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Thermostatic Expansion Valve TXV VS. Piston Fixed Orifice! HVAC Metering Devices!

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This HVAC Training Video is about Thermostatic Expansion Valves TXV's vs Pistons. I go over Metering Devices and how the TXV is different than the Fixed Orifice along with the safety, efficiency, and service procedures involved. I compare 4 major points of difference and how they affect the installer's decision to use them. I go over refrigerant charging procedures and troubleshooting practices as well! Supervision is needed by a licensed HVACR Tech while performing tasks as Experience and Apprenticeship garners Wisdom and Safety.
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Information in this video is intended for educational purposes only. Any work related to the topics in this video should be performed by licensed technicians or by apprentices under the supervision of licensed technicians. AC Service Tech LLC is not responsible for any possible damages or injuries caused by the use or misuse of any information provided.
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15 авг 2024

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Комментарии : 202

@acservicetechchannel 7 лет назад

Tool List- www.amazon.com/shop/acservicetech Support- www.patreon.com/acservicetech For those that are looking for the tools used in the videos: (Linked Below) Here is the Link for the Yellow Jacket Refrigerant Manifold Gauge Set used in the videos- amzn.to/2aenwTq Here is a link to Refrigerant hoses with valves used in the videos- amzn.to/2aBumVI Here is a link to the UEI DL389 Multimeter used in the videos- amzn.to/2xAdaJf Here is a link to the Imperial 535-C Kwik Charge Vaporizer for Charging Refrigerant- amzn.to/2wFHtBW Here is the link to the Fieldpiece ST4 Dual Temp Meter- amzn.to/2wc1ME3 Here is a link to the Digital Refrigerant Scale used in the videos- amzn.to/2b9oXYl Here is a link for RectorSeal Bubble Gas Leak Detector amzn.to/2ckWACn Other tool links can be found in the video description section. ACSERVICETECH is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon. Check out other videos on the HVACR topics of interest at- ru-vid.com/show-UCOZR-1IqsAer9wzlvFgb4mAplaylists?view_as=public If you want to support the ACSERVICETECH Channel and receive more HVAC content, check out www.Patreon.com/acservicetech

@tonybridgens3948 7 лет назад

acservicetech looking for information on heat pumps

@acservicetechchannel 7 лет назад

Tony check out the Heat Pump playlists on the channel page!

@juliusshalom9099 6 лет назад

Thanks for the awesome videos man. I was just wondering if you could please explain how the equalization tube works.

@griffita1 Год назад

Thank you! I had new AC units installed May of 2022. In September one of the units stop blowing cold. It is under warranty, the tech came out & identified the TXV was bad, he then said they would replace it with a piston that is more reliable. I have a friend that has been in the business for 30yrs, something prompted me to run it by him to see if the tech was correct. He said no, get them to replace the TXV because of the efficiency. I called the company to let them know, & expressed my dissatisfaction with a lesser technology being installed in the system than what I paid for. The owner called me back & said my friend was incorrect, but they will install a TXV if I wanted. My friend also said they should replace the dryer since it was probably junk in the line or possibly the bulb was damaged because a TXV shouldn't fail so soon. I stuck with my friends advice, then saw this video & it validated him.

@charlesjackson9602 Год назад

You need to ask you freind how much it cost to replace your txv...if its out of warranty...do all the evacuation...refrigerant recovery.....etc...i bet you if cost more than cost saving of the tvx...i work on air cond for over 30 years...never had a piston to fail.....but tons of expansion valves....i even changed the one in my own home from a txv to piston....realibity more important than effiency....imho...

@jonstonham 3 года назад

The best and most visually descriptive explanation about the differences between TXVs and piston metering valves that I have found. Really great video!

@acservicetechchannel 3 года назад

Glad you liked it!

@deonschlesser6451 5 лет назад

Love your videos, helping me big time. Been an installer for about 2.5 years, and im wanting to learn how the full system works instead of just knowing "that goes there and it just works". You have lots of detail. Thank you for posting these videos👍

@acservicetechchannel 5 лет назад

Thank you very much Deon, glad to help!

@dbru2650 4 месяца назад

Wow, I've worked in the HVAC field for 45 years (that's correct, I'm an old man😉) and instructed many beginners over the years, but I've never been able to explain the operation of a TXV as well as you did! GREAT JOB!!!

@AliBaba-cf4iu 5 лет назад

Mr. you got to be one of the best..... out there explaining hvac systems and how they work, thanks

@acservicetechchannel 5 лет назад

Thanks a lot Ali Baba!

@andrewsilversmith166 3 года назад

Thank you for explaining. Could not find anyone else who explained this clearly without being totally confusing.

