I have bought all your materials and probably watched 200 hours of your videos. I’m retired and went and got my EPA 608 certification also. I’ve done 4 installs and helped getting ACs running again for friends and family thanks to you. I love videos like this one which helped me diagnose a problem for a friend. I think you have the best instructional videos of any trade on UA-cam. Thanks, Craig!
I never went to school for service work. I did go to sheet metal school for duct work for 4 years. I’m licensed to do hvac service work now. I’m learning a lot by watching your videos. Thank you for putting these up! I was taught incorrectly by charging by operating pressures only. Man was that guy wrong and wonder how many units he destroyed.
Ha ha yeah that seems to happen more than people like tom admit with charging with pressures only. The individuals doing that are taking shortcuts or just don't happen to know enough yet. I am sure they don't mean to do it!
isa sa mga video na lalo nag patibay sa akin sa larangan ng hvac madaling intindihin.ung iba bsta karga lng ng 60psi oky na di nila alm my procedure n cnusunod
You are simply the best instructor I have ever seen in my life. I cannot even begin to explain how you have changed my understanding of air conditioning. I have done installs and Chang outs my entire life over 30 years, but always counted on a service tech for start ups and serviving. Thanks to you I am on the road to not needing service texts anymore . Simply put your making my entire game complete. Thank you.
Outstanding! This is really useful stuff for techs to understand. One thing to keep filed in your technician craw that happened to me some years ago, is that Mfg make mistakes! In my case, I was going nuts on a job where I simply couldn’t make sense of my gauge readings and temps. Long story short: A brand new matched 3 ton system for R410a had a TXV factory installed for R-22. That’s right. R-22 TXV on a R410a system. I cannot tell you how much time I wasted by not questioning everything. Just know that the refrigerant pressure temp doesn’t lie. If you know you have a dry and tight system charged with a given refrigerant, and yet the pressures fail to measure up after weighing in the correct amount of gas, start to question whether you have the controls you think you have! As always, valuable lessons can only be learned in the field, but the more you hear the more you might save some real anguish (and time!).
Wanted to thank you Craig, had suspicions a call back I was going on was a liquid line restriction due to the pressures I saw last time but wasn't familiar with diagnosing it or what the signs were. I listened to your video on the way there and used those tips to properly diagnose what was indeed a liquid line restriction at that job so thanks again! Turns out the system was never installed with a filter drier and the evap coil itself may be clogged as well but at least the system isnt freezing up anymore.
This is a pretty good video. I was explaining this to my customer. After I left my customer, I decided to look up a video and this is exactly how I explained it to him.
I ran into the same issue today was doubtful of myself but after watching this I’m 100 percent confident that was indeed the issue I had 👍🏻🤜🏻 thank your Craig!
Super video. My ac has a problem and my superheat is very high and my subcooling is at around 9 degrees(ok for my Goodman 4 ton unit). With the info from your video I will attempt to check the filter dryer and the TXV to see where the restriction is(hopefully). Thank you all your video, they are so informative and clear. I really appreciate them and look at them anytime I have problems.
That gave me flash Back to 12 years old my dad showed and explained that to me exactly like that to. Every kid should learn a trade years before they enter high school
Great explanation on this sir. Txv failure is a very common call back and overcharge situation. Going to be ordering your book and cards in the near future to have on hand during my head scratcher/brain fart moments.
I have ordered stuff from you. I tell everyone about you. I have watched many in the past ten years! And you are the best sir!! I tell all my customers about your videos. You are doing all your videos the correct way!! Thank you for making my life easier!! Brian.
@@acservicetechchannel 21 years in the field running my hvac business. 5 star rating on Facebook. 65 plus reviews. yes I educate my customers very well. Sending to your videos for my educated balance. I have learned not so much in school did not teach me as your videos have made my life easier sir. And yes I educate my customers based on what I know and have gathered from your videos. Your number one on youtube, no else is even close. You have the gift sir! You have my respect and beyond!!
On rooftops check your economizer to make sure it’s functional. I had all the symptoms of a txv; tested with warm water. Ended up replacing it because it seemed bad. Turned out the economizer wasn’t functioning and the return air was getting too cold and with that bulb on the top part of the coil on the suction line it was getting frosty causing the suction pressure and saturation temp to go down. As soon as I manually cracked the economizer, it solved the issue.
