Desperately need an answer. I am going crazy. ASSUMING a system is working properly can you determine the correct charge level with the sub cooling? In other words if you know the temp of the high line and the pressure of the high line can you determine if a system is properly charged assuming the outside temperature is reasonable. I know most systems only post the average temp. but.
i know Im asking the wrong place but does any of you know a way to get back into an Instagram account? I somehow lost the password. I appreciate any help you can give me!
@Forest Ismael thanks so much for your reply. I found the site thru google and I'm waiting for the hacking stuff atm. I see it takes a while so I will reply here later when my account password hopefully is recovered.
These guys aren't lying. Spent 2 yrs of night classes and didn't learn this. You were born to teach and share/pass on knowledge to others. Thank you for taking the time to do it.
This video is 14 mins long but I took 2 hours to finish it. Not ashamed to say that I’m taking it in word for word. You’re a good man thank you for the video.
I went to trade school, and have been in the field for six months, but I never fully understood Superheat or Subcooling. This video finally explained it in a way I understand. Thank you for making it.
I was able to have auto problems with a/c. It has the same parts. A few difference, big or small unites, txv is diffferent looking. . Concept the same,
Any experienced service techs will tell you that you guys who are all starting are all in the right field! I started 19 years ago and did install for my first 12 years and then slowly converted to maintenance and being the piping , wiring, drains and flu pipe guy. Kind of a hybrid but now for the last 4 years I've been strictly service and let me tell you the money you can make it's unbelievable especially if you are doing a lot of work for your self. My personal opinion is work for a good company and do some side work but NEVER break the golden rule and steal customers. Start your side work between friends , family and acquaintances and build off that. You'll usually make on a Saturday what you made all week just one one service call and if your doing any type of coil or condenser change out or whole unit swap out you'll make double for the day what you make in a week and that's even if your giving people great prices! lol HVAC life is great though I love it!!
@@acservicetechchannel just put my order in on Amazon and binge watching your content in preparation for starting a new HVAC job this month. Thank you!
how’s that going im studying right now my grandfather and dad, both Do air-conditioning down here in Sarasota Florida. One of my grandfathers clients is stephen king out on bird key
@@Rangobine I learned this book inside and out as fast as I could. I also learned his mini split book, manual D, and a bunch of others. Working as a selling technician for one of the top companies in my city making about $9-$10k a month.
I came across your channel 7 days ago im 21 years old wanted to get into the hvac field I’m going to start classes soon but I also watch your videos they super understanding of how u lay your teaching format word by word step by step I definitely will be ordering the book need to soak up as much advice and knowledge possible
Went in for an interview for a tech position years ago and the guy walked in and said "I just have one question: What method do you charge a unit?" I said, depends on your metering device, subcooling or superheat. He said, you're hired. Then he walked out of the room.
Was it for an apprentice job? I have an interview for a union for a 1st year apprentice and I’m watching this video I don’t know if they will ask me stuff like that but your comment makes me feel like it’s a good thing I am.
@@johnmattern6068 no I had already been a service tech for a few years so I knew just enough to be dangerous haha. They may ask you a question like that as well as other questions. If you don't know the answer, just say so. If you talk the talk, they will find out pretty quick if you can actually walk the walk. Good luck!
@@dgapp76 well said sir, to @John Mattern, remember this, you’re going in for an apprentice job. Trust me, they don’t expect you to know a whole lot. What you want to do is just like this dude said, be honest. I can tell you from experience, a good work ethic is worth TEN TIMESall the knowledge in the world. If you have a good work ethic, I can teach you anything you want to know about this industry. But without a good work ethic, and all the knowledge in the world, you’re just a lazy bum, nothing more. Good luck to ya buddy, I’m sure you’ll do well… or should I say, I’m sure you did well. One thing I LOVE about these unions, they’re not satisfied with making you a limited journeyman. When they get done with you, you’ll be a master of this trade. Congratulations, make the most of it…
Out of all the channels/videos on UA-cam regarding HVAC walkthroughs, yours is by FAR the absolute best. I really appreciate what you're doing here with this channel and am happy to see there's ads. Thank you for the amazing content and wisdom.
I’m an auto tech, when we had HVAC out at our house one time I was talking to the tech about the HVAC I deal with and he said it’s similar but completely different. I can see he was 100% right.
I am an electrician and, this was a damn good video. I now kinda understand refrigerant. I bet if I watched it again id understand even more. Lots of terminology, which i want. Because that is how the hvac world speaks. Love it.
