Charging a system with liquid-HVAC Online Training and Courses
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- เผยแพร่เมื่อ 6 ต.ค. 2024
- In this video, I will show you how to charge a system with liquid without affecting the compressor.
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You are really good. I’m a layman that’s interested in HVACR. Your explanations are well-paced and clear. You also explain the one-off portions of the subject like why you throttle. Most would just say “open the valve” and neglect the need to flash the refrigerant. A natural teacher.
I am sorry I just saw your message. I am glad you like the video and I hope you have been watching others. take a look at y webpage. I will be doing an electrical class in September? and I have courses on line. sorry it took me so long to see this
Such an amazing teacher, wish I had a professor like you back when I was still in trade school.
Thank you! That means a lot! That's why I'm doing my online school so that I can help more guys out there so that they will become great HVAC technicians.!
I have searched on y-tube for any video that explaining how to charge a ac unit system with a refrigerant as a liquid State...this is only one I have get....thanks lot sir ...all your video so great, simple and conceptually .
I hope if you can explaine this process practically .
Thank you! Thank you for watching, and I am glad that you liked the video!
watching here in thailand but i am Pilipino national. nice video very informative. I always watching you videos. thanks.
Thank you so much for your comment. And I'm so glad that you get to see me over in the Philippines! Unfortunately I never made it to the Philippines when I was in the US Navy. I wish I had! Thank you!
Man those paint markers drip a lot!! Amazing video, helped me recharge my walk in
You know, it is hard finding some good markers! I have tried several and it's hard to find something that is easy to use. I'm glad that I could help! And thanks for watching!
Rule 1 of anything that compresses gases, from a weedeater to a high rise chiller - "You can't compress liquid" - any kind of liquid, refrigerent, oil, water or lemonade. When you see a fuel car blow a motor, it's usually because they somehow got so much nitromethane blend into the engine that it filled a cylinder (with fuel pumps in the hundreds of GPM range, it's not as hard as you'd think). It's not that nitro is explosive, it's the fact that it's a liquid and you need a lot of it for it to work well that put those motors on the edge of "hydraulic lock". Any liquid sufficient to fill or nearly fill the cylinder or vane volume will destroy a compressor, by breaking connecting rods, vanes or drive components. In an old style belt drive open compressor, it can blow the head gasket. Thanks for making this video, for years I've heard people talk about low side charging and NOT realize the risk, especially automotive guys. They think you can weigh out the prescribed amount and then just dump it in the low side. Amazingly I've seen people actually get away with it, but the risk is very high. The risk can be eliminated by using the procedure you describe, as I have for 25 years+. Rule 2 is go slow. You want to watch the high side and temps come to spec as you go anyway. With mono refrigerants gas charge, at least near the end, otherwise, follow Julio's method of "gas charging with liquid withdrawl" Add oil very slowly if required. Subbed!
Thank you so much! Like you I have seen people add liquid straight into the suction line. One time I was working with a guy who was in a hurry dumped a bunch of liquid into the suction line, he did it very fast and the compressor instantly stopped! It was a brand new compressor that we had just put in but he did not want to listen and was in a hurry. I just told him, you need to talk to the supervisor I am not saying a word. I have been doing this since 1979 and I have seen a lot of crazy things. Thank you for your comments I'm glad you like the video! And thank you for subscribing!
This guy is seriously the best teacher
Thank you very much! I really appreciate your comments! Thank you thank you for watching!
I loved your analogy, regarding how you use your gauge valve as an inline expansion valve!
Thank you! I try to teach this stuff to guys that are in class. Especially when we do hands on, I'll try to get them to charge systems properly so they will not destroy the compressors!
You started very well , like talking to a bunch of kids, but then it got very complicated ( for me at least ). Please design some courses for kids ( very basic knowledge ). Thank you for your initiative. You are a good teacher. Gracias.
Design courses for kids? You know, I had never thought of that! That is a very good and interesting concept! I enjoy teaching specially to kids that want to learn. Thank you so much for your suggestion and your comment!
Thanks man. Helped out a lot. I've been cranking open those gauges, especially after a new compressor install. Thankfully nothing bad has happened. Keep it that way.
You are welcome! I remember being with a guy that was in a hurry and locked up the compressor by just duping a bunch of liquid in the suction. be careful out there!!! take care!
Just got into HVAC and im currently working Prevenative maintenence and I will be going to Residential soon....I want to be a service Tech and my AC recently ran out of freon...your video helped me understand so much! Subscribed and I will be calling my service tech buddy tomorrow so he can come put freon in my unit. Thanks a bunch man!
I am glad I could help!!!! You say you just started? This is a great field!!! I have been doing it for over 41 years. Good luck and keep learning!!!
@@AirConAcademy yep I started about 1 month ago. I couldn't be happier. They are moving me to residential next week so I will have my own van and ill be doing more then condo stuff. Thanks so much!
Wow - there's a lot going on here.
A lot of great beginning points.
Thank you!
You’re doing amazing with these tutorials! Thank you so much
Thank you!!!!
Wow I love you’re amazing tutorials how do I take class online
@@henocktube I am soirry I just saw you r question you can look on my webpage but I will be doing a class in a few weeks? September and a webinar in August. you will see me on here talking about it. Thank you airconacademy.com/courses-2/
Thank you for your teaching Julio. God bless, stay safe so you can teach more.
