Charging Freon: Checking the Freon R-22 Refrigerant Charge Step By Step and How to tell if its Low!

Charging Freon: Checking the Freon R-22 Refrigerant Charge Step By Step and How to tell if it's Low! This is How to Check a Refrigerant Charge on an Outside Air Conditioning Unit. I show you what you need to look for so that you know what Charging Process to Check the Refrigerant Charge with to see if the charge is low. This is done in a Step by Step Process and we explain what is really happening in the Refrigerant Cycle when you are measuring Temperature and Pressure at the service port. 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.
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[@acservicetechchannel]

Our Inverter Mini Split Resources: Mini Split Book on Our Website- www.acservicetech.com/mini-split-book Mini Split Paperback on Amazon- amzn.to/3ytHJSs Mini Split Paperback on TruTech Tools- www.trutechtools.com/BooksGuides?aff=8 Mini Split E-Book on Google- play.google.com/store/books/details?id=HN-iEAAAQBAJ Mini Split E-Book on Apple- books.apple.com/us/book/id6445178399 Our Single Speed and Two Speed Air Conditioning Resources: My Paperback and E-Book: www.acservicetech.com/the-book My Paperback: www.amazon.com/shop/acservicetech Read the book reviews on Amazon! Check out our new Articles at www.acservicetech.com/articles Support the Channel by purchasing tools through Tru Tech Tools! Use this link www.trutechtools.com/?Aff=8 Save 8% at checkout using code "acservicetech" 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 the Link for the newer UEI DL479 Multimeter with temp sensor- amzn.to/2jtsUbJ Here is the Link for the newer UEI DL469 Multimeter- amzn.to/2jw4ePJ Here is the Link for the UEI DL389 Multimeter used in the video - amzn.to/2naJr9o 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- kzbin.info/door/OZR-1IqsAer9wzlvFgb4mAplaylists?view_as=public If you want to support the ACSERVICETECH Channel and receive more HVAC content, check out www.Patreon.com/acservicetech

I've watched multiple hours of your videos and want to say thank you. Your videos are very good and you have already saved me several hundred dollars in service calls but I have probably spent it all in new equipment. Thanks again

[@gmd1417]

Your videos are great, real informative and easy to follow---thanks for posting!

[@acservicetechchannel]

Thanks Gerard Williams!

[@JL-ss3ux]

Great series. Very helpful.

[@realestateinfonet9041]

Superb info! Thank you very much!

[@jimbola77]

excellent video thank's for sharing!!!

[@acservicetechchannel]

Thanks for your Comments!

[@gstandsforgreentx4612]

Always a good idea to visually check for txv, regardless of what rating plate says. My rating plate says I have an indoor TXV and subcooling to 12F. Well, I had a tech replace evaporator coils under warranty about 10 years ago, and unbeknownst to me, he replaced my txv with a fixed metering device. I found this out a few days ago, while finally deciding to educate myself on my system. Knowledge is key, d'oh!

[@acservicetechchannel]

Yes absolutely, it is always best to take the door off if not positive to check for a txv, thanks!

[@enushalu2548]

Yes, most tech are idiots.

[@keithgoins7514]

​@@acservicetechchannelh

[@tpfeifer9245]

Well done

[@coreymorris3499]

Great Video

[@acservicetechchannel]

Thank you very much!

[@svallam]

Thank you for sharing the information and the time involved in making these videos. MY AC Lennox uses RFC metering system. How do I recharge the freon for this machine?

[@harpoon_bakery162]

shouldn't be too hard. watch about 8 videos because you'll pick up some things that other videos missed. like this one has the temperature probe where some other ones do not. some use a wet-bulb test and others do not, some use that extra add-on piece you see that he has on the blue side (by the gauge and some do not). Blend all of the tricks together and you'll be able to fix your own A/C freon-low condition, .

[@beemikeme]

You explain things VERY well!

[@acservicetechchannel]

Thanks Mike!

[@rinorqe]

Great video

[@acservicetechchannel]

Thank you for your comments!

[@sally8712]

Thank u!!!!

[@acservicetechchannel]

Glad to help!

[@fengyongdong6667]

very helpful info .....

[@acservicetechchannel]

Thank you!

[@danielraymond38]

I have a quick question. My tag on the condensor says fan motor 1/12 ,the tag on the condensor motor itself says 1/6. Is this underpowered? House is 17 years old and may have been changed.

[@kabirkabiry7092]

Thanks again 5 star

[@acservicetechchannel]

I appreciate it!

