R-410A AC Unit Checked with Superheat: 4 Scenarios, Low Charge through Overcharged!
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- Опубліковано 7 сер 2020
- In this HVAC Video, I Show SEVERELY UNDERCHARGED, UNDERCHARGED, CORRECTLY CHARGED, and OVERCHARGED Scenarios on a Running R-410A Refrigerant Air Conditioner with a Piston Metering Device While Checking the Charge with Total Superheat. I Adjusted the Refrigerant Charge Level 4 times and Checked the Charge 4 times. Supervision is needed by a licensed HVACR Tech while performing tasks as Experience and Apprenticeship garners Wisdom and Safety.
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When I refill R-410A according to target subcooling, but suction line pressure is still at 90s, which means saturation temperature in evaporator below 32F. To avoid a frozen evaporator and suction line, I’ve to continue refilling refrigerant and take target subcooling aside. What’s wrong with the system? Thank you very much
@@lidong8599 WOW! do you even know the concept of how to read the gauges at all?? or how a system works!
Paper book should include ebook. Decided not to buy it for this reason.
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!
Absolutely the best video out there explaining system charging. Those new (and some seasoned techs) should definitely watch this video. Thx Craig.
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!
Damn dude these videos are so helpful for people starting out in this trade. Please keep them coming!
A big thanks to you. I've learned a lot from your channel and have saved a lot of money doing the work myself.
Love the cards, ordered mine and was surprise how well made they are, with large print but small enough to tuck in a bag.
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.
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.
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.
Best HVAC videos on yt for learning. I've learned things and I have 22 years experience
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.
Definitely Sharing this with all my friends. such a well constructed information.
Excellent video! Clear, logical explanation of each scenario. Much appreciated. 😊
You explain really good. I already know how to calculate superheat and subcooling but I just wach your videos just to refresh my knowledge.
Great to hear!
Another great video Craig! Awesome job once again.
Thank you for your support!
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!
Great video Craig. Keep them coming.Merry Christmas in advance.
Happy holidays!
Excellent, educational video. Well done, all the important info covered without wasting time. Thanks
Glad it was helpful!
Thank you. I had learn a lot from you channel.
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 job as always.
Thank you Craig.
Thankful you are on UA-cam
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
Thank you sir I have learned a lot now how to charge system correctly
Thank you Greg for sharing! you are awesome!!!!.
Thank you for your support!!
Great content as always
Good morning thank you from South Africa
thank you for making another great video
Thank you for the support!
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.
Well said Sir .
You did good explain! Thanks
Thank you for your support!
Great video you the man
You are a blessing
Hellaaa nice like iceee. Love it
awesome info.
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 .
Very good video and content.
Thank you for watching!!
Great Video. Have a nice weekend. Thank you for sharing ^_^
Thank you for your support!!
Excellent video. I think I’ve got it now..
Glad it helped
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?
Good job
Thank you!
Nice !
Thanks
Great video and explanation, wish you had same vid with TXV
I may do one like that this summer, thanks!
@@acservicetechchannel Me as a DIYer wouldn't be able to appreciate it enough! I'd rather (and did) spend some money on tools and time to understand superheat, subcool, deltaT, temperatures, TXVs, orifices, ...and relationship between all of them! ...at the times when you almost have to take out another loan to pay a guy who may just scam you (slightly exaggerated ...maybe)
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.
I need to buy that book
Melchor, its available at www.acaservicetech.com/store and on amazon thanks
Great video! Could you demonstrate on a TXV system?
That would be a great video too!
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.
Do these tips work on a package unit as well
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!
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
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
7:07 Hi and thank you Craig. I got a quiestion. Where does the formula for target overheating come from?
Have you made a video on charging an inverter system?
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?
Question can you get a wet bulb reading by holding it at the register or vent?
I wonder if this is good for checking smaller refrigerant units. Like prep tables or two door uprite freezers??
could this be applied to ductless/split type inverter units?
The thumbs down, must be the guy who can't understand the concept.
That is the only reason why someone would dislike this video... It is factually correct and explained even better/simpler than I was taught.
Or he was half asleep and his thumb hit the thumbs down button.. It's happened to me before 😂.
The guy that still uses the beer can method.
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 ?
Please kindly indicate temperature unit in your video. I will like to no if the unit is in °F or °C?
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.
