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For one, thank you for posting all the info, it really helps! On your new motor, the white has became your purple, black is black, and your brown/brown and white wires go to each side of the new capacitor, there should only be 2 terminals. You can leave the "Fan" terminal blank on the old capacitor now. Just be sure to attach the new capacitor somewhere secure, they are smaller, but can be a pain. So just to recap: Black is still black. White is what purple used to be (Com) Brown on 1 side of new capacitor Brown/White on opposite side of new capacitor.
Does the motor data plate say anything about the motor. You can hook up a motor like yours with 3 wires. First use an ohmmeter and check the resistance between the brown/white wire to the black then the yellow wire. The resistance between brown/white and one of the others should be pretty much 0 ohms. If not check between the brown wire and the black and the yellow. Which ever wire has 0 ohms with the brown/white wire is the common leg. You can put a wire nut on the brown/white, it will not be used. Next the brown should be for the start winding and the other wire left over will be the run winding. Then connect the common to L2. L1 will go to the run winding and one side of the capacitor and brown will go to the other side of the capacitor. I hope this isn't too confusing. Let me know if I need to explain it better.
OK, locate the terminals on the capacitor marked "HERM"(Compressor lead), "FAN", and "COM".(common)
HERM and COM remian as they are.
The wire going to "FAN" (usually brown) will be placed on either terminal of the new capacitor. (This is the ((usually brown)) wire comming off of the fan motor.) An additional wire needs to be run from the other terminal of the new capacitor to the "COM" on the old capacior.
What you are doing is bypassing the fan side of the old capacitor but still using the compressor side of the old Cap.
The fan should have a wiring diagram on it to help identify the wires if there is no brown wire. The other two wires will be identified on the wiring diagram as well, but one typically goes to the contactor and the other to the board.
If new motor is 4 wire verses 3 wire use seperate capacitor between brown wires and don't use terminal on 3 pole cap. If this motor has a white strip on one brown wire you can wire it the old way using only 1 brown wire and tape off the other. Can't remeber this morning which brow wire to use . I need to leave. Goole replacemotor with 2 brown wires for more info or call where you bought it. Sorry got to run.
The black and white wires get 220 from the contactor. The brown and brown/white go to the capacitor. I do hope you bought a matching capacitor to go with the new motor. They don't cost much and make the hook-up way easier.