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    tdsmothermon's Avatar
    tdsmothermon Posts: 1, Reputation: 1
    New Member

    May 13, 2009, 12:52 PM
    Wiring Diagram For Friedrich Furnace
    Need to change the blower speed on an old Friedrich central air furnace... model number GHA075NDC. Wiring bloc has termanals for fast, medium fast, medium slow and slow. Anyone have service manual, wiring diagram or remember wire locations?
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
    Ultra Member

    May 13, 2009, 01:55 PM

    You should have 4 wires coming from the motor
    Black- high

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