When I was training electrical engineers and electricians in troubleshooting, (industrial environment), I didn’t focus on memorizing information. I would stress on the importance of how a system worked. I found that when they understood the workings, most could be asked just about any question and had the correct answer. From watching your videos, it seems that you follow the same type of teaching. Your students are lucky to have a knowledgeable person as yourself to help in starting their career. 😀👍
If you don't know the sequence of operation and how the different components work and tie in, you'll only ever be guessing and that's a bad feeling.. Excellent point!
Great tip on note taking! I’ve been using my PC, IPad, cell, paper and a 4x6 whiteboard. The whiteboard is right next to my desk at work. I try to go over something first thing in the morning when I’m there. Thank you for the links from your site. My superheat and subcooling foundation is becoming very solid because of your TH-cam videos.
I cannot thank you enough for posting these videos. These are golden nuggets. I'm learning refrigeration on my own using your videos as a guide. Please keep up the good work. You're born for this! Thank you thank you thank you. 🙏🙏🙏
Hey Ty! My name is Brandon Benitez. I live in Atlanta and I am almost finished with my residential HVAC/R diploma and I had a really great teacher, Mr. Jerome English, that passed away recently but before that he would always show my class your videos and he talked so good about you and your style of teaching! Your videos really helped me a lot during this pandemic because zoom wasn't the easiest obstacle to get over lol but your videos are so well put together and you can tell you really enjoy teaching just like Mr. English did. Even on his sickest days he loved to come in and teach his "HVAC DRAGONS" as he called us LOL. Anyways just wanted to tell you to keep up the good work brother! Thanks again! P.S. For some reason I can't figure out how to get the subcooling notes up with the link to print it. The links are only giving the superheat notes on both videos.
Thank you very much for that. It really means a lot to me! I did not know the subcoolimg notes would not print I will see if I can get that fixed as soon as I can. Thank you for letting me know!
Thanks so much man . You are a great teacher. Hope you're channel blows up and you get a lot of subscribers and you get commission from TH-cam! Keep it up man
One thing to add on the low superheat that is so often overlooked is too much airflow. No one talks about it, no one has ever taught it, it's not in any hvac text books, but it exists. It's real. I'm talking airflow above the allowable from manufacturer fan performance charts. There's more than one reason they have an allowable range for a given system. It's not just for performance/SHR. It may not happen in residential systems,not sure, but in comercial when you have an ERV/ERU supplying outside air to a heatpump for example, you have the supply fan of the heatpump, plus a modulating amount of outside air ducted into the return of the heatpump, usually being controlled by c02 in the space. But sometimes these dampers can fail open. The reason nobody catches this is because you can obviously tell with your handometer that you have lots of airflow so you rule out airflow as the cause. Now obviously if that outside air was say 50f you would catch that since your return air entering the unit would be very low,much lower than the room temp, and that would also cause low superheat do to the non existent load. But this happened to me when outside air was 75 or so, so it was hard to find. The air goes through the evap too fast to allow the refrigerant to absorb enough heat. Not enough contact time. I spent alot of time on this system and most of that time I was completely baffled. It was a gshp w a txv so no manufacturer subcooling to go by, I pulled charge and it was the correct charge, I charged new refrigerant by weight, didn't fix it, waterside gpm was in range, replaced txv/drier, same problem, very low,about 2* sh. So I ended up investing in the fieldpiece hot wire anemometer and did a duct traverse on the return rite at the inlet to unit and took some static pressure readings as well and both confirmed I was way above the airflow range for that unit. I can't remember exactly but it was up around 1000cfm over the max for that unit size. That's when I had a look around and traced that outside air duct into a bathroom next room over,and that's where they had the actuator/damper for that unit above the ceiling in an access panel. I closed the damper manually, turned unit on and sh was back in range. Crazy. But worth sharing. Havnt seen it happen since. Also I'll add that I have come across an oil logged evap that gives same low superheat symptoms although it will be accompanied by major txv hunting and this is something that needs to be gone over too. It's not taught and it needs to be. Always check your crank case heaters guys and check air filters every time you work on a system. I like to call them compressor savers. Also never leave a water valve to a gshp or any water source hp with colder water temps manually open when an actuator fails in heating mode. I've replaced countless compressors for these reasons.
