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alimimoun 08-29-2013 02:16 PM

AC Condenser fan motor eplacement issues
I am having to replace the condenser fan motor due to bad bearing/burn out. Here's where i am in the process:

Got the new motor. The old one had 3 wires, red, brown and black. The new one has brown, brown/white stripes, black, and white.
I also got a new run capacitor. This is NOT a dual cap. Some weeks ago, i had to replace the capacitor but somehow could not get the dual, so i have to separate one. Start and run.

OK, so, I got most of the wiring straight now. The brown and brown/white go to the run cap, while the black and the white will go the contactor. However, with the last 3 -wire set-up), there was a black wire that connected the run cap to the start cap.
So my question is: what do i do with this black wire now that i have the two brown wires connected to the run cap? Does it mean that one of the terminals on the Start capacitor will be useless and i should cap it off?

Second issue has to do with hooking up fan blade: new motor shaft is way to long and i need to cut it. HOwever, even when it will be cut, i wont be able to get blade all the way up against motor as blades would it sides of it as well as some bolts from motor casing. So question is: will the set screw stay in pace and be strong enough to hold blade in place even if located mid-shaft?


wirenut1110 08-29-2013 03:18 PM

Hook the motor up according to the diagram on the motor.

Disregard how the other "other" motor was hooked up.

Any unused wire, just remove them.

Sounds like you bought a "universal replacement motor" if the shaft is longer, as long as it doesn't hit the compressor or anything else, there's no need to cut it.

Also, on those motors, any mounting studs can be cut if you don't need them.

I guess I should add, don't remove the nuts from the studs.

alimimoun 08-29-2013 03:32 PM

Thanks so much for this helpful reply!! So if i'm getting you right, it doesn't matter that one of the terminals on the start capacitor will be unused? if so, then i got this straight

Yes, the shaft was hitting top of compressor when i put everything back, so i;'m having to cut it.

also, any suggestion regarding my concerns regarding the mounting of the blade?
Thanks again

wirenut1110 08-29-2013 03:35 PM

As long as the set screw is on the shaft and tight, it'll be fine.:thumbsup:

alimimoun 08-29-2013 03:42 PM

Great! thank you

alimimoun 08-30-2013 09:20 AM

Did the work last night and everything works like a charm. I had to cut the shaft, but that's the only adjustment that was needed

Thanks again

alimimoun 09-02-2013 11:20 AM

Quick update since fixing the issue:
The unit outside is vibrating. It didn't use to do that. Could this be due to fan out of balance? The blades did not get or damaged that i can recall..but. could they have been put slightly out of balance when tightening the set screw?

k_buz 09-02-2013 11:22 AM


Originally Posted by alimimoun (Post 1236055)
Did the work last night and everything works like a charm. I had to cut the shaft, but that's the only adjustment that was needed

Thanks again

I'm guessing your problem stems from the above.

wirenut1110 09-02-2013 05:33 PM

Don't know how your motor was mounted but make sure it's in there square if it has the strap around it.

Make sure all the bolts/nuts are made up tight.

You can find a fixed point on your condenser and measure to each blade to see if any of them are bent.

Also, was the shaft size the same as the old motor?

k buz: they make these universal replacement motors with long arse shafts on them so, some require shortening. Usually, if it doesn't hit the compressor or something else in there you can leave 'em long.

alimimoun 09-02-2013 05:57 PM

thanks for that.
Yes, the shaft is the same size. it's not hitting anything, so i'm leaving it the way it is

SOmeone told me somehting about a drain plug i should take out. ANy idea what this is?


wirenut1110 09-02-2013 06:27 PM

Yeah it's a condensate drain plug.

Remove it, it's usually a little black plug on each end.

Edit: remove the plug that will be on the bottom. Leave the one in the top so water can't get in

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