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Type: Posts; User: RobY

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  1. Replies
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    Views
    2,163

    It is common for some mechanical contractors to...

    It is common for some mechanical contractors to pull a refrigerant sample on a regular basis to find out what the quality of the refrigerant in the unit is. You can do things like trend the moisture...
  2. Replies
    10
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    2,546

    We have enough R-22 on hand to last for a while....

    We have enough R-22 on hand to last for a while.

    The more people fix leaks and recover and reuse the R-22, the longer it will last. The more venting / leaking, the sooner it will go short. This...
  3. Replies
    10
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    2,546

    We test these oils daily from sample kits sent in...

    We test these oils daily from sample kits sent in from HVAC/R equipment in the field. My lab can tell the difference between the Mobil (Hatcol) and Trane (Lubrizol) POE lubricants when we run the...
  4. Replies
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    2,546

    The Carlyle recip compressors are approved to use...

    The Carlyle recip compressors are approved to use Emkarate RL68H. The Carrier centrifugals are not approved for RL68H in all cases. Carrier is working on approving replacements for the Castrol SW...
  5. Replies
    10
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    2,546

    Trane 48 is a 68 cSt viscosity POE lubricant...

    Trane 48 is a 68 cSt viscosity POE lubricant based on Emkarate RL68H.

    Mobil EAL Arctic 68 is also a 68 cSt viscosity POE, but is no longer sold under that name, it is now called Hatcol 3693.
    ...
  6. Thread: R22 to MO 99

    by RobY
    Replies
    9
    Views
    3,753

    The area to watch our for with TXV sizing is if...

    The area to watch our for with TXV sizing is if you are running the rack with a lot of sub-cooling. Many of the R-22 replacements will need higher mass flow rates at high sub-cooling values than the...
  7. Thread: R 507

    by RobY
    Replies
    24
    Views
    2,392

    There was an ARTI MCLR report on compatibility of...

    There was an ARTI MCLR report on compatibility of engineering plastics and refrigerants / lubricants done in 1993. Here is a link to the final report, although the US government wants money to get a...
  8. It works. It has been working since the mid...

    It works. It has been working since the mid 1990s when some supermarket chains started using it in the Northeast US as an alternative to R-502 and R-404A/R-507 in new equipment. I was supporting it...
  9. Replies
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    1,225

    When your system was punctured, you may well have...

    When your system was punctured, you may well have lost some oil when the refrigerant charge escaped. Refrigerant and oil will always travel together in the system, and when you lose the refrigerant,...
  10. Thread: York Oil

    by RobY
    Replies
    23
    Views
    8,913

    Call the URI store direct in Montgomery. You...

    Call the URI store direct in Montgomery. You will likely get a better price than what is shown on the internet, which is the pricing with no discounting at all. Let the store know what the York...
  11. Thread: York Oil

    by RobY
    Replies
    23
    Views
    8,913

    United Refrigeration carries a lot of the Solest...

    United Refrigeration carries a lot of the Solest product line. Solest 120 is definitely in their system.

    Rob Yost
    National Refrigerants
  12. Thread: York Oil

    by RobY
    Replies
    23
    Views
    8,913

    Here is the source of the bad information on York...

    Here is the source of the bad information on York 'L'

    http://www.nucalgon.com/assets/prodlit/3-245.pdf

    York 'L' is based on CPI Solest 120. I let Nu-Calgon know a couple of years ago their...
  13. Thread: oil mixture

    by RobY
    Replies
    4
    Views
    1,109

    They are fine when mixed together. Remember that...

    They are fine when mixed together. Remember that R-401 and R-402 call for a 50:50 mixture of MO/AB to get better oil circulation.

    Rob Yost
    National Refrigerants
  14. Replies
    14
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    1,552

    The plastic bottles don't allow moisture through...

    The plastic bottles don't allow moisture through that fast. It normally takes many months for the samples to pick up as much as 100 ppm of moisture.

    I can't tell you how many samples we have lost...
  15. Replies
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    1,552

    If the POE has no dissolved refrigerant, and the...

    If the POE has no dissolved refrigerant, and the container has a large opening, then that may be true. It takes a longer time than that to get a measurable increase in moisture.

    The outgassing...
  16. Replies
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    1,893

    This information is from Kluber in Germany, and...

    This information is from Kluber in Germany, and was for ammonia and mineral oils (the 3% moisture solubility gives it away). The CFC and HCFC refrigerants have different chemical reactions than...
  17. Replies
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    1,893

    You have got this exactly right. It's the high...