@acservicetechchannel 3 года назад

Awesome thanks Andrew and make sure to check out an article I just posted on the TXV bulb location vs external equalize location at www.acservicetech.com/articles

@rj.parker 7 лет назад

Good video. Advantages to the homeowner is always a good thing to know. Superior humidity control because of better moisture removal (especially on cooler days) and easier and more accurate charging for lower cost operation are good talking points.

@acservicetechchannel 7 лет назад

Absolutely, awesome insights!

@RayRay-nb7tn 5 лет назад

This is an A++ Video on a txv vs. Piston application. Had a customer ask what the difference was and why. Good explanation. Thank you for the videos. HVAC ON!!!

@acservicetechchannel 5 лет назад

Thanks Ray Ray!

@1971omi 4 года назад

Awesome teacher. God bless you. Thank you for your time. I'm hvac student and learned so much from you. Appreciate it.

@acservicetechchannel 7 лет назад

I just wanted to point out, I did snap this bulb back on with the clip with the stub on the top. The stub should always be on the lower side and the tube going to the txv should be higher so it is just vapor going to the head of the txv. I just wanted to point that out before anyone asked and didn't want anyone confused by that. My apologies, it was late here when I did this and was just trying to get the video out. Thanks!

@acservicetechchannel 6 лет назад

If you want to support the ACSERVICETECH Channel and receive more HVAC Content, Correspond, or Collaborate on your endeavors- check out www.Patreon.com/acservicetech All of the ACSERVICETECH Playlists- ru-vid.com/show-UCOZR-1IqsAer9wzlvFgb4mAplaylists?view_as=public Submit your email to the ACSERVICETECH email updates list at info@acservicetech.com

@Alienspecies635 Месяц назад

Always very informative. I do find it harder to get my pressures on point when it's and older system with a piston. Nothing better than a nice TXV that reacts immediately when you add a few ounces. I find that the piston's don't always react well on my suction pressure and will just raise my head pressure then I switch over to my testos and put my temp clamps on and check my superheat so I don't over charge but I find it much easier to check my sub cooling,

@Guyhakverdi 6 лет назад

Yesterday I installed ICP N coil 3 tons with TXV(I don't like them at all. I always go with piston setup but dimensions were limited so end up using this type of coil) turn it on and I was reading 135 psi -3SH on my suction, 250 psi 6 SC. Outside 75, house wet bulb was 72. I was so mad at the txv being open because it was flooding but after this video I hope to see it 5SH or more when I go there to check it next week, under normal conditions in the house. Great video thanks for sharing.

@acservicetechchannel 6 лет назад

Well, the txv should always hold a factory set or tech set superheat. Some txv's are non adjustable. The txv allows more refrigerant through when the load is high but will still maintain the same superheat. On a day that has lees of a load, the txv will let less refrigerant into the coil but will maintain the same 10-14 degree superheat. If you have 0 or negative superheat, something is very wrong. Check to make sure the txv is 3 tons if the outdoor unit is 3 tons. Make sure the bulb to snug to the suction tube. You could try to adjust the txv if it is an adjustable model. Or you could also try putting the bulb in hot water then cold water then hot water again to get the inside moving, verify it is moving. It could be stuck wide open. Also you could try moving the bulb outside of the coil box on the suction line. Anyway, there are some ideas but don't let it run with 0 superheat or less because that would hurt the compressor if it is a single or two speed compressor that is on a conventional system and doesn't have an accumulator to protect the compressor, thanks

@Guyhakverdi 6 лет назад

acservicetech I m going back there to check it again. I was also suspicious about my Testo gauge set. I ll check it again and try the hot and cold water trick to make it moving. Thanks a lot.

@todnog 5 лет назад

Well DIY the new system in my house and the outdoor unit came with a piston . So I went back inside and took the inside oil box apart I saw that had a TXV this video helped me knowing that I have either one or the other but not both thank you

@robertl.7657 5 лет назад

Outdoor unit is a compressor, compress vapor, and condensetes to liquid for the Txv,or piston, to reduce temperature, allowing refrigerant to absorb heat

@leoashrae4199 7 лет назад

Thorough, well presented, explanation of how this device works. I wish some long-time HVAC techs would review (and understand) the principles and operation of TXVs. 99% of the valves I've replaced died because they were plugged with crud, not because the valve failed in any way. Regardless, if the problem was the "Copeland" compressor rust inhibitor issue or a bad initial install (no nitrogen purge), the "actual" problem normally is "not" the TXV.

@acservicetechchannel 7 лет назад

You are absolutely correct and thank you very much for your great comments!

@youngbeechnut78 7 лет назад

Very well executed! I have a question, I was always taught that the txv bulb should be insulated to sense line temperature rather than having it exposed and sensing air inside the cabinet potentially leading to an overcharged system if not careful. Thanks for sharing your wisdom!

