Hello Craig and Brian, please write a book on HVAC electricity and troubleshooting. Show us all the electrical components and the control board. I will be the first to buy your book.
As a home owner, I have a better understanding of how a properly installed system should work. I'm not a technician by any means, but due to my Navy career I know certain systems need to be monitored. I brought a new construction home with the HVAC system mismatched and undersized 10 years ago. (1990 sq ft, 2 ton compressor, 3 ton coil). The company that installed the system never responded to my questions about the AC mismatch. Knowledge is power. After reviewing a few UA-cam videos, this one as well, I know I need a new HVAC system so I don't murder my compressor.
@@tekjunkie28 You would ideally have a coil .5 ton over the condenser but 1. isn't completely out of range depending on other factors they likely don't have time to explain to every resident.
It doesn’t sound terrible, a lot of coils are oversized to sap more moisture out of the air. It has the ability to be more efficient too depending on the size of your ductwork and air restriction
@@davidthomas2585 I appreciate the information you provided. It occasionally gets humid here in California, nothing like Georgia or Florida where this would be beneficial. I have too many questions to burden you with. Besides Google where or what source can I use to be more knowledgeable about this so I don't get the wool pulled over my eyes when I need a new system?
2 reasons for oversized evap ....energy efficiency incentives and the other is humidity at lower temps.... ie the Midwest or southeast.. the condenser imo is always better bigger! That lowers the airspeed necessary to subcool the refrigerant = saving fan energy costs. From experience, place your condenser 3 ft off the ground if you want it to last. Northside of structure where it can operate in the shade without a roof or plants blocking the upblast of air. R32 will lower your bill and up the efficiency but the coils are designed as low of a charge possible.... good to see you take an interest in such things. It pays off, anyone who doesn't have time to explain isn't worth your business. Thank-you for your service. My mom is a sea bee (retired) and my grandad was a captain in the navy... the more you surf yt the more you will find on the hvac info...this channel is my fave for sharpening/ staying up to date....
Dear Craig, I really appreciate the time and effort that you put into accurate and excellent quality videos. I always learn so much from you. Everytime I learn something new from you, I crave to learn more. Videos are excellent because I play them over and over until I lock in on those key concepts. Thank you again from Johnsburg, Illinois.
Another good HVAC video that makes you think about what is going on inside the A/C unit. The relationship between superheat with a fixed orifice tube & subcooling with a thermal expansion valve is an important concept to understand. Our gauges & temperature probes tell us what's going on inside the unit's evaporator & condenser. This I why I continue to watch your videos, they are great educational tools/reminders.
thanks very much for helping people achieve their dreams. you are impacting lives all over the globe 🌎. I am Saidu sannoh from west Africa Sierra Leone. you are My mentor.
Muy buena clase, sigo mucho sus videos por la calidad y profesionalidad a pesar de que no puedo aprovechar del todo por el idioma, gracias, thank you so much
Your videos and information that you provide are priceless. You explain things very well!!! You get down to the “what” and “why”, without confusing anyone. Great job!!
i've watched alot of your videos, really glad u have them, it's helped me a lot. Ps - just a constructive comment....sometimes it helps to slow down alittle, i need to digest it more as u present it.
Hi and thanks 👍🏻 Questions 10:54 If the refrigerant is in a saturated state throughout the system, does that include the compressor? If so, why isn't it damaged? 27:50 Why is the wet bulb temperature measured and not the dry bulb temperature in the evaporator? Why is WB not also measured in the condenser? 31:05 Could low superheat also mean that the equipment is oversized?
I would be very interested in seeing a series on geothermal heat pumps, especially purging the ground loops and measuring how much heat is dumped or sourced from the loops and the different refrigerant charge measurement strategy.
I have watched a bunch of videos just because. It is interesting the difference in approach and view on A/C with this and automotive, even though it is the same thing. In automotive (MVAC) cooling is taught, not super heat. When a liquid evaporates, it absorbs heat. That makes the air passing over the evaporator coil very cold, which is what the customer knows. In HVAC, they describe the refrigerant as absorbing heat, which it does.
