[jcrew4242]

what is the best way to pulling a vacuum on a AC system?
more than 1 pump at the same time?
put it down to 500?
micron gauge on each pump?
Share your idea

 

[mr_guy]

Make sure your gauge knobs are open, that's important

 

[Fred Smith]

you beat me to that gauge knobs open for sure !!!

 

[jcrew4242]

That is a good one.
I will keep both side open for sure

 

[gravity]

1 pump with clean oil

2 - 1/2" vacuum hoses

2 - vacuum rated core tools

1 - good micron gauge.

Use the gas ballast until about 10000 microns. Then close the gas ballast.

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[Realmsteel]

I'm very new to this, but I just use a single pump with fresh oil, 3/8 vacuum hose through the gauge set with the valves open(Ha), YJ core removal tools, BluVac micron gauge.
Takes a little while, but so far no problems.
If you are having problems, I'd say check your vac pump.
I try to take care of my tools so they last.

 

[westshore]

Micron gauge connected to side port of one of the core removal tools; you want the gauge to be as far from the pump as possible. I typically evacuate through both service valve ports and when near 500 microns close off the ball valve of the core tool with the micron gauge. Then the gauge is seeing vacuum in the refrigeration cirrcuit and not the vacuum hose. The gauge reading will go up initially but then should stabilize and start declining again. Keep evacuating to under 500.

Break with nitrogen to 0 psig and evacuate 2 more times if you're a real perfectionist, and have the time.

 

[jcrew4242]

I saw more of my co-worker are doing the vacuum without a micron gauge.
most of them are ok without it. some of them have differ point of views.
As what i learned when i was in school, vacuum with a micron gauge is a " must"

 

[gravity]

Do they charge the unit beer can cold too?

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[incontrol]

Gauge is a 'must' if you want to guarantee no leaks. Get those schraeder depressors out of your hoses. I can't tell you how many dumb clucks I've seen trying to evacuate through schraeders and hoses with depressors. Once you get it to hold for a quarter-half hour shoot some gas in to bring up to atmospheric, put your cores back in and continue charging. We used to boil mercury in the chamber of a mass spectrometer I ran to create a vacuum. I don't remember the units but we're talking a zillionth of a micron.

 

[Dr Love]

Do they charge the unit beer can cold too?

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You and captaincompressor...... LOL

 

[Yuma]

Gravity hit it on the head in post #5!

Yuma,

 

[hvacvegas]

What are you pumping down? Residential? 200ton units?

Residential, I think people using all the crazy apion stuff is a bit overboard.

 

[gravity]

What are you pumping down? Residential? 200ton units?

Residential, I think people using all the crazy apion stuff is a bit overboard.

In residential or commercial, im thinking efficiency and simplicity.

How many newer guys or even us more experienced guys chase ghost leaks or possible moisture?

Eliminating these potentials should be priority. Using manifolds can leak and lead you to a chase.

Using 2 hoses with no depressors and cores speeds up evacuation and eliminates most ghost leaks. You could even use 2 - 1/4" hoses with no depressors straight to the pump.

IMO bypassing a manifold should be a must. It will speed up the process and solve most vacuum troubles.

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[AARONHVAC]

Hi Gravity

Sorry but I'm new here so bare with me lol, Ive been looking for awhile on pulling a good vac!
At the moment I've got a Mastercool Vac pump 10CFM with a 1/2 port and 2 1/4 ports
Ive got normal set of 2way refco gauges

My set up is this i go from my vac pump to my manifold set 1/4 hoses, then from my manifold set to the unit, using core removal tools with my vac gauge attached.

I struggle to get a good vacume i need some help and advice on my set up. I want to buy some proper vacuum hoses but i don't know anywhere that sell them 1/4 to 1/4 with a large bore... does anyone do this?

or would it be best to come of my 1/2 port on my vac pump and then go onto my manifold so i need a 1/2 to 1/4 vac hose ?

ive also seen a lot of people not use manifolds when evacuating and just go from the vac pump direct to the units ?

i just want a good set up lol so many people have different ways but my set up at the moment is poor i admit i just want some advice....

any suggestions please?

 

[jtrammel]

With your pump I'd get 1- 1/2 " hose with 1/4" and 1/2" ends and 1-3/8" or 1/2" hose with 1/4" ends. 2- vcrts and go directly to pump. Micron guage on the side port of one of the vcrts.

 

[jtrammel]

https://www.trutechtools.com/Vacuum

 

[gravity]

I would get a 1/2" to 3/8" reducer and a 1/4" to 3/8" reducer for your pump. Then get a little can of liqui-vac to seal the reducers at the pump. Pickup a bottle of nylog and 2 - Appion hoses. Links below. Also, make sure any hoses for vacuum use say they are vacuum rated. The fittings could be picked up at Aireco.

http://www.trutechtools.com/Hoses_c_1292.html

http://fierychill.com/media/catalog...e95/l/i/liqui-vac-high-vacuum-sealant-thermal-engineering-airserco-4036-4oz.jpg

http://www.trutechtools.com/Nylog-Blue_p_1987.html



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[AARONHVAC]

Would this be a good set up?

 

[AARONHVAC]

1/2 onto the Vac pump, then tee off with two 3/8 to 1/4 hoses to the VCRT. No manifold set up