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Thread: 404a walk in

  1. #1
    Join Date
    Feb 2008
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    ga
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    404a walk in

    Has any one been installing walk in coolers with 404a? Had any problems ? I have built 3 systems so far with out any problems but the oldest has been 6 months. I was concern with 22 going out I would give it a shot . Supply house gave may a strange look when ordered equiptment.

  2. #2
    Join Date
    Jul 2008
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    NEW JERSEY
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    40
    Never had any issues with R-404a equiptment be it coolers, freezers, or ice machines. Just make sure the piping is correctly dehydrated caus' POE don't like moisture.

  3. #3
    Join Date
    Sep 2008
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    Cedar Rapids, IA
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    Walmart switched to 404a several years ago for both medium temp and low temp. Most WIC we do these days are 404a.

  4. #4
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    NW AR
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    404a....Good stuff.

  5. #5
    Join Date
    Sep 2005
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    florida
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    All of my new markets that I service are 404A med and low temp work's
    great.
    I love the smell of phosgene first thing in the morning:

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  6. #6
    Join Date
    May 2008
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    S.E.Virginia
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    Just about all the low temp. and some med. temp. boxes I deal with are 404. No problems. Charge as liquid. Better oil return than 507.

  7. #7
    Join Date
    Jun 2006
    Location
    Omaha, Nebraska
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    869
    Quote Originally Posted by kerreckt View Post
    Just about all the low temp. and some med. temp. boxes I deal with are 404. No problems. Charge as liquid. Better oil return than 507.
    Charge as liquid- what if you get a leak on the vapor side? Is this one of those cocktails that leaks out in different proportions?

    The previous tech on the account I took over a couple months ago just added 400 lbs. of 404A to the rack in July. I don't think he found the leak so this will probably come back to haunt me. I was just wondering if I might end up with impure 404A in the system.

  8. #8
    Join Date
    Jan 2006
    Location
    Near Atlanta, GA.
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    404 works fine on coolers and freezers so long as the equipment selection is correct and the installation is done properly. Do your homework on POE oil and use proper piping practices to get good oil return.

    Fractionation has not been near the problem it was expected to be. The only problems we've seen has been from multiple leak/recharges that occur on a vapor portion of the system during off cycle. Don't worry about it.

  9. #9
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    Sep 2008
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    Cedar Rapids, IA
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    Quote Originally Posted by k_fridge View Post
    404 works fine on coolers and freezers so long as the equipment selection is correct and the installation is done properly. Do your homework on POE oil and use proper piping practices to get good oil return.

    Fractionation has not been near the problem it was expected to be. The only problems we've seen has been from multiple leak/recharges that occur on a vapor portion of the system during off cycle. Don't worry about it.
    I remember reading somewhere that you could lose 50% of the charge as vapor and top off and it would skew the mixture by only a small amount, something like 2-3%. It was felt that that small of a difference would not cause an operational problem. R507 is even less sensitive. R404a has the same two components as are in R507 only in different proportions and it has a small amount of R134a mixed in as well.

  10. #10
    Join Date
    Mar 2007
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    NW AR
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    Fractionation is not that big of a problem on azeotropic blends, like 404A.

    If the refer has a "B" desination like 414b then fractionation is more of a problem.

  11. #11
    Join Date
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    NW AR
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    404A is an azeotrope.

    An azeotrope is a mixture of two or more pure compounds (chemicals) in such a ratio that its composition cannot be changed by simple distillation. This is because when an azeotrope is boiled, the resulting vapor has the same ratio of constituents as the original mixture of liquids. As the composition is unchanged by boiling, azeotropes are also known as constant boiling mixtures.

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