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  1. #1

    Replaced existing 4/86 carrier condenser for a newer 9/05 Trane And indoor temp 75°

    I recently removed my old but still working carrier 04/86 38QL030330CD s/n R6026781 condenser that had no problem cooling the house to 68° On a hot FL day, but it was noisy and most Likely not as efficient.
    I replaced it with a 9/2005 Trane 2TWR3030A1000AA
    s/n 53818HF2F condenser in hopes it would cool the same and do it more efficiently being almost 20 years newer. However it struggles to keep the indoor temp at 75°

    My air handler is a goodman with a 065 piston

    And 88° outdoor temp
    Gauge pressures 200psi /68psi R22
    75° at the register
    60° at the vents
    The house will only cool to 75° and allow the system to cycle off.
    And the humidity seems higher than with the carrier..


    Any ideas or helpful advice would be appreciated.

    My thoughts are to change the piston to a 062

    And my AC experience is with Autos on R12 & R134a refrigerants with TXV or Orfice systems.

    Thanks
    -Sean

  2. #2
    Join Date
    Jun 2013
    Location
    Austin, TX
    Posts
    641
    Put in a TXV.

  3. #3
    Join Date
    Nov 2011
    Location
    Phoenix,AZ
    Posts
    298
    the old carrier probably has a stronger compressor as well

    how old is the goodman air handler?

  4. #4
    Join Date
    May 2014
    Location
    Phoenix, Arizona, United States
    Posts
    2
    Without knowing some specifics like indoor wet bulb temp, superheat, and subcooling, my best guess is you need to add some refrigerant. Mix matched systems usually can be a real challenge to dial in the freon charge.

  5. #5
    Mike: that was my first thought, due to the trane's manual stating a TXV I am just hoping that someone could give me an ideal piston size to step down to, from the 065. ( 063, 062, 059 ?)


    Kevin: that's why I was was thinking a smaller piston size.

    Guru: I tried adding refrigerant to bring up the pressure on the high side, and it only yielded a warmer indoor temp by allowing the low side to rise in pressure also.

    Without much of a pressure split it's not going to cool properly..

    Which leads me to believe the compressor pumps less volume and needs more of a restriction.

  6. #6
    Join Date
    Jun 2013
    Location
    Austin, TX
    Posts
    641
    Just use a generic replacement TXV of the correct tonnage.

  7. #7

  8. #8
    Join Date
    Jun 2013
    Location
    Austin, TX
    Posts
    641
    That will probably work but way overpriced for something on eBay. For around that price, you can easily get one at your local HVAC parts store.

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