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

In this HVAC Training Video, I show How to set up and Perform a Vacuum on an Air Conditioner. I time how long it takes to perform a vacuum using the two hose method and then I break the vacuum with nitrogen to 0 psi. I then time how long it takes to perform a vacuum using the single vacuum hose set up and then I break the vacuum with refrigerant from the bottle. I use valve core removal tools to remove the Schrader valves during the vacuum. Supervision is needed by a licensed HVACR Tech while performing tasks as Experience and Apprenticeship garners Wisdom and Safety.
Tools Used In The Video
CPS 4 CFM Vacuum Pump - amzn.to/2DxgPwY
CPS Vacuum Micron Gauge - amzn.to/2v1nM3O
Appion Valve Core Removal Tool - amzn.to/2uYr8WL
Refrigerant hoses with valves amzn.to/2aBumVI
SDMN5 Dual Digital Water Column Manometer: amzn.to/2x176im
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⚠️ Disclaimer:
Information in this video is intended for educational purposes only. Any work related to the topics in this video should be performed by licensed technicians or by apprentices under the supervision of licensed technicians. AC Service Tech LLC is not responsible for any possible damages or injuries caused by the use or misuse of any information provided. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
#hvacr #hvacr #hvactrainingvideos #hvactraining #hvactraining101 #acservice #acservicetech #oil #vacuumpump #2hose #hose #airhandler #heatpump #acunit #airconditioner
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[@acservicetechchannel]

