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-   -   Condenser Fan Motor Horse Power (http://www.diychatroom.com/f17/condenser-fan-motor-horse-power-146544/)

glcarter 06-09-2012 06:29 PM

Condenser Fan Motor Horse Power
 
I recently changed my Condenser Fan Motor as the other one locked up right before vacation. The motor was a 1/10 HP and the only motor I could find locally with the same RPM was a 1/2 HP. The old fan was .7 Amps and thew new one is 3.5-4.0.

1--What if any effects will this cause on my AC unit?

2--Can this cause any issues with my home electrical panel?

Had a local company here in Houston do a system check up and he said nothing about the fan motor but this may not be part of the service. The guys had only been doing HVAC for 10mos.

Any help would be much appreciated.

firedave19 06-09-2012 07:01 PM

No problems at all motor won't be working very hard so should last a lot longer maybe use a little more electricity but probably not noticeable long as rpms are same and it fits should be good

beenthere 06-09-2012 09:12 PM

It will have a short life span. It needs to work against a load close to its rating/amp draw rating. Get the proper motor.

glcarter 06-09-2012 09:25 PM

Thanks for the responses...

I was more worried about electrical load on house panel. I will research the fan motor and see if I can find something closer to the HP rating of the original motor.

firedave19 06-09-2012 10:39 PM

Under voltage and over amperage will shorten lifespan but pulling lower amps will not save ur money it will last long time

beenthere 06-09-2012 11:05 PM

Quote:

Originally Posted by firedave19 (Post 940092)
Under voltage and over amperage will shorten lifespan but pulling lower amps will not save ur money it will last long time

An under loaded PSC motor doesn't last long.

Download and read Fasco's motor facts.

firedave19 06-09-2012 11:13 PM

Don't have too 20 years experience tells me what works companies print that stuff to reduce liability so they can deny it was their fault

beenthere 06-09-2012 11:22 PM

Quote:

Originally Posted by firedave19 (Post 940102)
Don't have too 20 years experience tells me what works companies print that stuff to reduce liability so they can deny it was their fault

20 years means nothing.

The motor will have a short life span.

TopTechnician 06-10-2012 06:09 PM

Gentlemen,
Since the money has already been spent, why not let the motor last as long as it can?
As long as the increased amperage doesn't put the unit's total ampdraw over 80 percent of the circuit breaker's amp rating, you will not have any problems in your panel. What size circuit breaker do you have, and what is the unit's minimum circuit ampacity (MCA)?

beenthere 06-10-2012 06:31 PM

Quote:

Originally Posted by TopTechnician (Post 940541)
Gentlemen,
Since the money has already been spent, why not let the motor last as long as it can?
As long as the increased amperage doesn't put the unit's total ampdraw over 80 percent of the circuit breaker's amp rating, you will not have any problems in your panel. What size circuit breaker do you have, and what is the unit's minimum circuit ampacity (MCA)?

Cause it really bites when the motor fails on a hot Sunday, and no replacement is available.

carmon 06-10-2012 07:00 PM

beenthere is correct on this one......:thumbsup:

Yoyizit 06-10-2012 07:21 PM

If the new motor current is substantially higher than that of the old motor it may shorten the life of the contacts of the fan motor relay.

Are you sure about the current draw of the old (220v?) motor? It seems awfully efficient (44%) for a motor that small.

COLDIRON 06-12-2012 06:10 AM

Purchase a new motor that is like and kind to the defective motor. Same HP same Amp, same everthing or your looking for trouble like been said on a hot humid Sunday. Make sure you don't damage the fan blade and install it in the exact spot (height) on the fan shroud.


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