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Type: Posts; User: Chiller Guy

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  1. Replies
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    I can give you some idea's from here in the S....

    I can give you some idea's from here in the S. Pa. area (Kennett Square, Kaoln, Avondale). Most of the houses are small "chicken house" like buildings that are totally enclosed so the enviornment can...
  2. The evap side looks Ok. You show making 4 degrees...

    The evap side looks Ok. You show making 4 degrees thru the bundle with an approach of 2-3 degrees. Check the belly temp and compare it to the evap pressure and leaving chill h2o when you get time....
  3. So you have 73/76 cond h2o in & out with an 84...

    So you have 73/76 cond h2o in & out with an 84 degree liquid temp off the cond. These machines were usually at 10/10/10 at full load. That is 85/95/105 on the liquid temps. You are showing 8 degrees...
  4. You should be able to pick up fouling by using...

    You should be able to pick up fouling by using the approach.

    What problem are you having? Perhaps we can help!
  5. I figure you should need about 1224 gpm thru the...

    I figure you should need about 1224 gpm thru the cond for 425 tons @ a 10 delta T. That flows should produce about 13' delta P

    The single pass evap can vary if you know the delta T (5-8-10) or...
  6. No recommended delta p. It will be a function of...

    No recommended delta p. It will be a function of flow, but here are the numbers to work with.
    Delta p on cond at min flow = 2'
    at max flow = 21'

    Delta p on 1 pass evap at...
  7. Chet, I hope this is some help! PCV-4D-C1-D2...

    Chet,
    I hope this is some help!

    PCV-4D-C1-D2 = Packaged CentraVac
    4= 400 Tons
    D = part of 100 tons (in this case I beleive it was 25 tons)
    ...
  8. Replies
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    500

    See if this helps, Packaged Centravac -275...

    See if this helps,

    Packaged Centravac -275 tons capacity
    2 pass Evap (Ithink)
    2 pass cond
    208 gpm min on 2 pass evap -695 gpm min on 1 pass evap
    765 gpm max on 2 pass evap - 1530 gpm max on 1...
  9. There are a lot of charts. What model are you...

    There are a lot of charts. What model are you looking for?
  10. Replies
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    959

    Seems to me that anything as aggressive as...

    Seems to me that anything as aggressive as sandblasting could screw up the balance of an expenesive impeller.
  11. Replies
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    1,097

    When looking at a wiring diagram think of the...

    When looking at a wiring diagram think of the relay/switch still in the box an a suppliers shelf. That is the position of the contacts depicted NO/NC. Another way is to think of the unit condition...
  12. Replies
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    2,552

    VRF Systems

    Looking for some opinions here if you guys aren't too shy (ha). Was looking at some building prints today that is designed around Daikin geothermal units and Variable Refrigerant Flow. I know these...
  13. Replies
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    981

    There are several of us here that know how to do...

    There are several of us here that know how to do this calulation and I recall it being addressed in earlier posts. As mentioned, your best bet is to contact either the compressor manufacturer for...
  14. Replies
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    2,502

    The training issue has been around forever and as...

    The training issue has been around forever and as we can see its handled in differet ways throughout the country. Many owners/bosses are short sighted here fearing the loss of a tech whom they have...
  15. Replies
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    1,823

    Try to get some training. Self teaching could be...

    Try to get some training. Self teaching could be expensive. They are sometimes called "chemical time bombs" among other things and with good reason. You need to be part mechanic. part chemist. part...
  16. Replies
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    6,772

    Again, two seperate circuits exibiting almost the...

    Again, two seperate circuits exibiting almost the same conditions! What is common to both?
  17. Replies
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    2,040

    I'm in Delaware and know what kind of weather we...

    I'm in Delaware and know what kind of weather we are having here and probably there! We are at or above design conditions a lot this year. Whats chances that you have more load than you have machine?...
  18. Replies
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    6,772

    200 feet of piping and a history of losing...

    200 feet of piping and a history of losing compressors makes me think oil return ( or lack of). Do a calculation on the pipe sizing. Suct & liquid.
  19. Replies
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    2,079

    The Key words are"may be". If you start playing...

    The Key words are"may be". If you start playing chemist out in the field it may get messy and you are going to assume a lot more responsabitily than you already have on your shoulders. Admittedly, I...
  20. Replies
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    2,079

    One of the reasons that Trane changed inhibitors...

    One of the reasons that Trane changed inhibitors through the years was the use of different materials in the tube bundles, especially concentrators on high temp machines. May be part of the answer.
  21. Replies
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    2,079

    The purpose for the inhibitors(protecting the...

    The purpose for the inhibitors(protecting the shell/tubes, adjusting Ph, preventing hydrogen, etc) is not the issue. The inhibitors do not get along with one another and could give you fits as...
  22. Replies
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    4,320

    I do not think this has gotten out of hand as it...

    I do not think this has gotten out of hand as it is a way for all of us to learn. It would go a lot faster if we were all together over a Corona (or your choice) but this is the way we are doing it....
  23. Replies
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    4,320

    The certification exams were and are developed by...

    The certification exams were and are developed by many organizations but all have to meet some federal guidelines. The tests came from a library of questions put out by the feds and differed from...
  24. Replies
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    4,320

    Mr Smith pretty well outlined the "flushing...

    Mr Smith pretty well outlined the "flushing procedure" that I was taught and used. The refractometer has been around for this purpose for a looong time. The issue here is one I thought we all would...
  25. Replies
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    4,320

    In trying to remember the procedure for...

