Wiring of outside unit. I replaced old fan moltor with 3 pole 5.0/35 MFD cap. New motor has 2 pole cap. Where do I wire the purple wire from the compressor that went to the 3rd term of the old cap???

It sounds like you have replaced the fan motor. If so and it has 2 brown wires, you need to use a separate cap for it. (Commonly a 5 mfd/370~440 volt) There's a way to make it work with the original 3 terminal cap, but you really need to understand the process. Simply buying the correct fan cap, and using the 3 terminal cap for the compressor would be the easiest way to do this. On many condensing units, the yellow wire is the start wire, and connects to the "Herm" terminal of the cap.

You have bad capacitor on your unit it may not look bad but chances are it is just get the microfarad rateing of the side of the cap. should be like 55.5 55 7.5 something like that. Also check your fan motor. last. I have changed hundreds of caps this year. Russ

http://i21.geccdn.net/site/images/large/B186286_03.jpg

The brown and brown/white go to the cap. The Black is hot, L1 and White is L2. The yellw and purple wire are for the rotation, cw, or ccw of the motor.

this soounnds as though it for a 2 spped fan motor look at the old motor and see the RPM and then look at the new motor plate it shuld show ou which wire is for the speed required. Hope this helps ..Jon

There are two type capacitor. One for running capacitor for compressor and one for condenser fan motor by each separate capacitor. Some times two in one capacitor being used. Just check in your condenser unit, in your 2 in one capacitor, there are three parts and one has four pins and other two has each two pins where you can clip the wire.Remove existing wires and replace same with new capacitor.

Now, in this capacitor near each each part mention as "C" "H" " F". Cmeans compressor common and H means for compressor starting and F means fan starting. Be careful don't interchange any wire.
And also while replace capacitor don't add or reduce the mfd. Ex.. your existing capacitoris 35+3 mfd means 35mfd for compressor function and 3 mfd for fan motor function. Hope helpful.

Jim,

You have a special fan there. Hunter Originals are my specialty.

There are two ways to accomplish a slower speed with this fan.

1. A wall variable speed control, solid state, rated for 3 or more amps, regular fan controls will not work as your fan draws 2.5amps on high, not even new ones that are labeled for the Original.

2. Retrofit the fan to make it a three speed. If you're good with wiring, it's really simple. What you need is, a standard 3 speed pull chain switch, not a double pole one like cheaper/new fans have that use capacitor speed control, we are using cap. speed control, but not the same way they do. So you want an "SP3T" switch. You also need an 9 10 or 11 or 12 MFD capacitor (depending on how fast you want your low to be 8 is 20rpm, 11 is 75 approximately). You will remove the switch cap to your fan, and you will find your switch has a black, blue and red wire connected to it. Remove all wires, attach the black to L on your new switch, attach blue to 1, then you need 2 extra pieces of wire. Stick one wire in 2 and the second wire in 3. Now, get your capacitor and hook one side of it to the red wire and position 2, then hook the other side to the wire you put in position three.

Remember to get the Single pole switch for non capacitor speed control fans, if you get the double pole, both winding sets in your fan will be activated, which will draw double current and burn your motor out.


Also, are you aware that your fan uses oil (like an engine) ? and is not permanently lubricated?

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

You must use a NEW capacitor with the correct MFD rating and VAC rating for the new motor.
If you have 2 brown wires on the new motor they both go to the CAP. One on each terminal.
There should be a wiring diagram on the side of the new motor.

Find someone who sells this make for a direct replacement. Otherwise ww grainger and many other hvac repair companys with carry a replacement. Get the hp,voltage,amps and direction it turns. measure it to make sure it fits and mounts the same. Also some replacement motors has 2 wires for the capacitor so get new one and don't try to wire it to old capacitor. Most are duel porpose on new units and will run fan and compressor. Some new motors have the option to us only one brown wire for duel cap but make sure you use the correct brown wire one is solid and one with have a white stripe if it will work both ways. Also make sure Cap MFD matches new motor.

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.

Thank You