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Wow ! I was in the refrigeration trade for 42 years before I retired in 2005. I must say things have really gotten much more complex. With your instructions,I am in the process of installing 3 split heat pumps in my home. One is in and two are on schedule for spring. A good refresher course is always welcome! O yes, I did order the guidebook and the q cards to help if a get into a bind. THANKS for your help.🤠 Yes I'm doing all the work myself. I'm only 78 young...

I've had my license and been doing HVAC off and on for property management since 1992, I must say this is the best instructional video for superheat and sub cooling I have ever seen. In the old days we charged to pressure charts and outdoor temps.....Great job on the video!

Damn dude these videos are so helpful for people starting out in this trade. Please keep them coming!

Absolutely the best video out there explaining system charging. Those new (and some seasoned techs) should definitely watch this video. Thx Craig.

Just received my refrigerant charging and service procedure book. This book is awesome!! If you want to expand your knowledge and understanding, I encourage you to purchase this book. Knowing your trade in depth sets you apart from those that are comfortable with having surface level knowledge.

Best HVAC videos on yt for learning. I've learned things and I have 22 years experience

You explain really good. I already know how to calculate superheat and subcooling but I just wach your videos just to refresh my knowledge.

A big thanks to you. I've learned a lot from your channel and have saved a lot of money doing the work myself.

Thank you for the video. It is nice to see the different charge scenarios in one place. I am constantly learning even though I am an amateur. I can do any diagnosis and repair that a professional can do. Just recently replaced a bad TXV valve on my central AC unit. No problemo!

Hi Craig: This video was a great summary of the most common scenarios. People should still watch the individual videos or better yet, BUY THE BOOK! It was the best learning tool for me. Thanks again.

I’m in school for hvac and just had to spend a ton on money on tools and a fluke meter. Hopefully get a copy your book one day!

Excellent video! Clear, logical explanation of each scenario. Much appreciated. 😊

Love the cards, ordered mine and was surprise how well made they are, with large print but small enough to tuck in a bag.

Excellent, educational video. Well done, all the important info covered without wasting time. Thanks

Excellent job again as usual. I was very happy to see the Delta T explained. If you haven’t purchased his book and other literature you need to do it. I own his spiral book, quick guide charts, and his HVAC tables equations and rules of thumb quick cards. The last job I did has already paid for these.

The thumbs down, must be the guy who can't understand the concept.

Thankful you are on KZfaq

Well explained with all 4 cases. I have the e book but definitely looking forward to buy the hard copy. Thanks for sharing and putting so much effort.

Another great video. I did receive my Accutrak Ultrasonic leak detector last week. I love it. Quicker than my H10. Love them both. Thanks for sharing.

I just want to say that i work maintenance for an apartment complex and recently got my 609 certification . I bought your book a few months ago ago and for reference i read it all the time. Great book . And i love the reference cards . I use them daily . Great video as well. Keep up good work . Buy the book . Read it often, this will all start to make sense .

Hey Craig thanks for all that you do for the hvac community I'm a young aspiring tech CAN U MAKE A VIDEO EXPLAINING WHATS CAUSES HIGH SUCTION SATURATION TEMPS AND LOW SATURATION TEMPS .IM REALLY TRYING TO GRASP THAT CONCEPT .AGAIN THANK YOU

Definitely Sharing this with all my friends. such a well constructed information.

Great video Craig. Keep them coming.Merry Christmas in advance.

Another great video Craig! Awesome job once again.

Thank you. I had learn a lot from you channel.

Thank you Craig.

You sir are great service tech teacher! But unfortunately i rarely do that on the field if i have 10 calls a day in hot summers, simply not enough time to do that. Like always 👍 detailed video

Good morning thank you from South Africa

Thank you sir I have learned a lot now how to charge system correctly

Great content as always

Hello Craig Thank you very much for sharing Would you please share with us where should we take the wet bulb temp on a digital psychrometer such as UEI one?

Excellent video. I think I’ve got it now..

Great video and explanation, wish you had same vid with TXV

Thank you Greg for sharing! you are awesome!!!!.