Awesome video! I'm addicted to watching both your guys' videos. Glad you team up once in a while. It's like when Fonzie shows up on Laverne and Shirley. Question: if I'm in a situation where there is an "X" (low wet bulb temp and high outdoor temp, piston metering device) and my system is running with very little superheat, what can I do? Should I recover refrigerant to bring up the total superheat to at least 5 degrees? If I did this, then it would simply mean that when I'm operating at other "non-X" conditions, I'd have more superheat than I need. Or does it mean I should just never run my system in an "X" condition? If I'm anticipating that I'll be running in "X" condition more often then "non-X" conditions, then wouldn't it be OK to leave the system optimized for "X" condition? Or maybe it's impossible to be optimized for an "X" condition because removing refrigerant would lower the subcooling, and then I'd have the liquid boiling before it hits the metering device.
If a system leaks a significant quantity of refrigerant, should you also add a small amount of compressor oil when you recharge it after fixing the leak?
thanks for your informative videos, i learn a lot. I do have a question. I heard that the service port of the liquid line is comes after the expansion valve, so you cant measure the high prssure, unless u put the airconditioning in heating mode. Is that correct?
lol, didn't catch that, but I'm a shirt sleeve guy. I wreck all my shirts sweat and dirty face, learned that doing mechanical work and plumbing. grease and worse, you learn to not touch anything real fast and clean everything good.
I just would love to find a HVAC job in Norfolk Va I spent my entire life in this career, I don't know it all and willing to start over, I just want to go to work
22:08 - Craig, Where did you get this formula? [(3 x WB) - 80 - DB] /2 Where did you get these numbers to calculate your chart? 35:39 - [(3 x 57) - 80 - 95]/2 = -4, so no target.
Just became a helper after getting my epa 608 and the tech tells me if the Freon gauge reads anywhere between 40-50psi it’s good on Freon levels 🤦🏾♂️🤣
Love videos, but i have a question about mobile refrigeration units. Is there a subcooling chart for refrigerants like 404a and 452a? Like for thermoking 1080s as an example that run from -20F to 80F. I usually rely on receiver drier site glass to see how much ball floats when running and look at resting pressure before i start unit. To check charge.
So, at subzero, setpoint the goal is to always try and keep superheat 6 or above no matter what ambient temps are? I was told If you have a txv, you don't go by superheat and that we go by subcooling. I don't have refrigeration training. I did like a week class through job to get a 608.
I love AC service tech passion and training videos, but why is the student just standing there behind the system? The best part of the class is when he told the "students" to relocate. That's one of my ground rules when I'm training students. I need your undivided attention, and that means all eyes on me.
i was installing split ac that has r410a its single zoon 12000btu system. Durring installation I accidently open valve that lost some refrigrant. Now I am trying to figure out how much do I need to add back. It only has low pressure side port, if I am running AC on full in 80f outside I see pressure of 120 is that to much? what would be acceptable range in that case.
Is it a regular central split system or mini split? The central split system either goes by superheat or subcool. Which most modern a/c will go by subcool because the metering device is a TXV or EEV. Most mini split manufactures will go by weighing in the refrigerant.
@@sajjadakhter7261 the only way you can see how much you need to add is recover the refrigerant from the unit with a recovery machine and recovery tank. Read what the factory charge weight is on the nameplate of the unit. Pull a vacuum to at least 500 microns (the deeper the better). Weigh in the refrigerant with refrigerant scales to keep track of what you're weighing in. If you opened the valve and the refrigerant sprayed for a few seconds, you'll be alright and probably don't need to add any unless the refrigerant line set is pretty long. Most mini splits can run pretty decent with 30% of its charge left believe it or not. EEVs metering devices are really efficient. 120 psig? If that's suction pressure, then you're pretty good tbh. Mini splits can handle an undercharge better than central AC systems. I've literally seen mini splits run pretty decent for a long time on 30% of it's charge left due to a bad flare.
I can't stand this group of students. As an instructor for a different industry I can't stand when I ask a question & no one answers..... like the simple superheat chart questions....crickets...
In the United States? Explain yourself player. Not many countries have the forced air systems like here. Been following you for years but call it what it is bud. Air flow was not as big a factor or they didn't know as much about it as is now it's a big factor. They threw in duct work and that was that. Filters blower motors nowadays do not work well with duct work that was put in in the 60s or 70s.
