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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
    68,923
    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
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,743
    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.
    Contractor locator map

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

  5. #5
    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

  6. #6
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,743
    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.
    Contractor locator map

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  7. #7
    Join Date
    Jun 2008
    Posts
    45
    Thanks Beenthere,

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

  8. #8
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,923
    Quote Originally Posted by carlb23 View Post
    Thanks Beenthere,

    I will contact the manufacture and see if they can clear things up.
    Oh!!! This should be good

    Let's see now, a DIYer who hasn't even properly adjusted the charge on a system is now going to attempt adding txv's with the guidance of Goodman's tech support. What was that Queen song about dust?
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


  9. #9
    Join Date
    Jun 2008
    Posts
    45
    Quote Originally Posted by RoBoTeq View Post
    Oh!!! This should be good

    Let's see now, a DIYer who hasn't even properly adjusted the charge on a system is now going to attempt adding txv's with the guidance of Goodman's tech support. What was that Queen song about dust?

    Robowanabeetech,

    You can take you pompous attitude and stick it up your A**. While I am not a licensed HVAC "tech" I do design large scale photovoltaic arrays for business and commercial use to help reduce the green house gases that so called HVAC tech's have vented into the atmosphere over the years.

    When someone comes to me asking questions about maybe putting PV's on their house to help reduce their dependence on electricity made from fossil fuel or to just help reduce their energy consumption I don't give them attitude and think I am better than them I give them answers based on my years of experience in the field that I was trained in.

    I am not so insecure that I feel I have to give smart A** answers to people who ask questions.

    Ban me if you like because I will never visit this forum again.

    Carl

  10. #10
    Join Date
    Sep 2005
    Location
    Bay Area, CA
    Posts
    843
    Yeah you tell him!!! Btw I was thinking of putting in a pv system for my house, can you give me the run down what equipment will I need to use and what kind of challenges I will face putting it in, also can I get what forum you post on for pv systems so in the future when its not working I can get technical support from you.

    It shouldn't be to hard to put it in, I'm just a hvac tech but a/cs have been using electricity to run for a long time now. So naturally I should be able to install this.
    Global Warming or: None like it hot
    No pleasure, no rapture, no exquisite sin greater... than central air. -Dogma

  11. #11
    Join Date
    Jun 2008
    Posts
    45
    Quote Originally Posted by green jumper View Post
    Yeah you tell him!!! Btw I was thinking of putting in a pv system for my house, can you give me the run down what equipment will I need to use and what kind of challenges I will face putting it in, also can I get what forum you post on for pv systems so in the future when its not working I can get technical support from you.

    It shouldn't be to hard to put it in, I'm just a hvac tech but a/cs have been using electricity to run for a long time now. So naturally I should be able to install this.
    I have no doubt that you can install a solar PV array, the trick like with HVAC is matching the components for maximum efficiency and getting the sun angles and inclination correct for your latitude.

    Here a few sights that i frequent and while the SMA sight deals with their equipment you can still get answers to general questions.

    http://forums.sma-america.com/

    http://forums.altenergystore.com/

    http://www.wind-sun.com/ForumVB/index.php

    I prefer the Sharp solar panels with their SRS racking system it makes it quicker then most to install and gives a more seamless appearance.

    I have also speced BP panels using the Uni-Rac sunframe system and while more expensive than the sharp SRS racking the sunframe is the most attractive of all the mounting systems.

    The sunframe system is the most difficult to install because you must have you entire array square to within 1/4 inch over a very large area (sometimes 200' X 200')

    I like the SMA inverters they last forever and can take a real beating The Froinus are also very popular and both have a better than 94% efficiency rating. All of the systems that I design are Grid Tied (battery less) systems where net metering laws allow the electric meter to run backwards when the array is generating more energy then the building is using.

    Depending which state you live in there maybe financial incentives as well as the ability to sell SREC's to help offset the cost of a system. A typical 10kwh array will cost between 70 and 80K installed. In some states the rebates can be as high as 70% of the installed cost and the Feds will kick in 2K for any system installed in 2008.

    Good luck with your venture

    Carl.

  12. #12
    Join Date
    Mar 2005
    Location
    Suppy NC
    Posts
    4,513
    Quote Originally Posted by carlb23 View Post
    Robowanabeetech,

    You can take you pompous attitude and stick it up your A**. While I am not a licensed HVAC "tech" I do design large scale photovoltaic arrays for business and commercial use to help reduce the green house gases that so called HVAC tech's have vented into the atmosphere over the years.

    When someone comes to me asking questions about maybe putting PV's on their house to help reduce their dependence on electricity made from fossil fuel or to just help reduce their energy consumption I don't give them attitude and think I am better than them I give them answers based on my years of experience in the field that I was trained in.

    I am not so insecure that I feel I have to give smart A** answers to people who ask questions.

    Ban me if you like because I will never visit this forum again.

    Carl
    with the correct infomation and readings and temps you got dissed the one so called wantabe tech that could have helped you. Not to smart IMO

    Now i stongly recomend you not redesign the unit and use the parts recomended for it. I also recomend you have it set up properly and you will find it will work well as designed.

    it is also very easy to blame hvac techs for green house now that all the real and biddest colprits have been removed. R-22 although has chlorine isnt the bad guy here and niether are the techs. Do your homework before casting stones

  13. #13
    Join Date
    Jul 2006
    Location
    NW burbs of Detroit
    Posts
    6,058
    Another pseudo-scientist with callouses on his inner arms.

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