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Type: Posts; User: lew2

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  1. Replies
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    36,897

    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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    2,961

    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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    36,897

    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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    2,961

    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...
  5. Replies
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    1,499

    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...
  6. Replies
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    818

    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...
  7. Replies
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    1,953

    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
    7,686

    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
    7,686

    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
    7,686

    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
    7,686

    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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    1,000

    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...
  13. Replies
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    756

    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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    1,708

    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...
  15. Replies
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    3,154

    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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    926

    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...
  17. Replies
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    785

    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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    1,261

    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
    1,261

    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
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    7,686

    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...
  22. Replies
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    1,281

    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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    942

    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
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    906

    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...
  25. Replies
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    788

    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...
  26. Thread: McQuay AGZ 055

    by lew2
    Replies
    8
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    1,298

    I don't know of a safe way around the...

    I don't know of a safe way around the transducers. The program in the controller uses them for the control of the compressors, and condenser fans, as well as safety settings.

    The program in...
  27. Replies
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    No

    No
  28. Replies
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    I must admit that at times retrofits really...

    I must admit that at times retrofits really baffel me.

    Why would anyone spend what amounts to basically the price of a new chiller on their old one. Why not just replace it and get a totally new...
  29. Thread: Mcquay

    by lew2
    Replies
    2
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    876

    You have various things that may cause this low...

    You have various things that may cause this low pressure condition in my opinion. Some are simple some are not as you likely know.

    Conditions at the time of the alarm will help determine the...
  30. Replies
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    Just tell John I'm a voice from the past. I'm...

    Just tell John I'm a voice from the past. I'm Lew and he will know who I am. I was an old Westinghouse and McQuay tech as well. Worked some with John many years ago.
  31. Replies
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    2,298

    Massey

    Massey
  32. Replies
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    You should be able to turn the piston to a new...

    You should be able to turn the piston to a new area for the levers to contact.

    You may also be able to build the affected area back up at a machine shop.

    Once had a piston flame sprayed to...
  33. Replies
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    2,298

    freonrick Do you work for John??? If so...

    freonrick

    Do you work for John???

    If so tell him Lew said HI.

    Thanks
  34. Replies
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    Another thread is on this site regarding this...

    Another thread is on this site regarding this problem.

    The control contractor may find it is not an easy task to simply lower the supply air temp. The chilled water temp may need to be much...
  35. Replies
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    2,298

    btexpress has it right!! Typically pressure...

    btexpress has it right!!

    Typically pressure taps on the lines for load, unload, and what is referred to as VC high will reveal what is going on. IMO.

    Vane close problems typically fall into...
  36. Replies
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    1,405

    If it is piped backward the air temperature...

    If it is piped backward the air temperature leaving the coil will be higher than normal. This will likely result in the space humidity levels being higher than may be desired. This may provide more...
  37. Replies
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    1,732

    You may want to be very careful about what you...

    You may want to be very careful about what you say in an exit interview. Anything can and will be held against you. It can also go into your records as I understand it. Did an internet search on...
  38. Replies
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    1,425

    Richard, Any refrigerant schematics or other...

    Richard,

    Any refrigerant schematics or other interesting information
    available?

    If 200Hz is 100%, what is the low end Hz? Does it track lift in any way to keep enough torque to the motor, or...
  39. Replies
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    12,313

    I think you will find the oil injection really...

    I think you will find the oil injection really started on the ALS-C units. ALS-C units have been a "GIGANTIC" step up IMO. This was more than just oil injection to get the unit to that point.
  40. Replies
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    1,202

    Did you get the compressors from a "certified...

    Did you get the compressors from a "certified Copeland dealer" and they are real Copeland reman compressors, right??? Can't say I ever had serious problems with real Copeland compressors before.
    ...
  41. Replies
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    12,313

    How? Looks like a 225 would be three compressor,...

    How? Looks like a 225 would be three compressor, right?

    How much money??
  42. Replies
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    2,660

    If air is not an issue you may want to check for...

    If air is not an issue you may want to check for restricted heat exchangers as well. In the event that the heat exchagers begin to plug up the temps and pressures may increase. Do all the other...
  43. Replies
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    2,506

    Well perhaps Trane could just buy McQuay, what an...

    Well perhaps Trane could just buy McQuay, what an idea.

    Would the FTC let them?
  44. Replies
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    2,506

    I understand the back up of power for spindown in...

    I understand the back up of power for spindown in a power outage.

    The real issue is perhaps a electronics failure that lets it skid in, OUCH. I know it will never happen, right?

    Just something...
  45. Thread: Mcquay Duals

    by lew2
    Replies
    6
    Views
    972

    Need to add that the 8-9 degree subcooling is...

    Need to add that the 8-9 degree subcooling is typical of two pass condenser with a 9-10 degree delta T on the water. Tube fouling at design conditions.
  46. Thread: Mcquay Duals

    by lew2
    Replies
    6
    Views
    972

    I think McQuay still recommends 14-16 degrees...

    I think McQuay still recommends 14-16 degrees discharge SH at full load. This must be with liquid injection turned off and the unit not oil logged. Forget what the suction SH is. I've seen what...
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