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Type: Posts; User: Eric S

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  1. I suspect has to do with economy of scale. A...

    I suspect has to do with economy of scale. A factory can produce a million 3/4 horse single phase motors more cheaply per motor than the factory that produces a quarter million3/4 horse three phase...
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    What I've heard about supply air control is that...

    What I've heard about supply air control is that the unit stages the compressors to maintain a cold under floor temp, keeping a consistent temperature in the contained cold aisle. A VFD controls the...
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    Weird. Did they add a crank case heater?

    Weird. Did they add a crank case heater?
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    How do you measure/calculate the CFH you are...

    How do you measure/calculate the CFH you are using? Is it the same flow rate for different pipe sizes?

    I always just put 2 or 4 psi on the gauge. That puts more CFH in a larger pipe than a smaller...
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    good point

    good point
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    Not possible at the time. No room in the schedule...

    Not possible at the time. No room in the schedule for doing work twice. Not to mention the price of a wasted fitting. $$$
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    Inside a pipe brazed with nitrogen

    Just a cool Pi I took on an install six months ago. It's a 2 1/8 return line on a Leibert XD system. They tell you in class that you flow Nitrogen to prevent oxidation on the inside of the pipe but...
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    The dozen installs I've seen with tees used...

    The dozen installs I've seen with tees used regular tees. Though if you are concerned about equal flow, you might put the liquid line into the branch and out the sides to the txvs.
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    We put 60 minisplits in an apartment building....

    We put 60 minisplits in an apartment building. Every one of them went onto a concrete interior wall. We ran all of the line sets in a paintable plastic snap together linehide system. It was pretty...
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    We had a starter trip because a loose wire...

    We had a starter trip because a loose wire connection overheated the overload.

    You have to be aware of the genre you are reading. The trip curve is technical literature. The Ratings in the...
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    My comany has put in furnaces with the evaporator...

    My comany has put in furnaces with the evaporator upstream of the Heat exchanger. It was for dehumidifying a swimming pool room. Had to have a stainless heat exchanger though.
  12. Thread: Any Ideas?

    by Eric S
    Replies
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    913

    I just about burned myself on a discharge line...

    I just about burned myself on a discharge line this morning. I had to weave my hand in past one compressor to put my hose the suction of the other. It was a scroll compressor running normally.
  13. Thread: Weird Problems

    by Eric S
    Replies
    2
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    558

    I dealt with one of those. It was a mini split in...

    I dealt with one of those. It was a mini split in a computer room. It had apparently been charged solely by superheat with no look at subcooling. I pulled one and a half pounds out and put seven...
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    I installed 60 LG mini splits in an apartment...

    I installed 60 LG mini splits in an apartment building. In the past 2 years since the install, We've replaced 2 maybe 3 boards and 5 temperature sensors. I really don't know if that's a good or bad...
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    the zeros are place holders for options. Each...

    the zeros are place holders for options. Each place that isn't a zero but a letter or other number instead is a factory installed option like an economiser, a duct smoke detector, or whatever else....
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    I've seen internal winding stats, temperature...

    I've seen internal winding stats, temperature activated. I've also seen Compressors on motor starters. There's no difference to the compressor itself if there's a solid state overload relay. You size...
  17. Thread: RH control

    by Eric S
    Replies
    3
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    587

    I think you would want 2 Air handlers for energy...

    I think you would want 2 Air handlers for energy efficiency if nothing else. To get 35% humidity at 70 degrees you will have to cool the supply air to 40 degrees or lower. A typical VAV system...
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    That is one heck of a construction elevator. I'd...

    That is one heck of a construction elevator. I'd hate to have experienced my first ride in one of those things there.
  19. i got my laboratory test report back. the acid...

    i got my laboratory test report back. the acid number is less than 0.01.
    But it shows 67 ppm moisture which the lab calls marginal. They recommend just watching the system, and retesting in a couple...
  20. Thread: Daikin VRV

    by Eric S
    Replies
    49
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    6,656

    One of the Mitsubishi projects I was involved...

    One of the Mitsubishi projects I was involved with several years ago had some loose flares. The Mitsubishi I'm installing right now has braze joints at the indoor units. Only flares are on the BC...
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    Do you have any Pex pipe in the system? It has to...

    Do you have any Pex pipe in the system? It has to be bought with a specific coating for heating systems. Often it's a red color. The polyethylene itself is oxygen permeable.
  22. Thread: Daikin VRV

    by Eric S
    Replies
    49
    Views
    6,656

    I've installed a half dozen VRV systems from a...

    I've installed a half dozen VRV systems from a few manufacturers. I did a Daikin last fall. It was the second system that I know of installed for that city government. The customers decided to go...
  23. I have not had the oil Lab tested. I probably...

    I have not had the oil Lab tested. I probably will.
    The variable speed condenser fan controls discharge pressure to 225 to 230 psi. R-22 BTW.
    When the unloader is activated that head gets very hot....
  24. I have been servicing these units for the past...

    I have been servicing these units for the past year. I have changed the valve plates on all six compressors in the room.
    Yesterday, I put a third set of replacement plates on this particular...
  25. Pump down Failure on Liebert (Carlyle Semi hermetic)

    Liebert Model DH199AUCAEI
    Carlyle Compressor model 06DF8182AA3200

    My data center customer has three Liebert downflow DX CRAC units, approximately eight years old. I upgraded the boards to the new...
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