Why you never cover VRF systems...Don'g they exist in America!!! From the UK and bought your book but never obtained information I have been longing for Would you please do a video on how to carry out pressure leak test on a VRF system!!
In school for HVAC currently. This video just made so much more sense than I could’ve imagined 2 months ago! Solid information
Good luck in school!! Check out the free quizzes and articles on our website!
@@acservicetechchannel thanks!! Will do
This brings back memories of being in the HVAC school when I was younger, glad these guys are learning to get into this trade.
Hello Craig and Brian, please write a book on HVAC electricity and troubleshooting. Show us all the electrical components and the control board. I will be the first to buy your book.
I’ll be the second one ☝️
I agree.
I will buy it ASAP.
As a home owner, I have a better understanding of how a properly installed system should work. I'm not a technician by any means, but due to my Navy career I know certain systems need to be monitored. I brought a new construction home with the HVAC system mismatched and undersized 10 years ago. (1990 sq ft, 2 ton compressor, 3 ton coil). The company that installed the system never responded to my questions about the AC mismatch. Knowledge is power. After reviewing a few UA-cam videos, this one as well, I know I need a new HVAC system so I don't murder my compressor.
Thats not exactly a mismatch.. Back in the day that used to be pretty common in humid places AFAIK
@@tekjunkie28 You would ideally have a coil .5 ton over the condenser but 1. isn't completely out of range depending on other factors they likely don't have time to explain to every resident.
It doesn’t sound terrible, a lot of coils are oversized to sap more moisture out of the air. It has the ability to be more efficient too depending on the size of your ductwork and air restriction
@@davidthomas2585 I appreciate the information you provided. It occasionally gets humid here in California, nothing like Georgia or Florida where this would be beneficial. I have too many questions to burden you with. Besides Google where or what source can I use to be more knowledgeable about this so I don't get the wool pulled over my eyes when I need a new system?
2 reasons for oversized evap ....energy efficiency incentives and the other is humidity at lower temps.... ie the Midwest or southeast.. the condenser imo is always better bigger! That lowers the airspeed necessary to subcool the refrigerant = saving fan energy costs. From experience, place your condenser 3 ft off the ground if you want it to last. Northside of structure where it can operate in the shade without a roof or plants blocking the upblast of air. R32 will lower your bill and up the efficiency but the coils are designed as low of a charge possible.... good to see you take an interest in such things. It pays off, anyone who doesn't have time to explain isn't worth your business. Thank-you for your service. My mom is a sea bee (retired) and my grandad was a captain in the navy... the more you surf yt the more you will find on the hvac info...this channel is my fave for sharpening/ staying up to date....
Dear Craig, I really appreciate the time and effort that you put into accurate and excellent quality videos. I always learn so much from you. Everytime I learn something new from you, I crave to learn more. Videos are excellent because I play them over and over until I lock in on those key concepts. Thank you again from Johnsburg, Illinois.
The opioids and other opioids that
Another good HVAC video that makes you think about what is going on inside the A/C unit. The relationship between superheat with a fixed orifice tube & subcooling with a thermal expansion valve is an important concept to understand. Our gauges & temperature probes tell us what's going on inside the unit's evaporator & condenser. This I why I continue to watch your videos, they are great educational tools/reminders.
thanks very much for helping people achieve their dreams. you are impacting lives all over the globe 🌎. I am Saidu sannoh from west Africa Sierra Leone. you are My mentor.
Thank you for watching my videos!
This stuff is GOLD. Sooooo appreciated.
This bloke. Great teacher. Respect
Muy buena clase, sigo mucho sus videos por la calidad y profesionalidad a pesar de que no puedo aprovechar del todo por el idioma, gracias, thank you so much
Great lesson, thanks.
Your videos and information that you provide are priceless. You explain things very well!!! You get down to the “what” and “why”, without confusing anyone. Great job!!
what a privilege it be to be taught by Ty and Craig!
really good video to watch after reading through chapter 7 and working through the textbook
i've watched alot of your videos, really glad u have them, it's helped me a lot. Ps - just a constructive comment....sometimes it helps to slow down alittle, i need to digest it more as u present it.
