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  1. #1
    Join Date
    Jun 2008
    Posts
    45

    Adding TXV to goodman heatpump

    I hope this doesn't sound stupid but I am new to HVAC.

    I have a goodman cplt 42 3.5 ton 13 SEER heat pump. I want to take out the fixed orifices and replace them with TXV valves. While installing the TXV on the indoor unit is not a problem, I am having difficulty finding a good place to put he bypass on the outdoor unit. I do not see any schrader valve to hook the bypass to and there is not a lot of room in the tubing to install the supplied stub with the port.

    Can I install the equalizer tube after the service port on the condenser unit in to low pressure line since it would be quite easy to cut in there?


    Thanks in Advance,

    Carl
    Last edited by carlb23; 06-22-2008 at 07:18 AM.

  2. #2
    Where did you get the heat pump from?

  3. #3
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,962
    Just how new are you to HVAC? A txv can be installed in any unit.
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


  4. #4
    Join Date
    Jun 2008
    Posts
    45
    Quote Originally Posted by RoBoTeq View Post
    Just how new are you to HVAC? A txv can be installed in any unit.

    Well I purchased the unit about 1.5 years ago and installed it myself. I followed the instructions correctly and the system is supposed charged for a 15' line set which is what i used minus about 2 inches. While the system does run ok I feel I would get better performance if i replaced the orifice on both the indoor and outdoor units with txv valves.

    Carl

  5. #5
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,320
    Quote Originally Posted by carlb23 View Post
    Well I purchased the unit about 1.5 years ago and installed it myself. I followed the instructions correctly and the system is supposed charged for a 15' line set which is what i used minus about 2 inches. While the system does run ok I feel I would get better performance if i replaced the orifice on both the indoor and outdoor units with txv valves.

    Carl
    Just because it says it had the proper amount of charge, doesn't mean it really did.

    And if you don't know what SH the OD TXV is suppose to run at, you won't get as much heat as you did with the piston.
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  6. #6
    Join Date
    Jun 2008
    Posts
    45
    Thanks Beenthere,

    I will contact the manufacture and see if they can clear things up.

  7. #7
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,320
    Quote Originally Posted by carlb23 View Post
    Can I install the bypass valve after the service port on the condenser unit in to low pressure line since it would be quite easy to cut in there?
    Thanks in Advance,

    Carl
    Guessing you mean teh external equalizer.

    No, it won't work if you install it there.

    You didn't just order/pick up TXVs from the supply house did you.

    I can't say for sure on Goodman anymore, but most manufacturers run a much lower SH on the OD coil then they do on the indoor coil. So if you picked up a non adjustable TXV, you actually decreased the amount of heat you'll get.
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