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Wiring diagram appears on side of unit. With wire colors. Capacitor: each electric motor has a run-winding and a start-winding with capacitor. Both windings receive power. The start-winding gets a surge of power from the capacitor > and this starts the motor. The run-winding brings motor up to full speed. Copy following link for motor resources: http://waterheatertimer.org/Color-codewire.html#motor
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.
Is it going to run on 230V then? If so you would normally use red and black. The white wire should be a neutral and the ground wire is obviously ground.
Do you have a meter you can use to confirm the voltage between the wires? If you do you'll want to start with red and white since you seem to think black was not being used before. If the voltage reads 230 and the motor is set up for 230 then attach one wire to L1 and the other to L2...it will not matter which is connected where as long as one is on each terminal. Insulate the black and ground the ground lead to the motor ground screw.
If the voltage is not 230 between those two check between red and black. If that is the 230 then insulate white and put red and black to L1 and L2.
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.
Most motors will have a wiring diagram on them with numbers not colors, and show the wiring configurations for both voltages. If you do not have this then you may want to contact a motor shop and see if they can get it wired for you.
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.