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Thread: Walk in freezer

  1. #1
    Join Date
    Aug 2010
    Location
    Riverside California
    Posts
    24

    Unhappy Walk in freezer

    i am working on walking freezer
    which was not running
    faulty starting component
    ran unit it trip on low pressure switch.
    frost on txv and distributor tubing
    h.p 350 l.p 25# amb. temp 95*-100
    l.p rises when not operating. l.l solenoid faulty
    Replace l.l valve and filter drier . Recover (404a) freon
    flush system after disconnecting txv w/dry nitrogen lots of oil came out of distributor tubing pull vacuum, break vacuum w/dry nitrogen 5# and again pull vacuum for 4 hrs. charged unit h.p 225 l.p25# box temp after 1 hr 53* frost still building on txv outlet and distributor. i am suspecting system is contaminated any idea what is going on my next step is to replace txv valve before doing that i wanna mke sure syetem is clean. is ther a way to check the system w/out opening.
    any assistance or advice will be greatly appreciated

  2. #2
    Join Date
    Dec 2000
    Location
    phoenix, arizona
    Posts
    1,117
    charged unit h.p 225 l.p25# box temp after 1 hr 53* frost still building on txv outlet and distributor. i am suspecting system is contaminated any idea what is going on my next step is to replace txv valve before doing that i wanna mke sure syetem is clean. is ther a way to check the system
    w/out opening.

    With the number you show, it looked pretty good to me, maybe a little under charge. Frosting is normal.

    What is your sub cooling? ________ super heat? _________
    Decide what you want, decide what you are willing to exchange for it. Establish your priorities and go to work." H.L. Hunt

    "In order that people may be happy in their work, these three things are needed: They must be fit for it. They must not do too much of it. And they must have a sense of success in it." John uskin

  3. #3
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,425
    Why do you think it's contaminated when you tell us you pulled the charge and vacuumed everything? Assuming you charged as a liquid.... Without any temps other than your pressures it would seem to me you have a restriction. Would be helpful to have a superheat number to know what the expansion valve is doing. If you have a receiver then I wouldn't worry about subcooling. Superheat would be anywhere from 6-10 for my taste but maintaining your 20 degree compressor superheat. Taking a superheat reading I bet will point you the right direction.

  4. #4
    Join Date
    Sep 2007
    Location
    NH
    Posts
    1,110
    Not a lot to go on here, but I would pump it down and check and clean the tx screen... Could have a weak power head too.

  5. #5
    Join Date
    Aug 2010
    Location
    Riverside California
    Posts
    24
    Thanks all of you guys for advice iam going there today I wil remember 3. things for sure They must be fit for it. They must not do too much of it. And they must have a sense of success in it

  6. #6
    Join Date
    Oct 2011
    Location
    Chicagoland Area
    Posts
    4,306
    So the cooler was walking before and now it's the freezer? Better catch them before they walk too far. I have read your posts. It's time to call a qualified tech and stop asking for free advice. If you really are a tech, you need some serious education. It seems all you do is change parts hoping for a fix. Pick up the Fundamentals of Refrigeration, which is standard text at the trade schools, and don't put it down until you learn something.
    Officially, Down for the count

    YOU HAVE TO GET OFF YOUR ASS TO GET ON YOUR FEET

    It was working when I left...
    Liberalism-Ideas so good they mandate them

  7. #7
    Join Date
    Feb 2008
    Location
    California
    Posts
    2,057
    Your walking freezer is building frost on the TXV?

    OH NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO!

  8. #8
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,425
    Quote Originally Posted by Phase Loss View Post
    Your walking freezer is building frost on the TXV?

    OH NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO!
    Where's the monty python "run away!!!!" picture at?!

  9. #9
    Join Date
    Jul 2012
    Location
    North west Arkansas
    Posts
    84
    Quote Originally Posted by ryan1088 View Post
    Where's the monty python "run away!!!!" picture at?!
    That's only if they "fart in your general direction"...

  10. #10
    Join Date
    Feb 2008
    Location
    California
    Posts
    2,057
    It's already walking, farting can't be too far away!

  11. #11
    Join Date
    May 2006
    Location
    Kennett, Missouri
    Posts
    997
    Quote Originally Posted by Qamar View Post
    Thanks all of you guys for advice iam going there today I wil remember 3. things for sure They must be fit for it. They must not do too much of it. And they must have a sense of success in it




  12. #12
    Join Date
    Aug 2010
    Location
    Riverside California
    Posts
    24
    Thanx for your advice

  13. #13
    Join Date
    Aug 2010
    Location
    Riverside California
    Posts
    24
    check txv screen it's clean turn off avap.fan to see flow of refrigerant , frost was building all across evap coil follow sporlan instructions to adjust SH left unit running all night chk next morning box temp went down to 20*F. 1/4 turn stem to chk if it goes down further. I am debating if there is a mismatch. I have collected all the info.will do a serious anylisis.

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