HVAC 090 TXV a deeper view of the Thermostatic Expansion Valve TEX TXV
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- Опубліковано 3 сер 2021
- Warning there is audio issues with this video I was unable to correct.
This video we take a deeper look at TXV TEV If your new to TXV TEV start with HVAC 060 introduction to TXV • HVAC 060 Introduction ... to to HVAC 065
Here we cut a few open take a peak at why the fail introduce check valves, compare adjustable to non adjustable and compare commercial to residential.
There is still so much more information that is left out of this video. Later I will make one with different failues and how they would respond but I am a ways away from the diagnostics portion.
Below is a list of resources to help cover the details I left out and other view points and ways of explaining the TXV and more.
2 of my favorite people in HVAC talk about so many great points right there!
• What a TXV Does (and w...
Here is a ton of great resources (as always) for TXV at @HVACS school website
hvacrschool.com/tag/txv/
Craig with @acservicetechchannel is just awesome at everything he does, another great example here with excellent animations
• (TXV) Thermostatic Exp...
@EngineeringMindset has a nice video on TXV operation
• How TXV works - Thermo...
Engineering mindset this video is great! has animation
• What's inside a Therma...
Chris with @HVACRVIDEOS is awesome with commercial, here is a video replacing TXV TEX
• WALK IN FREEZER TEV RE...
he also has a great video on the sporlan TXV build kit! these are so great for refrigeration.
• SPORLAN BQ TEV KIT
Don Gillis with Emerson speaks about TXV here • HVACR Fundamentals | H...
S@sporlanvideo video on adjusting TXV
• How to Adjust Thermost...
Sporlan Video on operation
• Thermostatic Expansion...
Sporlan video on distributors
• Refrigerant Distributo...
D@DanfossClimate manufacturing Has a great animation here
• How a TE 12 thermostat...
Danfoss more information
www.danfoss.com/en-us/service...
The News articles on TXV
www.achrnews.com/articles/131...
27+ - years in & learned an Lot as always ......Thanks Ty
Ty, you are one of the best hvac teachers on the internet. Thank u for the effort you are putting on to make this awesome videos.
Thank you. There are many better than I bit I do appreciate your complement.
How are you able to explain so fluently and effectively?!!! Blows my mind many times!
Man,this is the greatest video explanation for txv,thanks for sharing you knowledge.
I concur. with the last comment before mine, this guy is a badass... Best TXV valve explanation bar none, thanks a lot keep the videos coming.
Obviously you are much better than my hvac teacher
Bro I am knew to your channel your videos are very short well explained and not boring thanks for the information hope you keep up the good work, I really appreciate your videos being a junior tech its really hard to get the finance to take those expensive courses when you work pay check to pay check
It doe get better than Ty. His ability to diagnosis is exceptional. His delivery is kind, thoughtful, and chock full of experience. raphael nyc
Thanks Raphael! I have some really good friends in NYC, I can't wait to return and visit!
Really like your explanation style.
I’ve always called that stuff mastic, and I agree it’s a mess. Especially in the summer lol. Great video!
Really nice video. Thank you very much.
Very good...👌👌Thanks🙏🏼❤️💜❣️
Great video, Ty! I wouldn’t have thought about the dissimilar metal issue but it makes perfect sense. Another thing that I find puzzling is why manufacturers even use copper brazing as opposed to using flare fittings. I can imagine brazed connections being somewhat more reliable but if flare connections aren’t reliable then why are they used at all? In a similar vein, it would seem sensible for valve manufacturers to increase the length of the piping to where brazed connections are made to help protect against the valve being damaged by overheating. Anyway, thanks for another highly informative video. - Best - Jim
You bring up great points.
I think it comes down to cost. It cost more for the brass flared fittings and more manufacturing requirements to make those in the factory.
Shorter tubes for the same reason.
.10 over 100,000 units is nice bonus for someone. Thays my opinion anyway.
no in all my years. ive changed quite a few. but maybe only a handful were truly bad. others were damaged due to poor service, burnouts, trash in system, screens clogged. they really dont go bad that often unless service incorrectly. i love staybrite 8 and love it. use it myself but there are people out there that use too much solder or flux or both
The equalization line, besides providing the valve with the saturation temp via the pressure, also bleeds off the liquid line pressurized refrigerant that will inherently leak around the valve shaft into the chamber below the powerhead.
Carrer installed some TXVs upside down and the same area below the power head would fill with oil.
Braze !
Braze !
Braze !
I know people get away with soft solder but the way I was taught, "Braze"
Speed kills.
Wait until the o-ring boys crap starts to fail !
I really appreciate the time and effort you put in to your videos!
