[wmu1979]

Hello, My old condenser fan motor stopped working so I replaced it and now the new motor overheats and stops running at 10 minutes. The old one was a GR 1/5 hp 1075rpm 1.2 amps. I replaced it with a century motor that is wired to be 1/5 hp 1075 rpms and 1.8 amps. could it be the amp difference that i causing the overheating. it is wired exactly as the diagram shows with brown and brown/white going to the provided capacitor and other two wires going to the contactor.

 

[Bitters]

Check to make sure the fan rotation is right. Air should blow out of the top.

 

[wmu1979]

It is blowing air out of the top, and i moved the fan up as much as possible so it is within the shroud. the new motor is around an inch longer, so the fan isnt quite has high in the shroud as the old one,but It feels to be moving just as much air as the old one.

 

[zappa]

Do you have an amp clamp to measure the current? Are you 100% certain of the wiring? A pic of the wiring diagram would be helpful.

 

[McGee]

Is condenser clean? Possibly bad capacitor? I have seen some motors lately that were dry(no oil in them). Like said an amp probe would help.

 

[beenthere]

At 1.8 amp that motor is nearly 60% stronger than the OEM one was.

 

[McGee]

I will never use a weaker motor but have used stronger ones similar to this with no issues.

 

[wmu1979]

Thank you for all the quick answers, i went over everything once more and found that I had the two wires on the separate cap on the same terminal. The wiring diagram didn't specify which post to put the two. I moved one of them to the common terminal and its been running for over an hour now with no problems.

 

[roughneck]

Did you replace the capacitor with the new motor?

 

[wmu1979]

The new motor came with a new capacitor. I replaced the old one as well,that the pump still uses. The old motor was a 3 wire and this was 4 so I was confused. Learned a lot about hvac in the process and saved a lot of money over hiring someone.

 

[supers05]

Take a pic of the name plate of the motor. Make sure the temperature rating is the same or higher. I've found that quality control is lower on name brand Motors these days. The bell ends are often way over tightened. I will loosen slightly them until the shaft spins freely. The HP rating matches, so don't worry about the amp rating difference. It's just wound differently. The most important part is to make sure your not drawing more current then it's rated for. Use an amp probe clamp. They can be cheap.