Support and 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- kzread.info/dron/OZR-1IqsAer9wzlvFgb4mA.htmlplaylists?view_as=public If you want to support the ACSERVICETECH Channel and receive more HVAC content, check out www.Patreon.com/acservicetech

@coolramone

4 жыл бұрын

Superheat = "the temperature increase in vapor form (of the refrigerant?) in the evaporator coil." Because the line temp decreases in the evaporator coil, hence cooling the air. Am I correct ACST?

@user-pf7zt1ed1i

3 жыл бұрын

ااااااحلككببييييييبببببررر ضضض.صة. ص.ة صة. صة. صصةصى .صى .ضصى .صى.صة .صضضضصصة. ص. ةضضضضضضضضصى ٢ةةةة٢٣٢٢٣٣وصص٣و ٤٤٣٤ووو٤٤٣ت٤٤٤٤٤٤٤٤٤٤٤٣٤٣٣٣٣٣٣٣٣يقصف٤٤٤٤٤٤٤٣٣٣٣٣٤٤٣٢٢بقلبي في اشار من هلق بدك تنام قلي انا مو متلك نهار الخميس بدي انا مو متلك نهار الخميس بدي للفيديو في اشار من هلق بدك تنام قلي انا مو متلك نهار الخميس بدي للفيديو في اشار من هلق بدك تنام قلي انا مو متلك نهار تنام قلي انا مو متلك نهار الخميس بدي للفيديو في اشار من هلق بدك تنام قلي انا مو هلق بدك تنام قلي انا مو هلق بدك تنام قلي انا مو متلك نهار الخميس بدي للفيديو في اشار من هلق بدك تنام قلي ى انا انا مو متلك نهار الخميس بدي متلك نهارانا مو متلك نهار الخميس بدي انا مو متلك نهار الخميس بدي انا مو متلك نهار الخميس بدي انا مو متلك نهار الخميس بدي الخميس بدي

@user-pf7zt1ed1i

3 жыл бұрын

ااااااحلككببييييييبببببررر ضضض.صة. ص.ة صة. صة. صصةصى .صى .ضصى .صى.صة .صضضضصصة. ص. ةضضضضضضضضصى ٢ةةةة٢٣٢٢٣٣وصص٣و ٤٤٣٤ووو٤٤٣ت٤٤٤٤٤٤٤٤٤٤٤٣٤٣٣٣٣٣٣٣٣يقصف٤٤٤٤٤٤٤٣٣٣٣٣٤٤٣٢٢بقلبي في اشار من هلق بدك تنام قلي انا مو متلك نهار الخميس بدي انا مو متلك نهار الخميس بدي للفيديو في اشار من هلق بدك تنام قلي انا مو متلك نهار الخميس بدي للفيديو في اشار من هلق بدك تنام قلي انا مو متلك نهار تنام قلي انا مو متلك نهار الخميس بدي للفيديو في اشار من هلق بدك تنام قلي انا مو هلق بدك تنام قلي انا مو هلق بدك تنام قلي انا مو متلك نهار الخميس بدي للفيديو في اشار من هلق بدك تنام قلي ى انا انا مو متلك نهار الخميس بدي متلك نهارانا مو متلك نهار الخميس بدي انا مو متلك نهار الخميس بدي انا مو متلك نهار الخميس بدي انا مو متلك نهار الخميس بدي الخميس بدي

