Charging an R-410A AC Unit that is Very Low on Refrigerant with the Subcooling Method!

In this HVAC Training Video, I show How to Add R-410A into a Running Air Conditioner that is Very Low on Refrigerant. I Show the Step by Step Procedure for Connecting the Hoses and Manifold Gauges, Air Purging, Charging Process, Digital Scale Use, the Subcooling Method, Total Superheat Method, What Happens to the Pressures and Temperatures as Refrigerant is Added, How to Charge the Refrigerant from the Hoses Back into the System, and How to Disconnect the Gauge Set! Supervision is needed by a licensed HVACR Tech while performing tasks as Experience and Apprenticeship garners Wisdom and Safety.
Tools Used In This Video
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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.
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#hvacr #hvacr #hvactrainingvideos #hvactraining #hvactraining101 #acservice #acservicetech #subcooling #r410a #methodology #stepbystep #manifold #refrigerant #hoses
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[@deanmartin1966]

Is it weird that I never watch regular TV anymore. Just Hvac KZbin videos. Lol. Great info. Thanks for sharing. I love this channel. At 55 I still love learning from great teachers like Craig.

[@shawnjohnson8478]

Me too bro

[@kennethlobo4420]

Absolutely

[@acservicetechchannel]

Awesome its learning, retaining, and being open to new methods vs just tv entertainment, so I think that's awesome!

[@deanmartin1966]

@@acservicetechchannel Regular TV is depressing. KZbin is a wealth of information.

[@dachmen]

Haha there u go Bro I’m in that process as well keep on you can do it Great God Bless

[@hunter00143]

Signed up for the HVAC program at my local community College and it starts in only a month, got my textbooks and been reading ahead and watching these videos is very helpful. I already understand the basic refrigeration cycle so thats pretty cool

[@acservicetechchannel]

awesome!!!

[@nickledimez4012]

I had to pause the video to say Thank you! I’ve encountered several so called teachers whom seem burnt out or miserable. Even co workers whom just do t want to teach as well as to learn. Thank you for instilling Sense of confidence in your viewers, I’ve purchased your book look forward to your new videos. You are making a difference in peoples lives.

[@acservicetechchannel]

That really is encouraging to hear, thanks!

[@patrickfellure8603]

​@@acservicetechchannelyour vids are a godsend

[@wilfredovega577]

Ty for another amazing video of setup, charging safely disconnecting hoses after finishing.

[@acservicetechchannel]

Thanks a lot Wilfredo!

[@fernandofrancisco3106]

I just love the way you explained everything. You make it look so easy. Thanks Craig for everything you are a great teacher.

[@acservicetechchannel]

Thank you very much Fernando!

[@michaelstaley9979]

Great video. Thank you for the clear explanation on charging a 410A system from start to finish.

[@acservicetechchannel]

Glad you enjoyed it Michael!

[@edlauren9434]

This video brings some nostalgic feelings... This analog pressure gauge from Yellow Jacket.... Last time I've used mine was a couple of years ago. Nowadays it is easier just to get a digital gauge with temperature probes that would calculate superheat and sub cooling automatically..:) Thank you!

[@vw_mods_4711]

Yeah I think he does it with basic tools just in case people don’t have digital. Wouldn’t really be a training video with digital bits working it all out for you 🤣 but yeah the new tools are great 👍

[@juanluisjimenez2996]

Your book is amazing, I bought it and I love it, I have learned more than what they taught me at school…

[@superd0fad0]

PRICELESS!! I've been looking for a video on how to charge an R410A system and I finally found it, step by step. Craig, thanks for sharing your knowledge.

[@josephguida5432]

I can’t understand why your “soup-to-nuts” video got about 1.6M views and this one only has about 52K (as of Aug 1 ‘22). I’ve only had your 229 page book for 10 days but that book used together with your videos is obviously the best way to learn HVAC. I’m planning on buying a 12000 btu inverter heat pump and a 12000 btu cooling only split unit just for the purpose of experimenting with all the different recovery and charging methods you described just to compare the outcomes. It will probably cost a few thousand to get all the good tools to do all that but it’s definitely worth it.

[@ducharmehvactraining925]

Great job Craig always enjoy your training

[@SSS-xq1lg]

executed with finesse. very very great.!!

[@quentensims415]

This was an excellent training video on how to charge a system with 410a using the subcooling method!!

[@acservicetechchannel]

Thanks a lot Quenten! Make sure to check out the free articles at www.acservicetech.com in reference to total superheat and subcooling, thanks!

