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    melmazbouh's Avatar
    melmazbouh Posts: 2, Reputation: 1
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    #1

    Nov 19, 2014, 12:55 PM
    I want to replace Air Pressure Switch has 3 wires with Air pressure switch has 2 wire
    The air pressure switch in my furnace has 3 connections, and I need to replace it with an upgraded part which has only 2 connections. 2 of the wires have the same color,Rose, while the third wire is red. Any help how to connect?
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
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    #2

    Nov 19, 2014, 03:42 PM
    On the old switch were two of the wires going to the same terminal? I don't know that I've ever seen a pressure switch with 3 terminals.
    bitters's Avatar
    bitters Posts: 348, Reputation: 12
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    #3

    Nov 19, 2014, 04:11 PM
    They make a universal switch that has 3 connecter's. Can you post a model number of your furnace?
    melmazbouh's Avatar
    melmazbouh Posts: 2, Reputation: 1
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    #4

    Nov 19, 2014, 05:57 PM
    Thank you guys. The furnace model # is 035-17715-001 Rev D (1102) / 035-17715-001 Rev E (0503). The part number, original, of the pressure switch is 024-27576-000.
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
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    #5

    Nov 19, 2014, 08:25 PM
    Bitters: The 3 terminal switch you mention, are the terminals Common, n/o, & n/c?
    bitters's Avatar
    bitters Posts: 348, Reputation: 12
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    #6

    Nov 20, 2014, 09:48 AM
    Grady, Yes they are. Had to install one last week. No time to order exact replacment.
    bitters's Avatar
    bitters Posts: 348, Reputation: 12
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    #7

    Nov 20, 2014, 10:09 AM
    I don't get any info with that model number. Is this a Colman furnace?
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
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    #8

    Nov 20, 2014, 07:03 PM
    It's made by Unitary Products Group (York) so it could be a York or Coleman. Switch, Pressure 024-27576-000

    http://postrv.com/HVAC/Gas%20Furnace...E%20(0503).pdf
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