Results 1 to 10 of 10

Thread: AH coils

Hybrid View

  1. #1
    Join Date
    May 2011
    Posts
    7

    AH coils

    I opened the service panels on two Lennox Air Handlers and the coils were black in color and had several had a soot like residue on them. The air handlers were located in a designated hall closet, one 4 ton and one 2 ton. I work in central Florida and suspect it may be from chinese drywall. Could there be another cause?

  2. #2
    Join Date
    May 2004
    Location
    Frederick, MD
    Posts
    879

    Heavy

    smokers or candles?

  3. #3
    Join Date
    May 2011
    Posts
    7

    A.H Coils

    Thank you for the reply gregp.

  4. #4
    Join Date
    Feb 2002
    Posts
    516
    If the residue is only on the copper, then I would say that it was a chemical reaction with sulfur/sulfides in the air. This material is somewhat shiny in appearance and will flake off the copper tubing. If the material is all over the fin-pack then it is probably air borne particles--soot or dirt.

  5. #5
    Join Date
    May 2011
    Posts
    7

    AH Coils

    Both units were installed in 2006. The home is occupied by the original owner. The discoloration was only on the coils. There was heavy dust accumulation on the fins, but no evidence of smokers or candle smells.

    Thank you Bill Lee.

  6. #6
    Join Date
    Aug 2001
    Location
    forney texas
    Posts
    17,827
    were they painted to help with keeping the salty air from corrodeing them?

  7. #7
    Join Date
    May 2011
    Posts
    7

    AC Coils

    They did not appear to be painted. The home is located in Kissimmee, FL.

    Thank you manko

  8. #8
    Join Date
    Oct 2009
    Location
    St Pete, FL
    Posts
    76
    I've read a little about that Chinese drywall and talked to a friend of mine who helped demo some out of a commercial building. It's nasty stuff!! I wouldn't, personally, work around it if I knew what it was.

    You can look here: http://en.wikipedia.org/wiki/2009_Ch...ivity_concerns

    and you will find there, this text at the top:
    The 2009 Chinese drywall controversy is a health and safety issue involving defective drywall manufactured in China and imported by the United States starting in 2001. Laboratory tests of samples for volatile chemicals have identified emissions of the sulfurous gases carbon disulfide, carbonyl sulfide, and hydrogen sulfide. These emissions, which have the odor of rotten eggs, worsen as temperature and humidity rise and cause copper surfaces to turn black and powdery, a chemical process indicative of reaction with hydrogen sulfide. Copper pipes, wiring, and air conditioner coils are affected, as well as silver jewelry. Homeowners have reported a variety of symptoms, including respiratory problems such as asthma attacks, chronic coughing and difficulty breathing, as well as chronic headaches and sinus issues.[1][2][3]
    I'd say you ought to let the homeowner know about your suspicions and recommend that they contact their insurance company and/or a reputable testing company. Tell them to beware of scams.

    Keith

  9. #9
    Join Date
    Sep 2009
    Posts
    82
    Is just might me mold...

  10. #10
    Join Date
    May 2011
    Posts
    7

    AC Coils

    Thank you Bladeforger and smooth_operator for your responses.

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