Charging Refrigerant from your Gauge Hoses back into the System Before Disconnecting! Explained!

This is how to charge refrigerant out of your hoses and gauge set back into your ac unit before disconnecting. This procedure for disconnecting your hoses and gauge set needs to be done in order to make sure that you don't pull out excessive refrigerant every time you attach and disconnect your gauge set.
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[@gtakinggaming2099]

How do you get your gauges back to zero like getting liquid and vapor out of hoses

[@andydepiazza2142]

I don’t even know where to start to say how much I’ve learned from you!! Seriously, thank you for these videos! Hopefully one day I’ll be as good as a tech as you! Thank you!

[@acservicetechchannel]

Thank you so much for your kind words! I'm truly humbled by your appreciation. I'm glad that my videos have been helpful in your learning journey. Remember, becoming a skilled technician takes time, practice, and a passion for learning. Keep up the hard work, stay curious, and never stop seeking knowledge. I have no doubt that with dedication and determination, you'll become an exceptional technician!

[@jimbola77]

man you are great I'm hooked on your video's I take so many notes memorize over and over and re watch you are so patient keep up the good work I have learned and accomplished so much from you thank you!!!!!!

[@acservicetechchannel]

That is really great to hear. Thanks for letting me know!

[@drummerdem50]

Excellent procedure, clear and precise, another superb upload. Thanks for making the effort to upload quality videos.

[@acservicetechchannel]

Thank you!

[@sbitschy]

Awesome video. Learned a few new better practices to try out. Thanks for raising the bar in the industry

[@acservicetechchannel]

Thanks Steve!

[@briancrane7634]

I've never seen this 'emptying' procedure before. The techs I've seen always just hook up the bottle and charge. But the way you do it makes perfect sense. I think you're doing it right and those other techs are missing a step. BTW are you using a throat-mic? There's no background noise from the AC if so good job!!! On the other YT videos it's really hard to hear the tech over the noise. You're doing every detail exactly right! I love it many thanks again!!

[@acservicetechchannel]

Please check out my other videos either in the All AC SERVICE TECH videos playlist or one of the specific playlists for a certain topic. So far there are 92 videos to date since the end of Feb 2016. They are all the same quality videos, full of info. I want to make sure that all of our 1000 subscribers to date take the opportunity to check out the previous videos because they are all important topics and procedures. I often answer Subscriber questions with the links to the video that will answer their questions. Actually I have made many videos due to questions that our Subscribers have!Thank you very much for you Appreciation!These videos may answer some of your questions!recovery-----kzbin.info/www/bejne/nWO0dWuKn9yFfrednitial weigh in----kzbin.info/www/bejne/pJTKfXePp9uBbNmkump down---kzbin.info/www/bejne/fIjPqIeYn8iHsJqqacuum----kzbin.info/www/bejne/pHOmiIydeMihpqc

[@fortinosuarez7962]

Very good. God bless you. Everything I know about charging refrigerant. I learn from you. Thanks.

[@clevc112]

Did this and hvac instructor told me that this doesn't need done. I will still do it because it is needed.

[@rubensz0671]

Thank you ACServiceTech! You are going to help me be a great professional hvac service technician soon!

[@acservicetechchannel]

Glad to help Ruben!

[@gaffer2069]

I have heard many different opinions regarding using the same manifold gauge and hoses for different refrigerants. What is your view of whether you need to purge lines, have different manifolds for each refrigerant, or doesn't matter?

[@pauljamilkowski3672]

I’ve heard the same things. Many contradictory opinions on the subject. I’m starting out and can’t afford two sets of gauges so I’m sticking with one and am going to make sure I purge after every service I do

[@mfps1nfiv]

Question: What you do with the leftover approx. 100 PSIG refrigerant closed up in the low pressure line after disconnecting? Is this considered as a minimum loss everytime you hook up your manifold set, or do you recover this bit behind the scenes in a container? Thanks!

[@LC-qi5ff]

Good question. Can someone please answer?

