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  1. #14
    Quote Originally Posted by powell View Post
    This compressor has 10 degrees of SH.
    These have 28*F superheat with a SST of -16*F. Normal.






  2. #15
    how much money do you make by adjusting a expansion valve?
    and why would it need adjustment after working for so long?
    (assuming this is not a new freezer)
    Again if it needs adjusting it needs to be replaced; unless your system is a lease
    unit where it would cost you money.
    thoughts?

  3. #16
    Join Date
    Mar 2008
    Location
    North Queensland, Australia
    Posts
    1,050
    Quote Originally Posted by ttriffic02 View Post
    how much money do you make by adjusting a expansion valve?
    and why would it need adjustment after working for so long?
    (assuming this is not a new freezer)
    Again if it needs adjusting it needs to be replaced; unless your system is a lease
    unit where it would cost you money.
    thoughts?
    Unless someone else has stuffed with it before you.
    Unless it was never set up properly in the first place.
    Mistakes are a part of being human. Appreciate your mistakes for what they are: precious life lessons that can only be learned the hard way. Unless it's a fatal mistake, which, at least, others can learn from. Al Franken, "Oh, the Things I Know", 2002

  4. #17
    Join Date
    Nov 2005
    Posts
    385
    i agree with slatts on this one. and also sometimes the needles in the valve get worn. so you'd adjust it to get proper superheat. i have been to alot of calls where someone has opened up the valve to much thinking allowing more refrigerant to the coil will make it run colder. that ain't true. too much refrigerant in the coil can't absorb all that heat so it will run warmer. i have closed more valves then opened in my short career. and down the road if you keep changing parts then getting called back to the same problem time after time customer is goin to use someone else. adjusting a txv from time to time just might make that account of yours last longer that it.

  5. #18
    Join Date
    Jun 2005
    Location
    Las Vegas NV
    Posts
    1,139
    Quote Originally Posted by smilies View Post
    These have 28*F superheat with a SST of -16*F. Normal.
    Cool pics! No pun intended.

    Powell

  6. #19
    Join Date
    Sep 2005
    Location
    florida
    Posts
    5,495
    Quote Originally Posted by -frozen-ocean- View Post
    i agree with slatts on this one. and also sometimes the needles in the valve get worn. so you'd adjust it to get proper superheat. i have been to alot of calls where someone has opened up the valve to much thinking allowing more refrigerant to the coil will make it run colder. that ain't true. too much refrigerant in the coil can't absorb all that heat so it will run warmer. i have closed more valves then opened in my short career. and down the road if you keep changing parts then getting called back to the same problem time after time customer is goin to use someone else. adjusting a txv from time to time just might make that account of yours last longer that it.
    Well said frozen.
    I love the smell of phosgene first thing in the morning:

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  7. #20
    Join Date
    Jul 2000
    Location
    Guayaquil EC
    Posts
    10,081

    Yup...

    Quote Originally Posted by -frozen-ocean- View Post
    ...and down the road if you keep changing parts then getting called back to the same problem time after time customer is goin to use someone else. adjusting a txv from time to time just might make that account of yours last longer that it.
    That's precisely why I'm working for a lot of my older cutomer's kids these days.

  8. #21
    Given the prameters of the post, frozen starved coil freezer not working
    mechanic has cranked the valve trying to do whatever he thought was correct yet the unit shown in the picture still is starved It is correct to change out the valve.
    I also believe if a costomer calls you for a freezer call (not working) and you surmize like the mechanic in the post the txv is causing the problem and again given the picture of the coil in question adjustment is not the answer.
    A new valve is.

    I'd like to know if ice is forming on the inside if the valve stem cap pushing down on the stem, I have had this problem with one manifacturer of txv
    it gets ice on the inside of the cap and pushes on the adjustment stem acting like a partial restriction with a goodly pressure drop across the coil and a small freon leak at the stem itself. After the first occurance the stem leaks and again pressure builds under the cap causing the valve to close artifically.
    Oh I still belive if a txv nees adjustment (the cause of the service call) it will be replaced
    This has worked for me for 23 years now, I see no cause for worry
    Plus it will fix the problem (remember we are talking about a tweek of a valve causing the call) Sell the valve get the service call and the customer will be happy in the end as you fixed the problem and fixed it in his mind by changing a defective part. Opposed to making several adjustments eating a ****load of your time collecting only for labor and the customer wondering if you really did fix it or did you just futz around with it to get it going again.
    That is just the way I see it and it has worked well for me adn for just selling parts that is not what we are talking about here it is the TXV adjust or not as to the picture in the post and common sense of business. just my two cents worth

  9. #22
    Join Date
    Nov 2007
    Posts
    162

    Confused

    ttriffic02,
    Still curious on how you test a valve plate by feeling the head as you explained in a previous post (#4 of your checklist)?

  10. #23
    Join Date
    Sep 2005
    Location
    florida
    Posts
    5,495
    Quote Originally Posted by nwrscold View Post
    ttriffic02,
    Still curious on how you test a valve plate by feeling the head as you explained in a previous post (#4 of your checklist)?

    check the heads on the compressor by touching them, if one is cooler or cold a valve plate is leaking by or broken all together. So many things so few words.

    Could you please school me on this method of testing a valve plate?In my 20
    + year's I have never herd of that. So nwrscold we think alike.I would also
    like to hear the awnser to that one.
    I love the smell of phosgene first thing in the morning:

    To apply for professional membership click here


    Educational forums are open.

    If you would like to submit a link or an article or other related info to the EF. click here

  11. #24
    Join Date
    Jun 2008
    Posts
    63
    To give an update TXVs were changed out on 2 of the 3 coils in question there is a third unit to be done. Suction pressure at -20f and 10f superheat. These are working beautiful!!

  12. #25
    Join Date
    Mar 2008
    Location
    North Queensland, Australia
    Posts
    1,050
    Quote Originally Posted by Jangles View Post
    To give an update TXVs were changed out on 2 of the 3 coils in question there is a third unit to be done. Suction pressure at -20f and 10f superheat. These are working beautiful!!
    I do love a happy ending
    Mistakes are a part of being human. Appreciate your mistakes for what they are: precious life lessons that can only be learned the hard way. Unless it's a fatal mistake, which, at least, others can learn from. Al Franken, "Oh, the Things I Know", 2002

  13. #26
    Quote Originally Posted by Jangles View Post
    To give an update TXVs were changed out on 2 of the 3 coils in question there is a third unit to be done. Suction pressure at -20f and 10f superheat. These are working beautiful!!
    Good for you. As for the third one which through a rod. You got a handle on that?
    FEN

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