@acservicetechchannel 7 лет назад

Some manufacturers insulate the txv in the cabinet and some don't. When I install them I insulate them to be safe and also the tube from the bulb that carries the refrigerant to the txv should be up and the stub should be lower when horizontal. I realized that I did that after I made the video, ha. Thanks

@brianosegueda3622 2 года назад

Awesome explanation on the difference between a txv and a piston.

@ygthrasher7265 5 лет назад

Txv is Cadillac of metering devices. Maintains desired superheat. Makes troubleshooting easier. But very sensitive and harder to replace than a piston. After piston fails on new instal I recommend txv as replacement.

@111000100101001 2 года назад

Never had a piston fail but had seen many txvs fail and take out compressors :(

@frediszamora7881 4 месяца назад

The best teacher l learned so much from this guy

@charlesjackson9602 Год назад

in my experience i much rather have the fix piston versus the expansion valve...you have to change it out at aprox 10 years at least....and what little you save....is lost big time.......and it sensitive like when copeland oil additive issues back a few years ago....realiblity is more important than effeciency...in my opinion....great video...

@DJPenguino51 6 лет назад

I wished that my family's evap coil had a TXV vs a piston. First, some info on the system. It is a York system. Air handler I believe is a 4 ton and the condensing unit is 3.5 ton. It has a 3.5 ton sized piston in the evap coil. It cools alright but all it can muster is a 13 degree delta T. The system has a LOT of airflow and blows pretty good. As far as I know, the system has the correct refrigerant charge. Condensing unit is a microchannel (gasp!!) and has a charging / temp chart on the unit (can't go by superheat). I'm sure that the delta T would improve if it ran longer (probably maxing out at 15-16). The set point is 75 on the thermostat. While TXV's can go bad, it's my belief that the delta T would be slightly improved if the evap coil had a TXV.

@acservicetechchannel 6 лет назад

You should be able to get 18-21 delta T with a txv and a proper charge, thanks Ronnie

@chriswagner4398 5 лет назад

Thank you for sharing your insight and years of experience which is true teaching through experience or truly evolved special knowledge which is priceless great job.

@douglaswatters7303 Год назад

I've got about 20 rental properties in south Texas were it's in the mid 90s about 6 months of the year. I have fixed orfice (piston) metering on all my units and I don't care what any tech says I'll never use TXV. Txv get stuck, and cause more problems that they are worth. Txv also are hard on compressiors because the pressures don't fully equalize on high/low side like a fixed orfice. I don't care if fixed orfice is slightly less efficient the headache of txv just isn't worth a slight efficiency gain.

@AIthings82 6 лет назад

Oh man, i love ur Chanel, Now i understant perfectly and can see what happening in the condenseur and evap. my first language Is french and m'y english Is not vert good but ur explaination Is very clear and its more easy to me to understant. Big big thnx. Im better than ever Now ;) i just need a psychrometer to find the correct super heat ween i have à piston at job 😄💪👌👍👍👍

@acservicetechchannel 6 лет назад

I have the "General digital psychrometer" linked at amazon.com/shop/acservicetech - I think it was like $77 but I used that one for years. There is also the Fieldpiece one that links to the SMAN 460, thanks

@AIthings82 6 лет назад

acservicetech i Buying sman460 last week and i think i Will Buy the spychometer for this. Thnx teacher for ur heap and Tuto.

@acservicetechchannel 6 лет назад

Glad to help, thanks

@charlesjackson9602 9 месяцев назад

you mention about fan motor stoping and with a piston...and floods....more time than not i seen expansion valves lock up....and cause compressor to lock out....i even seen a expansion valve lock up during defrost cycle on a Heil unit before...

@Meteora125 6 лет назад

So well explained! Thank you!

@acservicetechchannel 6 лет назад

Thanks Meteora!

@titusrider7948 2 года назад

If you pause video at 2:01 you see two types of pistons. You said "older style piston" is bottom and "newer type" is top. My research indicates that the bottom piston is a Carrier type and the top is a Goodman type. Questions: is that true? ; can you interchange the "old type" with the "new type" ? ; in other words, if the pistons are brand specific can they be interchanged?

@nandanvyas8158 4 года назад

Good guy, you are gifted for teaching 👍

@acservicetechchannel 4 года назад

I appreciate that!

@billduessel2592 6 лет назад

Excellent explanation of the processes. Thank You!

@acservicetechchannel 6 лет назад

Thanks Bill!

@joetech5787 5 лет назад

Man, I love your videos, very well explained. Thanks

@acservicetechchannel 5 лет назад

Thanks a lot Joe!

@greenpoint23 Год назад

Excellent video.

@thomasnavarro4642 Год назад

Damn, amazing video I learned alot thank you.