I have scoured all of UA-cam just to find out what you demonstrated here. Most educational videos assume that you know what saturation and subcooling and superheating are and go at a quite fast pace from one topic to another. If I buy anything, it's going to be from you. Thank you for taking the time and not assuming that people know things that they don't. Great work here!
This was, by far, the least convoluted explanation I've gotten on this subject. I can finally understand the concept after way too long overthinking it and getting nowhere when someone else tries to explain it. Thanks a ton! I came here hoping for a little clarification and found a whole new way of thinking about it. The simple, yet in depth explanation was perfect!
This is a confidence builder. Listen apprentice don’t rely on your journeymen to teach you this. Ive purchased the book, it is awesome plus watched his videos. The best teacher Period. Thank you for posting.
Wow Craig that's the best definition of "saturated" that I've ever heard! Previous explanations just explanations just told me it was a mixture of liquid and vapor. You clarified that at this point it is not changing temperature. but only changing phase. For 12 years since Tech school I have understood super heat and subcooling but "saturated" has been sort of vague. Thanks again for the excellent videos and I highly recommend your book and cards to anyone reading this!
thermodynamics requires a good explanation unless you are a genius. I was supposedly an A-student, but I still really didn't understand it well enough to remember it for very long.
As an engineer, but former tech, I enjoy watching such videos (usually the result of researching test equipment though). Overall, good explanation, just might have started with definitions of terms first (but that is just more preference in presentation). As mentioned in the video, or to make it more clear… The temperature of the refrigerant decreases during the desuperheating and sub-cooling processes, but remains constant during the condensing process itself (gas to liquid, or as in the video the “saturated section”). The energy rejected from the refrigerant heats the secondary medium (copper or aluminum), whose temperature thus increases. However, The refrigerant pressure changes little from desuperheating to subcooling (think compressor to service valve). In a similar way to evaporation, the only pressure difference between the entrance and the exit of the heat exchanger is just the pressure drop (the equation is: pressure equals temperature times volume - which explains why your car tire pressure only changes with heat, but is the same wether mounted or not). Also, because the flow velocity in a condenser decreases, the induced pressure drop is much lower than in an evaporator. In other words, the pressure is rather stable throughout the high-side and low-side environment (between condenser and the expansion valve / orifice and vise versa). Another key thing to remember, is that phase change is what takes the most energy (yet pressure is still rather constant). Thus, most heat is transferred during the condensing process (that process which is after desuperheating but before subcooling). Another mental tool I use to think of saturation is relating it to the opposite as in precipitation of say minerals from water; boiling water causes dissolved solids to precipitate (due to temperature change).
At minute 8:49 you mentioned if our target superheat was 9 degrees and super heat we got was 13 degrees, we are undercharged. Wanted clarification if that was a mistake. Since before that, you mentioned if our target was 13 and we got 17 then we would be overcharged. I appreciate this great video and your time.
Wow. I'm blown away. I finally after so many years understand subcooling and superheat. I don't know why but I've had a hard time understanding what they both meant...even after taking a refrigeration course 15 years ago! I got my universal 608 at that time but I'm not a technician. I just took the class to learn about refrigeration. I recently started watching videos again and tried to understand once again the difference between subcooling and superheat. And now I totally understand because of this video. Great explanation!
I have done HVAC 20 years as a lead maintenance for apartments and couldn't grasp the concept of superheat and subcooling until watching this video too!! I feel you bro.. It's like I leveled up in a video game..
I purchased both the hard-copy book and the e-book. Fantastic indeed. This video reminds me to re-read the book since warm weather is coming. If you don’t do this very often, you forget some things. The book is a perfect refresher. Thanks Craig, and keep up the great videos. I always look forward to watching them all!
The data plaque on condensing unit has written "TXV subcooling 15 deg F". Can't get to the evaporator. Is the plaque a dead give away as to it being a TXV ??? Thanks. Tom
Thats awesome to hear and if you want to see more visuals, check out the free articles on superheat and subcooling at www.acservicetech.com/articles thanks!
exactly the explanation i needed. An explanation looking at a diagram just doesn't click. Having the gauges and condenser there and instructing how it would be done in the field is much better.
Incredible speech! Short easy words to understand. Coherence in thinking and so easy to follow your mind and highly comprehensive comprehend!!! Thank you very much.
So great to hear that you valued the video, thanks! Make sure to read some of the articles on superheat and subcooling on our website at www.acservicetech.com thanks!