Testing people on relate material is essential . Your method of a grade test number in my book , is just a number . Had a teacher state this - test are a scholastic application of grade status to satisfy school requirements . To gain experience of hands on application then the understanding the trade and to apply taught and learned skills the principles of thermodynamics and practicality is what you should do . Live and learn is a day by day life long skill .
I preferred to not have a numbered test or a numerical grade at all. I wanted students to try and give me their best. I also felt failing a student for a number was unproductive, so offering a path for them to retain information was much more beneficial. I do prefer hands-on applied testing. The problem however is every school I taught required written tests of some sort. To them having something to file for a report was more important than education. Also, schools notoriously would not buy parts to keep the lab running or supplies to perform skills. More than 1 school would only allow 1 brazing rod per student for the entire brazing class and also would not allow for oxygen-acetylene refills. Many schools will hire a graduated student because they just want a person in front of the class. I was formally written up at 1 school because I did not use the PowerPoint presentation. I took the class and thought the same information in the lad and that was not allowed. I made written tests because I wanted to see what they knew such as describe the process for____. This was also frowned upon as schools wanted multiple-choice tests. I can tell you a multiple-choice test is not a method for evaluating a student's knowledge yet it is the most used method.
@@love2hvac Paul Graham, tech entrepreneur/start up incubator, posted an essay in December 2019, 'The Lesson to Unlearn' (paulgraham.com) about how the incentive is for students to get good grades over real learning. Parents, administrators, colleges all want to see good grades and care little about how much is actually learned or retained after the test. Students learn to hack the test/teacher to know what they need to put on the test for good grades. This is exactly the opposite of how students should learn a trade where knowledge is more important than test performance/grade. You know, like real life. Flipping 12 years of conditioning by the school system is required to break the "school helplessness" most students, especially those not the best academically, develop. School helplessness is having less initiative with school subjects compared to learning other things. Years of schooling develops passivity in students, with the reluctance to self-start and simply wait on the teacher to initiate. It's been known for over a century and is well developed in most students by 3rd grade. The exact opposite of what is needed to learn a trade.
@@jkbrown5496 I agree. The best learning tool is curiosity and resources. TH-cam is one of the many resources available now. There is no forced testing, attendance, social standards. Just people curious and want to learn.
@@jkbrown5496 I had my own company and growth was challenging finding employees that cared or wanted to grow. So many wanted only the shortcuts, grab a paycheck and go on. Shortcuts, bad habits, and untrained techs lead to many of the problems of this trade. I sold my business and moved to Miami. The company I worked for had the same issues. The people out of trade schools did not know the very basics but they had a piece of paper. I took over a 1/3 pay cut and got into teaching to try to make a difference. Over the 11 years of teaching, I have learned a lot. #1 schools are a business first. The profits and status of the owners are the priority over everything else. #2 admissions department is a sales department. They have sales quotas and are reviewed on the number of students they enroll and calls they make. They spend a fortune on marketing and except the seats to be filled at all cost. "You never lose a student to a better school only to a better admission rel" was quoted at many schools. Also "find their pain point and leverage that" was coached to paint a picture of how bad their life is without school. #3 The lie. The students were sold dreams of big paychecks, and emphasized "certifications". To the students, they just needed that paper and the crummy little tool bag to reach all their dreams and fix their life. Paying $10 to $30k and every weeknight for 10 months to 2 years for an EPA card and a 'certification" for a $16 per hour job in hot attics quickly crushes that dream. #4 student motivation. The students were motivated by getting a nice of paper and making big bucks. Like you said they need "good grades". So they can get the "certificate". They wanted to know the easiest path to get there. I remember being asked, " what is the minimum amount of time I have to be at school to still pass". "I already know this stuff, do I have to come to class". " I don't like to read" can