Thank you! I will. And I hope I can get more videos on here soon for you guys. Any suggestions let me know! Thank you!
Contact TH-cam and let them insert ADs into your videos and make some money to support your work and keep it up. Thank you for your efforts
Thanks, you answered my questions before I ask them. Nice video like always.
Thank you! I'm glad I could do that and thank you so much for watching!
Muy buenas lecciones, very good lessons! Thank you sir for sharing your acknowledge and years of teaching!!!
Muchas Gracias!!!! I am glad that you enjoyed the lesson and hope the other videos will help you also. I hope after Christmas I can make more!!!! Good luck out there and keep learning!
Good information. I am glad I stopped by!
Thank you so much! I'm glad you did too. Please take a look at my other videos I have approximately 80 so far on A/C, electrical, and different controls. Good luck out there and keep learning!
I have a question if you could make a video about it, it would be great. For example in the reverse defrost when the refrigerant pass after the compressor through the evap to the condenser. We usually use a differential valve when we have many evaporators if one of them only is in defrost to ensure the pressure is higher so it will come back to the main flow to the condenser. My problem is that sometimes I see 2 flows mixing up with different pressures and usually refrigerant goes from high pressure to low pressure. What prevent the refrigerant to stop the flow the other side because it has higher pressure? like in your video here u said on the high side we have higher pressure from the bottle so refrigerant will not flow. thanks plz it would be alot of help!
I believe I understand what you're asking, I have a video that covers EPR valves. Evaporator pressure regulating valve. These are used to maintain the pressure in the evaporator/the temperature in the evaporator at a desired temperature. The EPR valve backs up the pressure into the evaporator to keep it from reaching a low pressure which would drop the temperature. So we can have one evaporator or let's say one box at 40° and another box at 20°, if you had another box in the system, you could have that one set at 32°. This would be adjusted and regulated by the EPR valve. If you look through my videos, here, you will see the video I am speaking about. I hope this explains it, thank you for watching and thank you for sending this question/comment in!
Good explanation and video. But I think it would have been better if you actually showed it on a system also.
Yes you are correct. I would like to have a lab to show and explain things, like I have done at a school, BUT One thing at a time. I am doing my own thing with no sponsors and out in the field I want to get the job done. Thank you, yes you are correct. keep watching and I hope I can actually show these techniques better soon.
Stop leak would make a good video
OHH Thank you yes!!!
Thank you for your excellent explanation. May I ask a question? Do you advise the air con compressor be switched on during the charging of the refrigerant or should it be switched off?
That is a very good question! If the system is empty, you have pulled a vacuum down to 500 µm and you are still in a vacuum in the system, I always add liquid into the liquid line! This speeds up the charging process and as you're looking at the gauges you will see that the low pressure gage is going to start to rise once the two gauges are at the same pressure and no more refrigerant is going in, then you close the valves on your manifold set and start the system. Once the compressor is running and has been running for a few minutes you let the pressures settle down and then you can finish charging using your superheat or your sub cooling readings. Unless of course you are charging the weight because if you're charging the weight then you just add the correct amount of refrigerant. I hope this helps and this answers your question! Thank you for watching!
Julio your gold marker is drippin
LOL ha ha ha Thanks, I will try to wipe it up!!!
Excellent! Well explained. Thanks!
Thank you so much for your comment and thank you for watching!!!
You have your line sets backwards.
Top is the suction line....
I know what you mean. I did it that way because the lower one is insulated and most guys look for the insulation NOT the smaller or larger line. I really should have used a different picture. You are the only one that has pointed that out, very good!!!!
@Marijan Munitić Hmmmm? I had not thought about putting in the title that it will help from damaging the compressor. But yes, it will keep people from damaging the compressor and I have seen HVAC technicians ruin compressors by putting too much liquid in the system while the unit is running. Thank you for watching!
Thank you Julio for teaching.
Thank you for watching! And don't forget, keep learning out there!
@@AirConAcademy is there a way of bypassing a CLO board.....I know is there to protect the system ..but temporary I mean.
@@jorgeestrada3894 I'm not sure what you mean by CLO board?
The video is good, except your showing the service valves in reverse. I sure that was a video error . Good job!!
HA HA!!!! Thank you!!! I did not notice that when I held up the gauges! It is a regular set of gauges and yes! It is just a video error of how the video turned out. But it was a regular set of gauges! Very good that you picked that up!
Thank you for the upload sir. Keep up the good work.
Alex Zapata thank you o will do what I can!!!
Thanks for teaching and sharing.
Thank you!!!! glad you liked the video!
you explain really well
Thank you I like teaching! I guess that is why.
Thanks for the video. Very simple explanation. You explained to refilling with 410 refrigerant but When working with R22 systems the green can needs to be upside? Thanks in advance
No, when you're using R22 you can charge it with a bottle right side up so that gas goes in. The only thing to remember is that if you charge liquid you will get the job done faster and it will be easier to charge that way. Thank you for the question I hope it helped. And I'm glad you watch the video!
Thank you from the UK
Thank you and thank you for letting me know where you are watching from!!!! I am in Virginia just outside Washington DC.
Solid video, Julio !
Thank you! I'm glad you liked it! And thank you for watching!
Thank you for making this video. God bless you.
How would charge the system… sameway when the compressor is empty.?
Please help!!!!!
