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-   -   Coleman furnace model number 7970c85 (https://www.askmehelpdesk.com/showthread.php?t=603287)

  • Oct 12, 2011, 03:29 PM
    poncho1112
    Coleman furnace model number 7970c85
    I need to change the orifice on my coleman furnace. Can you tell me where the orifice is located?
  • Oct 12, 2011, 04:21 PM
    mygirlsdad77
    On the back side of the gas valve. Remove the gas valve and you will see the brass orifice. Why are you changing the orifice?
  • Oct 17, 2011, 09:44 AM
    JonesHVAC
    A furnace has many "orifices" aside from the one mygirlsdad77 pointed out. There are multiple orifices that are changed out to convert from NG to LP... what exactly are you trying to accomplish?
  • Oct 17, 2011, 03:58 PM
    mygirlsdad77
    Jones is correct. I jumped the gun. I just saw coleman and assumed it was a trailer house furnace :) Most furnaces do indeed have multiple orifices.

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