[@benbass9366]

Di minimis

[@phillipwoods5874]

first let me say that i am new to the field (6mo) and i find your videos very informative. in school they taught us to purge the hoses as we hooked them up. you only purged the blue and yellow lines to put the liquid back into the unit. sorry, i am a little confused. Thanks

[@acservicetechchannel]

Great Question! You will always purge the hoses if you are going to put refrigerant back into the system so whether you do it first or right before you add the refrigerant, it doesn't matter as long as you do it. Thanks for the question!

[@davidwisniewski1505]

Excellent! This video helped a lot.

[@acservicetechchannel]

Glad to help!

[@lig1241]

Great video ! Just one question: If the air in the red line is not purged enough and the leftover air goes into the system (compressor), what will happen? Thanks

[@acservicetechchannel]

It reduces the effectiveness of the saturated states to absorb and reject heat and will increase pressure a little, thanks

[@gonzaloochoa7823]

Very professional.. many thanks for posting

[@acservicetechchannel]

Thanks Gonzalo!

[@devinchavez9851]

Love your videos very well explained.

[@silvioatejedor]

Why the pressures are present on your gauges after you disconnect it all thanks for your great videos

[@acservicetechchannel]

That is just the vapor left in the hoses after charging the liquid back in, thanks

[@hasi812]

Ithis really help , do not waste the freon in the air

[@acservicetechchannel]

Thanks Adrian!

[@proanswers]

I recommend getting smart HVAC probes for just CHECKING refrigerant to avoid taking unnecessary refrigerant and or the need to sweep the guages. Athough most smart probes dont have loss-less fittings you can add a Yellow Jacket seal right loss-less fitting to the probe. Additionally you can charge through probes.

[@acservicetechchannel]

I did some videos with the fieldpiece probes as well as the yellow jacket quick connect test gauges and yes they are great for preventative maintenance when checking the charge, thanks!

[@Kevin-ib4gv]

Hi Craig...Love your videos but I have a question. If you purge sometime AFTER you've hooked up your hoses, and not within the first second or two as you hook up each hose to the king valve, isn't there a mixture of air/refrigerant in the hose that would require more of a purge to get the entire hose cleared of mixed air/refrigerant, say 3 oz worth on a 5 ft hose, that would need to come out for a completely air free hose? I seem to think you're thinking of a completely separate air/refrigerant boundary between the two, as that 1.5 second purge would suggest, and I'm not sure that exists, or does it? Thanks Craig

[@jimj7571]

Yeah, he’s teaching how to put air into the system.

[@aaronjamison7007]

Do you just keep that small amount of vapor refrigerant in the gauges all the time? Just make sure you purge it as needed before charging? Or do you have to release it before moving onto the next system? Thanks!

[@acservicetechchannel]

I release the small amount of vapor to avoid cross contamination when possible, thanks!

[@HowToDoitright]

Excellent videos but one question. I noticed to purge you also opened up the vaporizer on Suction line but I didn’t hear any gas coming out? Doesn’t that suck air inside as vapor line is a suction line? Wouldn’t it had negative pressure and suck moisture in instead Of purging refrigerant out?

[@williammarik6159]

I thought the same thing . (?)

[@jamesrockford5145]

Another great video. When you are throttling the liquid back to the suction line, I can't tell should the condenser be running, or does it even matter? much thanks

[@acservicetechchannel]

Yes the unit should still be running so there is a low side and a high side, thanks

[@jayviz]

Great video, but since this procedure takes place after taking readings, wouldn't the blue line already have be purged? Also, after you moved the liquid from the red line into the center of the manifold, you purged the yellow line. So what was the point of purging the blue line after that?

[@acservicetechchannel]

You can purge before or after checking the charge before performing the disconnect procedure to charge the liquid in the red hose back into the system, thanks!

[@annewasserman2074]

@@acservicetechchannel ;

[@GoutamDAS-ls1wb]

But this means that you will always lose a little refrigerant because when you disconnected, the pressure was around 100 psig--in your plumbing and manifold, right? I guess you could charge them back in with something like a refrigerant recovery unit which would compress the stream as it enters the low side.

