Fast Check for a Very Low Refrigerant Charge on an A/C Unit!
HTML-код
- Опубликовано: 1 авг 2024
- In this HVAC Video, I Show How to Quickly Measure if a System is Very Low on Refrigerant (Undercharged). You don't need to melt the ice on the evaporator to measure if the system has lost most of its charge. We can use subcooling regardless of the metering device when subcooling is low. If the unit is off, you don't need to turn it on to tell if it has lost 7/8 of its full refrigerant charge! We can use the surrounding air temp and compare it to the refrigerant's saturated temperature! Supervision is needed by a licensed HVACR Tech while performing tasks as Experience and Apprenticeship garners Wisdom and Safety.
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Our Related Videos/Articles
• Saturated Refrigerant ...
• Total Superheat Method...
• How to Find a Refriger...
• Easy and Quick Way to ...
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Our HVACR Educational Books, E-Books, Workbooks, Cards, Posters, and PowerPoints:
All Our Educational Products on Our Site: www.acservicetech.com/store
All Our Educational Products on Amazon: amzn.to/48pDd82
Mini Split Book and E-Book on Our Site- www.acservicetech.com/mini-sp...
Mini Split Paperback on Amazon- amzn.to/3ytHJSs
Mini Split Paperback on TruTech Tools- www.trutechtools.com/BooksGui...
Refrigerant Charging Book and E-Book: www.acservicetech.com/ac-book
Refrigerant Charging Paperback on Amazon: amzn.to/46xTeHf
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Our HVACR Online Resources!
Our HVAC Calculators: www.acservicetech.com/hvac-ca...
Our Newest Articles: www.acservicetech.com/articles
Try our HVAC/R Quizzes! www.acservicetech.com/quizzes
Our Other Resources: www.acservicetech.com/resources
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Tools Used in Our Videos!
Tool Links on Our Site: www.acservicetech.com/tools
Our Tool List on Amazon: www.amazon.com/shop/acservice...
Support the Channel by purchasing tools through TruTech Tools!
Use this link www.trutechtools.com/?aff=8
Save 8% at checkout using code "acservicetech"
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Follow Us On Our Social Media & Podcasting Channels!
Patreon: / acservicetech
Facebook: / acservicetech
Instagram: / acservicetech
X: / acservicetech
LinkedIn: / ac-service-tech-llc
Tiktok: / acservicetech
Spotify: open.spotify.com/show/74KXLz5...
Apple Podcasts: podcasts.apple.com/us/podcast...
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
⚠️ 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 #refrigerant #low #measure #undercharged #charge #acunit #techs #hvactechnician
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Shop through Amazon! Your Purchases through Amazon provide a means for channels such as mine to earn advertising fees from all purchases after clicking through. Prices are the same as normal.
My Paperback, E-Book, Workbook, Quick Reference Cards: www.acservicetech.com/store
E-Book: play.google.com/store and search "AC Service Tech"
My Paperback and Quick Cards: www.amazon.com/shop/acservicetech
Support the Channel: www.patreon.com/acservicetech
Tool List: www.amazon.com/shop/acservicetech
Follow and Like our page on Facebook to get unique content and updates posted every other day!!
