Steps to Vacuum and Charge Refrigerant on a Mini Split Unit!

In this HVAC Training Video, I show which Tools to Use and the Setup Step by Step to Evacuate and Add Refrigerant into a Minisplit Unit. I Show Vacuuming the System, Performing a Standing Vacuum Test, and Breaking the Vacuum by Weighing Refrigerant into the System from the Bottle. 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
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Our Related Videos/Articles
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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 #vaccume #vacuum #charge #service #evacuation #evacuate #refrigerant
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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]

Mini Split Book on Our Website- www.acservicetech.com/mini-split-book Mini Split Book on Amazon- amzn.to/3ytHJSs Mini Split Book on TruTech Tools- www.trutechtools.com/BooksGuides Mini Split E-Book on Google- play.google.com/store/books/details?id=HN-iEAAAQBAJ Mini Split E-Book on Apple- books.apple.com/us/book/id6445178399

[@garyyancoskie905]

Where did you purchase the 5/16" female quick connect x 1/4" female SAE adapter for the pressure gauge. Can only find female x male adapters . Thanks

[@tommyt4062]

hiya, could you tell me the pipe run length (i'm guessing short?) and obviously its difficult to see from a video but is that 1/2 and 1/4 pipe? Thanks

[@goldbangle6184]

thank you so much because you now i can service ac 😍🌹🌹🌹🌹🌹🌹

[@masoud_gh]

شششششششش

[@RajeshKumar-zf5je]

PPP pppppppppppppp pp p0pppppppppppppppp0ppppppp of pp ppppp

[@harthenry]

I would be more than happy to pay a technician more to charge my A/C if I knew he/she was as thorough as you. I've had a few guys come to our house that just bang on the unit and connect hoses and do not go to this detail (I guess that is why they've been here a few times). If nothing else, your video should be a good lesson to existing HVAC Techs to make videos so that I would feel comfortable in hiring them to come to my home. Not just good info/education for me, but great advertising for the HVAC Techs too.

[@kiyoponnn]

Agreed, I am sick and tired of getting scammed by incompetent morons.

[@TheMicsaund]

Agreed - I watch all these videos and wish I could find someone in my area who does such quality work. The large company in my area, who installed my new whole-house system, was skimping on the "annual required maintenance" for the first three years! In the fourth year, the guy said, "hey they haven't even opened this cleaning port" and he had to cut into the insulation to get to a drain pain that was filled with crap and rust already.

[@paulswift5196]

That’s why I never hire anyone to do work on my house. I’m better off watching KZbin and learning something new.

[@paulswift5196]

My mom hired a guy to clean out her furnace. I just happened to stop over that day and I checked on the camera what he was doing. Watching baseball for 40 minutes banging on the side once and awhile. Lol.. it was great when he came upstairs and asked for 200$ told him to hit the road your on camera watching baseball bud.

[@blackishpariah]

I installed a Fujitsu last week, pulled down to and held 101 microns using your methods. You're my go to instructor.

[@acservicetechchannel]

Awesome Kenneth, great job!! Thanks for letting me know!

[@lordjaashin]

what is the size of charging port on your fujitsu split? is it 5/16 inch?

[@HVACRTECH-83]

@@lordjaashin yes

[@youarehere1716]

I'm a DIYer homeowner, not a tech. But for some reason I find heat pump technology fascinating even though at my age as an SW engineer, becoming a professional HVAC technician is not in the cards. After my 2nd multi-zone mini-split install where your videos provided most of what I needed to know, I finally bought your eBook. Your videos and free online docs helped me so much that I decided to get your eBook (to learn about checking and recharging a unit), and to understand things better. Also, you've earned the respect and appreciation to get some remuneration for your service, IMO. After getting about 10 pages in where you introduce the basics of refrigeration and the physics, I'm beyond impressed. The diagrams are excellent. The explanations, are clear, thorough, and convey the points succinctly. For anyone reading this, I'm in no way affiliated with these people, I'm just saying if you actually want to understand the core concepts and/or specifics, the book is a worthwhile investment. The eBook is pretty reasonably priced considering how good an educator the author is.