@user-pf7zt1ed1i

3 жыл бұрын

ااااااحلككببييييييبببببررر ضضض.صة. ص.ة صة. صة. صصةصى .صى .ضصى .صى.صة .صضضضصصة. ص. ةضضضضضضضضصى ٢ةةةة٢٣٢٢٣٣وصص٣و ٤٤٣٤ووو٤٤٣ت٤٤٤٤٤٤٤٤٤٤٤٣٤٣٣٣٣٣٣٣٣يقصف٤٤٤٤٤٤٤٣٣٣٣٣٤٤٣٢٢بقلبي في اشار من هلق بدك تنام قلي انا مو متلك نهار الخميس بدي انا مو متلك نهار الخميس بدي للفيديو في اشار من هلق بدك تنام قلي انا مو متلك نهار الخميس بدي للفيديو في اشار من هلق بدك تنام قلي انا مو متلك نهار تنام قلي انا مو متلك نهار الخميس بدي للفيديو في اشار من هلق بدك تنام قلي انا مو هلق بدك تنام قلي انا مو هلق بدك تنام قلي انا مو متلك نهار الخميس بدي للفيديو في اشار من هلق بدك تنام قلي ى انا انا مو متلك نهار الخميس بدي متلك نهارانا مو متلك نهار الخميس بدي انا مو متلك نهار الخميس بدي انا مو متلك نهار الخميس بدي انا مو متلك نهار الخميس بدي لل ى ى انا مو متلك نهار الخميس بدي الخميس بدي

@user-pf7zt1ed1i

3 жыл бұрын

ااااااحلككببييييييبببببررر ضضض.صة. ص.ة صة. صة. صصةصى .صى .ضصى .صى.صة .صضضضصصة. ص. ةضضضضضضضضصى ٢ةةةة٢٣٢٢٣٣وصص٣و ٤٤٣٤ووو٤٤٣ت٤٤٤٤٤٤٤٤٤٤٤٣٤٣٣٣٣٣٣٣٣يقصف٤٤٤٤٤٤٤٣٣٣٣٣٤٤٣٢٢بقلبي في اشار من هلق بدك تنام قلي انا مو متلك نهار الخميس بدي انا مو متلك نهار الخميس بدي للفيديو في اشار من هلق بدك تنام قلي انا مو متلك نهار الخميس بدي للفيديو في اشار من هلق بدك تنام قلي انا مو متلك نهار تنام قلي انا مو متلك نهار الخميس بدي للفيديو في اشار من هلق بدك تنام قلي انا مو هلق بدك تنام قلي انا مو هلق بدك تنام قلي انا مو متلك نهار الخميس بدي للفيديو في اشار من هلق بدك تنام قلي ى انا انا مو متلك نهار الخميس بدي متلك نهارانا مو متلك نهار الخميس بدي انا مو متلك نهار الخميس بدي انا مو متلك نهار الخميس بدي انا مو متلك نهار الخميس بدي لل ى ى انا مو متلك نهار الخميس بدي الخميس بدي

To have an instructor that intimately knows his subject matter of expertise is one thing but to have that coupled with the ability to explain its complexities in a way that is readily understood is absolutely golden. If you subscribed, you just struck gold.

@acservicetechchannel

8 жыл бұрын

I really appreciate your kind words, thank you!

@bigarch9075

Жыл бұрын

As a current HVAC student I second my instructor even some parts of the system so we can see show and tell plus get some hands on

Superheat: Temperature increase in vapor state. Subcool: Temperature decrease in liquid form. Thank you!

@acservicetechchannel

7 жыл бұрын

Thanks Armando!

@erikerdiana4281

5 жыл бұрын

very helpful. Thanks

@frankobrien6728

4 жыл бұрын

Very good broken down in simpler terms

@coolramone

4 жыл бұрын

Superheat = Temperature increase of refrigerant, right?

@mubinabdul8066

2 жыл бұрын

what is temperature subcooled & superheated

I'm going for a job interview for a maintenance tech after having been out of the field for awhile and I need to brush up on a lot of this stuff, and your videos are helping immensely. THANKS!!

@acservicetechchannel

6 жыл бұрын

That's awesome to hear, thanks

@naveenpedada5543

2 жыл бұрын

@@acservicetechchannel can i join with ur team as a tech

This is such an awesome video.. I've been doing HVAC for over 10 years now and the way he explains this is very helpful. Thanks for making awesome videos

I did a trade school 20+ yrs ago, we covered 40hrs on sh/sc. This 8 minute class is like Paul Harvey's and now the rest of the story . Nice splain

A much better explanation than others, breaking down the three states of refrigerant passing thru the coils. Also showing service valves after the condenser and right before the compressor.

Thanks, starting my first year apprenticeship and this helps refresh my memory. 👍👍👍

@acservicetechchannel

5 жыл бұрын

Very Cool, thanks! URA 617!