I still pass. "I don't care why I just need to know how much freon to add" "can you tell my parole officer I was here ____day". " how much can I get for the tools". "I don't need to know this I just need a job" or "to satisfy my unemployment" or "so my parents let me stay at home". Don't forget, " I don't care about this I'm just here to collect my military benefits". (Thank you for all that served and thanks to all the great military students who did want to learn.) I hate testing but the vast majority of the students only care about the test as does the school. This is why I changed the test. Describe how you would do a vacuum. Describe how you would diagnose a system with a leak. #5 it's not about education. Students want the paper, the school wants their money, and the government's money. Lab supplies cost money. Using the lab makes it looks bad and harder for the admissions to sell. "We don't want the students doing _____ because someone could get hurt." They hire instructors that were students who just graduated. Interview questions did you work in hvac?/can you work nights? Can you work for $____k a year remember your giving back to the community? I had a student who did not come to class, did not participate in lab, did not take a test, said a compressor is an accessory that pumps solid and they passed him through. Instructors either burn out or just break and go through the motions. "Everybody passes"/the administration would say. Retaking a class was free for a student but that was another seat that admissions could not sell. #6 employers don't want to pay. Some of the most devoted students were there for the right reasons. And wanted to be the best where offered low-paying jobs. A student working fast food takes a loan for an industry that has a skilled worker shortage has to take a pay cut to get started. The companies in cities where schools pump lit students every 5 weeks can just pick up another one on the cheap, lay them off in the winter. The same companies that vent refrigerants, make money on selling and don't fix things. It's a broken system from elementary to the entry entry-level job. I have left the school system and work in the feild. I think if a person can take an EPA test understand the basics to land a job they can learn and earn. They can let their curiosity drive them as far as they wish. Their true test is life.
Unfortunately some trade schools don't care what the students get out of the classes ,they just collect the money. Training/practice/education will get you out of a basement!👍 🥃🥃🍺🍺🍺🍇🎳 Stay safe. Retired (werk'n) keyboard super tech. Wear your safety glasses.
Trade schools are a money making machine, which would be okay if they still provided an education. I know there are good ones out there but they are harder to find.
i love how you teach.could u find someone doing and teaching automotive ac .only one i have found is tom lech.he has sparked my thought process and got me watching u guys.tom does not have the time to teach like you.if you no someone out thier tell them to start a channel for us idiots thats not been taught right.please please
Second this. Seems like all this is applicable. Just wondering where I find target superheat/subcooling on a TXV system in a Tahoe? OEMs only ever talk about pressure
@@love2hvac the way you explain information is amazing man, and you have a real passion for the craft. There’s not many out there who make content like yours. Your videos and the Refrigeration Basics training program have been invaluable to me. Third year Apprentice in Australia doing commercial service, have been put in my own van and given more responsibility than usual after spending alot of evenings studying yours and others videos. Thanks man enjoy your weekend.
On a r410a, split with TXV, is it common that upon startup, the SH is 0 for about 2-3 min ? And then it will gradually reach the target at about the 5-6 min. Mark. How harmful is this to the scroll compressor?
Could too low of superheat cause any physical symptoms? Compressor fails over what time period if SH 5 to 0? Would the pressure safety switches high or low open to protect the system? Do think the you could swap compressor under warrenty for this type of failure?
When superheat is to low you can be at saturation, meaning liquid and vapor both exist. liquid is what kills the compressor. lit pushes the oil out of the bearings, it eats the varnish off the motor windings, it gets into the cylinder and breaks valves and crank shafts. No pressure switch will protect it as they only control on pressure. The only part that will protect it is a suction line accumulator which will be coming up soon. As for warranty, it depends. manufactures cant catch every compressor but if they do call it they will know what killed it and can potentially charge you for it. Most compressors replaced under warranty have nothing wrong with it and of those that have failed most are due to installation and operation deficiency not the compressor itself.
