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Heat Exchanger Replacement

Roy Tenn
Roy Tenn Member Posts: 15
Hello Gentlemen,

Would like to know if anyone has any experience replacing the primary HX on Keeprite Hi-Eff furnaces.I have spoke to the Keeprite rep and they said the seams or rings on the HX
cracking is a common problem. The syptom for cracked HX is the roll out switch in the burner box trips intermittently.
Would like to know if this is a major job/hours? Difficulty? Any forseen problems removing, adjusting,etc.
I have checked all the prelimiary things like duct work,return air,air flow, temp. rise etc. all check out ok. The model number on these furnaces are:
1) M#NTGM075EGA S#L97211689
2) M#NUGM100EHA1 S#L943957872
Any information would be greatly appreciated.
Thanks in advance.



  • Steve Miller
    Steve Miller Member Posts: 115
    HX replacement

    Why replace it if it has a bad track record? Sounds like a serpentine style heat exchanger and most of the ringlets on that style go bad or fall out. Give a high labor bid for replacement because there is some libility involved and hassle of obtaining a replacement exchanger. Then give a price for replacing the unit with some proven equipement with a better warranty. I think the finest furnace made is Amana with their stainless steel heat exchanger. I went to a class in Denver put on by Ellis Pratch, he's the guru of heat exchanger cracks. His class was great and very hands on with over 100 furnaces all with cracked heat exchangers. Check out his web site at www.heatexchangerexperts.com
  • Roy Tenn
    Roy Tenn Member Posts: 15
    Thanks Steve

    for your input. Have you ever changed one of these HX or know of someone who did?
    Thanks also for the HX website. I will check it out.

  • Bryan_16
    Bryan_16 Member Posts: 262

    I have replaced a handful of these. First one is a learning experience. After that, pretty simple. #1 took about 3hrs. The rest take about 1.5. There should be a factory labor allowance and your customer should not have to pay anything for the repair.
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