[@floridasaltlife]

Same here, in fact it drove me to get my 608 and it has become a hobby...

[@krehbein]

Glad to hear other diyr’s can take this up as a fairly technical “hobby”. Not a sw engineer but web developer. Could you work on a traditional outdoor condenser unit, or the indoor evarporator?

[@thomasjust2663]

Its good for doing stuff on your home I guess, but not to work as a tech, then you have to deal with using ladders, aggressive dogs, lady's who are never satisficed with the work, customers that hit on you (both women and men), it can create all sorts of drama, is it worth it to spends hundreds of dollars for work you do perhaps twice a year? I'm not sure it is a cost saver, also you have to separate space to keep these tools in working order

[@electricboogie709]

I can't say enough about how I appreciate these. I have been doing HVAC/R for eight years now and I always go back and read, watch, learn, over and over again. Never being satisfied in myself, but making sure I do things always to the best I can. Plus my memory really sucks. Thank you!

[@acservicetechchannel]

Hey you will be great with all the investing you are doing in yourself!

[@daveyboy8907]

Same here but at least we care enough to try our best..So many half ass techs out there just trying to bang them out and get done fast..

[@marklennon1580]

I have seen many videos on how to do this procedure but none of them even come close to the clarity and precision that A/c service tech brings to the table. Thank you sir for helping the general save money and the atmosphere at the same time.

[@acservicetechchannel]

I am glad that you learned and enjoyed it, thanks!

[@andrewsimon5437]

I just used this exact method with the exact two Appion valve core removal tools in order to install a 9000btu mini split. Even with the cheap harbor freight vacuum pump it pulled a great vacuum and held steady; I observed no leaks. As a homeowner I am excited to be able to do some of my own HVAC work. Thanks for these training videos. They are fascinating!

[@shane2163]

Until the epa shows up to your house lol

[@andrewsimon5437]

@@shane2163 so far so good

[@LichaelMewis]

Excellent, I'm doing the same and plan to install these for my neighbors for a lot cheaper than an HVAC "pro"!

[@robertlamey7612]

Wish I was your neighbor I’d turn you in

[@andrewsimon5437]

@@robertlamey7612 haha to whom, and for what?

[@rickrockin155]

I ve bought 3 mini ductless systems and this really helps me with the installation. I have to buy a few more tools and I'll be ready for the job. Thanks for the vodios they re so helpful, I'm always learning from u guys especially what my instructor in hvac school left out. I didnt know anything about the dry and wet bulbs, he never explained this, so I was always in the dark on how much refrigerant should be in a system.

[@jawbrace]

I love this guy. So smart and doesn't over complicate what he's doing. Kudos to you!

[@acservicetechchannel]

Thank you for your support!

[@hotwort]

Excellent! You are a great service to the HVAC Community Craig. Oh yeah your book is terrific, worth every penny.

[@acservicetechchannel]

Thank you very much Lester!

[@sarathlallal4523]

Wapp nu plzz sir

[@conradlowther]

Craig, great video. I purchased your book as well and it’s excellent. I do the same setup with one difference. I hook my service hose with ball valve to the side port on my second valve core tool. I leave the refrigerant bottle valve closed but my service hose valve open during final vacuum so that I am vacuuming the air out of my service hose. Then I close the valve on my service hose right before I turn off the vacuum pump and do a decay test. Then I isolate my vacuum gauge, open the valve on my refrigerant bottle, and use the valve on my service hose to throttle in the required charge. The advantage to me is I have pulled out some of the entrained air and moisture from my service hose by subjecting it to vacuum, and I don’t have to wonder how much air I purged out of the service hose using refrigerant to push it out, or lose any more refrigerant than necessary. There is also air between the valve on the service hose and the valve on the first core removal tool that is impossible to purge normally. I’m interested to hear what you think of this setup and if it makes sense or if there is a downside to the way I do it that I’m not thinking of. Thanks

[@datadogie]

The best tutorial I have seen. I was always concerned about those easy fit mini splits. If the lines are not pre gassed, but the compressor is then this explains a lot.

