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  1. #1
    Join Date
    Sep 2010
    Location
    Western, MO
    Posts
    871

    New gauges and hoses

    I'm having trouble pulling a good vacuum on any of the hoses or manifolds I have.

    I going to buy at least two new sets this week. I'm not up to needing the speed of the digitals. I've used Yellowjacket all the years I've been doing this.

    I see many old brand names and a few new ones in the catalog, what are you guys liking?

    jim
    Common sense isn't very common anymore.

  2. #2
    Join Date
    Jan 2005
    Location
    Akron
    Posts
    1,204
    You should consider the Appion vacuum rated hoses for evacuation 1/2" x 1/4". I would suggest two hoses and two core removal tools. Attach the hoses directly to the pump with a 1/2 flare x 1/2 flair by 3/4 MPT (or whatever is screwed into your pump) to the pump. This will cut your evacuation times considerably (typically by a factor of 10). Use one of the side ports of the core tool for your vacuum gauge. This will allow you to isolate the gauge from the pump to verify vacuum levels. After The evacuation is finished, valve off the core tools, remove the large hoses, purge and attach your manifold and charge the system.

    For standard hoses, I like NRP. They have a black heavy duty hose with a ball valve or if you prefer a really nice low loss fitting. Most hoses are Goodyear GY5 hose so it really comes down to the fitting construction. NRP does a nice job with the fittings.
    JLB,

  3. #3
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,946
    I will second Jim's reccomendation on using straight hoses and VCRTs for evacuation rather than using manifold.

    I will, however, disagree on the NRP low loss fittings. I dislike them.

    I'm looking at a set of ball valve hoses for my next purchase.

  4. #4
    Join Date
    Feb 2007
    Location
    Toronto, Ontario
    Posts
    300
    Ug hate the ball valves. Wait until you keep knocking them open while transporting!

  5. #5
    Join Date
    Jan 2009
    Location
    Fairfield county Connecticuit
    Posts
    778
    whats wrong with knocking them open you don't leave refrigerant in your hoses do you?

  6. #6
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,946
    Quote Originally Posted by mario_m View Post
    Ug hate the ball valves. Wait until you keep knocking them open while transporting!

    Actually, I vent my hoses after servicing each job and ball valve hoses will make that go a bit easier.

  7. #7
    Join Date
    Jan 2009
    Location
    Fairfield county Connecticuit
    Posts
    778
    Quote Originally Posted by jpsmith1cm View Post
    Actually, I vent my hoses after servicing each job and ball valve hoses will make that go a bit easier.
    and your hoses will last longer!

  8. #8
    Join Date
    Feb 2007
    Location
    Toronto, Ontario
    Posts
    300
    I discharge my hoses (allow pressure to draw back through low side), but I leave some vapour. Don't you put air in the system if you empty the hose?

  9. #9
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,946
    Quote Originally Posted by mario_m View Post
    I discharge my hoses (allow pressure to draw back through low side), but I leave some vapour. Don't you put air in the system if you empty the hose?
    Never had an issue.

    If I am hooking up to a system that is in a vacuum, it is broken and will require leak check, drier, evacuation, and recharge making air in the system a non-issue.

    Otherwise, the system is at a positive pressure and a quick hose purge removes it.

  10. #10
    Join Date
    Sep 2010
    Location
    Western, MO
    Posts
    871
    Only if you tap into a system in a vacuum. And then you have bigger problems.

    Thanks for the advice guys. I have to do some checking around tomorrow.

    I did a vacuum meter to pump test with a stack of hoses and can't believe I have pulled good vacuum on systems. Even my newest ball valve leaks.

    jim
    Common sense isn't very common anymore.

  11. #11
    Join Date
    Sep 2008
    Location
    VA
    Posts
    1,845
    One of the guys here suggested Nylog sealant/lubricant, when I had the same question. I was going crazy over not being able to hold a vacuum on any of my manifolds.

    I have a cheaper Yellow Jacket manifold about 2 years old. I pulled the valves, cleaned them, and lubed them up with Nylog. New YellowJacket hoses standard RYB. Of course, I lubed the seals in the hoses aswell. I haven't used it on my Titan or Smans yet.

    Haven't had a problem since, holding <500micron vacuum for over 30 minutes.
    "The only true wisdom is in knowing you know nothing" Socrates

  12. #12
    Join Date
    Jan 2005
    Location
    Akron
    Posts
    1,204
    Quote Originally Posted by jpsmith1cm View Post
    I will second Jim's reccomendation on using straight hoses and VCRTs for evacuation rather than using manifold.

    I will, however, disagree on the NRP low loss fittings. I dislike them.

    I'm looking at a set of ball valve hoses for my next purchase.
    There are only two problems with low loss fittings, techs over tighten them and they try to use them for evacuation. If you are working on smaller systems (less than 5 tons) they are a much better solution. I have been using NRP low loss fittings for over 20 years and have never had a single failure of the fitting. We also have them in several program applications (hundreds of sets) and again we almost never have to warranty them. (1 or 2 in three years)

    On a side note, dumping the liquid from the high side into the low side is not a good practice for today's critically charged systems. When checking charge, what is in the hose is not in the system. Adding it to the system after the charge is correct simply overcharges the system.
    JLB,

  13. #13
    Join Date
    Oct 2009
    Location
    Kingsport, Tennessee
    Posts
    131
    I hope you dont mind, and sorry for walking on your post.

    But, just yesterday I was looking into my manifold and hoses too. I ended up pulling a vacuum on the hoses (ball valve at pump), and valved off and have left the gauge set in a vacuum. was trying to boil off any left over refrig. You guys see any issue with leaving it in the vacuum state? I was going from r22 to 134a with the set. Thanks!

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