Hey Ty! I'm stuck at the point where you've discussed that less superheat indicates a flooded evaporator, and that might happen when the evaporator is small. I didn't quite understand this part. I thought about it this way. If the evaporator is small for the given space, that means for that much amount of air flow, the size of the evaporator is not big enough, which means there should be more boiling of the refrigerant, and hence the superheat should be higher in that case. I'm really confused here. Please help me out.
These videos below are the foundation before this video the notes. HVAC 030 Superheat the foundation HVAC 061 TXV TEV part 2 with target superheat. HVAC 062 TXV TEV target superheat I don't mean the evaporator is too small I mean the amount of vapor is too small. Take a cup and fill it 1/2 way with water. It's 50% full of liquid and 50% superheated vapor. As you add liquid to the cup you get less vapor or a smaller amount of vapor. If you could not see the liquid and you could only see the vapor you could still get an idea of how much liquid was in the cup. If there was a very small amount of vapor, then you know the cup had too much liquid. If there was a lot of vapor, there was not enough liquid.
Im not sure if I understood it correctly ... is there a relationship between the LP pressure on the suction line out of evaporator and the% content of the liquid in the refrigerant? I recently had a fault in the car AC System, where I had about 6bar at the outlet of the evaporator, is it related that I could flood the compressor?
Actual suction line temperature - Suction Saturated temp= Superheated vapor. No value in Pressures or temperatures alone. A tank of refrigerant with 30 pounds or 1/3 pound will have the same pressure and temperature.
Is target superheat and subcooling refrigerant specific as differrnt refrigerant have different heat capacities....also we will get different sized txv how it differ by superheat or pressure difference creation...?
Superheat is the same regardless if the refregerants. Isn't that awesome! I Properly sized TXV is important, I like the adjustable TXV, that way I can set it for the superheat I want. Many resedental TXV are non adjustable to save cost, but the manufacture will have literature for what they are set for.
@@love2hvac sir can you do a video enlisting why we cant use different refrigerant in a system as i have seen systems will be refrigerant specific....if you have already done, pardon,as i am still on 67 th video and so curious to know from u with examples😁
I will post a link below For all the words on the whiteboard. The purpose of this presentation is so a learner can follow along just as in class. Listing g and converting that into hand written text is a very powerful learning tool. The idea behind this video is so a learner can hear and write the notes along with the instructions as if they were in class. Just like class, few people can actually see the details of everything written. Many instructors now use power points with the individual words written clearly. While each point is clearly written out in clear text, it does not promote the learner to engage. Some learners will just ask for a copy or take a picture that will never get used again. Even though it's unlikely a learner will open the hand written notes again, the power of the brain taking audible information, processing it and converting it to written text with muscle movement greatly increases their chance of remembering the main points and recalling them later. The advantage to video is the learner can speed up, slow down, pause and replay unlike a classroom. Furthermore I include the notes in text on the website for free for those that want to make their own reference guide.
When I was training electrical engineers and electricians in troubleshooting, (industrial environment), I didn’t focus on memorizing information. I would stress on the importance of how a system worked. I found that when they understood the workings, most could be asked just about any question and had the correct answer. From watching your videos, it seems that you follow the same type of teaching. Your students are lucky to have a knowledgeable person as yourself to help in starting their career. 😀👍
If you don't know the sequence of operation and how the different components work and tie in, you'll only ever be guessing and that's a bad feeling.. Excellent point!
Great tip on note taking! I’ve been using my PC, IPad, cell, paper and a 4x6 whiteboard. The whiteboard is right next to my desk at work. I try to go over something first thing in the morning when I’m there. Thank you for the links from your site. My superheat and subcooling foundation is becoming very solid because of your TH-cam videos.
I cannot thank you enough for posting these videos. These are golden nuggets. I'm learning refrigeration on my own using your videos as a guide. Please keep up the good work. You're born for this! Thank you thank you thank you. 🙏🙏🙏
Thank you so much! I appreciate the support!
