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    Back when I worked out in the field I would...

    Back when I worked out in the field I would sometimes see a maintenance guy do something... questionable. When I'd ask why do you that, almost always the answer would be "that's the way we've always...
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    Manufacturer's literature is probably available...

    Manufacturer's literature is probably available online.
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    Your question about service support addresses my...

    Your question about service support addresses my standard recommendation for what brand to choose. I would add to that, whoever has the strongest support IN YOUR AREA. I've seen significant...
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    :cheers:

    :cheers:
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    .

    .
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    A chiller with no water has no load.

    A chiller with no water has no load.
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    Non-condensables can also cause high discharge...

    Non-condensables can also cause high discharge temps.
    And you won't see that on the suction side.
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    From a mechanical cooling perspective, the only...

    From a mechanical cooling perspective, the only difference I see between this chiller and a conventional one is it's ability to (in effect) reduce the load on the chiller (mechanical cooling). Sounds...
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    Duplicate post. sorry, got lost, lol.

    Duplicate post. sorry, got lost, lol.
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    Sounds as though the free cooling is simply...

    Sounds as though the free cooling is simply reducing the load on the mechanical cooling. And that is going to happen during cool or cold weather, when a chiller can sometimes struggle with low head...
  11. Refrigerant cooled maybe? Got a model number?

    Refrigerant cooled maybe?

    Got a model number?
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    Thanks. The main reason I asked is that I was...

    Thanks.
    The main reason I asked is that I was kinda disoriented looking at the pics. I couldn't even tell if it was the same location, lol.
    That is a very nice looking install.
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    I'm not familiar with these, but are saying that...

    I'm not familiar with these, but are saying that there are times when flow is split, and going thru both the free cooling and the evaporator at the same time? If so, I would think the evaporator flow...
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    Are we looking at the old and the new from...

    Are we looking at the old and the new from opposite directions?
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    The Pope's bodyguards are Swiss. The Swiss Guard...

    The Pope's bodyguards are Swiss. The Swiss Guard is considered the smallest army in the world.
  16. Except that some OEMs "overspin" their...

    Except that some OEMs "overspin" their compressors with the VFD.

    I know you already know this. :cheers:
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    This. If somebody was to charge me for...

    This.

    If somebody was to charge me for something I'm using, I'd be upset if they can't show me how they measure how much I'm using. Especially if the billing method changed.
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    Good catch! Now you can find why all three...

    Good catch!

    Now you can find why all three chillers experience "low suction hold warnings".

    Keep us posted.
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    Have you verified this? If not, you should. And...

    Have you verified this? If not, you should. And verify your load, too.
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    I've seen much smaller versions of this sold to...

    I've seen much smaller versions of this sold to customers with no staff, or insufficient staff, result in nightmares. Schools, office buildings, etc...
    Since the chillers are usually undersized for...
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    Lol! Yep, like Icy said, good catch. Book...

    Lol!
    Yep, like Icy said, good catch. Book actually says One Ton Of Refrigeration = 3.515 kW.

    When you don't type and have to finger peck, it's so slow that the disconnect between brain and...
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    Yep, the mass of that motor will hold much more...

    Yep, the mass of that motor will hold much more heat than the air will. In other words, the temperature of that mass will change less, but there is much more mass changing temperature.
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    One BTU = 3.515 kW. That's from my pocket...

    One BTU = 3.515 kW.

    That's from my pocket reference book.
    Those are just two different measurements of energy.
    If you want the science behind converting one to the other, try Googling it in...
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    What Benny said is correct, but I believe it also...

    What Benny said is correct, but I believe it also includes the caveat of no more than 10% per pass. For example, say there are 100 tubes total, 2 passes, with 50 per pass. A total of ten tubes are...
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    That's probably the same outfit that our local...

    That's probably the same outfit that our local Trane office uses. They were guys who used to work for Trane doing this, and then went into business for themselves, if i remember correctly. They are...
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    I would call maintenance. It could be a simple...

    I would call maintenance. It could be a simple fix. Or it could be a symptom of an impending and expensive failure.
  27. Good point. Also verify installed gauges and...