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Sometimes a restricted strainer or filter drier will either sweat or freeze up and you can visually see this. This is caused because the restriction will actually induce a pressure loss in the refrigerant which causes it to begin to evaporate,
Thank you for what you are doing! You're making a difference out here. I personally don't like the bad name some of us techs get cuz there are far too many "hacks" just wingin-it.
Great video as always. But. When bleeding air out of your hoses, when you connect the suction and high side hose to the unit the hose connections should be slightly cracked at the manifold so as to force air out at the manifold and then tighten. Opening up the service line will be too late, the air has already mixed throughout the system as a homogeneous gas, not to mention the water vapor in the air mixes readily with hydroscopic poe oil that is suspended in the refrigerant. I used to use your method for years but I believe now that it isn't the best practice, especially on commercial units under contract that are constantly connected to. Thanks for another great video.
Another great how to video. Again, I am not a tech. but want to know what to look for when one of the rental houses have trouble. Thank you for all that you do Craig.
Refrigeration is not my career path. With that being said, problems with my residential AC has led me to this awesome source for refrigeration instructionals and troubleshooting. I have immersed myself in these videos and find the trade more fascinating than I could have ever imagined. You have a very special trainers gift that people of this trade are very lucky have such a powerful tool for their access. Thank you so much work developing I look forward to many great videos not yet viewed. And yes I was able to resolve my issue by watching your video. A million thanks!
Great vid as always Craig. Been following you for a couple years now and your content has gotten so much more detailed orientated and in 4K is a real treat. It is beyond awesome. I use the same digital temp reader too, I recommend! Any newcomers here, pay attention to what this man has to say and get that book! I did and it helps, a lottt. Thank you again and stay cool Craig 🤘😎
Good video !!!!! I have seen alot of ur videos which were great !! But we need one that explains how to tell when ur system has some air in it. How ur gages will respond to the air in it.
HI hopefully you and your family are safe and healthy. Great explanation to found bad TXV. I have one question, is the same prosses for package heat pump units? thanks in advance and have a great day.
Craig i bought both of your books, great videos im a refrigeration/hvac tech, i dont get how dunking the sensing bulb in hot water and seeing the superheat rise indicates a bad txv, the sensing bulb should force liquid into the evap lowering the superheat, but in the video, if I understood correctly, it showed the superheat rising, while i understand if the refrigerant is fed into the evap under higher loads we will see the superheat raise but didnt see the suction pressure increase much. Can you help me better understand the txv restriction?
I a new tech and just to let you know thank you for taking the time to explain well My the Lord Jesus Christ bless you and family and all your team Thank you 🙏🏻
Great explanation. I got a 410a txv unit where my liquid pressure is fluctuating 100psig. Why ? Possibly had leak seal in the past. Cooling good tho?? 17 degrees delta T
Hello, I’ve watched another one of your videos explaining a liquid line restriction and on the other video you put the txv bulb in cold ice water and in this video you put the the txv bulb in hot water. What is the difference?
Excuse me if I misunderstood you but the freon in the expansion valve bulb is the same type of freon (R22) in the system. It has to be to meter properly
So the txv did not fail mechanically in this case? or truly a restriction of a non-condensible or other foreign object? Dan foss had a great article where they were getting an abundance of returned txv's when truly the failure was a restriction or a failed sensing bulb, drier filter. Nothing with the txv; since all the txv does is one thing: the rate of flow of liquid refrigerant into the evaporator. What was the bottom line in this case?
what do they call the tool that you use at 7:22 , the one that you tested on both side of the filter dryer ? can i buy it at amazon ? thank you very much .
great book by the way. ok, the txv is opening up when submerged in hot water. so it's actually doing its job. am i missing something here? please help to clarify. thank you.
mark.r hvac I thought the same! I think he said that the refrigerant inside the bulb was low in charge, so its not work properly. I thinks the problem was in the actuator its self, that TXV looks really old. I got the same problems in a walk-in cooler, it took me weeks to solve and find the problem, actually, I called my Dad who have 50 years of experience and he told me to change the TXV. Now with this video i can figure it out more easy next time!
Mark and Marcio, so the TXV will not apply the correct pressure which would be opening force because the bulb is low on refrigerant. However, I often find that the bulb is low on refrigerant and not empty so if I submerge it in hot water, the pressure is higher even with the smaller amount of refrigerant inside the bulb. If I see the txv allow more refrigerant into the evap by noticing the higher vapor pressure then I know the TXV is at fault, thanks!