Future service technician in the making here. Thanks for the invite to like your page on Facebook. I find your videos useful and have learned from this video. I'm very much blessed and appreciate this video 🙏🏼
The subcooling method for checking refrigerant on a TXV system is recommended by HVAC industry standards and guidelines, such as those provided by the Air Conditioning, Heating, and Refrigeration Institute (AHRI) and HVAC training resources. This method ensures that the system has the correct charge since the TXV regulates superheat automatically.
Wow wow wow.... I am going to buy that book. I have watched tons of video to understand it, everyone talks about subcoolong yourcooling mycooling, put their face in front of the video and talk all day long all nonsense. Once in a while we find gems like this. The distance you mentioned about subcooling measurement made the biggest difference in understanding. It would be nice if you could create a video that explains the valves of the measuring unit, how to open, where to connect etc... would be good. I am not worried about my ac unit going bad because of my screw up during the learning process, my concern what if something explodes... hahahah. I hired someone to find the leak and he could not. A video on how to find leak would be good too. My ac is losing refrigerant very slowly, like in two years I have to refill. My unit is 6 years old.
Cant recommend this book enough. So simple to read and understand. Im not a tech so I dont service hvac systems enough to have this material become second nature. I read it last year, but forgot some stuff by this year. I decided to read the book again (something I would normally never do), and found it just as enjoyable as the first time i read it.
This was useful as I'm a bit rusty or perhaps rusted. I have other responsibilities that I deal with like plumbing and electrical and haven't recovered refrigerant in a long time.
So if it has a fixed orifice piston or capillary you measure the indoor wet bulb temperature and then the outside coil super heat for your total superheat and if it has a TXV then you just measure the tempeature off the liquid line coil and compare the red high side gauge for subcooling correct
I thoroughly understood everything you said here but I just ordered the book because I want to be able to teach it as well as you. Awesome video! Keep it up! Thank you!
Knowledge you gain more when you share your knowledge to everyone.thank you for sharing this wonderful knowledge to us..it's very useful for being a hvac technicians. ..
It may be worth mentioning that you can have an illusion of higher subcooling if you have restriction somewhere, say if the filter dryer was a problem right?
I know I am getting way , way off BASE here .... except you guys are my favorite HVAC SITE . AM I TO UNDERSTAND THAT IN A SYSTEM THAT IS NOT RUNNING , THE HIGH AND LOW PRESSURES EQUALIZE .... and I am referring to AUTOMOTIVE !!!! NO CRANK , NO START 2005 HONDA CRV I would like to part out ..... THE AC IS KILLER COLD , WHEN RUNNING !!!!!!!
Hey do you ever plan on doing a book on electrical wiring and troubleshooting or is that already in the book now and your videos are the best learning a lot thanks
The refrigerant charging book includes everything to prepare a system for refrigerant, refrigerant charging, troubleshooting while measuring the charge and airflow. The full outline is available at www.acservicetech.com/ac-book and I would like to get an electrical book together. It all takes a lot more time than anyone would ever think to make sure you get it done right. Thanks for letting me know what you would like to see!
I thought this was a great explanation of how to check the subcooled and superheated temperatures and explaining the process of both coils, compressor and expansion device. I did have one comment about what the saturated state means. A saturated liquid has a quality of 0% and a saturated vapor has a quality of 100% and the liquid-vapor state is everything in between. This is when the phase change is occurring and temperature is held constant.
I am really glad you appreciated the video! That kind of info was what I tried to put into the book, the procedures and the why and why not, step by step instructions. Thanks for your note!
You don't neccesarily need any sight glass for air conditioning systems. You would measure the subcooling because these types are systems differ from refrigeration units.
Great video.. one thing I'm wondering.. Is it possible to alway check for the proper charge by just measuring the subcooling, and not worrying about the superheating? If so, then one doesn't have to worry about weather its a fixed-orifice meter or a TVX, no? I suppose you could check subcool and superheat, and if one is correct and the other wrong, it could give an indication that the "wrong" side of the system wasn't operating properly. Maybe you could elaborate on why you need to check both, whether they are sometimes inconsistent with each other even after the system has stabilized, and what to suspect in each of two inoconsistent subcool/superheat scenarios. Of course, if they are both consistent with each other, then there is either too much or too little refrigerant, and some needs to be recovered or added, etc. I know I'm asking a lot here, but I suspect you maybe able to simplify my concern. Thanks
Basically what i understood is this type of measurment is like playing darts you want the cooling in the evap to happen dead on center that way its not loosing it blower point, by the coolness not being release between after the coil and the lowside port?? But because the evap coil and consensor(outside) are not the same size it has to be right on the dot that way when you hit (heatmode) the reversing valve and the freon in the condensor isnt past its points as well?