[@jewdali1]

CAN NOT WE USE PUMP DOWN TO EMPTY COMPLETELY THE GAUGE MANIFOLD ? SOME GAS PRESSURE REMAINS IN THE GAUGE , I SAW A FRENCH VIDEO WHERE A TRAINER DOES IT . THANKS FOR THE VIDEO

[@acservicetechchannel]

That is a great question. The problem is doing pump downs on split systems like this adding excess strain on the compressor and often times when the compressor is older, I find that the internal pressure relief valve blows before it even gets close to 20psi. If you want to avoid the purging and then the disconnect procedure, you can use quick connect test gauges instead, thanks

[@jerrellstrawn6409]

Excellent video.

[@acservicetechchannel]

Thanks Joe!

[@Ok-ci3lg]

Thank you so much my brother.

[@acservicetechchannel]

Any time. Appreciate the support!

[@JD-ks6mo]

Do you have to remove liquid vaporizer when adding r-22 since it is charged as a vapor

[@acservicetechchannel]

You don't have to take it out but it is a restriction, thanks

[@hvacberan]

is the unit on during this process? thanks again for great tips

[@acservicetechchannel]

Great Question, yes absolutely it is just my camera that cancels most drowning background noises out. In some videos you can hear the unit and others you cant. I depends on the sound decibal. The only time you can charge when the system is off is after pulling a vacuum of 500 microns and then weighing the refrigerant in as a liquid into the liquid side with a scale. Thanks for the Comment!

[@annewasserman2074]

@@acservicetechchannel /h

[@annewasserman2074]

@@acservicetechchannel 0

[@bradmironik6137]

I understand charging procedures but after the manifold pressures equalize what is left in the hoses? Is it just a tiny amount of vapor? Thanks for all the good videos.

[@acservicetechchannel]

Yes exactly, it is just a small amount of vapor left instead of any liquid or sat state, thanks

[@Swenser]

Without this recirculation process, for a short,new line set , how many times could you hook up gauges for testing before the loss of gas would cause malfunction?

[@Arieldny]

Thanks for the great tips. But i have a question, won't you also have vapor refrigerant in the blue hose ? you were able to save liquid refrigerant in the red/yellow hoses, but then how about the vapor refrigerant in the blue hose (you still had a reading of 100 psig)? i guess is almost impossible to save vapor refrigerant as well or may be wrong, please clarify my thought. thank you.

[@jimbola77]

this takes a while but it is well worth it at least u r not losing all that refrigerant I see it done all the time laziness!!! or inexperienced?????

[@acservicetechchannel]

You would be surprised, a lot of people just don't know. Thanks

[@fastlife866]

thanks for the video

[@jameswestii454]

Man, I love these videos. So after I pull my vacuum on a new install and using these exact guages and hoses for everything since I just can't afford the core removal tools yet and I break the vacuum with refer to add what I need for over 15 feet of lineset, open service valves and then let systems run for 10-15 minutes and check sub cooling since I have a TXV. There will be refer in the yellow line. Is this process the same and/or okay? I just heard you say in the video about the yellow line being empty and it made me wonder if I was missing something. This goes along with a question I asked you earlier about zeroing out the scale after refer was in the yellow hose before opening high side to add charge. Not sure how much is in a 60" hose but could that extra really hurt anything? Thanks for your help with repetitive questions, lol.

[@acservicetechchannel]

I try not to overcharge the system so I stop adding once I am at the correct subcooling so that the amount in my yellow and red hose will go into the system and increase the subcooling by 1 to 2 degrees on a normal size residential ac unit, thanks!

[@jameswestii454]

Thank you.

[@joshuamaldonado29]

When purging air from yellow hose before returning refrigerant back to the system, wouldn’t the air be pushed to the low loss side of the hose? Since when you open the red handle, the liquid refrigerant pushes into the yellow hose?