AC Service Tech LLC If the screen was the problem, there wouldn’t be a change wether the bulb is good or bad, the pressure on low side would still be low?
great demonstration. but by putting txv bulb in 102f water the txv valve opens up more and the low side pressure and saturation temp increase. so this means the txv is doing its job right? beacause at 67f txv opens a little and at 102f it opens up more. please help as i am a little confused. thanks.
I was wondering this too but then there's the fact it was at close to good operating temp with the bulb being in hot water. I believe if the TXV was good the pressures either wouldn't have changed due to a clog somewhere else or the low side would be way higher then where they should be as the TXV would be opened all the way from warm water rather then only as much as it was supposed to when it's on the cold liquid line. If that makes sense. I'm not even sure I'm right on that but that's what I'm thinking
Hi there great video Sir. I have a question. You connected your gauge hoses and the yellow hose you bled the air out till just a small amount of refrigerat come out? Is that because of the pressure that the system has inside? Thank you in advance for your reply.
Chucky Alone I will answer that .Yes that was the pressure from the system.Remember atmospheric pressure is 14.7 psi and high pressure ,high temperature always naturally moves to a low pressure low temperature area.Yes he used the refrigerants standing pressure to purge all the air out of his line set,very important that this is done.Now the system was off when he purged.
@@robertcherry4971 thank you so much for the reply. I have another question... would it be good idea to vacuum the hose lines in the gauges next time in case my AC unit has not that much refrigerant, and prevent the air inside the hoses from going inside the AC system?
Chucky, the positive pressure inside the system however small will not allow air into the system unless it is severely empty and running in vacuum. If you work on low temp chillers, those run in vacuum on the low side as well but these small residential systems run with positive pressure, thanks!
@@acservicetechchannel thank you so much Sir, for clarifying that I had that in my mind but I wasn't sure. Sir. My instructor says you have awesome video's and I should follow up on your videos for better clarification on hands on...since our community college is closed we can't do hands on...but watching your videos is like doing it while holding my hand. Thank you for the reply, clarification and awesome tips and knowledge.
Amazing demonstration, soon I’ll buy your book! But I have a question as a noob in the trade would you recommend the paper edition or the digital edition!
I got BOTH versions. If I forget my book, I can easily reference it on my phone in digital format. If I get bored on vacation, I can easily reference the digital version on my phone. Many advantages to buying both versions.
There is a little stainless steel screen right before the metering device and sometimes there is another right after the metering device so that may get clogged, thanks!
I miss diagnosed a txv restriction today for a low charge issue apparently. System read low pressures with a high subcooling about 20 degrees I believe on a target 10 degree system. Any thoughts on how where I could have gone wrong? Anything hells thanks. Also some contexts I believe it was 14 seer bryant. 410a txv system. Lowside was 10 degrees sat temp and highside was about 108 sat. 80 indoor 100 outdoor temp
So I have a 5 ton rooftop unit that has 65 psi suction pressure and liquid 210psi and liquid temp at 165 degrees,,,, I washed the condenser coil with no change in temp????
hi, so for this example the suction line temp. and the hot water in glass temp. must be 102f for the txv to open up more? because at 67f the txv did not open enough to get 10 to 14 degrees of superheat.
Do you recommend adjusting the TXV by front seating or back seating before replacing it ? Also I have senior tech he said whenever txv is not working based on factory to go ahead replace it because its not working, and the should not be adjusted in his opinion, If you can explain this. Thank you.
Usually, the txv is factory set correctly for ac mode because the TXV's are made specifically for ac units. The only time we really adjust them is if someone incorrectly adjusted them out of specs. Most ac unit txv's can't be adjusted anyway. Before playing with adjustments, you would like to know if someone was playing with it. The problem with adjusting is the time investment and if it doesn't work out, it is a lot of wasted time for the end result. That is prob why that senior tech is telling you this, thanks!
Thank God for videos like your on you tube. I especially learned a lot from the freezing coil video as well. My coil was freezing up as if the line had a restriction. A tech came today and checked the coil and it was actually clean as the filter which I recently changed. It was low 1.5 pounds low on r22 Freon but I was/ am concerned on how did it leak out when 1 month ago the levels read fine. He checked all over w a solution inside/ outside and couldn’t locate anything. I just filled it w 1.5 lbs of Freon and she’s running ok now. Just hope it doesn’t leak out since we didn’t find the leak and it doesn’t freeze up. Any advice?
