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  1. #1
    Join Date
    May 2009
    Posts
    264

    What are we going to do about the new ECM motors that are going o?

    Just had another one today. 2 yr old york air handler, bad ECM motor. Is there any adequate drop in solution? This one was a 1/3 hp non programmable. pretty much everyone we install has an ecm, and we guarantee 24 hour repair within 2 yrs of install.

  2. #2
    Join Date
    Jun 2011
    Location
    Hammond,La.
    Posts
    1,176
    These motors or at least the modules seem to be sensitive to 'dirty power'. We are starting to put voltage protection on every install. For a few bucks it's worth a shot since fluctuating power seems to be what is killing them.
    "I am for doing good to the poor, but I differ in opinion of the means. I think the best way of doing good to the poor, is not making them easy in poverty, but leading or driving them out of it."
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  3. #3
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    In addition to the potential power issues, they don't like high static pressures.

    One or the other seems to be the common theme with most ECM motor failures.

    Feed them clean power and reasonable static pressures and they are extremely reliable.
    If more government is the answer, then it's a really stupid question.

  4. #4
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    33,895
    For cooling or an air handler, probably could put a PSC in temporarily. Some furnaces too. Others "talk" to the motor and if it reports an error, the furnace won't fire.

  5. #5
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,717
    Sounds like it was an X13. Might want to carry some in stock.
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  6. #6
    Join Date
    Jun 2003
    Location
    Jacksonville, FL.
    Posts
    4,313
    Interesting....

    Which mfg is it? GE or Emerson? Seems I have more issues w/the GE. I've got two that have gone bad in the last week.
    WHY?

  7. #7
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    I still haven't run across a bad X13 motor.

    I want to crack one open and see if it has the same/similar thermistor that the ECM2.x motors have.
    If more government is the answer, then it's a really stupid question.

  8. #8
    Join Date
    Apr 2012
    Location
    Millsboro, DE
    Posts
    100
    I noted the comment about static pressure.

    It's not uncommon for me to see 0.7" or 0.8" with a furnace. Is that a problem for ECM motors? I know Trane furnace product data goes to 0.9". If the SP's within the range published in the Product Data, should I be concerned? Or should I only be concerned when it's beyond the published range (IE: 1.0" or more for the Trane)?

    Many thanks.

  9. #9
    Join Date
    Dec 2002
    Location
    Arizona
    Posts
    4,308
    Quote Originally Posted by ferd1942 View Post
    I noted the comment about static pressure.

    It's not uncommon for me to see 0.7" or 0.8" with a furnace. Is that a problem for ECM motors? I know Trane furnace product data goes to 0.9". If the SP's within the range published in the Product Data, should I be concerned? Or should I only be concerned when it's beyond the published range (IE: 1.0" or more for the Trane)?

    Many thanks.
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  10. #10
    Join Date
    Apr 2012
    Location
    Millsboro, DE
    Posts
    100
    Thank you so much for posting that! I'd heard from our Carrier distributor about the motors hunting at high SP's, with premature failures occurring. I've downloaded the document for future reference. And it was nice to see GE essentially confirm that a good duct design will save energy every time a system runs.

    I've done some math indicating high SP loses a SEER point or so due to increased blower power: The customer paid for a 16, but received a 15 or less because of the poor ductwork, high SP and increased blower power; when I see that, I call it "Bait and Switch".

  11. #11
    Join Date
    Mar 2005
    Location
    5,000 ft
    Posts
    2,190
    Quote Originally Posted by ferd1942 View Post
    I've done some math indicating high SP loses a SEER point or so due to increased blower power:
    Please share this with us. I would like to see your numbers.

  12. #12
    Join Date
    Apr 2012
    Location
    Millsboro, DE
    Posts
    100
    All furnace nameplates are marked 0.5" ESP. That's an AGA certification, never learned what that's about. I believe it dates back to when people designed duct systems at 0.5", to include the coil: 0.5" furnace less 0.25" for the coil left 0.25" for ducts, duct fittings, registers, grilles and exotic air cleaners. Today, it's quite common for national builders and others to select coils at 0.4", so the 0.5" marking must be ignored.

    That 0.5" marking is not to be confused with the manufacturer's product data. York, for instance, permits its TM9V furnaces to be operated at 1.0".

  13. #13
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,717
    When it gets close. Remember when you put that new furnace in with a new air filter. it will only be a few weeks before the filter starts to load up and increase static pressure. So if the furnace list .9", and your starting with a .8". It won't be long before your over the rating.
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