2 Hose Vacuum Pump Procedure VS 1 Hose Vacuum Pump Setup for HVAC! 

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As a third year hvac installer/tech, I can confidently say with your videos and now book, my work has improved and now I’m the busiest guy in the company. Thank you for all your work in helping me improve and look forward to gaining more knowledge from your guidance.

Brother you’re an asset to the HVAC community. I’ve purchased your e-book and the flash cards not to mention your videos here are my go to on RU-vid. Big thanks man 🤙🏼

Love the DETAIL that you include in your demonstrations! And EXPLANATIONS for everything...wonderful! Thanks very much!

35 years ac mechanic,still learning,thanks for post

You are the hvac man! You help me as well as so many others so much. You explain everything so well. I would honestly recommend someone using your videos and working in the field rather than going to college! Got a few buddies that went the hvac school route. Definitely not trying to knock it but from what I’ve heard the lessons are kinda dragged out with some useless info. Not your videos tho! You tell people just what they need to know! Thanks man

Craig, Thanks for such a great HVAC training channel. Just ordered your book. Keep up the good work!

Craig. Excellent teaching my friend. I wish that we had you for our young apprentices at our training center. Have a great weekend. God bless.

Hey Craig I just wanted to thank you! Today I tried your vacuum method in a large Mitsubishi VRF system… I got it down to target vacuum in no time!

This video has helped me out a lot. I do commercial refrigeration and hvac and I was taught to pull the vacuum through the gauges and that takes forever to even get down. Now I’m going to use what I’ve learned from this and put it towards refrigeration side of things for single units and heaven forbid rack refrigeration because we all know how some companies are.

This man is full of knowledge. That is how I do my vacuum procedures at the properly I'm a Supervisor. I have been in the hvac business for more then 20 years and there is always something new to learn. Thank Sir for spreading your knowledge, something that not too many experienced techs are willing to do.

Great job explaining! This is so ctitical,especially in refrigeration applications! I certainly hope more technicians and contractors used this method with 2 hose or ( at least 1/2 " hose applications) ,for pulling a vaccumn.. Just go out and buy a couple core removal tools and practice doing this. You will notice less call backs, And YES....no evaporator coil leaking due to moisture in system after 3-5 years! Thank you for all your time and sharing correct procedures on A/C and refrigeration service procedures! Tremendous asset your videos! Bryan Tyler Refrigeration Helotes,Texas

I will buy your book mr. AC service you have been doing a great job on explaining the procedures. Much appreciate it.

That tip about releasing the air bubble from the ball valve in the valve core removal tool - sooooo good !

I enjoyed signing the song in this video ! Thanks Craig you’re a true master and great teacher

Great videos. I bought the paperback training book.packed full of good info. Thankyou

Excellent video!!!!! Now sure how I missed this one. Have seen all your videos. You are the best!

Pleasure to watch, a real pro, thank you so much for your videos.

Great info, thanks, also enjoyed listening to you on Bryan's podcast recently. 👍

Just learning, so this was spot on. Thanks.

One suggestion = I always set my vac gauge upright, never upside-down, for the reason you stated: oil contamination. You never know when the power trips to your pump and the potential of oil sucking back up the lines

Thanks for the excellent demonstration and info

Stellar video productions, you clearly have a gift for teaching. My Robinair Vacuum pump has only a 1/4" flare input. It'd be nice to change to a 3/8" & 1/4" flare Tee to enable that vacuum setup.

The videos are priceless and the comments are too .

Your micron gauge is closer to the pump on the 2 hose setup, thus reading a deeper vacuum than your gauge on rhe 1 hose setup. Neither way is wrong per se, but technically with the gauge farthest away from the vacuum you will get the most accurate reading.

Excellent, teacher.

If only I saw this before yesterday. And I have your book. Great video. 😋

I use 2- 3/8x 1/2x 1/4 hoses but i don’t use the third core removal tool. Nice tip!!

Nice video once again! Other than for a couple of "mistakes" already pointed out, I myself wouldn't worry about the de minimis amount of oxygen prior to purging with nitrogen. The vacuum pump is more than capable of getting it out.

Another excellent video. Thank you ❤

As always you have great HVAC training videos I recommend your channel to the students at our local HVAC college program. Great demonstration reference video don’t understand why anybody would even think of using a single hose my dad started me off and HVAC when I was a kid back in the 70s it was always double hose. And my dad taught me to make up my own vacuum lines out of soft copper with no hoses to pull a very deep vacuum and my dad was taught by an older gentleman in refrigeration when he was young. About the only difference my dad‘s old micron gauge that I learned Don has a child you 6 to 8D cell batteries only had several hours of run time before the batteries were dead took about five minutes to warm up and almost another five minutes to calibrate before it was ready to use and it was temperature sensitive. All these methods and knowledge I know for a fact were around before Kennedy was president. Keep up the great videos.

awesome video, thanks

The 2 hose with 3 core removes is a great setup. I took Craig's tip about this awhile ago, and never really have any more problems with pulling a vacuum

Good video, I especially like it where you are not promoting a certain vacuum hose (the color of hose is blue). I have been using Yellow Jacket 5 CFM Bullet Vacuum Pump, (1) 3/8” Hose, 1 ball valve, Apion Core removal tool and a JB micron Gauge set up over 10 years. That set up has gave me 109-125 microns on new system with a decay rate around 10-20 microns in 20 minutes. Now all I see is that to do a ultimate vacuum is you must have these $400 blue hoses with 8CFM or more vacuum pumps.

