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  1. #1
    Join Date
    Sep 2002
    Posts
    12,195

    Can I make a TXV distributor ?

    1.5 HP, R-404, reach-in freezer. Changing out twin cap tubes for a one ton R-404 TXV.

    Brazed in 5" by 1/4" OD copper where the cap tubes had been. Brought them together and brazed them into the end of a piece of 1/2" copper - to mate up with the TXV.

    Then I realized that I could keep the TXV neatly inside the evap enclosure if I mounted it about ten-twelve inches further forward. So I left the 1/2" copper that long - rather than cut it down to 3" or so as I had originally planned.

    My actual question is:

    If I have the TXV outlet feeding a foot of 1/2" copper, Then two short 1/4" stubs, Then into the evap - will that create a problem?

    My natural tendency would have been to make the 1/2" section as short as possible - a few inches. But to do that I have to mount the TXV outside the original enclosure. Which would look ugly. <g>

    I hate to re-do the evap inlet - it was a huge bastard - no space - couldn't see - brazing by feel - no space to work - etc.

    So? Will the 12" of 1/2" copper before my home-made 1/4" 'distributor' tubes make any difference?
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  2. #2
    Join Date
    Jul 2008
    Location
    Denver, CO
    Posts
    4,229
    Man I would say that would work just fine as long as your bulbs are located in the same location as the old bulbs. This is just my opnion I would like to hear what the rest of the guys have to say about this, but I think it would work.

  3. #3
    Join Date
    Jul 2004
    Location
    NJ
    Posts
    1,793
    why are you intalling a 1 ton txv?

  4. #4
    Join Date
    Jun 2008
    Location
    South Carolina
    Posts
    36
    I've done almost the exact same thing before and it worked fine. Just keep both your 1/4" lines close to the same length as well. I also changed two cap tubes over to a TXV on a R-13 cascade freezer and to my amazement, it work great. Don't forget to pull a good vacuum and install a new filter drier.

  5. #5
    Join Date
    Jun 2007
    Location
    Williamsport, PA
    Posts
    165
    My understanding of a distributor is that it is designed to mix the refrigerant ater it leaves the TXV. I does this by "sraying" it through
    a nozzle much like a hose end does at the end of a garden hose. This spreads it out evenly into the distributor tubes after the nozzle.I would be
    afraid that the device that you mad would not feed each tube evenly. With out the nozzle I think the liquid would fall to the lowest tube with the vabor going to the highest tube. If it would do this the TXV could not modulate properly. Just my opinion.

  6. #6
    Join Date
    Sep 2002
    Posts
    12,195

    Wannafreeze -

    It matched the compressor BTU's the closest.

    Why do you ask?

    PHM
    -------


    Quote Originally Posted by wannafreeze View Post
    why are you intalling a 1 ton txv?
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  7. #7
    Join Date
    Sep 2002
    Posts
    12,195

    Tiger 93 -

    What bulbs?

    PHM
    ---------


    Quote Originally Posted by Tiger93rsl View Post
    Man I would say that would work just fine as long as your bulbs are located in the same location as the old bulbs. This is just my opnion I would like to hear what the rest of the guys have to say about this, but I think it would work.
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  8. #8
    Join Date
    Jun 2008
    Location
    South Carolina
    Posts
    36
    Poodle Head, I think your one ton TXV will be a good match. Have you tried using a balanced port TXV, I've been using them a lot and like the way they control SH.

  9. #9
    Quote Originally Posted by Poodle Head Mikey View Post
    1.5 HP, R-404, reach-in freezer. Changing out twin cap tubes for a one ton R-404 TXV.

    Brazed in 5" by 1/4" OD copper where the cap tubes had been. Brought them together and brazed them into the end of a piece of 1/2" copper - to mate up with the TXV.

    Then I realized that I could keep the TXV neatly inside the evap enclosure if I mounted it about ten-twelve inches further forward. So I left the 1/2" copper that long - rather than cut it down to 3" or so as I had originally planned.

    My actual question is:

    If I have the TXV outlet feeding a foot of 1/2" copper, Then two short 1/4" stubs, Then into the evap - will that create a problem?

    My natural tendency would have been to make the 1/2" section as short as possible - a few inches. But to do that I have to mount the TXV outside the original enclosure. Which would look ugly. <g>

    I hate to re-do the evap inlet - it was a huge bastard - no space - couldn't see - brazing by feel - no space to work - etc.

    So? Will the 12" of 1/2" copper before my home-made 1/4" 'distributor' tubes make any difference?
    I would lean more towards a piece 4-6 inches long.

    Field engineering is on a case by case basis. No guarantees of outcome and advise the customer to start saving up.

  10. #10
    Join Date
    Dec 2005
    Location
    San Jose, CA
    Posts
    465
    I have used a TXV directly into an water cooled condenser(used as a evaporator) for chilled water with a residential condensing unit for a machine shop chilled water loop. It worked great.

  11. #11
    Join Date
    Jul 2004
    Location
    NJ
    Posts
    1,793
    Quote Originally Posted by Poodle Head Mikey View Post
    It matched the compressor BTU's the closest.

    Why do you ask?

    PHM
    -------
    I wouldn't ask if you had said if it was a cooler.Can you post the mn of compressor?

  12. #12
    Join Date
    Jul 2000
    Location
    Guayaquil EC
    Posts
    10,260
    If that compressor's a 1.5 HP KATB then you need a 1/2 ton valve capacity.

    I've used a Sporlan Q2x4 valve with a QC-2 cartridge and a KT43-SZ element on the True GDM72F. I made up the same 1/2" into two 1/4" for the distributor and it works great. Kept it short and straight though, just outside the evap housing. Nobody sees it because only we ever look up.

  13. #13
    Join Date
    Sep 2005
    Location
    florida
    Posts
    5,501
    like ice said make sure your txv is sized right .other than that I have replaced many cap tube systems with a txv.
    I love the smell of phosgene first thing in the morning:

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