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  1. #1

    Confused Burnham ES2 boiler CO issue cont'd

    A few weeks ago our CO alarm in the basement near the boiler went off and eventually registered 276 (Fire Dept showed 277). We live just outside Anchorage and put the new boiler in as part of a state sponsored upgrade program about three and half years ago. Searching for answers to the problem led me to your site and a post by Mark325i on 12/7/2012. We had almost identical issues except we do have an outside air source in the boiler room. After discussion with the manufacturer and techs from the location we purchased the boiler from we discovered a door modification kit through a U.S. Boiler Co. product safety bulletin dated 12/2/2011. The techs do not feel that this will make a significant difference and feel the issue is that the high efficiency boilers do not burn as hot or as often as the older models setting up the potential for the flue to not draft with specific atmospheric conditions in and outside the house. We have an electronic dampener that has to open before the furnace fires and it is working as advertised. I am curious if there is an additional exhaust fan that could be installed up the flue pipe and/or possibly a CO cutoff gauge that would shut the furnace down if an event was to happen again. The current flue pipe does not meet the new code regarding how far it extends above the roof line but the tech who came out to specifically look at it said extending it would not necessarily help our internal CO issue and could possibly hurt by having a longer pipe exposed to more cold air.

  2. #2
    We have experienced another CO issue. This time the readings in the basement reached over 400. We are scheduled for the door modification and rerouting and lengthening of the flue pipe on Tuesday. We just had another shot of cold weather. Has anybody experienced anything similar and can lend advice.

  3. #3
    Join Date
    Feb 2013
    Location
    OKLAHOMA
    Posts
    48
    This is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise, commentary, or ask questions of the OP here.

    You can find the rules for posting and qualifications here.

    Further infractions may result in loss of posting privileges.
    Last edited by beenthere; 05-19-2013 at 08:02 PM. Reason: Non Pro * Member

  4. #4
    Thanks for your reply dobbin. This is the second confirmed incident and my wife thinks we may have had one other. The flue is clean and clear and the boiler does not fire until the damper fully opens. We had the local companies combustion technician inspect the boiler and he found no issues with it. Our flue pipe is being modified this week to meet the new code. It currently does not extend above the highest roof line. The line of thinking with most people we have consulted is that because of the tightness of the home and efficiency of the boiler a potential back draft occurs (due to the pipe being cold from the boiler not running) when the flue opens prior to the boiler firing under certain atmospheric conditions. Our son had been running a bathroom fan that might have caused this interruption in the air flow last night.

  5. #5
    Join Date
    Nov 2011
    Location
    Long Island, NY
    Posts
    279
    Is the chimney metal? If it is masonry, what size is the liner and how long is it?

  6. #6
    It is metal and is not routed through the chimney stack. Believe it is an 8 inch but could be just off with that.

  7. #7
    Join Date
    Nov 2011
    Location
    Long Island, NY
    Posts
    279
    Sounds like a two part problem. The appliance should not generate that percentage of CO, AND even though it is making those levels of CO it is supposed to vented to the outside and never contaminate the residence.

    Are we certain that it is the boiler making the CO?

  8. #8
    Join Date
    May 2012
    Location
    Upper Michigan
    Posts
    3,587
    How big is the room and is there any makeup air? Did they test draft? Sounds like you need a real tech to look over the situation.

  9. #9
    The boiler is the only gas appliance in the house and the only source near where the detectors initially alarmed. The room is about 60 sq ft with an outside air source and has a louvered door from the basement. I have be instructed to block that louver and plan to but was curious to see if the scenario could be recreated. The draft was tested when the boiler was serviced. When the FD turned the boiler back on last night it drafted fine. I have begun to question the design of the exhaust portion of the boiler itself and how it connects to the damper and flue.

  10. #10
    Join Date
    Feb 2010
    Location
    In a boiler room
    Posts
    6,915
    The plain truth is, a technician properly trained in combustion analysis and CO would be able to pinpoint the problem on the first visit. This training is optional and relatively few technicians take it.

    Go to www.stopcarbonmonoxide.com to find a qualified technician.

  11. #11
    Join Date
    Feb 2010
    Location
    In a boiler room
    Posts
    6,915
    Quote Originally Posted by R Mannino View Post
    Sounds like a two part problem. The appliance should not generate that percentage of CO, AND even though it is making those levels of CO it is supposed to vented to the outside and never contaminate the residence.

    Are we certain that it is the boiler making the CO?
    The problem is, a boiler can go from 10 ppm of CO to 10,000 ppm in seconds if certain outside conditions change. If the flue gases start spilling, the CO produced can spike.

  12. #12
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    66,798
    Moved to AOP Residential forum. Where only vetted Pro members may reply to post.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  13. #13
    Join Date
    May 2012
    Location
    Upper Michigan
    Posts
    3,587
    I know one thing all of the govt paid for jobs around here have the all the hacks competing to see who can bid the lowest and do the crappiest work.

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