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  1. #1
    Join Date
    Sep 2007
    Posts
    155

    Old Lennox Heatpump # size question

    Have an old Lennox heatpump to change out and me and the boss whose been in the industry much longer than me but not a Lennox dealer disagree on the size. He says a M/n 10HP48-1p, S/n 5193E32877 is a 5 ton because Lennox used odd numbering back in the day but it sure looks like a 4 ton to me by those numbers. Can a Lennox guy chime in and settle this ? Thanks

  2. #2
    Join Date
    May 2001
    Location
    carthage ms
    Posts
    634
    first to # are the series, (10) next two are the type (hp) heat pump the next two are the btu (48k) the next number is the revision (1) and the last letter is the voltage (p) 208-230 1 ph that unit is a 4 ton
    The 2008 NATE TOP TECH!!!!!

  3. #3
    Join Date
    Jul 2007
    Location
    Virginia
    Posts
    5,719
    Quote Originally Posted by westmorelnd View Post
    Have an old Lennox heatpump to change out and me and the boss whose been in the industry much longer than me but not a Lennox dealer disagree on the size. He says a M/n 10HP48-1p, S/n 5193E32877 is a 5 ton because Lennox used odd numbering back in the day but it sure looks like a 4 ton to me by those numbers. Can a Lennox guy chime in and settle this ? Thanks

    Send me an email (address is in my profile), and I will forward you the Lennox Nomenclature to show your boss.

    It is a four ton unit as hvacman14 said. In the old days the 5 ton was listed as a "65".
    Instead of learning the tricks of the trade, learn the trade.

  4. #4
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,318
    For old Lennox, round down. The 5 ton 65 dawg mentions, round down from 65 to 60,000 BTUs. Or an old 4 ton would be a 51 which rounds down to 48K. So simple.

  5. #5
    Join Date
    Sep 2007
    Posts
    155
    Thanks a bunch guys. great help and knowledge always hanging around here.

  6. #6
    Join Date
    Nov 2008
    Location
    Bristol Va.
    Posts
    539
    old numbers

    21 = 1 1/2 ton
    26 = 2 ton
    31 = 2 1/2 ton
    41 = 3 ton
    46 = 3 1/2 ton
    51 = 4 ton
    65 = 5 ton


    dogboy

  7. #7
    Join Date
    Jun 2007
    Location
    Greenwood Indiana (Indianapolis)
    Posts
    420
    whats the indoor model # ???
    As iron sharpens iron so one man sharpens another Proverbs 27:17 NIV84

  8. #8
    Join Date
    Nov 2008
    Location
    Bristol Va.
    Posts
    539
    Quote Originally Posted by DOGBOY View Post
    old numbers

    21 = 1 1/2 ton
    26 = 2 ton
    31 = 2 1/2 ton
    41 = 3 ton
    46 = 3 1/2 ton
    51 = 4 ton
    65 = 5 ton


    dogboy
    these numbers as in HS19-311-2P or HP18-411-7P the 3rd number like 411 or 413 stands for single or 3 phase.

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