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  1. 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®...
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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.
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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...
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    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...
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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...
  6. Thread: Dallas

    by bunny
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    275

    For good Tex-Mex...Pappasito's

    For good Tex-Mex...Pappasito's
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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...
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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...
  9. It would be a tax deductible expense, just as...

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

    by bunny
    Replies
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    1,555

    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.
  11. Thread: 407A gas

    by bunny
    Replies
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    308

    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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    Obvious insight would be to look for the simple...

    Obvious insight would be to look for the simple causes to problems first.
  13. Thread: txv selection?

    by bunny
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    The only things required to select a TEV are SST,...

    The only things required to select a TEV are SST, liquid temperature and pressure drop across the TEV port.

    Ratio of nozzle size to TEV...not sure what you're meaning by that. The only factor the...
  14. Thread: txv selection?

    by bunny
    Replies
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    631

    Since it is near impossible to find a compressor...

    Since it is near impossible to find a compressor with the exact capacity of the evaporator, or in your case the exact capacity of the three evaporators piped to the compressor, it's best to size the...
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    Never a good idea to select a solenoid valve...

    Never a good idea to select a solenoid valve based on line size. The ME10 has a nominal capacity of 11 tons. A valve that is oversized may not have enough pressure drop through the port to allow th...
  16. Thread: txv selection?

    by bunny
    Replies
    15
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    631

    It's best not to generalize when selecting...

    It's best not to generalize when selecting components. Go to the TEV selection chart and select a valve based on your system conditions.

    The three things that affect TEV capacity ar Evap...
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    Nice touch with the video. Long story on the...

    Nice touch with the video.

    Long story on the move....come on by some day and I'll tell you all about it.
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    Glad the problems seemed to have been solved. ...

    Glad the problems seemed to have been solved.

    You mentioned that the original Turboshed separator used 2 Y-825 valves to reduce the oil pressure from the separator; one for the LT and one for the...
  19. You guys are brutal....but not without cause. ...

    You guys are brutal....but not without cause.

    :cheers:
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    That was for the ice rink.

    That was for the ice rink.
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    Enlighten us regarding residual refrigeration.

    Enlighten us regarding residual refrigeration.
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    Thanks for the explanation Kingvalve. That's a...

    Thanks for the explanation Kingvalve.

    That's a direct drive DC Synchronous motor...another evidence of the age of this machine.

    Carbondale was made my Worthington.
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    Parts changers assume. Technicians study out the...

    Parts changers assume. Technicians study out the problem and make an educated analysis based upon the facts, the system conditions, an understanding of refrigeration principles and an equal...
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    I think you just told us what your problem is. ...

    I think you just told us what your problem is.

    Now find out why you've got high superheat, and then you'll be on your way to a solution.
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    You say the TEV is working fine, but I've not...

    You say the TEV is working fine, but I've not seen any mention of superheat.

    While sludge in the evaporator certainly could be the cause, it is likely way down near the bottom of the list of...
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