Thank you for sharing your knowledge. It makes one want to go deeper in to each aspect of refrigeration.
Great teaching thank you so much Teacher God bless you
Thanks for your training videos. It help us instructors to convey the information better so our students can understand
I don't know all the answers, but if you need help with anything I will give you all the help and ideas I can.
Awesome overview.! I keep practicing the ins and outs of refrigeration. All your notes help a ton.! Thanks Ty.!
Thanks from Bangladesh.
Hey Ty! My name is Brandon Benitez. I live in Atlanta and I am almost finished with my residential HVAC/R diploma and I had a really great teacher, Mr. Jerome English, that passed away recently but before that he would always show my class your videos and he talked so good about you and your style of teaching! Your videos really helped me a lot during this pandemic because zoom wasn't the easiest obstacle to get over lol but your videos are so well put together and you can tell you really enjoy teaching just like Mr. English did. Even on his sickest days he loved to come in and teach his "HVAC DRAGONS" as he called us LOL. Anyways just wanted to tell you to keep up the good work brother! Thanks again!
P.S. For some reason I can't figure out how to get the subcooling notes up with the link to print it. The links are only giving the superheat notes on both videos.
Thank you very much for that. It really means a lot to me!
I did not know the subcoolimg notes would not print I will see if I can get that fixed as soon as I can. Thank you for letting me know!
My doctor cured 70% of my cancer...........
Thank you for your videos, they have really helped me put some things together more.
Thanks so much man . You are a great teacher. Hope you're channel blows up and you get a lot of subscribers and you get commission from TH-cam! Keep it up man
One thing to add on the low superheat that is so often overlooked is too much airflow. No one talks about it, no one has ever taught it, it's not in any hvac text books, but it exists. It's real. I'm talking airflow above the allowable from manufacturer fan performance charts. There's more than one reason they have an allowable range for a given system. It's not just for performance/SHR. It may not happen in residential systems,not sure, but in comercial when you have an ERV/ERU supplying outside air to a heatpump for example, you have the supply fan of the heatpump, plus a modulating amount of outside air ducted into the return of the heatpump, usually being controlled by c02 in the space. But sometimes these dampers can fail open. The reason nobody catches this is because you can obviously tell with your handometer that you have lots of airflow so you rule out airflow as the cause. Now obviously if that outside air was say 50f you would catch that since your return air entering the unit would be very low,much lower than the room temp, and that would also cause low superheat do to the non existent load. But this happened to me when outside air was 75 or so, so it was hard to find. The air goes through the evap too fast to allow the refrigerant to absorb enough heat. Not enough contact time. I spent alot of time on this system and most of that time I was completely baffled. It was a gshp w a txv so no manufacturer subcooling to go by, I pulled charge and it was the correct charge, I charged new refrigerant by weight, didn't fix it, waterside gpm was in range, replaced txv/drier, same problem, very low,about 2* sh. So I ended up investing in the fieldpiece hot wire anemometer and did a duct traverse on the return rite at the inlet to unit and took some static pressure readings as well and both confirmed I was way above the airflow range for that unit. I can't remember exactly but it was up around 1000cfm over the max for that unit size. That's when I had a look around and traced that outside air duct into a bathroom next room over,and that's where they had the actuator/damper for that unit above the ceiling in an access panel. I closed the damper manually, turned unit on and sh was back in range. Crazy. But worth sharing. Havnt seen it happen since. Also I'll add that I have come across an oil logged evap that gives same low superheat symptoms although it will be accompanied by major txv hunting and this is something that needs to be gone over too. It's not taught and it needs to be. Always check your crank case heaters guys and check air filters every time you work on a system. I like to call them compressor savers. Also never leave a water valve to a gshp or any water source hp with colder water temps manually open when an actuator fails in heating mode. I've replaced countless compressors for these reasons.