[@toddbehrends1373]

Thank you for using your training and knowledge to help us "sometimers" be able to diagnose problems with our home systems so we have a better idea of the trouble when we call a tech to come fix it. Or it may be something that we could take care ourselves. Either way a better understanding of the systems and how they work is helpful.

[@acservicetechchannel]

Thanks a lot Todd and thanks for your support on Patreon!

[@Theendlesssolitude]

Clear, fast, detailed and directly to the point! Thanks for your detailed video!

[@channelcatchaser9426]

I used the Spin Flair set on my last installation. It works perfectly! I would highly recommend it

[@acservicetechchannel]

Nice, thanks for letting me know!

[@phlogistanjones2722]

Thank you so much for the clear and concise information. I appreciate that you took the time to both show and tell what you were doing and how it was done.

[@abaidaramex2818]

I have installed two zone system just after wactching your videos this was my first job. Thanks for sharing your knowladge

[@acservicetechchannel]

Thats great! Thank you for your support!

[@richardcdldriver]

Which mini split did you install?

[@richardcdldriver]

Which mini split did you install?

[@mariusfauru]

Thank you for your awesome advices! HIGHLY APPRECIATED!!! 😎👍🍺 installed my 2 split units without problems after watching your videos! Super clear and simple!

[@acservicetechchannel]

Thanks a lot!

[@scasinger123]

I love your videos. I installed a mini split but messed up one of the flare connections when I shortened the line set, and lost all of my refrigerant. After having several companies come out and give me ridiculously high bids, while berating me for trying to do "this kind of work" as a homeowner, I was fed up. Watched your whole series and learned so much. I realized that of the 4 ac techs that came out, not one knew how to properly evacuate, test and recharge a mini split correctly. And not one wanted to do super heat, saying, "There's no need to do that".

[@wolfdale_3m]

Well, to be fair, handling refrigerant when you're unlicensed is discouraged and even illegal in many places. What you just caused to the environment after letting all that refer into the air isn't something trivial. My take is that you can install the indoor and outdoor unit to your heart's content and then call an HVAC technician to assist you in the piping, leak testing, and charging of your system.

[@scasinger123]

@@wolfdale_3m Ah, BS, BS and more BS. 2 of the techs that came out planned on letting the rest of the refrigerant out and weighing in the proper amount. I asked them if they used a recovery tanks and they both said something to the effect of "Nah. It's not enough to matter". As for "illegal in most places", two of the techs that came out weren't licensed HVAC contractors at all. They are working for an HVAC company under that license under "supervision". I don't know about the other two because I didn't get their full name. You should probably bone up on EPA regulations before trying spew nonsense. The whole HVAC industry is a racket. I just found a way around it.

[@wenbin6312]

Thanks for the great video for sharing on the steps to be done. In Singapore, most installation for mini-split doesn't use micron gauge like how you did in the video. 😞

[@stuzman52]

Great step-by-step procedures Craig and keep up the good work!

[@acservicetechchannel]

Thanks a lot Stuzman!

[@MJ-iy4fb]

Great video, each time I watch this I get a little more info. This process was a little tricky getting right, thanks for clearing up the matter for me.

[@martinheatingcoolingmartin4693]

This makes me happy and I look forward to my AC and heat pump unit work. It’s not so stressful when it’s simplified. I really want that book too. I plan on buying any other resources too. I appreciate the videos and knowledge you share, thank you!

[@acservicetechchannel]

Thank you so much!!!

[@chriscermak3188]

Another great video Craig. Thanks for explaining the 5/16 fitting.

[@acservicetechchannel]

Thanks Chris!

[@chodge8366]

love the two valve removal tools in tandem. great idea!

[@acservicetechchannel]

Glad you like them!

[@bobrebera494]

learning never gets old-good job

[@acservicetechchannel]

Absolutely! We are all learning all the time, thanks!

[@martinguigou5313]

Thank you for the tool list, I will order the books soon!

[@acservicetechchannel]

Great and please feel free to ask questions! The full outline of the book is available at www.acservicetech.com/ac-book thanks!

[@jacarandamama7318]

THANKYOUTHANKYOUTHANKYOU! Going to try this on my newly installed minisplit. Will let you know.