The E-Book and Paperback at our Website: www.acservicetech.com/the-book The Paperback at Amazon: www.amazon.com/shop/acservicetech Support the Channel- www.patreon.com/acservicetech Tool List- www.amazon.com/shop/acservicetech For those that are looking for the tools used in the videos: (Linked Below) Vacuum Tools: JB 6 CFM Vacuum Pump - amzn.to/2nqbvo8 CPS 4 CFM Vacuum Pump - amzn.to/2DxgPwY Appion Valve Core Removal Tool - amzn.to/2uYr8WL Appion Blue 3/8" to 1/4" Vacuum Hose - amzn.to/2uYlVyc Appion Red 3/8" to 1/4" Vacuum Hose - amzn.to/2uYg6Ro Yellow Jacket 1/4" by 1/4" 3’ hose - amzn.to/2umtcod Appion 1/4" by 1/4" and 3/8” hose - amzn.to/2Zyxzx9 Uniweld 1/4" by 1/4" 2’ hose - amzn.to/2GFov1Y CPS Vacuum Micron Gauge - amzn.to/2v1nM3O Supco Vacuum Micron Gauge - amzn.to/2v1JRiA JB Vacuum Pump Oil - amzn.to/2mGrlXy Checking the Charge: Yellow Jacket Refrigerant Gauge Set amzn.to/2aenwTq Refrigerant hoses with valves amzn.to/2aBumVI Yellow Jacket Gauge set & hoses amzn.to/2vLVkV9 Yellow Jacket 4 Port Manifold w Hoses amzn.to/2BkuGIq Digital Refrigerant Scale amzn.to/2b9oXYl Ratcheting Service Wrench amzn.to/2dGV4Nh FieldpieceSMAN360 Digital Manifold Set amzn.to/2BdoaD4 FieldpieceSMAN460 Digital Manifold Set amzn.to/2nB4Fe6 Compact Ball Valve for Refrigerant Hose amzn.to/2KUisW8 QuickDisconnect 90 for refrigerant hose amzn.to/2MMtVcg RectorSeal Bubble Gas Leak Detector amzn.to/2ckWACn Fieldpiece ST4 Dual Temp Meter amzn.to/2wc1ME3 Fieldpiece Bead K Type Temp Sensor amzn.to/2DBwKfs Fieldpiece Wet Bulb Temp Sensor amzn.to/2RRI7Tw Fieldpiece TC24 Temp Clamp amzn.to/2qHLyjZ Flaring Tools: Yellow Jacket Flaring Tool - amzn.to/2OBxGlM Spin Flaring Bits 1/4", 3/8", 1/2", 5/8", 3/4"- amzn.to/31BCs8Z Yellow Jacket Flaring Tool with Set Depth - amzn.to/2QIKsQH Yellow Jacket Torque Wrench - amzn.to/2NRR68Q Uniweld Swage and Flare Kit- amzn.to/2T55jyn Nylog - amzn.to/2MLJcch Ridgid Tubing Cutter - amzn.to/2DnjjR1 Wolverine Tube Reamer - amzn.to/2QGLyMV Swaging Tools: Manual Copper Tube Swage/Expander- amzn.to/2WRPa1M Spin Swaging Bits 1/4" to 7/8" for the Drill- amzn.to/2YQwwqS Uniweld Hydraulic Swaging Tool- amzn.to/2MlrI8m Uniweld Swage and Flare Kit- amzn.to/2T55jyn Uniweld Hammer Swage kit- amzn.to/2CzWMMU Uniweld 3/4" Hammer Swage- amzn.to/2CzXsSs Uniweld 7/8" Hammer Swage- amzn.to/2Mja5WE Uniweld Multi-Size Hammer Swage- amzn.to/2T3Cx1b Brazing Tools: Air Acetylene Torch setup - amzn.to/2aQalsb 15% Silver Brazing Rods - amzn.to/2gVLyLc Uniweld Cap-N-Hook and #2 Tip Oxy Acetylene Torch Setup - amzn.to/2STp3Fe Ameriflame Oxy Acetylene Torch Setup #1 &#2 Tip - amzn.to/2SRm3JF #2 Tip for Oxy Acetylene Torch - amzn.to/2SPDaeD Cap-N-Hook Tip for Oxy Acetylene Setup - amzn.to/2MbhpUk 40cu B Tank to 10cu MC Tank Acetylene Tank Fitting - amzn.to/2GxZZPi Nitrogen Regulator - amzn.to/2bXdR5f Uniweld NitroVue Flow Regulator - amzn.to/2GnsaAo Uniweld Nitrogen Flow Meter - amzn.to/2brvoBg Bernzomatic Trigger Start Lighter Propane/Mapp Gas - amzn.to/2vit0cv Uniweld Soft Flame Sweating Torch Setup for Acetylene - amzn.to/2DyzRD8 Flint Spark Ignitor - amzn.to/2L3P2u9 Stay Brite #8 Silver Bearing Solder and Flux - amzn.to/2XIDJsY Aluminum Braze Rods - amzn.to/2IGNMu Nitrogen: Uniweld NitroVue Flow Regulator- amzn.to/2GnsaAo Uniweld Nitrogen Flow Meter amzn.to/2brvoBg Nitrogen Regulator amzn.to/2bXdR5f Service Valve & Port Access: RectorSeal Bubble Gas Leak Detector - amzn.to/2ckWACn 25 Valve Cores - amzn.to/2L37UJU 25 ¼” Brass Port Caps with rubber O-rings - amzn.to/2GIOdD2 Brass Valve Core Tool which holds 3 valve cores - amzn.to/2GFEbm2 Valve Core Torque Wrench - amzn.to/2GHiLoD Locking Cap Universal Lock/Unlock Tool - amzn.to/2GGAoVp Locking caps - amzn.to/2GFXZ8A Ratcheting Service Wrench amzn.to/2dGV4Nh Yellow Jacket Sealright 90 Coupler- amzn.to/2LsU1V7 Yellow Jacket 1pk Compact Ball Valve- amzn.to/2uXdF18 Yellow Jacket 3pk Compact Ball Valve- amzn.to/2AiKfQe Thumb Screw Valve Core Depressor with Backseat- amzn.to/2mR0sCL Electrical Diagnosis: UEI DL389 Multimeter amzn.to/2xAdaJf UEI DL479 Multimeter with temp sensor amzn.to/2jtsUbJ Magnet Jumpers- amzn.to/2PyKPQZ Alligator Jumpers- amzn.to/2PxqJXn Irwin Wire Stripper/Cutter/Crimper amzn.to/2dGTj2V Leak Detection: Accutrak VPE Ultrasonic Leak Detector amzn.to/2nFYKVe Accutrak VPE-GN Ultrasonic Leak Detector amzn.to/2Zy4IZP RectorSeal Bubble Gas Leak Detector - amzn.to/2ckWACn Other tool links can be found in the video description section. Shop through Amazon! Your Purchases through Amazon provide a means for channels such as mine to earn advertising fees from all purchases after clicking through. Prices are the same as normal- www.amazon.com/shop/acservicetech

[@ApartmentMaintenancePro]

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

[@Silky_boi]

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.

