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Need help identifying air compressor motor (information from plate provided)

Need help identifying air compressor motor (information from plate provided)

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  #1  
Old 09-06-08, 01:40 PM
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Need help identifying air compressor motor (information from plate provided)

I was directed here from the tools forum. I have a sears compressor, with what appears to be an aftermarket pump and motor. I'm trying to figure out what HP my motor is. Here is everything I can interpret from the motor plate:

DOERR
Emerson Electric St Lous, MO USA

Defeinite Purpose
Compressor Motor LR22132

MTR REF R612184AC102B HP SPCL RPM 3450
Hz 60 FR L 143T KVA CODE F TYPE T
INS CLASS BR MAX AMB 40deg C DES PH 1
VOLTS 230 DUTY CONT SF 1.0
AMPS 21.0 EFF PFF
SFA

Thermally Protected Manual BRG SE BRG OSE

CUST PN
MC301527
I tried doing a few searches through Emmerson's eCatalog, but didn't have any luck. I found some similar motors through Google, but not an exact match.

BTW, what size breaker should I use if the motor pulls 21A?
 
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Old 09-06-08, 02:35 PM
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Most of the compressors with that type of hp rating use a 5hp 220/230volt motor. A 5hp draws about 20amps. If you try to use a smaller hp on that compressor, it will take longer to build up pressure and ware the motor out quick. Using a 30 amp breaker should be fine, for what you have.

Travis
 
  #3  
Old 09-06-08, 08:02 PM
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Your motor is a special design for home shop air compressors. Its true horsepower rating is about 3 although in some convoluted way it may be rated at 5 or 6 horsepower on the compressor.
 
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Old 09-06-08, 08:59 PM
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We tried a 3hp, with no luck. The motor got hot and quit within a week. I did some searching, and found it should have been replaced with a 5hp.That was two years ago. Still going strong today. That is why I say it is a five hp .Plus the amps are the same with the new 5hp as when I first bought the compressor. The compressor I have is an Ingersoll Rand.

Travis
 
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