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Which wires goe where on my furnace cicuit board?

Our basement got flooded and we had to buy a new "integrated furnace control board". Like a dummy I pulled all the wires off without writing which colors went where. Does anyone have a picture of one? It's for the model #GMS90703BXA .I think all the white wires go on the nuetrel terminals. But there are 3 black wires a blue, orange and red. Please help me before it snows, lol.

4 Answers

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  • Greg D
    Lv 5
    9 years ago
    Favorite Answer

    This PDF is the manual for your furnace. Open the PDF and go down to the LAST page, page 36. Hold control and then mouse wheel up to zoom in.

    http://www.alpinehomeair.com/related/GCS9%20GMS9%2...

    -On the left it shows your "circulator blower". This motor has a lot of wires, as you can see.

    -Make sure White is connected to the "CIR-N" terminal on the board.

    -Then connect the Black (high), to the "Cool" terminal on the board

    -Then connect the Orange (med low) to your heat terminal on the board.

    -The rest of the blower terminals should be connected to the "PARK" terminals on the circuit board.

    -Your humidifier (if you have one and its 120v) wires are connected to the "Hum-H" and "Hum-N" terminals on the board. if 24v connect them to the "W" and "C" on the thermostat connections.

    -The transformer black wire should be connected to the "XFMR-H" and white wire to the XFMR-N" on the control board.

    -The Black wire from your compartment door switch (little switch for the blower door to access the board) should be connected to "Line-H" terminal on the board.

    -The white wire from main power supply should be connected to "Line-N" on the board.

    -The white wire from the ignitor should also be on the neutral strip.

    Now on your thermostat connections.

    THE COLORS MAY NOT BE RIGHT. YOU WILL NEED TO CHECK THE THERMOSTAT AND CONDENSER.

    Y - (call for a/c) Yellow from the thermostat, and red or yellow to the condenser.

    W - (call for heat) White from your thermostat.

    R - (supply power) Red to your thermostat

    G - (call for fan) Green from your thermostat

    C - (common) White/yellow from condenser, and brown/grey/black from thermostat (you need to check)

    Hope that helps. Double check ALL the connections. If you miswire anything, you will be changing the board again.

    Source(s): HVAC/R Service Tech
  • ?
    Lv 6
    9 years ago

    We can't be much help online. You'd be best off calling a furnace repairman at this point. He will know how to install it properly. If you hook it up wrong, you could damage the board. I wouldn't take that risk.

  • Anonymous
    9 years ago

    you had better call a tech you are already wrong the white are not neutral they are the heating wires blue is common red is feed if you cross any of these wires you will cause yoursell a bigger headache. but i'll bet you have a lkot more trouble than the board if it was flooded.

    Source(s): htg clg
  • ?
    Lv 6
    9 years ago

    Look on the back of the access panel, there should be a schematic. There is no telling where those wires run, from here anyways...

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