have removed all of that residue, and airing out the basement for a week removed any hint of brake cleaner.

    My only concern is now I detect a faint oil smell at the top of the basement stairs, as if there is some exhaust coming from the system into the basement with a lighter-than-air component. When I air out the basement and stairs, the smell goes away, but if I close the basement door for a day, the smell comes back. It's a faint smell, almost unnoticeable, but definitely a smell.

    Should I be concerned? Is there anything in the test results that point to any sort of concern? What would you suggest for next steps?

    Thank you.

  2. DonL

    DonL Jack of all trades Master of one

    Mar 30, 2011
    Rocket Scientist
    Houston, TX
    I have never known a oil system that did not have a smell. If you are not leaking anymore, you should be OK.

    You may have some fuel that needs to evaporate or burn off. Don't guess you have been using it much, this month to burn the oil off.

    It is best to have a Carbon Monoxide Alarm around your unit, and it will most likely tell you if you have a real problem when you use it.

    You are most likely ok, but a Alarm is a must, I think.
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  4. Tom Sawyer

    Tom Sawyer In the Trades

    Nov 29, 2010
    The burner is running too clean. Co2 shouldn't exceed 13% and on an older Weil McLain I don't let them run much past 11%. The excess air reeding is high also for the same reason. IOW the air inlet is open to wide. Have him come back and readjust it. Do not try and do it yourself without proper instruments. Properly adjusted there should never be any odor.
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