[@marklennon1580]

You have been blessed to have the knowledge you have and more importantly the ability to communicate it in a way that’s easy to understand. I have been watching and learning from your videos and it has inspired me to take the 608 exam which I passed and now hold the universal certification from the EPA to legally purchase refrigerant. Thank you Craig for sharing your knowledge and expertise with all of us. Ps: your books are awesome- I reference them frequently.

[@acservicetechchannel]

That's so awesome Mark! Thanks for writing the note!

[@davidgearardo1788]

@@acservicetechchannel so this is the charging method using subcooling on a heat pump with a txv,? just to be clear I know it’s been a while but my new property has heat pumps with a txv.

[@sarbbhamra6758]

Can you please tell me , how do I get those books. I live in Toronto Canada

[@TheAlamadis]

Thanks Craig for the tutorial 🙏 you made it so easy to understand .

[@JaimeMartinez-hd2dk]

Excellent, much appreciated 👏

[@jonathancarbajal5588]

What a nice video I’m new on hvac field and this videos had help me a lot thanks for making them

[@Demp96]

How can you be sure that the 410a left in the system is still the correct blend and won’t effect performance?

[@realestateservicessaleshea99]

FIRST I'm glad you used analog manifold gauges some of these channels act like analog never existed!🤯 I never heard the emphasis on clean filters & clean coils on Airflow, but good video. 🥃🥃🍺🍺🍺🍿🏌🏻‍♀️ Stay safe. Retired (werk'n)keyboard super tech. Wear your safety glasses.

[@acservicetechchannel]

I thought I mentioned it quickly before hooking up the gauge set. I did other videos on the full process for measuring the cfm to verify you have the 350-425 cfm required depending on the desired dehumidification level, thanks!

[@ZeddZul]

Great video. Very informative!

[@kyletice811]

The Noise! 😮 sounds like a video game representation of a supercar sound.

[@acservicetechchannel]

The air conditioner is running.

[@user-mc4ui6up2u]

Ur techings help me alot in the field .thank.

[@Muslim9414]

really nice explaning thanks

[@user-kt2hb8xr3p]

Great job, thank you brother. You are so talented

[@acservicetechchannel]

Glad you enjoyed it!

[@epd807]

Very good video! Thank you!

[@acservicetechchannel]

Awesome, thanks!

[@rbedell3151]

Excellent Video.

[@sarbbhamra6758]

Thank you so much for making this video.

[@acservicetechchannel]

Glad it was helpful!

[@zyxnix]

Dude, by far the best videos.

[@thesilentonevictor]

Great educational video

[@acservicetechchannel]

Glad you enjoyed it!

[@ronie1337]

Excellent.

[@williamserver4332]

Great video

[@kennethlobo4420]

Great video as Always

[@acservicetechchannel]

Thanks a lot Kenneth!

[@455supreme]

I enjoy your videos; I am in school now learning HVAC. It does make it a little confusing with thermocouples' on both the suction and liquid lines at the same time. I know you are pointing back and forth at the service ports, but while watching the videos my mind is jumping back and forth between sub-cool and super heat as to which line I need to watch the thermocouple temperature. All good info, just make me confused because of the thermocouple wire on both at the same time.

[@armangeronimo9697]

Good day sir nice tips thank you

[@francissare6080]

Thank you nice video.

[@prudenciosombra9306]

I,liked very much your,videos,,very profesional

[@chiplaurn8175]

Man… where was this video when I first started, 15yrs ago. Can you do a quick video on approach method charging?

[@acservicetechchannel]

Chip, thanks for letting me know what you would like to see!

[@ramseygrenfell8293]

This is what you do, use you temp chart and ad 20 degrees to your ambient temperature. And you will see what the head pressure should be. Plus you can use a amp probe and see what you running amps should be

[@alklapaxida850]

perfectly done video,,

[@mauroaparicio1855]

very good video

[@786hidalgo]

Amazing

[@TAXOPAREI]

excellent channel my friend ! this subcooling method is exactly the same progress at a fridge that use a txv expansion valve ? in commercial refrigerators apart from the required amperes drawn by the motor because most of the times I choose the pieces ( evaporator, condenser motor, etc )separately and join them and there is no other indication of filling with the correct amount of freon , for 20 years I have filled them in empirically without having any trouble not meaning that this is the right way !

[@vtmz9589]

Great video i would of like seen any changes in the temperature of how cold the air was blowing before and after

[@Bertjanvandermeer]

They teach us to use the compressor to purge the manifold/hoses on pumpdown. Close the liquid line, wait for it to kick off on low pressure and it should suck the last vapour (or at least as much as possible) out of your hoses.

[@thomastidwell9424]

Thanks!

