Results 1 to 8 of 8
  1. #1
    Join Date
    May 2000
    Location
    Urbandale IA. USA
    Posts
    4,924

    Refresh my memory

    What factors affect moisture (sweating) inside the flue of an 80% furnace installed in a basement?
    .
    Those who dance, appear insane to those who do not hear the music.
    Those who believe, appear ignorant to those who do not know God.

  2. #2
    Join Date
    Oct 2009
    Location
    Rhode Island
    Posts
    116
    below 130degree flue gasses that wont happen at 80% tho check the flue gas

  3. #3
    Join Date
    Jan 2008
    Location
    s chester county,pa
    Posts
    144
    short run times = the answer

  4. #4
    Join Date
    Jun 2009
    Location
    Nevada
    Posts
    139
    Not enough heat. Did you downsize the furnace? I've seen moisture run down the flue and fry a circuit board.

  5. #5
    Join Date
    Sep 2009
    Posts
    82
    Flue gas temp, flue type, flue size, draft.

  6. #6
    Join Date
    Sep 2011
    Location
    Souther Cal
    Posts
    10
    Are you running the flue into a chimney or other concrete or brick flue?

  7. #7
    Join Date
    May 2000
    Location
    Urbandale IA. USA
    Posts
    4,924
    5" flue, double wall from basement through the middle of the house all the way to the roof (2 story).
    Furnace has a 4" going into the 5" along with a 3" from the gas water heater.
    I have NOT measured the flue temp.
    .
    Those who dance, appear insane to those who do not hear the music.
    Those who believe, appear ignorant to those who do not know God.

  8. #8
    Join Date
    Sep 2011
    Location
    Souther Cal
    Posts
    10
    I would measure the flue temp, the furnace is induced draft correct, since the main flue is 5" I am not sure if the standing pilot in the water heater will produce enought heat to keep it from condensating. In a cold climate area I had to insulate the doulble wall flue to stop this problem . Mainly in the basement.

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