@henryharris3431

3 жыл бұрын

How are you doing these days? Still in the industry?

Yeah I'm pretty sure what happened here was the click and light bulb !!!! After having watched countless videos, I was skeptical as to how I would ever be able to understand what these terms were . Thank you so much for an excellent video....my mantra for remembering is - protect compressor at all costs!!! The comp is on a vapor diet... No liquids!!! TXV reverse....Holy crap I can't believe the simplicity of your clarification.

@acservicetechchannel

5 жыл бұрын

Yes that is very awesome! Thanks for your note and glad to help Denny!

For a novice you could think of the condenser as the "liquid maker" To make good liquid, you have to make sure it's pure, and the subcooling is a safety factor for that. IE how much extra heat you took out of the freon beyond what was necessary to turn him into a liquid. The evaporator is the "vapor maker" and to make good vapor, you have to make sure it's pure (with no liquid in it) and the safety factor for that is superheat. IE how much extra heat was put in beyond what was necessary to make "low quality" vapor. You really don't want liquid going back to the compressor because that could kill him.

Best channel on youtube. As a new tech this channel is priceless to me.

Thank you for the explanation and breakdown of superheat and subcooling in its simplest form. Very well said. 👍🏿

@acservicetechchannel

3 жыл бұрын

Thank you!

Good stuff. I'm still confused enough where I'm not sure I can explain this correctly to my boss.

This is The Best Video on KZread that Explains Super heat and Sub cooling... Keep up the Great work your doing on Teaching this trade

Your videos are amazing!!! We have been using some of your videos in our company to help the new people understand. Every week we have training classes

@acservicetechchannel

5 жыл бұрын

Very cool Steve, thanks for letting me know. Let me know of any questions that come up. Tell them I was asking, thanks!

@Gameboy_Steve

5 жыл бұрын

Yes sir I will, next week they will be doing how to OHM a compressor. How do you feel about NATE? The company I work for is paying for it, but I heard it doesn’t mean anything, it’s just an indication you might know it.

@acservicetechchannel

5 жыл бұрын

Nate was the thing that helped jump start my progression in the field. I took the heat pump service and install test after my first year in the field. I passed the installation part the first time and the second time a month later I went out and scheduled it on my own and took it on my own time and passed the service part. The company had paid for a review and testing so I took it upon myself to complete the heat pump service on my own time and expense. It was hard for me then because of my lack of time in the field but after getting the heat pump service and install and ac service and install, the company gave me a 4 dollar an hour raise and the owner took notice and started building into me to make me the person I am today. Nate was all part of that growing process so yes go for every cert you can get your hands on for the future, especially if your company has an interest in it and is possibly paying for part of it, thanks Steve!

@Gameboy_Steve

5 жыл бұрын

That’s amazing sir. That’s one of my goals is to teach people I only been in the field for 5 years still have a lot to learn. Thank you sir for taking the time to respond. I will let you know if I run into issues that I don’t understand.

@acservicetechchannel

5 жыл бұрын

That's awesome Steve, glad to help!

I just got my universal epa certification and I'm on day three as a technician apprentice this helps a lot!

Thanks for this great video. Very important to understand the concept of superheat and sub-cool

@acservicetechchannel

6 жыл бұрын

Absolutely, thanks!

Superb education.... The first to show up on the search results and very appropriate positioning !! Answered exactly the questions in mind in perfect style and context. Subscribed .... Very many thanks :)

@acservicetechchannel

2 жыл бұрын

That's great, thanks Nick!

WOW. This is an excellent video. I was taught this in school, but this is the best explanation I have heard. Thank you!

@acservicetechchannel

7 жыл бұрын

Thanks a lot for letting me know Boris!

Listened to my HVACR instructor for hours and didn't get it thanks so much!

@acservicetechchannel

7 жыл бұрын

Thanks Sol Spirit, glad it helped!

