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Flu gas condensate

tonelow54
tonelow54 Member Posts: 4
Recently installed 5 in chimney liner that's venting 60,000 btu furnace and 40,000 hot water tank
Condensation is forming inside of liner and dripping into furnace should I insulate flu liner ?

Comments

  • Paul S_3
    Paul S_3 Member Posts: 1,257
    edited May 2016
    Did you perform a combustion analysis? What type of furnace? Is the chimney on an outside wall?
    ASM Mechanical Company
    Located in Staten Island NY
    Servicing all 5 boroughs of NYC.
    347-692-4777
    [email protected]
    ASMHVACNYC.COM
    https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
    Mike
  • Steve Minnich
    Steve Minnich Member Posts: 2,755
    This question is not intended to insult you but we've all seen some strange installations to say the least so I have to ask. What is the AFUE rating of the furnace?
    Steve Minnich
    Minnich Hydronic Consulting & Design, LLC
    [email protected]
    GreenGenePaul S_3
  • tonelow54
    tonelow54 Member Posts: 4
    It's a brand new ducane 80 percent furnace , did not do a combustion analysis due to the age , and chimney is in center of house
  • Paul S_3
    Paul S_3 Member Posts: 1,257
    edited May 2016
    Combustion analysis shouldve been done at start up with gas pressure test.....any more info you can give us will help....is there a chimney cap?go back perform a combustion analysis stack temp could be too low....gas press out of adjustment etc
    ASM Mechanical Company
    Located in Staten Island NY
    Servicing all 5 boroughs of NYC.
    347-692-4777
    [email protected]
    ASMHVACNYC.COM
    https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
    tonelow54
  • tonelow54
    tonelow54 Member Posts: 4
    thanks for the advice will do combustion analysis , and yes there is a chimney cap will update after performed
  • MikeSpeed6030
    MikeSpeed6030 Member Posts: 69
    edited May 2016
    Condensation can be caused by replacing an older boiler or forced air furnace with one that is more efficient. Wringing additional heat out of the combustion process reduces the flue temperature. But, if your new unit is 80% efficiency, that doesn't seem to be the likely cause. Can you link us to the manufacturer's specs for your model?

    It's possible that the excess air is off - but a combustion analysis would tell.