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A/C MOTOR STOPS RUNING AFTER 10 MI I REPLACED WITH NEW FAN MOTOR AND CAP

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Hi, I am not sure if it is the indoor or outdoor motor you have replaced. Most likely the outdoor condenser fan motor. If it runs for 10 minutes and stops, its going off on internal over load. Touch the motor carefully when it stops to see if the body of the motor is hot! If it is, make sure you have the run cap wired properly and nothing mis -wired. It is drawing more amps then the motor is rated for if its going off on internal. It will tell you the RLAs on the motor. They will give you a safety factor of about 1.5 amps also. If the fan motor blade is not in the right position on the shaft, it will draw more amps. If you had a amprobe to check this that would tell you. Most folks don't. You can move the blade in or out and this will cause the motor to draw more or less amps also. You would have to do this to see if it helps in the direction you move it unless you get the amprobe to check and watch. This is the problem. Make sure everything is right. You say you replaced the cap which is good as if you did not, the motor will do this with the old cap. Check the motor like I said for heat and you will know that's the reason it shuts off on overload. Make sure the outdoor coil is clean also. Try these things with the prop/blade and see if you can position it to draw less amperage. Keep me posted.
Sincerely,
Shastalaker7

Posted on May 08, 2010

  • Robert Horton
    Robert Horton May 09, 2010

    Checking back to see how its going. Let me know how hot that motor is when it stops running. Check to see if the bearings are sealed or if there are oil holes at each end of the motor body.If you do, you will see a aluminum or plastic plug you can pull out to drop a couple of drops of 20 weight oil onto the bearings. This wouldn't hurt. Keep me posted,
    Shastalaker7


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Run the motor as long as it will run, carefully feel the motor and see if the case is extremely hot, if so, the internal safety is tripping to protect the motor, after a cool-down period the safety should reset. If this is the case, verify proper Horsepower rating, rotation of the motor, proper amp draw during operation and proper capacitor connection and size. Hope this helps.

Posted on May 08, 2010

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