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Thread: Heatcraft walkin fridge. 404a/507

  1. #1
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    Heatcraft walkin fridge. 404a/507

    I'm about to leak check this unit. But I want to order refrigerant for it first but I'm unable to determine which refrigerant I should get. It says both 404a and 507. I could go give it a temp check but weather isn't cooperating. Is that the only way is to check it myself? Or does it matter. I'm assuming it does. Or does it?

  2. #2
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    It's probably 404......
    That is if it's more than a year old.
    But I'd be checking the txv to be sure
    You don't squat with your spurs on.
    And you NEVER put the torches away before pressure testing.

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  4. #3
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    Take both and return the one you don't need.

    PHM
    --------


    Quote Originally Posted by Joeshmowyaknow View Post
    I'm about to leak check this unit. But I want to order refrigerant for it first but I'm unable to determine which refrigerant I should get. It says both 404a and 507. I could go give it a temp check but weather isn't cooperating. Is that the only way is to check it myself? Or does it matter. I'm assuming it does. Or does it?
    PHM
    --------
    The conventional view serves to protect us from the painful job of Thinking

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  6. #4
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    That exactly what I ended up doing was checking the Txv. Super easy. Its 404a. Thank you!

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  8. #5
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    404A and 507A are so similar in composition it doesn't even matter which one you use.

    Sent from my SM-G965W using Tapatalk

  9. #6
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    Quote Originally Posted by Joeshmowyaknow View Post
    That exactly what I ended up doing was checking the Txv. Super easy. Its 404a. Thank you!
    Now clearly mark the proper refrigerant on the unit!

  10. #7
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    Aren't the new power elements marked with both refrigerants ?
    Is it possible the TXV is original ( before R507 ) yet the condensing unit has been upgraded ?
    Also it's best to not mix refrigerants as I get the impression you want to top off the charge.

  11. #8
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    Thread Starter
    Yes. Definitely

  12. #9
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    Balloyd just said it doesnt matter which one I used but I know your not supposed to mix them. The TV has been replaced before and it says 504 and 404. So I'm assuming its 404 in there and went ahead and got a tank. Thank you all

  13. #10
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    I'll assume he was under the impression you were starting fresh because I know he knows better than to mix gasses.
    There's a chance he may have superpowers I'm not aware of.
    😃

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