If unit is normal running or full charge already how much PSIG in blue and how much pressure in hiside for 410
I would assume that you were talking about a regular air conditioning unit, if that is the case and the room temperature seems to be around 75°F, then your suction pressure should be right around 118 to 120 PSIG on the low side. If the room temperature is warmer then of course you're such a pressure will be higher. Or in other words the pressure on the blue gauge which is the low side. On the high side it will depend on the outside temperature. If the outside temperature is around 90 or 95°F then your high side pressure could be between 115 to 120 psi. If it is cooler outside then the high side pressure of course will be lower than that. I think this is what you were asking thank you for sending your question in.
Thanks Julio! I added 2.5oz R410A, upright, as a gas, to my new Pioneer 12k Mini-Split Did I do harm???
Not if it was only 2.5 ounces. Remember all of these new refrigerators are blends so they must be added as a liquid throttled in to the low side. Good luck out there!
@R L if you are throttling the liquid into the system with your gauges it will be a perfect blend. It's only when you charge it as a guess that you do not have a perfect blend. I hope this makes sense.
best video for dummys like me great thanks
I like making things simple so I can understand them!!! my students in the classroom seem to like how I explain things!!! Thank you!!!! glad you liked the video!!!
Thank you for the video. What would happen if we keep the bottle in a normal position and charge the system with vapour? Will it not be safer to charge the system with vapour rather than turning the bottle upside down and charging it with liquid?
Yes it would be safer BUT!!! with the new refrigerants, because they are blends the refrigerant will not go go in to the systems with the correct proportions and the unit will not operate properly. This is why we need to charge with liquid and throttle the refrigerant in to the system. I hope this answers your question.
@@AirConAcademy Thanks a lot.
Appreciate your effort to educate us. I need your help on charging a bare tube evaporator for freezer with txv, liquid receiver. Whenever I charge the system with vapour, the performance is more superb than when I charge with liquid. The freezing is usually thick on the tube with liquid charging and this delays the baking time while vapour charging is usually very light and baking time is more quicker. R22 is used. Again, I want to try 404 by charging with liquid through king valve to weigh in refrigerant but I want to know whether it will amount to the same result. Thanks
Hi: thank you for your comment! I keep hoping that my videos educate and help you guys out there in the field! I have not seen a bare tube evaporator in a very, very long time! Now as for your unit! Since it is R22 it should not make a difference if is charged with liquid or vapor. Since your system has a TXV and a receiver then it should be charged by sub cooling! If possible I would not switch to 404 refrigerant. As long as your system is tight and you are not leaking refrigerant you should be able to stay with R22. If you feel you must convert to 404 then, yes you would charge the 404 refrigerant through the liquid line once the system is completely empty and you have evacuated the system to 500 µm. You will need to complete the charge through the suction line and it must be added as a liquid but you must throttle the gauges as you add refrigerant so you do not get liquid back to the compressor! Don't forget to change the dryers if you do switch over! The amount of charge should be almost the same if you switch to the 404 refrigerant. You will have to check the superheat to make sure that that is correct and you do not flood the compressor! I hope it turns out well! If you have any questions, let me know! And sorry it took me so long to get back to you,!
@@AirConAcademyI appreciate your time to write this long explanation. Thank you very much
@@wasiuadewale9781 you're welcome, I just want to make sure that I can help you guys out there in the field! Take care and God bless!
Hello Sir, Tnx for the video, here is a question, in min 1:26 are you sure that you are mentioning the high side and low side currently ?
Kamran Man Yes, I am on a train to high side and the low side. And when adding refrigerant you can only add refrigerant to the low side.
@@AirConAcademy you are right sir but what you are showing on video is different ! The pipe with higher diameter and access is low side of our system and is our suction line ;)
@@kamranman8369 yes, I placed the arrow there because it is insulated. I should have come up with a better picture.
I would really like to see a training course on pls programing for beginners, If you could" I would really appreciate your input on that thank you sir!! And also are there any classes available in Chicago IL Am with Local 399 Operating Engineers can you give me the site on where to go? Or do you have on line courses available, thxs a lot for all that you do for us guys and lady's ....
Thank you for your suggestion. I have had several people ask about that. I will see what I can do!
Nice video good information about liquid charging what is the gage reading for charging 404 on the low side because there is no port on the high side but just in case there is a low and high what is the reading on the gage thanks bro
That is a tough question to answer. It depends on the type of system that you are using, it also depends on the type of metering device that you have, and most importantly what is the temperature of the evaporator supposed to be.
For example if your evaporator is supposed to be at 30°F your pressure should be right around 69PSIG, if your evaporator is supposed to be around 20°F then your suction pressure should be around 35 psi, if your evaporator is supposed to be at 10°F then your suction pressure should be right around 43 psi, but you still should get a superheat reading and if this is a package unit then the unit should be charged by weight according to the data plate to make sure that it is correct. But to charge it by weight you need to recover the refrigerant pull a vacuum and charge the system. That is a lot of work. I hope this helps. And thank you for sending your message.!