@tomswinburn1778

7 жыл бұрын

Don't feel bad. I never went to AC school, and my boss/trainer/mentor had the DICKENS of a time getting me to understand electricity. Controls were a total mystery to me for a LONG time. And then suddenly everything he'd been explaining to me just came together. Just like a switch. Dark to daylight. I LATER went to many schools. RSES, manufacturers schools and the like. But that initial learning curve was for me almost too steep to climb.

Best explanation of a fridge circuit and what’s happening in the system I can find, me and my apprentice have both subbed

Thanks buddy , you explained the Refrigerant superheat and sub cooling in such a easy way . Thanks for the learning

@acservicetechchannel

4 жыл бұрын

Thanks, have you seen some of my newer refrigeration cycle videos with an even better picture of the actual system? Thanks!

One of the best videos on KZread!! Thank you!!

@acservicetechchannel

5 жыл бұрын

Thanks a lot Kyle!

Your videos make a lot of sense. Thanks for sharing your knowledge!

@acservicetechchannel

6 жыл бұрын

Thanks Abraham!

Thank you for a simple way to understand it. I think I have subcool and superheat figured out. Now I have to figure out how do I use either to charge a system.

thanks you for putting your time into this video. you did a great job!

@acservicetechchannel

7 жыл бұрын

Thanks Peter!

very nicely explained thank you for sharing!!!!!

@acservicetechchannel

8 жыл бұрын

Thank you!

Hey man good job keep doing what you’re doing and great videos.

@acservicetechchannel

6 жыл бұрын

Thanks Jonatan!

ur a good teacher Mr acservicetech. thank you

@acservicetechchannel

7 жыл бұрын

I appreciate it David!

been finding for too long and this vid help me a lot, thank you so much

Very informative, thank you very much!

@acservicetechchannel

6 жыл бұрын

Thanks Akrom!

Thanks so much! Hoping to make contribution in the future.

@acservicetechchannel

5 жыл бұрын

Thanks a lot Russell YT!

So I just found your channel so far so good I'm trying to so some studying for a ase test thanks for the help I'm gonna visit your site as aell

@acservicetechchannel

4 жыл бұрын

Awesome Darrell!

A super simple explanation thanks for that.

@acservicetechchannel

7 жыл бұрын

Thanks Mainely History!

Thank you! Very well explained!

@acservicetechchannel

7 жыл бұрын

Glad to help!

Awesome! Thanks...Really liked your video.

@acservicetechchannel

4 жыл бұрын

Thanks Ice Cold!

But it is the best video about superheat and subcooling! Thank you so much

good instructor------SUBSCRIBED!

Easy and deeply concept for beginner.

Nice explanation. What is puzzling me is that I have been monitoring new air-water package heat pumps (on R32) and have been seeing periods zero superheat at the compressor discharge. I thought this was impossible, so have spent quite a bit of time measuring other units, and checking my measurements. I am still puzzled by it, but glean that compressors have recently been developed to accept 'wet' vapour into the compressor. One thing for sure is that COP drops when discharge SH is close to zero. Anyhow, my issue is this.... Is my new heat pump faulty? is the EEV control inferior? Is the EEV control made as cheap as possible ? or is it actually desirable to have a slightly wet suction. The COP on average is very good. I have seen a PH chart plotted with a vertical compression line that goes to a point of no discharge superheat. This is completely new and unknown to me.... any thoughts welcome

Great video. Thank you!

@acservicetechchannel

7 жыл бұрын

Thanks James!

Brilliant explanation 👏🏻👍🏻

Great video! Helped a lot as a refresher for a green guy like me going to an interview

Good explanation well done.

Great Video keep up the good work!!!!!!!!!!!!!!!

@acservicetechchannel

8 жыл бұрын

Thanks Raymond!

Great video, one of the best channels on YT for HVAC. Is it normal to have a Single state condenser (carrier CA16NA30) with a subcooling name plate of 10, but with a builder installed Piston for higher reliability? My new home has a carrier condenser with an empty piston package taped to the bottom recessed area where the whip connects. In this case, are the techs supposed to check charge by Superheat even though the nameplate says Subcooling 10 deg?

@acservicetechchannel

5 жыл бұрын

Yes, if you have a piston installed, the Total Superheat method would be used for checking the charge of a single speed split ac unit, thanks!