I love ser thank you so much
love it, thank you so much 😊
great information. 🇩🇴👍🏻✅💯🌎🙏👌🏽👏🏼🤗🇺🇸🔥
Testing people on relate material is essential . Your method of a grade test number in my book , is just a number . Had a teacher state this - test are a scholastic application of grade status to satisfy school requirements . To gain experience of hands on application then the understanding the trade and to apply taught and learned skills the principles of thermodynamics and practicality is what you should do . Live and learn is a day by day life long skill .
I preferred to not have a numbered test or a numerical grade at all. I wanted students to try and give me their best. I also felt failing a student for a number was unproductive, so offering a path for them to retain information was much more beneficial.
I do prefer hands-on applied testing. The problem however is every school I taught required written tests of some sort. To them having something to file for a report was more important than education. Also, schools notoriously would not buy parts to keep the lab running or supplies to perform skills.
More than 1 school would only allow 1 brazing rod per student for the entire brazing class and also would not allow for oxygen-acetylene refills.
Many schools will hire a graduated student because they just want a person in front of the class.
I was formally written up at 1 school because I did not use the PowerPoint presentation. I took the class and thought the same information in the lad and that was not allowed.
I made written tests because I wanted to see what they knew such as describe the process for____.
This was also frowned upon as schools wanted multiple-choice tests. I can tell you a multiple-choice test is not a method for evaluating a student's knowledge yet it is the most used method.
@@love2hvac Paul Graham, tech entrepreneur/start up incubator, posted an essay in December 2019, 'The Lesson to Unlearn' (paulgraham.com) about how the incentive is for students to get good grades over real learning. Parents, administrators, colleges all want to see good grades and care little about how much is actually learned or retained after the test. Students learn to hack the test/teacher to know what they need to put on the test for good grades.
This is exactly the opposite of how students should learn a trade where knowledge is more important than test performance/grade. You know, like real life. Flipping 12 years of conditioning by the school system is required to break the "school helplessness" most students, especially those not the best academically, develop. School helplessness is having less initiative with school subjects compared to learning other things. Years of schooling develops passivity in students, with the reluctance to self-start and simply wait on the teacher to initiate. It's been known for over a century and is well developed in most students by 3rd grade. The exact opposite of what is needed to learn a trade.
@@jkbrown5496
I agree. The best learning tool is curiosity and resources.
TH-cam is one of the many resources available now. There is no forced testing, attendance, social standards. Just people curious and want to learn.
@@jkbrown5496
I had my own company and growth was challenging finding employees that cared or wanted to grow.
So many wanted only the shortcuts, grab a paycheck and go on. Shortcuts, bad habits, and untrained techs lead to many of the problems of this trade.
I sold my business and moved to Miami. The company I worked for had the same issues. The people out of trade schools did not know the very basics but they had a piece of paper.
I took over a 1/3 pay cut and got into teaching to try to make a difference. Over the 11 years of teaching, I have learned a lot.
#1 schools are a business first. The profits and status of the owners are the priority over everything else.
#2 admissions department is a sales department. They have sales quotas and are reviewed on the number of students they enroll and calls they make. They spend a fortune on marketing and except the seats to be filled at all cost. "You never lose a student to a better school only to a better admission rel" was quoted at many schools. Also "find their pain point and leverage that" was coached to paint a picture of how bad their life is without school.
#3 The lie. The students were sold dreams of big paychecks, and emphasized "certifications".
To the students, they just needed that paper and the crummy little tool bag to reach all their dreams and fix their life. Paying $10 to $30k and every weeknight for 10 months to 2 years for an EPA card and a 'certification" for a $16 per hour job in hot attics quickly crushes that dream.
#4 student motivation. The students were motivated by getting a nice of paper and making big bucks. Like you said they need "good grades". So they can get the "certificate". They wanted to know the easiest path to get there. I remember being asked, " what is the minimum amount of time I have to be at school to still pass". "I already know this stuff, do I have to come to class". " I don't like to read" can I still pass. "I don't care why I just need to know how much freon to add" "can you tell my parole officer I was here ____day". " how much can I get for the tools". "I don't need to know this I just need a job" or "to satisfy my unemployment" or "so my parents let me stay at home".