This man is AC BOSS!

Great Video!

I am just putting this out there. I have no doubt that this is a much faster way to pump down the system. And I in no way am bashing on anyone'smethods. You really know your stuff and I wish I had the years of experience and the head full of knowledge in hvac as you have. I am amazed at your ability in the trade. That said, I just am surprised that I haven't read anyone saying what I think every time I see one of these videos on how fast a system can be pulled down. I have no need of pumping it down extremely fast. I have several other things that need to be done that I can be doing while it's pumping down. I still do it the old way with the cores in and the manifold hooked up. When I'm done pumping down I don't have to worry about not being able to get the core back in place or fighting them (sometimes it can be a fight). I don't have to reattach my manifold hoses in order make sure the SH or SC is spot on and to hook up to a tank if I need to add refrigerant to top off the system. I am able to be hooking up wiring, taking the trash away, cleaning up tools, etc, etc. while it's pumping down. I really don't need for it to pump down fast. I have efficient time management so it works out fine. I'm looking forward to seeing what others have to say to prove that I'm an idiot. Believe me, I know I've got more to learn. I learn more every week in this business. And I appreciate anything you all have to teach me. So please, educate me on what it is I'm missing in the way I do it. Btw, I'm older. 53. And I've learned from a couple of very smart, very experienced trainers. And I've learned from newbies with a fresh approach. I'm willing to learn new things from anyone. Please don't attack me. But please do instruct and enlighten me. What am I missing?

I appreciate this video very much 👍👍. Thank you

Excellent!

Awesome video thank you sir appreciate

Very nice video.

Good Video. One suggestion. Get some stick on magnets for the back of the scale readout.

thanks, partner for sharing!!!!!

شكرا اخي تعلمنا منك الكثير

Thanks 👍🌹

I never have seen you before you look great!!!!

Great video 👍 thanks for the tips ,will try the 2 hose setup on my next repair

Thanks

Thank you for making such a detailed video! Would you recommend this same method with an automotive air conditioning system? I need to replace the ac condenser in my son's car and would like my repair job to be as professional as possible. Thanks!!

Craig, another informative video. A great demonstration. In your opinion, do the core removal tools have to be vacuum rated or can other core removal tools be used for this procedure?

Brilliant workmanship. After pulling the vacuum and starting the 10 min vacuum test, what would you recommend the allowance is for the microns tho rise up too ?

hahaha i love the fact he has the gloves on i remember 20 yrs ago my tech school teching me about that but in real world commercial you cant for the most part do that.

Hello Craig,in school they taught me that we don't take out the valve cores to do the vacuum beacause the time it takes unhook the service hose and put it back the valves cores it gets humidity and air into the line set,,how is tha true?,thanks for the great videos and i got your book already very nice HVAC book.

Can’t you just put the txv in hot water to keep it open for more flow? With the single hose setup

WOOOOOOW.... I am absolutely shocked by the difference in time a single hose set up takes compared to the 2 hose.. I have singlehandedly witnessed the frustrations accompanied by the micron gauge shutting off for the 3rd time 45 minutes in, and hovering at 1,000, everyone just sitting there wondering why lol... I would much rather buy the extra core removal tools and hose and save myself 50 minutes

thank s for the video i have to put in a 1200 btu GREE

Craig...another awesome video! Is this approach and these procedures similar when working on a ductless system?

Great educational video. Do u have any video like “ vacuum line set and condenser unit”. If the system it’s contaminated we need to recovery all Freon to a self container and do a vacuum on the line set and condenser, am I right?? Thanks

Great vid, I've been using your method for a couple years now but recently i've been having issues with pump oil being drawn back into the hoses. I'm not sure why, any thoughts? I isolate the system before i turn off the pump.

Really appreciate the videos and the book is awesome. However, I’m having trouble removing the core with the Appion tool. It won’t grab the core. Any suggestions?

I don’t envy you installers one bit.

Thank you for the knowledge. Would you ever use a little Nylog on the new value core gasket?

Gran video y muy bien explicado, la verdad mi inglés es malicioso y no puedo entender muy bien lo que explicas pero dado que llevo varios años en el rubro me doy cuenta... Solo tengo una pregunta... No se puede hacer vacío tanto por alta y por baja para ahorrar más tiempo en el proceso, o solo lo hiciste así para el video ?

thank you very much for the video ... i have 2 questions pleasev;1. what happens to the oil in the system is it sucked out while the vakkum pump is running if not why? 2. why did you open and close the hoses many times ?......thank you

What do you think about using sman480 built in micron gauge to pull vacuum instead of extra valve core removal tool and buying separate micron gauge. Thanks

Do you have a video on single hose filling?