I still don’t understand the confirmation part where he says it’s bad, I would expect my superheat to lower with more pressure on the bulb, as well as suction pressure because I’m letting more refrigerant in. I would also expect my sub cooling to lower as well? How does this confirm that it’s bad??
What would the results be if the TXV was working properly? Shouldn’t the TXV open when you put the bulb in hot water and allow more refrigerant as it did in your video? It seems as though the TXV is working properly, I am confused!
This was somewhat useful but in my realword. I have 4-6 service calls and taking that txv out of the coil or hunting down hot water may not be practice. I wonder if there are other ways to recognize a faulty txv. what are the reasons of contamination like air or moisture? poor vacuuation practice? any others?
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AC Service Tech LLC I just ordered your book bundle from your website. Can’t wait to get my grubby little hands on those! Ha ha
Hi there is there a promo code I could use.?
I purchased the hard back copy . What a great purchase and investment 💯💯🎯. Thanks for sharing ur materials.
instablaster
I have bought all your materials and probably watched 200 hours of your videos. I’m retired and went and got my EPA 608 certification also. I’ve done 4 installs and helped getting ACs running again for friends and family thanks to you. I love videos like this one which helped me diagnose a problem for a friend. I think you have the best instructional videos of any trade on UA-cam. Thanks, Craig!
I totally agree. I’m retired and basically followed the same course of action. I also thank Craig.
💯💯💯👍👍
I never went to school for service work. I did go to sheet metal school for duct work for 4 years. I’m licensed to do hvac service work now. I’m learning a lot by watching your videos. Thank you for putting these up! I was taught incorrectly by charging by operating pressures only. Man was that guy wrong and wonder how many units he destroyed.
Ha ha yeah that seems to happen more than people like tom admit with charging with pressures only. The individuals doing that are taking shortcuts or just don't happen to know enough yet. I am sure they don't mean to do it!
isa sa mga video na lalo nag patibay sa akin sa larangan ng hvac madaling intindihin.ung iba bsta karga lng ng 60psi oky na di nila alm my procedure n cnusunod
kaya nga bumili tlga ako ng book ni ac service tech dhil dto ko lng nkita un linaw na turo na di tinuturo ng ibang tvet school
You are simply the best instructor I have ever seen in my life. I cannot even begin to explain how you have changed my understanding of air conditioning. I have done installs and Chang outs my entire life over 30 years, but always counted on a service tech for start ups and serviving. Thanks to you I am on the road to not needing service texts anymore . Simply put your making my entire game complete. Thank you.
John, that is so encouraging to hear! I really appreciate you taking the time to write this note!
Ur tight with money
Love your content. It never gets old. Repetitive info is how we learn!
Absolutely!
Outstanding! This is really useful stuff for techs to understand. One thing to keep filed in your technician craw that happened to me some years ago, is that Mfg make mistakes! In my case, I was going nuts on a job where I simply couldn’t make sense of my gauge readings and temps. Long story short: A brand new matched 3 ton system for R410a had a TXV factory installed for R-22. That’s right. R-22 TXV on a R410a system. I cannot tell you how much time I wasted by not questioning everything. Just know that the refrigerant pressure temp doesn’t lie. If you know you have a dry and tight system charged with a given refrigerant, and yet the pressures fail to measure up after weighing in the correct amount of gas, start to question whether you have the controls you think you have! As always, valuable lessons can only be learned in the field, but the more you hear the more you might save some real anguish (and time!).
Kenny Manchester Good tip
I'd be sending them my bill
Thats happened to me twice before. Both times an enormous amount of time was spent troubleshooting before I finally found the problem.
Wanted to thank you Craig, had suspicions a call back I was going on was a liquid line restriction due to the pressures I saw last time but wasn't familiar with diagnosing it or what the signs were. I listened to your video on the way there and used those tips to properly diagnose what was indeed a liquid line restriction at that job so thanks again! Turns out the system was never installed with a filter drier and the evap coil itself may be clogged as well but at least the system isnt freezing up anymore.
Thanks a lot!
@@acservicetechchannel no thank YOU.
