Why use Subcooling for TXV's & Superheat for Fixed Orifices? Refrigerant Charging!

In this HVAC Training Video, I Explain Why we need to Measure the Refrigerant Charge with Subcooling when a TXV Metering Device is used. I Explain why the Total Superheat Method is used when the System has a Fixed Orifice such as a Piston or Capillary Tubing. These Charging Methods refer to Air Conditioning Systems with a Single or Two Speed Compressor. Supervision is needed by a licensed HVACR Tech while performing tasks as Experience and Apprenticeship garners Wisdom and Safety.

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⚠️ Disclaimer:
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. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
#hvacr #hvacr #hvactrainingvideos #hvactraining #hvactraining101 #acservice #acservicetech #refrigerants #TXV #subcooling #superheat #explained #airconditioner
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[eablau]

Bravo! The best presentation of the subject matter I have ever seen - short and to the point! And the visuals on the side, A-coil and condenser made that easily understandable for everyone.

[primusheating]

Hands down Craig you are the best. Any young tech I know that is entering the field I always suggest to check your you tube channel as a supplement to any other education they are receiving in the HVAC field. I love coming to your channel as refresher because you really make it easy to understand for anyone. We love you man. Keep up the good work and stay humble.

[hvacdoc]

Great explanation !!
I’ve been in the field for nearly 30yrs. and really enjoy and appreciate your videos !

[Matthew-jrxr]

Your videos are 2nd to none man. Much appreciated

[bobwhitfield]

Your an awesome teacher and I appreciate you. These are perfect refresher courses to watch through school! Thanks from Las Vegas !

[Preludeddrivers]

Boy you are a bad man!!! loads of useful and CORRECT info Bravo, Bravo!!!

[brucegreen]

Craig is a beast! Man, I have learned so much from you and your channel. The AC SERVICE TECH BOOK is written very well and is easy to understand even if your a noob like me! Thanks Craig!!

[ApartmentMaintenance]

Great video Craig, love my quick reference cards 👍 Definitely worth the 20 dollars, I keep them in my Veto bag, & using them to help train my 2 techs.

[tntheatingandairllc]

Great video buddy and the reference cards are the best I just received mine yesterday 👍👍

[peterdunai]

That's what I call teaching. 10/10

[carloscarrillo]

Great for explanation! Thanks for technical information..

[wasimedoo]

Nice explanations very good information thanks bro keep it up

[mematyi]

Great video!
I'd have a question if you don't mind:
When you check the charge with a TXV, based on the subcooling method, it is assume that there is no liquid reservoir in the system?

I recently passed the commercial refrigeration course here in Europe, but I was taught to look up the capacity of the liquid tank and target a 75% refrigerant volume in the total reservoir size, if you are charging a new system. A TXV without a liquid reservoir is unknown to the books.
We have quite different service education and habits, regulations here in Europe(with all the funky new refrigerants), but many service/measurement methods you describe are new to me, even though I passed with an Excellent grade. It seems that the american school of refrigeration service is a bit more technically developed.

[proc]

Sir, I have watched your last two videos on superheat and sub cooling. I need to go back and rewatch the last video as I will be starting an apprenticeship in about two months. I think I have a basic understanding but I need to go back and learn more now that I have a basic idea. Please correct me if I am wrong: superheat is the number of degrees that a liquid is above its boiling point (or during a state of change) and sub cooling is the number of degrees that a liquid is below its boiling point (or during a state of change). Again I’m trying to learn so please correct me if I am wrong or clarify and mistakes. I appreciate any responses from people who can help me understand this topic more! Thank you!

[kamechanicalhvac]

Great video is it possible in the future to make video on water cooled
units . Cooling tower, condenser water pumps, here in NYC we work on alot of water cooled heat pump ..

[joeshmo]

I like the explanation of where to expect all gas at the top of the evaporator A coil. Could you do something similar with condenser coils comparing an older condenser coil that has a receiver tank and a newer oversized condenser coil without a receiver tank?

[puravpatel]

Thanks a lot for the video, Craig. I have been reading your book, which is also great. I had a doubt about what happens to the subcooling incase of a fixed orifice. Will the subcooling remain constant (upon adding or reducing the charge) when we have a fixed orifice as the metering device? Also does having a receiver in the liquid line have any effect on the value of subcooling?

[hvacpower]

Great video. Now I have a normal superheat 12° and 0° sub-cool on a fixed orifice. What can be causing this. Wrong size piston?

[anoopkravi]

Hey Craig, been your follower for long. Such nice presentation and great knowledge in refrigeration. I am basically from United Arab Emirates, i wonder how to order your book and cards locally here in the market? If I purchase online, will it get delivered here in UAE?