maintenance on high efficiency furnaces

Discussion in 'HVAC' started by earl964, Dec 6, 2007.

Help Support House Repair Talk by donating using the link above.
  1. Dec 6, 2007 #1

    earl964

    earl964

    earl964

    United States Marine

    Joined:
    Dec 4, 2007
    Messages:
    4
    Likes Received:
    0
    Can some one tell me how much annual maintenance is involved in a 4 year old high efficiency furnace. It is a Goodman GMPN120-5 with a LP conversion kit. Filters are always changed and the condesate drain line is always gettig cleaned. I just dont know what else to look for.
     
  2. Dec 6, 2007 #2

    travelover

    travelover

    travelover

    Well-Known Member

    Joined:
    Aug 5, 2007
    Messages:
    693
    Likes Received:
    2
    Do you have the owner's manual?
     
  3. Dec 6, 2007 #3

    glennjanie

    glennjanie

    glennjanie

    Well-Known Member

    Joined:
    Mar 1, 2006
    Messages:
    2,990
    Likes Received:
    4
    Welcome Earl964:
    High efficency furnaces with LP gas conversion frequently accumulate soot in the heat exchangers, especially the secondary heat exchanger. I think there is a flexible snake for cleaning them; you might check with the dealer or distributor.
    They are also prone to burn holes in the primary heat exchanger. I know they are stainless steel but LP burns so much hotter than natrual gas and I have personally seen this problem. To find it, you can rub your hand lightly along the bottom tube feeling for holes or rough spots. If there is a rough spot an extension mirror and flashlight will give you a better look.
    Glenn
     
  4. Dec 7, 2007 #4

    earl964

    earl964

    earl964

    United States Marine

    Joined:
    Dec 4, 2007
    Messages:
    4
    Likes Received:
    0
    is the secondary heat exchanger behind the black colleter box. Is the primary wher you can see the flames inside the tubes.
    Thanks for the quick reponses
     
  5. Dec 7, 2007 #5

    glennjanie

    glennjanie

    glennjanie

    Well-Known Member

    Joined:
    Mar 1, 2006
    Messages:
    2,990
    Likes Received:
    4
    Hey Earl964:
    You've got it friend. the secondary heat exchanger is made of tubes closer to 1/2" diameter with aluminum fins on it to rapidly exchange the heat. After the exhaust gasses go through the secondary, you begin to get condensation in the flue which is now only warm to the touch. That's why they have to have a draft inducer, when the gasses are cooled that much it is hard to get it to draft.
    Glenn
    I was Army but I admire the Semper Fi.
     
  6. Dec 7, 2007 #6

    earl964

    earl964

    earl964

    United States Marine

    Joined:
    Dec 4, 2007
    Messages:
    4
    Likes Received:
    0
    Do I just take that cover off and find a brush that will fit inside those tubes and clean them out.
     

Share This Page