🍇😎👍🏻
🥃🥃🍺🍺🍺🍿🏌🏻♀️
Stay safe.
Retired (werk'n)keyboard super tech. Wear your safety glasses.
👍exelent
I learned something new today about the position of the two tube sticking out of the Sensing bulb either I forgot I learned long ago and faded out a memory or didn’t pay attention closely enough to the readings or instructions for my father as a child.
Doesn’t matter how many decades you’ve done something if you haven’t learned something new every day you’re not doing something right.
Got a love those guys who swear by StayBright 8. And because they’ve been doing something for decades usually ( that makes it right) find that there are stubborn as a log and deny they caused any harm. Even if you show them. Deeply ingrained cult religion following.
Some ppl can use it correctly and not have problems. So those ppl are not wrong. It's if you did not learn how to make it work is when there is a problem. So it appears depending on situation you and them are right. When done right they are right.
@@hhenrynice6843 you are correct 👍. I did come across one Job were 8 spit systems installed with StayBright 8 . I was the nicest install system I have ever seen on the Brazing job , none leaked. But 4 out of 8 leaked at the flair fittings.
That was the first time I ever gave a StayBright 8 job a thumbs up 👍 in one of my videos on a R410 system.
You are wonderful teacher Ty, if the sensing bulb got leak how we know that? Thanks.
High superheat that you cannot adjust.
it will give you the same symptoms as a a restriction
Record Superheat, take the bulb and put it in ice water record the Superheat then heat the bulb up in your hand warning it up and record superheat. if the superheat never changed you may have a leak in the sensing bulb but a restriction clogged strainer can give you the same symptoms.
Wow, what an awesome video and channel. I wish I could hire you to service my heat pump in AZ! In order to test TXV using superheat method, must the system be properly filled? I had a tech tell me my lack of cooling is most likely due to TXV but can't be certain. Now I'm researching how to diagnose faulty TXV. The subcooling was only 1 degree when it should be 10 degrees on my heat pump. The tech supposedly added 2lbs of R410A. That only gained another 1 degree of subcooling so now has 2 degrees. He didn't feel comfortable adding additional refrigerant. I'm worried that not enough liquid is getting to the TXV if my charge is super low. I cleaned my condenser coil the best I could, silly trane spines. Other than low refrigerant, what other things should I look for that causes low subcooling? When the system initially runs after a period of rest, the suction vapor line is nice and cold, "beer can cold" at the evaporator, then it becomes closer to ambient temp after 5-10 seconds. Could that be a sign of restriction or low charge?
I believe pin was installed upside down. Refrigerant couldn't flow the way it was in there during description.
Wow. Who uses soft solder!! 🤦🏻♂️🤦🏻♂️
Good video 🔥
I see it all the time. Ugh
Any experience with AC Renew? I’ve heard it’s a product that helps with older systems and can weaken trace acids.
A compressor manufacturer a while back had an issue with a rust inhibitor that reacted with POE oil and it gummed up TXV's and AC renew was the only thing that seemed to help that.
As far as acid goes, I'm not a chemist but the one I talked to had a lang explanation that essentially said what ever gets rid of acid either is a base and must me chemically balanced in quantity ot it will turn back to water that will turn back to an acid. I do not have anything in writing to back that up so do your own research.
I had 2 commercial systems that had noisy compressors but where running good. I added ac renew and they were still noisy and died 6 months later. I don't think the AC renew caused the failure but it certainly did not help with anything.
Manufacturers spend so much money marketing their products it makes it impossible to find the truth.
Long story short I would use it for the specific issue of oil additives where the manufacture suggested it but I would not spend the money behind that.
👏👏👏👏🙏🙏
👏👏👏👏✅
In electronics soldering, they sometimes use a non-corrosive flux. I think kester makes a pen. Would that work for soldering pipe to prevent corrosion failure maybe?
I do not know.
I have yet to see any manufacture of residential or commercial equipment use soft solder from the factory as they are always braze (silversoldered) . The manufactures spend a lot of time testing a variety of methods. I think, if soft solder was a viable option at least 1 manufacture would be using it.
I think instead of improving a inferior method to make it slightly better we could just braze it properly with an inert gas and never have to worry about it again. I would rather see the fast push on connection as they would at least be easier to fix. Fixing soft solder connection is one of the things I despise doing.
@@love2hvac sorry. I like to solve problems with things. Also youtubers in general have trained viewers that comments feed the algorithm. "Here algorithm have a cookie" isn't a very well thought out comment, so I try to pose interesting questions. Also I believe there was an hvac youtuber that to paraphrase, mentioned we should always be exploring, learning new things, and new techniques. Otherwise we would still be charging systems by feeling the pipes.