@steveandrews8301

4 жыл бұрын

@@acservicetechchannel Would you do the same on an automobible AC system with a orifice tube, then, ie, use the Superheat method? Are these methods applicable, Superheat (capillary / orifice tube), or Supercool ( expansion valve), with automotive AC coolant charges? Thank you. Great video!

A bit long-winded but encyclopedic depth. Very informative

Great video as always,could you do a video explaining how to use and measure WC with a manometer. Thanks.

@acservicetechchannel

7 жыл бұрын

Absolutely I will. I tend to target seasons so soon with the season change I will be doing furnace and gas related items. I plan to do conversions, adjustments, and diffferences between digital and standard manometers. Thanks and I value your input and questions!

@drummerdem50

7 жыл бұрын

+acservicetech Thanks

just saying Hi, hope all is good, great video I was listening to locomotion tango by modern talking today while doing an evap on a rtu today the screws have feet lol!

@acservicetechchannel

8 жыл бұрын

Nice, thanks and nice to hear from you!

Good explanation.

Thank you for the video

Would overfeeding of refrigerant from your TXV (metering device) cause high superheat?

I hv a 3 ton heatpump txv 20 yrs old, supercool is 14F, superheat is 10F if temp taken at evap vs 13F if taken outside on vapor line, outside was 94F, inside 76F, 1350 cfm on med tap measured low SP @.28 spec is .5 . Should use the superheat of 10F using temp at evap vs higher outside vapor line? How do these sound? l believe good, Thank you, love the channel.

Very good lecture!

@acservicetechchannel

5 жыл бұрын

Thanks Sparky!

During the phase change in the condenser the refrigerant undertakes a sub cooling effect, as the vapour reaches its saturation point it is sub cooled to 80% Vapour and 20% liquid to allow the system to condense efficiently and thus entering the throttling valve, Tev(Thermostatic Expansion Valvle) or the EEV( Electronic expansion valve). Dropping in both pressure and temperature the refrigerant is 80% liquid and 20% vapour, depending on ambient temperatures and refrigerant type. Entering the Evaporator it is super heated as the refrigerant absorbs heat from the ambient air being drawing over the coil by the fan. Once entering the compressor unless the system has a suction accumulator of course the refrigerant will be Vapour.

@josemartinez-jt6tw

Жыл бұрын

He just said that moron

Nice explanation...thanks.

Thanks brother, PPl that doesn't like the video just don't watch why you dislike important educational video.

@acservicetechchannel

5 жыл бұрын

Ha ha yeah maybe, it is ok and thanks for your support!

Very well explained

@acservicetechchannel

7 жыл бұрын

Thanks Mir!

This exactly how I was taught over 30 yrs ago. My understanding is it's not taught like this anymore.

@Ashroyer86

2 ай бұрын

Nothing is taught anymore.

Merci, excellente vidéo

@acservicetechchannel

6 жыл бұрын

Thanks Dave!

Excellent. Thanks.

I am just a beginner, but think this is clear explanation of what superheat and subcooling means...and where to measure it while working with AC systems. If TXV installed - measure subcooling. If piston intalled - check superheat.

@acservicetechchannel

6 жыл бұрын

Thanks Roman!

@Roman-3000

6 жыл бұрын

Your videos helped me a big time while fixing my AC unit at home! Thank you and God bless! :)

@acservicetechchannel

6 жыл бұрын

Thanks Roman!

Great job and video

@acservicetechchannel

4 жыл бұрын

Glad you enjoyed it

Where should the high side pressure port service valve be fitted when designing a new system and what are the advantages/disadvantages Of the location of these? Is there a difference is pressure?

very well explained

@acservicetechchannel

6 жыл бұрын

Thanks!

is it possible to have a built in gauge next to the evaporator and condenser to check for superheating and subcooling?

so subcooling and superheat are the temp changes WHILE IN the vapor/liquid form?

