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    poncho1112's Avatar
    poncho1112 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Oct 12, 2011, 03:29 PM
    Coleman furnace model number 7970c85
    I need to change the orifice on my coleman furnace. Can you tell me where the orifice is located?
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
    		  
    #2

    Oct 12, 2011, 04:21 PM
    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?
    JonesHVAC's Avatar
    JonesHVAC Posts: 173, Reputation: 12
    Junior Member
    		  
    #3

    Oct 17, 2011, 09:44 AM
    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?
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
    		  
    #4

    Oct 17, 2011, 03:58 PM
    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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