Oh I love your thought process. I apologize I should have worded that better. Soft solder has just left a sour taste in my mouth over the years. I've also received a good bit of email from the loyal soft solder members trying to recruit me to the dark side. I apologize for comming across harsh. A company called solder weld would be a great reasorce for they diffrent types of Rossen core (non corrosive).
Looking at new methods and solutions is great. Dont let anyone stop you from exploring ideas. I was contacted by Parker/Sporlan today. They have a new products the want me to look at a new product called the zoomlock max and now a zoom lock push for connections. Hopefully I can check them out soon.
I don't know about the algorithms I dont even consider myself a youtuber. I just want to be able to help some people. I still have a lot to learn about HVAC and I'm a complete noob at the UA-cam thing!
Thanks for your patients and never stop learning.
Question: is that an easier way to check the txv without checking the charge?
for example: if I just check the temperature before and after the txv can I tell if it's bad?
Measuring superheat is the only way to check aTXV since it's trying to control superheat.
Measurquick app has a method to check the charge of a system without using gauges, called non invasive testing. You will need the full probe set but search Measurequick non invasive testing and you will find an article on that.
Non of the methods uses temperature drop across the TXV
do you need to recover the refrigerant to replace the power head?
Yes
Welcome shering good testing and adjusting thermostatic expansion valve. To test adjusta new tx vor valve wich is out of adjustment follwing tools and materials are required a srevice cyinder of refrigent 1 R12 . R22 to supply 70 psig pressure. A highpressure gaugeto indicate valve in let pessure anda lowpressure gauge compoumd )to indicate valve out let pressure samll quantity of crushed ice in a n insulated container proced as follws to adust valve .. the oen the sreice cyinder build 70 psg warom the cylinder if required on thehigh pressure age conected in the line the vlve inlet the expashion vlve ca now be adjusted the pressurethe our letshold be equal to the pressureof the refrigentto be chargedinthe systomattemperature 22°f if 10°f super heating is rquired the temperature ofthermal bulb is 32 °fthe superheatingis to be 10°fthen the temperature of refrigerant will be 22°f and pressure mustbe adjusted to much this 22°fthe pressure on the out let gauge should bs differnt for various refrigerants astap bodey of the valve lehtly oder ti determine if the valve is in soothe operation the poiter of low pressure guge shold not jump more lode adjist jest drmi spring adustinv only lord and slowly exp gas r22 22psig r22 ..45 psg is ..ok gues opershoion welcome...
Food for thought: if the sensing bulb is subjective to temperature from outside sources hints the need to wrap it with insulation tape is the capillary tube between the bulb and power head equally influenced ?
Great question.
I do have a friend that sprays insulation on that tube but I find it unnecessary.
The liquid vapor mixture is inside the bulb itself also factored the volume of the bulb. The size of the capillary tube is small, very low volume.
So yes it possibly could play a factor but I overall such a small amount it's not worth the worry.
Airflow, ductwork, filters, home air sealing, refrigerant lines and bends play a bigger part.
All TXV have a swing as well. They won't maintain a precise superheat. When that becomes a factor an EEV is the go to because it will keep the superheat on point and precise.
I love that your thinking about it!
I’ve seen some units where the txv is in the air handler and the bulb is on the suction line on the outside of the air handler (wrapped) I just wondered about the influence of the air temp between point A and B. Thanks for the response.
@@moonlightacmaintenance3232
Yep. That's the best way!
Next time I get to talk to an engineer or a lab test person I will certainly ask and get you a better answer.
Im always impressed where those conversations lead. Thank you for bringing it up.
Here’s another odd question, if I have a leak on my vapor side in a 410a system should you A) pump down the system and repair and top off charge after or B) recover and repair and recharge with virgin refrigerant? The reason I ask is fractionation a issue because it’s leaked out as a vapor opposed to a liquid ?
@@moonlightacmaintenance3232
Fracination is not an issue with 410A.
The 2 refregerants are so close together. Many tests have been done with this. A friend worked in a testing lab and they found even charging 410a as a vapor was not an issue.
I will still recover and charge all new refregerant, because I don't know the practice of the last person that serviced it. Did they pull a proper vacuum? Did they mix refregerants? Did they properly purge their noses each time it was serviced? All these unknowns is why new refrigerant is cheaper.
Great stuff. I think for those cutaway moments with diagrams and such, it would be a much nicer video if you added some soft jazz music or elevator music. Some kind of sound would make it much more pleasant
I will see what I can do for next time. thank you for the suggestion.
Vrey nic full and reding bacical bai organnl cs ok
Cork Tape is horrible. It is extremely messy. I definitely like foam tape over cork tape
One question bro how do you know the in and the out of the TXV and if you put it wrong what going to happen thanks