@turningtodd 6 лет назад

Thank you for this video as a homeowner. Our 16 yr Amana Prestige 2 quit working after being gone for 10 days with high temps outside...I had left the thermostat at 80 deg. When we got back, apparently the Evaporator froze up. The initial HVAC repair person told us we needed either a new Central Air System for $4K or he could replace the Coil for $1700. I replaced the TXV and the system is working perfectly. My question is, what caused the TXV to fail...and exactly how did it fail? Did it get stuck closed...which caused low refrigerant...thus freezing the coil? In the future, would I have been better off, slowly adjusting the thermostat down like from 80 to 76, 76 to 73, etc...would that prevented damage to the TXV? Thank you!

@acservicetechchannel 6 лет назад

You should be able to set the tstat at any temp 68 or above in cooling and be able to run until it gets down to there with no problem. The txv could be bad due to manufacturer defect, brazing too close to it, brazing without nitrogen, anti corrosion compound in the compressor oil from the factory, bulb tube bent and leaked refrigerant from the bulb. Make sure you are epa 608 certified before handling refrigerants, thanks Todd!

@polymyxa8233 5 лет назад

Great technical information and really well explained. Thank you!!!

@acservicetechchannel 5 лет назад

Thank you polymyxa!

@johncarr123 11 месяцев назад

I had a new evap coil installed and they forgot to install the orifice piston and the system was running for 2 months without the orifice installed. Can the compressor be damaged with this missing? Also when they discovered that the piston was missing they opened the line installed the piston and did not vacuum the system down and just added refrigerant.

@frediszamora7881 4 месяца назад

Formula to find super heat Wet bulb x 3 - 80 - outdoor temp divided by 2 = TSH

@lamassu4100 4 года назад

The expansion valve should have maximum opening, then just put a piston the same size of the opening. Expansion valves break a lot.

@Ray-wr2wr Год назад

What about Piston ? Do they fail alot?

@wilwiljames1 2 года назад

I bought a new a-coil that took a TXV and the opening of the distribution tubes had a schrader valve, why was the valve there?

@Sc19869 8 месяцев назад

The txv are so awesome.

@jascam1 2 года назад

My newly installed GMan 3.5 ton HP is sweating on outside of evap cabinet and lot of water under outside condenser. Tech replaced TXV with piston in hope of fixing, Is this right??

@whitesheatingairappliancer7101 7 лет назад

I would like to see a video on custom evaporator case fabrication. Thank you

@acservicetechchannel 7 лет назад

Thanks for letting me know Ron!

@davidb2438 4 года назад

I understand that TXVs are more efficient, but which device (TXV vs Piston) is most reliable for comfort cooling in a place like Florida.

@samersarah957 2 года назад

Thank you Craige for informative video. Q:I got a ductless mini split 24 BTU utilizes with piston not EEV is possible to check the refrigerant like central air conditioning? Thanks.

@sman5877 4 года назад

Great help and very well explained.

@acservicetechchannel 4 года назад

Thanks a lot s man and if you have any technical questions feel free to email me at info@acservicetech.com! Thank you for your support on Patreon!

@jorgearturomacias8281 2 года назад

What size of piston should I use for a 4 ton 410 unit?

@Ray-wr2wr Год назад

Hi Do Piston valve fail ? Do I need to replace it? Mo coil are freezing up after 3 hours when my ac running (R22)

@michaelmadrigal9566 7 лет назад

Just curious....could you attach a thermistor sensor inside the coil in series with the condenser low voltage to shut the system down on low ambient days?....Great videos...I look for to getting them

@acservicetechchannel 7 лет назад

You could. That is the concept with economizers so that instead of turning on the compressor, it pulls fresh air in from outside instead. Thanks Michael Madrigal!

@donnierobertson3088 3 года назад

Great job and video like always

@noealeman8527 4 года назад

Great video!!! Like always , Thank you ..

@mark.r8900 4 года назад

thanks for the great video. i always thought that high outdoor temp on hot days will pushed more refrigerant through orifice (more pushing pressure) than on cooler days. BUT, you're saying the SAME AMOUNT of refrigerant goes into the evaporator ALL the times. Please help to clarify. thank you.

@caru3257 3 года назад

it is the same amount at all times with piston.

@BelezaMedSpa 4 года назад

What would happen if the outdoor unit says TXV metering is needed and a piston is installed instead?

@UltraHydrophobiccoat 4 года назад

Are the screw caps on the orifice/piston and TXV compatible on the distributor side? If not, what normally technicians do when a piston is replaced with a TXV? Completely remove the distributor small pipes? Can you do a video for that. I completely self study and would like to know what’s the normal procedure to do the convention. I searched on RU-vid and didn’t find any good videos to describe all the concerns about the replacement. You always give best great videos. Thank you for your efforts

@acservicetechchannel 4 года назад

Glad to help and you will keep the same distributor tubes that are there regardless of the metering device type. The distributors are sized for the coil and the average flow of the piston and txv should be similar. It is just that the txv will be more efficient when there is a higher heat load at the evap coil, thanks!

