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    Dr.B's Avatar
    Dr.B Posts: 1, Reputation: 1
    New Member

    Aug 16, 2006, 06:27 PM
    Color coded wires
    This is a two part question:
    1. I have a 28 year old Carrier furnace model #31MM220120 and need to know which wire color matches with the newer motor colors. In the furnace there are wires such as orange, white, beige... How do I match up the old color coded wires with the new color coded wires?

    2. The replacement motor has the following colored wires: yellow/green, brown, white,black, blue,red, brown/white,yellow connected to purple and orange connected to brown. What is the meaning of each of these colors or what does each color connect??
    esquire1's Avatar
    esquire1 Posts: 2,483, Reputation: 209
    Ultra Member

    Aug 17, 2006, 03:02 PM
    White is line voltage from contactor. Red is low speed, blue med speed and black is high speed connected to relay. The yel and purple are for the rotation of fan and the brn& brn/white go the capicator. Normally this is indicated on the motor. Cap off the unused speed wires not being connected to the relay
    esquire1's Avatar
    esquire1 Posts: 2,483, Reputation: 209
    Ultra Member

    Aug 18, 2006, 10:18 AM
    Connect the brn&brn/white to the capicitor-white to contactor-black(high speed) to fan relay. Cap off the red and blue. The yel & purple are the rotation of fan. They can be changed to switch the rotation of fan.
    dvqjimbo1's Avatar
    dvqjimbo1 Posts: 28, Reputation: 2
    New Member

    Sep 27, 2006, 03:25 PM
    Are the wire color codes you explained on 4-17-06 pretty much standard, or just for carrier ?
    esquire1's Avatar
    esquire1 Posts: 2,483, Reputation: 209
    Ultra Member

    Sep 27, 2006, 03:32 PM
    Normally these are standard through the industry

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