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Old 09-13-2011, 11:52 PM   #1
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variable speed trane blower motor


Trane XV-80 blower motor just makes thumping sounds like it wants to start, and bumps a little bit at each thump.
The LEDs on the control box don't indicate a problem (if I'm reading them right)
I've read some posts here that state the motor is a DC motor, but the label on it says 115V. (Maybe it's converted inside the motor?)
It does have the big wiring harness going to it, and it IS a variable speed blower, I know that for sure.
I've read here that the parts for these are VERY expensive, and I don't want to dump a ton of cash into a unit that's 12-13 years old.
Has anyone out there got any experience with these units?
I'd be happy to just jumper it to make it a one speed motor, if that's possible.
I've even looked at replacing the fan with a non computer controlled unit, but I was hoping someone might have some insight for me. thanks, doug

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Old 09-14-2011, 12:30 AM   #2
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variable speed trane blower motor


Check the wire molex with multiple wires plugged into the rear of motor....


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Old 09-14-2011, 09:03 AM   #3
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On the rear of the blower motor is a control module and they can go bad over time. You'll need to get someone to check that out for you.
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Old 09-14-2011, 01:15 PM   #4
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variable speed trane blower motor


thanks for the advice.
I'll check that connector now.

no apparent problems with the 16 pin pigtail harness or the 5 pin connector either.

I'll clean the thing, and take my fluke and check the pigtail for continuity.

the motor does have caps inside, because the label on it says to wait 5 minutes before handling after disconnection due to high voltage. no worries there

it does say it's wired for 115V and that it's a "Programmable" motor

I don't see a module on the outside of the motor, would it be inside?
what kind of tester should I make sure the tech has before calling one out if I'm going to have them test that module?
thanks again
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Old 09-14-2011, 01:56 PM   #5
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variable speed trane blower motor


Check this link. http://www.gotoevo.com/ECM%20products.htm
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Old 09-14-2011, 04:06 PM   #6
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variable speed trane blower motor


thanks for the replies, everyone

the pigtail tests out good

removed the controller and cleaned it

I posted a couple photos of the board and the outside with the Whit-Rodgers info on it at photo bucket at the following location:

http://s1105.photobucket.com/albums/h351/afn63537/

no obvious hot spots on the board, and all the caps are normal.

put everything together and watched LED for trouble codes, and found none

legend says slow flash is "normal with no call for heat"

I turned on the heater, and it blinked fast which is
"normal with call for heat" and the heater started up, but the blower motor still just bumps a back and forth in BOTH directions a few degrees without spinning around

LED indicates everything is normal, but that blower motor just bumps back and forth, even if I let it sit with the fan only on for a couple minutes straight. no difference
Sound familiar to anyone? If I buy the motor, will it come with the module mentioned?
I'll give Johnstone a call tomorrow and find out if the parts are available.
Would a non-Trane tech have the proper tester to test the electronic parts?
thanks to all
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Old 09-14-2011, 04:14 PM   #7
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variable speed trane blower motor


This is the motor with the module on the end or left side of the picture. this is the module.
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Old 09-14-2011, 04:34 PM   #8
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variable speed trane blower motor


that's the beast, alright, but I haven't pulled the motor out yet, so wasn't sure what was inside.

do you think the module is a trane only item, and would it be available without the motor?

thanks alot for the photos and insight

doug
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Old 09-14-2011, 04:50 PM   #9
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the module must be a trane furnace model specific programmed and is available separate from the motor. This is NOT a user servicable item. Other than removing the module and seeing burnt components it must be diagnosed by a professional with a techmate tool ( allows you to test the motor and module and determine cause of error).
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Old 09-14-2011, 05:54 PM   #10
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Read the Bob Reynolds seminar on variable speed motors.
If you get lucky and can use a soldering iron, this is a possible cause of your problem.

Carrier 58MVP Blower Problem

thermistor thermistor thermistor
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Old 09-14-2011, 06:06 PM   #11
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a pic. It's the black disc by the winding, in largest green part of board. Maybe it's not too visible, but it's wrinkled, burned and toasted.
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Old 09-14-2011, 06:26 PM   #12
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Quote:
Originally Posted by diyorpay View Post
a pic. It's the black disc by the winding, in largest green part of board. Maybe it's not too visible, but it's wrinkled, burned and toasted.
This is the thermistor. Thermistors are resistors that change resistance depending on the temperature at the area around the thermistor. The resistance of the thermistor will increase when the temperature at it increases. They can be used to shut down a circuit or system if overheating occurs. As the heat rises the thermistor will sense it, and increase resistance to a level that will allow very little to no voltage and current.
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Last edited by JJboy; 09-14-2011 at 06:30 PM.
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Old 09-14-2011, 07:52 PM   #13
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You guys rock for taking the time to help, so thanks so much

Is the techmate tool a trane specific tester, or would most techs have one?

Can it be used to diagnose the motor / module when uninstalled, or does it need to be hooked up and tested there?

Soldering isn't a problem for me, so if I find a burnt out cap or thermistor, replacing that would be my first choice, assuming I can order the part readily.

I had to pull the core out of the air handler 2 years ago and find and solder a pinhole in the middle of the darn thing, so this is easy compared to that!

Those pics are awesome, thanks so much.

I'm going to go to that Reynolds seminar in a few minutes and check it out, too!
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Old 09-14-2011, 07:56 PM   #14
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variable speed trane blower motor


This website will help you out.

http://www.thedealertoolbox.com/Resi...s/Default.aspx
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Old 09-14-2011, 08:03 PM   #15
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variable speed trane blower motor


Quote:
Originally Posted by afn63537 View Post
You guys rock for taking the time to help, so thanks so much

Is the techmate tool a trane specific tester, or would most techs have one?

Can it be used to diagnose the motor / module when uninstalled, or does it need to be hooked up and tested there?

Soldering isn't a problem for me, so if I find a burnt out cap or thermistor, replacing that would be my first choice, assuming I can order the part readily.

I had to pull the core out of the air handler 2 years ago and find and solder a pinhole in the middle of the darn thing, so this is easy compared to that!

Those pics are awesome, thanks so much.

I'm going to go to that Reynolds seminar in a few minutes and check it out, too!

The motor must be installed to test easily with the techmate. I don't know that all techs would have this tool. In fact I'm not too sure many do. I do, but I'm a tool junkie.

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