Wow thanks bro you are the first person since I asking questions on TH-cam helps me I am a small ac technician but I get some time big collar to work on but I don't have all of those tools like the recovery and the digital gage for checking the super heat on the collar plate don't have that information it have the voltage amps type of gas very old system but I need the job I try to change the system on amps the compressor is 15 amps thank you very much for your help looking forward for more god bless
@@wasimedoo1506 thank you so much for your comments. I do like to help the guys that are starting out. I have been doing this for 42 years and I'm slowly stepping out. But I would like to help the guys that are starting out. You do need some of the equipment. But others it's just luxury. You do need a recovery machine if you want to recover refrigerant and do most of these replacements. You don't really need the digital gauges they're just nice and fancy to have. But you must have a set of gauges and if you have an electric meter that will read voltage, amperage, resistance, capacitance, continuity, and temperature you can do just about everything. You should be able to buy one of those for about $100. The temperature probes you could get one for around $50! Unfortunately you will need a torch also and some basic hand tools. I'm not sure exactly what you have but like I tell all of my new students in class only buy what you can afford and only do what you know you can do. You have to take chances at times and do something a little more complicated than you have in the past. But I'm hoping to get new videos here on TH-cam soon so keep learning and if you have questions send them over my way and I will see what I can do about helping.
I really appreciate what you doing for me and others thanks God will bless you for sharing your knowledge I am doing ac in a small scale I have a gage tools not every thing but some to do my work but the Meter for temperature I don't have I have a regular meter to do my troubleshooting to get that it's hard and that is what makes work have not haveing the tools I am from Guyana thanks bro
@@wasimedoo1506 OHHHH I had no idea you were in Guyana. But like I tell all of the guys in class, take your time save your money and little by little you will get the tools that you need. Do not give up and the good Lord will help you. Good luck and Keep learning.
Thanks for this tutorial. You explained it very well and easy to understand. Are you familiar with the Imperial Kwik Charge low side adapter? If so, what's your opinion on it?
Years ago I bought one similar to that. And I have used it they work fine. Because of how long I've been doing this I can do just as good of a job without it. These tools are great and they help you but if I don't really need it I do not buy it. But it is a good tool end it will keep you from slugging the compressor.
Hi, if adding r410a only results in an increase in subcooling but the low side saturation temp remains around 20F. Could this be a bad txv causing a restriction and freezing up? Really enjoying all your videos. Thanks
It sounds like you may have an airflow problem. I have seen that happen, when the system has low airflow. Remember a TXV is going to maintain superheat, not the evaporator temperature. Evaporator temperature is maintained by the correct airflow. So if your evaporator saturation temperature remains around 20°F you can check the superheat. you probably find out that you still have approximately 10° of superheat even though the temperature has dropped. That means you're TXV is doing its job. But check the airflow, make sure the evaporator coil is clean, make sure vents are open and your filter is clean. good luck!!!
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
@@mark.r8900 Yes!!! the saturation temperature is too low at 33F. it need to be around 40F. are you saying that the high side saturation temperature is 97F and you do not have any subcooling? A system using a TXV is suppose to have subcooling if you have no subcooling you need to add refrigerant. The TXV is suppose to maintain suerheat and you have high superheat it also implies hat you are low on refrigerant. I hope this helps you!!!
Thank you
Can you please make videos on burn out.
Both Electrical and Mechanical burn outs.
Burn outs inside the RAC system.
Thank you!!! yes I will very good idea!!!
Very good explaining
Thank you!!! I am glad you liked it!!!
Good Morning Sir, thank you for all the valued informations, me and my colleges would like to see and hear from you the Signs and scenarios of an Air Conditioner Evaporator having a high return air temperature.
Hi thank you for your very informative video. I will just ask, why we can't just charge direct vapor refrigerant then into suction line?...
Jimbel Calicdan thank you for your question, that was a very good question I should have added that to the video. 410 A and most other refrigerants now are what they call blends. That means that they are made up of two or three different types of refrigerant. Because of this each refrigerant will will boil at different temperatures.. So when you add refrigerant you will be adding more of one refrigerant that makes up the blend into the system instead of the proper percentages like they were supposed to be going into the system. R 22 and R 12 for example are one single refrigerant they are not blends so you could add them to the system as a gas. I hope this helps if you still have a question please let me know. Thank you!
Cool tutorial but I have a question, I attended a training where I was told the best practice to charge a domestic split system unit is via the high side.
Please can you shed more light on that, if it's practicable
It is not a short explanation. Basically there are three ways to charge a system. The easiest is by weight. But you can only do that when the system is completely empty and under a vacuum and you know the exact amount of refrigerant the unit cost for like in a package unit. Then there is charging by superheat. You charge by superheat when you have a capillary tube or a piston as a metering device. When you have a TXV or an EEV in other words electronic expansion valve, some people say EXV but it is still an electronic expansion valve is charged by sub cooling because both of those will adjust to maintain proper superheat. So you want to make sure that you have enough sub cool liquid going to the metering device. Remember, only three ways to charger system, superheat, sub cooling and by weight. I hope this answers your question!
Thanks soo much sir. Please do u ve any book on refrigeration.
Not at the moment. Unfortunately I still have to work so I have a lot of stuff going on. I hope one day to be able to just do this full-time! Thank you for watching!
Nice one Julio
You are very welcome! And thank you for watching!
I like to see some practical from you sir
That is the one thing that I have found difficult to do online. To do the practical material. It is so much easier in the classroom when I can show the students and watch them do it.