@jimtalor7971 4 года назад

If an evaporator coil gets change does the txv gets change as well or does this part gets removed and transferred to the new evaporator.

@acelookrenos611 5 лет назад

Hi mate I have a question according to the information below Unit is ducted split system r22 Suction line actual temp was 24 to 25 Celsius Suction line saturated temperature on guage was below 0 around minus 8 or 9 degree when the unit was on cooling mode( I have regassed it according to reading plate and fixed the leak of Schrader valve as well before any action) Discharge line pressure 240 250 psig Metering device was not mentioned on reading plate but I checked the indoor unit it was piston device or capillary (definetly not txv) so the super heat too high And discharge temperature 32 33 Celsius ( too much pressure was stored behind metering device in my opinion) Condense dry bulb 26 27 Celsius I'm in Australia My question is that Can we make sure that there is blockage in metering device of indoor unit? If or could this blockage be somewhere else which I don't think so. What's your technical opinion. Do I have to replace the metering device only or some more parts? Many thanks I do appreciate

@acservicetechchannel 5 лет назад

It sounds like there is a restriction like you were mentioning since there is such a low suction pressure and high sat temp. If the outdoor unit is just a outdoor condensor and not heat pump then I would suggest replacing the filter drier, piston, and strainer screen right before the strainer. On a heat pump, the inactive metering device may be before or after the liquid line port. If the evap has cap tube installed, I would replace the evap with one capable of having a piston or txv. I will always install a txv though, thanks

@aldiaz6651 5 лет назад

Again excellent video 👏👍👍👍

@acservicetechchannel 5 лет назад

Thanks AL!

@dissociativecat7495 3 года назад

does using a TXV change the seer of the outside unit or is that more compressor efficiency

@michaelmead2076 5 лет назад

Love the videos! I have a few questions. Do you install or service and Goodman, Amana or Daikin equipment? I’ve been trying to get a few answers but can’t seem to get them. I always install TX Valves on my new systems and I always stick with Amana because they have scroll compressors. The Goodman units comes with a rotary which calls for a hard start kit if you were to install a TX Valve on that condenser. My question is, the 13 SEER unit calls for a TX valve by Emerson which is adjustable. The 16 SEER and higher units call for a TX Valve by danfoss which is not adjustable. What is the purpose of having a TX Valve that is adjustable? I understand that you need to charge the system based on sub-cooling, but do you need to take your drybulb and wet bulb readings with a TX valve that is adjustable and adjust the valve to that superheat? I wouldn’t say from the factory that they Valve is set to a point where you don’t need to adjust it? Also when you are checking a system with a TX Valve and you check your subcooling, is your superheat going to be relatively close to the same as your target subcooling? Do you check drybulb, wet bulb to find target superheat and adjust if necessary? Or do you charge only subcooling and call it a day?

@acservicetechchannel 5 лет назад

So most AC unit TXV systems are nonadjustable. In the case of a TXV that is adjustable, they are usually set close to the normal superheat needed. You would normally run the ac unit and set the subcooling to the correct amount. Then you would check to see if the txv is working properly around 8 to 16 degrees of total superheat. Normally they operate around 10-14 degrees but for a new system install, they may take some time to settle into the correct superheat, thanks!

@titusrider7948 2 года назад

Are the two piston types "old" vs "new" interchangeable? Or are they brand specific?

@logzz6373 2 года назад

Thanks !

@esbigerodeo1 7 лет назад

love the video's as always. any idea on when you'll put together the video on microns vs. inches of mercury?

@acservicetechchannel 7 лет назад

I do thank you again for the reminder. I have a backlog of videos in the works, thanks

@esbigerodeo1 7 лет назад

np buddy,im just intrrested in hearing your view on it. thanks bud

@marlienfaek9402 5 лет назад

Which one is better when air conditioning system working in heating mode.

@acservicetechchannel 5 лет назад

Can you rephrase your question? Not sure exactly what you are asking, thanks!

@nickush7512 2 года назад

Excellent.... so many thanks :)

@metalhalide4043 5 лет назад

How does an overcharged system with TXV effect Superheat/Subcooling and compressor cycling? Does the TXV maintain the same superheat and evap pressure with varying liquid pressure at the TXV?

@acservicetechchannel 5 лет назад

The txv will try to maintain the same superheat even if the subcooling is high. The compressor amps will be higher and the heat rejection capability will be less at the outdoor unit if it is overcharged, thanks!

