Buzzing from outside AC unit - outside fan is running

AngryOldWhiteGuy · 2010-07-18T19:03:33+00:00

Hi - we have a typical home AC system - ours is a Ruud - the model number on the outside unit is UAKA- 037JAZ. It's been very hot here in Texas - over 100 all day long, but the system is working OK and cooling the house - plenty of cool air coming out of all the vents - the AC runs a lot these days, but it always has when it's very hot outside since we've lived here - I guess that's because it's an older unit (1996) and not as efficient as some of the newer units. The filter has always been changed regularly.For several months now, I'm hearing a loud buzzing noise from the outside unit when it's running - the fan spins OK and there's hot air coming off of the unit - the noise is nothing that keeps us awake at night, but certainly noiser than my neighbor's units - they were replaced within the past few years and they're newer.Is this kind of noise typical of the older units?? If not, what am I likely to hear is the main problem from the AC repair guy if the unit goes out and I need to make a repair call?I had something on the outside unity replaced a few years ago - I think it was the start capacitor.Thanks!

Jul 18, 2010 21 Replies

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Meat Plow 16 years ago

Makes sense. Gap causes eddy currents I suppose. Same things apply for transformer/inductor core design.

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jeff_wisnia 16 years ago

In my experience, when the relay is located outdoors and not well sealed from the environment, what happens is that the D shaped copper "shading coil" at the armkature end of the relay coil corrodes into nothingness and can no longer serve its function of creating an out of phase AC magnetic field to prevent the buzzing of the relay armature.

(More than you needed to know, huh?)

Jeff

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