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  1. #1
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    404 flashing b4 TXV


    cornellius xrc1444 machine, machine has run fine for three years, low production lately, quick inspection found pressure switch at condenser was bad, (would not close swith on pressure rise and stay out), replaced, ran fine for two weeks and now customer states low production, checked condenser fan and running fine, line set very hot and no "heat" pulling through condenser. i am thinking the 404 is flashing before txv, but why and why no heat off condenser?????
    thanks in advance



  2. #2
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    Re: 404 flashing b4 TXV

    sounds to me like your compressor is inefficient/damaged reeds.
    mmm to beer or not to beer...........lets drink breakfast

  3. #3
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    Re: 404 flashing b4 TXV

    Check subcooling before TXV. If you dont have 2K or more than it is possibly flashing (2K is minimum required subcooling if you don't have liquid receiver).
    Check proper fan rotation direction and RPM. Check and clean condenser.

    We also need more data to be able to help you in meaningful way.

    http://www.refrigeration-engineer.co...12&postcount=5



    Last edited by nike123; 08-10-2009 at 08:16 AM.
    Now, when I am officialy citizen off EU, I am looking for decent job! For any job offer please check my profile!

  4. #4
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    Re: 404 flashing b4 TXV

    i have no temp diff across txv's and the pressures at remote cond are 175/175. the pressures at machine are 40/180. when the machine starts freeze cycle, the pressures are 60 and 260, after 5 minutes the flashing begins ( i am assuming this is what is happening) and pressures are back to the 40/180. Could the vales be going out in this hrermetic??? would it run for a few mins and then go wacko??

  5. #5
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    Re: 404 flashing b4 TXV

    Quote Originally Posted by 1coolguy View Post
    i have no temp diff across txv's and the pressures at remote cond are 175/175. the pressures at machine are 40/180. when the machine starts freeze cycle, the pressures are 60 and 260, after 5 minutes the flashing begins ( i am assuming this is what is happening) and pressures are back to the 40/180. Could the vales be going out in this hrermetic??? would it run for a few mins and then go wacko??
    Check temperature difference at inlet and outlet of Filter-Dryer and change it if difference is more than 0,5K (1°F).
    What about other data like subcooling etc...
    Last edited by nike123; 09-10-2009 at 05:28 PM.
    Now, when I am officialy citizen off EU, I am looking for decent job! For any job offer please check my profile!

  6. #6
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    Re: 404 flashing b4 TXV

    no temp diff at drier, subcool is 60*.

  7. #7
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    Re: 404 flashing b4 TXV

    btw.. nike123, i do have a receiver, if that helps

  8. #8
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    Re: 404 flashing b4 TXV

    more info.....
    pressures-15/125
    before txv temp. 96*
    after txv 77*
    77*entrering plates, 57*out.
    suction temp at comp. 73*
    subcool is 30*, temps are raising longer machine runs. acts like it is low on charge, already 6oz. over weigh in charge.

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