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enter image description hereIt is an old Rheem RGAA-100C furnace, On the old motor the wires was: White, Brown, Red, Black and Blue. On the new Motor it has Brown, Brown/White, Black, Red, White, and Blue. I don't know how to wire it back. They do not make the old motor anymore, this motor was the replacement. Could you please help.

On the circuit diagram on the motor says:

  • Br/Wh to Cap.
  • Br to Cap.
  • Wh to Line.
  • [Blk (Hi) or Blue (Med) or Red (Low)] to Line.
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    Do you still have the old one, or know its make and model number? Did it have a circuit diagram? Do you have the new one's make and model number, and does it have a diagram? – keshlam Aug 9 '15 at 2:53
  • Rheem RGAA-100C is our furnace and no, I don't have the old motor anymore. The wires from the motor goes into a junction box on the blower housing, the main power leads come the junction box above and then goes into the blower housing junction box. On the circuit diagram on the motor says: Br/Wh to Cap., Br to Cap., Wh to Line, [ Blk (Hi) or Blue (Med) or Red (Low) ] to Line. The power leads that come into the junction box are: Red, Black and White, From what I see, I should put the power leads white to cap, black to black on motor wires, so what do I do with the power leads red? – Elmore Aug 11 '15 at 4:03
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There should be a schematic printed on a sticker on the motor. Without knowing the make and model, or looking at the diagram. I'm guessing based on other motors.

One common "standard" is as follows:

  • White = grounded (neutral) (clockwise).
  • Black = High speed.
  • Blue = Medium speed (medium low).
  • Red = Low speed.
  • Brown = Run capacitor.
  • Brown w/ white = Run capacitor.
  • Green = Ground.
  • Yellow = Medium speed.
  • Purple = Grounded (neutral) (anticlockwise).

Optional wiring available on some motors.

However, without the make and model, or the schematic, this is just a guess.


Update

The two brown wires (Br and Br/Wh) should be connected to the capacitor. If you don't have one, you may need to install one. The brown wire from the old motor should have been connected to it, so try to remember where you removed the brown wire from.

The white wire from the motor, should connect to the white wire in the junction box. This is L2/neutral, and completes the circuit.

The remaining wires are for selecting the motor speed (Blk, Blue, Red), so you're going to have to figure out which speed you should be using. If you can remember which color wire was connected to the red wire in the junction box, that should be the same color wire to hook back up. Typically the blower is run at low speed when in heating mode, but that's no guarantee that your equipment was set up that way.

I wasn't able to locate any documentation on your equipment, and without a schematic I can't be any more specific. If you could include a good photo of the schematic, I could show you where to make the connections. You should be able to find a schematic in the manufacturer's documentation, or on the furnaces access panel.

  • Rheem RGAA-100C is our furnace and no, I don't have the old motor anymore. The wires from the motor goes into a junction box on the blower housing, the main power leads come the junction box above and then goes into the blower housing junction box. On the circuit diagram on the motor says: Br/Wh to Cap., Br to Cap., Wh to Line, [ Blk (Hi) or Blue (Med) or Red (Low) ] to Line. The power leads that come into the junction box are: Red, Black and White, From what I see, I should put the power leads white to cap, black to black on motor wires, so what do I do with the power leads red? – Elmore Aug 11 '15 at 4:04
  • i do have a pic but i was not sure how to get it to you. – Elmore Aug 11 '15 at 13:15
  • This should explain how to add an image. – Tester101 Aug 11 '15 at 13:32
  • I tryied to added the pics of the motor diagram and the wire diagram for the unit above, but it would only let me save one of them, this the diagram of the unit. – Elmore Aug 11 '15 at 18:29
  • @Elmore Did you locate the capacitor in the furnace? – Tester101 Aug 11 '15 at 19:13

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