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  1. #1
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    Red face R404a to R407a Retrofit



    Hi All,

    Due to the ever increasing price and the fact 404a is being phased out I've been tasked with coming up with a plan to change it to 407a. The system in question contains around 600kg and is a multipack system, which operates at around 8 degrees Celsius currently and will do for the foreseeable future.

    In regards to the things being considered I've listed below things that may need changing in order to accommodate this change:
    - TEV's
    - Pressure Switches
    - PRV's
    - Drier Filters
    - Schraeder Valves
    - Compressor oil change

    If I've missed anything please feel free to tell me, any advice would be much appreciated.

    Jurgen



  2. #2
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    Re: R404a to R407a Retrofit

    Is R407a the best choice ?

    Some alternatives maybe... http://bit.ly/2eswIeT
    Brian, retired in Devon.

  3. #3
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    Re: R404a to R407a Retrofit

    Hi Jurgen
    You've probably done this now, but I would have used R442a...
    Unlike most of the other replacements, this is more efficient than R404a
    https://www.boconline.co.uk/internet...9184.pdf?v=1.0

  4. #4
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    hookster is offline Veteran Poster I am starting to push the Mods: of RE
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    Re: R404a to R407a Retrofit

    I have been using R448A and R449A for retrofitting from R404a and this has been the far simplest change out process with these two refrigerants.

    Always change the oil!
    I love the smell of Ammonia in the morning!

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