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  1. #1

    Hmm changing a 3 ton TXV

    Keeping the TXV wet with rags(cut small and wrapped) nitrogen flowing thru the TXV, unsoldered the old put the new one in. All of the sudden one spot on the back of the TXV didn't take, here is my question. Do you tech say you have to use 45 % or higher silver solder. Manufacturers say 8 % minimum. It was a fiasco trying to solder finally getting it but it looks not not good. Any situations where you just couldn't get it to flow using 20% rod? How were you sucessfull? It appeared not enough heat but A11 Turbo head on 3 ton TXV I would think adequate....what a fisaco after 31 years in this and to be humbled is humbling...

  2. #2
    Join Date
    Mar 2007
    Location
    NW AR
    Posts
    2,478
    Maybe too much pressure on the n2?

  3. #3
    Possible, getting older the hearing is not as good, even put the hose in my ear to ensure I could here my flow small amount just moving the gauge low side

  4. #4
    Join Date
    Mar 2007
    Location
    NW AR
    Posts
    2,478
    I use 15 with no issues. I go hot and fast

  5. #5
    Join Date
    Sep 2007
    Location
    NH
    Posts
    1,213
    Quote Originally Posted by ar_hvac_man View Post
    I use 15 with no issues. I go hot and fast
    Yep.. only need 45 if its a steel or brass valve.

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