@acservicetechchannel

7 жыл бұрын

Hey Mark, subcooling is the temp decrease in liquid directly after the vapor/liquid saturated state when it changes to liquid. Superheat is the temp increase of vapor right after the vapor/liquid saturated state when it turns to a vapor. Also check out this video list. These videos hit those topics home that you are asking about. Thanks -- kzread.info/head/PLxnHR5_D2ojwbAc7K7DsjuasaDVfJeGSe

Great Video. Whate happens if you turn on the ac on winter time? does Freon still circulate through the system? Thanks

@acservicetechchannel

7 жыл бұрын

Yes it would. The system would be so efficient that the evap coil would freeze though due to not having enough heat to absorb while the outdoor unit would be able to reject heat extremely easy. Thanks

Hey ac service tech. I ran into a problem a couple nights on call. Thought i had a bad expansion valve. Got the new part and peaked the model and serial on evap and condenser and the condenser was a 1.5 ton paired with a 2.5/3 evap coil. I had 22 superheat, 55 deg ssc, line temp was 77, subcool was normal, coil wasnt really sweating that much considering the high humidity levels. Something wasnt right. Technical support insisted this was a matched system. Supply air temp was 77 after half hour operation. Split was 10 deg at most and i had to lower the fan speed to its lowest setting. Does this sound fucked up? Also the evap coil sits on top of a furnace in the basement. So its not sucking in hot attic air if the were a return leak somewhere. Anyway let me know what you think of this.

Would you be able to make a video explaining the function of sight glasses and there main purpose ?

@acservicetechchannel

8 жыл бұрын

I plan on making a video on checking the charge on a walk in refrigerator and I will be going over the function of the sight glass during that. That is a good video idea! Thank you for your input, I appreciate it!

@raymondbailey7045

8 жыл бұрын

+acservicetech Thanks

Thank you!

thanks

Thank you!!!

Does higher superheat confirms there will be only vapour in the suction line of compressor?

thanks for this ...

@acservicetechchannel

6 жыл бұрын

Thanks Again!

Nice presentation. Just so I can follow this closely, I have few questions. (1) When we say “saturation” do we also mean “condensation”, a phase change from vapor to liquid? (2) when we say “reject” heat, do we also mean “release” heat? (3) is the “metering device” also mean “expansion valve / txv”?

@burakokumus6040

3 жыл бұрын

Yes to 2nd and 3rd questions friend. For the 1st question; Saturation means: at that measured pressure the refrigerant is in both states in middle of your evap or condenser, liquid and gas form. Depending on what you want to do with it, it can condensate or evaporate at that point. Example; If the refrigerant is in your heatpump's evaporator in the room and if you want to cool your room, its going to evaporate from that half gas half liquid state! If you want to heat your room, it will condensate from that mixed state!

@philoso377

3 жыл бұрын

@@burakokumus6040 got it. Thanks.

@brandonnewyork11

2 жыл бұрын

@@burakokumus6040 great explanation !

So on the manufacturer's "stat sheet" on my AC (the thing with the serial #, model #, and all the electric specifications) it says "SUBCOOL 9F". I get that "9F" means 9 degrees fahrenheit, but what does this specification mean? That the subcooled state happens with a 9F temp drop in the condensor?

@acservicetechchannel

3 жыл бұрын

It means that the refrigerant has lowered 9 degrees between where the refrigerant came out of the saturated state in the condenser coil until where it flows through the liquid line service valve. Read the article I wrote on subcooling: www.acservicetech.com/post/the-hvac-subcooling-charging-method-explained

Nice

You explained metering devices working very well. Now can you explain how the refrigerant it self reacts to the HP system workings. Some would use water as an example but that doesnt seem to work for me . The temp of the raw refrigerant at ambient may help. Why would a liquid boil at a lower temp ?

@acservicetechchannel

7 жыл бұрын

These may help. A liquid boils when it has room to expand - kzread.info/dash/bejne/q3alps2bpdzbedI.html&index=2 -- kzread.info/dash/bejne/gadmua-KqKq5p9Y.html

@loucaldwell1142

8 ай бұрын

G

3:23 - What is discharge superheat and how is it calculated? The discharge line contains superheated vapor from the compressor outlet to the top of the condenser coil; but, I only recently heard of “discharge superheat” for diagnosis. Any insights?