[@michaelforman6292]

Love your videos. How do you remove the hoses, where you use the superheat method and you added refrigerant? Seems to me you will have refrigerant in the yellow hose and you might as well reclaim that too. I didn’t know how to do it so I just made sure my manifolds were closed and then removed the yellow line from the manifold. Also, how do you clean the hoses out? I’ve got some drips from them and don’t want to store them dirty. With your videos, I was able to charge my system for less than the price of a service AND I got some gauges, a multimeter and refrigerant in the process.

[@acservicetechchannel]

Thanks Michael, just make sure you are EPA 608 certified to handle the refrigerants. Check out the "acservicetech connected check charge, disconnect procedure" thanks

[@artisticmomentum6660]

So without the portable liquid vaporizer I would quickly open the low-side line for a second or so at a time to feed the refrigerant through? How long do I safely wait before feeding more refrigerant? Thanks, great video! Subbed.

[@acservicetechchannel]

Open the low side just a little bit for a second or two and shut the handle. Wait a minute and do that again while monitoring the weight with a scale and the charge with either superheat or subcooling as needed, thanks!

[@artisticmomentum6660]

I see. Thanks!

[@truckinforever985]

So after adding refrigerant the process of putting it back is the same , just that you have more refrigerant in the lines, and to stop adding early so you can put what is in the line back in

[@acservicetechchannel]

Yes but I will just say that it is really hard to gauge and the reality is that if you are doing the subcooling process and you already have your high side line disconnected then you can't really check your subcooling anymore unless you had a temp sensor taped to the middle of the outdoor condensor coil to give you the sat temp if that makes sense. I mainly use this process for connecting, checking the charge, and if it is good, charging the refrigerant back in the low side before disconnecting. Thanks trukin forever!

[@jameswestii454]

Just to be clear one final time and in response to the question from Barry G. After I pull my vacuum to 500 microns or less and verify no leaks and I then break the vacuum with my 410A to add whatever is needed for over 15 feet of lineset into the high side. I shut off jug, close valve on yellow hose, disconnect yellow hose from jug and hook back into guage set. Open service valves, set stat low for cooling, turn on power and let unit run for 10-15 minutes and check subcooling. If subcooling is correct then I shut valve on high side hose and disconnect from service valve and hook back into guage set. At this point I have product in red hose along with product in yellow hose from breaking the vacuum. Are you saying I am ok to do this process in this video to empty both hoses back into low side? Pressures/readings that I obtain do include what's in hoses correct?

[@Persephales]

Im confused though. Isnt the whole point of this procedure to prevent refrigerant theft from the machine? But when he disconnected his hoses the gauge still read a pressure of 100psi If the lines were empty shouldnt they read zero? What am I missing

[@NMranchhand]

That’s interesting. Could you hazard a guess as to the weight of refrigerant that is contained in the hoses before you start this removal?

[@acservicetechchannel]

Well liquid r-22 is about .6 ounces per foot of 3/8" line so a 5' hose would probably be about the same internal diameter so maybe 3 ounces which is a lot when you think of it, thanks

[@NMranchhand]

acservicetech Yes, it’s more than I had imagined. Thank you. (I’ll be careful, then)

[@FernandoGarcia11122]

AC Service Tech LLC would I do the same steps if after I charge the system ?

[@scottm3552]

does the system have to be running to put the vapor back in the suction line?

[@acservicetechchannel]

Yes, thanks!

[@scottm3552]

@@acservicetechchannel what type of refrigerant was thats system using?

[@jimbola77]

super video thank you for sharing!!!!!

[@acservicetechchannel]

+jimbola77 Thanks!

[@sakitlikod1]

I have a 3 1/2 tons unit by trane installed 1992 (r22) and I haven’t check the pressure low and high side since I had it. I have gauge made by yellow jacket and I do have a ampere gauge and I still have some r22 left in a 30 lbs tank. Can you please advice me on how to check and step by step procedure if the Freon is enough in the system ? I feel like the central ac is not cooling in full capacity, I loved to learn doing my own maintenance ,thanks in advance

[@acservicetechchannel]

Look up "acservicetech superheat playlist" and "acservicetech subcooling playlist" It will depend on the metering device which is used, thanks!

