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  1. #14
    Join Date
    Jul 2005
    Location
    Phoenix, AZ
    Posts
    266
    What is the best way to clean a TXV screen noe that it was mentioned. Just curious.

    Sent from my DROID RAZR using Tapatalk 2

  2. #15
    Join Date
    Sep 2002
    Posts
    12,275
    I like to take them out and blast spray brake cleaner through them backwards. Although, unless there is no LL drier in the system, it very seldom ever needs doing.

    PHM
    ------



    Quote Originally Posted by phxhvac View Post
    What is the best way to clean a TXV screen noe that it was mentioned. Just curious.

    Sent from my DROID RAZR using Tapatalk 2
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  3. #16
    Join Date
    Jun 2013
    Location
    Mechanicsburg, Pa
    Posts
    31
    I've seen them where they get black gup buildup on the internal parts not allowing it to move freely. That is even with a liquid drier on. You never know what all was done to the system in the past work wise from other techs or if a burnout ever happen. holding the bulb and trying to adjust it first is something I would try first too. check liquid drier for blockage. If the txv is flared in like some cooler/freezers are, I usually just change it with complete new. when a power head fails usually it is drastic.

  4. #17
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,556
    Quote Originally Posted by Tommy knocker View Post
    I would actually start cheeper. Try to adjust TEV and see if it will or pull the bulb and hold it in your hand. I'd wanna know if it responds before I take the system down and open it.
    Well, based on the assumption (yeah, big assumption) that the unit was WORKING before he was called out, we must look at what has changed.

    Typically, jumping in and adjusting a TEV before determining a problem just results in more work later.

  5. #18
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,556
    Quote Originally Posted by hvactech1977 View Post
    I've seen them where they get black gup buildup on the internal parts not allowing it to move freely. That is even with a liquid drier on. You never know what all was done to the system in the past work wise from other techs or if a burnout ever happen. holding the bulb and trying to adjust it first is something I would try first too. check liquid drier for blockage. If the txv is flared in like some cooler/freezers are, I usually just change it with complete new. when a power head fails usually it is drastic.
    I have only seen that black gunk on low temp r-22 systems.

  6. #19
    Join Date
    Jun 2013
    Posts
    6
    I took measurements across filter drier and is good. Held sensing bulb and got no change. Took apart tev and found clog screen. Cleaned and replaced. Running good super heat and subcooloing. Thanks for your input, appreciate the help to think it through. Thats the way learn and become a better tech. Thanks jpsmith and everyone that contributed!!

  7. #20
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,556
    Quote Originally Posted by yvnsteve View Post
    I took measurements across filter drier and is good. Held sensing bulb and got no change. Took apart tev and found clog screen. Cleaned and replaced. Running good super heat and subcooloing. Thanks for your input, appreciate the help to think it through. Thats the way learn and become a better tech. Thanks jpsmith and everyone that contributed!!
    Good to hear.


    If you keep up that kind of logical thinking, and investigative process, you'll do well in this trade.

  8. #21
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    18,322
    NOW...get in the habit of taking and posting pictures.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







  9. #22
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,595
    Quote Originally Posted by phxhvac View Post
    What is the best way to clean a TXV screen noe that it was mentioned. Just curious.

    Sent from my DROID RAZR using Tapatalk 2
    Electrical parts cleaner or PVC cleaner for me, since that's what we have on hand.

  10. #23
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,556
    Quote Originally Posted by phxhvac View Post
    What is the best way to clean a TXV screen noe that it was mentioned. Just curious.

    Sent from my DROID RAZR using Tapatalk 2
    I've actually found that squeezing and rolling the screen between my fingers, then tapping it, open end down, on a hard surface cleans 99% of the debris out of them.

    It's typically dry, flaky stuff and there is no need for cleaner.

  11. #24
    Join Date
    Jul 2011
    Location
    Nanaimo,BC, Canada!
    Posts
    346
    I typically use electrical contact cleaner as it evaporates quickly leaving behind no residue .. Some times you can blow them put with nitrogen..

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