[@acservicetechchannel]

Thank you so much for your support! It means a lot to us, and we truly appreciate your contribution. Your kind words and gratitude are equally cherished. It's because of supporters like you that we can continue creating valuable content and providing helpful resources. Thank you again!!

[@mhamrahi]

Any help appreciated : I have a Lenox Unit outside with 410A refrigerant. I'm following these instructions to top off the refrigerant as I know it has a tiny leak and goes low every couple years. the sticker on the condensing unit outside doesn't show any TXV subcooling number. it shows the design pressure though : Hi 446 / Lo 236 PSIG besides voltage, amperage, fan speed and other information. How am I supposed to figure what the target subcooling of this unit should be. PS : I have my EPA license and will eventually replace the unit probably next year. GREAT VIDEOS btw, very valuable information on youtube videos and the e-book. really appreciate you for what you're doing and always support you

[@johnmichaeldula5356]

Thanks for this, Sir. How about charging of VRF unit?

[@Froggability]

It’s really good you got those gauge hoses with the valves , every gauge set should be like that. but I also get mine with a sight-glass, tells you more stuff what’s going on

[@acservicetechchannel]

Yeah love those version of hoses with the manual valves, thanks!

[@andrewgilbreath1331]

Digital gauges mate I'm old school as well but man digital makes that so much easier.

[@acservicetechchannel]

Absolutely agree and I use digital sets and test probes in the field often but when teaching I am trying to reach those techs in school and first year in the field to make sure they know what a lot the numbers mean. Usually techs tend to buy the digital sets after their first few years so if they know how to use the older compound sets, in their mind, they will quickly diagnose with digitals, thanks!

[@superd0fad0]

@@acservicetechchannel.- Well said! People who have a digital gauges already know how to charge a system. Your video is mostly geared toward HVAC learners. I appreciate that!

[@98red300]

Great video!!! One question if you disconnect the liquid line but you don't have the low loss fittings like you have on your gauge set is refrigerant still in the line and are you able to service that into the suction line? Hopefully that question made sense. Great Content as always!!!

[@user-eh3qz4zv1o]

Thank you for this! Question: If I was going to use a charging adaptor on the tank to produce more of a vapor, can you just leave the low side valve cracked open for lets say 15-20 seconds at a time?

[@basspig]

So if my understanding is correct, the purpose of achieving the correct subcooling number is so that all of the phase change occurs Within the condenser and evaporator coils. This should lead to maximum efficiency.

[@selectaguru]

Question, if you would of used a vaporizer on your gages to add the 410a refrigerant in would you been able to open the manifold longer instead of opening and closing the manifold to add refrigerant in??

[@Autiger6871]

I have a 3 ton N coil with a 2 ton condenser. Does this have any effect on the way you add refrigerant when it’s low?

[@_GandalfTheGrey_]

If my gauges don’t have a closing valve at the end like yours do, would I simply close the tank valve first and then crack open the low side to let refrigerant flow from the yellow hose through the blue while the yellow hose is attached to the tank, or would i have to close the tank first then detach the yellow hose from it then crack the blue side, or does it not matter if the yellow hose is attached or not?

[@Refrigeration_Airconditioning]

Good day bro. Can u discuss the length of the pipe and how much we add refrigerant into the system? I know every brand had a design for pipeline When you installed AC. What about you will exceed the design? Or u will depend also the subcooling? Even ur pipe was long.

[@Sc19869]

To charge it always has to be through the vapor line? And does the system have to be on?

[@user-ko4pl6yk4m]

Is the sub cooling value fixed between 9-15 or does it change from one gas to another and from one air conditioner to another? thank you

[@951cast]

If it doesn't have a targer subcool what do you base your targer subcool at

[@Alfred2226]

Need this book and the chart

[@dc-wp8oc]

Thank you, Craig. Can a R-22 system be "converted" to operate with R-410a? If so, do you have a video on this subject?

[@nateg08]

No it can't. It could be converted to 407c with some work. Could use a r22 replacement though. Ive heard a lot of good things about the new Bluon r22 drop in replacement. Never liked any of the others. 421a is the only other one I might use. MOB 99 and NU22 are junk. But honestly if I had a 22 system that I couldn't or didn't want to replace I'd go to 407c. Have to change the system oil for that though.

[@acrepairnearme]

Amazing video. That's why I can't get SC differential! I always thought, why it is not rising while I'm adding refrigerant - the answer is - I need to add MORE. And Keep adding till I'll see the split differential. Interesting fact- even with a zero SC A/C was cooling great and SH was 15. Now it's more clear to me. Will apply this knowledge to practice. Also, a lot of times while I'm adding refrigerant my liquid line sat pressure rising along with liquid line temp without giving me any split differential. And if I add more it just sticks together and rising. Am I missing something?