facebook.com/acservicetech
Related Videos:
Saturated Temp Basics, P/T Chart, Reading the Gauge Set: ruclips.net/video/FKyGuHKUNpo/видео.html
Total Superheat Method for Fixed Orifices: ruclips.net/video/s9I1aVugdkY/видео.html
Finding a Refrigerant Leak with an Ultrasonic Leak Detector: ruclips.net/video/h60yatrnuPc/видео.html
Easy and Quick Way to Check A/C Refrigerant Charge: ruclips.net/video/eI_neAZkKYw/видео.html
Checking the Charge Tools:
Yellow Jacket Refrigerant Gauge Set amzn.to/2aenwTq
Refrigerant hoses with valves amzn.to/2aBumVI
Yellow Jacket Gauge set & hoses amzn.to/2vLVkV9
Yellow Jacket 4 Port Manifold w Hoses amzn.to/2BkuGIq
Digital Refrigerant Scale amzn.to/2b9oXYl
Ratcheting Service Wrench amzn.to/2dGV4Nh
FieldpieceSMAN360 Digital Manifold Set amzn.to/2BdoaD4
FieldpieceSMAN460 Digital Manifold Set amzn.to/2nB4Fe6
Compact Ball Valve for Refrigerant Hose amzn.to/2KUisW8
QuickDisconnect 90 for refrigerant hose amzn.to/2MMtVcg
RectorSeal Bubble Gas Leak Detector amzn.to/2ckWACn
Fieldpiece ST4 Dual Temp Meter amzn.to/2wc1ME3
Fieldpiece Bead K Type Temp Sensor amzn.to/2DBwKfs
Fieldpiece Wet Bulb Temp Sensor amzn.to/2RRI7Tw
Fieldpiece TC24 Temp Clamp amzn.to/2qHLyjZ
Electrical Diagnosis Tools:
UEI DL389 Multimeter amzn.to/2xAdaJf
UEI DL479 Multimeter with temp sensor amzn.to/2jtsUbJ
Magnet Jumpers- amzn.to/2PyKPQZ
Alligator Jumpers- amzn.to/2PxqJXn
Irwin Wire Stripper/Cutter/Crimper amzn.to/2dGTj2V
Vacuum Tools:
JB 6 CFM Vacuum Pump - amzn.to/2nqbvo8
CPS 4 CFM Vacuum Pump - amzn.to/2DxgPwY
1/4" Appion Valve Core Removal Tool - amzn.to/2uYr8WL
5/16" Appion Valve Core Removal Tool - amzn.to/2JHmfbP
Appion Blue 3/8" to 1/4" Vacuum Hose - amzn.to/2uYlVyc
Appion Red 3/8" to 1/4" Vacuum Hose - amzn.to/2uYg6Ro
Yellow Jacket 1/4" by 1/4" 3’ hose - amzn.to/2umtcod
Appion 1/4" by 1/4" and 3/8” hose - amzn.to/2Zyxzx9
Uniweld 1/4" by 1/4" 2’ hose - amzn.to/2GFov1Y
CPS Vacuum Micron Gauge - amzn.to/2v1nM3O
JB Vacuum Pump Oil - amzn.to/2mGrlXy
Flaring Tools:
Yellow Jacket Flaring Tool - amzn.to/2OBxGlM
Spin Flaring Bits 1/4", 3/8", 1/2", 5/8", 3/4"- amzn.to/31BCs8Z
Yellow Jacket Flaring Tool with Set Depth - amzn.to/2QIKsQH
Yellow Jacket Torque Wrench - amzn.to/2NRR68Q
Uniweld Swage and Flare Kit- amzn.to/2T55jyn
Nylog - amzn.to/2MLJcch
Ridgid Tubing Cutter - amzn.to/2DnjjR1
Wolverine Tube Reamer - amzn.to/2QGLyMV
Swaging Tools:
Manual Copper Tube Swage/Expander- amzn.to/2WRPa1M
Spin Swaging Bits 1/4" to 7/8" for the Drill- amzn.to/2YQwwqS
Uniweld Hydraulic Swaging Tool- amzn.to/2MlrI8m
Uniweld Swage and Flare Kit- amzn.to/2T55jyn
Uniweld Hammer Swage kit- amzn.to/2CzWMMU
Uniweld 3/4" Hammer Swage- amzn.to/2CzXsSs
Uniweld 7/8" Hammer Swage- amzn.to/2Mja5WE
Uniweld Multi-Size Hammer Swage- amzn.to/2T3Cx1b
Brazing Tools:
Air Acetylene Torch setup - amzn.to/2aQalsb
15% Silver Brazing Rods - amzn.to/2gVLyLc
Ameriflame Oxy Acetylene Torch Setup #1 Tip - amzn.to/2SRm3JF
40cu B Tank to 10cu MC Tank Acetylene Tank Fitting - amzn.to/2GxZZPi
Nitrogen Regulator - amzn.to/2bXdR5f
Uniweld NitroVue Flow Regulator - amzn.to/2GnsaAo
Uniweld Nitrogen Flow Meter - amzn.to/2brvoBg
Stay Brite #8 Silver Bearing Solder and Flux - amzn.to/2XIDJsY
Aluminum Braze Rods - amzn.to/2IGNMu
Refrigerant Leak Detection Tool:
Accutrak VPE Ultrasonic Leak Detector amzn.to/2nFYKVe
Shop through Amazon! Your Purchases through Amazon provide a means for channels such as mine to earn advertising fees from all purchases after clicking through. Prices are the same as normal.
