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    Delion's Avatar
    Delion Posts: 1, Reputation: 1
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    #1

    Jan 28, 2010, 08:55 PM
    No heat from a Coleman Direct vent forced air furnace Model #7680a
    I am having promblems with getting the heat from an older Coleman Direct vent forced air furnace Model #7680a that's installed in a mobile home. The thermostat was replaced The fan comes on. The pilot feed that goes into the side but isn't attached. Do u have any specs on this model?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jan 28, 2010, 08:59 PM
    No but I know a site that specializes in Mobile home furnaces especially Coleman. Go to the link below sign in and post your question under Coleman.

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    Geokohler's Avatar
    Geokohler Posts: 5, Reputation: 1
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    #3

    Jan 28, 2010, 09:16 PM

    First reattach the feedline to the pilot light. You need to hold down the control until it lights and continue to hold it for a while to allow the thermocouple to heat up and allow gas to flow. You may need a long wire with a match twisted to the end to light it. They didn't place it in the best location.

    Next Check your upper and lower limit switches these are the proper settings:
    Upper = 7680-3791= Open @ 140*/Close @ 120*

    Lower = 7660-3591 = Open @ 150*/Close @ 130*

    Fan- Limit = 7700-3281 = Open @ 120*/Close @ 90*

    Next check the burner & automatic relight burner assembly, make sure they are clean and functioning as designed.

    If it still does not work feel free to contact me. George
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