Really Helpful... Anybody could learn easily ❤
great video!
Great video, I screenshotted the helpful Suprrheat chart
Excelente lo espero muy pronto este video en español.gracias
You can turn on captions and also use auto translate for Spanish.
I’m not sure if this is his ch the person that’s teaching but u do a wonderful job
Thanks for the Lexi are been following you from Liberia
Hi and thanks 👍🏻
Questions
10:54 If the refrigerant is in a saturated state throughout the system, does that include the compressor? If so, why isn't it damaged?
27:50 Why is the wet bulb temperature measured and not the dry bulb temperature in the evaporator? Why is WB not also measured in the condenser?
31:05 Could low superheat also mean that the equipment is oversized?
Great videos 😊
great teaching
Amazing instructor!
I would be very interested in seeing a series on geothermal heat pumps, especially purging the ground loops and measuring how much heat is dumped or sourced from the loops and the different refrigerant charge measurement strategy.
I have watched a bunch of videos just because. It is interesting the difference in approach and view on A/C with this and automotive, even though it is the same thing. In automotive (MVAC) cooling is taught, not super heat. When a liquid evaporates, it absorbs heat. That makes the air passing over the evaporator coil very cold, which is what the customer knows. In HVAC, they describe the refrigerant as absorbing heat, which it does.
I love these videos
As Always thank you Teacher Craig 👍👍 very informative and Helpful...... but this is Schooling 😅❤😂
Great Tutorial, thanks
Good stuff. Thank you for sharing.
Great content ! It is appreciated !
Great video, thank you!
Thank you 💪🙏
Awesome video! I'm addicted to watching both your guys' videos. Glad you team up once in a while. It's like when Fonzie shows up on Laverne and Shirley. Question: if I'm in a situation where there is an "X" (low wet bulb temp and high outdoor temp, piston metering device) and my system is running with very little superheat, what can I do? Should I recover refrigerant to bring up the total superheat to at least 5 degrees? If I did this, then it would simply mean that when I'm operating at other "non-X" conditions, I'd have more superheat than I need. Or does it mean I should just never run my system in an "X" condition? If I'm anticipating that I'll be running in "X" condition more often then "non-X" conditions, then wouldn't it be OK to leave the system optimized for "X" condition? Or maybe it's impossible to be optimized for an "X" condition because removing refrigerant would lower the subcooling, and then I'd have the liquid boiling before it hits the metering device.
Sir...thank u very much...i learned a lot from this topic ... I'm from the Philippines..More power..God bless..
Great lecture. Thanks for sharing.
didn't realize the man in blue was MR. Ty until I heard his name, lol.
very good
I’m here for it
If a system leaks a significant quantity of refrigerant, should you also add a small amount of compressor oil when you recharge it after fixing the leak?
The explanation A/c service Tec
👍👍👍👍 also they have en español
thanks for your informative videos, i learn a lot. I do have a question. I heard that the service port of the liquid line is comes after the expansion valve, so you cant measure the high prssure, unless u put the airconditioning in heating mode. Is that correct?
Good videos,i have watched a few. When you ask questions could you repeat the answers as i can not hear most of the answers?
Awesome 😅😅😅th😊anks
Beautiful how he use the PPE...
Gloves touching refrigerant / oil and then scrubbing nose and face... LoL
lol, didn't catch that, but I'm a shirt sleeve guy. I wreck all my shirts sweat and dirty face, learned that doing mechanical work and plumbing. grease and worse, you learn to not touch anything real fast and clean everything good.
I just would love to find a HVAC job in Norfolk Va I spent my entire life in this career, I don't know it all and willing to start over, I just want to go to work
Why is there a core removal tool on the yellow line? Why not crack it open on the back and purge it as well?
I got the book 📖
That's so awesome! Let me know what you think of it after reading!
I’m back in the classroom
Between eui. Fluke and fieldpeice which brand would you reccomend and go with. For a multimeter ?
22:08 - Craig, Where did you get this formula? [(3 x WB) - 80 - DB] /2 Where did you get these numbers to calculate your chart?
35:39 - [(3 x 57) - 80 - 95]/2 = -4, so no target.
