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 TH-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.
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
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!).
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 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.
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.
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.
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.
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.
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.
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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.
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!!
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!
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.
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 🤘😎
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 🙏🏻
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.
If TXV is opening more when you put the bulb in hot water means TXV is working properly, and suction pressure will go high and superheat will go low. All those indication that you have a good TXV. Please prove me wrong if you can. Thank you
Heating the sensing bulb was a diagnostic step to confirm that the TXV has a restriction and is not operating properly under normal conditions. When you applied heat and the TXV opened, it showed that the valve was capable of functioning but was likely sticking or restricted in regular operation. This test helps confirm that the TXV is faulty and needs to be replaced, as the issue is likely intermittent or mechanical, causing it to restrict refrigerant flow under normal conditions. In short, heating the bulb provided a temporary fix for the restriction, but it verified that the TXV should be replaced for long-term system reliability.
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
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?
Time is valuable and instrumentation feedback is awesome. Therefore you should be using a modern gauge set that shows you your superheat subcool line temps all on the Fly of course that is also including pressures.
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?
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
Big fan of your channel thank you for sharing your knowledge with us. Sir if I can ask you a few questions. 1- can you use the same method to check a restriction on a filter dryer but with a txv to determine if there's a restriction on txv? If so what should it be the different of temperature from one point to the other on a good txv and bad txv? 2- is it possible that the indoor coil can be full of oil that can cause a restriction/ system going into a pump down? How can i verify this? Thank you.
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?
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.
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
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?
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!
Where there is blocked filter in evaporator side, or clogged evaporator would also cause insufficient supply of hot air. So,In that case it would mean the bulb is not sensing
Hey Craig Thanks for the video again Question if you don’t mind If the TXV had lost 100% of its charge it would still operate the same way in hot water? The suction pressure would be zero or extremely low if it was seized closed? If it was stuck open Then there would be too much liquid refrigerant and Very low superheat?
If TXV stuck In closed position your AC won't function at all because no freon going to your evaporator and low pressure cut out will open shutting off your compressor, if the TXV stuck open ( I have not seen one yet ) then your compressor would go bad real fast when you send liquid refrigerant and low superheat .
Usually the txv will not shut down all the way and will allow at least some refrigerant through but it may not be a lot. Everything else mentioned here you both are absolutely correct, thanks!
Looks like the system is low in charge, I wouldn’t condemn the TXV some TXV s need a little extra push. You were well below on all pressures. Great video though!
Not exactly sure what the ambient temperature is outside so a little hard to tell what the the liquid line pressures might be. In my case I would have added 1 pound of R-22 to see if both liquid line AND suction line pressures increased and if the subcool and superheat temperatures changed or remained the same. I know you do have to be careful about overcharging the system though.
You are correct Disenchanted. He was probably just a little low on charge. His head pressure was to low. He never gave the ambient temp. But guessing it was at least 70°-75° cause he’s running the ac and has a tshirt on. Grandpa’s rule for R22 systems 30° + ambient temp = high side sat temp. His sat temp was was low for ambient temps. Not to mention both high and low side was low. He proved his txv was working when he placed it in warm water. He was just low on charge.
TXV IS AN UPSELL SCAM THAT A LOCAL A C COMPANY USES IN LUFKIN COST ME $500.00 for A TXV FROM HUSTON, Tx. in 2015 THEIR NAME STARTS WITH Mc W RUN FROM THEM THEY UP SELL EVERY BODY
I try charging the system first,if both pressures goes up that means the system was low on charge. If the pressures doesn’t rise that means liquid line restriction then remove the txv bulb and place in the boiling water. Plz correct me if I am wrong
@@rpatty1973Heating the sensing bulb was a diagnostic step to confirm that the TXV has a restriction and is not operating properly under normal conditions. When you applied heat and the TXV opened, it showed that the valve was capable of functioning but was likely sticking or restricted in regular operation. This test helps confirm that the TXV is faulty and needs to be replaced, as the issue is likely intermittent or mechanical, causing it to restrict refrigerant flow under normal conditions. In short, heating the bulb provided a temporary fix for the restriction, but it verified that the TXV should be replaced for long-term system reliability.
