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  1. #1
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    Appion Hose Issues

    Hi all. I'm a new member of HVAC talk. I've been in the trade for a while but when I was trained I was not taught about proper vacuuming practices. For a few years I just checked with nitro and then put the vacuum pump on the system and let it run for at least 45 mins through my gauge manifold. My boss mentioned using a micron gauge to check for leaks on an existing lineset but I had no idea how to use it and honestly neither did he. I prided myself on following proper procedure so it bothered me to find out all the things I didn't know about and was doing wrong. So I did some research and found out about the BluVac and Megaflow kit. The only vacuum pump I had access to was my boss's old YJ Super Evac that I found out could not pull a micron gauge below 250. I purchased a Fieldpiece VP55 and two sets of Megaflow basics kit. Along with the BlueVac I was very satisfied with pulling vacuums. However, on the last 3 vacuums I pulled I noticed I couldn't pull past 700. After some experimenting with shutting off ball valves I found that the Appion hose was leaking. Has anyone had this happen to them and how should I go about fixing it? I was thinking of putting silicone around the hose fittings and crimps but I thought I would ask for advice first. To anyone that has read this far: thank you for your time and hopefully your help.

  2. #2
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    Where are the hoses leaking?

    Did you try changing oil on the super evac?


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  3. #3
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    Thread Starter
    I dont honestly know. I suspect it is where the hose adapter meets the crimp fitting. The copper tube seems looser than it was when new. Do you have any suggestions on how to trace a vacuum leak? I guess I could pressurize it with nitro but I didnt want to subject it to positive pressure.
    On the super evac: we did change the oil. But it has been ridden hard and put away wet for many years due to ignorance by any and all techs who have used it.

  4. #4
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    The appion megaflow hose is pressure rated, so if it is in-fact leaking - you should find it that way.

    Take a look at the hose ends - the little o-rings. That would be the most likely leak source.

    The hose is pretty solid, so I doubt it has a leak.

    Gauge strait to pump, what does it pull?


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  5. #5
    Join Date
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    Will the pump pull vacuum with the micron gauge attached directly to the pump? Are the hose gaskets good? I wouldn’t be afraid to pressurize the hose with nitrogen to leak check it.

  6. #6
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    Quote Originally Posted by heatingman View Post
    The appion megaflow hose is pressure rated, so if it is in-fact leaking - you should find it that way.

    Take a look at the hose ends - the little o-rings. That would be the most likely leak source.

    The hose is pretty solid, so I doubt it has a leak.

    Gauge strait to pump, what does it pull?


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    You beat me to it

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  8. #7
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    Okay, ill get up off of my rear and check the hoses with some nitrogen. I guess I was paranoid about screwing up my hoses.
    The last time I checked the YJ pump was with a Fieldpiece micrometer screwed onto the 1/4 inch port with a brass cap on the 3/8 port. Its been a few months so I dont remember exact numbers but it wasnt able to pull past 200 microns.

  9. #8
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    As for the o-rings I have some new ones to put in but the "old" ones are in there pretty good and I keep forgetting to get a small pick to remove them. The thing is, the hoses are only 2 months old and I never use a wrench to tighten them so they dont appear torn or damaged.

  10. #9
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    If the gaskets look good, they usually are. I use a control screwdriver and/or needle nose pliers to replace them.

  11. #10
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    *gasp* the horror! All that soft brass just begging to be nicked and deformed. 😁 I use the same technique on my charging hoses but Im trying to treat the appoints like they are royalty so I figured Id try something more gentle. Probably overkill, huh?

  12. #11
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    Spray air duster on the suspected leak while attached to the vacuum pump and gauge running at the ultimate steady vacuum. You should see a spike in the reading if you have a vacuum leak.

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  14. #12
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    Thread Starter
    Thanks for your help guys. After walking to my van I realized I had no means of capping the 3/8 side of hoses. After a quick trip to lowes(where i also picked up some keyboard cleaner) I started to assemble the assorted flare adapters to cap off one end. Due to lack of garage or similar indoor fire resistant work space i had to take a break because of rain. Guess I'll get back to it tomorrow.

  15. #13
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    Lowes does not sell a 3/8 flare plug?

    Or better yet, a flare union?




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