@leone390987 2 года назад

Fantastic Ty

@mark.r8900 5 лет назад

hi, if i were to replace a piston with a txv. how would i size it? does new txv comes with a pre-set superheat already? i saw a new txv from supplier bag and it says 18-36BTU. thank you.

@acservicedaytona386portora3 7 лет назад

touche' my friend..again an excellent video....

@acservicetechchannel 7 лет назад

Thanks you!

@whitesheatingairappliancer7101 7 лет назад

Great video thank you.

@acservicetechchannel 7 лет назад

Thanks Ron!

@channelcatchaser9426 7 лет назад

Are all piston universal throughout the different brands even if they look nothing a like? great video.

@acservicetechchannel 7 лет назад

Most brands will take the ones I showed in the video but there are also smaller versions as well with piston chambers that loosen clockwise instead of counterclockwise. Thanks Channel Cat Chaser!

@ocelott75 4 года назад

Will a Trane piston work on a Carrier evaporator?

@hvacworkshop4791 7 лет назад

When I step into a new customer's house, how do I know what is used for metering? Should I drill a hole and use inspection camera to looking for it?

@allanmills3248 6 лет назад

Gerry Cui really I hope this isnt a real question....if you think u need to drill a hole an use a camera to see if they are using a piston or Txv for a metering device you shouldn't attempt anything

@caru3257 3 года назад

Here I am removing the doors.

@keithhoward8651 7 лет назад

Great video. Thanks for the info

@acservicetechchannel 7 лет назад

Thanks Keith Howard!

@daviddelgado475 5 лет назад

Very well explained

@acservicetechchannel 5 лет назад

Thanks David!

@daviddelgado475 5 лет назад

@@acservicetechchannel you are very welcome another thing to add on to what I said is that you work very clean and you are very well spoken you are very articulate explaining things but you do not use language that is over complicated which I love about your Channel God bless you and your beautiful family I wish you continued success I will be going to HVAC school January 12th God willing I am missing my right hand but I was born that way and I am also a licensed Barber and a licensed real estate agent in Florida figured I pick up another trade and I always find a way to do the work I also saw how you did the flare on the pipe which is so clean it was so impressive but I noticed that there is a gun that does that for you or a drill I guess you would call it, expensive but I think it would benefit me a whole lot either way sorry for the long winded message encouragement to you my brother keep on being the pro that you are

@acservicetechchannel 5 лет назад

David, I really appreciate your note and may the Lord Bless you as well! I am glad you are encouraged by the videos and Florida is probably a very nice location for an HVACR tech, thanks again!

@juliolopes2892 7 лет назад

When brazing your line sets and purging the system with nitrogen are there any issues with the nitrogen flowing through the txv, as long as the temp sensing bulb is at a temperature that the valve would see as demand it should be wide open right ?

@acservicetechchannel 7 лет назад

All comfort cooling txv's don't shut all the way, even if the bulb lost refrigerant, thanks!

@johncote2776 7 лет назад

Do people use Humidifiers in the winter time there? Id like to see a video on Humidifiers. I recently came across a Humidifier installed with an ecobee3 thermostat and both sets of wiring configurations left a new humidifer to not work or work intermittently.

@acservicetechchannel 7 лет назад

Thank you for letting me know what you would like to see!

@utubedestroysmytime 5 лет назад

I disagree with the statement that a txv works better instantly. I usually need to let it run 1-2 hours so that the sensing bulbs eventually loses pressure after being strapped to the suction line before the equalizer and then is open and floods that evap better. I’ve over charged several systems going off subcool IMMEDIATELY after start up. Maybe just a Texas thing since the txv was sitting in a 120f truck and the bulb was pressurized and shut tight

@acservicetechchannel 5 лет назад

After 10 minutes, you can check the charge with subcooling but still monitor the superheat for diagnosis. The refrigerant is in the system and you can see the levels by reading both superheat and subcooling. As the system runs, the txv lets less refrigerant into the evap since the heat load is lowering. When a bulb is at 120 the orifice inside the txv is more open instead of shut since there is so much opening pressure but yes overall the longer you run a system, the more accurate you will be, thanks!

@muhammedaltamimi7919 6 лет назад

Your informations are amazing .. 😍

@acservicetechchannel 6 лет назад

Thanks a lot Muhammed!

@leone390987 2 года назад

Fantastic Ty.

@acservicetechchannel 2 года назад

Ty is a fantastic teacher!

@mark.r8900 4 года назад

hi, so does outdoor temp. affect txv? thanks.

@jameslecroy5740 6 лет назад

so you can replace a piston valve with an expansion valve?

@acservicetechchannel 6 лет назад

Absolutely as long as you can match up the connections of the new txv. They also make replacement txv's with multiple fittings for it, thanks!

