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  1. Replies
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    35,214

    Re: Totally baffled

    Let's try this for why the subcooling is lost going through a receiver. "Carrier Handbook of Air Conditioning System Design section 7-61 Liquid subcooling cannot be obtained if a receiver follows...
  2. Thread: Centrifugals

    by lew2
    Replies
    25
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    2,794

    The oil line that comes out of the side of the...

    The oil line that comes out of the side of the compressor and has a check valve typically near the compressor is the high speed thrust oil line. When the compressor is in operation oil is being...
  3. Replies
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    35,214

    If memory serves me two items to keep in mind...

    If memory serves me two items to keep in mind with subcooling.

    Subcooling requires knowing the temperature and pressure at a given point. That is to say taking a pressure reading at one point and...
  4. Thread: Centrifugals

    by lew2
    Replies
    25
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    2,794

    First as a former McQuay Service tech let me...

    First as a former McQuay Service tech let me stick up for the tech support crew. For those that may may not know it tech support is a very tasking job. Just imagine the calls they get on various...
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    Not sure what the point of adding a few ounces of...

    Not sure what the point of adding a few ounces of oil to the system would do. If the oil does not remain in circulation what is it to lubricate? Such a small amount of oil would likely just find...
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    745

    Carbon disk may have some advantages over the...

    Carbon disk may have some advantages over the type of disk I have seen used on the Sanyo units.

    If you go with a 15 # rated carbon disk you may want to insure it has a vacuum bar to prevent it...
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    1,780

    If I recall correctly the IQ 1000 II will...

    If I recall correctly the IQ 1000 II will transition on either amps or time. We use to set them to transition as the current decayed back to 90% or RLA or 25 seconds. The settings are adjustable as...
  8. Thread: Mcquay screw

    by lew2
    Replies
    66
    Views
    7,084

    Cardinals had a great year!!!! Boston had a...

    Cardinals had a great year!!!!

    Boston had a better one, it seems!!!!!!

    Yes I did know that they have compressors with over 60k hours on them.

    I think as in life some people "suspect" a great...
  9. Thread: Mcquay screw

    by lew2
    Replies
    66
    Views
    7,084

    Never used the word "defective", simply asked a...

    Never used the word "defective", simply asked a basic question. I actually think that at times manufactures do get materials that may not be of the quality they expect from various places. If they...
  10. Thread: Mcquay screw

    by lew2
    Replies
    66
    Views
    7,084

    Don't think I stated it was a fact. Ever...

    Don't think I stated it was a fact.

    Ever seen gate material fail and not have a bearing fail?

    Ever seen bearings fail and not destroy the gate material?
  11. Thread: Mcquay screw

    by lew2
    Replies
    66
    Views
    7,084

    Are you saying that McQuay never had "suspect...

    Are you saying that McQuay never had "suspect gate material"?????????
  12. Thread: approach question

    by lew2
    Replies
    10
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    917

    Here's my take on approach temps on chiller...

    Here's my take on approach temps on chiller evaps, this should hold true for flooded as well as DX.

    In that perfect chiller in the sky where everything does remain constant with refrigerant feed...
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    658

    Let's see if I have this right. You need to...

    Let's see if I have this right.

    You need to come out of a "free cooling" mode and go to mechanical cooling, and the chiller trips?

    The tower water is colder than the chilled water loop at this...
  14. Replies
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    1,514

    Condenser water relief is simply lower condenser...

    Condenser water relief is simply lower condenser water temperatures the way I think of it. What is required depends on how you wish to control it. Condenser water temperture is limited by wet bulb...
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    2,943

    What is the problem with the dual 126's? I know...

    What is the problem with the dual 126's? I know of several installations where they work great. Setup is very important for the successful operation of any dual unit.
    JMO
  16. Thread: winter coil prep

    by lew2
    Replies
    12
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    819

    I think you will actually find that glycol does...

    I think you will actually find that glycol does not aid in heat transfer. Do a coil or chiller performance check with water and glyclol and see how it turns out. If I recall as the glycol solution...
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    Never really thought about this before. When...

    Never really thought about this before.

    When you say raise the ground water temperature in a certain area does that imply that the ground water is not moving? It would seem that the ground water...
  18. Done correctly by qualified people they are worth...

    Done correctly by qualified people they are worth the money!!!

    Like any service, as good as the one doing the service.

    Just my opinion.
  19. Thread: AAON

    by lew2
    Replies
    9
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    1,204

    Check with the drive company on their...

    Check with the drive company on their recommendations on line reactors.

    Do a web search.
  20. Thread: AAON

    by lew2
    Replies
    9
    Views
    1,204

    What brand of drive is it? You do need to...

    What brand of drive is it?

    You do need to make sure the drive is set up correctly. This is crucial for the success of the drive and motor.

    Is the unit equipped with line reactors? Have had...
  21. Thread: Mcquay screw

    by lew2
    Replies
    66
    Views
    7,084

    This CEK sounds like a cool deal. So what %...

    This CEK sounds like a cool deal.

    So what % of the price of a new unit would it cost to install it on a 2 compressor unit? Please give options such as new compressors and cleaning the condenser...
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    What are the minimun and maximum Hertz settings...

    What are the minimun and maximum Hertz settings in the drive? Would seem to me that the minimum would be critical.
  23. Replies
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    I seem to be missing several things here about...

    I seem to be missing several things here about the actual system pipe lay out.

    I know of a system that is only 14 stories tall with pumps on various floors pulling off the condenser loop. The...
  24. Thread: GPM question

    by lew2
    Replies
    6
    Views
    851

    Seems like the pressure drop is to the square of...

    Seems like the pressure drop is to the square of flow as I recall. Thus if the flow was to double the pressure drop would increase by a factor of 4. This is for a typical chiller or condenser...
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    I remember once getting a very poor reading on a...

    I remember once getting a very poor reading on a PEH100 that had been retrofitted to 134A. We didn't think it had that much liquid in the motor cavity but it apparently did. Went so far as to pull...
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