Man if I had lessons like this 27 years ago I would’ve been a tech way sooner in my life. I’m still not great. lol but I get by pretty good. Being a good tech is not easy.
@@acservicetechchannel Looking now. Interested in putting a split unit in my home. More familiar trouble shooting & installing boilers then AC units so I'm doing my home work using your channel. Extremely helpful. Any manufacture recommended units (3-4 zones) Thank you!
That's a lot of information. Useful practical. After seeing your theory video and now with this practical my life is complete. Q. Why do pump down videos show things going smoothly when I'd expect the compressor to stop working because closing the liquid line valve would make pressure sensor valve trigger or the vacuum created would trigger a too low pressure sensor cutting of compressor. Or do most have to bypass these sensors.
The low pressure sensor would be jumped out beforehand and on smaller systems there is no oil sensor. It is hard on the compressor though if there is no receiver, thanks!
I passed my E.P.A super proud , Now how do I go about getting a job in Hvac I haven't been hands on ? Any help would be gladly appreciated thanks ,And thanks for the great videos!
I've always thought, little red riding hood for the liquid line and big blue for the suction line. I've taught others that years ago and they tell me they use that all the time when explaining to others.
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Related Videos:
The Refrigeration Cycle Explained Step By Step! ua-cam.com/video/yjmrCEA1zIA/v-deo.html
Why Measure Both Superheat and Subcooling? ua-cam.com/video/ADVMXANhoz4/v-deo.html
Total Superheat Method! ua-cam.com/video/s9I1aVugdkY/v-deo.html
Superheat Charging Chart- How to Find Target Superheat! ua-cam.com/video/bIL9BrKCujc/v-deo.html
Connect, Measure, Disconnect Procedure! ua-cam.com/video/4oE3pkhJynQ/v-deo.html
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Very good and useful.
Desperately need an answer. I am going crazy. ASSUMING a system is working properly can you determine the correct charge level with the sub cooling? In other words if you know the temp of the high line and the pressure of the high line can you determine if a system is properly charged assuming the outside temperature is reasonable. I know most systems only post the average temp. but.
i know Im asking the wrong place but does any of you know a way to get back into an Instagram account?
I somehow lost the password. I appreciate any help you can give me!
@Gustavo Keegan Instablaster :)
@Forest Ismael thanks so much for your reply. I found the site thru google and I'm waiting for the hacking stuff atm.
I see it takes a while so I will reply here later when my account password hopefully is recovered.
These guys aren't lying. Spent 2 yrs of night classes and didn't learn this. You were born to teach and share/pass on knowledge to others. Thank you for taking the time to do it.
My entire first year class in 14 minutes. Your awesome.
That is awesome! Thank you for your support!!
lol
Did you at least get to hookup the gauges?
Wait...... It takes a year to learn this in school ??
@@WTF_BBQ4 years if I remember correctly
This video is 14 mins long but I took 2 hours to finish it. Not ashamed to say that I’m taking it in word for word. You’re a good man thank you for the video.
Wow, you really want to learn and thats great!!!
Yeah it can definitely get confusing it took me a couple years to figure out what it was and to actually have it stick in my brain 😂
I went to trade school, and have been in the field for six months, but I never fully understood Superheat or Subcooling. This video finally explained it in a way I understand. Thank you for making it.
I have to rewatch this at least 5 times to really understand what you're saying, but you do an excellent job. Thanks
I was able to have auto problems with a/c. It has the same parts. A few difference, big or small unites, txv is diffferent looking. . Concept the same,
Any experienced service techs will tell you that you guys who are all starting are all in the right field! I started 19 years ago and did install for my first 12 years and then slowly converted to maintenance and being the piping , wiring, drains and flu pipe guy. Kind of a hybrid but now for the last 4 years I've been strictly service and let me tell you the money you can make it's unbelievable especially if you are doing a lot of work for your self. My personal opinion is work for a good company and do some side work but NEVER break the golden rule and steal customers. Start your side work between friends , family and acquaintances and build off that. You'll usually make on a Saturday what you made all week just one one service call and if your doing any type of coil or condenser change out or whole unit swap out you'll make double for the day what you make in a week and that's even if your giving people great prices! lol HVAC life is great though I love it!!
This video alone is enough to convince me to spend $68 on the book. Well done.
Thats so encouraging, thanks!!!
@@acservicetechchannel just put my order in on Amazon and binge watching your content in preparation for starting a new HVAC job this month. Thank you!
how’s that going im studying right now my grandfather and dad, both Do air-conditioning down here in Sarasota Florida. One of my grandfathers clients is stephen king out on bird key
@@Rangobine I learned this book inside and out as fast as I could. I also learned his mini split book, manual D, and a bunch of others. Working as a selling technician for one of the top companies in my city making about $9-$10k a month.
