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  1. #1
    Join Date
    Oct 2010
    Location
    oregon
    Posts
    46
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    Carrier 58sx furnace

    Hey group question on a Carrier furnace. Lines coming off pressure switch. Pressure switch on bottom and line connects to box by IM which closes switch. Bit there's another line that comes on pressure switch into a T then into GV and burner box. What's it for, do etc? System works without it , read it's just a reference point?

    Thanks guys

  2. #2
    Join Date
    Apr 2001
    Location
    Western PA
    Posts
    1,801
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    The gas valve's regulator and the pressure switch use it as a reference point.

    Its a differential pressure switch, measuring the difference between the burner box and collector box, not ambient pressure in the basement.
    Jason

  3. #3
    Join Date
    Oct 2010
    Location
    oregon
    Posts
    46
    Post Likes
    Differential pressure switch that makes sense from multiple locations that easily explains why it's there in the burner box. Thanks bro

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