HVAC Full Vacuum Procedure From Start to Finish!

In this HVACR Training Video, I go over how to Perform a Fast and Deep Vacuum for Dehydration of an Air Conditioning System. I go over the Pump, Hose, Valve Core Removal Tool, Micron Gauge Setup, and Step By Step Process to Complete this Procedure Effectively. I go over some hiccups along the way and how to deal with them. 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 #vacuum #vacuumprocedure #procedure
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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.

[@acservicetechchannel]

Tool List- www.amazon.com/shop/acservicetech Support- www.patreon.com/acservicetech For those that are looking for the tools used in the videos: (Linked Below) Here is a link to the JB 6 CFM Vacuum Pump amzn.to/2nqbvo8 Here is the link to the Appion Valve Core Removal Tool- amzn.to/2uYr8WL Here is the link to the CPS Vacuum Micron Gauge- amzn.to/2v1nM3O Here is the Link to the Appion Blue 3/8" to 1/4" Vacuum Hose- amzn.to/2uYlVyc Here is the Link to the Appion Red 3/8" to 1/4" Vacuum Hose- amzn.to/2uYg6Ro Here is the link to the Yellow Jacket 1/4" by 1/4" heavy duty hose straight- amzn.to/2umtcod Here is a link for RectorSeal Bubble Gas Leak Detector amzn.to/2ckWACn Here is the link to the pack of 25 C&D valve cores- amzn.to/2J1lurm Here is the link for the C&D Valve Core Wrench, Container, and 3 valve cores- amzn.to/2EVGkps Here is the Link for the newer UEI DL479 Multimeter with temp sensor- amzn.to/2jtsUbJ Here is the Link for the FieldPiece ST4 Dual Temp Meter- amzn.to/2AhR6ph 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 All of the ACSERVICETECH Playlists- kzbin.info/door/OZR-1IqsAer9wzlvFgb4mAplaylists?view_as=public

[@prodjay10]

I'm about to order the tools to pull a vacuum using your list, but I'm confused as to which hoses I need. You have a red and yellow hose in the video, but a red, blue, and yellow hose listed. The yellow hose is not yellow once I click on the link. This is what I'm ordering: 3)Appion Valve Core Removal Tool- amzn.to/2uYr8WL 1)CPS Vacuum Micron Gauge- amzn.to/2v1nM3O 1)Appion Red 3/8" to 1/4" Vacuum Hose- amzn.to/2uYg6Ro 1)Yellow Jacket 1/4" by 1/4" heavy duty hose straight- amzn.to/2umtcod 1)RectorSeal Bubble Gas Leak Detector amzn.to/2ckWACn 1)www.amazon.com/dp/B00SV8BCB4/?cv_ct_id=amzn1.idea.3TU6QWW7V7OQI&cv_ct_pg=storefront&cv_ct_wn=aip-storefront&ref=exp_cov_acservicetech_lv_dp_vv_d

[@prodjay10]

Should I just buy a manifold gauge set and use it's hoses for a vacuum? I only intend on doing this once.

[@MichaelMantion]

You may want to put a comment near the start of the video to remind technicians to use a A2L compatible compressor when using A2L and A3 refrigerants.

[@michaelmerryman7806]

So if my line set broke and dumped everything out, to recharge do I vacuum the new line set and the unit by leaving the valves open? Or do I close then and vacuum just the new lines before adding the 410

[@randycapilitan978]

Aaaaaaaaàaaaaaàaaaaalpapalp

[@bobbigrant9158]

Finally got it up and running. The only delays we had was because we realized we needed some extra parts (I’ll list that below) kzbin.infoUgkxihMYiJNXcHdbH-7ihymsLz61l7jVyb5O . So we have a loft where our current hvac just couldn’t seem to keep cool during the summer. We have been using a window unit since we bought this house over 6 years ago (all the houses in this neighborhood were built in the 80’s and majority of the houses built like ours use a window unit). I hate window units because they are just so noisy and the one we had really only cools one side of the loft. I had contemplated upgrading our current HVAC, but with all the rising prices these days, it would take years before saving up enough to do that. With the advice of my father-in-law (used to run an HVAC business), he recommended we get an inverter instead. We thought we bought everything we needed, but there were just a few other parts we didn’t anticipate needing (which is what caused most of our delay). My friend and father-in-law did all the work to get it installed and running and now we have nice cool air circulating nicely throughout the entire loft. It is very quiet and even the outside unit is much quieter than our main HVAC unit. Saved ourselves thousands getting this.

[@joshuacotton8114]

You skipped the entire part where you hooked it up!