I came across your channel 7 days ago im 21 years old wanted to get into the hvac field I’m going to start classes soon but I also watch your videos they super understanding of how u lay your teaching format word by word step by step I definitely will be ordering the book need to soak up as much advice and knowledge possible
That is so cool and encouraging to hear, thanks!!
Went in for an interview for a tech position years ago and the guy walked in and said "I just have one question: What method do you charge a unit?" I said, depends on your metering device, subcooling or superheat. He said, you're hired. Then he walked out of the room.
Was it for an apprentice job? I have an interview for a union for a 1st year apprentice and I’m watching this video I don’t know if they will ask me stuff like that but your comment makes me feel like it’s a good thing I am.
@@johnmattern6068 no I had already been a service tech for a few years so I knew just enough to be dangerous haha. They may ask you a question like that as well as other questions. If you don't know the answer, just say so. If you talk the talk, they will find out pretty quick if you can actually walk the walk. Good luck!
I lost a job not knowing this 25 years ago. I turned out alright though. Heh.
@@dgapp76 well said sir, to @John Mattern, remember this, you’re going in for an apprentice job. Trust me, they don’t expect you to know a whole lot. What you want to do is just like this dude said, be honest. I can tell you from experience, a good work ethic is worth TEN TIMESall the knowledge in the world. If you have a good work ethic, I can teach you anything you want to know about this industry. But without a good work ethic, and all the knowledge in the world, you’re just a lazy bum, nothing more. Good luck to ya buddy, I’m sure you’ll do well… or should I say, I’m sure you did well. One thing I LOVE about these unions, they’re not satisfied with making you a limited journeyman. When they get done with you, you’ll be a master of this trade. Congratulations, make the most of it…
Just takes a little bit just to be dangerous.
I have searched for this kind of video for the past eight months, but finally, I found it. Thank you for your effort.
Out of all the channels/videos on UA-cam regarding HVAC walkthroughs, yours is by FAR the absolute best. I really appreciate what you're doing here with this channel and am happy to see there's ads. Thank you for the amazing content and wisdom.
Wow, thanks!
I’m an auto tech, when we had HVAC out at our house one time I was talking to the tech about the HVAC I deal with and he said it’s similar but completely different. I can see he was 100% right.
You have no idea how much this has helped me. Fantastic explanation. Thank God for techs like you.
Glad to hear it!
I am an electrician and, this was a damn good video. I now kinda understand refrigerant. I bet if I watched it again id understand even more. Lots of terminology, which i want. Because that is how the hvac world speaks. Love it.
I have scoured all of UA-cam just to find out what you demonstrated here. Most educational videos assume that you know what saturation and subcooling and superheating are and go at a quite fast pace from one topic to another. If I buy anything, it's going to be from you. Thank you for taking the time and not assuming that people know things that they don't. Great work here!
Jeff that's so encouraging thanks!
Just stated HVACR school and my teacher recommended this channel thank you.
This is some great info, God Bless You. Your channel so helpful. This planet needs great people like You.
This was, by far, the least convoluted explanation I've gotten on this subject. I can finally understand the concept after way too long overthinking it and getting nowhere when someone else tries to explain it. Thanks a ton! I came here hoping for a little clarification and found a whole new way of thinking about it. The simple, yet in depth explanation was perfect!
This is a confidence builder. Listen apprentice don’t rely on your journeymen to teach you this. Ive purchased the book, it is awesome plus watched his videos. The best teacher Period. Thank you for posting.
Thank you very much Nickle& Dimez!
As an apprentice this channel has saved
me thousands
Stone, I really appreciate you letting me know! Make sure to read the articles I wrote as well at www.acservicetech.com thanks!
The best video to understand SH and SC
Wow Craig that's the best definition of "saturated" that I've ever heard!
Previous explanations just explanations just told me it was a mixture of liquid and vapor. You clarified that at this point it is not changing temperature. but only changing phase. For 12 years since Tech school I have understood super heat and subcooling but "saturated" has been sort of vague.
Thanks again for the excellent videos and I highly recommend your book and cards to anyone reading this!
thermodynamics requires a good explanation unless you are a genius. I was supposedly an A-student, but I still really didn't understand it well enough to remember it for very long.
