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  1. #1
    Join Date
    Apr 2006
    Location
    Chicagoland
    Posts
    690
    I can`t get into the PRO`s forum so I may have a dumb question.
    In the past oversizing evaporator by half a ton was acceptable.(with orfice)
    What about TXV? This is the first year I have had any experience with them. Can go more than 1/2 with TXV?

  2. #2
    Join Date
    Jun 2004
    Location
    Howell, Michigan
    Posts
    16,168
    The best way to do it is to go HERE and properly match your equipment.

  3. #3
    Join Date
    Nov 2004
    Location
    Naples, Fla.
    Posts
    1,403
    Oversizing evap coils & mix matching TXV to orifice is no more accurate than using 400-500 sq ft p/ ton. Both will yield very bad results.

    Stick with ARI rated match coils.

  4. #4
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,923
    If you are a pro, which your profile shows nothing about, then you can apply for pro status.

    As for "oversizing" anything; why would anyone want to do something like that?

    If you are referring to installing an ARI matched coil that has a larger capacity nomenclature indication then the outdoor unit, there is no problem as long as you install the proper metering and charge according to the manufacturer's specs.

    With a larger indoor coil, you may experience less dehumidification unless you slow down the blower speed. Better know what you are doing or you may wind up with an ice monster and no cooling.
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


  5. #5
    Join Date
    Apr 2006
    Location
    Chicagoland
    Posts
    690
    Why would a larger coil with more surface area dehumidify less?
    My original question reffered to matched equipment I.E. :
    AMST 2.5 ton cased coil and 3.0 ton coil are one of the same.
    Same coil handles either unit. Just trying to understand..

    btw, getting into the Pro forum is impossible, everytime I hit the button I get promted for name and password then it tells me I`m already a member and to apply for membership, apply for membership, tells me I`m already a member.. I can do that for hours won`t help


    [Edited by Praha99 on 10-08-2006 at 02:09 AM]

  6. #6
    Join Date
    Nov 2004
    Posts
    2,927
    do a search here on

    'apply for membership-PRO`s forum"

    this question has been asked several times. There might even be an official thread or forum about it.

    I think you need to send an e mail to somewhere or somethin.

    good luck

  7. #7
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,923
    Originally posted by praha99
    btw, getting into the Pro forum is impossible, everytime I hit the button I get promted for name and password then it tells me I`m already a member and to apply for membership, apply for membership, tells me I`m already a member.. I can do that for hours won`t help


    [Edited by Praha99 on 10-08-2006 at 02:09 AM]
    Send an email to htalk.committee@gmail.com along with your real name, username, email address that is listed in your H-Talk file and some verifiable evidence of your HVAC status.
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


  8. #8
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,923
    Originally posted by praha99
    Why would a larger coil with more surface area dehumidify less?
    My original question reffered to matched equipment I.E. :
    AMST 2.5 ton cased coil and 3.0 ton coil are one of the same.
    Same coil handles either unit. Just trying to understand..


    [Edited by Praha99 on 10-08-2006 at 02:09 AM]
    The larger the coil surface area, the higher the coil temperature per square inch. The higher the coil temperature, the less time the coil will hit the dewpoint of the air moving across it. By lowering the speed of the air, less load is put on the coil allowing the surface area to decrease in temperature. Also, the lower the blower speed, more air will make contact with the coil surface for removing moisture from that air.
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


  9. #9
    Join Date
    Apr 2006
    Location
    Chicagoland
    Posts
    690

    Thumbs up



    I learned something new today, thanx ROBO

  10. #10
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,721
    Originally posted by praha99


    I learned something new today, thanx ROBO

    I think you have to use the contact us at the bottom to apply for pro membership for now.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

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