@jameslecroy5740 6 лет назад

I guess you have to pull a vacuum before you change it out?

@acservicetechchannel 6 лет назад

Yes recover or pump down, then when the system is at 0psig, replace with the txv, followed by a pressure test, and then vacuum, before breaking the vacuum with refrigerant, thanks

@polymyxa8233 5 лет назад

@@acservicetechchannel How much would the whole process cost ?

@jackpast 7 лет назад

Another great lesson! What does the other capillary tube go to from the TXV on the upper left, Craig? It looks like everything with TXV is threaded, not brazed, right? Thanks for posting!

@acservicetechchannel 7 лет назад

The tubing coming off of the txv bulb head is connected to the txv bulb and the other tube is connected to an external equalization port to check pressure at that location. Where the external equalization port attaches to the suction line there is a 1/4" flare. Most manufacturers now braze that line into the suction line. The txv seals on both sides with teflon rings. Thanks

@bauhnguefyische667 7 лет назад

Connections at TXV depend on manufacturer, some are flare others are brazed in. As to the capillary tube on left upper side I have seen coils with sensing bulbs on the coil itself, but it is hard to tell where and how it lands from video. Note that the TXV only uses one sensing bulb to meter superheating though and it it most likely the equaling line.

@bauhnguefyische667 7 лет назад

Just a really good RU-vid channel to either brush up on or learn forced air from. Probably the best guy here I have seen, not the only one taking the time to teach for free, but with the amount of professional incompetence I have seen posted as 'Pro's", this guys is top tier. Thanks ACSERVICETECH for taking the time to teach !

@rickcantu4501 5 лет назад

I was at initial startup inside space was 85 degrees 150psi/390psi 410a super heat was 4 degrees and subcool was at 13 degrees, 22 degree delta t . Why is txv not keeping the 10-15 degree super heat ? 4 degrees is kinda low wouldn’t it ? Please advise thanks for your videos

@acservicetechchannel 5 лет назад

Seems like the txv is stuck in the open position or the txv is too big compared to the system. Is the evap coil small compared to txv and condensor or is the txv size bigger than the evap or evap and condensor? Also, if it is an initial startup, did the person who brazed it keep the bulb on the suction line while brazing next to it? That would have exerted a lot of pressure down on the txv as opening force. If everything looks ok size wise, I would try cycling the txv back and forth before and while it is running with hot tap water and ice water and switching the bulb back and forth between the cups of water. Maybe leave them in for 20-30 seconds each. You don't want to leave it in the hot water too long as you will not have any superheat for the compressor which would mean sat state refrigerant can get into the compressor. Anyway, those are some thoughts. I hope it helped!

@fernandovazquez5296 4 года назад

I HAVE PISTON CAN CHANGE TO TXV R22?

@majorscrap3190 5 лет назад

at 15:54 he said the refrigerant in the TXV was different from the system. I thought R-22 system, R-22 in the bulb. Incorrect?

@acservicetechchannel 5 лет назад

A better word would have been separated. The refrigerant that is in the system is separate from that in the bulb, thanks and great question!

@alicepet1994 4 года назад

Can I use bigger TXV to replace smaller Piston? For example, 5 ton TXV to replace piston on a 2 ton unit? Since the TXV can adjust the refrigerant flow, so it should be able to handle it. Is that right? Thank you so much for your nice videos!

@acservicetechchannel 4 года назад

no txv sizes are still needed such as a txv that has a range of 18,000btu to 36,000btu.

@alicepet1994 4 года назад

@@acservicetechchannel Thank you for your quick response. One more question, are the screw caps compatible on piston and txv? If not, I have replace the cut off small tubing on the other side of distributor? Thank you again

@jameswestii454 4 года назад

Does it matter if a txv mounts inside or outside the coil cabinet? I have a New Goodman with an A coil and removing piston and adding txv before install.

@acservicetechchannel 4 года назад

It does not matter but if it is outside, the txv must be insulated because it will have low temp refrigerant running through it so it would allow condensation of any humidity, thanks!

@jameswestii454 4 года назад

AC Service Tech LLC Good deal and thank you for getting back to me. It’s a Goodman TX3N4 and comes with a round insulation cup that fits the txv and velcro’s shut.

@MrChipBryant 5 лет назад

Very good!

@acservicetechchannel 5 лет назад

Thanks Chip!

@henryalcocer5127 5 лет назад

If a system is installed with a piston from the manufacturer, can you add a txv? Can txvs be added to any systems that have pistons?

@acservicetechchannel 5 лет назад

Usually a txv from the same manufacturer will fit onto the part of the piston chamber once the piston and front of the chamber is removed, thanks!

@henryalcocer5127 5 лет назад

AC Service Tech LLC thanks for your swift response!

