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  1. #40
    Join Date
    Jun 2008
    Location
    Rochester, NY
    Posts
    334
    Which side do you guys connect your vacuum gauge too (suction or liquid)? And does anyone use that vacuum sealant that YJ sells that you put on the fittings?

    -Mark

  2. #41
    Join Date
    Dec 2003
    Location
    Citrus County, Florida
    Posts
    1,508
    I use a product called Nylog. I usually put the micron gage on the liquid side; no real reason.
    Doug

  3. #42
    Join Date
    Oct 2007
    Location
    ATLANTA
    Posts
    120
    Quote Originally Posted by Texas-Tech View Post
    Today I ran both 6cfm pumps all day long on a 15 ton split, 2"suction about 120 ft long. When I turned them off I was at 455. We will see in the am what the reading is after setting all night. How much rise would be acceptable and what would it tell me? Could be moisture still in pipe or a small leak,,,,,,,,guess we will see.
    The other 3 are finished and held at 500.

    Hi

    Im curious at how this turned out and curious at how many minutes you guys normally wait to determine if the system is leak free and moisture free.
    Especially in the 410A and 404 systems do you guys usually do a couple or more pull downs to get the moisture out of the systems?

    Thanks

  4. #43
    Join Date
    Oct 2007
    Location
    ATLANTA
    Posts
    120
    Quote Originally Posted by Gunslinger View Post
    I pull a vacuum (no cores installed) and purge with N2. Then I pull a vacuum again. I like to see no more raise than 100 after watching the micron gage for 15 minutes. The use of the core removers and N2 make the process much faster.

    Hi

    When you do your purge after pulling the initial vacuum how much N2 do you suggest using?
    Do you bring the system all the way back up into a positive pressure with the N2 ??
    Is the N2 purge supposed to help remove moisture?

    Also I see in literature where it says to break the vacuum with Nitrogen so does that mean bring the pressure back up in the system to 0 psig or a little on the positive side before adding the refrigerant to the system?

    Thanks

  5. #44
    Join Date
    Dec 2003
    Location
    Citrus County, Florida
    Posts
    1,508
    When I do my first and second vacuum, When the system is in a vacuum, I put N2 into the system about 50 lbs thru the low side. Then I let the N2 escape thru the high side. Pull vacuum again, use N2 again. Then I pull my final vacuum; when the desired level is achieved, I put refrigerent into the system. You never want to open the system that is in a vacuum to the atmosphere or it will "suck in" moisteure and air.
    Doug

  6. #45
    Join Date
    Oct 2007
    Location
    ATLANTA
    Posts
    120
    Quote Originally Posted by Gunslinger View Post
    When I do my first and second vacuum, When the system is in a vacuum, I put N2 into the system about 50 lbs thru the low side. Then I let the N2 escape thru the high side. Pull vacuum again, use N2 again. Then I pull my final vacuum; when the desired level is achieved, I put refrigerent into the system. You never want to open the system that is in a vacuum to the atmosphere or it will "suck in" moisteure and air.

    Hi

    How long do you apply the N2 at 50 lbs ?

    Are you only pulling vacuum on the high side as the means for the N2 to escape? Or are you bringing the system back up to 50 psi with the N2 and then letting it escape through the high side?
    Is that what is referred to as breaking the vacuum with nitrogen?

    Thanks
    Last edited by AtoZhvac; 02-22-2009 at 02:28 PM. Reason: added info

  7. #46
    Join Date
    Dec 2003
    Location
    Citrus County, Florida
    Posts
    1,508
    The term "breaking with N2" means placing N2 into the system while under a vacuum. I pull my vacuum thru both high and low sides. I insert the N2 into the low side . After the system gets pressurized by the N2, I open the high side to let it out. While the high side is still open, I put some more N2 into the low side. Sounds complicated but is not.
    Doug

  8. #47
    Join Date
    Feb 2008
    Location
    Waffleville
    Posts
    10,339
    Quote Originally Posted by spark View Post
    Which side do you guys connect your vacuum gauge too (suction or liquid)? And does anyone use that vacuum sealant that YJ sells that you put on the fittings?

    -Mark
    try to put it farthest from pump. more accurate reading of the system and not the pump
    If Guns Kill People, Do Pencils Misspell Words?

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  9. #48
    Join Date
    Dec 2007
    Location
    houston, texas
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    3,787
    Quote Originally Posted by beachtech View Post
    try to put it farthest from pump. more accurate reading of the system and not the pump
    you can put it anywhere actually, then when you shut off the pump the gauge will read where your at. Most often there is no place else to put it except right there at the access fittings.
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  10. #49
    Join Date
    Jun 2001
    Location
    Saginaw, Michigan
    Posts
    454
    Quote Originally Posted by Tiger93rsl View Post
    Will a vacuum pull the core back in when it gets deep enough if your O-ring isn't holding tight? And how about useing those core removal tools under a vacuum, you would think those o-rings they use would leak over a short period of time. And I haven't found away to repalce the o-rings in my C&D core tool. Never mind I forgot about the ball valve. Anyhow not to hijack this thread but does anyone know how to replace those O-rings?
    on my robinair valves, unscrew the valve body and the ball will drop out once you get the teflon seat out of the way. Once the ball is out of the way, take the screw holding the lever to the shaft and then the shaft will push into the center where the ball was so you can get at the o-rings on the shaft.

  11. #50
    Join Date
    May 2009
    Location
    South Florida
    Posts
    67
    I'm confused, how are you hooking up your vac pump and micron guage if you're not using a manifold? How do you put refrigerant in without letting in air and moisture?

  12. #51
    Join Date
    Jan 2008
    Location
    Outside The Motor City
    Posts
    666
    Quote Originally Posted by beachtech View Post
    try to put it farthest from pump. more accurate reading of the system and not the pump
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  13. #52
    Join Date
    Jan 2008
    Location
    Outside The Motor City
    Posts
    666
    Quote Originally Posted by AHH-COOL View Post
    I'm confused, how are you hooking up your vac pump and micron guage if you're not using a manifold? How do you put refrigerant in without letting in air and moisture?
    DON'T use a manifold?????????
    NO Brains NO Headaches

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