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  1. #1
    Join Date
    Nov 2011
    Location
    North sweden, Ume, Where the birches growing without limits.
    Posts
    97

    A li'l story 'bout my sick friend "Frosty"

    Who's a 1996's Bitzer 2N 5.2. This "li'l" fella is placed in a loft, working for some freezer cabinets (SESAM-cabinets) out in the store 20 meters away, on my half-year inspection round for this machinery (and some more machines to other refrigerator boxes in the store) I saw "Frosty" completley frozen at the suction line eliminator, all the way to the motor housing, Lots of Ice had grown on the suction line ack., flashing sight glass and almost empty in the reciever tank (18 kg of R404A) and low pressures (-36 C and +30 C) Found some leaks at the SESAM cabinet by the magnet valves, fixed'em and filled some more refrigerant. Started filling... 8 kgs and still flashing, filled 4 kg more, still flashed after total 12 kg, made a pumpdown (closed outgoing from the reciever) Yep, the tank told me about a very high level. Everything's fine i supposed. Good pressures as well.

    Went down to the store for a last check... WTF... No cold air from the outlets... Began to think "shiet", went up to the machinery again, Frosty larmed for Low oil pressure. The oil sight glass... Empty. Now what i thinked?! Called a job friend (have some more experienced job friends I can call if I'm hitting patrol as a "greenhorn") He came there with some oil, meanwhile, I took out some refrigerant from the system ('bout 11 kg) and filled it into a clean can.

    After much work we got the system started again and the oil went back into the compressor, took away the ice that hided both suction filter and suction line ack. But it started to get frosty at the suction line faster than pronouncing the word "holy ****", filled up 5 kg of ref.

    Went back the day after, measured some temperatures and pressures, wrote'm down and told the guys at the company the values I'd got. "Tttttt, that's a saga youre telling us, you haven't measured right" So yesterday i went back, measured again while I had Telefon contact and told the values. After a while the job friend showed up (same as earlier) and he was same confucius as I was. 2 sections on the Sesam cabinet, one section gave me the values -14 C by the TEV's bulb, -20 C in evaporation, and +8 C at the sution line outside the cabinet, the other cabinet gave me -11 C at bulb, -19 C in evap and -20 C at the suction line outside the cab. BIG WTF... We both scratched our heads so the dandruffs swirled in the air or anything like that.

    Heard that one TEV flushed really much, so we replaced that li'l bastard, and started Frosty again, still flushed. Adjusted the TEV to totally closed, still flushing. I Expected the nigt before we changed TEV that it could be a faulty suction gas heat exchanger, but once more "It's unpossible" from my job friends, haha i love my job .

    On monday we are going to disect the cabs and see if the heat changers are possibly to change to new ones or just replace them with some copper pipe, if out of stock.

    This is a pair Pics showing frosty one day after "defrost", now you know why I'm calling him "Frosty"




    /Patrik from Sweden

  2. #2
    Join Date
    Nov 2011
    Location
    North sweden, Ume, Where the birches growing without limits.
    Posts
    97
    Forgot. The temp just before the suction filter, placed by Frosty, i measured -20 C at the pipe, just where the insulation ends.

  3. #3
    Join Date
    Dec 2003
    Location
    Northern VA
    Posts
    622
    Welcome, Putte.
    Looking forward to hearing the all of it.
    "Iron sharpeneth iron..."

  4. #4
    Join Date
    Nov 2011
    Location
    North sweden, Ume, Where the birches growing without limits.
    Posts
    97
    Thank you atmosphere

    I'll keep you updated 'bout this "funny" li'l case. The funniest of everyting is that I've been "pitching" many experienced friends at my job on their noses after my spontaneous impulses "Holy ****, why didn't i thinked about that before, thats obviously, I'm a genius"

  5. #5
    Join Date
    Nov 2011
    Location
    North sweden, Ume, Where the birches growing without limits.
    Posts
    97
    So...

    Frosty is healthy again. It was one heat exchanger that flushed liquid into the suction line before the evaporator and filled up the suction line ack. When I came there this morning Frosty had evacuated all oil into the evaporators and tripped on the oil pressure switch. To much liquid in Frostys crankcase.

    Meanwhile i changed the oil separator, my job friend dissected the cabinet and removed the heat exchanger that was a 1/4" Cu Pipe stuck into a 1/2" Cu pipe (or was it 5/8"?) Really simple solution. We took it to the workshop and pressure tested it, liquid line was like a schweizer cheese We maded a new one, mounted it, maked evacuation and started Frosty up. Now he ran really perfect, no flashing sight glass and "basement cold" suction line, just like the way I want it

    The sweet taste of victory is just so good Yummi
    Old one
    Looks like this
    New one
    Frosty no more

  6. #6
    Join Date
    Dec 2003
    Location
    Northern VA
    Posts
    622
    Well some of us don't see alot of this type of equipment everyday.
    Good to hear a story like that, but it kind of read like it was from the land of OZ.
    "Iron sharpeneth iron..."

  7. #7
    Join Date
    Nov 2011
    Location
    North sweden, Ume, Where the birches growing without limits.
    Posts
    97
    Hahaha Yep it ended up well, back today, adjusted the superheating at the TEV. The cabinet sank very fast in temp now, and best of all, still no frost at Frosty

    Dissected the old heat exchanger, the inner pipe had a crack almost thru, just keeped together by a small edge, that broked when i cutted the bigger pipe with a pipe cutter.

    I know, it's a saga, unusual but it can happen.

  8. #8
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    19,287
    Where are you from? Telefon contact?
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







  9. #9
    Join Date
    Nov 2011
    Location
    North sweden, Ume, Where the birches growing without limits.
    Posts
    97
    Quote Originally Posted by timebuilder View Post
    Where are you from? Telefon contact?
    Hello timebuilder

    I'm from Sweden. My Spoken english is not the best, but my written are way better Check my profile for mail address.


    Isn't there a PM function at this forum? Or have I missed it?

  10. #10
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    19,287
    Okay, that makes sense. I had thought you might be somewhere in Europe, but we have an occasional American who has more trouble communicating than you, primarily because we have permitted some of our people to become lazy, in the name of political correctness.

    The PM function is enabled for our "professional" members. You can submit an application as a working pro with 15 or more posts.

    Welcome to the site. Nice account of the failure and the repair.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







  11. #11
    Join Date
    Nov 2011
    Location
    North sweden, Ume, Where the birches growing without limits.
    Posts
    97
    Ah okay! But sweden is north europe if we put it that way

    Permit folks get lazy? With responsibility its ok, but further than that big no-no according to me.

    Thank a lot.

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