Bro needs to run a 1-2 week course in person. Ill sign up if the price is right.

Hello I am thinking of doing over my ac system, in my country the temp is 90% summer,One TXV has a superheat of 4 and the next 8, would the TXV of 4 produce cooler air than the TXV of 8?, Both has the same part number just one has a lower superheat ?

Is it more accurate if the superheat is measured at evaporator exit point than at service valve? Since the line set run length, insulation, exposure to ambient temperature can vary from system to system. Let say evaporator coil of r22 are operating at 40f boiling point in the middle of evap coil, so the temp reading at the exit evaporator suction line should be around 45f to 50f to ensure there is minimum 5 degree superheat happening in evaporator, Then we can disregard the condition or the length of the lineset which can be affected and not giving the accurate reading at the service valve. I am talking about fixed orifice system here.

@acservicetechchannel

6 жыл бұрын

I am totally with you. Yes it is much more accurate to check at the exit of the evap but no manufacturers recommend adding a port there and we see no one doing this in the field. Here is the other side though. As important as the size of the saturated state and the superheat measurement afterward, the compressor's safety is very crucial as well. We would need to check the total superheat which is measured at the outdoor unit to make sure that there is no liquid getting back to the compressor if during the lineset run heat were rejected on the way back to the compressor. Also, back when pistons were mainly used, they were not really concerned as much with efficiency. We only recommend installing txv's for efficiency and compressor safety now, but hyes we need to keep the old ones running as efficient as possible, thanks

Superheat can best be described as additional heat added to a vapor.

@repetemyname842

7 жыл бұрын

Given that, Subcooling is simply the temp of a liquid when it is cooled below its condensing temperature.

@acservicetechchannel

7 жыл бұрын

Yes, thanks Repete Myname

@tomswinburn1778

7 жыл бұрын

When trying to explain to a novice my verbiage is "the amount of heat absorbed by the refrigerant BEYOND that necessary to affect a complete change of state" . That applies to superheat of course. The sub cooling you'd replace the word absorbed by the word rejected. Trying to make people "get" that cold air isn't made, rather heat removed is sometimes the hardest part of the job. Wish I'd had this channel 50 years ago. Or a computer. Good job servicetech.

@thebluelunarmonkey

5 жыл бұрын

@@tomswinburn1778 give them an analogy. "You know a can of air duster has liquid in it and under high pressure, when you spray it, the can gets really cold. When you press the trigger, gas blows out, and the liquid inside boils to replace the lost gas. That trigger is your expansion valve. That liquid gets colder just like how wind cools you by sweat evaporating off your skin - it removes your body heat." A can of air duster that has froze up also has low pressure, not enough liquid is boiling off fast enough, converting to gas. After you warm the can in warm water, the pressure increases because it's 60 degrees hotter and wants to boil off more quickly. Water turns to steam occurs when going above 212F. Steam at 250F is SUPERHEATED steam by 38 degrees. Steam cooled turns to water when cooled below 212F. Water at 200F is subcooled by 12F, it's 12 degrees below boiling point. You know a pressure cooker lets the water inside get above 212F so it will cook your food faster. You also know your jiggler adds 10 PSI - so that liquid won't boil until it gets over 240F. Not enough heat you won't have enough pressure to jiggle, and too much heat the jiggler will constantly blow off steam. When you have an occasional jiggle, you know you balanced your heat perfectly.

@tomswinburn1778

5 жыл бұрын

@UCvYZV2LLaSNyE2QpFQMfLKA Ya just did it. And in a fashion almost anyone can understand. Only thing I could add is that pressure has much to do with the temperature. High pressure boiler/low pressure boiler. Superheat being the prime example. Heat continues to rise beyond the boiling point (change of state) with the vapor contained.

Nice job ACSERVICETECH. I want to ask if you could help me understand the bubble point and dew point on the pt chart. I though I understood it but then I read something today and I am back to scratchin my head. Thanks again.

@acservicetechchannel

8 жыл бұрын

I may do a video on that in the future but for now here is a good reference. Thanks

@Pretzel114

8 жыл бұрын

Hey ACSERVICETECH, thanks for the reply. Not sure if you had a link in there for the reference, but nothing came through on my end? Thanks again.

