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Wire an AC fan motor

Replacing a 3 wire motor with a 4 wire motor : purple to capacitor,purple/white to capacitor, black to line, white to line im not sure where to put this white wire?

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  • steve
    steve May 11, 2010

    Is this in the condenser or air handler?

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  • Master
  • 358 Answers

Look at the schematic on the new motor , but i think if the 2 purple wires go each one to each side of the capacitor, the black to line and you need to connect the other line which Im 99% sure is the whte wire which is the only one left.Remember you need 220v between the fan motor lines for it to work.

Posted on Oct 01, 2009

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Tip

How to Reverse the Rotation of Single Phase Capacitor-Start Electric Motors


Reversing the rotation of electric motors can be done easily with 3-phase motors. This can be easily achieved by swapping the connection of any two motor leads. But 3-phase motors are usually found and used for industrial purposes. The ones found and used in our homes, from water pumps to electric fans, are single phase capacitor-start type motors. Unlike 3-phase motors, reversing the rotation of single phase electric motors is no easy task. Swapping any two motor leads will not result in the reversal of the motor rotation. Analysis of the motor windings and connections are necessary before any modification can be done to achieve the desired result. Let's take a 3-speed single phase capacitor-start electric motor with electrical diagram shown below as an example. Make sure the motor is disconnected from the power supply before attempting to follow this tip. This tip is intended only for individuals with electrical knowledge, necessary tools, and understand the risks associated with handling electrical equipments and devices.

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The first step in the process is determining the start winding which is connected to the line (AC white) and to one side of the start capacitor. To accurately determine the start winding, disconnect all motor leads from the start capacitor and the speed switch for multi-speed motors and then setting your ohmmeter to the lowest scale (R x 1), measure the resistances between the AC white line and each of the motor leads connecting to the start capacitor. The one with the least resistance is the starting winding lead.

Once the start winding lead going to the capacitor is determined, reconnect the capacitor then connect the black AC line to the found start winding lead (marked X). Connect the white AC line to L of speed switch, the motor lead formerly connected to AC white to 3, red to 2, and white to 1 as shown below. Leave the green/yellow ground wire connection as is.

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Below are the wiring modifications for 2-speed and single speed single phase capacitor-start electric motors.

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on Jan 11, 2011 | Dryers

1 Answer

Replaced a ge condensor fan 3 wire with new dayton the wires are different...old fan has a wire connectort mouted to it orange,black yellow, the new one 2brown 1 with white stripe, purple, black, i have...


the new ge fan requires its own capacitor, the brown and the brown/white go direct to new fan capacitor. black to relay (leg one of power) purple to relay (leg two of power. the compressor will have a wire to the relay and the other to the herm terminal. you now will have nothing to the original capacitor fan terminal.
The new motor will have the diagram showing this. you need the capacitor that goes with the new motor. the grainger guy should have sold that to you with the motor.

Apr 11, 2013 | Heating & Cooling

1 Answer

I am replacing my old a/c fan motor with a new one. The old motor is an A.O Smith B13400-251 and has black, brown, and a purple wire and was connected to a dual capacitor. The new motor is an A.O Smith...


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.

Hope this helps get you to cooler days!

Jun 29, 2012 | Heating & Cooling

3 Answers

Heil outside fan motor 3 wire rd/blk/br new dayton motor 4 wire blk /br /purpule /brown with white strip Need help on wiring


Hi, the new motor takes its own capacitor to run it. This is what the 2- brown wires are for, one will have a white stripe. You will need to but a seperate run capacitor for this motor, a 5 uf, 7.5, or what ever it calls for. they should have told you when you bought the motor. It will have to spade connectors on it where the brown wires connect alone. Use the dual capacitor if that is what you have for the other 220 volt wires.Black and purple will be your 2 hot wires.You can connect either one to the old capacitor on the fan terminal and the other to the load side of the contactor, so when the contactor closes it will energize the motor.Or, take both the black and the purple wires and to the load side ( outlet side ) of the contactor, connect one to one side and the other to the other side. The line side is where your 2 hot wires that connect to the contactor from the incoming wires from the electrical box, you want to be on the other end. I would connect the black to the contactor load side and purple to the old capacitor as long as the old wiring is still on it as it has to be fed by a hot wire from the contactor. Each wire, blk, and purple has to have 120 volts to each one and you can get this a couple of ways. The contactor has several terminals that are not used and if you wire them on the outlet side, they will only be energized when the contactor is closed on a call from the stat, very easy to do. You will have to get a coulple of crimp on connectors to put on the ends of the wires, but the brown ones should already have them for this capacitor. Do not try to put the brown wires on the old run capacitor as you will burn out the new motor! Go get the small run cap for these 2 wires for about $10. I know that you can do this wiring change just remember the blk is hot 120, and purple is hot 120, = 240.volts. If you have removed all of the wires from the old capacitor, then use the contactor to connect to. The compressor wires must stay on the old run cap on the hermetic side and this old cap. must be fed by a hot wire from the contactor to the common terminal, that is marked with a C..If you look at the new motor diagram, it will show you also. Please dont forget to rate me as I know you will be kind, and I will check in on you to see how you are doing. Get this capacitor and it will run. This is a must!! Please keep me posted.
Sincerely,
Shastalaker7
A/C, Heating, & Refrigeration Contractor

Sep 07, 2010 | Goodman CLQ36AR49 Air Conditioner

1 Answer

I have an old york unit model #HICF030506a and just replaced the fan unit but forgot where to connect the 4 wires . I have a tan, tan w/white strip , black , and purple wire. Can anyone help???


Did the old fan use 4 wires or 3 wires. If it used 4 then connect the brown and brown/white to the capacitor. Then connect the Black to L1 and Purple to L2. If it used 3 wires then tape up or put a wire nut on the brown/white wire. Connect the brown wire to the Fan terminal if the capacitor has 3 terminals or to either side if it only has 2 terminals. Look at the motor data plate. It should have the wires labeled on it. Purple should be the run wire, connect it to the Comm terminal of the capacitor if it has 3 terminals or the opposite side from brown if it has 2 terminals. Another wire should go from this connection to L1. Then connect the Black wire which is common to L2. I hope this isn't too confusing. Let me know if I need to explain it better. Also if the motor data plate says that Black is run and Purple is common just adapt the instructions above to the wire colors.

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Unsure of capacitor terminations for ao smith condensing fan moto


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.

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1 Answer

Wiring a 220v single phase motor and capacitor


Black and white are usually power. an ohmmeter will confirm. Brown are for capacitors. There is almost always a diagram on the motor someplace. Eric

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1 Answer

Told motor was bad, replaced motor, new motor does not run


Black to Black, Purple to White and the new motor requires a run capacitor which brown goes to one side of capacitor and brown/white goes to the othe side of the capacitor. This is providing the old motor is a single speed. If the old motor is a two speed you have an incorrect replacement motor.

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1 Answer

HELP!!! Help wiring new motor for CKL60-1


  1. This is what your wiring should look like if you are using two caps. then you should be using a potential relay as well. This is the diagram for using a potential relay. Hope it helps you.
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