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Old 09-15-2009, 06:03 PM   #46
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lennox vs trane vs carrier


You win the prize.
ECM will maintain a constant speed/velocity/flow and if the venting is poor or plugging up with snow it can compensate for that and not have as many nuisance pressure switch problems. Lennox uses that with the new G71 and ADDS a self calibration routine to the logic board. Sweet.

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Old 09-16-2009, 01:28 AM   #47
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thanks for your replies. the furnace is carrier model 58mvp080. electric motor.com has a similar sounding motor except replacement is 16 w hp rated, 1850 rpm and has a corded plug (by photo) while original is marked 1/20 hp, 4000 rpm, and has female socket. oh yeah $108.25. photo sure looks the same. any opinions?
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Old 09-16-2009, 05:13 AM   #48
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They are not the same.
And you can't use a 1850RPM to do the job of a 4000RPM.
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Old 09-16-2009, 03:06 PM   #49
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thanks for your replies. the furnace is carrier model 58mvp080. electric motor.com has a similar sounding motor except replacement is 16 w hp rated, 1850 rpm and has a corded plug (by photo) while original is marked 1/20 hp, 4000 rpm, and has female socket. oh yeah $108.25. photo sure looks the same. any opinions?
Can you post a photo of the nameplate of the orig. motor?
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Old 09-16-2009, 07:15 PM   #50
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That is a variable speed electronically commutated motor (ECM) and is a DC motor. Have to get the whole inducer from Carrier. Put anything else in and you will damage the circuit board. Motor cannot be bought or replaced separately as the impeller is specially clipped/heat pressed onto the motor shaft. I have replaced dozens of those units.

Last edited by yuri; 09-16-2009 at 07:49 PM.
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Old 09-16-2009, 08:23 PM   #51
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I have replaced dozens of those units.
And Carrier smiles every time one is replaced.
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Old 09-16-2009, 08:55 PM   #52
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If it was such a great idea I wonder why everyone else stayed with the standard PSC type? (Trane had a few of them also or some ridiculously expensive type on some mids I believe). All the ones I replaced were under a 10 yr warranty, I see the cost on the invoice though. Replacing those ventors is a HUGE pain in the butt. Not a easy DIY project if you have never done one or understand what can go wrong if they are not done right.

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Old 09-16-2009, 09:27 PM   #53
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I don't know why they thought it was a good idea either.
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Old 09-16-2009, 09:47 PM   #54
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I did some research and they have had it for a long time/ in 5 generations of units starting with a 121 series. I was wondering why the whole unit needed to be so wickedly complicated. A good reason to upsell their products by marketing it as high end and exotic with a longer warranty I guess. The list of codes and troubleshooting info for that unit is huge. Along with the dual boards in Yoyzies unit, Carrier likes to go with the extremely complicated design technology for a SMALL improvement in function IMO.

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Old 09-16-2009, 10:06 PM   #55
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Carrier likes to go with the extremely complicated design technology for a SMALL improvement in function IMO.
You wouldn't be able to post a schematic of that board, would you?
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Old 09-17-2009, 01:56 AM   #56
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i tried the photo but i have issues getting it to this little box. it says:

ge motors & industrial systems ECM
ruzpru 5sme44jg1005
class B cust pn: mc23ce115
115 v 60hz 1a 4000rpm 1/20 hp
ccw 06-27-96 1lq - usa

it is out of balance. if i spin the fan it turns off center and returns to the same point.

any source or replacement would be helpful. thanks

Last edited by biggerjim; 09-17-2009 at 01:59 AM. Reason: odd failed photo info removed
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Old 09-17-2009, 04:50 AM   #57
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Probably has something to do with a Controls company owning them.
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Old 09-17-2009, 10:03 AM   #58
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just a thought from my real work, could i rebalance the fan? a little dab of super glue to the side opposite the heavy spot?
anyone need camshaft selection let me know.
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Old 09-17-2009, 12:07 PM   #59
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could i rebalance the fan? a little dab of super glue to the side opposite the heavy spot?
For dynamic balance you need a strobe light synchronized to the wobble.
General Radio used to make one of these lights.
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Old 09-17-2009, 02:52 PM   #60
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just a thought from my real work, could i rebalance the fan? a little dab of super glue to the side opposite the heavy spot?
anyone need camshaft selection let me know.
Not really.

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