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Thread: TXV problem

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  1. #1
    Join Date
    May 2009
    Location
    northern kentucky
    Posts
    143

    TXV problem

    Well I think I can say i've seen it all. Worked on a 20 ton train split system today, Found a bad txv valve a week or so back. Scheduled the repair, go and recover the refrigerant. remove the bad power head (bolt together) and to my suprise the gage was gone! The evap coil has 4 expansion valves with hot gas by pass, so this was keeping it running. First time for this one.

  2. #2
    Join Date
    Apr 2012
    Location
    Paper Street Soap Company
    Posts
    2,304
    The "GAGE" ?

    Im guessing is was shut so HGBP kept it running

  3. #3
    Join Date
    May 2009
    Location
    northern kentucky
    Posts
    143
    My bad CAGE. The good thing about the mind going is you don't know it.

  4. #4
    Join Date
    Nov 2004
    Location
    up in the hizzy
    Posts
    1,376
    I read it twice and I still dont get it, cage,gage??? was it gone? what are you talking about?

  5. #5
    Join Date
    Nov 2005
    Posts
    1,350
    gauge?
    hot gas kept it running. Trane used to put high temp limits on the discharge line of their split systems.
    I STARTED WITH NOTHING, AND I STILL HAVE MOST OF IT!

  6. #6
    Join Date
    Jun 2001
    Location
    Northwest Indiana
    Posts
    1,302
    Quote Originally Posted by valdelocc View Post
    I read it twice and I still dont get it, cage,gage??? was it gone? what are you talking about?
    Think of it as the "cartridge" on a sporlan valve.
    Each cage has a tonnage rating for a universal valve body.
    If you cant fix it right, try again.

  7. #7
    Join Date
    Apr 2002
    Location
    most of the time in the Philippines
    Posts
    1,211
    Alco take apart TXV's [T series] have selectable cages inside. The cage has the port, superheat spring, and adjustmnet all in one assembly. Trane used to use them a lot. Check them out at Emerson's website. Cage missing- I never encountered that! Just when you think you've seen it all. he he

  8. #8
    Join Date
    May 2009
    Location
    northern kentucky
    Posts
    143
    Unit has two 10 ton scroll compressors in tandom niether with discharge limits. I guess the only thing that kept it from distroying itself is feeding enough hot gas into the evaporator to stop it from flooding back to the compressor. The bad thing is this is not the only problem this unit had. The second stage compressor shuts off, cutting capacity down to 10 tons. No solenoid valve to shut down any of the expansion valves. Now one 10 ton compressor is trying to feed 4 five ton valves. Unit designed this way. I guess it works this way just not very well. Now it has 4 new expansion valves,a new hot gas by pass valve, liquid line solenoid valve to isolate two of the txv valves, and a solenoid valve to shut off the hot gas to that set of valves. I checked the operation of it today, working better than it has ever according to the customer.

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