[@TheSkyclipper]

Meticulous Instructions!! You have just displayed why it's important to have someone vacuum the lines - and to do it properly! Thank you! Awesome video!

[@themayorofairconditioning2868]

These videos are excellent. You're really a master of this stuff.

[@micmic9410]

You are amazing in detail. Buying my own tools to maintain my ductless installed. Had a 20 year hvac vet install my line sets and charge, 3 out of 5 leaked. Now he won’t come back after being paid- wants more money and had to call another company. They want about $1500 to do this. But I want to learn. These break downs affect the working class way more than people that have wealth. I saved 13k to get this done and this is what I got.

[@Zafarella]

Just wanted thank you for the material. You can add a table of contents for ease of navigation imho. Installed yesterday 2 modules using techniques you described.

[@AaronHadleigh]

Great video mate,Subscribed. I worked for a union trained tech and can see you know your stuff.

[@robertdeming1802]

Excellent video . Now I understand the basics of charging a mini split. Thanks!

[@acservicetechchannel]

Glad it was helpful!

[@waltbe]

There is good info in this video - thanks. Micron, as used here, seems to be a term of trade. As used here, as a unit of vacuum instead of distance, there are 1000 microns to a torr (1 torr= 1 mm Hg). Atmosphere is 760 torr or mm Hg.

[@the1mainconnect]

Right On Great Video. The wanted 700+ to do the final process of my Pioneer Mini Split process. I just built a mobile office from the frame up, I wasn't about to pay anyone for something so simple. I ordered the valve core removers and the vacuum gauge because hey you need quality instruments. I initially ordered a vacuum gauge and pump set off amazon. Big mistake. I couldn't get the vacuum to go under 1000 microns, kept chasing my tail, thought I had moisture in the new system, pump sounded awful too. Eventually ran and got a 2 stage 3CFM vacuum pump from harbor freight and used a line out of the kit to connect, still chased my tail for hours. Almost regretted taking it on myself. Then sat and thought there has to be an issue with the line because vacuum be going down and then up. Changed the vacuum line and bam it was headed in the right direction. Got it down to 160, went back in the morning and it held at 240. I know vacuum is a huge part of it so, I was happy. I didn't nitrogen pressure test. I know I should have but had to try to skimp due to funds. Also key note, in a 2 ton Pioneer mini split, both the liquid and vapor lines have access ports and they are switched from this video. Liquid line is on the bottom. In any case the process worked well and it is blowing cold and hot. Thanks for the detailed video and links!

[@stebarg]

Great stuff!!! Almost perfect! The best description I've seen so far.

[@steyer-crmg]

Awesome video thanks! I always wondered what it meant to gas an aircon.

[@user-kt2hb8xr3p]

شكرا اخي انته حقا مبدع في عملك

[@acservicetechchannel]

اقدر تعليقاتك I appreciate your comments!

[@robmedearis8700]

If you are recharging the system after evacuation and vacuum do you recharge with the valves closed or open?

[@johnlynes4453]

HI Craig, your videos are the best I have seen. I love this set up because this is the only thing I do when it comes to HVAC, i.e., setting up new mini splits, and this set up eliminates the need for using a manifold gauge set which introduce more potential for leaks and contamination from oily gooey heavily used guage sets. Video request, please do one on the entire Nitrogen pressure test. Support Craigs VIDEOS, I bought all the tools with your links! One tool that I bought not on your list is the metric Master Cool mini split torque wrenches. (The line sets that come with the units are metric or SEA on the OD of the nut, but if you buy a set at a local supply house in the USA the OD on the nut will be SAE but the threads will be the same. Therefore, you would have to buy the Master Cool SAE set). One question, In a brand new system, If I am not adding any new refrigerent in, would I reinsert the valve core after I release the refrigerant from the compressor for the first time after isolating the micron gauge? Thanks again and everyone buy the tools from his links!

[@acservicetechchannel]

Thank you very much and you would add the valve core after there is positive refrigerant pressure in the system thanks!

[@PLVtv]

Thank you very much for your time and effort

[@acservicetechchannel]

Glad to help!

