Page 3 of 9 FirstFirst 123456789 LastLast
Results 27 to 39 of 113
  1. #27
    Join Date
    Dec 2002
    Location
    in a house, Appomattox, Va.
    Posts
    3,431
    on the co testing in flue gases, remeber that O2 levels varys with the combustion air temp.

    If I set up an oil furnace at 12% CO2 at 20 degrees, at 70 degrees the CO2 would move up to 13.5 or so. Co would also go from little to likely several hundred ppm.
    Col 3:23


    questions asked, answers received, ignorance abated

  2. #28
    Join Date
    Oct 2011
    Location
    Bonneau SC
    Posts
    2
    On package units or splits that have a plenum you can see the hx in if you get a good bright led flashlight put it in the tubing and look down the plenum or n the package unit sometimes that helps me find those hard to find cracks!!!!!!

  3. #29
    Join Date
    Jan 2011
    Location
    Boston, MA
    Posts
    461
    Quote Originally Posted by tinknocker service tech View Post
    rusted hx needs a good cleaning and vacuming out then check to see if a crack is there
    have seen many a rusted hx lennox and carrier mostly but could not find ant cracks just poor draft in most cases
    How do you clean and vacuum a heat exchanger? Esp. those with tight enclosed burner boxes?

    Also anyone have any tips on checking secondary HX's?

  4. #30
    Join Date
    Mar 2011
    Location
    Edna Bay, Alaska Highest concentration of black bears in the US
    Posts
    623
    Quote Originally Posted by DarrinB View Post
    I just looked at a 16 y/o ICP (looks like a Heil maybe) condensing furnace that I know has a problem on the center one of it's 3 burners. I can see the flame change with the blower, but I can't find a crack or a hole in any of the places I can get my borescope into. Any ideas on where these fail. I am just not familiar with them.
    The round hole where they are connected. The ring pops off, just like the Goodmans. They had a service bulletin on them, and a recall at one time.

  5. #31
    Join Date
    Jul 2010
    Location
    nebraska
    Posts
    1,629
    Quote Originally Posted by FrostyBeer View Post

    Also anyone have any tips on checking secondary HX's?
    I check secondary hx's by pulling the blower and getting in there. White lime scale looking deposits are a dead give away of a leaker.

  6. #32
    Join Date
    Jul 2009
    Location
    st louis mo
    Posts
    334
    what is this red tagging crap?

  7. #33
    Join Date
    Jan 2011
    Location
    Boston, MA
    Posts
    461
    Quote Originally Posted by martyinlincoln View Post
    I check secondary hx's by pulling the blower and getting in there. White lime scale looking deposits are a dead give away of a leaker.
    What about checking if they're plugged up or blocked?

  8. #34
    Join Date
    Jan 2011
    Location
    Boston, MA
    Posts
    461
    Quote Originally Posted by mike dixon View Post
    what is this red tagging crap?
    Disabling a piece of equipment do to unsafe conditions (ex. cracked HX) and slapping a red tag on it saying unsafe, do not operate and whats wrong with it or what have you.

  9. #35
    Join Date
    Jul 2009
    Location
    st louis mo
    Posts
    334
    We cant red tag stuff here, wish we could

  10. #36
    Join Date
    Aug 2011
    Location
    Eastern Shore, MD
    Posts
    799
    Quote Originally Posted by mike dixon View Post
    We cant red tag stuff here, wish we could
    psh.

  11. #37
    Join Date
    Jul 2010
    Location
    nebraska
    Posts
    1,629
    Quote Originally Posted by FrostyBeer View Post
    What about checking if they're plugged up or blocked?
    Only ever saw one plugged up and the CO in the flue was over 1000ppm.

  12. #38
    Join Date
    Oct 2011
    Location
    Hendersonville, Tennessee
    Posts
    30
    Use a combustion analyzer tool, no matter if it is a newer furnace or not, a cracked Heat Exchanger is never good.

  13. #39
    Join Date
    May 2011
    Location
    Ripley, WV
    Posts
    1,336
    I've found several that were sooted really bad and they were cracked too. I always wonder when I see them like that did the crack mess up the combution and cause the soot or did they soot up and overheat leading to the crack? Kinda reminds me of the chicken or the egg saying.

Page 3 of 9 FirstFirst 123456789 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event