[@acservicetechchannel]

That is really awesome to hear! Thanks a lot for letting me know!

[@mikecarignan7002]

35 years ac mechanic,still learning,thanks for post

[@acservicetechchannel]

Thanks for watching!

[@inertiaspinner555]

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 KZbin. Big thanks man 🤙🏼

[@briancrane7634]

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

[@acservicetechchannel]

Thanks a lot Brian!

[@arodandjeter1]

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

[@bradykice8759]

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.

[@frankieg40]

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.

[@FlyEaglesFly19111]

One thing wrong.. where was the oil change to the vacuum pump. Oil breaks down fast.. especially systems in operation previous but recovered or pumped down to make leak repairs. Even for newer systems where those choose not to keep nitrogen on or use to purge will have moisture to deal with.

[@acservicetechchannel]

I did flow nitrogen through the system at 3 cfh while brazing so it was purged some before starting but it would have been nice to do an oil change for the second vac. This would have given it the best chance at making time. I changed the oil after the second vac was done, however the second vacuum would still have taken quite a bit of time, thanks!

[@joosman17]

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!

[@blazeeisner9620]

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.

[@acservicetechchannel]

Yeah NJ is pretty far away from California! Thanks Blaze!

[@RRada-kx8ip]

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

[@acservicetechchannel]

Awesome, please let me know what you think of it after reading!

[@xraybravo7180]

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

[@acservicetechchannel]

Thank you very much and I would love to hear what you think of the book after reading it!

[@bryantylerservices]

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

[@acservicetechchannel]

Thanks a lot Joseph!

[@billsmith3020]

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

[@user-fn1dw8pu4y]

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

[@acservicetechchannel]

Glad that you enjoyed it!

[@HowToDoitright]

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

[@acservicetechchannel]

Thank you for your support!

[@genemyers834]

The videos are priceless and the comments are too .

[@acservicetechchannel]

Thanks a lot Gene!

[@deseremere]

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

[@manueldacosta6539]

Another excellent video. Thank you ❤

[@heavyequipmentiv]

Just learning, so this was spot on. Thanks.

[@ThotBonker]

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.

[@Froggability]

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

[@runwayray]

Thanks for the excellent demonstration and info

[@acservicetechchannel]

Thank you for watching and your support!

[@kevinJmadsen]

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.

[@luiselizalde6757]

Excellent, teacher.

[@acservicetechchannel]

Thanks Luis!

[@bradleymorey]

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

[@acservicetechchannel]

Awesome and thanks for letting me know!

[@noahoyeah]

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

[@eevanskiteboards]

awesome video, thanks

[@Stevenowski]

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.

[@Matt-nr5re]

No mistake here. He is re evacuating the system with the one hose method

[@thefred0215]

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

[@acservicetechchannel]

Awesome, thanks Freddy!

[@andysullivan7226]

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

[@acservicetechchannel]

Awesome to hear!

[@williambell884]

Agreed. Been using Craig’s method since I saw his first video on using 3 valve core removal tools. Did not want to purchase another core removal tool, but it is what it is. Never had any more vacuum issues. As a former High School teacher, he is an excellent teacher. I learned HVAC at age 60. He helped me grasp the field experience with his videos. Having book knowledge is helpful. Having both is the best.

[@craigerickson8712]

@@williambell884 im have way through trade school at 37 years old . New and green to hvac . Craig has great videos and I've just ordered his book . How has the trade been to you? And the learning curve ?

