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  1. Replies
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    Don't forget the condensate drains for all those...

    Don't forget the condensate drains for all those FCUs. They are a major headache for us.
  2. This ^

    This ^
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    There are 6 of us in our crew. We've been split...

    There are 6 of us in our crew. We've been split into 2 crews and we're on alternating days.
    This started Tuesday (day before yesterday). That was the day after I had returned to work after being out...
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    :cheers:

    :cheers:
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    I'm about 3 or 4 episodes into season 4. So far,...

    I'm about 3 or 4 episodes into season 4. So far, I like it. The main plot has shifted from the protomolecule itself to what they believe may be the (extinct) creators of the protomolecule. Most of...
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    Thanks. I have not yet had the time to research...

    Thanks. I have not yet had the time to research this further, so this is helpful.
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    It's the Arc Fault function of a Dual Function...

    It's the Arc Fault function of a Dual Function Circuit Interrupter that interests me. I don't want to give up the GFCI, but if I can combine it with a AFCI (in the same outlet), then that's...
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    This thread has led me to Google "combined...

    This thread has led me to Google "combined GFCI/AFCI receptacles". It mentioned that there is a DFCI (Dual Function Circuit Interrupter) device available. This was in response to a question asked 3...
  9. Technically, this ship is not , and will not be...

    Technically, this ship is not , and will not be "commissioned". It will be the USNS Harvey Milk, not the USS Harvey Milk. The difference is that USNS (US NAVY SHIP) is owned by the Navy, but it is...
  10. The Secretary of the Navy names ships. Once a...

    The Secretary of the Navy names ships. Once a future ship is named (that is, prior to being built), it is unlikely that its name will be changed by a later SECNAV. I'm only aware of that happening...
  11. It seems to me that for the last several years...

    It seems to me that for the last several years the only thing more lost than ship design and planning is ship naming. It's definitely not the same Navy I was in back in '79-'85.
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    The compressor is configured differently. Both...

    The compressor is configured differently. Both impellers are on the same side of the motor, so there is just one shaft sticking out of one end, and the compressor is located on top of the evaporator...
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    Speaking solely to Trane chillers, a new 1500 ton...

    Speaking solely to Trane chillers, a new 1500 ton chiller (likely a CVHF) has a smaller footprint than a 1980's 1500 ton chiller (CVHB). At least, I believe that's so. I never actually measured that....
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    In the case of those two chillers it's mostly due...

    In the case of those two chillers it's mostly due to the different types of compressors. York has single stage compressor (one impeller) spinning at a faster rate, Trane has a two stage (two...
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    For future use, I believe the module will hold...

    For future use, I believe the module will hold its memory for long enough to change out the battery, so make that part of scheduled maintenance. Had one under contract years ago, I think we did that...
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    Maybe I'm missing something, but how do you do...

    Maybe I'm missing something, but how do you do this?
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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:
  21. Replies
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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.
  26. Replies
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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...
  27. Refrigerant cooled maybe? Got a model number?

    Refrigerant cooled maybe?

    Got a model number?
  28. Replies
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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.
  32. 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.
  43. Good point. Also verify installed gauges and...

    Good point. Also verify installed gauges and thermometers are correct.
  44. Replies
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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.
  46. 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:
  47. 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.
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