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Aloha, we have a Taylor #794 batch freezer - what refrigerant should we use (data panel has been removed, but we have been told it was manufactured before 1995) ? Mahalo

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  • Paul B Sep 29, 2010

    we've been told that it should be R-502 or R-404A - ?

  • Paul B Sep 29, 2010

    the spec sheet for the 2010 model of #794 states: "Refrigeration System
    Two, 9,500 BTU/hr. R404A.
    Separate Hopper Refrigeration (SHR), One, 400 BTU/hr. R134a"

    so, the cylinder refrig sys requires R404A - I only have R-502, can I use the 502 if we vacuum out the system completely

  • Paul B Sep 29, 2010

    mahalo (thanks) and just to help me understand, what is the primary difference(s) between 404A

  • Paul B Sep 29, 2010

    sorry, I forgot to ask you... what should the "normal" pressure be for 404A/ 502 - I've heard between 100-140??

  • Paul B Sep 29, 2010

    OK, thanks for all your help - aloha and mahalo nui loa (thanks very much)

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  • 1,796 Answers

Then, the refrigerant is R-22 and the type of oil is mineral.

Posted on Sep 29, 2010

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  • Rene J Solis Sep 29, 2010

    Click on the following link to get the specs of the whole unit. The Refrigerant gas is R134a.






    Good day!!

  • Rene J Solis Sep 29, 2010


    I meant the Hopper is R134a and the actual Cooling system has two compressors that use R404a refrigerant.



    So your system do use R404a and R134a refrigerant.



    Refrigeration System

    Two, 9,500 BTU/hr. R404A.



    Separate Hopper Refrigeration (SHR), One, 400 BTU/hr. R134a.

    (BTUs may vary depending on compressor used.)




  • Rene J Solis Sep 29, 2010

    The two are compatible and if you have no other choice.......

  • Rene J Solis Sep 29, 2010

    I am working on that, give me a few

  • Rene J Solis Sep 29, 2010

    Basically, the R502 is a blend of R-22 and R115 and is not as Eco Friendly as the R404a which is 95% less damaging to the Ozone Layer. Both systems are for low temperature compression refrigerants. To be on the safe side, I would use the R404a and not risk system corrosion in the system and eventual compressor failure. If it is an old machine and you just need it to work for a couple of yrs. then you know what to do. Good Luck!1

    Here are the descriptions of the two types of refrigerant:

    R502 refrigerant. Azeotrope blend of R22 and R115 refrigerants. R22 mass proportion constitutes 48,8%, and R115 - 51,2%. It is related to CFC group, has the following ecological characteristics: ODP = 0,33; GWP = 4300. Non-explosive, low-toxic and chemically inert to metals. R502 resolvability in oils, heat transfer coefficient during boiling and condensation are close to the corresponding values for R22. Peculiar feature: R502 is poorly soluble in water. Tolerance concentration of R502 in the air constitutes 3000 mg/m3. Its volumetric refrigerating effect is higher and discharge temperature is approximately 20 oC lower that those of R22, which positively manifests itself on the temperature of electric motor winding during operation of hermetic refrigeration compressor. R502 refrigerant was used in low-temperature compression refrigerating facilities.


    Until concerns about depletion of the ozone layer arose in the 1980s, the most widely used refrigerants were the halomethanes R-12 and R-22, with R-12 being more common in automotive air conditioning and small refrigerators, and R-22 being used for residential and light commercial air conditioning, refrigerators, and freezers. Some very early systems used R-11 because its relatively high boiling point allows low-pressure systems to be constructed, reducing the mechanical strength required for components. New production of R-12 ceased in the United States in 1995, and R-22 is to be phased out by 2020. R-134a and certain blends are now replacing chlorinated compounds. One popular 50/50 blend of R-32 and R-125 now being increasingly substituted for R-22 is R-410A, often marketed under the trade name Puron. Another popular blend of R-32, R-125, and R-134a with a higher critical temperature, and lower GWP than R-410A is R-407C. While the R-22 and other ozone depleting refrigerants are being phased out, they still have value and can be easily sold

  • Rene J Solis Sep 29, 2010

    Click here for a pressure - temp chart


    http://www.chillers.com/PT%20charts%20fo...

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