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  1. #27
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    Sep 2007
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    I had that K42 relay go bad on me also, swapped with a unit next to it and same problem moved there. Mine had a Tr 100 drive in it though.
    UA Local 32

  2. #28
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    Jan 2013
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    South of GA
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    Thread Starter
    Quote Originally Posted by buford View Post
    I had that K42 relay go bad on me also, swapped with a unit next to it and same problem moved there. Mine had a Tr 100 drive in it though.
    Buford, thank you for taking the time to respond, have you been reading all the comments??, are the symptos we are having similar to the ones you were having when you had the same problem?????

  3. #29
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    May 2014
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    Yo, Wild Cat . . .

    Tried sending you a Trane VFD tech phone number to the email address in your profile, but it got bounced back. If you want to update that profile, I'll try again. Otherwise, sometimes there will be an 800 number right on the drive.
    A skilled Tech would solder a relay on that board and call it good to go.

  4. #30
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    Sep 2007
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    edmonds wa
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    very similar, as Jay said you need to verify on the drive, the enable contact to verify it is closed or calling for the drive to run, If i remember that relay closed 2 wire to the drive to run. Find K42 relay on the small inset wiring diagram that is on the main diagram and see how this relay works. I put a bypass jumper on it and my drive started up. As said the old relay just would not make its contacts at times.It was a pain cause you would reset power and the next 10 tries it would work fine. I waited till the next call and went right to the relay and jumped it out.
    UA Local 32

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  6. #31
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    Jan 2013
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    South of GA
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    Thread Starter
    Quote Originally Posted by BBeerme View Post
    Yo, Wild Cat . . .

    Tried sending you a Trane VFD tech phone number to the email address in your profile, but it got bounced back. If you want to update that profile, I'll try again. Otherwise, sometimes there will be an 800 number right on the drive.
    BBeerme, strange !! Just got an email from one of the guys here, last night I will check it out., thank you.

  7. #32
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    Jan 2013
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    Thread Starter
    Quote Originally Posted by buford View Post
    very similar, as Jay said you need to verify on the drive, the enable contact to verify it is closed or calling for the drive to run, If i remember that relay closed 2 wire to the drive to run. Find K42 relay on the small inset wiring diagram that is on the main diagram and see how this relay works. I put a bypass jumper on it and my drive started up. As said the old relay just would not make its contacts at times.It was a pain cause you would reset power and the next 10 tries it would work fine. I waited till the next call and went right to the relay and jumped it out.
    Buford, thank you taking the time to respond, will look for that relay tomorrow, that relay must be 24 volt , correct?????' Thank you.

  8. #33
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    Sep 2007
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    edmonds wa
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    I am not sure , either pull the relay and look on the diagram. 120v first thing that i remember.
    UA Local 32

  9. #34
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    Nov 2011
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    Just cause you hear click, doesn’t mean diddly.....USE YOUR TOOLS!!

    A drive needs three things to run, 4 if you include power.:

    1: a start enable command (usually a dry contact relay.

    2: all safety and interlock circuits closed.

    3: a Control signal to tell what speed to run at.

    Lacking any one of these three and the drive will not run. You verified the control signal, still have 2 to go.

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  11. #35
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    Jan 2013
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    South of GA
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    Thread Starter
    Quote Originally Posted by 71CHOPS View Post
    Just cause you hear click, doesn’t mean diddly.....USE YOUR TOOLS!!

    A drive needs three things to run, 4 if you include power.:

    1: a start enable command (usually a dry contact relay.

    2: all safety and interlock circuits closed.

    3: a Control signal to tell what speed to run at.

    Lacking any one of these three and the drive will not run. You verified the control signal, still have 2 to go.
    71CHOPS, haha a click won’t tell us anything right??, this morning I’m back at the job and check the K42 relay and it is closing the NO contacts and sending power to the Drive, I had to call the manufacturer square D tech support and after some troubleshooting they diagnosed that the drive is severely damage we are ordering a new one, I want to thank everyone of you that pitched in your 2 cents of wisdom on this issue, God bless you all. I will pist when we replaced it,

  12. #36
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    Nov 2011
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    Cool, thanks for the update!

  13. #37
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    Apr 2006
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    ah, the ol square d to tr200 conversation

  14. #38
    Join Date
    Apr 2008
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    Tucson, AZ
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    I would not like to thank some manufactures for sticking the VFD inside next to the blower so you can stick your head in there while it's running.

  15. #39
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    Nov 2006
    Location
    Southeastern Pa
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    One of the small things that Lennox has done right is to put the MSAV controller in the control section.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist
    Member, IAEI

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