As an engineer, but former tech, I enjoy watching such videos (usually the result of researching test equipment though). Overall, good explanation, just might have started with definitions of terms first (but that is just more preference in presentation). As mentioned in the video, or to make it more clear…
The temperature of the refrigerant decreases during the desuperheating and sub-cooling processes, but remains constant during the condensing process itself (gas to liquid, or as in the video the “saturated section”). The energy rejected from the refrigerant heats the secondary medium (copper or aluminum), whose temperature thus increases. However, The refrigerant pressure changes little from desuperheating to subcooling (think compressor to service valve). In a similar way to evaporation, the only pressure difference between the entrance and the exit of the heat exchanger is just the pressure drop (the equation is: pressure equals temperature times volume - which explains why your car tire pressure only changes with heat, but is the same wether mounted or not). Also, because the flow velocity in a condenser decreases, the induced pressure drop is much lower than in an evaporator. In other words, the pressure is rather stable throughout the high-side and low-side environment (between condenser and the expansion valve / orifice and vise versa).
Another key thing to remember, is that phase change is what takes the most energy (yet pressure is still rather constant). Thus, most heat is transferred during the condensing process (that process which is after desuperheating but before subcooling). Another mental tool I use to think of saturation is relating it to the opposite as in precipitation of say minerals from water; boiling water causes dissolved solids to precipitate (due to temperature change).
At minute 8:49 you mentioned if our target superheat was 9 degrees and super heat we got was 13 degrees, we are undercharged. Wanted clarification if that was a mistake. Since before that, you mentioned if our target was 13 and we got 17 then we would be overcharged. I appreciate this great video and your time.
Please disregard.
No problem, yeah they are reverse, high superheat= low charge, high subcooling overcharged, thanks!
Wow. I'm blown away. I finally after so many years understand subcooling and superheat. I don't know why but I've had a hard time understanding what they both meant...even after taking a refrigeration course 15 years ago! I got my universal 608 at that time but I'm not a technician. I just took the class to learn about refrigeration. I recently started watching videos again and tried to understand once again the difference between subcooling and superheat. And now I totally understand because of this video. Great explanation!
I have done HVAC 20 years as a lead maintenance for apartments and couldn't grasp the concept of superheat and subcooling until watching this video too!! I feel you bro.. It's like I leveled up in a video game..
I purchased both the hard-copy book and the e-book. Fantastic indeed. This video reminds me to re-read the book since warm weather is coming. If you don’t do this very often, you forget some things. The book is a perfect refresher. Thanks Craig, and keep up the great videos. I always look forward to watching them all!
Yeah summer is coming for sure! Thank you very much for your note!
You’ve dropped the mic on this Video, please keep the videos coming. Great job. More more more please.
this is the best way of explaining the meaning of the Subcooling and superheat ,thank you !
Glad you liked it!
The data plaque on condensing unit has written "TXV subcooling 15 deg F".
Can't get to the evaporator.
Is the plaque a dead give away as to it being a TXV ???
Thanks.
Tom
This video explains the concept of superheat and sub-cooling very clearly and accurately. Very good job! It just clarified my mind on this subject
Thats awesome to hear and if you want to see more visuals, check out the free articles on superheat and subcooling at www.acservicetech.com/articles thanks!
exactly the explanation i needed. An explanation looking at a diagram just doesn't click. Having the gauges and condenser there and instructing how it would be done in the field is much better.
Craig you are the best hvac guy on you tube I’ve been following you for a couple years now I learned so much from your videos
Wow, thanks!
Thanks!
Thank you very much!!!! I appreciate it!
Incredible speech! Short easy words to understand. Coherence in thinking and so easy to follow your mind and highly comprehensive comprehend!!! Thank you very much.
So great to hear that you valued the video, thanks! Make sure to read some of the articles on superheat and subcooling on our website at www.acservicetech.com thanks!
you are excellent at teaching learning more with you than in school I thank you a lot I have learned a lot with you
Glad to hear that!
Great explanation as always. Even though I know this already it’s always nice to have a refresher on how to properly explain it to someone.
Thanks a lot rev!
I just don't do enough HVAC to stay at expert level. But of course that's what your employer expects.
You explained that flawlessly, well done!!
Thank you!
Future service technician in the making here. Thanks for the invite to like your page on Facebook. I find your videos useful and have learned from this video. I'm very much blessed and appreciate this video 🙏🏼
That's awesome to hear Dustin!
I love this explanation I’m a contractor and I will use a similar way of explaining it to my trainees
Can’t wait to finally start in this field
Just ordered your manuals. Just took great notes. Thanks.
The best example of Cooling.
Thanks a lot Angel!