    You have got this exactly right. It's the high temperatures that cause the cap tube plugging problems. Dirty condensers are the main reason for the high T, but a bad fan motor will also cause major...
  18. Replies
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    2,023

    Ph-D, you are confusing the ability to do...

    Ph-D, you are confusing the ability to do something with the cost effectiveness to do it. You stated that air cannot be removed from refrigerant in the feild, where in fact it is done in many...
  19. Replies
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    2,023

    Ph-D, I'm sorry but I can't find much in your...

    Ph-D, I'm sorry but I can't find much in your post to agree with as far as the behavior of air - refrigerant mixtures. Nitrogen and refrigerants do not form any type of azeotrope, and are easily...
  20. Replies
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    2,023

    There was a recent ASHRAE Research project...

    There was a recent ASHRAE Research project (RP-1303) completed on the distribution of air between the liquid and vapor phases of refrigerants. R-134a was one of the refrigerants tested, and here are...
  21. Thread: Oil sample

    by RobY
    Replies
    3
    Views
    731

    The bottles aren't as important as the way you...

    The bottles aren't as important as the way you degass the refrigerant from the oil prior to shipping.

    You have to let most of the refrigerant vaporize out of the oil sample in order to prevent the...
  22. Replies
    8
    Views
    871

    I was on the ARTI MCLR (Materials Compatability...

    I was on the ARTI MCLR (Materials Compatability and Lubricants Research) advisory board when they did a lot of research in the past. ARTI got funding from the US DOE and contributions from the...
  23. Replies
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    1,840

    Definitely a typo by some City of Los Angeles...

    Definitely a typo by some City of Los Angeles employee. They are referring to DuPont HP-62 as R-404B -- HP-62 is definitely R-404A.

    The City of Los Angeles has some issues dealing with...
  24. Replies
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    1,840

    There is no such refrigerant as R-404B. Not as...

    There is no such refrigerant as R-404B. Not as an ASHRAE number, not in ARI 700, not in ISO 810, not anywhere, even in China. Believe me, I would know if there was an R-404B refrigerant anywhere on...
  25. Replies
    11
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    1,131

    The primary loop contains the refrigerant that is...

    The primary loop contains the refrigerant that is sent through the compressor.

    The primary loop loop absorbs or rejects heat to/from the secondary fluid (water, glycol, CO2, brine etc.). The...
  26. Replies
    7
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    1,840

    R-404B does not exist. Take another look at the...

    R-404B does not exist. Take another look at the condensing unit plate.

    Rob Yost
    National Refrigerants
  27. Replies
    8
    Views
    871

    The Herrick Labs at Purdue and the ACRC Lab at...

    The Herrick Labs at Purdue and the ACRC Lab at Illinois are the two most well known. Both are supported by major OEMs from all sectors of HVAC/R industry, and are doing cutting edge research and...
  28. Thread: R416 replaces R22

    by RobY
    Replies
    19
    Views
    3,057

    R-416A is an R-12 replacement. It should not...

    R-416A is an R-12 replacement. It should not work very well in a R-22 system.

    Rob Yost
    National Refrigerants
  29. Replies
    10
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    769

    This is why you should talk to the lab. I can...

    This is why you should talk to the lab. I can only see the chemical side of the oil condition, but you know the history of the system and what it is currently operating like. Had I known the...
  30. Replies
    10
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    769

    I wrote up my recommendations on the report I...

    I wrote up my recommendations on the report I gave him.

    I am concerned with the iron as it is slightly above normal. The acidity is actually 0.029 (not 1.5 - that is the ASTM D-1500 color), so it...
  31. Replies
    9
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    1,178

    I think you have a problem with the design of the...

    I think you have a problem with the design of the instrument. The cooling air the instrumnent takes in and sends over the electronics is making it too sensitive to the changes in ambient...
  32. Replies
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    1,178

    Being someone that bridges both fields (we have...

    Being someone that bridges both fields (we have GC/MS etc. in my lab) what the pharma lab is saying is that the way they use the instrument is not compatible with the environment they have. Who's...
  33. Replies
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    2,076

    I think there is alot of utility in doing oil...

    I think there is alot of utility in doing oil analysis, but I probably have a biased opinion ;-)

    The oil after copper plating occurrs actually has very little copper left. The symptoms of a...
  34. Thread: Oil Analysis

    by RobY
    Replies
    2
    Views
    791

    There is no public literature I am aware of on...

