ac compressor turns on, fan turns on for a few minutes and then stops


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Old 11-02-14, 03:35 PM
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ac compressor turns on, fan turns on for a few minutes and then stops

So recently my external ac compressor will turn on as it should and the fan starts running but then the fan stops a few minutes in and the compressor keeps going until I shut it off. Power doesn't seem to be the issue as the compressor runs constantly when activated and the fan also starts working and then stops so the fan seems to be ok motor wise. I read something about a fan conductor or compacitor that might need to be changed that is usually silver? Should I open it up and look for something like that that. It's a Payne compressor. Thanks
 
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Old 11-02-14, 03:51 PM
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It is most likely a dual capacitor that requires replacement.
 
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Old 11-02-14, 03:54 PM
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Your probably talking about the capacitor.
 
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Old 11-02-14, 03:55 PM
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This is what I am thinking too, gonna see if I can track one down tommorow locally instead of buying online
 
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Old 11-02-14, 03:59 PM
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It could be the motor tripping on overload. This is internal of the motor, FYI.
 
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Old 11-03-14, 09:45 AM
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Well I pulled the capacitor and am picking up a new one at Grainger tomorrow so we will see if it fixes it. I suppose it could be the fan shutting down on overload but the fan only will run for less than 5 minutes before it stops, so not sure if it would really overload that fast? Anyway we will see if this fixes it.
 
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Old 11-04-14, 09:26 AM
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Yes, it could overheat in less than 5 min. Keep us posted.
 
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Old 11-06-14, 11:18 AM
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It is the fan motor :(

Unfortunately it looks like it is the fan motor. Should I hold onto the new capacitor to use with the new motor and which specs do I have to match with my old motor to make sure I have the right one. My old motor had a HP 1/4, AMB 40C, RPM 1075, Voltage 230 and a 48Y Fr and it has a 6" shaft, though it seems like it is much longer than needed to be, it almost touches the top of the condenser. (Large black motor below, assuming that is the condenser).

I found this one at Grainger that looks like a match.
http://www.grainger.com/product/4MB2...oneId=IDPRRZ13

Any problems with this one do you think?

Also, do you need a special tool to remove the fan blade from the shaft? I saw it has this screw with a square head attached to this large round bolt., I wasn't able to turn the screw or know how to remove the large bolt. I'm looking around for youtube videos but would appreciate any links.

Thanks!
 

Last edited by Jolie O'Dell; 11-06-14 at 11:45 AM.
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Old 11-06-14, 11:32 PM
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Turn off the power to the outside unit , FIRST !

Take pictures of where each motor wire connects to each electrical component . So you can get it wired back correctly .

Mark the fan blade with a Magic Marker , as to which side faces the motor .

Remove the old motor , if you have not already . Squirt some of your favorite penetrating oil on the fan hub ( including the set screw ) to motor shaft interface and let it soak overnight .

After you get the fan blade off , take the fan motor with you when you go to buy a replacement motor . Hang on to the new capacitor . If the new motor has a shaft that is too long , measure the length of the shaft on the old motor .

Cut the shaft off , on the new motor , so the shaft is the same length as the old motor . Use a hack saw & then a file to smooth up the end of the new motor shaft , so the fan will slide back on . I would grease the end of the new motor shaft & the inside of the fan hub . I would also remove the set screw and grease it also .

Install the fan blade on the new motor shaft , with the same side facing the motor , as it was on the old motor . With the fan the same distance from the end of the new motor , as was the blade positioned on the old motor . Tighten it all down . Make sure you can easily spin the fan by hand .

Start putting every thing else back together . Pay particular attention to getting the electrical tie in correct . The motor may or may not have come with a new capacitor . Did you hang on the the new one you purchased ?

Turn the power back on and test it out . Make sure the motor is rotating the correct direction and the air flow is in the correct direction .

By the way , if you have a local Johnstone Supply , I prefer them to Granger .

God bless
Wyr
 
 

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