I have a couple of YJ heavy duty hoses that I have removed the depressors from and use as a straight hose for evacuation purposes.

I rarely evacuate through my manifold anymore.

 

The best hoses for pulling a vacuum are the biggest ID you can get that don't leak.

I also agree with jp though if you want fast don't pull your vacuum through a little 1/4" two way manifold.

But .... you can speed up a two way manifold by using
Bigger hoses 3/8 or 1/2 (depending on your vacuum pump connections) with 1/4" QC's on the other end.
or make your 1/4" hoses as short as possible but 1/4" lines are not recommended for pulling vacuum.

 

So are you going from vacuum pump with 2 3/8 hoses right to the service valves with a micron gauge connected at the unit? Or just evacuating thru one 3/8 hose?

I am asking because I have heard that air can permeate thru rubber hoses under a vacuum.

 

I have a JB pump so I've been using two black Y/J 3/8"X1/4" hoses from the pump to a set of core removers or service valves.

If I don't hook up the manifold I'll hook up the refer tank to the 1/4" port on the pump to break the vacuum through the 3/8" lines with the ball valve shut off on the pump.

 

How long does it take to get to 500 microns using your set up

 

Huh

 

huh? how long 10 minutes 20 minutes etc

 

yes :anyone:
You can't put a specific time on pulling a vacuum on a system like that as they would all be different.

 

My experience is that the ends of the hoses are as important as the hoses are... Sometimes the O rings in the ends get weak and will leak around 1000 microns... then it takes a LONG time to get down.

I do well with regular YJ hoses, however I am careful with the ends.

 

Well here is the set I have!

http://www.appioninc.com/products/mgakitfeatures.html

The manifold is huge and funny looking, but with the diaphragm-operated valves and bearing-actuated knobs provide down to 20 microns, and does it quickly!

I'm so done with cheap undersized YJ hoses and leaky gauges/manifolds.

 

I use yj heavy duty 3/8 hose to suction side valve and the micron gauge on the liquid side. Both sides get a core removal tool. Alot faster that way than through gauge set. No problems getting below 100 microns.

 

I have a demo Testo 550, you will love them. However, as with most manifold sets not real practical for evacuation unless you want to spend all day.

I don’t use any manifold for evacuation, I only recommend Appion evacuation hoses and core removers. Evacuation time is all about flow, get yourself a 1/2 hose and ditch the manifold for evacuation. Most hoses will not hold under 500 Microns, Appion hoses are vacuum certified down to 20 Microns.

I have ran tons of tests over the last several years. I recently ran a test on 2 two ton splits with 20 foot linesets. Conventional method with manifold 54 minutes to 500 Microns. Appion core remover and 1/2 hose to 500 Microns (no gauge manifold) 7 minutes.

Good luck

 

Thanks a lot for the info.

No I was not planning to use my manifold to pull a vacuum, I use 2 3/8 YJ hoses and core removers.

Usually have trouble getting below 500 and was thinking the hoses were to blame. Someone said I should get steel hoses but I checked on them and they are 180 for a set of 2. I will check out appion hoses. Can you get them online?

BTW I already got my 550s with 2 pipe clamps and love them already.

Thanks and take care.

 

I was just dealing with this issue recenty, leaky set-up that wouldn't hold a vacuum below 1000 microns. I purchased a new vacuum "tree" for my pump, and a 3/8x1/4 high vacuum hose got rid of the manifold and use a core remover and can once again hold a vacuum under 200 microns (quickly). Best thing to do is get rid of as many fittings that are potential leaks and test your equipment to be sure you can hold a low micron level.

 

This is what I use for smaller (under 10 tons or so) system evacs. The pics below show a remake version that is smaller than the earlier one I used and this one can pivot to accommodate the stiffer SS hoses. It is 3/8" from the pump and up the middle of the manifold. There it splits left and right to the 3/8" (?) tubes that have their own ball valves at the bottom. The bottom left and right ports are used for refrigerant tank hook-up and whatever else I want. In this pic set I used two over sized 1/4" SS hoses hooked to the high and low side.

The system is an 8 ton (I think) and the lines are 1/2"A - 1 1/8". The lines go up to the second story, and across to the other side of the building. 50 minutes and I got under 200 microns with pump running. Under 400 after a pump shut off and a 20 minute hold.