[@Adman0402]

I've been watching your videos for some time, and I just now got the set up for this vacuum. It's absolutely incredible. Thank you for taking time to teach us newer techs the right way of doing things.

[@soukavathkeomisy3858]

I've been in the commercial kitchen repair industry for 15 years and this is top notch. Awesome job man. Great tip for using that third valve core removal tool! I'm stealing this idea and subscribing.

[@jimrika2]

Excellent, clear explanation. I appreciate the time and effort you are putting into every video. New techs need to subscribe and take notes.

[@acservicetechchannel]

Thanks Jimrika2!

[@runwayray]

Excellent explanation and refresher for those of us that has been away from HVAC awhile. What you don’t use, you lose! Thanks

[@acservicetechchannel]

Thanks Raymond!

[@BennyBladez-]

That’s a fact! Left for 10 years, went back to school for industrial maintenance mechanic and did that for 8 years. That was enough. I rather deal with a much safer work environment and much less stress

[@MC-mq8mh]

I've learned so from this channel, I literally have a notebook full of notes just from these videos. Keep up the great work 👍🏽👍🏽👍🏽

[@acservicetechchannel]

Thanks MC!

[@user-zd6fv5vx7c]

My Brother has his own small A/C company and I help him when he needs help but he doesn't have time to teach me so these videos are Awesome !!!

[@acservicetechchannel]

Thanks robjoder!

[@stestar09]

Well have you asked ?? It's a bad doo if somebody doesn't have time for their family .

[@jsmitty4675]

Our company is in ohio Gutridge if you are interested in an apprenticeship

[@rickythomasson847]

@@jsmitty4675 I'm near teays valley WV. If this is still avaible message me . I'd be interested

[@Stewartplumbinginc]

Great Resource for HVAC Community! Thanks for the hard work in putting these videos out there!

[@acservicetechchannel]

Thanks Stewart Plumbing!

[@mike32oo]

Excellent video, I didn't know you could pull a vacuum this fast. Most of my vacuums took 1-2 hours because I never took out the schrader valves or uses hoses free of valve core depressors. Thanks man, this should save some time.

[@acservicetechchannel]

It really does, check out the recovery and pressure testing videos too other processes, thanks

[@DayClanTribe]

Old comment I know but wanted to point out that aside from the valve core removal, the key is in those larger hoses and as short as possible. Huge time saver.

[@lennyc624]

I've been watching many of your videos and they are by far the most informative. Thank you.

[@acservicetechchannel]

Thanks Lenny C!

[@moisessanchez870]

Excellent videos you have, i always watch them and they have helped me. Thank you

[@acservicetechchannel]

Thanks Moises!

[@IconMaintenance]

Thank you for taking the time to make and share this terrific video...it was informative, brief, to the point and easy to understand...

[@acservicetechchannel]

Thanks a lot James!

[@centerb541]

Same vacuum pump we use at tech school. Great video man!

[@acservicetechchannel]

Thanks KuatoLives!

[@vineetsehgal4738]

Why u not vacuum at highest low vacuum level like 15 micron?

[@josemj059]

Thanks bro for all the time you take to explain great work.

[@acservicetechchannel]

Thanks for your comment JAMDYAC!

[@knockitofff]

The gas ballast (if equipped) should be left open until 1200 microns, then closed, thereby bypassing the oil in the pump. Another nice trick to clean your oil and reuse it is to simply run the pump with ballast open, you'll actually see, in about 20 minutes, the oil clear right up if it's milky. The oil industry doesn't like this trick to be known.

[@acservicetechchannel]

We usually only keep the gas ballast open until around 10,000 to 15,000 microns, thanks!

[@dakota7701]

Excellent video. Thank you for making this informative video.

[@acservicetechchannel]

Thanks Maurice!

[@felipeballi7679]

great video, great job on explaining the whole process.

[@acservicetechchannel]

Thanks Felipe!

[@azhvacr2332]

Very nice video, good info. Saves time and vacuum life. 👍🏼

[@acservicetechchannel]

Yes absolutely, Thanks Manuel Torres!

[@davepenprase]

thank you for sharing your knowledge

[@acservicetechchannel]

Thank you very much David!

[@resurgensix]

Great example in real time. Saving that for review later for sure. Thx as always Craig!

[@acservicetechchannel]

Glad it was helpful!

[@NatureIsMyFriend]

Thanks a lot for these videos, they are really helping me learn

[@acservicetechchannel]

Thanks Prince!