Wow this video is like on another level IMO. Thanks Craig.
These videos are aging like wine. Sorry, I am 3 years late, but still appreciate the information and delivery. Well done ac service tech team.
Direct to the point with no fluff. Thanks Greg. Much appreciated! And folks, GET THE BOOK! You will be glad you did!!!
Thanks a lot Ma Ma! I really appreciate you taking the time to write that!
I appreciate you being so thorough with everything you teach. I just bought your workbook. I went to school to get my epa universal and achieved that. I've learned more from you then many others
I really appreciate you taking the time to let me know, thanks!
You are the best in teaching HVAC on the web thanks for info
Thanks a lot Ken!
That’s why I have owned a refrigerant identifier since 1994 you would not believe how much contaminated refrigerant there is out there either mixed with other refrigerants or high percentages of air.
Awesome! thanks T lech!
I learn something new every day. Thanks craig.
Glad to help Dylan!!
Love how simple to understand you made this video.
Glad you think so!
Looks good. The only thing I do above this, is an additional ball valve that would fit between vac gauge and machine port. The purpose being to do an immediate pump and gauge test within the first couple of minutes. I get to see my gauge drop right below 50 or even 20 micron. Not just 500.
Helps test the hoses for leaks also
Thank you, this is very straightforward and understandable
Glad to help Blue-Collar Biceps!!
Special Thanks to Brandon for all the editing and design changes to make this video possible!
We are now on Facebook! facebook.com/acservicetech
Follow and Like our page on Facebook to get unique content and updates posted every other day!!
Excellent Craig. Love the graphics.
Thanks a lot Chris!
Another great video with tons of great information. Thanks very much!
Thanks a lot Ron!
Nice video love to show this to our new rookie who's just started not to long ago 👍🙏😎
Awesome, thanks!
Thank you.
Glad to help Chip!
Thanks Craig! on point as always lol!
Glad you enjoyed it Marcus!
I like video for you. It helps me to understand more knowledge.
Glad it helped!
Your the best for this one thanx a lot
Glad to help
Another great video sr thank
Thanks Jose!
Good content! Thanks 👍🏾
Thanks piz11!
Thanx
Thank you for ur videos!!
Glad to help Christian!
Awesome thank you
Glad you enjoyed it!
Great video
Glad to help!
Wow really Good job
Thanks a lot GK Tech!
Good video, keep the good work, would you do videos on checking components on certain scenarios, to troubleshoot!👍
Robert, I would like to in the future, thanks!
Thanks for the info Craig! Quick question though, if indoor temperature is a different temperature than outdoor temperature, how much of a difference will that vary the pressure to temperature correlation? So for example i put my thermometer on the outdoor unit and measured 70F outdoor ambient temperature but indoor temperature is say 73F, will this effect pressure temperature measurement? And is there a say a range +/-5 degrees? Thank you for your time!
This guy is great with really great information but everything he does is on Split units. I wish he would talk more about package units.
Mic drop knowledge bomb.
Glad you enjoyed it Tom! Thanks for your support!!!
Great info
Thanks Dean!
@@acservicetechchannel Just ordered your book. Too much good info to miss out. Thanks
Awesome, thanks Dean Martin and please let me know what you think of the book after reading it!
Nice to inform techs about the non running pressure check. But it's not "air" freezing on the coil at 32F. Also, I tell my trainees that it should be between outdoor and attic (if it's in the attic) temp as they are usually not the same. Thanks, though!
Yes I mean't the humidity in the air, and yes its not usually the perfect scenario. I just wanted to get the principles in their minds, thanks!
Does this also apply to package units, walk ins and reach in coolers and freezers?