I like the fact you said that all 3 components would need to be replaced. This simplifys the job for newbies and reduces the complexities.
But do I have to do all three.😢 it's a brand new unit I don't get it
Extraordinary videos. After eight moths into AC program i finally clarify this procedure, thanks to your video.
This is a pretty good video. I was explaining this to my customer. After I left my customer, I decided to look up a video and this is exactly how I explained it to him.
I ran into the same issue today was doubtful of myself but after watching this I’m 100 percent confident that was indeed the issue I had 👍🏻🤜🏻 thank your Craig!
Great demonstration,excellent explanation.Thank you sharing your knowledge with others so freely.Your are a good man sir.
I am very glad to help and thank you Robert!
Super video. My ac has a problem and my superheat is very high and my subcooling is at around 9 degrees(ok for my Goodman 4 ton unit). With the info from your video I will attempt to check the filter dryer and the TXV to see where the restriction is(hopefully). Thank you all your video, they are so informative and clear. I really appreciate them and look at them anytime I have problems.
That gave me flash Back to 12 years old my dad showed and explained that to me exactly like that to. Every kid should learn a trade years before they enter high school
Great explanation on this sir. Txv failure is a very common call back and overcharge situation. Going to be ordering your book and cards in the near future to have on hand during my head scratcher/brain fart moments.
I have ordered stuff from you. I tell everyone about you. I have watched many in the past ten years! And you are the best sir!! I tell all my customers about your videos. You are doing all your videos the correct way!! Thank you for making my life easier!! Brian.
Brian, thank you very much! Who are your customers? Are you an HVACR Educator too? Thanks!
@@acservicetechchannel 21 years in the field running my hvac business. 5 star rating on Facebook. 65 plus reviews. yes I educate my customers very well. Sending to your videos for my educated balance. I have learned not so much in school did not teach me as your videos have made my life easier sir. And yes I educate my customers based on what I know and have gathered from your videos. Your number one on youtube, no else is even close. You have the gift sir! You have my respect and beyond!!
As a product trainer for a major brand I would just like to tank you for your great videos and on point training. Excellent job sir!
Thank you so much! That means a lot!
Thank you for your service to mr. Cool!
On rooftops check your economizer to make sure it’s functional. I had all the symptoms of a txv; tested with warm water. Ended up replacing it because it seemed bad. Turned out the economizer wasn’t functioning and the return air was getting too cold and with that bulb on the top part of the coil on the suction line it was getting frosty causing the suction pressure and saturation temp to go down. As soon as I manually cracked the economizer, it solved the issue.
Thanks man. You've helped me brush up on my skills in a major way. You're like an HVAC guru
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I like your books etc. I like how you go through the pressures & temps in demos. Grest.
Thank you so much Rick!
You're overflowing with knowledge and appreciate you sharing it!
Danny, so glad it helps!
Sometimes a restricted strainer or filter drier will either sweat or freeze up and you can visually see this. This is caused because the restriction will actually induce a pressure loss in the refrigerant which causes it to begin to evaporate,
Yes the humidity will freeze right after the restriction, thanks!
Thank you for what you are doing! You're making a difference out here. I personally don't like the bad name some of us techs get cuz there are far too many "hacks" just wingin-it.
Absolutely, thanks Blinkers!
Great video as always.
But. When bleeding air out of your hoses, when you connect the suction and high side hose to the unit the hose connections should be slightly cracked at the manifold so as to force air out at the manifold and then tighten. Opening up the service line will be too late, the air has already mixed throughout the system as a homogeneous gas, not to mention the water vapor in the air mixes readily with hydroscopic poe oil that is suspended in the refrigerant. I used to use your method for years but I believe now that it isn't the best practice, especially on commercial units under contract that are constantly connected to. Thanks for another great video.
Best videos,,,,I just wished u used the digital gauges!!! But hands down your the best on utube...thank you sir!!
Another great how to video. Again, I am not a tech. but want to know what to look for when one of the rental houses have trouble. Thank you for all that you do Craig.
Only hvac dude i really trust on UA-cam
Thank you for your support!
Refrigeration is not my career path. With that being said, problems with my residential AC has led me to this awesome source for refrigeration instructionals and troubleshooting. I have immersed myself in these videos and find the trade more fascinating than I could have ever imagined. You have a very special trainers gift that people of this trade are very lucky have such a powerful tool for their access. Thank you so much work developing I look forward to many great videos not yet viewed. And yes I was able to resolve my issue by watching your video. A million thanks!