Just became a helper after getting my epa 608 and the tech tells me if the Freon gauge reads anywhere between 40-50psi it’s good on Freon levels 🤦🏾♂️🤣
So I gather getting techs from southwest over to south east may require some adjustments due to climate differences and accumulators?
POE oil is used for R 410a that is a great thing to look at to determine refrigerants! The oil!
Mineral oil used in R 22 !
Great demo thanks for sharing
Love videos, but i have a question about mobile refrigeration units. Is there a subcooling chart for refrigerants like 404a and 452a? Like for thermoking 1080s as an example that run from -20F to 80F. I usually rely on receiver drier site glass to see how much ball floats when running and look at resting pressure before i start unit. To check charge.
So, at subzero, setpoint the goal is to always try and keep superheat 6 or above no matter what ambient temps are? I was told If you have a txv, you don't go by superheat and that we go by subcooling. I don't have refrigeration training. I did like a week class through job to get a 608.
Do you do your book for the uk market
how this training works ? i am interested in training also
👍👍
Right meow
I love AC service tech passion and training videos, but why is the student just standing there behind the system? The best part of the class is when he told the "students" to relocate. That's one of my ground rules when I'm training students. I need your undivided attention, and that means all eyes on me.
i was installing split ac that has r410a its single zoon 12000btu system. Durring installation I accidently open valve that lost some refrigrant. Now I am trying to figure out how much do I need to add back. It only has low pressure side port, if I am running AC on full in 80f outside I see pressure of 120 is that to much? what would be acceptable range in that case.
Is it a regular central split system or mini split? The central split system either goes by superheat or subcool. Which most modern a/c will go by subcool because the metering device is a TXV or EEV.
Most mini split manufactures will go by weighing in the refrigerant.
@@acomman77 its a mini split, my concern is i don't know how much refrigerant really lost so how much I refill.
@@sajjadakhter7261 the only way you can see how much you need to add is recover the refrigerant from the unit with a recovery machine and recovery tank. Read what the factory charge weight is on the nameplate of the unit. Pull a vacuum to at least 500 microns (the deeper the better). Weigh in the refrigerant with refrigerant scales to keep track of what you're weighing in.
If you opened the valve and the refrigerant sprayed for a few seconds, you'll be alright and probably don't need to add any unless the refrigerant line set is pretty long. Most mini splits can run pretty decent with 30% of its charge left believe it or not. EEVs metering devices are really efficient.
120 psig? If that's suction pressure, then you're pretty good tbh. Mini splits can handle an undercharge better than central AC systems. I've literally seen mini splits run pretty decent for a long time on 30% of it's charge left due to a bad flare.
❤🐺🐺🐺❤
If it is a goodman... Please, give it time before you take your reading. I've seen them take 15min to get stable and still settle after that.
Clark Deborah Martin Angela Hall Melissa
Williams Nancy Young Jason Johnson Scott
I can't stand this group of students. As an instructor for a different industry I can't stand when I ask a question & no one answers..... like the simple superheat chart questions....crickets...
And this is why women do not do this line of work. Last one in the room and even she booked it. Men--we are all on our own now.
What kind of brain defects….. been around refrigerant for over 30 years…. Never wore gloves
To wordy and trying to cram to much information into one session. You should stick to your subject line.
We’re just seeing a snippet of his full class, he has wonderful training. I have seen people use .5x speed to absorb and write notes though
In the United States? Explain yourself player. Not many countries have the forced air systems like here. Been following you for years but call it what it is bud. Air flow was not as big a factor or they didn't know as much about it as is now it's a big factor. They threw in duct work and that was that. Filters blower motors nowadays do not work well with duct work that was put in in the 60s or 70s.
This channel is in the US. Why just ask now if you follow Him for sometimes ❓❓❓. Every country is different Systems and how to do things
@@Honestandtruth007the way he said it was like he was implying something. Idk what but it was strange. He made sure he was heard the way he said. 🤔
Hello! Make this video in Spanish.
Hello! Use captions and auto translate to Spanish.
Why you never cover VRF systems...Don'g they exist in America!!!
From the UK and bought your book but never obtained information I have been longing for
Would you please do a video on how to carry out pressure leak test on a VRF system!!