[@gwensteele8404]

In watching u bleed the yellow center hose I noticed that u bled the front of the yellow hose ,what happened to the air trapped in the back of the hose.Should u not have bled the yellow hose that was hooked to the back of the manifold to get the trapped air out?please let me know if just bleeding the front gets rid of all the air in the yellow hose.i know u know what ur doing and I appreciate all u teach me,just a question in my mind.

[@acservicetechchannel]

Actually, it is better to bleed at the other end of the yellow service line to be sure and is what I am presently doing. Make sure that you have an on/off so the refrigerant in the line can be controlled. It wouldn't work with an auto disconnect fitting on the end, thanks

[@truckinforever985]

Do you tape your sensor to the bottom of the liquid line, and how may times around with electrical tape

[@acservicetechchannel]

I usually do 3 wraps or so. It also helps if you armoflex insulation over the sensor so you don't have heat from the sun or from ambient. The side is probably the best spot but the liquid line is very small so it won't matter too much. The side of the liquid for subcooling. Thanks

[@dannyrockstroh6552]

After the gauges levels out, and you've only got the suction line hose attached, are your hoses completely empty or is there still vapor refrigerant in your hoses? And if there is still vapor refrigerant in your hoses after complete disconnect, what do you do to evacuate that refrigerant?? HVAC student here. And I cant seem to find a video that explains that bit 100% or am I just missing something.

[@acservicetechchannel]

So it is only a small amount of vapor refrigerant still left in the hoses and that falls under the de-minimus rule which means that the small amount can be vented during normal service, thanks!

[@truckinforever985]

If I did add 410A with a kwik charge and I then wanted to put the refrigerant from the lines back in the system , would it be the same set up as you are showing in this video

[@acservicetechchannel]

Yes but just remember to not add too much refrigerant into the system. The red and yellow line at this point would be full of liquid refrigerant which is a lot. You would need to stop adding early before reaching your subcooling needed. I mainly use this method when checking the charge, not adding any and then purging the air and charging the red side back into the blue side before disconnecting, thanks!

[@Greenenvelopeaire]

Does this apply when charging a system? Everytime I charge a system I'm always left with refrigerant In my houses. Shld I recover the refrigerant in to a recovery tank or do I can I use this procedure and simply put the refrigerant back into the system through the sanction line with the system running? Can u break a vaccum and charge a system while it's off? I wld hate to ruin the compressor by trying to run a system while it's in a vaccum and free of refrigerant?

[@Clitcommander6969]

You shouldn’t be left with any refrigerant in your gauges or hoses. You’ll leave units undercharged. If it’s a critically charged unit you are ruining it. Here’s a guide Don’t even bother with the service line. Keep it parked. 1. Shut off your high side valve. 2. Open your high side knob. 3. Open your low side knob. 4. Shut off your low side valve. 5. Disconnect low side. 6. Disconnect high side. Enjoy

[@jimmyung3212]

Thank you!!!

[@acservicetechchannel]

Thanks Jimmy Ung!

[@ddcws1]

I knew there was a way to do this but I couldn't remember the steps. I ordered the yellow jacket liquid charging adapter what do you think about that one? I started doing residential install about three weeks ago and I love this kind of work. So do you have any recommendations for some tools that would come in handy. Also when when I put back the schrader valve after brazing how tight are they supposed to be. I have noticed when I remove them they seem pretty loose so when I put them back I snug them. I don't want to over tighten but I am afraid they might be to loose. Thanks man.

[@acservicetechchannel]

I like the kwik charge a lot more. It really seems to vaporize well compared but that would help. I have the yellow jacket ones in the shop but we seem to rely on the kwik charge due to not hearing any compressor noise change and being able to open the handle longer but once again the one you have will do. Just charge a little at a time. Awesome to hear that you are enjoying it. Did they put you with a good tech as a team or are you working just yourself? You could check out the tool list at --acservicetech.com/hvacr-tools/ -- you could also look at this video and some tool links are in the description - kzbin.info/www/bejne/mpankIKgibxgns0 --- Most tool links from the videos are also in the descriptions. I am working my way back through them and updating the lists. In reference to valve cores there is a tool to make sure you don't overtighten - amzn.to/2qL1C6w -- Make sure you have extra schrader valves if you go doing any service. I seems every one out of 5 units lately one valve is not reseating very well. Thats crazy. Make sure when it is time to get a manometer later on that you get a digital one. Those pressures are so small and you can use it on pressure switches and variable speed unit gas pressure- Here is a link to the Fieldpiece SDP2 Digital Psychrometer- amzn.to/2nniMVR -- Feel free to ask questions, thanks!