@acservicetechchannel 5 лет назад

Glad to help Henry!

@johncote2776 7 лет назад

Excellent video. What do you recommend to seal the threads on a fixed orifice and TXV? Ive seen cases where a system is low on refrigerant and the nut is tight but the leak is from the threads. Do you recommend leak-lok on these?

@acservicetechchannel 7 лет назад

Typically the leaks are not coming from the threads but the seal face. A teflon ring is used near txvs or a flare with refrigerant oil or something like nylog is used but only on the face of the seal. Thanks!

@kareemafghani3027 7 лет назад

I tel my friend you are the best

@acservicetechchannel 7 лет назад

Thanks!

@fernandovazquez5296 4 года назад

can i change txv for piston? R22

@marlienfaek9402 5 лет назад

My Air conditioner turned of because making height pressure on heating mode .

@acservicetechchannel 5 лет назад

That sounds like your indoor airflow is not high enough or there is some blockage since you are absorbing heat outside but not able to reject it inside, thanks

@grumpyg9350 3 года назад

Perfect👍👍👍👍👍👍

@pistonring1399 6 лет назад

Hi! How do I recalculate/recompensate for the lost oil xoes goes with the refrigerant on recovery? Is there any mathematical formula to determine jow mu h oil is left on the system parts after the recovery?

@acservicetechchannel 6 лет назад

Actually it is very hard to determine that unless you have an oil separator in the line like car type recovery units. This is since you can't identify if it is oil or liquid refrigerant weight in the bottom of the recovery tank. There is much more oil in a split system or packaged unit than in a car. For the most part on a standard system that has not been recovered more than once the oil level should be adequate after recovery still.

@pistonring1399 6 лет назад

acservicetech, thanks for responding. Right now, Im working on my car and I lost my refrigeration through a leaking core. I forgot to put back the cap after used the gauges (where I found both pressures are loe) and my A/C wont run in the morning. Any advice.

@acservicetechchannel 6 лет назад

There is usually a low pressure switch that will not close allowing the system to turn on unless there is a some refrigerant in the lines, thanks

@pistonring1399 6 лет назад

acservicetech thanks

@pointed_chance30 6 лет назад

Good job Amigo

@acservicetechchannel 6 лет назад

Thanks Jose!

@UltraHydrophobiccoat 5 лет назад

So, the TEV should be installed vertically to work? Thank you

@acservicetechchannel 5 лет назад

It would depend on how the internal bypass is built but yes you are safe if the head is towards the top, thanks

@valerianlohrke7373 4 года назад

Thank you so much for your help,as I am currently going to school for HVAC.

@maxeyac 6 лет назад

If you have a txv and the blower quits running it will still freeze up.

@acservicetechchannel 6 лет назад

Yes the txv typically is not able to shut down completely but it lets a lot less refrigerant into the evap than the piston. That is much better for the compressor in terms of how much saturated refrigerant is entering into it, thanks a lot Kevin

@matehuala84 6 лет назад

So my question is do i can replace txv for a pisto

@acservicetechchannel 6 лет назад

I only replace piston with a txv for efficiency and compressor safety. I think some people take out txv's and replace them with a piston because they don't understand how txv's work maybe. They are pretty reliable and worth keeping, thanks

@matehuala84 6 лет назад

AC Service Tech LLC thank you l installed a txv and its working good

@alfredovasquez7067 5 лет назад

any brand of TXV works on any brand AC unit?

@acservicetechchannel 5 лет назад

You could have one with a braze on end, flare end, some with two different types of piston chamber ends so you need to check first but this type shown in the video is the most common that fits in the piston chamber, thanks!

@mattzurzola4664 7 лет назад

My superheat when I try to get it to 10° superheat my saturation temperature drops below freezing r22 my Wet bulb and dry bulb was calling for a 5° superheat today I have a 20° split return supply but on my high side my psi G is fluctuating all the time low side stays stabilized goodman units anybody have answers

@mattzurzola4664 7 лет назад

Thanks

@acservicetechchannel 7 лет назад

Is your airflow good or is it weak maybe do to dust on the bottom of the coil or something else. What dry bulb temp is inside, wb inside, db outside, high side and low side pressure exactly? Thanks

@mattzurzola4664 7 лет назад

Wb 57 db 80 58psig lowside 214-220psig high side keeps fluctuating 2.4 super heat 14 -17 subcooling keeps fluctuating 32degrees vsat 107 degrees lsat 35 degree suctionline 90 liquid line temp keeps fluctuating 48 degrees supply vent 68 degrees return vent

@mattzurzola4664 7 лет назад

Love your videos

@mattzurzola4664 7 лет назад

acservicetech I will check bottom side of evaporator tomorrow