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10" Flue Pipe- Open Tee- Coal to Gas Boiler

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CSACH
CSACH Member Posts: 5
edited May 8 in Chimneys & Flues
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So who would reposition the tee and add a DA draft regulator and who would scrap the whole thing even though the COAF is under 60 ppm, stack temp 400 after 15 minutes cold start up with a draft of -0.004-7, and the spillage at just inside the tee bottom is almost the same as through the breech?

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  • mattmia2
    mattmia2 Member Posts: 17,061

    what kind of burner is on the boiler? how is it controlling secondary air and draft?

  • Big Ed_4
    Big Ed_4 Member Posts: 3,542

    Atmospheric burner its ok , a power burner its incorrect ….

    There was an error rendering this rich post.

    mattmia2
  • Bob Harper
    Bob Harper Member Posts: 1,169

    The chimney should be relined with ss sized to the application with the liner brought into the CAZ. That eliminates the need for a cleanout. Yours is way too low to meet code. The connector cannot be cemented into the masonry. Re-pipe it with a bullhead tee, x2 baro damper w/ spill switch wired to the burner. To get the proper gauge pipe, just use 24 ga. ss for a permanent vent connector unless you want to get 22 ga. black stovepipe.

    Your combustion analysis numbers were incomplete. Mainly, what was the O2? That is no draft- you need a minimum of -0.02wci for proper burning but not over -0.04. The baro would take care of that. Where did you take your draft reading- btw the boiler and the horizontal draft hood or btw the opening and the chimney? Big difference.

    Take the NCI course.

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