[@jimbola77]

love the book partner! very informative.

[@acservicetechchannel]

Thanks a lot!

[@markcaldwell1245]

Excellent idea with the bubbles tester cap.

[@acservicetechchannel]

Thank you!

[@sondiscus6791]

hello, thanks for you video. May I know how many PSI do you do for the mini split pressure test? and what is the acceptable drop from PSI? Thanks

[@RangerCaptain11A]

soon after installing my mini split (thank you for that), I had to move the indoor unit to a different wall, so I mounted the outdoor unit on wall stands. in the process of disassembly I unintentionally let out about 3 to 5 seconds of gas. after I reinstalled everything (thank you again), I ran the unit and the pressure was 55psi, so using the steps I added r410a with upside down bottle, til the pressure was about 110psi (i live in a cool area, about 84 degrees then). before and after, the unit was cooling properly. so is there an approximate running pressure? was my method ok or is removing the r410a, then adding by weight the only way to get the proper amount?

[@phishertube]

best explained charging video yet. Thanks

[@javierdomenech4370]

Great I have one question I need to replace the condenser I have a doct in the house I'm not too satisfied with the inside unit I wonder could I install a mini split condenser to my HVAC so I could cool the entire house thanks

[@harveybrimer1054]

Verry informative, thanks for posting!!!

[@Est-lj4tq]

Clear and concise!

[@johnathindonelson4064]

Another Great Video Ordering The Book Tonight

[@BritishBulldog4]

Hey, thanks for the informative video. Can I ask what you did with the refrigerant left in the hose from the bottle?

[@bobbyhackett7359]

Ayeeee Mr. Miyagi how have you been? It’s awesome that your still doing these videos

[@acservicetechchannel]

Hey Bobby, nice to hear from you! You can email me back at [e-mail] so it doesn't get lost in the comment section. What are you up to nowadays? you doing ok?

[@717273mopar]

Great Video, I am about to install my mini split system and even though I have many HVAC tools I don't have a nitrogen bottle to test for leaks, I would need a bottle and gauges which I would only use once. Can I just vacuum to check for leaks?

[@captainmikek6172]

Thanks Craig, you're and excellent instructor!

[@acservicetechchannel]

I appreciate that!

[@FamilyChannelfun32]

awesome job 👏 thanks alot

[@paulcrescenti5581]

I have not had to deal with an initial charge on any AC units. In a perfect world, my future AC guy would be as careful and precise with evacuation, charging, and startup as you are.

[@jamesluisitobinoya4856]

Thank you Sir, you have a very straight forward explanation.

[@TropicalSnakes]

wow, good job !

[@ghulamemustafa8911]

Thanks a ton brother.

[@acservicetechchannel]

Glad to help Just Teen!

[@purejdmpassion]

Very informative video. I do have a lroblem when doing a vacuum procedure. The vacuum pump vacuums to 200 microns but after 10 min it rises to 1000 microns. The flares are perfect and the system is new. Your help is deeply appreciated

[@jenklingler8169]

did you receive an answer? same boat here...two unit LGsystem with 70' of Lineset between the two. Two appion VCR tools, 1/2" appion vacuum hose, fresh JB oil in pump. Pulls tight down to 250 then after isolating the system it rises to 800 then down to 790 and holds. Nylog on the face of every flare in both the system and vacuum rig. Don't have access to nitrogen. Does it have to be 500 microns?

[@MarcelHVAC]

@@jenklingler8169 You will be fine as long as it stays under 2000 micron in 30 minutes

[@melvinl.yarkabo4113]

Thank you for education

[@isldsnow]

I'm sure my neighbors got tired of listening to this as I was looping this video while i was doing the job. Thanks

[@OldFloatingSeaman]

Same here. Been following all of their Videos and although i have purchased the F Gas manual, theirs is a must.

[@divakaranvaradarajalu7782]

Hi great video. It was usefull. I see u charge the system without openning the valves and the system in switched off state. How the refrigerant will go in when the compressor is not running and valve are not openened. Thanks

[@seymourscagnetti1413]

Nice. Real pro techniques. Well done.

