HVAC Blower Not Working


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Old 07-11-14, 02:19 PM
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HVAC Blower Not Working

I have a Trane TUE120A960H1 that is probably about 18 years old. The blower motor first started being really loud when running and had low air flow and after about a week, would not come run at all. There was a buzzing sound and I could prod the hamster wheel by hand to get it started but it was still loud and not spinning well. Based on the history below, I thought it best to replace the motor and cap with a new one. Low and behold, when I put in the new one, it did the exact same thing. It will hum but not start and if I prod it by hand, it will run but slowly and loudly. Sounds exactly like the old one. I can't find anywhere that it might be rubbing the housing and it spins relatively well by hand (although the old one spun easier). I am now at a loss (or I guess I always was). Anyone have any idea what else could cause such and issue?

History: I moved into the house early last year. At one point, not long after moving in, I noticed that the system was really loud and upon investigating found that the motor was loose from the housing and rubbing against it. I put one screw back in but apparently they were all bad. I also had what seemed to be low airflow and the evaporator was freezing up. When the noise soon returned, I replaced the motor mount completely which seemed to be fine through the winter although I still had low airflow and freezing up. A couple of months ago, I noticed that it was loud again but a different loud. It still seemed to be mounted properly with plenty of clearance. That is where I am today.
 
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Old 07-11-14, 06:30 PM
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Welcome to the forums.

You are going to have to trace the motor wiring and check for 120vac where it connects to the board.
 
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Old 07-13-14, 11:23 PM
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Fixed it (at least part of it). When I bought the new motor and cap, the store didn't have the correct size cap so the salesman gave me 2 caps that added up to the total and he wired them together. Unfortunately, he wired them in series which doesn't work. I added another wire to make them parallel and the motor started right up. I think the fan wheel is a little out of balance because it vibrates and is still a little noisy but nothing is touching. Is there a way to balance the wheel or does it need replacing? I can't find anything on it that looks off but it does seem to have some balancing weight on it on a couple of blades.
 
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Old 07-13-14, 11:42 PM
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Rebalancing a blower wheel is a hit or miss thing. Not always an easy project.
 
 

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