[@ddcws1]

Thanks for the reply. Yes I am working with another installer. He's pretty good. The Compnay I work for tries to put people together based on where they live. So both of us live on the same city so it worked out real nice. The city I live in is fairly small so I meet him at this grocery store near where I live and we ride together. This is in reference to your comment about the schrader tools I do have 3 different tools to remove the schrader valves. One is a key chain tool another on is in my 11 n' 1 and the other is the one you use for servicing or when you pull a vacuum and such. I don't have the one you shared but that one seems like it would be helpful for me at least until I get the feel for it. You mentioned the valves not seating properly are referring to when you put them back in and after you have charged unit they leak? If so that same thing happened to me the other day and the guy I work with showed me a trick. Really quickly you press on the schrader valve and the pressure from the refrigerant will push it back into place. I thought I had a bad one and I was about to replace it until he showed me that. Learn something new all the time. Again I really do appreciate your videos and all your replies. Thanks.

[@alfredcasasola]

I'm a little confuse on this procedure. Why didn't you purge the air through the ball valve at the end of yellow line but purge instead at the center of the manifold. Wouldn't you have air trapped in the yellow line by doing this procedure. This procedure seems confusing. Your explanation would be greatly appreciated.

[@LC-qi5ff]

I think the ball valve is at the front of the yellow line (close to the center of the manifold)

[@mark.r8900]

hi, i saw a video where the tech hooks up low and hi side hoses to check pressures. but as soon as he removes the low and hi hoses from the condenser service valves the pressures on the manifold dial goes straight to zero. that's funny because when i remove the hi and lo hoses from condenser service valve the pressures stay the manifold. just like your demonstration here. am i missing something? thank you.

[@acservicetechchannel]

The tech probably does not have automatic or manual low loss fittings like we use, thanks!

[@salcido51]

Can I do this without the vaporizer or do I need the vaporizer to charge back the refrigerant that’s in my hoses?

[@acservicetechchannel]

You don't have to if you do it slowly so the compressor doesn't get fed with liquid, thanks

[@theackid7887]

dont you think there is still air in the yellow hose even after you bled it off? id think you have to bleed the other side of the yellow side where the ball valve is.

[@acservicetechchannel]

That is mainly what I am doing at this point to make sure, thanks

[@jimbola77]

is unit off while charging??? and doing this method??? thanx partner.

[@acservicetechchannel]

The unit is on, my mic cancels out background noise.

[@DaxLLM]

Bought a mini ball valve set the other day and my question is do I have to remove the valve depressors on my yellow jacket manifold hoses in order to get better flow? Or can I just leave the depressors in as is and hookup the mini ball valves directly to the stock yellow jacket hoses? Thank you

[@acservicetechchannel]

If the mini ball valves have valve cores in them too then yes I would pull our the other ones, thanks

[@DaxLLM]

acservicetech thanks!

[@Keegeth]

How many ounces does a normal analog gauge even hold? I ask because I’m questioning if this is even worth it.

[@josemj059]

acchannel.what about, the freeon on the Gauges.they still have refrigerant inside.there's no way that you can put that inside the system.?

[@acservicetechchannel]

After doing the disconnect procedure when you charge the liquid back into the system, then you only have a small amount of vapor left which is vented after the disconnect. This is called de minimis, www.epa.gov/section608/stationary-refrigeration-prohibition-venting-refrigerants

[@noemiaguilar2285]

What type of Refrigerant is in that unit that your are demonstrating on?