What would you recommend for lennox units? You can't really fit the core removal tool in the space that they give you.

Great video👍, i have a question, dont u tighten with a plier so its seal?

Ok i have a question in reguards to something our ears caught during your video....say we braze the lineset in.... pressure test it and no leaks at recommended psi.....then this is the question....i have a dry nitrogen bottle thats about 5 feet tall and full not sure what the CF is on it but we put a nitrogen hose on the service port of high side we call it and use a valve on the other service port hook up the nitrogen bottle and purge nitrogen thru the lineset for a good hour and half then close it off as well as the valve thats on the other service port in order to keep anything from entering the sysem at this point how much moisture "from your knowledge" would be in the system at that time? Keep in mind no vacuum has been put on it yet. Thanx for any info we certainly appreciate it i will elaborate more when you reply this is very interesting.

what type of coupler are you using on your vacuum pump. I traditionally used 1/4 inch hoses but removed the schrader valves. I want move to bigger hoses saves me time. How do you store those hoses isnt it bad to have them exposed to moisture when they have no caps?

Teacher I was able to Recognized you only because your voice Jajajaj you look different I tough was another tech

Could you leave the fan running the whole time while performing the vacuum and charge, or would it be better to leave it off?

There is a depressor in the cps vacuum gauge that you did not mention. I assume you leave it in?

When breaking vac with nitrogen are you not supposed to leave it for an hour to help with removal of moisture? Also with the 2 stage pump I have the manufacture says that triple evac is not required just use gas ballast till 10thousand and let er buck down

Thank you for this video. please someone should prescribe for me the type of Vacuum pump I should buy and the list of it associated tools.

7:27 so you didn't purge the line of air before opening the valve to break vacuum with the n2?

Using a one hose setup pulling through the low side, is there ever a problem where the low and the high side isolate themselves within the txv or so let’s say and you only end up pulling a vacuum on half the system if that makes sense? Thanks!

Would that 3oz you added be enough to create “positive pressure” ? If you put the valve core back in after you add the 3oz but before you release the system refrigerant, is that okay? Or did i mess up my vacuum?

I’m new to the field. I’m using the Fieldpiece VP67 pump and 2 appion 1/2” vacuum hoses with the CPS micron gauge. I don’t have the core removal tool yet. My question is after doing a compressor changeout and getting down to 500 microns, turning the pump off and waiting 10 minutes for decay test. Is it then good to just remove the vacuum hoses from the ports while pump isn’t running and proceed with charging the system? It seemed like as I removed the hose I heard pressure returning into the system and the vacuum had broken.

Wouldn't you normally charge the system with the tank upside down if it has liquid refrigerant inside? If there's only vapor inside why turn it upside down? Or, is that only for cases of "topping-off?"

How does one remove the valve core depressor from the 1/4" hose?

Is it still manditory for every individual be EPA 608 certified to do any type of refrigerant vacuum or service on every type of HVAC systems?

Great video. But being that r22 is being phased out, it would have been cool to see the procedure with 410a. With R410A being a blend, would you still use gas for the initial charge after vacuuming?

Can you explain to me how you can put a vacuum on the system when its under pressure? Im not understanding that.

I’m sorry I missed the part on vacuum pump. Is that a single or two stage pump? Thanks

wow the ad on youtube just start before the micron gauge shut off , double suspense ...

Is it possible for refrigerant to flow without the compressor running?

Somehow I missed? Did you purge/ bleed the nitrogen hose before opening the valve into the system?

What about using 2 core removal tools and using a regular extra ball Valve for the vacuum gauge. Just wondering cuz the Ball valve is $15 compared to $50

Hey Craig I recently purchased BluVac+ micro gauge which advertises sensor withstands overpressure up to 500 PSI, do I still need 3 valve core removal setup or I can break the vacuum with this micron gauge connected ?

The AC is not cool because moisture and air trap in the system? There is refrigerant in the system. Do I need to recover the refrigerant first before doing the vacuum?

What brand tool is the core remover?

Wouldn’t you have to add the r22 thru vapor line?

Why sometimes after finishing my vaccumm down to 500 I turn the vaccumm off and the micron gauge goes back to -29.99 and stays there . Shouldnt it stay at 500 o raise a bit but not back to -29.99? Please advised. Thank you !!!!

What size is that red hose Do you have a list of the tools and hose been used ?

What T is that on the vacuum pump? Thanks

Mr. Craig. I was told that if you pull a vacuum too quickly that it could cause the line set to ice up inside. Therefore possibly leaving moisture in the lineset / system. Is this correct?

If you do just a pump down on the condenser and leave refrigerant in the condenser and replace just the evaporator, do you need to perform a 2 hose vacuum procedure on just the line set and evaporator? And second question, if you replace both the condenser and evaporator, normally the new condenser is filled with nitrogen on a R-410 unit, do you still perform a 2 hose vacuum procedure? Thanks

Wait so it takes like 1 minute with two hoses and like 1 hour with just one hose?

How do you clean a vacuum gauge? I even took the end off and don’t see anything to clean there’s just a hole there