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  1. #1
    Join Date
    May 2003
    Location
    Sarasota. Fl
    Posts
    1,262
    Alright guys, Ive been doing Commercial and Residential AC for five years but Ive just recently began doing service on refrigeration.(6-9 months)

    Went to this True "sandwich prep" station last Friday night.

    Model #Tssu4818m / Serial#Ae444oy / 134A

    Found the "tap valve" leaking,recovered,changed tap valve,vacuumed and weighed in charge.

    (I also changed the dryer to one with a high side service port.)

    Data plate called for 11oz.(134A)

    Upon start up pressures were about 12/120.(seemed low)

    Condensor fan wasnt blowing much heat.(same as when I arrived)

    Temp slowly came down to the 40`s from the 70`s.(fieldpiece bead in door)

    Customer wanted to go home(11:00 pm),it was in the forties in the box so I told him to call if there was an issue the next day.

    This morning he calls and tells me it cooled fine Saturday but Sunday it was in the fifties again.

    I go out tonight recover,vacuum and weigh in charge again.

    This is a cap tube system.

    Pressures were 12/115.

    Liquid line temp was 79.

    Suction line temp was 68.

    Once again no heat from condensor fan.

    Due to the low Head pressure I began to add additional 134A.

    Condensor was getting warmer,suction line temp dropped to 49 degrees.

    Temp in box got into the mid 30`s.


    So my question is could the the Data Plate have been wrong?

    Does that happen often.

    Or is there something Im missing?

    I still couldnt get much heat from the condensor fan but I didnt want to overcharge it.

    Finall pressures 18/140.

    Suction line temp 49,liquid line 79.

    What else should have I looked for?

    Any suggestions will be applied and I will let you know the results.

    Thank you.

  2. #2
    Join Date
    Feb 2004
    Location
    puerto rico
    Posts
    121
    hello friend; flush the cap-tube, to much liquid.

  3. #3
    Join Date
    Jul 2001
    Location
    Gold Coast of Connecticut
    Posts
    4,578
    If you did not install the same oem filter drier that is the problem with the charge, but the bigger problem is the unit is most likely still has a leak. The evaporator leak like hell in the sandwich units. I never just scale in a charge if i changed the drier. You didi well for now but you will be back within a year!

  4. #4
    Join Date
    May 2003
    Location
    Sarasota. Fl
    Posts
    1,262
    Originally posted by Freezeking2000
    If you did not install the same oem filter drier that is the problem with the charge, but the bigger problem is the unit is most likely still has a leak. The evaporator leak like hell in the sandwich units. I never just scale in a charge if i changed the drier. You didi well for now but you will be back within a year!
    Id be happy with not going back this month.



    What makes you think there is an additional leak?

    Im not questioning your expertise,just trying to understand.

    It held a vacuum "on the money" for thirty minutes.

    Thanks for the help guys.

  5. #5
    Join Date
    Mar 2004
    Location
    Lombard IL
    Posts
    171
    ACIDS IN THE VEGI'S CAUSE LEAK IN ALUMINIUM COILS.

  6. #6
    Never go by the weigh in charge only, thats why you have gages. Also when you went back was it low on gas or what? If so, you may indeed have antoher leak in the evap as the guy above said those prep coolers that store vinegar based or ketchup, dressings and junk really eat up coils.
    Hey cockroach, don't bug me! ©

    www.AskTheDiceman.com

    www.TheColdConspiracy.com

    www.Pennwood-HVAC.Com

    Bring Em Home....

  7. #7
    Join Date
    Sep 2001
    Location
    prov.r.i.
    Posts
    1,441

    Talking tech in need of help

    yep dice and the other fellow is right,if you have any of that green corrosion on any of your refer lines,you can bet you have another leak.take all of tht armaflex off and you will see all that green on your suction line and captube.clean that crap off pressurize with alittle nitro and spray with some soapy water,you will see all kinds of little bubbles forming,
    if at first you dont succeed,then skydiving is not for you

  8. #8
    I always find em on the u bend joints, inside at the bottom of the evap coil.......fun.
    Hey cockroach, don't bug me! ©

    www.AskTheDiceman.com

    www.TheColdConspiracy.com

    www.Pennwood-HVAC.Com

    Bring Em Home....

  9. #9
    Join Date
    Sep 2001
    Location
    prov.r.i.
    Posts
    1,441

    Talking tech in need of help

    yep you r right there my friend,more often than not you find that crap on an older cooler,as soon as you remove armaflex all the water comes running out,and that green **** burns your fingers if you have any cuts or scratches.
    if at first you dont succeed,then skydiving is not for you

  10. #10
    Join Date
    May 2003
    Location
    Sarasota. Fl
    Posts
    1,262
    Im thinking that you guys are right,maybe there is an additional leak.

    The one at the tap valve was real obvious though.

    Oil everywhere,I got out the soap bubbles and sure enough it was bubbling from around the perimeter of the valve.

    I should have leak searched the evap why I was at it.

    (Lesson learned)

    That Friday one of the o-rings in my low loss hoses had become screwed up and I noticed it was leaking.

    So I thought that during my first trip I had possibly left some non-condensibles in the line.

    So I recovered ....etc.(with new manifolds and hoses purchased over weekend)

    I didnt get a call today, but it wont surprise me if I get one soon.

    And the first thing Ill do is leak search that coil.(thanks)

    We have a 10 month cooling season down here and the AC aspect is pretty simple to me.......

    But now...I feel like a "rookie" again.(which is a good thing)

    Thanks for the help,Ill be sure to post any updates.

  11. #11
    Join Date
    Jul 2001
    Location
    Gold Coast of Connecticut
    Posts
    4,578
    If the gas was needed when the line tap valve was put in, where did that gas go, I just order a coil when i add gas in one of those units.................the coils are cheeeep!

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