Great job Julio and thank you so much, I've learned a lot here with you. i have a question for you, whats the correct super heat and sup cooling on a refrigeration system???
marcos romero Thank you so much for your comments! That only expires me to do more for you guys. If you are talking a large refrigeration system and it has a TXV, I always suggest 8 to 10° of superheat. But like I tell everyone in my classes who does best? Me or the manufacturer? The manufacture knows exactly what kind of superheat they want so it would be best to contact them. But regardless we do want some superheat at the end of the evaporator to make sure we do not flood the compressor. Again, thank you for your comments!
@@AirConAcademy Thank you sir.
Do something on reefer containers more specifically the controls
ohh good idea Thank you!!! will see what I can do!!!
@@AirConAcademy greatly appreciated
Thanks very much for this info ! I've been looking for a video on this.
Thank you!!! I am glad I could help!!!
Awesome video!!
Thank you!!!! I am glad you liked the video and thank you for watching!!!!
Hello sir thanks for very good lectures..
maybe you could help me understand whats going on with our A/C compressor last time..our compressor damaged twice with some Piston and connecting rod broken inside..it's a 6 cylinder R404A..they said due to liquid coming back to compressor is the reason..what do u think is the reason liquid coming back and mixing in the oil..and how it goes inside the crankcase??we could see from the compressor sight glass white bubbles Everytime then oil disappear..so many time we change oil and cleaned oil separator as well.. why oil always coming out and sometimes never go back...but finally we changed the txv and looks like no more liquid coming back..but I'm not sure how long it will run..I hope you can give me a good advise about this matter ..many thanks in advance..
Yes, liquid coming back to the compressor will ruin a compressor. It is called floodback. Keep an eye on the superheat, there needs to be superheat, keep checking the superheat. The TXV can be adjusted so you may have to adjust it. Changing the oil will not do anything for that problem. I made a video and I should post it next week. I hope the video explains it better. If you have other questions PLEASE let me know!!! I hope this helped.
I just finished the video and it should post in about 10 hours!!! Hope it helps!!!
Wildan Saliste the bubbles that you see on the compressor sight glass is due to the líquid refrigerant mixed with the oil on the crankcase, but this only happens when the compressor starts, and this issue is because the crankcase becomes the coldest place of the system when the system is not running, that's why the crankcase have a heater to evaporate the líquid, and if the oil goes to the system and dont return, you may have a bad pipes instalation
@@martingates5952 yes very true the bubbles in the compressor are because of liquid refrigerant mixing in with the oil in the compressor. if it keeps happening then the metering device or TXV is feeding too much refrigerant to the evaporator and the evaporator is flooded. if it onl bubble up during starup then the crankcase heater is bad and you have flooded starts.
Great video thanks
Thank you for watching!!!!
Good day Sir may I ask when you charging liquid refrigerant in sunction line the unit must be turn off or in running condition? Thank you sir hope you notice my comment
Thank you! I tried to look and read all of the comments! And answer the comments. If you are putting liquid in the suction line, the unit must be running. Also, you must throttle or another words restrict the flow of liquid into the system. This is why I was explaining about adjusting the flow and only allowing a little bit of pressure in at a time. If you let too much liquid in, you will destroy the compressor. So please be careful when you add liquid through the liquid line. If you. Add liquid when the unit is off that is going to destroy your compressor, so please do not do that! Thank you for your question and thank you for watching!
How can I get Nate certification form india
I myself do not do night certifications. But take a look at this webpage. This may be able to help you.
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hi
how are you man
now
what is the right way to add the gas
liquid or vapor?
Not an Easy answer!!! If it is R410a it has to be liquid!!! if it is R22 YOU CAN!!! add either liquid or vapor, Gas is safer but liquid is faster! Either way when you add liquid, meaning 410a or 22 you need to be careful when you put liquid in there because you could kill your compressor! this is the easiest way to answer your question. I hope it helped.
@@AirConAcademy thank you so much
i wish for you evvvery thing good
@@mohammadbinali6490 Thank you!!!!
You have any videos on leak and the leak detection
I Have not posted it yet. I have some videos that show leaks but I need to prepare an actual video to put it online. I'm sorry I do not at this time.
I think there are some adapters nowadays, which are designed for this problem. Liquid charge adapters.
Yes, you are absolutely correct! They are adapters. There are several things that you can buy. Unfortunately, a lot of the people that I meet they are beginning to work in the trade and they don't have the money. Because of that I try to go over things that might help them get started until they can afford to buy some of these tools. But you are absolutely correct. Yes, there are several other things you can buy. Thank you for your comment and thank you for watching.
@@AirConAcademy Your videos are amazing, they have been a great help for someone like me. I would personally love to see you make a video on oil seperators, oil traps and identify/troubleshoot an oil clogged evaporator. Keep them coming!
Thank you! When some of you make suggestions, I write them down so that I can hopefully get to making those videos soon enough! Thank you for watching! @@Nightmare52199
Is it propper to charge liquid refrigerant to air-conditioning system ?
Yes, it is OK as long as you know what you're doing? Or as long as you follow the directions I'm giving you in this video. The refrigerants these days are blends, which means that they are a combination of two or three different types of refrigerant. Because of that as a liquid they are in the proper percentages. When you add them to a system in the vapor form the percentages are way off so the unit will not run properly. To add liquid you could follow the directions that I am giving you in the video or you can buy a tool that will help you charge the system. All that the tool will do is to flash off the refrigerant as it goes through the tool. I have seen some of these tools called charge faster. In class I teach the students like I did in the video so they do not have to spend money on tools at first. As you are in this field longer you will have more money and you can buy more tools. At least that is how I see it because I have been in those shoes where money is tight! I hope this answers your question, thank you for watching and thank you for your question.!
