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Thread: Condenser fan running backwards

  1. #1
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    Condenser fan running backwards

    https://youtu.be/B26K5kDXuzw

    The company I work for has been here over 10 times, no one noticed? This is my first AC service here, I called York to verify the didn't have any condensers that sucked air in the top and blew through the coil, I've never seen one before, but had to check. The motor looked original, and had the original molex plug and matched the manufactures sticker, couldn't verify if it was the original or not, pretty sure it is. Homeowner has lived here 11 years, she doesn't think anyone did anything to it, it's only 15 years old, I'm thinking someone changed the fan blade at some point and didn't get it right. Anyone else ever seen this? What do you think happened?Name:  ImageUploadedByTapatalk1429328511.597556.jpg
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    There are two ways to do things, Right and Again.

  2. #2
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    Change your capacitor & see what happens . Was working on a Coleman 4-5 years ago & the same happened . I was there a month before and Checked the system out for another reason . I think indoor fan belt broke ?? Not sure but I checked all my basics & it looked fine . I came back and noticed the fan running backwards ... I was half way on changing the motor out when I thought of that . Fan worked fine after I installed a new Capacitor , but I sold them a new motor anyway . I figured that couldn't of been good for the motor & I didn't want to be back there the following week.

    One more thing the motor name plate says (CWLE) which means Clock wise Lead end . Which means the if your looking at the motor from the side where the wires come out the back of the motor the fan blade should turn clock wise . Which it looks like it has the right fan blade . Hope this helps

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  4. #3
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    Yea cap is bad...that's the factory blade...usually aftermarket blades don't have fixed hubs...if it isn't a replaceable hub it either was taken from another brand unit or something is awry...Bad cap can make it run backwards...
    "If history repeats itself I am so getting a dinosaur"

  5. #4
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    Cap was rated at 5 mfd, and read 4.93, it was turning counter clockwise from the lead end(the back where wires would come out) motor said cwle, I thought maybe I was remembering lead end wrong. So it really was running backwards for some reason.
    There are two ways to do things, Right and Again.

  6. #5
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    Could also be a bad start winding!

  7. #6
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    Just out or curiosity if the motor is good and the cap is good do you know how to change direction on that motor without it having reversing leads???

    The motor screams replace me, I just wonder how many people would actually reverse it to get them going...
    "If history repeats itself I am so getting a dinosaur"

  8. #7
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    its wired wrong. motor line and common is wrong at the cap.

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  10. #8
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    Quote Originally Posted by Hrdworkingacguy View Post
    Just out or curiosity if the motor is good and the cap is good do you know how to change direction on that motor without it having reversing leads???

    The motor screams replace me, I just wonder how many people would actually reverse it to get them going...
    I think I would get it going, test the motor thoroughly and document it. I would recommend a replacement motor. if it was a 50-100 dollar repair I would think different but some people would have a cow.

  11. #9
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    I was just asking if anyone knows how to reverse the rotation, if it's wired correctly, the cap is good, and the motor is backwards, but isn't reversible...

    Just want to see what kind of answers we get.
    "If history repeats itself I am so getting a dinosaur"

  12. #10
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    Quote Originally Posted by Hrdworkingacguy View Post
    I was just asking if anyone knows how to reverse the rotation, if it's wired correctly, the cap is good, and the motor is backwards, but isn't reversible...

    Just want to see what kind of answers we get.
    oh, sorry, lol. i thought you were asking if we would replace the motor no matter what.

  13. #11
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    Quote Originally Posted by Hrdworkingacguy View Post
    I was just asking if anyone knows how to reverse the rotation, if it's wired correctly, the cap is good, and the motor is backwards, but isn't reversible...

    Just want to see what kind of answers we get.
    Easy pull the rotor out and reverse it
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  14. #12
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    Quote Originally Posted by buttwheat View Post
    Easy pull the rotor out and reverse it
    Give that man a cigar...