[@mojoemurphy]

Instead of spending all the extra cash on another CRT I just use a yellow jacket 45° all brass ball valve to the micron gauge. Also, I have the same 6 cfm pump and I made my own manifold. 3/8 Tee (NPT) to (2) 3/8 NPT to 3/8 flare. I started using 90° fittings so both flare fittings face forward. Good video.

[@acservicetechchannel]

Got ya, sounds good! Sometimes in the past I found that the yellow jacket ball valve wouldn't hold at deep vacuum so that is why I switched to the valve core removal tool rated at 20 microns. Glad to hear it is working for you!

[@HVACinSC]

Enjoyed the video. Keep up the great work!

[@acservicetechchannel]

Thanks HVAC in SC! You have great work as well!

[@jericosha2842]

Good idea on core removers as a valve! Thanks for helping.

[@acservicetechchannel]

No problem!

[@Gameboy_Steve]

Thank for all your videos they have helped a lot

[@acservicetechchannel]

Glad to help Steve!

[@emilfalck5470]

Happy Sunday,tks ,,God bless, from the good Land Milwaukee WI

[@acservicetechchannel]

May the Lord Bless you too Emil, Thanks!

[@timothynovitski9133]

Love this guys videos

[@acservicetechchannel]

Thanks Timothy!

[@WillianPortela]

Thanks for sharing this wonderful video!

[@acservicetechchannel]

Thanks a lot William!

[@mymobilemechanic8896]

Great explanation!!

[@4brothers161]

I bought the Red hose, yellow hose and 1 Appion core remover since I already had 2 and tried this set up today. This works great. I pulled a vacuum down to 363 microns in 10 minutes and I didn't even change the oil on my vacuum pump.

[@christophernewman2824]

Was it also a new line set?

[@henrykelly7837]

Excellent

[@yujen725]

thank you for this good explanation video!! I was wondering, after you remove the core and after you vacuum the system, how do you add refrigerant while the core removal tool connected to the compressor and while the schrader is removed? also, how would you purge the hoses while using the core removal tool?

[@cooltime3040]

Well done - thanks!

[@acrepairnearme]

Thank you for the cool video! Very good explanation.)

[@acservicetechchannel]

Thanks Tapch MC!

[@williamserver4332]

Great video.

[@qomco]

So quick. I gotta start doing it this way

[@tommyteamer9037]

Thanks for showing how to do vacuum test and a leak check

[@WillianPortela]

Perfect work!

[@acservicetechchannel]

Thanks William!

[@darrenskinner5928]

Thanks great video

[@acservicetechchannel]

Thanks Darren!

[@kylepronesti2954]

great vid thanks for sharing. much more confident on my ac install tomorrow lol

[@acservicetechchannel]

You got this!

[@johnperez4381]

This was an informative video. Love how you made It easy to understand.

[@acservicetechchannel]

Thanks a lot John!

[@vegitoblue7908]

@@acservicetechchannel Hi there. Is it normal when pulling vacuum. You turn the vacuum off and the vacuum doesnt hold the pressure??

[@mikefixac]

Absolutely love this video and also the comments. This is kind of a physics question: When drawing a vacuum from both ports simultaneously, is it possible the vacuum can work against itself? Hope the question makes sense. Thank you.

[@rickrossi7426]

Thank you. Very good video.

[@acservicetechchannel]

Thanks Kenny!

[@mikecummings2188]

super video thank you very much

[@acservicetechchannel]

Thanks Mike!

[@brianortiz2200]

Great video thanks for sharing

[@acservicetechchannel]

Thanks Brian!

[@pablorodriguez107]

Good job!

[@jamesrockford5145]

A true professional.

[@acservicetechchannel]

Thanks James!

[@Kommaer]

..only, if he did'nt use a hammer on that outdoor unit :) (funny) :)

[@MrG-hm7xs]

Great video thx...

[@acservicetechchannel]

Glad you enjoyed it

[@scotta9114]

Thank you for this fine video. Can't help but learn from it. I had a misfortune on a Service call. Hard lesson. Vacuum hoses didn't have Check-valves. Started the evacuation process and took a lunch. The Vaccum Pump blew the circuit breaker and the line-set sucked the oil out of my vacuum pump and contaminated the whole system. Was a bitch or flush out and recharge (R-22). Didn't make any money that day. Never gonna do that again! Anyway, thanks for the video.

[@phillipjoy8191]

Great video 😁

[@acservicetechchannel]

Thanks Phillip!

[@fernandojr8436]

Your the man

[@HVACRDUDE]

Love the different service wrench sizes..they have 3

[@acservicetechchannel]

Ha ha, that was the correct size but didn't quite fit well, the smaller two sizes were certainly too small thanks!