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.
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!
Hey bud love your videos. Great job in explaining everything. I even bought your book. That’s was a gateway choice. But I can’t find where you bought the hilmor temperature clamps?
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
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?
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 .
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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 TH-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!
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
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
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.
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.
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!
Extraordinary videos. After eight moths into AC program i finally clarify this procedure, thanks to your video.
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!
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!
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.
Thanks man. You've helped me brush up on my skills in a major way. You're like an HVAC guru
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.
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.
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.
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.
Only hvac dude i really trust on TH-cam
Thank you for your support!
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!
I like your books etc. I like how you go through the pressures & temps in demos. Grest.
Thank you so much Rick!
-Do you have what it takes? Quizzes: www.acservicetech.com/quizzes
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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.
Best videos,,,,I just wished u used the digital gauges!!! But hands down your the best on utube...thank you sir!!
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!!
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
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.
Just had this issue today and was the shining tech when I mentioned your solutions
You have blessed my life and my families life. Thank you Mig
Wow that is really encouraging to hear!!!!
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!
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 🙏🏻
KEEP UP THE AMAZING WORK!!!!!!!!!!!!!
Thank you! Will do!
Thank you Craig this helps me a lot in HVAC/R school thank you for sharing your knowledge
Another great video. Excellent explanation. A great help to the hvac community. Thanks for sharing.
Glad to help Dean Martin!
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.
If TXV is opening more when you put the bulb in hot water means TXV is working properly, and suction pressure will go high and superheat will go low. All those indication that you have a good TXV. Please prove me wrong if you can. Thank you
Heating the sensing bulb was a diagnostic step to confirm that the TXV has a restriction and is not operating properly under normal conditions. When you applied heat and the TXV opened, it showed that the valve was capable of functioning but was likely sticking or restricted in regular operation.
This test helps confirm that the TXV is faulty and needs to be replaced, as the issue is likely intermittent or mechanical, causing it to restrict refrigerant flow under normal conditions.
In short, heating the bulb provided a temporary fix for the restriction, but it verified that the TXV should be replaced for long-term system reliability.
So informative makes me want to study the basics again
Thanks a lot Jeff!
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
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
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.
Great Video. For AC system has TXV which superheat temperature are good ? Thank you for sharing
I would love a video on trouble shooting with a fixed orifice. I always see videos with txv's.
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
Excellent demonstration good job.
Thank you very much!
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?
Time is valuable and instrumentation feedback is awesome. Therefore you should be using a modern gauge set that shows you your superheat subcool line temps all on the Fly of course that is also including pressures.
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?
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
Appreciated for all your effort and all the work you do !
Much appreciated!
Big fan of your channel thank you for sharing your knowledge with us. Sir if I can ask you a few questions.
1- can you use the same method to check a restriction on a filter dryer but with a txv to determine if there's a restriction on txv? If so what should it be the different of temperature from one point to the other on a good txv and bad txv?
2- is it possible that the indoor coil can be full of oil that can cause a restriction/ system going into a pump down? How can i verify this?
Thank you.
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?
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! 🙏
Excellent explanation and demonstration. Thanks for posting
Thanks a lot Johnmiller102!
Great video & demonstration Craig 👍
Glad you enjoyed it
Excellent video as always
Perfect explanation great video
Glad you liked it!
Extremely helpful video, thank you for this and all your other videos.
Glad it was helpful!
Very nice video.. how can I find the Hilmor toll I are using to check on temperature before and after the filter dryer
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
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?
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!
@acservicetech I’m a bit confused, what would a working TXV done in hot water?
You have a good book, I definitely have to buy it. Very good video.
Thank you for your support!!
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.
Can you do a video showing symptom on gauges when there is non-condensible in the system?
