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Old 02-08-2013, 03:50 PM   #1
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Proper condenser fan motor replacement


Hello, I'm having a problem with the condenser fan motor in my heat pump. I've narrowed the problem down to either a bad run capacitor or bad motor. I'm going to replace the capacitor first and hopefully that will fix the problem. But if the new capacitor doesn't fix the problem, I plan to replace the motor.

My heat pump is a 25 y/o Trane with a GE condenser fan motor. I can't find the exact motor replacement, but an online vendor has found me a replacement Fasco motor (model D787) with the same HP, RPM, VAC, etc. However, after looking at the replacement fan motor specs, I see it has an open-air-over enclosure. The old GE motor has a totally-enclosed-air-over enclosure.

I don't know much about these motors, but since the motor is going to be used outside and exposed to rain and snow, it would seem to me that a motor with openings in the enclosure should not be used in that environment.

Am I correct in that assumption, or am I totally off base?

Thanks!
Gary

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Old 02-08-2013, 04:04 PM   #2
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Proper condenser fan motor replacement


Needs to be a TEFC motor.
Have you tryed the WW Granger web site to cross referance your motor.
Need make and model #.
http://www.grainger.com/Grainger/motors/ecatalog/N-bii

What's the motor doing.
Why not check the capistor to see if it's bad before replacing?

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Old 02-08-2013, 04:56 PM   #3
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Proper condenser fan motor replacement


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Originally Posted by joecaption View Post
What's the motor doing.
Why not check the capistor to see if it's bad before replacing?
Thanks for your reply. The motor runs for a while and then begins to slow down and speed up. Eventually it runs slower and slower and then comes to a complete stop. I checked the motor the last time it happened and the motor was very hot.

I don't have a multi-meter that measures capacitance. Is there another way to check if the run capacitor is bad or not?
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Old 02-09-2013, 11:54 AM   #4
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Proper condenser fan motor replacement


Just something to think about, but there has been a few occasions that I found the problem to be in the control card. I had to replace the control card after the new replacement fan didnít operate. Also did you check the contacts, I found one that was barely making contact and getting hot causing a resistance.
Good luck!
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Old 02-09-2013, 12:23 PM   #5
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Proper condenser fan motor replacement


Get us the model, we can cross reference thru Trane's parts system
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Old 02-09-2013, 02:21 PM   #6
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Originally Posted by AirstarFilters View Post
Get us the model, we can cross reference thru Trane's parts system
Here's the part number off the nameplate on the motor - KCP39GGK105S

The Trane heat pump model number is - BWD736A100B0

Thanks very much for your help!
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Old 02-09-2013, 02:40 PM   #7
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Proper condenser fan motor replacement


Local Graingers can cross reference it.
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Old 02-09-2013, 08:18 PM   #8
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Proper condenser fan motor replacement


Your OEM motor is a MOT02642, 1/3 HP, 1625 rpm. Get a local contractor to order one for you, or we can secure if no others can. It's not an open motor.
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Old 02-10-2013, 10:33 AM   #9
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Originally Posted by AirstarFilters View Post
Your OEM motor is a MOT02642, 1/3 HP, 1625 rpm. Get a local contractor to order one for you, or we can secure if no others can. It's not an open motor.
Thanks for the replacement motor information. I have another question you might be able to answer for me. Are there differences between the MOT02642 and the MOT02602 motors? The specs appear to be identical to me.

Thanks again!
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Old 02-10-2013, 10:41 AM   #10
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Proper condenser fan motor replacement


We don't mean to offend...but you're unit is old. 4 other alternates come up: MOT03336 , 4570 , 4572 , and 4889. Specs do look same on 2602 aside from the 4mfd capacitor. Our records show the 2602 to be an older motor found in GE BGTA models, typically 2-1/2 ton
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Old 02-10-2013, 10:53 AM   #11
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Quote:
Originally Posted by AirstarFilters View Post
We don't mean to offend...but you're unit is old. 4 other alternates come up: MOT03336 , 4570 , 4572 , and 4889. Specs do look same on 2602 aside from the 4mfd capacitor. Our records show the 2602 to be an older motor found in GE BGTA models, typically 2-1/2 ton
Don't worry - no offense taken. I know my unit is old. I'm just happy it's lasted this long (25 years+) without needing any major repairs.

I value and appreciate all of your feedback and the useful information you've provided.
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Old 02-10-2013, 10:59 AM   #12
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Proper condenser fan motor replacement


Best of luck in your search - those systems were very well made , compared to the "10-12 year life expectancy" designed around today's equipment. (Quote by United Technology / Carrier Engineers)
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Old 02-12-2013, 10:00 AM   #13
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Proper condenser fan motor replacement


Just an update ... I replaced the run capacitor, but that did not resolve the problem, so it looks like the motor is the culprit.

One concern I have on a replacement motor is the rotation. The motor in my unit rotates CW (shaft up), but I see that some of the vendors who have the MOT02642 motor available, show its rotation as CCW.

Anyone know if those motors are reversible or not? Thanks.

Gary
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Old 02-12-2013, 01:51 PM   #14
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Proper condenser fan motor replacement


CCWLE
Counter Clockwise , Lead End...same as CW Shaft End
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Old 02-12-2013, 03:22 PM   #15
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Quote:
Originally Posted by AirstarFilters View Post
CCWLE
Counter Clockwise , Lead End...same as CW Shaft End
Thank you sir! That's what I suspected, but I wanted to confirm it with an expert.

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