[@Eddy63]

You should write a book Craig ... Lol ... Great vid as usual ... Much appreciated ...

[@acservicetechchannel]

Ha ha, great idea!!!!

[@egemensuzgun4208]

i’m glad to see your using CPS gear, i’m about to buy CPS gauges and a 2 CFM vac pump

[@mgladden2]

Great vids! No one has a video on removing part of the charge on a minisplit that has shorter lines than the built in charge was designed for. Can you please do one? I feel like it's just release the full charge into the lines, start the system, and slowly recover via the suction side of your manifold into a recovery tank while monitoring the scale until you reach the weight that matches the pre-charged weight minus the final weight your line length requires. Is that correct?

[@robcombs996]

Hello and great video! Thanks for making it! Quick question... I noticed that you used a single stage vacuum pump. Do you have any opinions on that vs a 2 stage pump? Is it important or worth it to pay extra for the 2 stage version? You seem so thorough so I figure you might have reasoned this decision before. Thanks again!

[@Dan-pm5vn]

Hi Craig, Thanks for all your great help with all these videos ! I have your book as well. As a DIYer of a 30000 btu Mitsubishi unit , it calls for the final vacuum to 500 mic your book states to follow the manufacturers guidelines . Would like your input on this matter before I pull it down to 300 microns

[@speckulator7516]

I know this is old and I’m not Craig but the lower the vacuum the better. What they mean is anything below 500 microns.

[@mazarat4768]

Great. I wish these materials were in Turkey. But even if he's here, it's too expensive. Your stuff's beautiful.

[@acservicetechchannel]

Glad you like them!

[@WallaceRoseVincent]

Yeah! AccuTrak!

[@catisleguy4291]

I love your video's and they've been so helpful understanding everything. One problem I'm having is the valve removal tools that come with adapters for 5/16 or 1/4" seem to be too long to seat and I can't seem to get a vacuum? Can you recommend another option for a fitting? Thanks so much again!!

[@felixfernandez442]

EXELENT

[@armarra]

that was well described, however the part where you blew out the air in the yellow line before connecting it to the lower junction wasn't at all clear that you had blown out all the air before screwing the yellow hose on. I'd have expected you'd wait until a bit of vapour was clearly visible then shut off the valve before connecting.. I wondered if this can be done with the twin gauge manifold commonly found on automotive air conditioning recharge setups.

[@leodonahue9688]

Thank you, you are a consummate Professional.

[@abdulsslamkhierallah5170]

Thanks

[@mohaalgha3397]

Waleed7rrag RRAG I do thank you very much for your excellent instructions and great detailed explanations. You are always during your videos answering all the what, why, how and what not to do with great details and explanations. Having said that, I know you are very busy but if you would please answer a few questions about the mini split AC: 1. As you know the mini split AC of all brands and kind has no high side shredder valve and I do not know why, so is it good idea to install one out side the system near the low side shredder valve? 2. I have a mini split AC under full maintenance including a leak repair on the condenser, as you know the metering device is just at the end of the condenser going to the evaporator, in this case is it OK to feed nitrogen gas from the low side all the way to the condenser to test the condenser leak repair? will nitrogen pass through metering device? and if so will it affect the metering device and or the high side of the compressor? 3. After doing system and line set vacuuming, is their a need to add 2 ounces or may be less of a compressor oil? I can not find any sold information on this issue? Last but not least, thank you very much for teaching and helping so many people not just in the U.S.A. but around the globe as well!!!

[@tonycrawford8147]

i just bought this vacuum pump. and no instructions come with it. it shows the oil fill cap as the exhaust also. do i keep cap on or loosen oil fill cap or not?????

[@umargul5644]

Great 👍 thanks

[@sandysavard8030]

Hello , thanks for the great videos. Is there a way to isolate each line set in a quad line set system. Also when you pull a vacuum and hold it overnight should the vacuum go down at all due to temperatures outside? The reason I am doing this is because of a leak. I have the R410a taken out of system in a storage tank and do not know if i should even use this old r410a. If i had a leak in the system before would that have infected the stored /reclaimed R410A. Any help here would be greatly appreciated.

