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  1. Replies
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    430

    Also, one single compressor units with long...

    Also, one single compressor units with long piping runs, installing the SV at the receiver outlet might necessitate a larger receiver to prevent high pressure during pump down (if the standard size...
  2. Thread: subcooling

    by bunny
    Replies
    74
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    2,643

    Once the liquid entering the TEV goes through the...

    Once the liquid entering the TEV goes through the expansion process, the exiting liquid/vapor mixture is at the SST corresponding to the evaporator pressure. At this point it's immaterial that the...
  3. Thread: subcooling

    by bunny
    Replies
    74
    Views
    2,643

    Having worked for a manufacturer for nearly 25...

    Having worked for a manufacturer for nearly 25 years I get the concept of occasionally having to make concessions in design to be more competitive in the marketplace. Nothing new there.

    I do take...
  4. Thread: subcooling

    by bunny
    Replies
    74
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    2,643

    A typical supermarket might employ a mechanical...

    A typical supermarket might employ a mechanical subcooler on the Low Temperature rack. Rather than a 90F liquid being supplied to the TEVs, it might now be 50F.

    What does this accomplish? The TEV...
  5. Thread: subcooling

    by bunny
    Replies
    74
    Views
    2,643

    .

    .
  6. Thread: subcooling

    by bunny
    Replies
    74
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    2,643

    I'm going to disagree with this statement....or...

    I'm going to disagree with this statement....or at least offer an interpretation of what you might be saying.

    IT might be splitting hairs, but the heat contained in the liquid refrigerant does not...
  7. Thread: subcooling

    by bunny
    Replies
    74
    Views
    2,643

    The liquid will never be above the condensing...

    The liquid will never be above the condensing temperature. First, you cannot raise a liquid above its saturation (boiling) temperature...it's physically impossible. Secondly, as the liquid travels...
  8. Replies
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    Incidentally, the R-12 valve with a 1 ton...

    Incidentally, the R-12 valve with a 1 ton capacity will be approximately 1.2 tons with R-134A, and approximately 1.3 tons with MP39.

    Not a huge deal on smaller systems. At one time there were a...
  9. Thread: Cleaning out TEV

    by bunny
    Replies
    5
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    437

    Agree that on smaller TEVs it's probably more...

    Agree that on smaller TEVs it's probably more cost effective to replace. When doing so I highly recommend disassembling the old TEV so as to determine what was strong with it.

    If its a...
  10. Thread: Cleaning out TEV

    by bunny
    Replies
    5
    Views
    437

    Any TEV that can be dissembled can be cleaned...

    Any TEV that can be dissembled can be cleaned out.

    Use a Virginia or Calgon solvent to clean all of the parts and the interior of the body, then blow it out with CO2 and reassemble.
  11. Replies
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    One of the shortfalls with mechanical HGB in a...

    One of the shortfalls with mechanical HGB in a comfort cooling application is that you're trying to prevent the evaporator (or chiller barrel) from operating at a temperature that would cause freeze...
  12. Thread: "Drying" a drier

    by bunny
    Replies
    21
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    1,071

    The standard core has a higher acid capacity then...

    The standard core has a higher acid capacity then the HH core...but not by much.

    The HH core was developed to remove wax like contaminants (not parifin) in LT R-22 and R-502 systems. It's not an...
  13. Thread: "Drying" a drier

    by bunny
    Replies
    21
    Views
    1,071

    The process of heating dessicant as a means of...

    The process of heating dessicant as a means of driving moisture out of it is called reactivation.

    Having worked at the valve company in question.....reactivating cores is possible....but not...
  14. Replies
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    Pilot operated solenoid valves require a minimum...

    Pilot operated solenoid valves require a minimum amount of pressure drop to close. If they're oversized, there might not be enough pressure drop to move the disc when the coil is de-energized.

    An...
  15. Excerpt from DoPont "Retrofit Guidelines for Suva...

    Excerpt from DoPont "Retrofit Guidelines for Suva Refrigerants"

    R-12, R-22 and Suva® 134a are all single component refrigerants with no temperature “glide” in the evaporator or condenser. Suva®...
  16. Replies
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    Ammonia systems are interesting....but few...

    Ammonia systems are interesting....but few compared to non-ammonia systems.

    As others have stated, plan on a lot of travel.

    Or find a company that does both.
  17. Replies
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    Hopefully you understand that cap tubes or...

    Hopefully you understand that cap tubes or flow-raters don't offer the performance a TEV does.

    They're sized to operate at design superheat at a specific design condition. Anything outside of the...
  18. Replies
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    532

    Actually, many OEMs want their TEVs factory set...

    Actually, many OEMs want their TEVs factory set according to their specification, but also don't want technicians to have the ability to change that factory adjustment.

    This valve satisfies both...
  19. Replies
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    The O valve is a balanced ported valve and can...

    The O valve is a balanced ported valve and can throttle down to approximately 25% of its nominal capacity.

    That being said, it's still a curious application....probably budget took precedence over...
  20. Thread: Dallas

    by bunny
    Replies
    2
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    348

    For good Tex-Mex...Pappasito's

    For good Tex-Mex...Pappasito's
  21. Replies
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    2-3 is pretty low considering there is some...

    2-3 is pretty low considering there is some margin of error in the gauges and temperature meter. Plus, the SH you're reading on the outside of the pipe is not the true SH of the refrigerant inside...
  22. Replies
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    I Worked for " the" valve company, and never...

    I Worked for " the" valve company, and never heard anyone say to size the TEV for 65% of rated capacity.

    Many of the commercial R410-A systems with micro channel condensers are using TEVs with...
  23. It would be a tax deductible expense, just as...

    It would be a tax deductible expense, just as tools are.
  24. Thread: Why.....

    by bunny
    Replies
    24
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    1,779

    That's easy....they were either left over from a...

    That's easy....they were either left over from a commercial job or bought at a salvage sale.
  25. Thread: 407A gas

    by bunny
    Replies
    2
    Views
    361

    R-407A is becoming quite popular here in the US....

    R-407A is becoming quite popular here in the US. I'd say 40%+ of all new equipment being built for supermarkets is using 407A...and probably 90% of the R-22 conversions are going with R-407A. There...
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