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  1. #1
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    Walk in freezer R448A



    Received a call on this walk in freezer another company installed. System is remoted 2 floors above box. R448 refrigerant with -10 setpoint for Freezer. Looks like this unit has an MOP txv valve at 35 psig. Has a headmaster valve for 225 psig. Unit is actually at temp but looks as if in the colder mornings and nights it may be low on charge causing this iceing issue. I will have more info tomorrow. Just wanted some initial thoughts.

  2. #2
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    R-448A is a replacement for R-404A

    Treat it as the same.

    Is it low on charge? Clear the glass. 225# headmaster is fine!
    Are you aware how a headmaster works?

    That ice tells me its coming out of defrost a little early possibly a bad heater.

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  4. #3
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    Thread Starter
    Yes Iím familiar with headmasters, but looking at the ice formation around the txv and inlet of coil seems excessive like it was low on refrigerant enough to where the headmaster couldnít keep pressure up. I will know more tomorrow when I have another guy so I donít have to go back and forth 2 stories since the location is a pain.


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  5. #4
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    Quote Originally Posted by Bworth74 View Post
    Yes I’m familiar with headmasters, but looking at the ice formation around the txv and inlet of coil seems excessive like it was low on refrigerant enough to where the headmaster couldn’t keep pressure up. I will know more tomorrow when I have another guy so I don’t have to go back and forth 2 stories since the location is a pain.


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    Could be low
    Valve out of adjustment
    Garbage in the strainer (Hope not being hard soldered..Bring an extra valve just in case)
    Not properly charged for the headmaster .......now its cool at night.

  6. #5
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    Thread Starter
    Quote Originally Posted by pecmsg View Post
    Could be low
    Valve out of adjustment
    Garbage in the strainer (Hope not being hard soldered..Bring an extra valve just in case)
    Not properly charged for the headmaster .......now its cool at night.
    Yes it was installed in August in Texas so this is its first winter. Itís been getting high 20ís low 30ís overnight for a week or so now.


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  7. #6
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    Now the question is.........(If its low)

    Is there a leak or just not charged properly to begin with?

  8. #7
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    Thread Starter
    Quote Originally Posted by pecmsg View Post
    Now the question is.........(If its low)

    Is there a leak or just not charged properly to begin with?
    Lol, I was just thinking that. Guess a leak check is in place.


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  9. #8
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    I would get there early in the morning............
    If it only takes maybe a lb with a micro channel your probably good.

    If its actually short well have fun!

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  11. #9
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    Post pics of the condensing unit

  12. #10
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    Thread Starter
    Quote Originally Posted by pecmsg View Post
    Post pics of the condensing unit
    Ok I will do that tomorrow


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