@@AirConAcademy Thanks for your quick response, which country are you from ? Am from Ghana but currently working in Qatar
@@samuelbamfoadjei1105 I am in the United States USA. I live in the state of Virginia, right outside of Washington DC. I was born in Guatemala and came here when I was a little kid. Please keep learning and asking questions!!! Thank you!!!
Just a question; isn't the suction line (gas) larger pipe and high side liquid smaller pipe?
Yes, you are correct. When I made this video. I'm sorry to say I used that picture and I hoped you guys would not notice but some of you have. That was one of my first videos and I have learned that a lot of you out there are sharp and pick up on small things, or in this case big things. Thank you for your comment and you are correct and I'm sorry that that picture looks like that. I guess I should try to change it.
Wow I love you’re amazing tutorials how do I take class online
you can go to my webpage and look at the classes I have!!! Thank you!!1
airconacademy.com/collections/hvac/
airconacademy.com/collections/hvac/
look on this link above.
This is done with the units running and set to cool, correct?
Yes! You are correct he would do this while the unit is running and set a cooling especially if it is a heat pump. If it is a heat pump it must be set to cooling. If the unit is off and under a vacuum you can just charge liquid into the liquid line without falling it. Mainly because liquid should be in the liquid line. Thank you for your question!
@@AirConAcademy Thanks for your help and great video.
I received an 11 pound R410a canister yesterday and added it until I was around 115-120 psi and my Mr Cool 18k system with 16 feet of line came back to life.
When the system is turned off, the pressure rises way up.
It returns down to 115-120 psi when I turn it back on.
I guess that is normal?
I also ordered a Freon leak detector just now. I may have a small leak, but I can't find it with soapy water.
@@EL34XYZ 115/120 psi is normal that gives you about a 40° evaporator. The pressure on the high side should have been between 375 and 400 pounds of pressure, so when you shut it off yes the pressures will equalize that 115 or 120 will come up very high but on start up it will drop back down. That is one of the drawbacks about 410 A the pressures are very high. But I'm glad that you got it running!
@@EL34XYZ sometimes those leaks are hard to find. Make sure that you have caps where you connected your gauges because sometimes that is where the leak is. If you get new caps and that is where the leak is the seal and the new Will stop the leak.
Great video, 410A at 119PSI= 33F how does it give you 40F coil ? If you can put your input on this and also does this apply to walk in C/F coil temps ? Where they should be at ????
XRAY Bravo I think you might want to check your readings or your PT Chart again. The PT Chart I am looking at says 118 psi G gives you 39.5. And yes, it applies to walk in.
XRAY Bravo On a walk in. The evaporator should be around 35°. And at 35° R410a is 108 psi
@@AirConAcademy Thank you sir for replying, I got my readings from danfos slider app but when I looked at different PT chart 118P = 40 F coil.
Thank you.
XRAY Bravo You’re welcome, anytime!
I did try to use the high side once and it did not take. A few months later, an installer was trying also and I pointed it out to him.
In order for it to go in on the high side the system has to be turned off and at the same time it needs to be in a vacuum, this way the refrigerant will go into the liquid line without a problem.
To add refrigerant on the high side the system must be off and it needs to be in a vacuum so refrigerant will flow right into the liquid line/high-pressure side. If the unit is running or partially charged it will not work.
When charging in liquid form, using a liquid to vapor converter , should you still crack the low side every 30 seconds or just open the valve fully?
According to the manufacture you can just open it fully. I like to be in control so I usually do not use those and even if I did I would throttle it at the low side valve just to make sure. We never know when things will fail! Thank you for watching and your comment!
@@AirConAcademy thanks man
Hello, would you still add to the suction line if the unit is off and in a vacuum?
Thank you for your question, it would be best not to add it to the suction line because if you do, liquid will get to the compressor, mix in with the oil and on start up the liquid refrigerant could lock up the compressor because of the lack of lubrication in the bearings. If that does not happen, then the oil would foam up and be pumped out of the compressor and your bearings would lock up because of lack of lubrication. So it is not suggesting that you add liquid refrigerant in to the suction side when your are first charging a system. I hope this answers your question!!!
Hi, I've just replaced an evaporator coil. The system is pretty low on r410a. Both, the liquid line and suction line service valves are closed. Can I add some liquid r410a into the high side first before starting the system up? Thanks
yes, you can add liquid to the liquid line only. I have done this many of times, when I have done it I have my suction and liquid line service valves open. I add liquid to the liquid line and keep adding 100% liquid until both pressures equalize. I usually keep the liquid line/red valve on my gauges open all the way to get as much liquid in there as possible. If you grab the red hose that has liquid going through it you can feel that liquid going through and you can actually feel it practically stop going into the unit. I have never overcharged a system doing it this way. Good luck sorry I just saw this. I hope this still helps.
Great video, Thank You.
Thank you!!!
Sorry but I dont understand one thing, U said that I should connect blue with suction side and charge it with liquid that will change state to gas but why I should connect red hose to disharge side.