[@acservicetechchannel]

You would need to let it sit longer to cycle through, or turn the outdoor unit off, let it equalize and then turn it back on and wait the 5 minutes before checking again. Or it lterally could be that low on refrigerant that more is needed to be added, thanks!

[@cruz47144]

On a R32 system what is the correct HG for the vacuum pressure?

[@dachmen]

Yo you guys are Awesome! very well explained God Bless you all...

[@sebastianmarino6439]

Would a severe undercharge cause pressure fluctuations? Or is that an airflow issue?

[@LK-ee9bk]

Hi, I like your videos they are very informative, I have question for you , some times when charging the system start drawing overload current to achieving the target superheat or target subcooling, when you charging a system shouldn't be better to monitor pressures , temperatures and outdoor unit current?

[@acservicetechchannel]

The only problem is that we don't have a current to compare it to so we rely on the subcooling and total superheat. The current ratings on the outdoor rating plate are not used for actual running current but one is for wire sizing and the other is the max for the breaker size. If the total superheat and subcooling are set properly, then the system will be the most electrically efficient as long as the airflow is correct. Actually check for the 350-425 cfm before charging would be the most important, thanks!

[@billgriffith9322]

Question, On a 5 ton system, ballpark, how long would it take to put in 14 pounds of r410a?

[@mtbbiker6401]

Can you be overcharged yet still have low subcooling measurement of 1-2 degrees when it should be 10 degrees? If yes, what would cause this?

[@wortwortwort117]

I've got 10 subcool and 28 superheat. Would could I be doing wrong

[@MrDenniske1]

What if unit is empty and compressor won't start? Blew the fuses at disconnect

[@mrscorpio588]

Please make a video of nitrogen leak testing. At what pressure should we hold nitrogen?

[@acservicetechchannel]

Look up "ac service tech pressure testing" I have done several videos on that, thanks!

[@tradewinds8607]

How to charge if the outdoor unit is in self-protection mode E3 from low refrigerant (MrCool Universal Inverter) and wouldn't turn on until the refrigerant is higher...seems a catch-22?

[@nessnesu6202]

On a very long line set, recommend to measure subcool at outdoor unit or near air handler?

[@acservicetechchannel]

If there is an available port at the evap coil, you can check there but also at the outdoor unit. You want to make sure that you maintain around 8 degrees of subcooling at the indoor unit.

[@mark.r8900]

Hi, my r410a with txv unit. The suction saturation temp is about 33F and suction line temp is 48F giving 15F of superheat. But why is my liquid line saturation temp is 97 and my liquid line temp is also 97. I tried adding some refrigerant but nothing changes. This is a high velocity system air handler with a slab coil. I think my suction saturation temp is also too low. Both coils are clean and txv valve is new. Any help would be greatly appreciated. Thanks

[@mikelong2856]

Does it matter if when charging your home A/c the fan only is on or should you have it on auto.Because my unit was supposedly filled up but I think just the fan was on when filling.its cool but not cold air coming from vents I have checked intake filter and condenser vents on A/C outside not dirty what could be the problem please help

[@shazlytakeaf8498]

If the Freon is low by 50%, and after discovering the cause of the leak, should I continue charging the device with Freon, or should I empty it and recharge it again because it is a mixed gas?

[@chucklake443]

👍👍

[@stevenross9271]

I have 45 years of a/c experience. With 20 of those years as a service manager, if this was performed by one of my techs without checking the system for a leak. I would fire the tech on the spot.

[@tycobb8621]

If you’ve been doing this for 45 years then I guarantee somewhere along the way you’ve done this to get someone cooling in the middle of summer until you have time to come back and do a proper repair. If you say you haven’t, you’re lying so fire yourself 😂

[@scsclassics]

Do you work on package units ? Do duct jobs or change outs ?

[@acservicetechchannel]

I do and would like to incorporate some ductwork videos in the future, thanks!

[@theaustinite5320]

If you have an empty ac what is the best way to charge it? Is it ok to add refrigerant to liquid line fist ?

[@acservicetechchannel]

If its empty, pressure test with nitrogen, if there are no leaks, vent the nitrogen, vacuum to below 500 microns and break the vacuum with liquid refrigerant equaling the factory charge into the liquid port by weighing with a digital scale, thanks!