I need to buy that book

You are a blessing

could this be applied to ductless/split type inverter units?

You know funny thing is, I watched a building maintenance guy recharge a R22 system at my complex back in 2015 in Austin, TX. He didn't do any of this subcooling or superheat calculation with temp probes everywhere. In fact I didn't even know there was this whole thing about subcooling or superheat. He simply charged it to the right pressure and left it at that and the system worked fine. I would assume he's licensed as every AC units at the complex is R22 systems... no way he'd be hired as maintenance guy if he wasn't licensed to do R22. But in Taiwan there is NO regulation on HVAC. We could buy R22, even R12 over the counter here! And none of the AC guys I talk to here are ever licensed or even heard of a license.

Please kindly indicate temperature unit in your video. I will like to no if the unit is in °F or °C?

You did good explain! Thanks

Great video! Could you demonstrate on a TXV system?

Good job as always.

I wonder if this is good for checking smaller refrigerant units. Like prep tables or two door uprite freezers??

7:07 Hi and thank you Craig. I got a quiestion. Where does the formula for target overheating come from?

Do you mean total superheat should equal or approximately near target superheat in a correct charged system?

Do these tips work on a package unit as well

Have you made a video on charging an inverter system?

Well said Sir .

Thanks

Sir , I respect all of your education about AC gas charging methods, but I want know one thing , R410A , R22, and etc about Ac gas , how much standard gas psi level, how much we need to charge with psi level ?

Enjoy your videos and have gotten good use from your book and reference cards. Have a couple questions.. maybe you have videos already.. 1. I've noticed with condensers that have a microchannel coil than the manufacturer doesn't seem to specify a subcooling. And when following the manufacturer instruction to just go off their pressure and temperature chart for liquid line I end up with a SC that was far higher than I would had if I was just going off SC alone. So wonder if you can explain this or show the proper way to check equipment with microchannel. 2. Other question is what is the best practice for checking refrigerant charge on a system/circuit with more than one compressor? I've seen some equipment (actually back to the microchannel) where their temp pressure chart was based on both compressors in operation. Some older equipment not using microchannel coils that have 2 or 3 compressors I'm wondering if I can simply operate one compressor at a time and check charge. I suppose the charge on one would be good on the other.. however checking these individually is good validation that equipment is working. Just curious what common practice is for this. Thanks!

thank you for making another great video

awesome info.

Great video you the man

Great explanation. What is the model of the temp probe and meter used on the suction line and liquid line??? Did not see it in the catalogue. Thanks for the great video's.

Sir I am in HVAC field for the last 35 years. Well I get scared while working on R10a unit for the fear of getting it exploded. On what condition the R410a will blast. Thanks

I only check the WB or DB on r-22 but I am at high altitude and we don’t check those measurements on 410A but that is curious, might have to give it a try.

Very good video and content.

Craig does this stand for a unit where the compressor and fan aren't working at moment because it keeps cutting on and off

How can you tell if someone charged a system with 410A with vapor? I have a system that I think was charged with a gas not a liquid. And if I'm right this system would need to be recovered?and if they did do that the jug of refrigerant would be junk ? Thank you for the video.

Great Video. Have a nice weekend. Thank you for sharing ^_^

Your target superheat chart goes up to 76 degrees for a wet bulb reading. If my AC was malfunctioning at 76 degrees, why would I use the chart to match that?

Does the cases scenarios are the same with refrigerant R33 ? Should we act the same way as the R410A ?

Where do you measure the wet bulb temperature with a mini split?

Question can you get a wet bulb reading by holding it at the register or vent?

Hellaaa nice like iceee. Love it

For the 1st scenario your talking about can't it be a liquid line restriction?