[@williambell884]

Craig Erickson At age 60 the learning curve was steep. As we age, our ability to grasp and retain information diminishes. However, it is a great field. My son will be in it for 3 tears in September. Last year he made $83, 000 in 10.5 months. If your willing to work and learn you can make money.

[@andysullivan7226]

@@craigerickson8712 I'm 42, and have been a tech for almost 4 years now. Love the trade but some companies make the trade hard then it is. Too many want that commission dollars and dont care about quality of workmanship or the systems.

[@Honestandtruth]

I appreciate this video very much 👍👍. Thank you

[@acservicetechchannel]

Glad it was helpful! Thank you for watching!

[@epcortek11]

This man is AC BOSS!

[@acservicetechchannel]

Glad to help Jamie!

[@MJ-iy4fb]

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

[@victorvillafane252]

Awesome video thank you sir appreciate

[@acservicetechchannel]

Thanks Victor!

[@Thoroair]

Great Video!

[@acservicetechchannel]

Thanks a lot Andy!

[@djosbun]

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!!

[@woodygotem]

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

[@r.s.1348]

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?

[@lancerudy9934]

Very nice video.

[@acservicetechchannel]

Thanks a lot Lance!

[@peterhodgkins6985]

Excellent!

[@acservicetechchannel]

Glad to help!

[@coldfinger459sub0]

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.

[@acservicetechchannel]

Very nice and thanks for letting the younger techs know! I am trying to get the book into the hands of the younger techs at schools so they have not only the theory but also the procedures step by step, and why some procedures are better than other ones, thanks!

[@amersingh2557]

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 ?

[@superiorcomfortheatingairl3373]

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.

[@acservicetechchannel]

Ha ha, yeah I try to show the procedures with tools that the newer techs will be able to get their hands on. Otherwise I am not really teaching new techs and those in school at all since they can't afford things like that! Thanks!

[@jimbola77]

thanks, partner for sharing!!!!!

[@acservicetechchannel]

Glad to help!

[@user-kt2hb8xr3p]

شكرا اخي تعلمنا منك الكثير

[@michaelstephenson5523]

علي الشيخ was

[@user-kt2hb8xr3p]

@@michaelstephenson5523 Thank you, brother, we learned a lot from you

[@acservicetechchannel]

Thanks to both of you and glad to help! شكرا لكما وسعداء للمساعدة!

[@jimbola77]

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

[@acservicetechchannel]

Ha ha yeah sorry about the face ha ha! Its what I was born with!

[@luis2012174]

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.

[@MrScottalicious]

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.

[@yepper1165]

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?

[@RangkapSelari]

I also do it that way but two things, 1) like he mentioned the manifolds themselves can have a leak 2) those large systems can take too long pulling the vacuum when the core (schrader) valve is in

[@yepper1165]

@@RangkapSelari Thanks for the input. I didn't think of the manifolds leaking. And I just do residential systems. Mostly 1.5 to 2.5 ton systems. Biggest are 3.5 ton. So not an issue for me. But good points you made there. Thanks!

[@Dylan237tyr5]

It sounds like you are mostly installing new systems where pulling a vacuum isn't very hard. If you're repairing an older system they will have more oil and pulling a vacuum (especially on the whole system including the condenser) can take FOREVER. I've waited hours and hours for vacuums to pull on used systems and that's where techniques like this really come in handy.

[@yepper1165]

@@Dylan237tyr5 That makes sense. Thank you for your input!

[@bigant8231]

Thanks

[@acservicetechchannel]

I appreciate your comments Big Ant!

[@jamalbadhafari2634]

Thanks 👍🌹

[@acservicetechchannel]

Glad to help!

[@frankhernandez4476]

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

[@acservicetechchannel]

Absolutely, really saves time, thanks!