    There is no public literature I am aware of on interpreting analysis of refrigeration oil samples. There are documents on general oil analysis on several web sites of the labs that do industrial and...
  35. Replies
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    1,040

    Low pressure refrigerants (R-11, R-113 and R-123)...

    Low pressure refrigerants (R-11, R-113 and R-123) are not Hazmats, and can ship with no special paperwork.

    Medium and high pressure refrigerants are Hazmants due to the pressure being over 5 psig...
  36. Replies
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    1,509

    Sorry, I should not have copied the link from...

    Sorry, I should not have copied the link from another post as it truncated the text. Here is the link again:

    http://www.corrosionlab.com/papers/formicary1999/formicary_corrosion-1999paper.htm
  37. Replies
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    1,509

    That may not be a true statement on how long it...

    That may not be a true statement on how long it takes for for certain types of corrosion to make a hole in copper tubing.

    From:...
  38. Thread: poe and 404A

    by RobY
    Replies
    9
    Views
    1,317

    Sourdough bread could be a copper killer. Rob...

    Sourdough bread could be a copper killer.

    Rob Yost
    National Refrigerants
  39. Thread: poe and 404A

    by RobY
    Replies
    9
    Views
    1,317

    POE and copper don't have any corrosion problems...

    POE and copper don't have any corrosion problems on the inside of the system.

    There is a rare problem called formicary corrosion where pinholes will form in heat exchangers starting from from the...
  40. Replies
    6
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    5,929

    50 ppm moisture with POE is about as low as you...

    50 ppm moisture with POE is about as low as you should expect for virgin POE in drums. In bulk 6000 gallon trailers delivered direct from the POE manufacturer, it normally runs about 30 ppm. When...
  41. Replies
    3
    Views
    604

    If you were able to supply all the cold air you...

    If you were able to supply all the cold air you needed to keep the refrigerator cool by using ice, then the compressor would not run, and the freezer would warm up to close to room temperature.
    ...
  42. Replies
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    Views
    2,281

    A few things I'd like to hear your opinion on...

    A few things I'd like to hear your opinion on are:

    1. In your experience, generally speaking, what is the average time between oil changes that are actually necessary?

    That question can't be...
  43. Replies
    36
    Views
    2,281

    If you want to know when the oil needs changed,...

    If you want to know when the oil needs changed, do an oil analysis and get information on what shape the oil is actually in. If it is clean, leave it in - if not, get it out of there. I do a lot of...
  44. Replies
    4
    Views
    1,277

    You're correct in that R-22 has a different...

    You're correct in that R-22 has a different miscibility with mineral oil than the other oils you listed -- the least miscible oil is mineral oil. Both AB and POE are more miscible with R-22 than...
  45. Replies
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    2,348

    Some day the EPA will get around to updating...

    Some day the EPA will get around to updating their regulations. In the latest regulations (2006) on recovery and recycling equipment (40CFR82-- Subpart F_Recycling and Emissions Reduction), they now...
  46. Replies
    4
    Views
    720

    Most people take one sample from each rack for...

    Most people take one sample from each rack for oil testing. Finding the bad compressor that is causing the problem in the oil doesn't seem to be much of a problem. I've never had a customer with a...
  47. Thread: Compressor Oil

    by RobY
    Replies
    12
    Views
    1,652

    If it's any help, I cetainly agree. Especially...

    If it's any help, I cetainly agree. Especially with R-502.

    Rob Yost
    National Refrigerants
  48. Thread: oil question

    by RobY
    Replies
    12
    Views
    1,356

    The best 'general' guideline is to go with the...

    The best 'general' guideline is to go with the oil specified by the system and / or compressor manufacturer. They spent the time to find something that works. There are some general substitution...
  49. Thread: Compressor Burst

    by RobY
    Replies
    22
    Views
    2,608

    Yes. There is no possible chemical...

    Yes.



    There is no possible chemical reaction between the two gases.




    Lack of a regulator or a failed regulator that allowed full nitrogen pressure from the source to be delivered to the...
  50. Thread: oil question

    by RobY
    Replies
    12
    Views
    1,356

    There are a lot of screw compressors running with...

    There are a lot of screw compressors running with R-22 and POE today.

    There is one issue you need to consider with R-22 and POE. The solubility of R-22 in POE is much higher than R-22 into...
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