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  1. #1
    Join Date
    Apr 2008
    Location
    Greenwood Lake, ny
    Posts
    50

    Hmm chimney staining

    today i went to do an atu on a ect 05 boiler . checked nozzle size was small
    put in correct size . customer said that he had staining coming down his
    white chimney onto his slate roof . was it because nozzle size was to small.
    i never incounted this before.can someone alberate.

  2. #2
    Join Date
    Jun 2003
    Location
    New Hampshire
    Posts
    2,666
    What kind of liner?
    Exterior or interior chimney?
    How cold is it outside?
    Could be excess condensation or a problem like we encountered.
    We had a customer who had a Buderus with a oil fired Carlin elite burner.
    Not much exposed chimney. 6 inch all fuel chimney into an expensive white decorative enclosure.
    Left an orange stain all over side of it above the roof line.
    Maximum size nozzle and even took out baffles.
    The stain was removed and it came back again.
    We changed to a Riello burner and solved problem.
    I think it is just the way the fire burns on the carlin.
    Not sure if this helps or not.

  3. #3
    Join Date
    Apr 2008
    Location
    Greenwood Lake, ny
    Posts
    50
    it is stainless to top threw chimney. has a beckett burner on it. has a stainless cap also.i think because low nozzle size may be the cause.thanks writing me back.

  4. #4
    Join Date
    Jul 2007
    Location
    Mount Airy, MD
    Posts
    7,281
    Moved to "Tech to Tech"

  5. #5
    Join Date
    Jan 2012
    Location
    Broomall, PA
    Posts
    421
    After you changed the nozzle, what did the numbers look like. What was the net stack temp at the breech? What was overfire and breech draft? Yes. Underfiring a boiler could easily cause low stack temps & condensing.

  6. #6
    Join Date
    Aug 2004
    Location
    S.E. Pa
    Posts
    6,237

    Cool

    KW10925, first of all, it would be appreciated if you used normal capitalization and punctuation. Also, it would be wise to spell out names fully with the abbreviation in parenthesis first.

    The staining could be from condensation or it could be due to the design of the termination cap. Often, I install stainless steel caps with a reverse drip cone to prevent condensate from dripping down the sides of the chimney.

    How did you determine the nozzle was undersized? Did you perform before and after combustion analysis?

    I'm trying to understand you but do you mean the chimney has a full length chimney liner? The more details you provide the better we may be able to assist you.

    I presume you referred to an "Annual tune up" for a Peerless ECT 05 boiler. Thanks

  7. #7
    Join Date
    Apr 2008
    Location
    Greenwood Lake, ny
    Posts
    50
    Sorry about the capitalzations. I performed an ATU on the system.The nozzle
    size was incorrect,went to my spec book and found correct size.All the numbers were good in the 400s for stack . Dont remember all other specs off hand but the were in range.The chimney is a liner that is all the way to the top.I do not know what kind of a cap it has on it only what customer told me.Thanks for your help.

  8. #8
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    4,266
    theres a couple things you need to check.

    test smoke of flue gas
    perform combustion test and test draft
    check for worst case draft
    take temperature split of boiler

    do you have a senior tech you can goto for help?

  9. #9
    Join Date
    Mar 2012
    Location
    Maine
    Posts
    16
    It is not uncommon to find larger boilers downfired a little bit. I think the ECT is a Peerless right? I have seen many Peerless boilers run in the 300-400 net stack range with no signs of trouble.

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