[@SnickasBah]

I followed this step by step and did 2 Daikin units today. Thanks a million Craig. Weird how both supply houses near me didn’t have Nylog.

[@wangfred]

that is the real training, subscribed!

[@acservicetechchannel]

Thanks Fred! Glad you enjoy the channel! We have resources over at www.acservicetech.com too.

[@keithwins]

It's the little things... I really like how you show purging every little part of the system and the tools, really great. I am fascinated by how short a test it is though. I charge with Nitrogen to 400 lbs, and wait a while if I can. You only took 6 minutes (it took 4m to get to 340) in vacuum! I wouldn't have thought that was enough to be confident. Of course, time is money. Anyway, thanks so much for such a detailed video.

[@acservicetechchannel]

Vacuum time doesn't matter, only the vacuum level and I did a 10 minute standing vacuum test to verify true vacuum level, thanks!

[@honestman276]

Thanks from Bangladesh.

[@marcbraithwaite427]

Question: I have a multi-zone mini split but only have one of the indoor units attached. The outdoor low pressure pipe was damaged and leaked while the valves were open. Does that mean I need to recharge the entire system? And if so, would I need to vacuum out the system with the valves open and charge it the same way? Any assistance would be appreciated.

[@roddeperalta4605]

l just installed my gree multi unit mini split system got so excited .I bought all the the tools I need except the vacuum pump. I cut all the line set shorter then re flared them all. I turned the system on.it works for three days hot and cold works perfect until the next day the system won’t blow any hot air. What should I now?

[@kevincowan7131]

how long after the vacunm equalizes should the stay put or rise ???

[@luiselizalde6757]

Excellent thanks

[@acservicetechchannel]

Glad to help!

[@aihf3063]

Craig where did you find that adaptor to your vacuum pump. I have Apion 3/8 hose.

[@DeepakGupta-cz4rh]

Very helpful video for coreremove valve

[@acservicetechchannel]

Thanks a lot Deepak!

[@SatanIceCream]

Good video... I appreciate that mah brah... peace from sunny SoCal 🖐🏾

[@acservicetechchannel]

Thank you for your support!

[@crowderglen]

I am from the UK and a newbee to the air conditioning world. From the few people I've spoken to in the trade and from watching UK mini split installations on KZbin, the trend here is that less than 4000 microns is an acceptable vacuum level. All of them are using a gauge set and 1/4" hoses. I've followed Craig's steps and my last vacuum achieved 280 microns on a mini split with a 4 metre line set length. This was measured with a Fieldpiece MG44 vacuum gauge and Navac 1/2" hose and Navac core removal tools. After the vacuum I found oil in the hose and wondered if this is normal?

[@mihaipopa9414]

Splendid presentation, thanks!

[@acservicetechchannel]

Glad you enjoyed it!

[@bobzhou9166]

Great video, what's the small valve tool name? where can I buy them, thank you.

[@Kntryhart]

Good stuff! Thanks!

[@acservicetechchannel]

Glad you liked it!

[@alfredoandroid357]

Thank you Thank you Thank you I follow your video and how to pressure test and vacuum, my system work out great . I didn't see a donate page or email address for me to send you a donation or tip via PayPal so I just brought your book on Amazon the $59.00 ac book . Thanks again appreciate the help .

[@user-jw4xf9us7t]

You Are My Hero

[@EvanEdstrom]

Very educational, thank you. Two questions: 1- You shut off the valve so fast when purging air out of the refrigerant bottle hose, it's hard to tell what you are doing. Does it stop hissing when the refrigerant hits the valve or is there something else you are looking/listening for? 2- What do you do with the extra refrigerant in the hose once you are finished with the job?

[@DevLSerg]

What you can basically do is let a little bit of refrigerant out(liquid form ) it’s whitish, as soon as you see a little you shut the valve off. You do this so no moisture goes inside the line set. And If its just a little just air it out.

[@samersarah957]

Thank you Craig for informative video. When adding refrigerant R22 is possible to add as liquid while the unit is not working and if it’s working should go with vapor? Thanks.🌺