New condenser fan motor burned out

air-conditioningelectric motorhvac

AC technician replaced my condenser fan (through a home warranty service). The new fan worked for 5 min and stopped working after that. the fan motor was extremely hot (180F or more)
The old fan motor was 1.4 A 240 V and 1/4 hp. the new motor is also of the same configuration. the only thing i missed out is the RPM. i don't remember the RPM of the old motor and the new motor RPM is 1040. The AC technician took away the old motor and recycled it.

What can be the problem here?

I looked in some forums that the RPM mismatch can overheat the motor and damage it. i have no way of knowing the RPM of the original motor. I looked in manufacturer manual and there is no mention of it. is RPM matching that important?

http://www.nordyne.com/Literature/423a.pdf [ My unit is maytag DS3BD-036K ]

Very similar to question What could cause a replacement A/C condenser fan motor to only run for 3 minutes?

Best Answer

Does RPM effect motor life? More than I thought it would.

"if you change an 825 motor and put in a 1075, your HP load will move from 1/6th to 1/2... with the same blade. and the noise level will go up dramatically in the unit."-vstech, HVAC Talk

"Plus you're probably going to eat a few motors in the process."-Six

Five minutes sounds about right when you ask a 1/4hp motor to give you 1/2hp.

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