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Old 10-25-2012, 09:48 PM   #1
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Does the size of the Blower Motor matter?


We were recently informed the bearings in our current motor of the upstairs AC have messed up and this is why the blower fan is not working. The handy man we hired then brought in another motor, but told us after he had already started working that the motor he brought us is 1/2 HP. The original was 3/4 HP. According to him the difference in HP was negligible and we would not notice any difference in how the AC unit cooled the house, nor how fast, how well, and said that this motor would last as long or longer then the original. The Originals was an Emmerson 3/4 HP motor unit with 3.8 AMPS, 1075 RPM, 60 Hz. and 3 speed.
The new was AO Smith MasterFit 1/2 HP motor with 3.9 AMPS, 1075 RPM, 60 Hz. and 4 Speed.

Was the handyman correct?
Or were we correct in canceling the job and looking for another 3/4 HP motor?

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Old 10-25-2012, 10:25 PM   #2
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Does the size of the Blower Motor matter?


you can increase horsepower, to an extent; you can not decrease horsepower.

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Old 10-25-2012, 10:34 PM   #3
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Does the size of the Blower Motor matter?


It isn't only a question of air movement for the motor. It's also a question of load on the motor turning the fan blades, size and weight of the squirrel cage assembly.
A properly sized replacement motor runs $150-$200, at least around here. Replacement isn't that difficult. I suggest you get the motor sized for your unit.
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Old 10-26-2012, 05:40 AM   #4
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Does the size of the Blower Motor matter?


By the amp rating of the 1/2 HP you would be ok. Myself, I wouldn't use it in place of your 3/4 HP though.
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