[@padilla7019]

Another great video

[@acservicetechchannel]

Thanks a lot Luis!

[@edwinmillay9976]

Very good instruction. Could this process be done with only 1 valve core removal tool and 1 hose ?

[@arturobolanos6061]

Your video is the bomb.

[@AL_ABAAS]

Amazing video, I wish you had your gauges in view when you opened the valve

[@hvacguy542]

Great video thanks a lot helps when you forget lol also helps for the apprentices

[@acservicetechchannel]

Glad to help!

[@offthetrail636]

4th time I’ve watched this. Thanks man I’m an apartment maint tech so I don’t get to do this very often

[@acservicetechchannel]

Awesome, I'm glad the videos are being used!

[@rip9452]

man you are a BEAST! I watch all your videos and You are making me a better technician. Ac is my passion but i’m really into ice machines…. Do you have any videos on Commercial isomatics or Mitsubishi’s? Contact dealing with harvesting motors or timing relays. I also have really enjoyed learning walk-in freezers in about the defrost termination any kind of information on that we’d love to see it

[@dr00andrew]

as far as opening the service valves, if you buy the napa carlyle 3/8 drive 3/16 and 5/16 allen key bits, they will never fail you. the allen key is about 3 inches long and if you use a long handled ratchet, you will always have the proper depth into the service valve and leverage with the ratchet. it helps tremendously opening service valves

[@jhonnychingass6252]

Best videos out there,,,,I have a question what side you open 1st when you install a condenser..low side or high side?and do you need to break vacuum? Or can I open valves with unit in vacuum?

[@hediervarelamedina987]

The question I have to ask is: is this kind of vacuum produced when the machine is fully charged with freon? when making a vacuum on a repair due to a change of compressor it can be done or in that case if it has to be done with the set of pressure gauges on. I appreciate the attention provided .

[@usahoangsatruongsa]

Why did you release the refrigerant by opening the low side first ?? My helper did it once and it made a loud hissing sound like something is leaking. Thank you for sharing your knowledge and experiences.

[@erics9213]

Why not 3/8" lines on both the liquid and suction lines. How long for the blowout? Thanks for these videos.

[@mark.r8900]

Hi, after replacing a suction line and liquid line service valve do you perform the vacuum with both valves open? If so, wouldn't the vacuum pump pull compressor oil out of the system? Thanks

[@freddyrangel4627]

One question when doing the vacuum pump pressure test do you also have to take out the piston in the coil or do you leave it in there??

[@alfredoandroid357]

Thanks for the video , Where does the other end of red hose get connected to lol

[@toemblem]

Great video, thanks for posting. As far as breaking vacuum goes, I understood it to be a bad thing to open the service valves. I was told this is because the vacuum could pull too much oil out of the compressor. Am I operating on bad information? Also, I've found that the cooler you keep the service valves (while brazing), the easier they are to open.

[@acservicetechchannel]

It certainly doesn't hurt to break the vacuum with refrigerant from the bottle. The manufacturer will usually say it is ok to open the service valves to break the vacuum. They tell you which one they would like to open first to avoid any oil lost into the tubes and out of the compressor for the initial startup, thanks!

[@joeyysossa4144]

You should also mention to recover the refrigerent before dtarting the vacume presses...

[@Alex-jo2oi]

Lol a couple of people might get some refrigerant burns if they think to skip that part…

[@andrewbutler1423]

Would it be best after reinstalling the valve core to pull the stem back and valve off before removing the stem of the tool, just in case the valve core didn’t seat correctly in which case refrigerant would be release from the system. If you valve it off first you have full control of the refrigerant? Hope that made sense.

[@Frank289100]

From your experience. If you have a leaking flare nut on the line sets on the mini split unit that loses gas every season. We're during the upcoming season you fill the system up topping it off, and have done this three years. I've noticed that the system now doesn't cool as well as it did when I first installed it. In your opinion and experience. Could the unit have taken in air affecting the performance of the unit. Where it would be a wise thing to remove all the gas and pull a new vacuum and install new freon to get it to cool the way it did when it was first installed.

[@rayeopp8957]

When do you use the clamp meter to measure the "A"

[@FlyEaglesFly19111]

I always use fresh oil on each vacuum. And some systems need the oil changed after 5 min of run time. Apion..they are the best core tools..love them. How about a triple purge? Also I use the t and 3/8 hoses on my REFCO..9cfm.

[@acservicetechchannel]

I don't do a triple evac if the standing vacuum holds at the 200 or 300 micron level. This proves the moisture is gone. Yeah those appion's are awesome, thanks David!