I always tell everyone to always check both sides, the low side, and the high side. There are times when we need to add refrigerant according to the superheat and other times when we add refrigerant according to the sub cooling. That is the main reason we need to check both sides, the high and the low side. I hope this answers your question. Thank you for watching!
Blue goes to Vacuum- low side. Blue subcooling- red- superheat.
Instead of cranking it could we use the imperial kiwi charge on the suction line.
Yes you can. they work great!!! There are several tools you can use, they just cost you money. I try to keep the new guys from spending money so they can save money and buy tools as they go along.
What's the full charge pressure of r404a in commercial cold storage plant?
Nice nice. Better if you show this in a video practisch?
Thank you for your comment!!! and I believe you mean practice? I have to look for the videos where I am actually doing it. I hope I can add it on to this or make a new one. Thank you
@@AirConAcademy thank you 😀yes practice
Dear, I have a question. If we have 20TNR Compressor and refrigerant is 407A. What'll be the quantity if the refrigerant needs to refill after vacuuming the system?
Teacher, I want to ask you a question, what if someone has charged an empty system with gas form of refrigerant, any solution to this ? (asking a damage control)
That really depends on the type of refrigerant that they used. If they used R 22 then that is not a problem. If they used R 410 A then it could possibly be a problem and if they used R407C it is definitely a problem. 22 is a single component because of that it is perfectly OK to charge as a gas. 410 A is a blend and because of that you may not get the correct mixture in there. 407C is another blend which will not act correctly at all when charged as a vapor. So typically the new refrigerant must be charged as a liquid. If there is already refrigerant that was charged as a gas it should be recovered and fresh refrigerant, or new refrigerant should be put into the system throttled as a liquid form. I hope this answers your question. Thank you!
Symbols how to read symbols can you help
Can you change from using R22a in your Home AC unit to R410a without making any modifications to your Unit?
To make things short NO. the pressures in 410a is much higher then R22. The evaporator and the condenser in the r22 cannot handle the higher pressures of R410a. If yo add the 410a you may create a leak, blow a hole in either coil. r22 suction is around 68 in 410a it is around 118. the high side pressure can be, depending on outside air temperature, 260 and in 410a it could run 420. plus the oil in r22 will not mix well with 410a. I hope this make sense.
👍👍👍
Thank you! I'm glad you liked the video!
I wanna know how to get the exact charge in a refrigeration system.
That's a tough question, it's not that easy. You first need to know what type of metering device you have at the evaporator. Then depending on the metering device, you need to charge it to the proper superheat or sub pool. The manufacture will usually tell you in the charging chart that is in the panel. So if you have a TXV, you charge it by subcooling if you have a piston or a captube then you charge by superheat. I hope this answers your question. And thank you for watching!
Just use low side pressure to determine charging? is 30 sec too long and would be 2-3 second?
I use 2 or 3 sometimes. other times 5 seconds to 10 seconds it depends on the unit. Thank you.
charge on the low side, that depends, some heat pumps need to be off, and they dont want liquid on the low side its can destroy compressor that its not running. my pump water heating pump you charge on the high side with vaccum, its off of course. Must be off. between compressor and evaporator. If you must add as liquid in the suction (low side) the compressor must be on! And very carefully charge.
Yes it must be running to add it on the low side, BUT it must be throttled so you do not kill the compressor with liquid refrigerant getting to the compressor. I do it like that all of the time even in the winter time and never had had a problem. even in the winter time!! thank you for your comment.
V nice👍👍
thank you!!!
A class about services valve. And how do backseat, frontseat and cracked work?
Thanks in advance.
Thank you I will try to do these. Please make sure you subscribe to my channel.
th-cam.com/video/bMiw3RYzX_Y/w-d-xo.html
thanks julio
i am glad you liked the video. I am glad I can do these for you guys!!!
good video
Thank you!, Again! I'm glad you like the videos!
Why do we charge a system through the Vapor line?
One reason that units are charged through the vapor line it's because pressure goes from high to low. The pressure in the bottle is going to be much lower than the pressure in the liquid line. If you try adding refrigerant to the liquid line it will go from the liquid line into the bottle, not from the bottle to the unit. If the system is completely empty and under a vacuum you can put liquid into the liquid line and they will not harm anything. If the system is completely empty and under a vacuum and you add refrigerant to the suction line liquid will go into the compressor mix with the oil and dilute the oil so that it will not lubricate and on start up the compressor will lock up. If you tried to put liquid refrigerant into the suction line while the system is running and not throttle the liquid refrigerant you will get liquid back to the compressor and wipe the bearings and the compressor will lock up. I hope this explains it. Thank you for watching!
So if you have a system vacuumed down how would you fill unit with a blend ( which needs to go in as a liquid),if you dont fill in on suction line before start up?
410 i normally do 119 mostly 120 psi
What is the correct way when charging an r32 refrigerant when the ac is running..?
R32 refrigerant it's part of what makes up R410 a. R32 is not a blend so you should be able to add it to a system as a vapor. While the unit is running you will need to add this refrigerant or any refrigerant through the suction side. By adding the refrigerant as a liquid and throttling the gauge manifold set as I explained in the video you will be able to charge a system much, much faster than with gas. I hope this answers your question. And thank you for watching!
@@AirConAcademy thank you sir. 👍
Thans❤❤❤❤❤
I am glad you liked the video. And thank you for watching!
