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  1. ^ No new installs with HCFC refrigerants due to...

    ^ No new installs with HCFC refrigerants due to the phase out... Maybe doesn't apply here?
  2. Worn contactors on 3-phase compressors can ground...

    Worn contactors on 3-phase compressors can ground them. (Single phase the motor and it's toast very quickly)

    Floodback can do it.

    Low side leaks on systems that run in a vacuum eventually do...
  3. Take any fan blade, flip it over, and the blade...

    Take any fan blade, flip it over, and the blade pitch is still in the same direction. It still flows air one way, only less efficiently in the case of a typical evap or condenser blade.

    A ceiling...
  4. It happens even with the big money biotech...

    It happens even with the big money biotech companies too.

    I recently spent 4+ months working on a freeze drier that had been sitting unused for TWO YEARS. It was sitting idle because the person...
  5. We cut one open at our shop after it restricted...

    We cut one open at our shop after it restricted completely. Total blockage. Found the desiccant encased in what looked like epoxy. We just figured that must be what happens when you put too much of...
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    Cincinnati Sub Zero makes test chambers with...

    Cincinnati Sub Zero makes test chambers with 410A. They have one with a compound compressor that will make -50C on 410A. It looks like a great low temp refrigerant when you're looking at the PT...
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    I've got a cascade process chiller with redundant...

    I've got a cascade process chiller with redundant compound Bitzer compressors for the low stage. -47F, also R507. Interstage suction cools a plate heat exchanger to subcool the liquid line before...
  8. Thread: r12 walk in

    by cmclifton
    Replies
    94
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    1,800

    Coalescing oil separators, and just the simple...

    Coalescing oil separators, and just the simple fact that there's no oil left in the stream by the time you get past the last receiver and heat exchanger. The argon doesn't carry the oil the way the...
  9. Thread: r12 walk in

    by cmclifton
    Replies
    94
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    1,800

    The overall COP... I haven't the slightest. I...

    The overall COP... I haven't the slightest. I wouldn't expect it to be good. 3 horse scroll to cool 5 cubic feet with something like 80% "on time". The rest... tbh I don't have the vocabulary to...
  10. Thread: r12 walk in

    by cmclifton
    Replies
    94
    Views
    1,800

    In the case of a Thermo -150 freezer, that argon...

    In the case of a Thermo -150 freezer, that argon does get somewhat condensed. It never becomes a full column of liquid, but it's not just there to keep pressures up. It's the argon that cools the...
  11. Thread: r12 walk in

    by cmclifton
    Replies
    94
    Views
    1,800

    I work on those things too. (-150 is a little...

    I work on those things too. (-150 is a little more common) You can't measure superheat and you know it.

    One of those refrigerants is argon. You're not ever going to get a Copeland engineer to be...
  12. Thread: r12 walk in

    by cmclifton
    Replies
    94
    Views
    1,800

    I know this is a waste of time, but I have to see...

    I know this is a waste of time, but I have to see this play out... What refrigerant is in that mythological piece of equipment that has 20 degrees superheat and 80 degree return gas?
  13. Thread: r12 walk in

    by cmclifton
    Replies
    94
    Views
    1,800

    Don't try too hard. There's very little logic...

    Don't try too hard. There's very little logic involved in checking subcooling on systems with receivers and ignoring superheat at the compressor ...And then calling the return gas temp measurement...
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    Me too :) the Wikipedia link was an afterthought....

    Me too :) the Wikipedia link was an afterthought. "Wait what if he's being serious?"
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    Subcooling is what fools people into thinking...

    Subcooling is what fools people into thinking they're fully charged when they've got a flashing sight glass and nitrogen in the top half of their condenser coil...
    ...
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    I'd hope so, but I've never seen a rack at full...

    I'd hope so, but I've never seen a rack at full capacity. I never got to do anything but service work on existing stores. I'd consider myself a complete failure if I let enough cases warm up to bring...
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    Now there's a good question. An R507 rack at...

    Now there's a good question.

    An R507 rack at ~30% capacity will definitely make you ponder that one. I think it's only there so you can look in there and imagine what it would feel like to be a...
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    Stop it. You're going to give someone a heart...

    Stop it. You're going to give someone a heart attack. :Faint:
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    What it does mean is that you don't get to...

    What it does mean is that you don't get to change what the subcooling is unless you have an active subcooling system (compound compressor or separate subcool system maybe). The fact that you have a...
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    "How am I going to get these guys to agree with...

    "How am I going to get these guys to agree with me that subcooling matters a lot on walk-in systems with receivers? I know, I'll make up a test scenario on something that is not at all like a walk-in...
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    No doubt. Your receiver is then filled to...

    No doubt. Your receiver is then filled to capacity and liquid is stacking in the condenser. It's most certainly overcharged. How often do you see this? I've seen it ONCE, on a unit that needed a...
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    You're talking about something else entirely now....

    You're talking about something else entirely now. If the subcooling changes throughout the cycle, it has absolutely nothing to do with whether or not your charge level can be determined by...
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    I've done it. Subcooling stayed pretty constant...

    I've done it. Subcooling stayed pretty constant from the time the sight glass cleared up until the point that the unit had enough gas in it to start raising head pressure because the receiver was...
  24. Thread: fate OF 404A

    by cmclifton
    Replies
    12
    Views
    665

    R134a is the offender now. Nobody is going to...

    R134a is the offender now. Nobody is going to start using it in new equipment that never used it before. It's going to go away and all the blends that use it are also going to go away.
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    I'd still be broke. I don't think I've ever had...

    I'd still be broke. I don't think I've ever had that happen!
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