[@theaustinite5320]

@@acservicetechchannel thank you so much for the answer, really I was doing the charge partially (70%) of the factory charge, now I know (thanks to you), I can add all factory charge as one shot in the liquid line, you may make a video to help. Thanks

[@theaustinite5320]

@@acservicetechchannel I got my books(refrigerant charging and ….) from Amazon and I found what you said in page 81, chapter7. I really really appreciate your videos and your books it’s really covering everything on HVACR. Thanks

[@stephwaylonwells3218]

👍

[@mikehankins6799]

On a larger York 25 ton, 4 stage, TXV unit that’s about 11 years old with no sub-cooling or super-heat listed numbers be checked using sub-cooling or Super-heat? Was told back in those days sub-cooling and super-heat was not used so sticker won’t have that info. Since a TXV is on unit assuming the sub-cooling would be checked? MN# ZJ300N32P4WZZ10001B How do I find those magic numbers?

[@jackfpv8904]

I'm wondering why to charge liquid to compressor suction line (LP) if you can flip the freon bottle and charge vapor what make it much safer for the compressor.

[@joeeoj8126]

410a is a blend therfore needs to be charged in liquid form if u charge it with vapor then it will fuck up the mixture ratio of the refrigerants in the botte

[@lovedavis7376]

Why didnt u convert pressure to temp when getting superheat and subcooling???

[@irham9856]

👍👍👍

[@mrgreen9086]

Would this be like charging a unit with a high heat load

[@acservicetechchannel]

It was about 81 degrees inside at the time but I don't remember the wet bulb temp we started at, thanks!

[@tedlahm5740]

13 Oz is really low? How many pounds total does the system hold? Thank you.

[@acservicetechchannel]

Each one is different and it states the full charge on the outdoor unit rating plate, thanks!

[@ToadKiller420]

Superheat for piston?

[@acservicetechchannel]

Yes use the total superheat method for systems with a piston. Even when we check the charge with subcooling, we still check superheat to make sure the txv is working properly, thanks!

[@JesusRomero-lp6zt]

Sorry guys I know this is a different topic but I got a question, can R22 be mixed with the new R422B? I know we are not suppose to but the guy at the store told me that it can be mixed is that true?

[@acomman77]

I think M099 (R-438A) can be mixed with R22

[@Gary-ts6dh]

1:53 - You have over 200psig in the system. How did you determine it was low of refrigerant?

[@nateg08]

Look up videos on superheat and subcooling. To involved to type it out.

[@mrscorpio588]

Why superheat method not used in unit with txv? And why subcooling method used in units with piston or fixed orifice?

[@acservicetechchannel]

The TXV controls the superheat so adjusting the charge won't really change the superheat if theree is at least one or two degrees of subcooling. If the piston is there, it can't control superheat so we check the charge by measuring the total superheat which is occuring at the indoor coil even though we are measuring it at the outdoor coil, thanks!

[@amineessa9573]

thank you but you were going a bit faster for our brain to process the implication of the mesures in the internal tubing

[@moosehvac3457]

What if you did all of that and your subcooling never changed? It always stayed at zero to one.

[@tmmyjay]

What if your level is so low that your scroll compressor overheats?

[@StrikerBurns]

Why not add it to the high side?

[@JaspreetSingh-te7jt]

Hi actually I have a problem with my ac it’s cooling less got it checked from tech seems he didn’t caught the problem I m mentioning the reading he took and he decided in few minutes that compression faulty without checking anything after watching this video I found my problem looks like same readings r on Goodman R410 head pr 250/suction Pr 100 he wrote 50deg SH and 14 Deg idk what it is maybe sub cooling I have called him again for expansion valve seems he wants me to change the whole ac unit as he say the compressor is drawing low amps 6amps only ac blows cold air but runs continuously what can be the cause as I can’t afford to change whole unit it’s only 4 years old but compressor is 6yrs old out of Warranty

[@David_Mash]

I would think this video title is misleading. This started over 32f. A very low charge would be under 10f in my opinion

[@arturoferrari124]

I paid $29 something and I got nothing but faulty files that's could not open I need my money back or a good files

[@acservicetechchannel]

If you are saying that you purchased an ebook from us, make sure to email us at [e-mail] with your name, order number, and rough date purchased and ask for help to fix whatever the problem is, thanks!

[@arturoferrari124]

Please someone helpme

[@marcuswillis5656]

why does he say a like that. r410ayee

[@RICHCRAIN4627]

You are not supposed to charge a low system with 410a leaving refrigerant in. This is a blend and the refrigerant leaks at different rates and pressures by the blend. you should in fact recover all the charge and add a virgin charge.

[@4o5919]

I agree but I don’t know if anyone who really does it unless it’s a bad leak