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  1. #27
    Join Date
    Nov 2005
    so cal
    didn't even cross my mind...stay warm

  2. #28
    Join Date
    Dec 2006
    In a Mess


    I'm in the process of figuring out this system even thjough I hardly even work on any anymore, I actually went to a cal last saturday before reading or seeing this thread and I copied down the 3 valve model numbers

    reciever inlet sporlan OLDR-15
    Reciever bypass sporlan E3452110
    reciever pressureizer sporlan special pressure reg valve, CROT U -6 80/200

    i gotta look in to it and hopefully i can figure it out in my own way

    Sig removed by mod. G-Rated site

  3. #29

    tyler rack

    I work for a company that is putting in a supermarket for a customer that has bought used hill/phoenix cases and a tyler (envireguard) low temp. rack 1991 model# P9OL-31 SERIAL # w628933 And a warren/sheer medium temp. rack. I basically need to answer three questions. 1.) How do I determine the total heat of rejection of the rack and the condenser? I want to make sure that the codenser is large enough for the rack prior to pipping it in. 2.) Should I replace the old DDR valve with a new LDR valve? And if so what is the difference between a OLDR and a LDR valve? And should it be energized or deenergized to create the 20 psig differental to allow the condensed hot gas back to the rack through the liquid line? 3.) Is it a major job to take out the old A78 paragon timer modules and replace it with a cpc controller?



  4. #30

  5. #31
    I am working on a Tyler enviroguard 3, my head pressure is erratic causing the spr solenoid to stay open and dump all the gas into the surge tank "receiver". I've changed the discharge transducer, but controller still shows on average 60lbs higher then my gauges show. Before I started on this, somebody had recovered all the freon because they thought they had air in ten system. I have to close spr ball valve to keep system running normal. Any advice?

  6. #32
    Join Date
    Dec 2006
    In a Mess
    I would fix your PLC issue,start there, if its 60psi higher than gague you are going to have to fix that

    and you better check your compressor high pressure safeties!
    Sig removed by mod. G-Rated site

  7. #33
    Join Date
    May 2010
    Quote Originally Posted by Marc O'Brien View Post
    I did post a reply to the other thread you started on this topic.

    About 10 years ago now I did one of my first Flash Presentations which just happened to be on the Enviroguard system. For about a year I was commissioning them at the rate of about 1 a week.

    Have a look at this link...

    Enviroguard Presentation

    The presentation even has setting instructions for the SPR Valve.

    Remember, very importantly, these systems do not have subcool. They should never have subcool. the "quick diagram" states subcooled liquid but this is in reality not true.

    Since these system float the head they require more refrigerant than a standard system - hense the side vessel.

    Here is a copy and paste of my reply to the other thread you started...

    The idea here is to float the head pressure and so drop the annual energy costs by up to 40% compared to a fixed head pressure system

    This system is usually coupled with electric defrost because sometimes the head pressure can get so low the liquid line freezes - this means low heat-flux from the hot (or Kool) gas.

    There is no subcooling designed into the system. Unless you use a liquid pump (Hysave LPA) you have to locate these systems a good few meters above all the evaporators and you most certainly cannot run your liquid lines up or even any significant horizontal distance before going down. Liquid lines generally must go down about 5m before going horizontal.

    During summer and high load conditions there is greater flash gas in the evaps and so less liquid there and the warmer liquid in the liquid line expands and the liquid volumes collecting in the condenser tubes reduces and so the side vessel is used to store the excess liquid not needed for summer. During winter the velocity through the condenser slows and so liquid collects there, the cooler liquid in the liquid line is more dense (less voluminous) and there is less flash gas in the evaporator causing liquid levels there to increase which all leads to the need for greater system refrigerant charge in winter which comes from the side vessel.

    There is a tube running from the SPR valve to a larger tube, normally with a sight glass, that is charged with the same refrigerant as the system, that sits outside the unit in the air-on but out of the sunshine. The SPR valve compares head pressure to ambient temperature via this tube system and if head pressure rises say 14K above ambient then it is assumed that there is too much liquid in the condenser, raising head pressure unecessarily causing greater power consumption, also starting to cause unwanted subcooling, and so the SPR valve opens to drain liquid from the condenser and into the side vessel.

    A small continuous draining from the side vessel to the system suction via a discharge desuperheating heatexchanger takes place to ensure the system has more liquid available anytime as conditions change during the day and seasons.

    One of the other advantages of this system is that it tells you very early on if you have a refrigerant leak. Case temperatures rise very soon after a small amount of refrigerant is lost.
    Almost a 6 year bump

    Any chance anyone has the presentation?

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