The subcooling method for checking refrigerant on a TXV system is recommended by HVAC industry standards and guidelines, such as those provided by the Air Conditioning, Heating, and Refrigeration Institute (AHRI) and HVAC training resources. This method ensures that the system has the correct charge since the TXV regulates superheat automatically.
Best description yet !
Sweet, I just ordered the cards, you got a sub, thanks for making our job easier
Thanks a lot Younis, please let me know what you think of them after you receive them!
Wow wow wow.... I am going to buy that book. I have watched tons of video to understand it, everyone talks about subcoolong yourcooling mycooling, put their face in front of the video and talk all day long all nonsense. Once in a while we find gems like this. The distance you mentioned about subcooling measurement made the biggest difference in understanding. It would be nice if you could create a video that explains the valves of the measuring unit, how to open, where to connect etc... would be good. I am not worried about my ac unit going bad because of my screw up during the learning process, my concern what if something explodes... hahahah. I hired someone to find the leak and he could not. A video on how to find leak would be good too. My ac is losing refrigerant very slowly, like in two years I have to refill. My unit is 6 years old.
Outstanding explanation. A lot of info covered in an easy to understand manner. Thank you.
great explanation of a common but relatively complicated topic. i bought the book
Glad it was helpful!
Thanks for the very detailed explanation. It made Superheat and Subcooling very clear to me after watching a couple of times.
Awesome to hear and check out our full length articles on superheat, subcooling, and delta t at our website at www.acservicetech.com thanks!
thank you guys for doing this im able to take in the lessons at my own speed ty
Very informative, thanks a lot 😎
Cant recommend this book enough. So simple to read and understand. Im not a tech so I dont service hvac systems enough to have this material become second nature. I read it last year, but forgot some stuff by this year. I decided to read the book again (something I would normally never do), and found it just as enjoyable as the first time i read it.
Best video on UA-cam explaining this thanks
Glad it was helpful!
I'm so glad I found this video so can learn how super heat
Glad you liked it!!
This was useful as I'm a bit rusty or perhaps rusted. I have other responsibilities that I deal with like plumbing and electrical and haven't recovered refrigerant in a long time.
I am impressed with your teaching abilities. Great job.
Your videos and your book are excelent! Saludos desde Mérida Yucatán México
So if it has a fixed orifice piston or capillary you measure the indoor wet bulb temperature and then the outside coil super heat for your total superheat and if it has a TXV then you just measure the tempeature off the liquid line coil and compare the red high side gauge for subcooling correct
excellent explanation, Craig. You are an asset to our profession! thanks for sharing!
I appreciate that! Thank you for your support!
Best video on this topic that I seen yet
Thank you for your support!
I thoroughly understood everything you said here but I just ordered the book because I want to be able to teach it as well as you. Awesome video! Keep it up! Thank you!
Very cool Michael! Please let me know what you think of the book after ordering it!
Knowledge you gain more when you share your knowledge to everyone.thank you for sharing this wonderful knowledge to us..it's very useful for being a hvac technicians. ..
Awesome, thanks big bite!
Your welcome sir.
It may be worth mentioning that you can have an illusion of higher subcooling if you have restriction somewhere, say if the filter dryer was a problem right?
Lot of info and well explained. Thanks for sharing valuable information.
Thanks a lot Juan!
Your videos are very thorough and simple to understand. 👍
I know I am getting way , way off BASE here .... except you guys are my favorite HVAC SITE . AM I TO UNDERSTAND THAT IN A SYSTEM THAT IS NOT RUNNING , THE HIGH AND LOW PRESSURES EQUALIZE .... and I am referring to AUTOMOTIVE !!!! NO CRANK , NO START 2005 HONDA CRV I would like to part out ..... THE AC IS KILLER COLD , WHEN RUNNING !!!!!!!
Great work! Very informative and easy to understand!
Glad it was helpful!
What an awesome video. How do I get a hands on those books
Thanks! www.acservicetech.com or www.amazon.com/shop/acservicetech
This is an extremely helpful and well produced video. Thank you!
I'm glad you enjoyed it!
Hey do you ever plan on doing a book on electrical wiring and troubleshooting or is that already in the book now and your videos are the best learning a lot thanks
The refrigerant charging book includes everything to prepare a system for refrigerant, refrigerant charging, troubleshooting while measuring the charge and airflow. The full outline is available at www.acservicetech.com/ac-book and I would like to get an electrical book together. It all takes a lot more time than anyone would ever think to make sure you get it done right. Thanks for letting me know what you would like to see!
this video helped me a lot to understand the superheat and subcooling, well explain
Glad to hear it!