Craig does this stand for a unit where the compressor and fan aren't working at moment because it keeps cutting on and off
Super
Does the cases scenarios are the same with refrigerant R33 ? Should we act the same way as the R410A ?
For the 1st scenario your talking about can't it be a liquid line restriction?
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
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?
Can you get the same symptoms if it was a txv? Sh high vapor sat is low and vapor line temp is high?
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.
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.
Do you mean total superheat should equal or approximately near target superheat in a correct charged system?
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
We have quite a lot of Canadian customer that buy through our site and on amazon. Its #1 in amazon.ca and #2 in amazon.com book category of heating ventilating and air conditioning and the full outline and sample pages are on the site at www.acservicetech.com/ac-book thanks!
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?
I don't have that temperature Meter so it's going be hard to do that calculating
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
look up the check charge app. it will ask step by step and it will calculate your charge.
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
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
If it’s for your house you can use a 5-2-1 or even a Supco spp6 for a lot less money.
What is wet bulb temp?
Where do you measure the wet bulb temperature with a mini split?
My guess would be the (ambient air) near by but. Don’t take my word lo I’m fresh out of school lol
With this work with a LG mini split ????
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
I’m looking thru your book now lol
Dan Martens overcharged. Recover to bring up SH and lower SC. Temp drop is low so I wouldn’t start there until I saw the effect of the recovery. Need to know what ur shooting for though.
If you have no superheat, and .2 is so low it could be 0 with a little calibration error, you are so overcharged you are starting to flood back liquid to the compressor and are in danger of killing it.
That's the problem I always run in to my self. I rarely can ever tell if i have a txv or piston. Sometimes I can't get access to see the coil due to the plenum. So idk if i should be doing by sh or sc.
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 you know target superheat is higher than 10 for this unit?.
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?
He doesn't reply unfortunately
raul robles I just figured that out after my 2nd comment lol.
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?
You control the valve. Use a scale to monitor how much you are removing.
👍👍
why is 10 to 12 degrees important if you need to use super-heat for pistons
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?
raul robles you have to take it apart and look
@@mwatkins2464 there has to be a easier way
raul robles how come you can’t see your evaporator?? Are you talking about a package unit or a split unit. Either way you have to take a few screws out to be able to see.
@@mwatkins2464 talking about the evaporator on top of the furnace. I always have some that are closed good. I feel like I would have to cut out a hole to see in but I feel like there is another way to know without doing all the extra work
raul robles you shouldn’t have to cut anything unless someone did a hack job on it. Just follow your copper tubing where it goes inside the unit. The metering device will be on the small tubing. You should have some 5/16 screws to take out if yours is a split unit.
👍🏾👍🏾👍🏾
How much psi is low level and standard psi level one more how much psi we need to charge
there is no standard. your subcooling and superheat or a charging chart will guide you.
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 have a unit and the saturation temperature is higher than the suction line temperature, why is that?
What type of metering device?
You need to give more information. What type refrigerant? Metering device?
The unit is a new installation, R410A 1.5 ton Run Tru by Trane, new lines and New 1.5 ton evaporator with a piston, air coming out of the closest vent is 62 F, my pressure an Low side is 151psi, my saturation temperature is around 52 degrees but the temperature at the low side is 60 degrees, I learned at school that is supposed to be all the way around, I do not understand, please comment, I am new on this field 🙏🙏🙏
Salvador Gonzalez usually the saturation temperature is lower than the actual low side pipe temperature at the condenser. If you were to measure the temperature at the outlet of the evap coil, it would probably be a couple of degrees cooler than when it gets to the condenser. If you did a proper vacuum and you have a piston, Make sure your charged the unit according to the superheat charge base on the wet bulb of the house at the nearest return grille. Compare with a SH table. When there’s a high heat load, the temperature of the pipe won’t be as cool but as the unit runs and removes the humidity and heat load it will get cooler. Make sure your superheat is correct.
Do you have a psychrometer (sling, digital, or thermocouple with sock) to measure indoor wet bulb temp? In order to get your charge correct you need to find out what the indoor wet bulb temp is. Here's a helpful formula to calculate target superheat: indoor wb x 3, minus 80, minus outdoor ambient temp, divided by 2.
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!!
I hate the digital Field thermometer. It’s a trash. Not right reading
Efn.
Jesus man get some digital gauges lol.