Where there is blocked filter in evaporator side, or clogged evaporator would also cause insufficient supply of hot air. So,In that case it would mean the bulb is not sensing
So I skimmed the books. I think if I was a owner I’d have ur book and ur quick trouble shooting cards in every truck mandatory.
Another great video, thanks for teaching clear and well explained
Glad it helped!!
Awesome 😎 very good explanation
Thank you!
It’s the boll or the txv the problem??
Do these concepts apply to refrigerator systems?
Hey Craig
Thanks for the video again
Question if you don’t mind
If the TXV had lost 100% of its charge it would still operate the same way in hot water? The suction pressure would be zero or extremely low if it was seized closed? If it was stuck open Then there would be too much liquid refrigerant and Very low superheat?
If TXV stuck In closed position your AC won't function at all because no freon going to your evaporator and low pressure cut out will open shutting off your compressor, if the TXV stuck open ( I have not seen one yet ) then your compressor would go bad real fast when you send liquid refrigerant and low superheat .
XRAY Bravo thanks friend
Usually the txv will not shut down all the way and will allow at least some refrigerant through but it may not be a lot. Everything else mentioned here you both are absolutely correct, thanks!
Looks like the system is low in charge, I wouldn’t condemn the TXV some TXV s need a little extra push. You were well below on all pressures. Great video though!
Not exactly sure what the ambient temperature is outside so a little hard to tell what the the liquid line pressures might be. In my case I would have added 1 pound of R-22 to see if both liquid line AND suction line pressures increased and if the subcool and superheat temperatures changed or remained the same. I know you do have to be careful about overcharging the system though.
You are correct Disenchanted. He was probably just a little low on charge. His head pressure was to low.
He never gave the ambient temp. But guessing it was at least 70°-75° cause he’s running the ac and has a tshirt on.
Grandpa’s rule for R22 systems 30° + ambient temp = high side sat temp.
His sat temp was was low for ambient temps. Not to mention both high and low side was low. He proved his txv was working when he placed it in warm water.
He was just low on charge.
TXV IS AN UPSELL SCAM THAT A LOCAL A C COMPANY USES IN LUFKIN COST ME $500.00 for A TXV FROM HUSTON, Tx. in 2015
THEIR NAME STARTS WITH
Mc W RUN FROM THEM THEY UP SELL EVERY BODY
I try charging the system first,if both pressures goes up that means the system was low on charge. If the pressures doesn’t rise that means liquid line restriction then remove the txv bulb and place in the boiling water. Plz correct me if I am wrong
@@rpatty1973Heating the sensing bulb was a diagnostic step to confirm that the TXV has a restriction and is not operating properly under normal conditions. When you applied heat and the TXV opened, it showed that the valve was capable of functioning but was likely sticking or restricted in regular operation.
This test helps confirm that the TXV is faulty and needs to be replaced, as the issue is likely intermittent or mechanical, causing it to restrict refrigerant flow under normal conditions.
In short, heating the bulb provided a temporary fix for the restriction, but it verified that the TXV should be replaced for long-term system reliability.
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.
Good video! Would like to see more!
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!
What is the strainer? And where is it located ?
Good explanation
Thanks for liking
@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?
So when the Bulb is sensing the hot water it allows less refrigerant to flow into the evaporator. so sensing bulb would be replaced?
Hey bud love your videos. Great job in explaining everything. I even bought your book. That’s was a gateway choice. But I can’t find where you bought the hilmor temperature clamps?
Hey whats the name of that tool that you used to check the temperature on both sides of the filter drier ?
Why did you not purge your hoses?
Question what kind of meter that you use
Superb explanation!
Glad you think so!
Great video
Thanks for the visit
Quick question, can the sense bulb be mounted vertically? My suction line is vertical.
Please make tutorial on suction line restriction
this was vital for me thank you
Thank you for your support!!
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
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.
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 .
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?
Excellent explanation, thanks
Thanks a lot Luis!
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..