For anyone who actually needs some actual information, I'll make this comment. I know almost nothing but somehow I know more than her. - The fan blade could potentially warp or fly off (but I don't know at exactly what speed or the very specific factors, I came here hoping for any additional knowledge.) - If you are getting the same HP motor then it will have a difficult time keeping up, so if you are considering it you need to at least get up to 2x higher horsepower. - It has literally nothing to do with how AC works, how motors work, anything she wrote down, or capacitors as long as you understand that you obviously still need to make sure it matches the motor as you would if you were going with a lower RPM motor.
I have a motor that has no info on it. I just ordered a 1100 rpm 1/4hp motor because it would come sooner than the other motors. Do I have disaster in my future?
It is important, but you can play with it a little. You can go up a little in the lower HP fractional motors. If you need a 1/5th, you can use a 1/4 with no noticeable issues. If you need a 1/8, you can use a 1/6. As you get to higher HP, you get less wiggle room. I wouldn't use a 3/4 for a 1/2.
Can i use a 1/4 hp 1075 motor to replace a 1/3 hp 825rpm motor? My tech did this and it has been overheating. He doesn't seem to think the motor size is the problem, any suggestions?
The motor RPM and horsepower are both a problem if you're using the original fan blade. If he put you on a 1/4 1075 motor, you would need a smaller/lower pitch fan blade.
Replacing a 15 year old outside condenser motor in Florida. Real problem matching size and specs. Found one advertised as direct replacement BUT original is 850 rpm replacement is 1075 all other specs match. How bad do you think this is going to be? I know I am wrong but it seems like faster would be better.
So sorry I didn't see this before, I didn't realize that my comments were turned off! When replacing a 850 (aka 825 rpm, 810 rpm, 900 rpm all the same thing) What I would do (just for future reference, since I know this is a late response) I would go with a 2 speed motor and only use the low speed in a pinch. The main issue with going with a higher rpm is the fan blades are designed to go 850, so adding speed to that can cause the fan blade or motor to go bad prematurely. Hope this helps and sorry again for the late response!
Thank you for making a 17 minute video where you do not answer the question at all in any meaningful way. It was definitely necessary to spend 17 minutes to say that a higher RPM is a higher RPM, and that you don't know how to actually calculate anything in relation to what fan blade should be used, pretending as if the fan blade cannot be replaced, that it's difficult to replace when you have to pull it out anyway, and then topping it off by saying that somehow a higher performance motor is in some way negatively related to the longevity of your condenser like it would not literally be the opposite of what you said, and of course never elaborating on why it's bad or what actual problems it could cause.
Yes, in fact that is the same RPM. It's a 6 pole motor, which is the same as 1200 rpm which is the same as 1075. It it's over 900 rpm, then it is a 1200 rpm motor. RPM is figured by 7200 divided by the number of poles in the motor - so the options for residential fractional horsepower motors are 4 pole (1600rpm), 6 pole (1200rpm), and 8 pole (900rpm).