[@marcosborba1030]

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

[@andrewjohnson1640]

That is a thing. We never know if previous tech(s) purged their hose('s) before adding refrigerant or how well they kept their hoses protected from solid precipitation (carrying charge hose with uncapped open ends facing up) before adjusting SC with Bluetooth or analog gauges). High side pressure fluttering after pressure stabilization does not always indicate presence of non condensable gas. And so, experience and best practices per what we see just adds questions, answers and comments from others until we adjust and and settle on a method while continually learning and fine tuning. This guy is doing a great service to the world. Wish I saw his videos before I was taught "just listen for the vacuum pump picth to change and the vacuum is probably good" or "you don't need no low flow while brazing".

[@CappyCraigZ]

I don’t envy you installers one bit.

[@jeromehodge3007]

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?

[@acservicetechchannel]

So if the rubber gasket is squished onto the port too tight it will close off the hole on the inside of it and the valve core rod will loose the valve core at that point. The gasket needs to be sealed at the port when removing the core from a pressurized system but not squished, thanks!

[@brianbean7024]

Do you have a video on single hose filling?

[@dc-wp8oc]

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

[@acservicetechchannel]

Yes the single hose setup is, thanks!

[@johnnynguyen3838]

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

[@chrisspanyer1525]

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

[@jondoe820]

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

[@martinlopez1513]

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?

[@philoso377]

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

[@earthisheart6797]

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

[@acservicetechchannel]

No I wouldn't. We rarely have any problem with that part leaking on the teflon that sits in the port. It is also easy enough to replace without loosing the charge when using a valve core removal tool, thanks!

[@earthisheart6797]

@@acservicetechchannel - Thank you for the info and reply.

[@jacobwood7618]

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?

[@thedavesofourlives1]

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

[@pofpof1527]

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.

[@christopherwasmuth3678]

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

[@samfink8942]

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!

[@fourfortyroadrunner6701]

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

[@mrautoguy8419]

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

[@baylortaylor6378]

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

[@fesalmodi5297]

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

[@acservicetechchannel]

1 Oil does not get removed from the system during a vacuum. 2 sometimes there is air trapped around the ball valve of the valve core removal tool. I go to great length explaining all of this in my book the "Refrigerant Charging and Service Procedures for Air Conditioning" and I have the full outline posted at www.acservicetech.com for those who want to see whats inside, thanks!

[@cristianrozadilla2783]

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 ?

[@acservicetechchannel]

Acabo de usar el traductor de Google. Siempre uso la configuración de dos mangueras y mis aspiradoras solo tardan entre 2 y 13 minutos en sistemas que van desde sistemas divididos estándar de 1,5 a 5 toneladas. Solo hice la aspiradora larga con una sola manguera para el video, ¡gracias!

[@cristianrozadilla2783]

@@acservicetechchannel gracias a ti por responder , y tambien por enseñar,👍

[@CrownedOne2000]

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.

[@shaazy]

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

[@keepthinking2666]

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.

[@acservicetechchannel]

Always use gloves in the field. You don't want to get the oil mixed with refrigerant soaking into your hands, thanks

[@JonOffgrid]

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

[@acservicetechchannel]

Thank you for your support!

[@manuelherreros4609]

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

[@acservicetechchannel]

Never tighten with pliers. It won't leak unless the grommets are worn and need to be replaced, thanks!

[@kpk1630]

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?

[@Ggg77777]

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

[@tylertocci4395]

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

[@acservicetechchannel]

Are you able to get at least one valve core removal tool on? Sometimes on units, you may only be able to get to one and that will help, thanks!

[@JaffeJoFur]

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?"

[@acservicetechchannel]

In this video, it was more for those learning to remember to break the vacuum with refrigerant from the upside down bottle as if there was liquid in it, thanks!

[@workinprogress4579]

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?

[@FlyEaglesFly19111]

Actually they still sell dry units for R-22.. you just fill them according to the amount needed

[@workinprogress4579]

@@FlyEaglesFly19111 That was helpful, ty..

[@throttlebottle5906]

blended gasses always need to be drawn from the tank as a liquid(inverted tank), it could be throttled/valved to a very low rate, causing it to flash off into a gas before it enters the system, or use an actual flashing chamber for the purpose. you'd simply use a valve at the end of the hose from tank, to only allow a tiny amount at a time into the system, of course after purging the tank/hose/valve/connection at system

[@acservicetechchannel]

I usually recover that last 4 ounces of R-410A since it is only vapor at that point even when I know I pulled the rest out as a liquid so the mix should still be good. However, I always use the last of the R22 up breaking a vacuum since it is a single component refrigerant, thanks!

