Page 2 of 3 FirstFirst 123 LastLast
Results 14 to 26 of 33
  1. #14
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,760
    Quote Originally Posted by Shophound View Post
    Wouldn't a combustion analyzer pick up a cracked heat exchanger; say when the blower starts up the numbers change notably?
    Most times, yes.
    Contractor locator map

    How-to-apply-for-Professional

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

  2. #15
    Join Date
    Jul 2008
    Location
    Rochester NY
    Posts
    4,702
    Quote Originally Posted by BaldLoonie View Post
    Of course the salestech who also thinks you should change a perfectly good A/C won't make his quota coming up with a HX swap. Nor will he likely make as much money doing the swap as selling an expensive system.
    Which makes more sense to you?
    CONSERVATION - turning your thermostat back and being uncomfortable. Maybe saving 5-10%
    ENERGY EFFICIENCY - leaving your thermostat where everyone is comfortable. Saving 30-70%

    DO THE NUMBERS! Step on a HOMESCALE.
    What is comfort? Well, it AIN'T just TEMPERATURE!

    Energy Obese? An audit is the next step - go to BPI.org, or RESNET, and find an auditor near you.

  3. #16
    Join Date
    Jun 2011
    Location
    Central Indiana
    Posts
    613
    The smoke test is a legitimate test. In fact it was once the test recommended by Trane. They also once made, and probably still do, "smoke bombs" designed for testing heat exchangers. More testing is necessary. Don't write off the first contractor just because the second contractor is not well trained.
    The only true knowledge is the pursuit of knowledge

  4. #17
    Join Date
    Jan 2002
    Location
    tip of the mitt
    Posts
    1,974
    This is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise here. Please apply to the AOPC today, thank you.

    You can find the rules for posting and qualifications here.

    Further infractions may result in loss of posting privileges.
    Last edited by beenthere; 10-31-2012 at 09:15 PM. Reason: Non Pro * Member

  5. #18
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,760
    randyt, this is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise here. Please apply to the AOPC today, thank you.

    You can find the rules for posting and qualifications here.

    Your post has been deleted.
    Further infractions may result in loss of posting privileges.
    Contractor locator map

    How-to-apply-for-Professional

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

  6. #19
    Does anyone have a video of a smoke test being performed? I've read about them - "Using a smoke puffer you can fill the burner chamber with smoke. Then turn the blower on. If the smoke sprays out and away from the burner opening you have a good indication of a leak in the heat exchanger."

    The tech did demonstrate this. However, the word "spray" is subject to interpretation. Yes, there was some movement of the smoke coming back from the burner, but how vigorous does that movement have to be to be a "spray". Without the burner on the smoke swirled around. Once it was turned on it swirled faster and came out.

    So far I haven't been able to find a video of how this looks like in a normal furnace and how it might look with a crack in the heat exchanger.

  7. #20
    Join Date
    Jul 2012
    Location
    Western KY
    Posts
    1,221
    Sounds like you have a compromised heat exchanger, indicated by 2 legitimate test procedures. If the email is accurate. Never used a smoke test but I have seen literature on it and it is legit. Using the magnehelic is also a legit test that I have used. If both were used and both indicate a split then you most likely have a split. A simple CO test would not be a good test with your furnace. Older natural draft furnaces could produce alot of CO when heat exchanger split and it could then be pushed into the conditioned space so a CO test was a common way to verify a split. Your furnace is induced draft and totally different operation.

  8. #21
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,760
    Smoke test may or may not have indicated a crack. If the air filter is external to the furnace and it is not sealed. The blower can pull the smoke out even though the HE is not cracked.
    Contractor locator map

    How-to-apply-for-Professional

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

  9. #22
    Tommy knocker...in clarification...the tech's boss said they perform a magnehelic, but the tech did not do that. The tech only puffed smoke into the entrance of the heat exchanger and we watched the smoke swirl back towards us. The tech then declared the heat exchanger cracked.

    Found out that in our small neighborhood (65 homes) this same contractor has told 4 families that they cracked heat exchangers in the last 2 months. We don't all have the same furnaces. Last year they did the same to 3 other families. This is a new development. Most homes are in the 8-10 yo range. Does this seem like a lot of homes for the size and age of the neighborhood? This was the contractor who did the installations for the builder so they ended up doing a lot of work for the homeowners with seasonal inspection contracts.

    I hear some of you say that checking CO is not a good test, so what is? Does anyone know if York has any tests or inspections they recommend?

  10. #23
    Join Date
    Apr 2012
    Location
    winnipeg
    Posts
    1,330
    get another opinion.... I smell something fishy......
    it was working.... played with it.... now its broke.... whats the going hourly rate for HVAC repair

  11. #24
    Join Date
    Jun 2009
    Location
    Upstate SC
    Posts
    1,439
    Visual inspection.

    Sent from my ERIS using Tapatalk 2

  12. #25
    Join Date
    Oct 2007
    Location
    Chicago, IL
    Posts
    56
    Second visual inspection, if you trust this company, good, agree to a new heat exchanger, new furnace contingent upon the fact that they can show you the crack once they remove the heat exchanger or replace the furnace. If not, they put it back, as it was, no harm, no foul, no charge.
    If they are confident in the smoke test, they should have no problems? right?

  13. #26
    Join Date
    Oct 2007
    Location
    Chicago, IL
    Posts
    56
    A cracked heat exchanger is easy to spot, when it is not inside of the furnace, inside of the furnace, it can be a b***h. If they are sure it is cracked, they would accept your challenge, otherwise, they would walk away, or am I wrong?

Page 2 of 3 FirstFirst 123 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