PS I did not do this compressor install and cut out the suction service valve and port. I will insulate the suction line before I walk away from this job.

 

Thats a nice setup you have there.

Thanks for the idea on the hyd. hose I never thought of that.

 

This is what I use for smaller (under 10 tons or so) system evacs. The pics below show a remake version that is smaller than the earlier one I used and this one can pivot to accommodate the stiffer SS hoses. It is 3/8" from the pump and up the middle of the manifold. There it splits left and right to the 3/8" (?) tubes that have their own ball valves at the bottom. The bottom left and right ports are used for refrigerant tank hook-up and whatever else I want. In this pic set I used two over sized 1/4" SS hoses hooked to the high and low side.

The system is an 8 ton (I think) and the lines are 1/2"A - 1 1/8". The lines go up to the second story, and across to the other side of the building. 50 minutes and I got under 200 microns with pump running. Under 400 after a pump shut off and a 20 minute hold.

PS I did not do this compressor install and cut out the suction service valve and port. I will insulate the suction line before I walk away from this job.

 

tree setup



I know this is an old thread....looking for a typical manifoldless tree setup for pulling a vacuum. Also source for ss {stainless steel?} hoses
Thanks

 

I have my hoses custom made. Not sure who may be in your area, but I utilize the services of Evco House of Pipe and Fittings here in Utah. For under fifty dollars you can have 3/8" SS steel braided 6000psi burst pressure hydraulic hoses and fittings made. I have a set of ten footers for certain commercial refrigeration systems I tend to on occasion. I have no issue with permeation on these hoses and hold 50 microns with no problem. The beautiful thing about thinking out of the box is knowing that there are a ton of different types of fittings...just a little ingenuity and creativity and you can make your own vacuum tree or vacuum apparatus for pennies on the dollar.
I like your personalized set-up, JTROUSE.

 

Any chance of getting some contact info, slc? Even with shipping that is a DEAL!

 

 

I like that, simple.

Who has the 1/4 Female to 1/4 Female to connect a gauge straight to the line? I normally connect my gauge with a short YJ hose.

 

comes like that out of the box
That is a 3/8 id gorilla hose with 1/4" ends, I put a 1/4"x 3/8" adapter on the other end to hook up directly to my pump.
I have found that the less fittings you have the less time you spend trying to figure out why it's taking so long to pump down a system that held a 300# nitrogen charge.

 

I guess all this talk is on residential/light commercial.im used to heavy commercial/industrial.i only use 1/2-3/4 hoses for everything.but when pulling vacuum I use 1/2 hoses for 12-14 hrs.sometimes longer.when I have a problem job that has had leaks in past I use copper.takes out the question ARE MY HOSES LEAKING?i have to get down typically below 300 microns and hold for 24 hrs.standing vac.

 

Any hose can leak, i am going to order a set of those stainless one though i triple evac not because im good but because im lazy. Triple evac cuts my time down from hours to minutes,,,,,,,,,sometimes.

 

appion j-mart had the vcrt's and hoses on sale for $99 1/2" hose with a 3/8 fitting and a 1/4 fitting. so far have worked great for me

 

Is that a nickname or is there a supplier in your area called j-mart?

 

J-mart = Johnstone

 

I was considering "building" my own kit from trutech tools for $450 but, I might stick around and see what other (and possibly cheaper) options are. With the bluvac, hoses, fittings and what not, it doesn't seem all too bad of a price though.

 

Conductance... Term used by the guys that DO vacuum on an industrial scale. At low pressures, there are very few molecules of gas or vapor and SIZE matters! The bigger in diameter and the shorter the conduit, the faster the sparse molecules can be moved along. I like the Appion evacuation set. BIG passageways and I like their vacuum pump with the change on the fly oil reservoir. Nice stuff.......

 

 

I just picked up tru blu hoses, haven't had an opportunity to use them yet, but I've heard nothing but excellent reviews of them

Sent from my SM-A516U using Tapatalk

 

I use two YJ black, heavy duty, vacuum rated, 3/8" hoses direct from vacuum pump to Appion core tools. On most any resi system it will pull down pretty fast. It really doesn't matter how much the hoses are permeable,(I mean it does matter in the sense that it will pull the vacuum down quickly), as they are valved off during the standing vacuum test anyway, so they're out of the loop. As long as my vacuum pump/hoses will pull down to a reasonable vacuum level, then I'm fine with it.