Steps to Vacuum and Charge Refrigerant on a Mini Split Unit!
ฝัง
- เผยแพร่เมื่อ 1 พ.ย. 2019
- 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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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. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
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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
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
thank you so much because you now i can service ac 😍🌹🌹🌹🌹🌹🌹
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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!
Hey you will be great with all the investing you are doing in yourself!
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..
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.
Same here, in fact it drove me to get my 608 and it has become a hobby...
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?
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
I installed a Fujitsu last week, pulled down to and held 101 microns using your methods. You're my go to instructor.
Awesome Kenneth, great job!! Thanks for letting me know!
what is the size of charging port on your fujitsu split? is it 5/16 inch?
@@lordjaashin yes
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.
Agreed, I am sick and tired of getting scammed by incompetent morons.
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.
That’s why I never hire anyone to do work on my house. I’m better off watching TH-cam and learning something new.
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.
Charging 200 dollars per pound of Freon by 6 lbs 1200 $$ with out touching anything else
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.
I am glad that you learned and enjoyed it, thanks!
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.
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!
Until the epa shows up to your house lol
@@shane2163 so far so good
Excellent, I'm doing the same and plan to install these for my neighbors for a lot cheaper than an HVAC "pro"!
Wish I was your neighbor I’d turn you in
@@robertlamey7612 haha to whom, and for what?
I used the Spin Flair set on my last installation. It works perfectly! I would highly recommend it
Nice, thanks for letting me know!
Excellent! You are a great service to the HVAC Community Craig. Oh yeah your book is terrific, worth every penny.
Thank you very much Lester!
Wapp nu plzz sir
I love this guy. So smart and doesn't over complicate what he's doing. Kudos to you!
Thank you for your support!
Clear, fast, detailed and directly to the point! Thanks for your detailed video!
Thank you for your awesome advices! HIGHLY APPRECIATED!!! 😎👍🍺 installed my 2 split units without problems after watching your videos! Super clear and simple!
Thanks a lot!
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
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.
Thanks a lot Todd and thanks for your support on Patreon!
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.
I have installed two zone system just after wactching your videos this was my first job.
Thanks for sharing your knowladge
Thats great! Thank you for your support!
Which mini split did you install?
Which mini split did you install?
Great step-by-step procedures Craig and keep up the good work!
Thanks a lot Stuzman!
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.
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!
Thank you so much!!!
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".
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.
@@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.
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.
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.
Another great video Craig. Thanks for explaining the 5/16 fitting.
Thanks Chris!
Excellent video . Now I understand the basics of charging a mini split. Thanks!
Glad it was helpful!
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!
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.
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!
Great stuff!!! Almost perfect! The best description I've seen so far.
learning never gets old-good job
Absolutely! We are all learning all the time, thanks!
These videos are excellent. You're really a master of this stuff.
THANKYOUTHANKYOUTHANKYOU! Going to try this on my newly installed minisplit. Will let you know.
love the two valve removal tools in tandem. great idea!
Glad you like them!
best explained charging video yet. Thanks
Thanks Craig, you're and excellent instructor!
I appreciate that!
Excellent idea with the bubbles tester cap.
Thank you!
Awesome video thanks! I always wondered what it meant to gas an aircon.
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. 😞
Great video mate,Subscribed. I worked for a union trained tech and can see you know your stuff.
Thank you very much for your time and effort
Glad to help!
Thank you Sir, you have a very straight forward explanation.
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.
Thank you for the tool list, I will order the books soon!
Great and please feel free to ask questions! The full outline of the book is available at www.acservicetech.com/ac-book thanks!
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!
Thank you very much and you would add the valve core after there is positive refrigerant pressure in the system thanks!
Verry informative, thanks for posting!!!
Clear and concise!
love the book partner! very informative.
Thanks a lot!
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
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?
@@jenklingler8169 You will be fine as long as it stays under 2000 micron in 30 minutes
Another Great Video Ordering The Book Tonight
Nice. Real pro techniques. Well done.
If you are recharging the system after evacuation and vacuum do you recharge with the valves closed or open?
Thank you, you are a consummate Professional.
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 .
Good video... I appreciate that mah brah... peace from sunny SoCal 🖐🏾
Thank you for your support!
i’m glad to see your using CPS gear, i’m about to buy CPS gauges and a 2 CFM vac pump
Splendid presentation, thanks!
Glad you enjoyed it!
Ayeeee Mr. Miyagi how have you been? It’s awesome that your still doing these videos
Hey Bobby, nice to hear from you! You can email me back at info@acservicetech.com so it doesn't get lost in the comment section. What are you up to nowadays? you doing ok?
that is the real training, subscribed!
Thanks Fred! Glad you enjoy the channel! We have resources over at www.acservicetech.com too.
Great. I wish these materials were in Turkey. But even if he's here, it's too expensive. Your stuff's beautiful.
Glad you like them!
Thanks a ton brother.
Glad to help Just Teen!
You should write a book Craig ... Lol ... Great vid as usual ... Much appreciated ...
Ha ha, great idea!!!!
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.
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.
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.
Vacuum time doesn't matter, only the vacuum level and I did a 10 minute standing vacuum test to verify true vacuum level, thanks!
شكرا اخي انته حقا مبدع في عملك
اقدر تعليقاتك I appreciate your comments!
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?
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!!
Excellent video I learn really good keep doing it !!!
Glad to hear that!
Good stuff! Thanks!
Glad you liked it!
Thank you for education
Very helpful video for coreremove valve
Thanks a lot Deepak!
Amazing video thank you . On a mini split dual zone do I need to vacuume both vapor port sides ? Or just one side
wow, good job !
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 TH-cam, 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?
awesome job 👏 thanks alot
Thanks from Bangladesh.