    Wonder how many people on here have run to a parts house or opened a parts house having a motor on their truck that's right except for direction and didn't realize this...It happened quite often at my last company I worked for...
    "If history repeats itself I am so getting a dinosaur"

  15. #13
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    Bearing are maybe worn out , just replace it.

  16. #14
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    I caught one of these my first year out, head was way to high. Lucky for me there were two identical units side by side, one was blowing air on me, one was sucking air in. Hmmm...

    I've long since forgotten the explanation; windings went south and reversed or something. Ultimately it doesn't matter; if it has all it needs to fly and fly straight, and it doesn't - it's bad. Every once in a while they just fail in a weird way and it's noticed before the bearings lock up or the windings burn up.

    I remember being so new, a few of the other techs were being nosy and doubting me and saying "no way - you condemned a perfectly good motor because you don't know how it's supposed to be wired." Until one of the most experienced joined in and asked me a few questions and then told the others "just because you ain't seen it before doesn't mean it can't happen - he got it right." Might as well have been wearing platform soles on my boots for the rest of the day.
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  17. #15
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    start and run windings are reversed. Try swapping the wires @ the run capacitor.

  18. #16
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    I did replace the motor, just not really understanding how it happens, it couldn't of been running backwards for that long, pressures were not alarming. It was making cold air, and I believe subcooling was ~10°. Everything in the machine was original, wiring matched diagram, and looked original, just the strangest thing I've found in a long while.
    There are two ways to do things, Right and Again.

  19. #17
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    I have run into the same thing on Carrier RTU, it had been in service for 6 years with two of the three condenser fans going the correct way. Pulled the rotor and flipped.

  20. #18
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    See how hot the motor has been? The brown edges stickers? The fan motor's run capacitor is bad - shorted - and has to be replaced.

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    Quote Originally Posted by shavedneon View Post
    https://youtu.be/B26K5kDXuzw

    The company I work for has been here over 10 times, no one noticed? This is my first AC service here, I called York to verify the didn't have any condensers that sucked air in the top and blew through the coil, I've never seen one before, but had to check. The motor looked original, and had the original molex plug and matched the manufactures sticker, couldn't verify if it was the original or not, pretty sure it is. Homeowner has lived here 11 years, she doesn't think anyone did anything to it, it's only 15 years old, I'm thinking someone changed the fan blade at some point and didn't get it right. Anyone else ever seen this? What do you think happened?Name:  ImageUploadedByTapatalk1429328511.597556.jpg
Views: 23127
Size:  72.6 KBName:  ImageUploadedByTapatalk1429328521.034093.jpg
Views: 22390
Size:  112.8 KBName:  ImageUploadedByTapatalk1429328530.888281.jpg
Views: 22508
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    PHM
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  21. #19
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    In the days before reversible PSC motors I thought I had invented that way out of a jam. <g> What you are actually doing is reversing the stator. The rotor and the end bells remain the same.

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    Quote Originally Posted by Hrdworkingacguy View Post
    Give that man a cigar...

    Wonder how many people on here have run to a parts house or opened a parts house having a motor on their truck that's right except for direction and didn't realize this...It happened quite often at my last company I worked for...
    PHM
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    Socialism is a zombie. It never dies - even though it is constantly decaying and decomposing.

  22. #20
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    So long as the new motor job included a new run capacitor - that will be an effective way to 'repair it'. But the motor was not the core problem - it was the new run capacitor which actually did the trick. <g>

    PHM
    --------


    Quote Originally Posted by shavedneon View Post
    I did replace the motor, just not really understanding how it happens, it couldn't of been running backwards for that long, pressures were not alarming. It was making cold air, and I believe subcooling was ~10°. Everything in the machine was original, wiring matched diagram, and looked original, just the strangest thing I've found in a long while.
    PHM
    --------
    Socialism is a zombie. It never dies - even though it is constantly decaying and decomposing.

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