[@acservicetechchannel]

That was R-410A, thanks!

[@noemiaguilar2285]

@@acservicetechchannel What type of metering device is in the unit? Again thank you for the response!

[@greygoosemafia]

I htink I have a r12 gauge set up and got those 134a adapters. Is it normal for a high pressure side to suck in refrigerant in the red hose with the valve closed?

[@acservicetechchannel]

The handles on gauges shut the yellow service line off from the red or blue line hoses. If there is a valve on the hose, it should hold the refrigerant back, thanks

[@greygoosemafia]

I have a little different set up than you. I have an imperial 4 valve manifold. i noticed when checking my 134a pressures i got a l little bit of refrigerant in the high pressure line with the valve closed. Is that normal? I read in a forum that you open both high and low sides on the manifold shut off the the adapter and let the drain through the low side and back into the system. I'm just curious if that is normal for the manifold to pull in a little bit of refrigerant? It's not a great deal... of it. Just wondering maybe I need a valve repair kit? I'm just not sure. thx Great videos btw

[@DaxLLM]

Question... Why doesn't both gauge pressures drop to zero after you shuffle the refrigerant back into the system? Thank you...

[@acservicetechchannel]

When the system is off, the refrigerants equalize and return to the saturated temperature of that particular refrigerant at whatever outside temp it is. This is not a pump down system.

[@acservicetechchannel]

Thanks Razor1964!

[@sivucit]

Hi, i thought the low side vapor is still in the hose and you were able to put the liquid back to the system because liquid side has more psi. In other words if i connect the hose only on low side and not on high side, the vapor that is there on low side will never go back to the system, is my understanding right.

[@TheBlacksanta78]

Does this apply to automotive (R134a), as well?

[@acservicetechchannel]

A compressor in a car can ramp up or down so we used the total weight method to charge in a car as seen on the spec plate for total refrigerant weight used after a vacuum on the empty system, thanks.

[@TheBlacksanta78]

OK. What I was getting at was, after the last tenth of an ounce of refrigerant is removed from the charging can or cylinder that completes the required weight or capacity the system requires in an automobile, does the remaining refrigerant in the manifold high pressure hose and charge line have to be fed back into the system through the low side of the manifold, like you show in the video? Isn't that refrigerant part of the overall system weight?

[@joemorales9093]

Is unit running or off when doing this?.....

[@acservicetechchannel]

That was running. My mic cancelled out the compressor and fan noise, thanks

[@tino8080]

is this the same procedure using r22?

[@acservicetechchannel]

Yes just using the r-22 pt chart on the gauges

[@tino8080]

acservicetech....ok thank you sir

[@AdrianButler86]

Love it

[@acservicetechchannel]

Thanks adrnb237!

[@Clitcommander6969]

Man you made this really complicated. Don’t even bother with the service line. Keep it parked. 1. Shut off your high side valve. 2. Open your high side knob. 3. Open your low side knob. 4. Shut off your low side valve. 5. Disconnect low side. 6. Disconnect high side. Enjoy

[@OrganPianoGuitar]

I see you purged the air at the yellow refrigerant line, which I understand, but why would you purge the air out of the blue low side while the unit is running? Wouldn’t that suck in air?

[@acservicetechchannel]

The low side is higher than the outside air so I needed to get the air out of that line too before adding refrigerant, otherwise I would be putting it into the system, thanks

[@OrganPianoGuitar]

acservicetech Thanks so much for your quick reply, I really appreciate all of your videos very much! Just a follow up question; wouldn’t that normally be covered if you purge the hoses when initially putting the gauges on and doing a purge the? Or do you have to do it again for this procedure?

[@acservicetechchannel]

Just once is fine but if you never did it yet, you need to before putting refrigerant back into the vapor side, thanks

[@OrganPianoGuitar]

Thanks again! I am halfway through Hvac school down in Southeast Florida and really appreciate all of your contributions and regularly share links with my fellow classmates!

[@Rueuhy]

So you're not supposed to kill wasps and other insects with the leftover refrigerant in the hoses? Calm down everybody, just kidding!