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Furnace motor drawing high amperage
I was doing a routine ac check on Carrier system with a 90 + furnace model 58MXB installed in 2007. The furnace has had the blower motor replaced in it twice. While checking the unit today I noticed the motor that was replaced two years ago was drawing 7.7 with a FLA of 7.5, The service factor on the motor is 1.0. I know that this is barely over FLA, but I normally see these 1/2 hp motors drawing 4-5 amps at maximum. The capacitor is good (10 mfd) and the voltage going to the motor when it is running is 118 volts. Nothing seems out of the ordinary with the ductwork where the motor could be overloaded with oversized ductwork. This is in a fifty year old house with all metal ducts, no flex. I would normally say replace the motor, and re measure, but from what I can tell the motor has been drawing slightly over FLA since it was installed, and this could be a reason why the other two motors failed. After an hour of running the motor was not particularly hot to touch, not like an overloaded motor normally is. Any suggestions would be much appreciated. Thanks to all.