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    jpence38's Avatar
    jpence38 Posts: 4, Reputation: 1
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    #1

    Jan 10, 2010, 06:47 AM
    Armstrong air ultra sx 80 furnace
    I have an Armstrong Air Ultra sx 80 model# GUJ075D10-2B. The furnace has satisfied the call for heat and everything has shut off and waiting for the next call. The problem is on the start-up. When the igniter starts the flame, it is like there is a small build up of gas in the heat exchanger and it ignites. It will create a loud "thump" in the furnace. Is this caused by a small amount of leaking gas, and if so , how can it be fixed?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jan 10, 2010, 08:12 AM
    You have a bad light off situation. You may try cleaning the burners and especially the flame jumper area. Is the situation persists I highly suggest you contact your local HVAC company for the repair since the gas pressure entering the unit may be to high for some reason or another.
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    jpence38 Posts: 4, Reputation: 1
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    #3

    Jan 10, 2010, 02:39 PM
    Thanks hvac 1000. That gives me a starting point. Trying not to get my wallet tapped too hard. If the cleaning doesn't work than I will have to call a tech. to come out to check the gas pressure. Thanks again. Jim
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    hvac1000 Posts: 14,540, Reputation: 435
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    #4

    Jan 10, 2010, 02:40 PM
    I hope you get it going it seems $$$ is a bit short right now for many people.
    jpence38's Avatar
    jpence38 Posts: 4, Reputation: 1
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    #5

    Jan 10, 2010, 02:43 PM

    When I have to replace this thing, what brand unit would you recommend as being best quality and warranty for price? Can you give me an opinion?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #6

    Jan 10, 2010, 02:45 PM
    All furnaces are designed to operate it is the install that makes the big difference. Get the best installer with the most experience. See article below.
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  1. File Type: pdf How to pick a Contractor.pdf (309.7 KB, 166 views)
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    jpence38 Posts: 4, Reputation: 1
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    #7

    Jan 10, 2010, 02:58 PM
    That's what I was finding out as I was looking into it. All the top brands are about the same. Excellent worksheet. Thanks again.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #8

    Jan 10, 2010, 03:19 PM
    Good luck with your decission.
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