Excellent thanks
Glad to help!
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.
Brilliantly well presented, subscribed
Thanks and welcome!
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
Thanks for sharing this video nice tutorial.
Thanks for watching
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
Hey, thanks for the informative video. Can I ask what you did with the refrigerant left in the hose from the bottle?
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
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.
Thanks for informative video.
My pleasure
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!
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?
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.🌺
If I’m recharging a mini split that is completely empty can I leave both liquid and suction line valve open? Or does the suction valve need to be closed? Also one more thing if my unit is completely empty of Freon and I’m going to replace with proper amount. After I pull vacuum can I shoot all Freon in without turning the unit on in cool mode? Or do I need to turn it on for a few minutes and charge a little in at a time and turn it back off before low Freon error code occurs? Thank u so much for your time
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
thank's partner for sharing!!!!.
Thanks!
I would have liked to see you include an inspection of all hose seals (o-rings) in every connection and oil them as needed.
Great 👍 thanks
I'm sure my neighbors got tired of listening to this as I was looping this video while i was doing the job. Thanks
Same here. Been following all of their Videos and although i have purchased the F Gas manual, theirs is a must.
I installed a 9000 BTU Senville. A friend in the HVAC field came over to pull the vacuum. We're in Fl. and it's fairly warm right now, but his pump was a single stage and it took forever for the micro gauge to get down to around 300. Other than that, he used the same equipment and procedure as you. We ran the unit after we released the refrigerant and it is super quite and super cold. He left and is out of town, but I read that I need to run the heat at some point after initial set up for 5 minutes. I only had the unit on for about 2 hrs after initial set up on auto cool. Today, I turned it on and it was blowing cold quickly I switched the mode to heat and the fan shut off and the door on the front of the inside head unit closed halfway. I waited for a minute or so and went back to the other function and everything worked. All other functions on the remote work and everything is wired right, was hoping you may have some insight to why there's no heat? Thanks!
I'm not a tech but I recall reading that it takes 5 minutes for the air to start blowing inside because the system needs time to reset the flow of the R410a so it is carrying heat to the indoor unit instead of cold.
@@cruisemates You're exactly right. I wasn't giving it enough time. Thanks
Here in Japan most of the guys use this tool that threads onto the service port, and you attach the vacuum hose to it, then you turn a knob with depresses the Schrader valve in the service port and then they vacuum the lines and head unit. They usually will let it pump for 10-15 min. They have no vacuum gauge attached anywhere, maybe there is one on the vacuum pump but, but often no gauge at all. I spent the money and bought the two valve core removal tools you have and the CPS Micron Vacuum gauge too. I could pump down my lines and head unit to 310 microns, but after 10 min with the valve core removal tool turned off to isolate the vacuum pump, the reading was 300 microns. That should be good to go, yes?
My problem with all of this is the ability to pressure test. I don't do this full time, it is one of the many things I do here in Tokyo, another service I offer to my non-Japanese clients is the removal and installation of aircons, 100% mini-splits. I have seen a lot of Aircons installed here and I've never, ever seen anyone do a pressure test. Looking in the catalog from an Aircon supply company they do sell the nitrogen bottles and the regulators, but they cost $500 for the bottle and then $50 to refill it. I'll have to spend the money at some point, but I really don't have the cash on hand right now.
My question is, can I use CO2 to pressure test? I have that gas in abundance, I use it on my MIG welder and my wife's family run a liquor shop and I can get a smaller bottle of CO2 used for the draught beer machines easily. If I use CO2 to pressure test and then I vacuum out the lines and head unit, would that be OK?
I feel that I already know the answer and it's no, but I thought I'd ask, LOL
Oh, would Argon work? I have Argon for my TIG welder.
Love these videos, bought the E-book and I'm learning a lot.
Thank you VERY much for your time.
Cheers from Tokyo!
I don't use CO2 or argon but some techs here do use them. As long as it is an inert gas and it does not leave humidity in the lines that needs to get vacuumed out then it is ok but make sure not to over pressurize the systems though, thanks for your comments and desire to do the processes correctly for the customers and for the sake of your name!
@@acservicetechchannel I again Craig, thank you so much for the information.
Turns out I did not have the correct fittings to connect the CO2 bottle to the system, so I did not use the CO2 to pressure test.
I talked to a Japanese guy that does a lot of these mini-splits, he said that for the mini-split since there are only a total of four connections and they are very straight forward it is unusual to pressure test them. Larger industrial or commercial AC or refrigeration setups with lots of connections and joints, yes they are pressure tested.
Things are done differently here, I guess.
What he did suggest was that I do the vacuuming of the lines and head unit then I open the valve on the liquid, small line to release refrigerant for maybe 5 seconds, into the system, then close the valve again. Then I could do my bubble check on the joints, but he thought this was overkill.
Using the two valve core removal tools and the CPS vacuum gauge I vacuumed the lines and head unit. I got it down to 54 microns, (took a picture!) and then I isolated the vacuum pump from the system and waited 10 min. The gauge normalized at 100 microns. I then waited another 10 min and the gauge still read 100 microns.
I did just like you show and I isolated the vacuum gauge with the 1/4" valve removal tool and then I opened the valves from the compressor unit to allow refrigerant into the lines and head unit.
Question, do you usually hear any sound when you do this, like a gurgling sound? When I did it there was no sound at all...?
I then replaced the valve into the service port, had to push fairly hard against the pressure in the lines, but it worked, I checked the valve for leaks, there were none. I then checked the other flare joints for leaks with the bubble stuff, no leaks.
Good to go, the client is happy and so am I, your setup works really well, and super slick.
Thank you again!
Cheers from Tokyo!
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?
You Are My Hero
Thanks
thank you so much , its very good
You are welcome!