Don't forget, " I don't care about this I'm just here to collect my military benefits". (Thank you for all that served and thanks to all the great military students who did want to learn.)
I hate testing but the vast majority of the students only care about the test as does the school. This is why I changed the test. Describe how you would do a vacuum. Describe how you would diagnose a system with a leak.
#5 it's not about education.
Students want the paper, the school wants their money, and the government's money. Lab supplies cost money. Using the lab makes it looks bad and harder for the admissions to sell. "We don't want the students doing _____ because someone could get hurt." They hire instructors that were students who just graduated. Interview questions did you work in hvac?/can you work nights? Can you work for $____k a year remember your giving back to the community? I had a student who did not come to class, did not participate in lab, did not take a test, said a compressor is an accessory that pumps solid and they passed him through. Instructors either burn out or just break and go through the motions. "Everybody passes"/the administration would say. Retaking a class was free for a student but that was another seat that admissions could not sell.
#6 employers don't want to pay.
Some of the most devoted students were there for the right reasons. And wanted to be the best where offered low-paying jobs. A student working fast food takes a loan for an industry that has a skilled worker shortage has to take a pay cut to get started. The companies in cities where schools pump lit students every 5 weeks can just pick up another one on the cheap, lay them off in the winter. The same companies that vent refrigerants, make money on selling and don't fix things.
It's a broken system from elementary to the entry entry-level job.
I have left the school system and work in the feild. I think if a person can take an EPA test understand the basics to land a job they can learn and earn. They can let their curiosity drive them as far as they wish. Their true test is life.
Facts 💯💯💯
great content.
Unfortunately some trade schools don't care what the students get out of the classes ,they just collect the money.
Training/practice/education will get you out of a basement!👍
🥃🥃🍺🍺🍺🍇🎳
Stay safe.
Retired (werk'n) keyboard super tech.
Wear your safety glasses.
Trade schools are a money making machine, which would be okay if they still provided an education.
I know there are good ones out there but they are harder to find.
i love how you teach.could u find someone doing and teaching automotive ac .only one i have found is tom lech.he has sparked my thought process and got me watching u guys.tom does not have the time to teach like you.if you no someone out thier tell them to start a channel for us idiots thats not been taught right.please please
Second this. Seems like all this is applicable. Just wondering where I find target superheat/subcooling on a TXV system in a Tahoe? OEMs only ever talk about pressure
Great video
Thanks🤩
Great
Hey Ty, will you ever have electrical videos that go in depth just like the refrigeration cycle ?
I'm working on them now
@@love2hvac thank you !! This is one area I struggle with as a new tech !
You’re a legend Ty
I appreciate the comment but there are so many better than me. I'm just out sharing what I can.
@@love2hvac the way you explain information is amazing man, and you have a real passion for the craft. There’s not many out there who make content like yours. Your videos and the Refrigeration Basics training program have been invaluable to me. Third year Apprentice in Australia doing commercial service, have been put in my own van and given more responsibility than usual after spending alot of evenings studying yours and others videos. Thanks man enjoy your weekend.
That's awesome! I love hearing stories of success and important!
I lived in Australia for a year and a absolutely loved it. I can't wait to return.
In your subcooling video you mentioned dew , where does bubble come into effect?
I will be covering that soon.
It will play a part in blended refrigerants such as all 400 series 404A, 407C and so on
Ty can super heat be calculated on a residential refrigerator that has a capillary tube? Love the video
In theory yes. But it's such a small charge I've just weighed it in.
On a r410a, split with TXV, is it common that upon startup, the SH is 0 for about 2-3 min ? And then it will gradually reach the target at about the 5-6 min. Mark. How harmful is this to the scroll compressor?
Sometimes that will happen. Crank case heaters and singing valves during off cycle help protect that.
Could too low of superheat cause any physical symptoms? Compressor fails over what time period if SH 5 to 0? Would the pressure safety switches high or low open to protect the system?