I did buy all the books and studying for better understanding. I really like your videos as well
Great vid as always Craig. Been following you for a couple years now and your content has gotten so much more detailed orientated and in 4K is a real treat. It is beyond awesome. I use the same digital temp reader too, I recommend! Any newcomers here, pay attention to what this man has to say and get that book! I did and it helps, a lottt. Thank you again and stay cool Craig 🤘😎
Thank you very much Dom for taking the time to write this note!
Just had this issue today and was the shining tech when I mentioned your solutions
Craig, gotta conquer w/everyone ~ u r a Phenomenal instructor! Keep on Truck’n!
Good video !!!!! I have seen alot of ur videos which were great !! But we need one that explains how to tell when ur system has some air in it. How ur gages will respond to the air in it.
KEEP UP THE AMAZING WORK!!!!!!!!!!!!!
Thank you! Will do!
Long time fan. Appreciate the info. I had to go back to basic, Walk in coolers are tricking me. Just wanted to say you look like Tony Hawk. lol
Another great video. Excellent explanation. A great help to the hvac community. Thanks for sharing.
Glad to help Dean Martin!
You have blessed my life and my families life. Thank you Mig
Wow that is really encouraging to hear!!!!
Thank you for the explanation great video my question is I’ve been told the bulb she be placed on the outside on the suction line insulated
Thank you Craig this helps me a lot in HVAC/R school thank you for sharing your knowledge
Thanks a lot for all your videos.
I’m learning more now. I have your A/C book.
Awesome, thank you!
AC Service Tech LLC I was studying the superheat method this morning. With your video and book at the same time.
HI hopefully you and your family are safe and healthy.
Great explanation to found bad TXV.
I have one question, is the same prosses for package heat pump units?
thanks in advance and have a great day.
Craig i bought both of your books, great videos im a refrigeration/hvac tech, i dont get how dunking the sensing bulb in hot water and seeing the superheat rise indicates a bad txv, the sensing bulb should force liquid into the evap lowering the superheat, but in the video, if I understood correctly, it showed the superheat rising, while i understand if the refrigerant is fed into the evap under higher loads we will see the superheat raise but didnt see the suction pressure increase much. Can you help me better understand the txv restriction?
So informative makes me want to study the basics again
Thanks a lot Jeff!
Excellent demonstration good job.
Thank you very much!
I a new tech and just to let you know thank you for taking the time to explain well
My the Lord Jesus Christ bless you and family and all your team
Thank you 🙏🏻
Thank you for watching, it can be rough in the field so I'm glad you have been able to learn from my videos. God bless you as well 🙏🏻
Great explanation. I got a 410a txv unit where my liquid pressure is fluctuating 100psig. Why ? Possibly had leak seal in the past. Cooling good tho?? 17 degrees delta T
Very nice video.. how can I find the Hilmor toll I are using to check on temperature before and after the filter dryer
Appreciated for all your effort and all the work you do !
Much appreciated!
Excellent video as always
Hello, I’ve watched another one of your videos explaining a liquid line restriction and on the other video you put the txv bulb in cold ice water and in this video you put the the txv bulb in hot water. What is the difference?
Love the video. One question though. Is the dryer put in wrong. I noticed it isn't a bi-flow and see the arrow pointing away from the indoor unit.
Nevermind. I looked at the video again. I see now that it's a horizontal unit and the dryer arrow is going in the right direction. Sorry.
Excuse me if I misunderstood you but the freon in the expansion valve bulb is the same type of freon (R22) in the system. It has to be to meter properly
It can b a diff refrigerant
Great video & demonstration Craig 👍
Glad you enjoyed it
Awesome 😎 very good explanation
Thank you!
Perfect explanation great video
Glad you liked it!
Can you do a video showing symptom on gauges when there is non-condensible in the system?
So the txv did not fail mechanically in this case? or truly a restriction of a non-condensible or other foreign object? Dan foss had a great article where they were getting an abundance of returned txv's when truly the failure was a restriction or a failed sensing bulb, drier filter. Nothing with the txv; since all the txv does is one thing: the rate of flow of liquid refrigerant into the evaporator. What was the bottom line in this case?