I specialize in air conditioning and cold rooms
How much refrigerant pressure must still be in the system to do a proper pressure test ?? on low and high side. Would you add a little refrigerant for the test etc etc Thanks
Boa explicação
Vamos disseminar as informações para o mundo
Aki é do Sp, Brasil 😉
Estou feliz que você apreciou o vídeo!
If there is a restriction in the system n the unit is off what pressures would u read on hi n lo sides ? I thought if there was a restriction n the unit was off then the static pressure would b low n not reach ambient temp. This is for commercial refrigeration units like walkin n reachin coolers/freezers.
6.85 Lb factory charge in your video. How much tolerance is there on the amount of charge for system to work properly. Thanks
Do you have a book which prepared on to take the 608 Certification test? If not, will you please write one? Your book is second to none.
I don't at this point yet but I would like to do so in the future, thanks!
@@acservicetechchannel When you do write it, will you please make sure to use the glossy pages exactly like you did for the other book? It helps a lot with durability and readability. I'd rather pay an extra $20 for that type of paper.
Is It your book teach how to check the gas for the air-con, inverter systems, 1 compressor can use for 2 unit,3units,4units....
Because her in Singapore all ppl use system inverter, and the air-con have just LP for you can top up the gas.
I already see the video for Mitsubishi inverter, but they dont show the details
Hi ac service tech :) im a fan of yours from the Philippines. Im more of a diyer and been researching about the problem of my 2 horsepower mini split AC (LG HS-18ipm inverter ac model number)
Can i ask about your opinion on what may be the problem of my AC system? Thanks
I am experiencing icing of my evaporator everytime my condenser (outdoor unit) gets a THOROUGH cleaning (i installed a watt meter on my ac and when the consumption hits 1,100 watts ice slowly forms on the evaporator). Icing happens when i set the thermostat to 24 degrees celscius or below
BUT here is the contradicting problem. When for example my condenser or outdoor unit hasnt been cleaned for like 4 to 5 months it is very dirty and almost clogged, BUT, i dont experience any icing on my evaporator (indoor unit) and cooling is excellent and working fine, i can even set the thermostat to 18 degrees without icing (consumption on the wattmeter registers 2100 watts)
What could be the problem? The ac technician who handles my AC servicing couldnt give me a clear answer.
Hoping to hear from you soon. Thank you! Godbless
Need to get this book in Canada but over $50 shipping is a killer
Colin, I apologize for the shipping price to Canada but there just doesn't seem to be anything we can do about the price to get it over the border there at this present time, especially with Covid and trying to maintain fast shipping times. There are bundles available on the website at www.acservicetech.com/store that include fast shipping. We also have the ebook available on our website and on google play that is less expensive, thanks!
Does this work with geothermal systems also?
Being a teacher really has payed off…Thanks for the knowledge.
I am glad to help and thank you very much for your note Mike!
Hi, Mister Craig my name is Nelson. I was checking an r-22 heat pump system with txv in the air handler. I used the subcooling method 250 psig, 91F temp.t1 the first time. I added the inf to the measure quick app with an 11target subcooling, cause I couldnt read the data plate and the app said that I had to remove refrigerant. However, the blue gauge showed the saturated temp. between 32, 33. also, I measured Delta T and it was 47. something on supply and 71 on the return, but 24 is higher than 18-21. So, my question is if Can I remove refrigerant from the system with the blue gauge on that number?
trust me people get the book
Thank you very much Willie! I appreciate it!
How are you figuring an iced up coil low on refrigerant due to low subcooling where the coil is totally iced over that uses a fixed metering device tev yes understood but a fixed metering device goes against what I have read and told by many
We check the charge with subcooling on systems that have a txv and systems with a fixed orifice with total superheat. However, even if an evap coil is frozen over with a fixed orifice, a system will still have some subcooling. If the subcooling is only 1 degree while the coil is frozen, then the system is going to read as low on refrigerant when checking with total superheat after you defrosted the coil. If it had say 5 degrees or higher while the coil was frozen, it could go either way and you could melt the coil to tell and check with superheat.
So when checking charge with the system off assuming outside temperature is 85 and inside temperature is 72 does that mean I’m looking for 78.5 saturation equalized pressures at my gauges?for a charged system?
