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  1. #1
    Join Date
    Jul 2010
    Location
    NJ
    Posts
    76

    TXV all the time?

    Whenever I put in a 410-a system, I use a TXV. I use 14 seer Goodman equipment as my standard. Every once and a while people ask to shave a couple bucks so I tell them I can drop it to 13 seer. My rep says I can just use the piston, but prefer the TXV for the ease of knowing to do the superheat and sub cooling to what it is. My question is, is this ok and is there any positive/negative to this practice. Any input would be nice, thanks.

  2. #2
    Join Date
    May 2009
    Location
    Cummins, GA
    Posts
    1,564

    TXV all the time?

    You can use a fixed orfice (piston) on R410A systems. Perfectly fine. Just make sure to use the correct size.

  3. #3
    Join Date
    Mar 2007
    Posts
    3,140
    Quote Originally Posted by Brent Ridley View Post
    You can use a fixed orfice (piston) on R410A systems. Perfectly fine. Just make sure to use the correct size.
    But why would you want to? IMO, a TXV is preferable 100% of the time.
    The key to happiness is lower expectations.

  4. #4
    Join Date
    Apr 2001
    Location
    Over Here
    Posts
    1,105
    Get on the goodman website, look up the outdoor unit you are offering, click on the specifications which will bring up the PDF and scroll down to the ahri ratings portion.

    You'll see many 14 SEER matches that use either txv or piston. It's important that your match is the SEER rating you are offering. There will be a different ahri number for similar equipment with differing metering devices.

    I myself prefer a txv, and some utility companies offering rebate $ may require a txv to qualify for their incentive even if the SEER rating is the same with a fixed restrictor.

  5. #5
    Join Date
    May 2009
    Location
    Cummins, GA
    Posts
    1,564

    TXV all the time?

    Some people are not fans of TXV's. A expansion valve can mechanically fail.

    An orfice can't mechanically fail.
    but it can clog.

  6. #6
    Join Date
    Jun 2009
    Location
    Upstate SC
    Posts
    1,439
    Quote Originally Posted by Brent Ridley View Post
    You can use a fixed orfice (piston) on R410A systems. Perfectly fine. Just make sure to use the correct size.
    X2 i did it for several systems because of parker txv issues.

    Sent from my SCH-I510 using Tapatalk 2

  7. #7
    Join Date
    Feb 2013
    Location
    PA
    Posts
    32
    I also prefer a TXV, but the piston is ok too. With the piston the correct charge becomes critical.

  8. #8
    Join Date
    Feb 2013
    Location
    Florida
    Posts
    69
    Less things to go wrong with fixed, but as stated above is more charge critical

  9. #9
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,915
    I prefer TXVs, very strongly, I just wish they would go back to making them like they did 10 years ago...
    If more government is the answer, then it's a really stupid question.

  10. #10
    Join Date
    Apr 2001
    Location
    Over Here
    Posts
    1,105
    I prefer txvs as well... The adjustable kind. The Sporlan kind.

    How many adjustable Sporlans do you see as OEM on resi equipment these days?

    I'm thinking long and hard here on that one.

  11. #11
    Join Date
    Jul 2009
    Location
    South Carolina
    Posts
    3,367
    I don't think there is any one simple answer to the OP's question. The TXV usually makes a more efficient system but it also has a higher failure rate than a piston. On some Goodman 15 SEER systems the rating is the same with or without a TXV. As for their 13 SEER's, a TXV in place of a piston doesn't seem to change the ratings either. Most Goodman TXV's are adjustable so there is no guarantee the SH is going to be right unless it is tested & fine tuned anyways. I do just the opposite & use a piston instead of a TXV wherever possible on their 15 SEER systems but it really comes down to preference.
    My guess would be that any Goodman factory tech would say that you could always put a TXV on any of their 410A systems.
    Gary
    -----------
    http://www.oceanhvac.com
    An engineer designs what he would never work on.
    A technician works on what he would never design.

  12. #12
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    6,051
    I use a txv when I can also. It is the superior metering device. Not only by controlling constant superheat but providing faster "warmup " time by non bleed txvs.

    Yes they have problems from time to time but I feel like the majority are from external sources
    overheating during brazing
    liquid restriction.

  13. #13
    Join Date
    Jul 2009
    Location
    South Carolina
    Posts
    3,367
    I've said this before but to reiterate the rhyme:
    "For a more reliable system use a piston, for more efficiency use a TXV"
    Gary
    -----------
    http://www.oceanhvac.com
    An engineer designs what he would never work on.
    A technician works on what he would never design.

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