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  1. #1
    Join Date
    May 2007
    Location
    somewhere between heaven and hell
    Posts
    957

    combustion analyzer testing

    So I use a combustion analyzer to determine cracks in heat exchanger and other tests. The people I work with and talked to other service techs and no one in my area uses them. I am thinking your crazy for not using one. Oh well one up for me I guess.

  2. #2
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    4,235
    Good job. Now start using it to properly tune any appliance you touch.

    A good class to take is @ NCI by Jim Davis.

    www.nationalcomfortinstitute.com

  3. #3
    Join Date
    May 2012
    Location
    Upper Michigan
    Posts
    3,589
    I wish mine would get sent back already, I thought you died gravity, been gone awhile lol!

  4. #4
    Join Date
    Dec 2004
    Location
    Caledonia WI
    Posts
    881
    Does anyone regularly check their combustion analyzers with calibration gas? I just pegged my analyzer when I looked away to answer customer on blower motor change. Found bad regulator in gas valve causing over firing. Just ordered calibration gas and will now check it often.

  5. #5
    Join Date
    Mar 2010
    Location
    Rochester, NY
    Posts
    437
    I was doing 2 c&c on 2 furnaces a couple of weeks ago, both goodman furnaces. I found cracked hx on both furnaces (visual) so I fired up my 327 to see how they were operating. Furnace #1 had rising CO so I shut it down and disabled it. Furnace #2 had stable CO under 60ppm so I left it in operation and advised the customer that both HX needed to be replaced. I would not have know the difference without my CA as they both looked the same as far as flame apperance.

  6. #6
    Join Date
    Jan 2007
    Location
    NH
    Posts
    250
    Didn't red tag it?

  7. #7
    Join Date
    Mar 2012
    Location
    New Hampshire
    Posts
    84
    Quote Originally Posted by perfectionist View Post
    I was doing 2 c&c on 2 furnaces a couple of weeks ago, both goodman furnaces. I found cracked hx on both furnaces (visual) so I fired up my 327 to see how they were operating. Furnace #1 had rising CO so I shut it down and disabled it. Furnace #2 had stable CO under 60ppm so I left it in operation and advised the customer that both HX needed to be replaced. I would not have know the difference without my CA as they both looked the same as far as flame apperance.
    Bad idea leaving a cracked HX in operation.


    "I don't know why it be like it is, but it do"

  8. #8
    Join Date
    Sep 2005
    Location
    Atlanta GA area
    Posts
    21,407
    Quote Originally Posted by perfectionist View Post
    I was doing 2 c&c on 2 furnaces a couple of weeks ago, both goodman furnaces. I found cracked hx on both furnaces (visual) so I fired up my 327 to see how they were operating. Furnace #1 had rising CO so I shut it down and disabled it. Furnace #2 had stable CO under 60ppm so I left it in operation and advised the customer that both HX needed to be replaced. I would not have know the difference without my CA as they both looked the same as far as flame apperance.
    Quote Originally Posted by zibby View Post
    Didn't red tag it?
    Quote Originally Posted by Tony3696 View Post
    Bad idea leaving a cracked HX in operation.
    Tricky call...

    Best is to tag ALL questionable appliances.

    Sometimes circumstances warrant different actions.

    Each of us has to make the decision.
    GA-HVAC-Tech

    Quality work at a fair price with excellent customer service!

    Romans Ch's 5-6-7-8

    2 Chronicles 7:14

  9. #9
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,324
    Quote Originally Posted by perfectionist View Post
    I was doing 2 c&c on 2 furnaces a couple of weeks ago, both goodman furnaces. I found cracked hx on both furnaces (visual) so I fired up my 327 to see how they were operating. Furnace #1 had rising CO so I shut it down and disabled it. Furnace #2 had stable CO under 60ppm so I left it in operation and advised the customer that both HX needed to be replaced. I would not have know the difference without my CA as they both looked the same as far as flame apperance.
    Next time, tag it. Note that you left it turned off on your invoice. But leave it in a condition that the customer can restart the furnace if they want.
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  10. #10
    Join Date
    Mar 2010
    Location
    Rochester, NY
    Posts
    437
    This is a special situation where my mother ownes an appartment building so if I tell them the furnace needs repair they will authorize the repair. I have two new HX on the truck but have not been able to do the work yet due to a back injury. Also if the second furnace was unstable or if it had high CO i would have disabled it also. These are goodman 80% not that it matters much a cracked hx is a cracked hx.

  11. #11
    Join Date
    Sep 2005
    Location
    Atlanta GA area
    Posts
    21,407
    I would be VERY careful with bending safety requirements on bad HXE's... one could cause something they do not want on their conscious for the rest of their lives... like a CO poisoning issue.

    Having said that: A combustion analyzer will tell a lot more than a visual inspection. This one is a tuff call.

    Personally, I think I would have provided a few elec space heaters and tagged it.
    GA-HVAC-Tech

    Quality work at a fair price with excellent customer service!

    Romans Ch's 5-6-7-8

    2 Chronicles 7:14

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