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  1. #79
    Join Date
    Apr 2002
    Location
    Western piedmont of Carolinas
    Posts
    1,606
    I tried the copper line trick, worked great the first time, but the flares don't hold up. I also have a problem keeping up w/all that copper tubing, and how do you keep it clean(inside).

  2. #80
    Join Date
    Jul 2000
    Location
    NW IL.
    Posts
    3,935
    Quote Originally Posted by mlock View Post
    I tried the copper line trick, worked great the first time, but the flares don't hold up. I also have a problem keeping up w/all that copper tubing, and how do you keep it clean(inside).
    Flare plugs.
    Aircraft Mechanical Accessories Technician. The Air Force changed the job title to Air Craft Environmental Systems Technician. But I've decided I'll always be a Mech Acc.

  3. #81
    Join Date
    Feb 2009
    Location
    Ontario, Canada
    Posts
    55
    I am reading posts about micron gauges to get an idea which one to buy and thought I would put in my 2 cents as to why they are necessary.
    I am still new at HVAC and recently put a small system together in the shop. I pressure tested the system and it seemed to hold the pressure so I pulled a vacuum. I could not get the vacuum gauge to hit 500um. I found a verrrry small leak in a flare joint that needed tightening. I then got down to 500um in a couple of minutes.
    In my opinion if you're not using a micron gauge you don’t care about the quality of your work.

  4. #82
    Join Date
    Mar 2006
    Posts
    186

    Appion

    Vacuum rated core removal tools
    http://www.appioninc.com/products/vctfeatures.html

    Anybody used them yet and how do they hold up?
    TANSTAAFL - There ain't no such thing as a free lunch!

  5. #83
    Join Date
    Jul 2000
    Location
    NW IL.
    Posts
    3,935
    Quote Originally Posted by clarkkent View Post
    Vacuum rated core removal tools
    http://www.appioninc.com/products/vctfeatures.html

    Anybody used them yet and how do they hold up?
    Yes I do. They hold up well and the bore through the core remover has a larger opening than C&D's, Yellow Jackets or Cliplights. The JB's have a larger bore but the flare end has the sharpness of a hole punch and will chew up your hose gaskets in short order.


    Appion on left JB on the right.

    The Appion has double O-rings in the coupler and for the lever shaft for a good seal.

    Worth the price? Yes they are.
    Aircraft Mechanical Accessories Technician. The Air Force changed the job title to Air Craft Environmental Systems Technician. But I've decided I'll always be a Mech Acc.

  6. #84
    Join Date
    Mar 2007
    Location
    wedged in freezer shelf
    Posts
    6,748
    Mech if you look at all J/B hoses and fittings designed specifically for pulling vacuum they use O-Rings and not gaskets.
    I believe the J/B VCRT's are designed to work with O-Rings.
    I am in the process of switching all my vacuum equipment over to O-Ring equipped
    “If You Can Dodge A Wrench You Can Dodge A Ball”

  7. #85
    Join Date
    Jul 2000
    Location
    NW IL.
    Posts
    3,935
    Quote Originally Posted by itsiceman View Post
    Mech if you look at all J/B hoses and fittings designed specifically for pulling vacuum they use O-Rings and not gaskets.
    I believe the J/B VCRT's are designed to work with O-Rings.
    I am in the process of switching all my vacuum equipment over to O-Ring equipped

    Was not aware of that. Thanks.
    Aircraft Mechanical Accessories Technician. The Air Force changed the job title to Air Craft Environmental Systems Technician. But I've decided I'll always be a Mech Acc.

  8. #86
    Join Date
    Apr 2011
    Location
    Florida
    Posts
    107
    so how do you find a leak with a vacuum? and what are some other things to look for when you have a vacuum pulled? Thanks every one for all the input.

  9. #87
    Join Date
    Dec 2008
    Location
    Buffalo NY
    Posts
    3,107
    Leak test, then vacuum.
    Join http://scopeny.org/ Shooter’s Committee on Political Education

    The world is full of sheep,try not to join the flock.

    Support the Skilled Trades, Don't DIY

  10. #88
    Join Date
    Feb 2009
    Location
    Bend OR
    Posts
    15

    vacuums

    Remember, the micron guage can malfunction too. I've seen some that read 300 microns when I know there's a leak. Electronic gizmos can be unreliable... got a computer? Still, it's very important. Change the oil in your vacuum pump after every job, make sure seals are good, especially low loss fittings that have had 410a pressures on them or are just old. If you still think it's your vacuum pump, check it with another micron guage to be sure. Also, if you have moisture in a system that doesn't leak, it can take a long time. The water has to boil out (water will boil at 0 degrees in a complete vacuum) which causes expansion then the vapor must be removed. Keep your copper clean and dry.

    I once spent 6 hours looking for a leak that turned out to be in my manifold set. Boy was I mad

  11. #89
    love the apion mega flow kit. the time savings in amazing! too much $$ though. but then ain't it all

  12. #90
    Join Date
    Jul 2011
    Location
    northern Minnesota
    Posts
    36
    my digital gauge set has microns right on it, and i us it everytime the vac is on. mine starts at 0 and goes negative from there. like to see at least -600 the best i've ever seen was -755.

  13. #91
    Join Date
    Jul 2011
    Posts
    354

    Confused

    Quote Originally Posted by qwerty hvac View Post
    Leak test, then vacuum.
    agreed!!!!!!!!!!!!!!

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