@acservicetechchannel

8 жыл бұрын

Nice, here it is- www.refrigerants.com/pdf/RSES%20Article%20Part%203%20Mar06.pdf

@Pretzel114

7 жыл бұрын

Awesome!!! thank you so much. This is great!

good job

@acservicetechchannel

7 жыл бұрын

Thanks Thermocom!

Also in TN the weather goes from 35 to 70 f then back down to 30. Does that mean in order to avoid liquid getting into the compressor the superheat must be adjusted on a daily basis?

@acservicetechchannel

6 жыл бұрын

check out this refrigeration cycle playlist and look at the basic refrigeration cycle one. This is a heat pump. The charge in the unit does not have to be changed, thanks- kzread.info/dash/bejne/jH6Gl9R9gLqyoKQ.html

So you need wetbulb reading for superheat? Just got Field piece probes, will they not give me super heat unless I use the psychrometer…..which I don’t have.

So if you have a piston you check the superheat in order to see if the system is low or over charged. Then you use the chart to correct it. But if you have a txv then you only use sub cooling right?

The wet bulb is that the evap coil sensor?

Ok I understand but how do you adjust on the gauges

Are these Delta temperature measurements also useful or possible in an automotive air conditioning system?

@acservicetechchannel

7 жыл бұрын

In a car, the compressor will be ramping up and down with the engine but may be around twenty degree temp diff with the condensor fan is on at park. In a single speed compressor for a building the delta T is known. I don't work on cars that much, thanks!

i have a lennox R22 system in my house with TXV on the indoor unit. im getting 15.5° of subcooling with an outdoor temperature of 68°, High side was 149, low side was 44. Is this subcooling within range?

@acservicetechchannel

7 жыл бұрын

For the target subcooling, you usually can find it on the rating plate. If this is wore off then usually set it to 8-12 degrees of subcooling. I usually go for 11 degrees and then check for 18-21 degree temp decrease between the return and supply duct. Thanks

hi friend i want to make homemade -30 degree freezer what i need can i use r134a ? and which compressor i need

For "vessel AC "can I use subcooling metod ?

So everyone using AC unit will need their superheat adjusted when the outdoor temperature changes? So every summer and winter heating cooling users are guaranteed a visit?

@acservicetechchannel

6 жыл бұрын

Superheat will change on it's own if there is a piston or capillary tube used as a metering device. The refrigerant charge should never have to be changed by a tech unless there is a leak, thanks!

Thanks man helped me out alot! But on superheat and subcooling say if you have a 30 degree sh i know its undercharged but wouldnt that mean itll actually do better because your picking up 30 degree difference of hot air going across that evap? And same question just reversed for subcooling

@acservicetechchannel

6 жыл бұрын

Hey Menitojr, 30 degrees of superheat depending on the wb inside and outdoor ambient temp could be an accurate charge. Look up "acservicetech superheat chart". So the saturated state will store much more heat than in boiling or in liquid state so the more sat stat meaning the less superheat, the more efficient heat absorption. The problem is that with a piston metering device, we need to make sure the compressor is safe and has superheated vapor regardless of the indoor wb or outdoor temp day so we set superheat with a chart, app, or calculation, thanks menitojr!

@menitojr6066

6 жыл бұрын

AC Service Tech LLC aha makes sense! Thank you so much your videos help out alot. Ever think about making videos on chillers and boilers?

@acservicetechchannel

6 жыл бұрын

I have a lot of thoughts and things I would like to be able to make. One thing at a time though, thanks!

Can you explain the process of finding saturation temperature to minus it from the evap outlet to find the super heat

So there's only one two times when there is saturation, being in the evaporator and condenser right?

@acservicetechchannel

6 жыл бұрын

While running yes, that is correct. The efficiency has to do with how large those saturated states are but they must phase change out of the sat state before leaving evaporator and the condensor, thanks

We need superheated to prevent liquid slugging but when we charge a unit with 410a we have to charge into suction port with liquid only? Thats pure liquid going right into the compressor.