It will more closely match the outside temperature and it will depend on how long the outdoor temp has been that high for. So to put it into a real world situation, when I walk up to a system thats very low on refrigerant and off and equalized, when I read a sat temp on both gauges lower than what the indoor temp is, I know somethings wrong because the indoor temp is usually lower than the outdoor temp. Either the wrong refrigerant is in the system or more likely, it has lost all the liquid and there is only vapor left. Thanks a great question!
If it seems close to normal the only way to tell is by running the machine. That's because you can lose over 3/4 of your gas and static /resting pressure remains the same.
On cooling low pressure will drop like a stone
Do this work for micro channel coils
It would be very similar on this scenario yes as long as the system had a single or two speed compressor running in second speed, thanks
First of all let me tell you that you really know your stuff and Thank you for all the videos and good information. Now a constructive criticism in my opinion you talk to fast and try to jam to much info by repeating to much .
Subcooling can be used on an orifice to tell me if the charge is off?!?!
Not exactly and no you cannot measure the charge with the subcooling method with fixed orifices. However, in the event of an evap coil that is fully frozen, if the subcooling is between 7 to 15 degrees, this tells you that you are not severley undercharged with refrigerant. Thats all. Its just a quick method to know whats going on. If subcooling was 0 degrees with a frozen evaporator, you would know that the system is undercharged.
B7
How to get the book
You can purchase it through our website at www.acservicetech.com/ac-book or through www.amazon.com/shop/acservicetech and the E-book is available at google pay store and our website, thanks for your interest!
at ~1:00 "Saturated Temp should match surrounding air temp". Lost me here. Why should sat. temp = air temp when system is off? (I watched the sat Temp basics, but did not see this point addressed).
You need to open a trade school.
First tip is incorrect, in refrigeration 10g or 1kg of same refrigeration at equilibrium has same pressure, doesn't matter the weight. Please correct that in your slide
Immigration Freedom. The pressure would remain the same in a system or bottle as long as the refrigerant still had some liquid left regardless of the weight. If it has liquid and vapor present, that is saturated. However, I am explaining when so much refrigerant leaks out that there is only vapor left, the pressure will be lower. Due to the availability of space in the tubing I often find about 7/8 or more of the full refrigerant charge has leaked out. If the charge had only leaked a little bit, the pressure in the system would have remained the same because there is still liquid in the saturated mix. This is an odd scenario that no one seems to talk about so I thought I would throw it out there. Check out the other video on saturated temperatures. The link is in the description section of this video, thanks!
Please I am from Iraq. Can you help me? I want to write what you say with the comment. Then I am translating it
Are you saying you are translating what I am saying in the video or are you trying to ask a question in the comment section?
Can I find a job
Keep in mind, this IS NOT for the average d I y guy. You need to have some formal training before attacking a refrigeration issue. Also must be certified to handle refrigerants.
Absolutely, you must be EPA 608 certified before handling any refrigerants. These HVACR training videos are primarily focused toward those in HVACR school and those in the HVACR and maintenance trades, thanks!
Well before say 1990 it was simply the average person's simple easy task. Ie folks topped off ac units in cars in window units and central air units. There were not even any recovery units or recovery tanks then. A 30 lb jug of R22 was 25 dollars at the local NAPA store. In Window units the bigger ones came with instructions on how to add refrigerant. Maybe in 30 years one will need an EPA license to change the oil in a mower since regulated? :) Pre EPA refrigerant rules the 30 LB jugs of R22 or R12 etc were two way valves. Ie one could pump back good R22 into a used R22 tank to reuse the Refrigerant after doing repair. Later the valves hit changed so one cannot do this with an old tank. Pre say 1990 EPA rules the common then R12 12oz and 14oz cans were used for air horns on boats and for ball games. Also for toys that shot BBs. Eons ago the cans were 50 cents each when gasoline was 33 cents. In automobiles an ac unit can just have a slow leak in seal in the compressor. Using it every month helps keep the seal healthy
@@3beltwesty Yep, those were the good old days. Things have changed, leave it to the professional. Note, I am retiring soon.