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Thread: 404a Pressures

  1. #1
    Join Date
    Jun 2007
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    new jersey
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    404a Pressures

    The tag on my ice maker says high side pressure 500 and low-side pressure 250 is this correct ona commercial ice machine. Not familiar with 404A but that sounds high to me.

  2. #2
    That has to be MAX pressures before something bursts.

    500 PSIG on 404A = over 150F

    250 PSIG on 404A = 110 F

  3. #3
    Join Date
    Jan 2006
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    Near Atlanta, GA.
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    Those are test pressures, all that means is that the circuits are rated to handle that much pressure. Normal operating pressure of 404 is nowhere close to that.

  4. #4
    Join Date
    Jun 2007
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    820
    those are the max pressures rated for the evaporator and condensing coil, I pay attention to those when im using nitrogen for leak checks after i have installed a compressor or other.

  5. #5
    Join Date
    Jan 2006
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    Quote Originally Posted by couplux View Post
    The tag on my ice maker says high side pressure 500 and low-side pressure 250 is this correct ona commercial ice machine. Not familiar with 404A but that sounds high to me.
    Yup - a little high indeed. Water doesn't freeze well at +104F.

    Means you most likely will have a hand grenade sitting on top of a bin if the system pressures should ever go beyond those limits.

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