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Replacing Fan Motor - AC condenser unit

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Replacing Fan Motor - AC condenser unit Beowulf 07-12-2007
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Posted by Beowulf on July 12, 2007, 9:53 pm
The motor that spins the fan on the condenser unit outside my home
seized up today. I noticed that house fan was running, but cold air was
not blowing out the vents for the central air. When I went outside to
check the condenser unit the fan was not spinning, the motor was
humming, and was extremely hot to the touch.

I thought I had heard a squealing sound over the past couple weeks when
the AC unit would start in the early morning sometime, so I assume the
bearings in the fan motor seized. Is fixing this as straight forward as
buying a replacement motor, removing the old motor, and attaching the
fan to the new motor? Or is it likely that when the fan motor died it
took out other components with it (such as condenser coil or compressor)?

The specs I read off the side of the current motor:
Emerson
Model #: KA55HXCRK-9885
Part #: 8101-551
Volt: 230/208
Hz: 60
Amp: 1.7
PH 1

I think motors like these would be replacements:
http://www.alpinehomeair.com/viewproduct.cfm/productID/453055553/p/Emerson_3851
http://www.alpinehomeair.com/viewproduct.cfm/productID/453055555/p/Emerson_3852
http://www.alpinehomeair.com/viewproduct.cfm/productID/453055554/p/Emerson_6880

Any advice would be greatly appreciated. Thanks.

Plumbing 468x60
Posted by Edwin Pawlowski on July 12, 2007, 10:33 pm

> I thought I had heard a squealing sound over the past couple weeks when
> the AC unit would start in the early morning sometime, so I assume the
> bearings in the fan motor seized. Is fixing this as straight forward as
> buying a replacement motor, removing the old motor, and attaching the fan
> to the new motor?

Pretty much. Use care not to bend the fan blades. Clean them while they
are off also.


Or is it likely that when the fan motor died it
> took out other components with it (such as condenser coil or compressor)?

Anything can happen, but unlikely

>
> The specs I read off the side of the current motor:
> Emerson
> Model #: KA55HXCRK-9885
> Part #: 8101-551
> Volt: 230/208
> Hz: 60
> Amp: 1.7
> PH 1
>
> I think motors like these would be replacements:
> http://www.alpinehomeair.com/viewproduct.cfm/productID/453055553/p/Emerson_3851

This has the same amp draw as your so it is probably the correct one. The
other two are 1/2 HP while this is 1/4. See if the nameplate says what
yours is.

You can also check www.grainger.com and perhaps cross reference your motor
to be sure.



Posted by Beowulf on July 12, 2007, 10:52 pm
Edwin Pawlowski wrote:
>> I thought I had heard a squealing sound over the past couple weeks when
>> the AC unit would start in the early morning sometime, so I assume the
>> bearings in the fan motor seized. Is fixing this as straight forward as
>> buying a replacement motor, removing the old motor, and attaching the fan
>> to the new motor?
>
> Pretty much. Use care not to bend the fan blades. Clean them while they
> are off also.
>
>
> Or is it likely that when the fan motor died it
>> took out other components with it (such as condenser coil or compressor)?
>
> Anything can happen, but unlikely
>
>> The specs I read off the side of the current motor:
>> Emerson
>> Model #: KA55HXCRK-9885
>> Part #: 8101-551
>> Volt: 230/208
>> Hz: 60
>> Amp: 1.7
>> PH 1
>>
>> I think motors like these would be replacements:
>>
http://www.alpinehomeair.com/viewproduct.cfm/productID/453055553/p/Emerson_3851
>
> This has the same amp draw as your so it is probably the correct one. The
> other two are 1/2 HP while this is 1/4. See if the nameplate says what
> yours is.
>
> You can also check www.grainger.com and perhaps cross reference your motor
> to be sure.

Thanks for the reassurance that my assumptions were heading in the right
direction. Thanks for the pointers on finding a replacement motor, as well.

Posted by on July 13, 2007, 12:08 am

> The motor that spins the fan on the condenser unit outside my home
> seized up today. I noticed that house fan was running, but cold air was
> not blowing out the vents for the central air. When I went outside to
> check the condenser unit the fan was not spinning, the motor was
> humming, and was extremely hot to the touch.
>
> I thought I had heard a squealing sound over the past couple weeks when
> the AC unit would start in the early morning sometime, so I assume the
> bearings in the fan motor seized. Is fixing this as straight forward as
> buying a replacement motor, removing the old motor, and attaching the
> fan to the new motor? Or is it likely that when the fan motor died it
> took out other components with it (such as condenser coil or compressor)?
>
> The specs I read off the side of the current motor:
> Emerson
> Model #: KA55HXCRK-9885
> Part #: 8101-551
> Volt: 230/208
> Hz: 60
> Amp: 1.7
> PH 1
>
> I think motors like these would be replacements:
>
http://www.alpinehomeair.com/viewproduct.cfm/productID/453055553/p/Emerson_3
851
>
http://www.alpinehomeair.com/viewproduct.cfm/productID/453055555/p/Emerson_3
852
>
http://www.alpinehomeair.com/viewproduct.cfm/productID/453055554/p/Emerson_6
880
>
> Any advice would be greatly appreciated. Thanks.


Why not hire a competent tech to replace the motor and have them service
your equipment while they're there?
It could save you more money in the long run by having them do the service.



Posted by HeyBub on July 13, 2007, 11:05 am
kjpro @ usenet.com wrote:
.
>
>
> Why not hire a competent tech to replace the motor and have them
> service your equipment while they're there?
> It could save you more money in the long run by having them do the
> service.

But in the short run it's $450 vs $110.



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