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  1. #1
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    Lets talk about Scrolls running in a vacuum

    Tell me whats you have seen.

    Just this last week I had a liquid solenoid that failed to open. Well someone thought that 90 second time delay on LP trip was a good ideal.

    Now i have a SHTF compressor and all the oil is in the condenser.



  2. #2
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    What is a SHTF compressor?


    Quote Originally Posted by jimp View Post
    Tell me whats you have seen.

    Just this last week I had a liquid solenoid that failed to open. Well someone thought that 90 second time delay on LP trip was a good ideal.

    Now i have a SHTF compressor and all the oil is in the condenser.


    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  3. #3
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    Poop Hits The Fan

  4. #4
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    What's it in?
    Seen a few scrolls with bypass timers for cold weather.
    Heatcraft uses em. 2 minute bypassI think .

    Sent from my SM-G950U using Tapatalk

  5. #5
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    Thread Starter
    Quote Originally Posted by icy78 View Post
    What's it in?
    Seen a few scrolls with bypass timers for cold weather.
    Heatcraft uses em. 2 minute bypassI think .

    Sent from my SM-G950U using Tapatalk
    Its on a chiller.

    But how long can a scroll last running in a vacuum?

  6. #6
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    Kinda depends on how deep of a vac the system runs in. Some Scrolls have a Compression Ratio sensor that stops the comp from pumping for a anti-deep vac protector. What comp do you have?

  7. #7
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    Thread Starter
    Quote Originally Posted by TechmanTerry View Post
    Kinda depends on how deep of a vac the system runs in. Some Scrolls have a Compression Ratio sensor that stops the comp from pumping for a anti-deep vac protector. What comp do you have?
    10 HP Panasonic, and I have asked for the tech info.

  8. #8
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    Am I to understand that the OP's position is that this scroll compressor ran in a vacuum for 90 seconds and that is what caused all the oil to log in the condenser and scramble an otherwise fine compressor?

    Quote Originally Posted by VTP99 View Post
    Poop Hits The Fan
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  9. #9
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    90 seconds? Is this a built up system?
    Give me a relay with big enough contacts, and I'll run the world!

    You can be anything you want......As long as you don't suck at it.

    If a person wants to create a machine that will be more likely to fail...Make it complicated.

    USAF 98 Bomb Wing 1960-66 SMW Lu49

  10. #10
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    Quote Originally Posted by Poodle Head Mikey View Post
    Am I to understand that the OP's position is that this scroll compressor ran in a vacuum for 90 seconds and that is what caused all the oil to log in the condenser and scramble an otherwise fine compressor?
    One would assume so given the post provided. Which, ironically, contradicts what appears to be a normal sounding/pressurizing compressor in the same post video.

  11. #11
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    Quote Originally Posted by Poodle Head Mikey View Post
    Am I to understand that the OP's position is that this scroll compressor ran in a vacuum for 90 seconds and that is what caused all the oil to log in the condenser and scramble an otherwise fine compressor?
    X2,

    I was wondering about that.

  12. #12
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    Quote Originally Posted by jimp View Post
    Its on a chiller.

    But how long can a scroll last running in a vacuum?
    There is nothing specific about how long a scroll will last running in a vacuum. It would depend greatly on the strength of the vacuum to. The AE bulletin simply say not to run a scroll in a deep vacuum. I think one can be sure that manufacturers who install a bypass timer on their scroll compressors, including Emerson, are not too concerned. They are counting on a a low pressure switch that should eliminate, or at least greatly slow, reoccurrence.
    So in the instance of a compressor failing to build pressure enough to close the low pressure switch there would be sufficient time for it too cool before the next attempt at running. I guess maybe that doesn't answer your question at all but I think it definitely points out that the chances of running in a deep vacuum are pretty slim. This of course is assuming that nobody has bypassed the low pressure switch, like I found a few times lol. Or a welded contactor I guess.

    Sent from my SM-G950U using Tapatalk

  13. #13
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    Lennox RTU upon arrival scroll running in vacuum for God only knows how long because of a failed power element.
    Replaced TEV and everything back to normal.

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