    Good point. Also verify installed gauges and thermometers are correct.
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    Try calling the guy who programmed your...

    Try calling the guy who programmed your Continuum. He is likely the one who named that alarm. It's possible that it's related to staging the chillers. Such as when to start or stop the lag chiller....
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    For some reason, about 70% comes to mind. But I...

    For some reason, about 70% comes to mind. But I don't remember where that number came from.
  30. My money is on things being overridden. Likely...

    My money is on things being overridden. Likely suspect is the pump drive, if there is one. Or a bypass valve. Or more pumps running than required. This could be a long list of possibilities... :grin2:
  31. Get your hands on the building controls prints....

    Get your hands on the building controls prints. The sequence of operation (SOO) on that should have the design differential pressure. Then go from there.

    When I first got my current job, one of my...
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    I check flow by measuring pressure differential...

    I check flow by measuring pressure differential using 1 (one) known good gauge, and moving it from entering water to leaving water. Compare the differential with the manufacturers specs. Be aware...
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    It may be easier to correct the piping than your...

    It may be easier to correct the piping than your customer realizes.
    When I came to work in my current job, I found 5 AHU's were piped backwards! Out of 17 total. Two were on a riser at one end of...
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    Dehumidification will be degraded with piping...

    Dehumidification will be degraded with piping backwards.
  35. Glad you got it solved. Thanks for keeping us...

    Glad you got it solved.
    Thanks for keeping us updated.
  36. From what I can find that unit has several...

    From what I can find that unit has several configurations available, with or without compressors. Maybe there is one control panel available that is configured, or programmed, to each application....
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    I left Trane 9 years ago, and I feel exactly the...

    I left Trane 9 years ago, and I feel exactly the same way.

    Also, the local market seemed to be moving away from centrifugals (at least Trane), and I was very tired of air-cooled chillers,...
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    ::DD:::DD:::DD: That's funny!

    ::DD:::DD:::DD:

    That's funny!
  39. I believe the DOE also does not tell...

    I believe the DOE also does not tell manufacturers how to build equipment, but it does tell them how energy efficient it must be. This indirectly forces how the equipment is designed, and the slower...
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    I like Gatorade's "Frost" line of drinks....

    I like Gatorade's "Frost" line of drinks. Includes "Cool Blue", "Riptide Rush", and my favorite "Glacier Freeze". They have a "crisp" taste, and do not leave any kind of a residue in your mouth. Very...
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    :LOL: Thanks for the laugh! But especially...

    :LOL:

    Thanks for the laugh!

    But especially thanks for sharing your experience.
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    Is there some kind of chilled water reset that is...

    Is there some kind of chilled water reset that is affecting the setpoint? So that the "active" setpoint is higher?
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    Good luck! This makes me even more glad to be...

    Good luck!

    This makes me even more glad to be in-house now.
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    I wonder if if you were to file and/or sand down...

    I wonder if if you were to file and/or sand down the header tube (where flat tubes connect), if you could get a good tight, and reliable, seal using some kind of clamp and gasket? I'm thinking of the...
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    This. And locate the Sequence Of Operations,...

    This.

    And locate the Sequence Of Operations, which should be on the Controls Prints. There should be a statement about dehumidification that will have the humidity setpoint that will put the...
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    The OP has posted a grand total of ONE time. This...

    The OP has posted a grand total of ONE time. This one. Almost four years ago...
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    Nice! I like to see an installation with a...

    Nice!

    I like to see an installation with a permanent setup like that, too.
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    When I measure pressure drop across a vessel, I...

    When I measure pressure drop across a vessel, I don't care how accurate my gauges are. I always use one gauge, moved from one side to the other.

    Also a high pressure at a port does not prove no...
  49. You're welcome. And welcome to the site!

    You're welcome.

    And welcome to the site!
  50. To add to this, the reason your chiller did not...

    To add to this, the reason your chiller did not trip due to high head is that the chiller can tolerate abnormally high head pressure better than it can low oil flow. So the trip setting for "low oil...
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