Great Video. For AC system has TXV which superheat temperature are good ? Thank you for sharing
Extremely helpful video, thank you for this and all your other videos.
Glad it was helpful!
So when the Bulb is sensing the hot water it allows less refrigerant to flow into the evaporator. so sensing bulb would be replaced?
what do they call the tool that you use at 7:22 , the one that you tested on both side of the filter dryer ? can i buy it at amazon ? thank you very much .
@acservicetechchannel so if I have high SH and normal SC does that mean I may have a restriction, or only if my SC is high as well?
Excellent explanation and demonstration. Thanks for posting
Thanks a lot Johnmiller102!
You have a good book, I definitely have to buy it. Very good video.
Thank you for your support!!
Quick question, can the sense bulb be mounted vertically? My suction line is vertical.
Good video! Would like to see more!
Good day ser what happen to a/c
410a freon with 120psi low side 500psi high side and there is no return or cold in suction line..
great book by the way. ok, the txv is opening up when submerged in hot water. so it's actually doing its job. am i missing something here? please help to clarify. thank you.
mark.r hvac I thought the same! I think he said that the refrigerant inside the bulb was low in charge, so its not work properly. I thinks the problem was in the actuator its self, that TXV looks really old. I got the same problems in a walk-in cooler, it took me weeks to solve and find the problem, actually, I called my Dad who have 50 years of experience and he told me to change the TXV. Now with this video i can figure it out more easy next time!
Mark and Marcio, so the TXV will not apply the correct pressure which would be opening force because the bulb is low on refrigerant. However, I often find that the bulb is low on refrigerant and not empty so if I submerge it in hot water, the pressure is higher even with the smaller amount of refrigerant inside the bulb. If I see the txv allow more refrigerant into the evap by noticing the higher vapor pressure then I know the TXV is at fault, thanks!
AC Service Tech LLC
If the screen was the problem, there wouldn’t be a change wether the bulb is good or bad, the pressure on low side would still be low?
i would have thought that evap coil
was restricted. undo blower and see where in freezes.
Hi sir. , Can we use infrared temperature gun for measure liner temperature for calculate SH &SUB COOL
great demonstration. but by putting txv bulb in 102f water the txv valve opens up more and the low side pressure and saturation temp increase. so this means the txv is doing its job right? beacause at 67f txv opens a little and at 102f it opens up more. please help as i am a little confused. thanks.
I was wondering this too but then there's the fact it was at close to good operating temp with the bulb being in hot water. I believe if the TXV was good the pressures either wouldn't have changed due to a clog somewhere else or the low side would be way higher then where they should be as the TXV would be opened all the way from warm water rather then only as much as it was supposed to when it's on the cold liquid line. If that makes sense. I'm not even sure I'm right on that but that's what I'm thinking
So if it wasn’t the txv and it was the strainer or the filter drier the super heat and pressure wouldn’t change?
How can I get the book and the chart good information thanks bro
They are available at www.acservicetech.com and on www.amazon.com/shop/acservicetech thanks!
@acservicetech I’m a bit confused, what would a working TXV done in hot water?
I'm confused. I always thought that if you warmed up bulb or put it in ice water and it responded properly that the txv is good.
I would love a video on trouble shooting with a fixed orifice. I always see videos with txv's.
Great video
Thanks for the visit
Hey whats the name of that tool that you used to check the temperature on both sides of the filter drier ?
Question what kind of meter that you use
Hi there great video Sir. I have a question. You connected your gauge hoses and the yellow hose you bled the air out till just a small amount of refrigerat come out? Is that because of the pressure that the system has inside? Thank you in advance for your reply.
Chucky Alone I will answer that .Yes that was the pressure from the system.Remember atmospheric pressure is 14.7 psi and high pressure ,high temperature always naturally moves to a low pressure low temperature area.Yes he used the refrigerants standing pressure to purge all the air out of his line set,very important that this is done.Now the system was off when he purged.
@@robertcherry4971 thank you so much for the reply. I have another question... would it be good idea to vacuum the hose lines in the gauges next time in case my AC unit has not that much refrigerant, and prevent the air inside the hoses from going inside the AC system?
Chucky, the positive pressure inside the system however small will not allow air into the system unless it is severely empty and running in vacuum. If you work on low temp chillers, those run in vacuum on the low side as well but these small residential systems run with positive pressure, thanks!
