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  1. #1
    Join Date
    Jun 2005
    Location
    SW Wisconsin
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    5,685
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    Year mfg, Model Number HS9-651-2p; SN: 51

    E-mail question to me:
    Can you estimate the age of my Lennox compressor/condenser unit? The model number is HS9-651-2P; and it has a serial number of #51?

    I never handled Lennox equipment & am not sure anymore about their ID code.

  2. #2
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    35,956
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    51 means it was made in the late Columbus OH plant, need the next 2 numbers for the year made. As I recall, the HS9 was with us from 1976 to 1981.

  3. #3
    Join Date
    Jan 2002
    Location
    Ft.Worth,Tx
    Posts
    4,772
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    Lennox ~~Old Time Rock*

    That is an Oldie HS9 651-2p= 60,000 / 5.0 ton condenser
    Need more numbers 5177D/ would be 1977
    'Life begins with the journey each day'

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