[@worldofstrings]

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?

[@acservicetechchannel]

Yes in the US, thanks!

[@jonathancardenas4387]

What brand tool is the core remover?

[@toyinorodare4072]

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.

[@acservicetechchannel]

I have the tools that i use linked at www.amazon.com/shop/acservicetech including the two vacuum pumps I use, thanks!

[@slairconditioningandheatin8663]

What T is that on the vacuum pump? Thanks

[@Josh-px6xb]

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

[@Froggability]

Correct, I don't use VCR tool, instead use ball valves and a tee

[@romanramirez7195]

I think that could work, good idea Josh

[@jevonriley7920]

Is a one stage vaccum pump good to use. Any one can answer ?

[@tomwardzala4240]

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 ?

[@acservicetechchannel]

Most vacuum gauges are rated for high pressure. However, I don't like to test them because they are sensitive for such a deep vacuum. Also the big thing is to not contaminate the vacuum sensor with the refrigerant oil from the system. If the sensor becomes contaminated, it won't read the next vacuum correctly and it is just easy enough to valve this component off, thanks!

[@tomwardzala4240]

AC Service Tech LLC Craig the response from the manufacturer to that question was: It is OK to keep the gauge connected while releasing gas into the evacuated system. The worst that could happen is oil gets in the sensor, but the gauge will tell you (it will say oil on the display). If this happens, just clean to sensor with isopropyl alcohol. Would you say just to be safe it would be better to get another core removal anyway ?

[@5822huron]

Why the nitrogen? Please explain. Thx

[@saulurena7681]

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

[@americanpie8059]

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?

[@acservicetechchannel]

Ron, no it is not, common misconception. You can confirm you have no ice during the 10 minute standing vacuum test. If the ice melts, the micron level will rise. Pull the vacuum fast to get it done efficiently and then test it during the 10 minute standing vacuum test, also referred to as the decay test. If you were concerned about ice, run the fan blower too in order to provide heat at the evap coil, thanks.

[@americanpie8059]

@@acservicetechchannel Thanks for the knowledge sir.

[@hvacemsca4696]

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

[@hvacemsca4696]

Never mind about the hose you’ve explained at 9:40

[@stevennahulak6768]

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

[@caru3257]

I'm going to say that you can use the setup regardless of what you replace.

[@acservicetechchannel]

Yes let the nitrogen exit and then perform your vacuum. If it is a system that once had oil in it, I blow 100psi of nitrogen from one side to the other for 5 seconds before vacuuming in order to blow the oil onto the inner walls of the tubing and then I do the two hose method, thanks!

[@mazakkam]

@@acservicetechchannel Craig to follow up on your last comment, would I be able to blow just 100psi of air from one side for 5 seconds on a system that once had R22 before vacuuming it, if I don't have nitrogen? I am installing a new condensor with R410a and a new evaporator while keeping the old line sets. Excellent video with clear detailed instructions! Thanks,

[@jondoe820]

@@mazakkam no I wouldn’t put any air in the system

[@jaydee2620]

Do you have to break the vacuum with Freon from a bottle or can you used the Freon contained in the condenser ??

[@SuperDanny1117]

I see what you are saying if it’s a new install yea you can just make sure those cores are in or you will have a few pounds of refrigerant blasting out at you haha and if that does happen don’t try to stop it you will burn your hand very bad

[@chinowong69]

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 !!!!

[@acservicetechchannel]

That would be close to a perfect vacuum so there must be something wrong with the micron gauge. Try cleaning the sensor maybe?

[@chinowong69]

@@acservicetechchannel thank you !!!!

[@TheOneshot78]

Clean the sensor with rubbing alcohol and let it evaporate. You should be good after that.

[@Froggability]

You have a leak in your setup most likely

[@Holydany]

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