Blower fan motor replacement


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Old 09-07-14, 01:58 PM
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Blower fan motor replacement

Our blower fan motor quit 2 days ago. No AC was coming out vents & heard the unit just "humming", no fan rotation. Had it checked & told fan motor was gone. We have a Evcon with an A.O Smith 1/3 HP 1075 rpm 115V original in it (new put in 2009). The new motor put in is now a 1/4 HP 1075 rpm 115V Zhongshan motor. We're thinking we may need to just buy & replace this new one ourselves with a OEM. New motor also doesn't have rubber mounts like old one & now it shakes & vibrates when it running. Should we just go back to an orig. stock motor? Worried the 1/4 HP won't hold up like a 1/3 HP.
 
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Old 09-07-14, 02:10 PM
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To better assist you please post the make/model number of your indoor unit.
 
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Old 09-07-14, 02:20 PM
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Thanks. The unit was put in new 9/2009, is an Evcon DGAA070BDTB.
 
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Old 09-07-14, 02:31 PM
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Welcome to the forums.

The unit was installed in 2009. Since then you had the 1/3hp motor replaced with a 1/4hp motor. Not only will a 1/4hp not hold up as well.... it sounds like an airflow problem exists causing the motors to run hot.

PART #: 02435603000 - BLOWER MOTOR 1/3 1075/2 CCW 115-1-60

Part 19 is the motor and 20 is the mount
COLEMAN Furnace Cabinet Parts | Model DGAA070BDTA | SearsPartsDirect
 
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Old 09-07-14, 02:37 PM
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Here is a link to a manual for your unit that includes a parts list: http://www.allreds.net/WS2/docs/col/dgaa_manual.pdf

On page 10, item 19, it lists two different motors; old and new. In both cases, they are 1.3 HP motors. It also shows information about mounting the motor at note 2.

"For Serial Numbers lower then 001207164- Replacement DGAA motors also require Motor Mount
Assembly 373-19806-100 if replaced motor has integral, flex-arm motor mount".

So it appears you will need to compare your serial number to see if it is lower or higher than 001207164 to see which motor mounting option it needs.

The part number 02435603000 cross-references to A.O. Smith F42F52A50.

It is always best to replace any component with OEM parts as they are best suited to fit properly and operate the system as designed by the engineers.
 

Last edited by firedawgsatx; 09-07-14 at 03:17 PM.
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Old 09-07-14, 03:53 PM
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Thanks for all the info... thinking I have a headache now. Actually, I'm wondering if our only problem to begin was a bad capacitor but the repair tech who came out said it was the motor. We did pull the blower unit out ourselves after he went to get the parts, just to ck it, and the fan with motor on, spun real easy. We were told he would replace with OEM part. After he left we found it was not OEM motor, & less HP, plus he took our orig. motor with the mount on it. We're trying to get that back & will try getting the parts you recommended & re-do the whole thing (writing off the $460 he charged). We're also worried about the blower box as he "hammered" in his new rigid mounts on the fan box & we're afraid maybe that's why it sounds off balance when spinning and you can feel the front panel vibrating. Hopefully, we can get this all fixed ourselves with the parts you listed.
 
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Old 09-07-14, 04:32 PM
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Sorry to hear about your experience with the tech who you dealt with. Being able to spin a motor does not tell you if it is good or bad. Obviously, if the shaft is seized that is a good indicator you are looking at a replacement. If the company informed you that a new oem replacement motor would be installed and it was not I would lodge a formal complaint to the owner of the hvac company. There are many tests that a competent hvac tech can perform in the field to determine the condition of the motor. If he damaged your furnace while trying to make the replacement fit that is yet another grievance you have to address with the company owner. I suggest you advise the owner about everything you have stated in this thread and then give him a chance to make it right with you. Once he has the facts he will be able to make an informed decision to either make things right or not do the correct thing. If he decides not to do the right thing I would file a formal complaint against him with the Better Business Bureau. It has been my experience that the overall majority of business owners want to do the right thing as repeat customers are difficult to come by and is what keeps them in business. Most business is generated by word of mouth and through recommendations of family, friends and co-workers.

If you decide to go with the parts in the manual and conformed by PJmax it definitely pays to shop around. Doing a quick internet search, I noticed that using F42F52A50 resulted in more hits and at usually much lower prices.
 
 

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