@@acservicetechchannel thank you so much Sir, for clarifying that I had that in my mind but I wasn't sure. Sir. My instructor says you have awesome video's and I should follow up on your videos for better clarification on hands on...since our community college is closed we can't do hands on...but watching your videos is like doing it while holding my hand. Thank you for the reply, clarification and awesome tips and knowledge.
Another great video, thanks for teaching clear and well explained
Glad it helped!!
Good explanation
Thanks for liking
Amazing demonstration, soon I’ll buy your book! But I have a question as a noob in the trade would you recommend the paper edition or the digital edition!
Adonis Portillo both
I have got the print edition and that is the best. Get a break from all the technology in your life and read a book!
I got BOTH versions. If I forget my book, I can easily reference it on my phone in digital format. If I get bored on vacation, I can easily reference the digital version on my phone. Many advantages to buying both versions.
Thanks guys! 🙏
If all the refrigerant from the bulb had leaked out, the superheat would not go down when the bulb was placed in hot water correct?
Awesome video!
Thanks for the visit
I love your videos,I have a question when you said restriction on the “screener” what is that,thanks for the answer.
There is a little stainless steel screen right before the metering device and sometimes there is another right after the metering device so that may get clogged, thanks!
AC Service Tech LLC thanks a lot for the answer and for taking your time to respond appreciate,blessings
Strainer, is the word
Sight glass
So if superheat drops and vapor saturation rises and then the subcooling goes down.. is the txv bad?
this was vital for me thank you
Thank you for your support!!
Is it necessary to use a flashback arrestor when using an acetylene tank only, not oxy-acetylene?
Do these concepts apply to refrigerator systems?
I miss diagnosed a txv restriction today for a low charge issue apparently. System read low pressures with a high subcooling about 20 degrees I believe on a target 10 degree system. Any thoughts on how where I could have gone wrong? Anything hells thanks.
Also some contexts I believe it was 14 seer bryant. 410a txv system. Lowside was 10 degrees sat temp and highside was about 108 sat. 80 indoor 100 outdoor temp
So I have a 5 ton rooftop unit that has 65 psi suction pressure and liquid 210psi and liquid temp at 165 degrees,,,, I washed the condenser coil with no change in temp????
Superb explanation!
Glad you think so!
hi, so for this example the suction line temp. and the hot water in glass temp. must be 102f for the txv to open up more? because at 67f the txv did not open enough to get 10 to 14 degrees of superheat.
Do you recommend adjusting the TXV by front seating or back seating before replacing it ?
Also I have senior tech he said whenever txv is not working based on factory to go ahead replace it because its not working, and the should not be adjusted in his opinion, If you can explain this.
Thank you.
Usually, the txv is factory set correctly for ac mode because the TXV's are made specifically for ac units. The only time we really adjust them is if someone incorrectly adjusted them out of specs. Most ac unit txv's can't be adjusted anyway. Before playing with adjustments, you would like to know if someone was playing with it. The problem with adjusting is the time investment and if it doesn't work out, it is a lot of wasted time for the end result. That is prob why that senior tech is telling you this, thanks!
Thank God for videos like your on you tube. I especially learned a lot from the freezing coil video as well. My coil was freezing up as if the line had a restriction. A tech came today and checked the coil and it was actually clean as the filter which I recently changed. It was low 1.5 pounds low on r22 Freon but I was/ am concerned on how did it leak out when 1 month ago the levels read fine. He checked all over w a solution inside/ outside and couldn’t locate anything. I just filled it w 1.5 lbs of Freon and she’s running ok now. Just hope it doesn’t leak out since we didn’t find the leak and it doesn’t freeze up. Any advice?
I still don’t understand the confirmation part where he says it’s bad, I would expect my superheat to lower with more pressure on the bulb, as well as suction pressure because I’m letting more refrigerant in. I would also expect my sub cooling to lower as well? How does this confirm that it’s bad??
What would the results be if the TXV was working properly? Shouldn’t the TXV open when you put the bulb in hot water and allow more refrigerant as it did in your video? It seems as though the TXV is working properly, I am confused!
This was somewhat useful but in my realword. I have 4-6 service calls and taking that txv out of the coil or hunting down hot water may not be practice. I wonder if there are other ways to recognize a faulty txv. what are the reasons of contamination like air or moisture? poor vacuuation practice? any others?
Please teach about cool weather txv issues