Thanks teacher
i have a question i a system with r12 refrigerant. can I recharge it with R22 without to change the oil and why?
In older units manufacturers used the same oil for R12 and R22. BUT there may be some issues. For one thing the pressures will be very different! so the Metering device will not work properly. then the size of the piping? I am not sure if the size of the pipe will affect it? I am assuming you are talking about an AC unit? or a refrigerator? because if it is a refrigerator the pressure will need to be very low to have a low temperature. what type of unit is it? AC or refrigeration?
@@AirConAcademy refrigeration freezing temperature
@@bnballakita Being a freezer can be a problem because the compressor will need to bring the evaporator temperature down to the same as the R12. You will need to change the Metering device, I guess it is using a TXV? make sure you keep an eye on the superheat. If you are going to switch to R22. make sure you have the mineral based oil not any of the synthetic oil. and you should have , If I remember correctly the 300 or higher oil number. let me know what you will do?
@@bnballakita A compressor that was designed to run only with R-12 CAN NOT use or run with R-22 because It will burn the motor coil if the compressor is hermetic or semihermetic (copelametic) and will brake the valves plate and everything inside it, the amperage will increase inmediatly triping out the breaker or the thermomagnetic, dont try to do it. The oil is the same for both but the metering device and the condenser coil aren't equal. If you think that using R-22 instead R-12 will decrease the temperature of the frezeer your're wrong, I've seen frezeers at -22 fahrenheit running with R-12
@@martingates5952 unfortunately I did it without to change the oil the coil has burned, but I replaced the compressor without to change metering device and the condenser, so it's still working so I think the issue is in the oil or what do you think? ???
R22 i remember it..and r12
I thought you dont want liquid to the suction line since you dont want liquid into the compressor?
You are correct yo do not want liquid in the compressor. You must throttle the refrigerant in to the suction line so it flashes off as it goes in to the suction line. You must be very careful NOT to put too much liquid in to the suction line as you are charging liquid. That is what I am trying to xplaining in the video, how to throttle it in to the system. Let me know if this made sense. Thank you!!!
@@AirConAcademy it make sense thank you!
@@AirConAcademy another question. Why dont you just add refrigerant (liquid) to the liquid line? Instead of the suction line.
@@labombao7725 AHHH Because when the unit is running the pressure in the liquid line will be much higher then the pressure in the bottle. So pressure will go from high to low and refrigerant will try to go from the unit to the bottle. the only time you can add refrigerant in the liquid line is when the unit is under a vacuum and the refrigerant will flow from the bottle and in to the unit.
@@AirConAcademy ahh thank you!!!
Not gonna lie had to charge a unit with 407c and when I looked at the pressure chart I was looking at the temp as ambient air temp and not the coil temp. Trying to get my coil to 94 degree ambient sitting there brain dead at the pressures like how the fk am I gonna get it that high. Not related to the video please tell me I’m not the only one to derp that up
Dirzek Ha ha, don’t feel bad! Out in the heat working all day I have done some crazy things too! Like I tell everyone in class. At some point we all have made mistakes and we will keep making them. I remember being up on the roof and hooking up my red hose/high side to the low side and the low side to the high side and wondering what is going on with my pressures! So Just take your time and you will be fine. Keep up the good work!
Thanks sir. Today I try charging the car ac usieng only vapor. When I reached to 35 - 40 psi, the motor locked up and I saw a steam-like smoke coming out of the compressor. Please help me, what did I do wrong or fail to do Sir? So dishearten.
OHHHHH that does not sound good!!! It is difficult to say because the way you described it it sounds like you did everything correct. The only thing I can possibly think of is that it is the wrong refrigerant but in a car that is very difficult to do because all of the cars use 134A. It could have been that the compressor was old? And when you say that you saw steam like smoke coming out of the compressor, it could have been coming from the belt trying to drive the compressor and the compressor locked up, so it could have been the belt that was rubbing up against the pulley. I assume that you saw that the compressor locked up, if that's what happened then the smoke came from the belt. It does not sound like you did anything wrong it could have been just it happened as you were adding refrigerant. Do not blame yourself. These things happen and I think it was just a coincidence it locking up like it did when it did. I am sorry this happened.
Thanks, I guess I will need to be more carefully next time sir.
I opened the motor and discovered that the clutch was free but the pulley got stuck to the coil Sir. Do you think I need to replace both the pulley and the coil?
Moses Tengbeh If it is just the coil that is stuck that’s a good thing. You may not need to replace the entire compressor. But make sure that the compressor is not locked up. When the coil energizes the clutch pulls in and the compressor starts to rotate. Before you replace the coil and the clutch make sure that the compressor rotates. If you are going to change the coil you should also change the clutch it would be a good idea.
your manifold gauges are reversed, do you really do HVAC work or just talk/teaching?
HA HA HA I do work on AC equipment. I have been doing it since 1979. I have been to lots of schools, have a lot of certifications. I have worked on a lot of different types of equipment, commercial, seagoing, industrial and residential. I have been teaching for over 30 years and have been retired for over 6 years. BUT never mind my experience. I believe you are talking about the picture on the unit. I used the blue for the low side because it has of the insulation.. That is what most people look for. You noticed the size of the lines which is very good!!! I have only had 2 other people comments on that. I guess I should have used a different picture. Very good for noticing that!!!!! Sharp!!!