Results 1 to 13 of 13
  1. #1
    Join Date
    Apr 2002
    Location
    Lucas, Texas
    Posts
    93
    Lennox Heat Pump 1987 model

    Model # HP18-511V-4P
    Serial # 5187E38429

    Thanks! Jerry

  2. #2
    Join Date
    Sep 2004
    Posts
    21
    3.5 ton

  3. #3
    Join Date
    Apr 2002
    Location
    Lucas, Texas
    Posts
    93
    Thanks HeatpumpMan!

  4. #4
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    The 511 is 4 ton unit. If it was 3.5 ton it would be 461
    If more government is the answer, then it's a really stupid question.

  5. #5
    Join Date
    Jun 2003
    Posts
    68

    Sorry to bring up old post

    Is 311U a 2 ton and 411U a 3 ton? Just curious.....thanks

  6. #6
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    33,886
    Look at the nearest 1/2 ton and round up.

    30,000 round up to 311 for 2.5 ton
    36,000 round up to 411 for 3 ton

    Of course without knowing exact evap match and looking at the ratings, could be a several thousand BTU range on any size.

  7. #7
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,699
    hp18-511 cheap builder grade 4 ton

  8. #8
    Join Date
    Jul 2002
    Location
    Zelienople, Pa
    Posts
    2,965
    Size and efficiency of
    M# HS29-261-2P
    S# 5896H23023

    Thanks!
    How tall are you Private???!!!!

  9. #9
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,699
    10 seer 2 ton

  10. #10
    Join Date
    Mar 2005
    Location
    Houston, Texas
    Posts
    11,847

    Lennox HP

    Try 1-800-453-6669.

  11. #11
    Join Date
    Nov 2001
    Posts
    1,874
    2 Ton -- 261 -- 024

    2 1/2 Ton -- 311 -- 030

    3 Ton -- 411 -- 036

    3 1/2 Ton -- 461 -- 042

    4 Ton -- 511 --048

    5 Ton -- 651 -- 060
    If you try to fail, and succeed.
    Which have you done ?



  12. #12
    Join Date
    Apr 2001
    Location
    west virginia
    Posts
    689
    i was always told the first 2 number equal btu IE 261 is 26,00o btu . 311 31000 and so on its easier to remeber for me anyway

  13. #13
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,699
    toolpusher has them right

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