How to calculate this if the AC has "winter mode" installed - the condenser fan spins depending on the temperature of the condenser (so it can spin at normal speed, slow or not at all). Would that affect the "outside temperature" in the calculation?

hey, Craig i like all your videos i'm wondering if you have any coarses that I can take online? In the mean time I would like to know how to callibrate the preasure of the manifold SM380V

Super

Hey Craig; what the subcool in a package unit for a light comercial system ? I was told that i have to put the panel back for the pressures to lower

I’m fairly new to residential HVAC. Installed a new unit. These units come precharged for a 15 foot line set and the existing line set is only 8 feet, does this mean I need to recover some of the charge? It seemed to be overcharged just by checking the gauges. I recovered some refrigerant which lowered my Head pressure but had no effect on suction pressure. I can not get evap coil temp below 55 degrees. The house will not cool down below 77 when it’s warm outside. It is a 410a piston system.

Good job

Can you get the same symptoms if it was a txv? Sh high vapor sat is low and vapor line temp is high?

How you know target superheat is higher than 10 for this unit?.

Hi Craig, Are you aware if your book is applicable (or at least similar to) canadian hvac procedures? Do you think it would be worth buying even if the codes are dissimilar? Thanks, Mike

hi for AC windows i refill using R290, is it better lower or higher supeheat for efficiance? Ex: superhear of 15 is it better that 10?

What is wet bulb temp?

With this work with a LG mini split ????

I don't have that temperature Meter so it's going be hard to do that calculating

If i had 143 psig in my vapor side with 16 sh and my vapor line was 67 degrees and saturation was 50. Liquid pressure was 365 and sc was 8.3 and liquid line temp was 101 and saturation at 109. Was I fine with my charge? It was degrees outside and my wet bulb waa 74

Hello i have a problem with r410 ac unit1.8btu Plz help. The suction ia is ok 120 ans pipe also cold. But at evening time when is too hot between 12 pm to 7 pm. The unit is not cooling well the blow air is week. At night its ok. What the probl m. Plz help

how do u feel about the 'hyper engineering' and 'micro air' soft starter kits. they claim to lower startup inrush amps by 1/3 to reduce loud compressor startup thud and eliminate indoor light flicker? they cost about $300. great vids btw

Nice !

why is 10 to 12 degrees important if you need to use super-heat for pistons

My contractor charged me $250 and did none of this, besides connecting the guages. Then proceeded to tell me my compressor was faulty and needs replacement, $6K. Where can i find a honest contractor who will diagnose a Heat pump that wont cool or heat and proceed to fix the issue?.

I overcharged a system and want to remove a small amount of refrigerant. My recovery tank is under a vacuum. Will this cause to much to be pulled out?

What do you do when you don't know what metering device the system is using? Sometimes you don't have access of looking at the inside coil so how can you know what metering device the system has?

I have a Fieldpiece clamp meter with the k-type. How to do you attach the piece of fabric to the k-type to get the Indoor WB temp?

I still struggle with superheat and subcooling. I'm fine with wiring , duct work sheet metal, brazing etc but when it comes to checking proper charge I struggle. I'll have to watch this a few more times.( i have a fixed piston) If my outdoor temp is 77deg indoor house temp is 74 any idea (ballpark figure) what my outdoor pressures would be? Does 125psi and 300psi seem right. I'll have to do superheat. Then check subcool. Thanks for the video

Great video I’m working on a system now that has sh of .2 vapor line at 70 Psi and sc 32 liquid line 293 psi and a temp split 14.1. R22 not sure if it’s a txv or piston as I’m going to cut case now. I’m thinking airflow? Any thoughts

WHY is it that newer systems don't install a sight glass in the liquid line?? Cost can not be a factor surely! I have a Goodman 2 1/2 ton heat pump on R22 and it,s been fantastic for 13 years now. Yea I do all the pm checks. For I installed it in 2011. Older units are so much simpler to solve problems on than newer units. Much too much electronics. Wait until there is a big electrical surge. Think of all those circuit boards!!

How much psi is low level and standard psi level one more how much psi we need to charge

I have a unit and the saturation temperature is higher than the suction line temperature, why is that?

I hate the digital Field thermometer. It’s a trash. Not right reading

👍👍

Jesus man get some digital gauges lol.

👍🏾👍🏾👍🏾

Efn.