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  1. #1
    Join Date
    Jan 2004
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    Mt. Washington, KY
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    28
    have a copeland scroll on a walk in freezer, that utilizes liquid injection. Compressor failed and I had to replace. The old model compressor had a liquid injection line solinoid valve with a capillary canister. The new compressor utilizes a DTC liquid injection valve. Question is this: Should the liquid injection line solinoid valve been removed or should it have stayed in place? Does the DTC regulate refrigerant and prevent refrigerant migration?

  2. #2
    Join Date
    Jan 2004
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    That injection system is controled thermostatically, kind of like a TXV. I believe if the compressor is not hot, it does not feed. Solenoid is not necesary.
    A Diamond is just a piece of coal, that made good under pressure!

  3. #3
    Join Date
    Jul 2001
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    Gold Coast of Connecticut
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    4,570
    I would leave it in place, i think they are still needed

  4. #4
    Join Date
    Feb 2004
    Location
    Medford Oregon
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    807
    the new style compressor has fitting for the DTC valve,
    this fitting is 1/4"od. just put your cap tube into it, leave the old solenoid on. the 1/4"od designed to allow replacing old comp as is.

  5. #5
    It should stay. The solenoid will prevent migration into the compressor during off-cycle.

  6. #6
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    ooops, I did it wrong.
    A Diamond is just a piece of coal, that made good under pressure!

  7. #7
    Join Date
    Jul 2000
    Location
    Guayaquil EC
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    10,265

    Copeland Scroll - Cap tube to DTC valve....

    Here's the Copeland AE Bulletin that discusses this issue:
    http://www.customer-copeland-corp.co...EB/tae1299.pdf
    The LLS isn't required, but it won't hurt to leave it in the circuit.

  8. #8
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    Jan 2004
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    Thanks Ice, I thought I read the instructions correctly.
    A Diamond is just a piece of coal, that made good under pressure!

  9. #9
    Sorry frozen- I was probably a little strong stating a personal opinion on the use of a solenoid with the DTC. I think the DTC is a great improvment over the cap tube for liquid injection, but I'm not sure I trust it to stop all flow after compressor shut-down.

    Sidney has the official word and you should certainly feel comfortable following the recommendations in the AE bulletin.

  10. #10
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    I don't sweat the small stuff emerson. I don't even mind making mistakes, as long as I do it only once. To error is human, to keep repeating that error is dumb.
    A Diamond is just a piece of coal, that made good under pressure!

  11. #11
    Join Date
    Jan 2004
    Location
    Mt. Washington, KY
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    28
    Hey guys thanks for your responses. I followed the instructions from copeland and removed the solenoid valve. If I find any problems with this set up I'll let you know.

  12. #12
    Join Date
    Sep 2002
    Posts
    2,719
    Just the thread I needed had the same exact question on a job today!

  13. #13
    Join Date
    Jan 2006
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    DFW Metroplex
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    4,910
    Quote Originally Posted by weatherpro View Post
    Hey guys thanks for your responses. I followed the instructions from copeland and removed the solenoid valve. If I find any problems with this set up I'll let you know.
    I've seen several DTC's malfunction closed.....not yet seen one fail open and flood out a pump.

    Besides, scrolls can pump liquid - right?
    "The problem is the average person isn’t tuned in to lifelong learning, or going to seminars and so forth. If the information is not on television, and it’s not in the movies they watch, and it’s not in the few books that they buy, they don’t get it" - Jack Canfield

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