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  1. #1
    Join Date
    Oct 2019
    Posts
    2
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    Confused Trane Serial Number help needed please

    Hi,

    Can anyone please help me with the age of these units? 1996?

    TRANE TTA090A300CB L171R1NAH
    TRANE TWE090A100B L213LUR5H
    TRANE TTA090A300CB L17348NAH
    TRANE TWE090A100B L2521EG5H
    TRANE TTA090A300CB L2360B9AH
    TRANE TWE090A100B L215PD75H


    TIA!

  2. #2
    Join Date
    Feb 2010
    Location
    Metro Atlanta, GA
    Posts
    555
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    1996

  3. #3
    Join Date
    May 2014
    Location
    Bay Area California
    Posts
    24,554
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    For residential and light commercial, the L would indicate 1996.
    If you were a real tech, you'd solder a relay on that board and call it good to go.

    I do a triple evac with nitro to remove non condensables.

    I use 56% silver on everything except steel.

    Did you really need the " If you were a real tech " ??

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