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Type: Posts; User: tvpbnl

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  1. Replies
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    From the field, on R422B, after a change out from...

    From the field, on R422B, after a change out from R-22 we did experience the problem with a high superheat as the old SEV-4 TEV's would not provide adequate flow yielding a 24 degree superheat, even...
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    We are going to changed out the expansion valves.

    We are going to changed out the expansion valves.
  3. Replies
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    Need bigger expansion valves with R-422b retrofit

    I got this directly from Parker/Sporlan:

    Tom,
    Thank you for the clarification. For R-422B with evaporator temperature of 40 F, condensing temp of 110 F, liquid temp 90 F, and a refrigerant...
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    I recently replaced the R-22 on a 10 ton...

    I recently replaced the R-22 on a 10 ton de-humidification unit with R-422b (NU-22). I did remove the mineral oil from both Copleweld 5 ton compressors, replaced with POE. I felt the NU-22 could...
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    Yes, POE is very hydroscopic. On this job the...

    Yes, POE is very hydroscopic. On this job the unit was open to the atmosphere. New dryers are installed. To minimize the POE coming in contact with moisture, evacuate your system after leak...
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    A TXV is useless on a cap-tube system. With a...

    A TXV is useless on a cap-tube system. With a TXV system, clear your sightglass and if no receiver, set the subcooling to 10-12 degrees under a moderate load (80 deg day).
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    A TXV has one purpose only. Utilizing the...

    A TXV has one purpose only. Utilizing the measured temperature and pressure on the evaporator outlet it adjusts the refrigerant flow through it to an adjustable superheat. To do this it must have a...
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    Clear the sg and then adjust sh maintaining a...

    Clear the sg and then adjust sh maintaining a clear sh throughout.
  9. Replies
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    BTW, Part of the updated refrigeration circuit...

    BTW,
    Part of the updated refrigeration circuit will include isolation valves on compressor inlet and discharge.
    I would like to attach a diagram of the refrigeration circuit (.pdf) but can't figure...
  10. Replies
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    The main reason for the conversion from R-22 was...

    The main reason for the conversion from R-22 was not noted. The system has incorporated outdoor coils for heat rejection. The unit also has water heat exchangers to permit heat rejection into the...
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    Yeah, mixing the two oils is not a good idea. ...

    Yeah, mixing the two oils is not a good idea. The compressors name plate indicate they were charged with 70 oz. of mineral oil. We plan to remove the compressors and measure what we take out of the...
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    R-22 equipment will be around for many years. ...

    R-22 equipment will be around for many years. Some of these units are disposable, however some are less easily replaceable. The unit I'm working on is 20 years old. It has a dual path 8 row...
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    R-22 is a lot more now. In 20 years (wishful...

    R-22 is a lot more now. In 20 years (wishful thinking), it wont be available at all.
  14. Replies
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    I'm doing a big job this month. It's a 10 ton...

    I'm doing a big job this month. It's a 10 ton Dectron (two 5 ton compressors) de-humidification unit. Though 20 years old the compressors are running great. It has great evaporator and reheat...
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    The word is schmuck, not smuck. Its Yiddish.

    The word is schmuck, not smuck. Its Yiddish.
  16. Thread: 407C Plus

    by tvpbnl
    Replies
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    2,862

    Yes

    Yes
  17. Thread: 407C Plus

    by tvpbnl
    Replies
    18
    Views
    2,862

    Does anyone know where to buy it. ABCO...

    Does anyone know where to buy it. ABCO Refrigeration in NY doesn't carry it.
  18. Thread: 407C Plus

    by tvpbnl
    Replies
    18
    Views
    2,862

    I was told that R-407C plus has some butane in it...

    I was told that R-407C plus has some butane in it to facilitate return of any residual mineral oil in the system after the compressor oil is swapped out for POE.
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    This is a 10 ton, 2 stage cooling and 2 stage...

    This is a 10 ton, 2 stage cooling and 2 stage electric heat system. The York wiring diagram shows a wired stat utilizing R,C,G,Y1,Y2,and the X terminal wired from the condensing unit to the stat. ...
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    What does the X termianl used for?

    New member here, Hello all!
    I'm working with a York YC120C 10 ton condensing unit. I have the instalation sheet and it show a connection from the X terminal on the units controller board to the...
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