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Markets

Discussion in 'Commercial' started by pintofstout, Sep 26, 2017.

  1. pintofstout

    pintofstout New Member

    Messages:
    1,520
    Location:
    Olean, NY
    Maybe it was just the company i worked for. As an apprentice i had days where i just spent all day cleaning the rack, mopping the floors. Their racks were spotless, always just thought that was a market thing


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  2. flange

    flange Act like you care and do SOMETHING!!

    Messages:
    12,790
    Location:
    IMT--in my truck
    no, its the same in commercial hvac. Some buildings you can eat of the floors, others you protect yourself before going in. For 10 years I had two buildings that were the nicest high rises in the city. Procedure was get there at 7, have coffee with staff until 8, then set up to do your work. When doing the air compressors( mid size screws), they KNEW that no matter what happened, oil would drip in at least one spot, so they simply had the staff painter ready. As soon as I was done, they would clean up the oil drips, scrap high spots, then repaint the floors, lol. I think they eventually had an inch of paint on that chiller plant floor. In other places, they were soo dirty you wore booties to protect your shoes, lol.
     
  3. LemonWizard

    LemonWizard Blinky Lights Wizard

    Messages:
    2,098
    Location:
    Ohighyo
    This is my experience as well, even if you can get to a good vacuum it won't hold due to leak through. On the other hand you know the linesets are free of air so there is just the coil to quickly evac.
     
  4. LemonWizard

    LemonWizard Blinky Lights Wizard

    Messages:
    2,098
    Location:
    Ohighyo
    The fundamental problem with leak checking with a vacuum is that you are testing joints (and the cheap chinese copper for that matter) at basically 15 psi (atmos vs vacuum) instead of 100 or 150 psi versus atmos.

    Not saying it doesn't work for you just pointing it out
     
  5. frozensolid

    frozensolid Psychologist's Dream

    Messages:
    12,216
    Location:
    Earth
    A complete new system startup whether a rack or single circuit has different rules from a active system retrofit.

    Active system: Quick pumpdown or blow and go. Mirror check all new joints. Recheck with soap under refer pressure.

    New startup 300 psi nitro whole system for 24 hours. Then pump till it holds less than 200 microns for 30 minutes. Break with refer add till running properly.

    Virgins need more care or it will turn to a service slut later. The girl that's been around is more forgiving. :)
     
  6. pintofstout

    pintofstout New Member

    Messages:
    1,520
    Location:
    Olean, NY
    Well yeah this little innocent flower in the photo was brand new top to bottom. I see she's had her cherry popped today though, couple hundred pounds of meat in er..


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  7. pintofstout

    pintofstout New Member

    Messages:
    1,520
    Location:
    Olean, NY
    Yeah i get that, but I've been burned by 250 psi dozens of times and been burned by 500 microns zero times. Ok once maybe.... One time for sure....

    But so many times I've sat on 250 for an hour only to not achieve vacuum, repressurize with tracer gas and nitro, and find some tiny little freaking flare leaking two miles away from anything I've been wrenching on.

    When i have a trainee i use nitro so as not to pass on bad habits though.


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  8. Chuck

    Chuck The Other Dude

    Messages:
    7,689
    Location:
    LAX
    Not doubting you, but how have you been burned by 250 psi?
     
  9. oroy54

    oroy54 New Member

    Messages:
    22,510
    Location:
    Victoria, Texas
    I did not read all of this, but a micron gauge is not the holy grail of vacuums.
     
    mike1020 likes this.
  10. frozensolid

    frozensolid Psychologist's Dream

    Messages:
    12,216
    Location:
    Earth

    But it's easier than mercury
     
  11. HMD

    HMD does it matter?

    Messages:
    92,588
    Location:
    here
    a vac -q doesn't lie, neither a mercury manometer.
     
  12. knave

    knave Undeterred

    Messages:
    7,915
    Location:
    Out for a rip
    Father Time doesn’t lie.
    Fixed the leak? We’ll see.
     
  13. HMD

    HMD does it matter?

    Messages:
    92,588
    Location:
    here
    and i wish father time would sit down, instead of advancing on a skate board
     
    knave likes this.
  14. somedude

    somedude Senior Stalker & PITA, aka zachhvac

    Messages:
    3,365
    Location:
    Los Alamos California
    When i worked for that nice company who stole money from me in California after my second week i would go to the supply house first and buy at least a gallon of degreaser , put it in a brass sprayer and degrease the entire rack.
    One morning my mrg wanted to meet me for breakfast
    He said he was concerned about my attitude, i explained that his stores where an absolute disaster and he challenged me. I said pick a store.
    We drove to the store and removed 12 refrigerant drums, 9 empty oil gallon containers , the room had no light, it had kitty litter 2 inches deep on the floor, contactors so oversized the covers could not close etc etc etc . The idiot who was 'taking care' of the stores is still there , in California its not what you do or dont do, they just want obedient little sycophants
     
  15. pintofstout

    pintofstout New Member

    Messages:
    1,520
    Location:
    Olean, NY
    Not letting it sit long enough, pressure stays at exactly 250 for an hour and still has a leak. In that hour, if you go straight to the pump, it's generally pretty apparent that your not going to be pulling a deep vacuum. Then the nitro comes out.


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  16. 392problemchild

    392problemchild New Member

    Messages:
    20
    Location:
    Atwood KY
    I was taught not to use nitrogen on an individual case so theirs no chance on contaminating the refrigerant.
     
  17. pintofstout

    pintofstout New Member

    Messages:
    1,520
    Location:
    Olean, NY
    Yeah i wouldn't use nitro or expect a deep vacuum on something with valves that had refr on the other side.


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  18. flange

    flange Act like you care and do SOMETHING!!

    Messages:
    12,790
    Location:
    IMT--in my truck
    a small leak needs more than an hour to show its head. consider how small some leaks can be and then the volume of gas you used to test. its not like water which is essentially noncompressible its why they tell you test for 24 hours.
     
    Zman, mike1020 and crackertech like this.
  19. Chuck

    Chuck The Other Dude

    Messages:
    7,689
    Location:
    LAX
    Speaking of market racks and pulling vacuums, I think I caused some heartburn on 3. On a thread discussing the finer points of micron levels I posted that on racks we just purge and go. Probably get bant
     
    Jon and LemonWizard like this.
  20. mike1020

    mike1020 entitled millennial

    Messages:
    17,811
    Location:
    on the roof of target
    Lol