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Thread: RTAA EEVs......

  1. #1
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    RTAA EEVs......

    Apparently the original valve is unavailable according to Trane so their fix is to replace both and replace old eev module with a new module.

    Pretty expensive considering I only need one eev. have to replace cables too.

  2. #2
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    I was just talking to one of my co workers this morning about that. He said the valves have been redesigned and the replacement won't work with the old chiller module that controls the valve.Therefore you have to replace both of them. It sucks, but unless you can find a supply house that still has the old valve in stock, you are out of luck and will have to replace both.

  3. #3
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    Trane seems to have abandonded these machines and I cant blame them.

    They eat sensors and annoy the hell out of people with their high pitched whine.

  4. #4
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    I had see the old ones on ebay for around $500ea.

    are the old ones leaking?

  5. #5
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    They improved the valves, went with more "steps" in the newer valves for tighter control, built in sight glass, and an all around better design.

    This is not new, the change happened around 5yrs ago.

    You will also need to run new cables from the module to the EXV's.

    I have a used aluminum can EXV in my garage, interested?
    UA LU189

    10mm, because it's better than .45acp

  6. #6
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    That bulletin for the EXV and MOD upgrade came out several years ago. The new valves are better anyway. Trane kept on making the 70-125 ton RTAA up until 2 years ago when it was replaced by the CGAM in that tonnage range. The RTAA 130-400 hasn't been around since 2000 or so when the RTAC came out.

    That said, I wouldn't call it abandonment. It's more than likely a case where their supplier simply stopped manufacturing that EXV and Trane was unable to find a replacement valve that would work with their existing control hardware. The RTAAs are great machines and are super-reliable. All screws are noisy, no matter what color they are.
    "There is no greater inequality than the equal treatment of unequals."

    -Thomas Jefferson

  7. #7
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    Rob, I believe Sporlan discontinued making the valves and Danfross makes the new style.
    UA LU189

    10mm, because it's better than .45acp

  8. #8
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    That makes sense. That's exactly what I thought it was. It's happened with a few items on the RTAC where they have substituted other things.
    "There is no greater inequality than the equal treatment of unequals."

    -Thomas Jefferson

  9. #9
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    Quote Originally Posted by zw17 View Post
    They improved the valves, went with more "steps" in the newer valves for tighter control, built in sight glass, and an all around better design.

    This is not new, the change happened around 5yrs ago.

    You will also need to run new cables from the module to the EXV's.

    I have a used aluminum can EXV in my garage, interested?

    I didn't get the memo.

    I hope my customer sees it that way. One valve goes down and I have to try to explain to a building owner why we need two eevs, a module and harness to make the repair.

    So I'll have redundant sight glass's on this chiller ?? ok

    Ive got a RTAA 070 that has the sight glass eev's in it.

  10. #10
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    Quote Originally Posted by commtech77 View Post
    Trane seems to have abandonded these machines and I cant blame them.

    They eat sensors and annoy the hell out of people with their high pitched whine.
    No doubt about the sensors. I am going to replace 3 sets on 2 RTAAs next week. Keep getting low evap refer temp alarms.
    I STARTED WITH NOTHING, AND I STILL HAVE MOST OF IT!

  11. #11
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    low evap temps

    Check your chilled water supply.

  12. #12
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    Pretty easy to confirm flow and gpm.

    Truth is they do eat sensors and Tranes decision to NOT use thermal wells was bone headed to say the least.

  13. #13
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    Look at the bright side, if they have any other RTAA's, they'll have a spare used old style valve and module so they don't have to replace all of them again.

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