Do think the you could swap compressor under warrenty for this type of failure?
When superheat is to low you can be at saturation, meaning liquid and vapor both exist. liquid is what kills the compressor. lit pushes the oil out of the bearings, it eats the varnish off the motor windings, it gets into the cylinder and breaks valves and crank shafts. No pressure switch will protect it as they only control on pressure. The only part that will protect it is a suction line accumulator which will be coming up soon.
As for warranty, it depends. manufactures cant catch every compressor but if they do call it they will know what killed it and can potentially charge you for it. Most compressors replaced under warranty have nothing wrong with it and of those that have failed most are due to installation and operation deficiency not the compressor itself.
Hey Ty! I'm stuck at the point where you've discussed that less superheat indicates a flooded evaporator, and that might happen when the evaporator is small. I didn't quite understand this part. I thought about it this way. If the evaporator is small for the given space, that means for that much amount of air flow, the size of the evaporator is not big enough, which means there should be more boiling of the refrigerant, and hence the superheat should be higher in that case. I'm really confused here. Please help me out.
These videos below are the foundation before this video the notes.
HVAC 030 Superheat the foundation
HVAC 061 TXV TEV part 2 with target superheat.
HVAC 062 TXV TEV target superheat
I don't mean the evaporator is too small I mean the amount of vapor is too small.
Take a cup and fill it 1/2 way with water. It's 50% full of liquid and 50% superheated vapor.
As you add liquid to the cup you get less vapor or a smaller amount of vapor. If you could not see the liquid and you could only see the vapor you could still get an idea of how much liquid was in the cup.
If there was a very small amount of vapor, then you know the cup had too much liquid.
If there was a lot of vapor, there was not enough liquid.
Im not sure if I understood it correctly ... is there a relationship between the LP pressure on the suction line out of evaporator and the% content of the liquid in the refrigerant? I recently had a fault in the car AC System, where I had about 6bar at the outlet of the evaporator, is it related that I could flood the compressor?
Actual suction line temperature - Suction Saturated temp= Superheated vapor.
No value in Pressures or temperatures alone.
A tank of refrigerant with 30 pounds or 1/3 pound will have the same pressure and temperature.
Is target superheat and subcooling refrigerant specific as differrnt refrigerant have different heat capacities....also we will get different sized txv how it differ by superheat or pressure difference creation...?
Superheat is the same regardless if the refregerants. Isn't that awesome!
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Properly sized TXV is important, I like the adjustable TXV, that way I can set it for the superheat I want. Many resedental TXV are non adjustable to save cost, but the manufacture will have literature for what they are set for.
@@love2hvac sir can you do a video enlisting why we cant use different refrigerant in a system as i have seen systems will be refrigerant specific....if you have already done, pardon,as i am still on 67 th video and so curious to know from u with examples😁
Greetings, great content, it is possible to modify the formula Target SH = [(IDWB X 3) - ODT - 80] / 2 for degrees centigrade.
That is a great question! I do not know the answer lete see what I can find.
The words on your whiteboard are too small. Suggest that you review this mode of presentation.
I will post a link below For all the words on the whiteboard.
The purpose of this presentation is so a learner can follow along just as in class. Listing g and converting that into hand written text is a very powerful learning tool. The idea behind this video is so a learner can hear and write the notes along with the instructions as if they were in class. Just like class, few people can actually see the details of everything written.
Many instructors now use power points with the individual words written clearly. While each point is clearly written out in clear text, it does not promote the learner to engage. Some learners will just ask for a copy or take a picture that will never get used again.
Even though it's unlikely a learner will open the hand written notes again, the power of the brain taking audible information, processing it and converting it to written text with muscle movement greatly increases their chance of remembering the main points and recalling them later.
The advantage to video is the learner can speed up, slow down, pause and replay unlike a classroom.
Furthermore I include the notes in text on the website for free for those that want to make their own reference guide.
www.love2hvac.com/supporting-documents
Thanks 😉