    In trying to remember the procedure for conversion from mineral oil to synthetics I recall a " Flushing process" to get the mineral oil content down to acceptable levels. During this process the two...
  26. Replies
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    836

    The static pressure sensor could be installed out...

    The static pressure sensor could be installed out in the duct work.
  27. Thread: Fan Curves

    by Chiller Guy
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    3
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    742

    Carnak, First "Thanks " for the lead and I...

    Carnak,

    First "Thanks " for the lead and I will check it out today.
    Second, I have 4 I-Pak II units (100 & 150 T) all of which were surging. They all have Airfoil fans.
  28. Thread: Fan Curves

    by Chiller Guy
    Replies
    3
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    742

    Fan Curves

    Gentlemen,

    Am looking for printable fan curves (any manufacturer) that have the surge line shown on the curve. Prefer comm. equip (20,000 CFM cent fans, or so). Fans can be BI, FC or airfoil as...
  29. Replies
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    4,217

    Did not know there was any 2 phase still around....

    Did not know there was any 2 phase still around. Used to be a lot in the Chester, Pa. area. I guess S.E. Pa. was an area for it if Philly still has some. I recall it all being 4-wire and a bit...
  30. Replies
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    665

    Is this a new or old problem? Are you connected...

    Is this a new or old problem? Are you connected to a Tracer/Summit system? Have there been any programming changes made about the time this problem started? Have you checked the Hi static cutout...
  31. Replies
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    1,049

    Just a thought here but these units with...

    Just a thought here but these units with manifolded compressors have a passive oil return system designed into them. This system consists of orfice's installed in the suction lines to create pressure...
  32. Replies
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    3,562

    Do you think it could be duct work...

    Do you think it could be duct work design/installation or static losses?
  33. Replies
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    3,179

    These installations can get very ugly...

    These installations can get very ugly (experience).You should consider working to a design that is stamped by a PE. There are so many rules and reg,s, potential health issues,etc that it can make...
  34. Replies
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    6,797

    Again. the megger is only one more tool to help...

    Again. the megger is only one more tool to help you with your diagnostic's. However, it is not worth a flip to you (actually dangerous) if you do not know how to use it and what it is telling you. As...
  35. Replies
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    5,366

    The tandem compressors depend on a passive oil...

    The tandem compressors depend on a passive oil recovery system which needs the orfices to operate properly. Replacement compressors usually include new orfices and a statement "that they must be...
  36. Replies
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    3,123

    Mark, If I read your post correctly the VAV"s...

    Mark,
    If I read your post correctly the VAV"s have to be Trane. If so, the boxs should ship with all the controls mounted. This should simplify some of your problems.
  37. Replies
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    5,366

    The take-away I am getting from this thread is...

    The take-away I am getting from this thread is that there is No reson to change more than the faulted compressor on a tandem (not just dual units) set except for local judgement calls or a request...
  38. Replies
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    5,366

    I may have missed the memo but cannot remember...

    I may have missed the memo but cannot remember seeing anything about dual tandem compressors needing to be changed in the event one fails. Can you piont me to some literature that will give me some...
  39. Replies
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    5,366

    You should be able to pump the oil out through...

    You should be able to pump the oil out through the oil charging valve. You will not get it all but the dip tube gets down fairly low in the sump. This still will not remove any oil laying out in the...
  40. Replies
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    699

    It's an old 7.5 ton, self contained , rooftop...

    It's an old 7.5 ton, self contained , rooftop (maybe with heat) and probably 208 V. This is just from memory. The keyword is OLD.
  41. Replies
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    1,480

    Have to agree with Jayguy - "overcorrection" can...

    Have to agree with Jayguy - "overcorrection" can cause issues just as can "no correction". With the PFCC connected to line side you are affecting everything else on that line. Some items may not need...
  42. Replies
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    2,367

    Model and Serial numbers will help!

    Model and Serial numbers will help!
  43. Replies
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    1,453

    You referr to units. What is the common...

    You referr to units. What is the common denominator here? All the dampers leaking or the caulk shrinking.
    If you have not had performance problems in the past you probably don't have them now....
  44. Replies
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    1,453

    Check the gasketing on the doors and the seams...

    Check the gasketing on the doors and the seams where the units join. You may have to pull up the metal strips on the roof where the sections join but they will dry out and the caulk shrink over time.
  45. Replies
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    1,681

    Sounds like a 6 cylinder model F. After removing...

    Sounds like a 6 cylinder model F. After removing the retainer ring the the terminal plate should pull out. They are a close fit and may require some wiggeling but the retainer is all that holds it in...
  46. Replies
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    4,850

    I agree with Super Tech on liquid charging. If...

    I agree with Super Tech on liquid charging. If you drop as much charge into the unit as possibe through the high side you can then top off the charge by liquid charging through the suction side.That...
  47. Replies
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    982

    Have used the"Prevac" systems since they hit the...

    Have used the"Prevac" systems since they hit the market a (few) yrs ago. Initial cost is a factor but lifetime savings should be considered. Do you do an annual leak check? How many hrs to set up and...
  48. Replies
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    2,411

    Post operating conditions. Has alot to do with...

    Post operating conditions. Has alot to do with oil return.
  49. Don't know that you can have "one size fits all"...

    Don't know that you can have "one size fits all" apply here. You will have to make the call based on what you observe. Unit size, loop size, pump size, temp being maintained (desired and actual)...
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    I'm not sure you need any traps here but one...

    I'm not sure you need any traps here but one place to consider is at the outlet of the evap. You don't want oil draining back into the coil. Pitch the suction line from the top the evap riser in the...
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