Thank you for these video's and guides. You have been a blessing!! Thank you!!!
Excellent Explanation! Thank you...
Glad it was helpful!
@@acservicetechchannel May I simply suggest that you specify system "Running/Not Running" during these processes.... Thanks!
Excellent Description .. thanks
You are most welcome
I thought this was a great explanation of how to check the subcooled and superheated temperatures and explaining the process of both coils, compressor and expansion device. I did have one comment about what the saturated state means. A saturated liquid has a quality of 0% and a saturated vapor has a quality of 100% and the liquid-vapor state is everything in between. This is when the phase change is occurring and temperature is held constant.
Perfect Excellent Very Very informative video 👏👏👏👍👍👍
Thank you for watching!!
Thank you very much for the explanation. Very helpful.
Glad it was helpful!
This is so mind blowing and great video!!!
I am really glad you appreciated the video! That kind of info was what I tried to put into the book, the procedures and the why and why not, step by step instructions. Thanks for your note!
Questions you could install a sightglass to know if your low on freon
You don't neccesarily need any sight glass for air conditioning systems. You would measure the subcooling because these types are systems differ from refrigeration units.
Good Job Bro, very proud of you and how you explained everything
thank you for sharing your knowledge with us on every video for free. 👍
I played this video for both of our apprentices today, great explanation thanks for posting the video!
That's awesome, thanks HVAC Doc!
Best explanation recommendations thanks
Gary your are really good Teacher. Your Video reminders me of Chrisfix an Automotive DYI UA-camr also has the similar voice and rhythm.
Thank you very much sir for the tutorial, please sir,is sub cooling and superheat applicable in car A/C that uses r134a refrigerant?
Great video.. one thing I'm wondering.. Is it possible to alway check for the proper charge by just measuring the subcooling, and not worrying about the superheating? If so, then one doesn't have to worry about weather its a fixed-orifice meter or a TVX, no? I suppose you could check subcool and superheat, and if one is correct and the other wrong, it could give an indication that the "wrong" side of the system wasn't operating properly. Maybe you could elaborate on why you need to check both, whether they are sometimes inconsistent with each other even after the system has stabilized, and what to suspect in each of two inoconsistent subcool/superheat scenarios. Of course, if they are both consistent with each other, then there is either too much or too little refrigerant, and some needs to be recovered or added, etc. I know I'm asking a lot here, but I suspect you maybe able to simplify my concern. Thanks
This is Gold!!
Basically what i understood is this type of measurment is like playing darts you want the cooling in the evap to happen dead on center that way its not loosing it blower point, by the coolness not being release between after the coil and the lowside port??
But because the evap coil and consensor(outside) are not the same size it has to be right on the dot that way when you hit (heatmode) the reversing valve and the freon in the condensor isnt past its points as well?
Man if I had lessons like this 27 years ago I would’ve been a tech way sooner in my life. I’m still not great. lol but I get by pretty good. Being a good tech is not easy.
as a total noob - this explains it very well - thank you
Learned more pointers from this video then college. Thank you sir.
Thanks for watching! You can learn more on my website, www.acservicetech.com/resources
@@acservicetechchannel Looking now. Interested in putting a split unit in my home. More familiar trouble shooting & installing boilers then AC units so I'm doing my home work using your channel. Extremely helpful. Any manufacture recommended units (3-4 zones)
Thank you!
A lot of those carrier units if that tag on the condenser is still good it will tell you your subcooling temperature
Thanks for putting the procedure in a nutshell!!!
Great explanation Craig.God Bless.This is a refresher for me, am currently retired. But keeping touch helps me to undetstand better.
May The Lord Bless You Too Kenneth, thanks!
Excellent explanation
That's a lot of information. Useful practical. After seeing your theory video and now with this practical my life is complete. Q. Why do pump down videos show things going smoothly when I'd expect the compressor to stop working because closing the liquid line valve would make pressure sensor valve trigger or the vacuum created would trigger a too low pressure sensor cutting of compressor. Or do most have to bypass these sensors.
The low pressure sensor would be jumped out beforehand and on smaller systems there is no oil sensor. It is hard on the compressor though if there is no receiver, thanks!
Thank you explaining this.
Glad it was helpful!
I passed my E.P.A super proud , Now how do I go about getting a job in Hvac I haven't been hands on ? Any help would be gladly appreciated thanks ,And thanks for the great videos!
I've always thought, little red riding hood for the liquid line and big blue for the suction line. I've taught others that years ago and they tell me they use that all the time when explaining to others.
Good explanation
Thanks for liking