[@justinblack2984]

I have a question about the vacuum procedure, when pulling a vacuum and I have a fixed orifice, should I remove the orifice to perform an oil blowout and leave it out during the vacuum pump or just leave it in? Its a R22 and I'm retrofitting for R422B

[@Rhythmhousedrums]

Thanks for all your videos. Very helpful! Could I pull a vacuum from just one service valve using one hose? Is it just quicker to use two hoses or is there any other reason. I know smaller mini splits only have one service valve anyways.

[@acservicetechchannel]

Minisplits have the metering device for the evap at the outdoor unit so there is no restriction halfway down the line like on standard split systems. That is why we pull from both sides and it is faster and you microns readings will be more accurate. No need to on minisplits, thanks

[@workinprogress008]

Is there a list on which line manufacturers recommend to open first?

[@syntaxlies82]

I vacuumed my mini split down to 150. It rises 1 micron about every 10 seconds. Should I just run the vacuum longer or wait and see what it stops at if it stops?

[@lopaka79]

Only thing I do different is adding a wireless transducer on the non-micron gauge core removal reference and only pressurize to 20ish psi. Allows for easier core install and lower de minimis.

[@HonestDiner-cz4op]

You opened service valves with wrench to break the vacuum. But I never saw you close them back up. Could you kindly explain!

[@peterd6592]

May I ask what is the purpose of opening the gas valve and close it after machine started? Can the gas valve be left open? What is its purpose anyway? Tks

[@jonr4721]

Ok first off great video. But I have a question, it's a 60-65 ft lineset and the outdoor comes orecharged for 15 ft of lineset so 45-50 ft * .6 Oz per foot needed how did you add the 27-30ish ounces of 410?

[@davidb2438]

Are there any problems cross threading a Schrader valve using the valve core removal or does the tool help align the valve properly?

[@Josh-px6xb]

Question. I had two 3/8 hoses hooked up with 3 valve core tools with the micron gauge and I was able to pull to 390 microns but when it was finished & I went to isolate the vacuum and close the shut offs, I was instantly losing like 300 microns then it would hold. it passed nitrogen test also any ideas of what was happening?

[@tonyloww281]

What if you need to add refrigerant? Can you just use either of the top valves on the Apion Schrader removal tool?

[@GurdeepSingh-bu6ee]

Hello there, I the vacuum on the new system as per this video. Than ready to open service valve on suction side. Open the valve cap to do so. I lost the vacuum in the line set. What I'm doing wrong..? Thanks

[@termite2691]

Finally something that explains how you put the valve cores back in without screwing up all your good work.

[@16hershey135]

Thank you . Like being on the job with you .

[@acservicetechchannel]

Thanks Lent Builders Inc!

[@stevengao8345]

thanks for the wonderful video, i have a question at the end that is why don't you put the shredder valve in before you break the refrigerant ? thanks

[@TheBalterok]

Had same question. Did you found an answer to that?

[@garrythompson4132]

Am I to understand that the two vertical core valves are closed during these procedures eliminating the compressor? In other words, just the tubing from the valves thru to the evaporating coil are tested?

[@rp4323]

If there is dye in a system does it evaporate. In other words will it affect getting it to hold a low micron level?

[@troymason4799]

Can you put the Schrader valves back in before breaking the vacuum?

[@klanda1095]

Hi , Do you have a video on vacuuming a 4 zone 36000 BTU mini split , 4 9000 BTU INDOOR UNITS .. Do you have to vacuum line sets individually or is there a way to do it in one shot ? Thanks

[@strayhandycat2753]

Fellas! I need an advice. I vacuumed the 16 ft long line. Left the manifold connected. (While having the low pressure blue valve shut). After 1 hour, I could see the needle was going slightly down. (To -29?). After 10 hours, the system pressure goes back to 0. The question is, if this outcome normal? Online I read people say 15 minutes is enough to test lines with vacuum. Does it mean I loose vacuum due to the manifold connections? Or is there a great chance of a leak? Thank you!

[@victordock7872]

great

[@gtimikey1]

Is it better or recommended to put micron gauge on discharge side of the core remover since its the furthest from the vacuum pump.

[@Billpimentel82]

Question, the AC condensing unit is isolated when running a vacuum correct? unless there is no refrigerant at all in condensing unit?

[@ranimouf]

Does the pump also gets rid of any left over freon in the copper lines if you'' re replacing an R22 condenser To a 410A condenser?

[@aperlia6603]

We pull down through our gauges with the yellow a massive vac hose. Honestly pumps down relatively quickly, generally under 20 minutes. This looks like way more work lol.