[@bude8234]

Have an old R22 unit that does not cool well. I believe it uses a piston as the metering device, but I can't see inside. The suction side line near the outdoor unit never seems to sweat, or get cool. My low side pressure is 75 PSI, and my high side is 205 PSI on a 90 F day with high humidity. The liquid line pipe temp was about 92 F, and the suction side pipe temp was about 64 F. So, I calculate about 20 F of superheat (64 line temp - 44 sat temp on guage = 20), which is too high, right? (should be about 5-10 according to the charts). Indoor WB was about 60-62 F. Do I just need to add more refrigerant?

[@jlc7300]

Exactly! I have a 17 yo. central A/c system, it has never had freon added to it, since new, but I have had it serviced every year, it now doesn't blow air that is real cold like it use to, it's still cool air but I feel that it needs a slight charge, my tech says no you must have a leak, I say but from all of those years of the system being checked some freon was probably lost when unscrewing the hoses to check the level. He refuses to charge it for me. what do you think? thanks.

[@12345678972041]

Are there any tax incentives for taking an old (but working) R22 unit out of service and replacing it with a new one (R410)?

[@danielraymond38]

I'm running now 75psi low side and 215 high side, I have about 58 degrees coming out of the supply, it about 100 degrees in Houston. It holds at 75 deg, on the stat but runs all day long about 2pm the indoor temp actually goes up to about 76 degrees until around 6pm ,it doesn't shut off till dark,please help. I have some experience but not enough. I have a good sweat back from compressor to where the insulation starts. I'm EPA universal so I'm able to hook up guages, I just dont do this for a living

[@notreally6175]

Nice

[@acservicetechchannel]

Very nice

[@josevilla3255]

Thank you for your videos and your help I appreciate it. I have unit with R22 and it's not cooling properly and low side I have 60 psi and high side I have 310 psi. And the unit still not cooling properly I have a question could you please tell me what the problem could be? Thank you very much.

[@acservicetechchannel]

I would need to know if it was a piston, cap tube, or txv metering device, the superheat, the subcooling, outdoor temp, and indoor wet bulb temp as well as the delta T in order to tell. It does seem that your high side pressure is high though, thanks

[@ralphgillespie7423]

Water in system

[@piezomotor]

Hello, thank you for this video. I have a question - my R22 bottle has the red and the blue valves but my R22 manifold has the yellow input house. Do you know by any chance where I connect yellow house? To the red or the blue valves?

[@hustlerhq]

blue is vapor , red is liquid. red has a tube that goes to the bottom of the tank, where the liquid is. w two valves , you don’t have to flip it upside down. you are probably talking about a recovery tank, virgin tanks only allow refrigerant out

[@tarronblasengame2816]

Im an ACR student at Oklahoma University Institution of technology. My question is, how can I correctly charge a unit if I don’t have any information from the unit saying what’s it’s supposed to be set to, and if there’s a specific super heat or sub cooling, does it apply to other refrigerants?

[@acservicetechchannel]

Tarron, I fully explained all of this in the new Subcooling article and the new Total superheat article found at the website www.acservicetech.com/articles and I explain everything you are asking wit pictures in great detail, thanks!

[@DivergentDroid]

I worked in the field for 20 years. Never used a thermometer attached to the liquid line. . I just used a temperature pressure chart that told me what range on the low pressure end I should be at. Of course if you had really high or low high pressure ( you has a chart for those ranges too) and knowing your ambient temp, you looked for reasons that would cause that. A freon tank without a fast charger device, sometimes I'd have to increase the pressure to get the system to charge due to the back pressure by putting the tank in warm water. This makes the difference on if you have to charge the system with the tank right side up or upside down. Those fast charger devices can really save time.

[@acservicetechchannel]

I believe you are referring to old capillary tube systems since they tend to maintain a more consistent pressure than pistons. You cannot use that method effectively or efficiently for systems with a piston or txv metering device for quite a range of reasons unless you are talking about package units with a manufacturer's specific table for that particular unit. Superheat and subcooling all have to do with compressor safety, energy efficiency, compressor lifespan, best possible heat removal and capacity. Yes those fast charge devices are nice and help guard the compressor. Thank you very much Divergent Droid!

[@ddcws1]

If you want to bleed back the refrigerant in your hoses to the unit do you disconnect the high side first and then open the high side valve at your manifold to let it bleed through the suction side Or is it the opposite way? I can't remember.

[@acservicetechchannel]

Thanks for your question! You can check out this video and jump to the end for the disconnect procedure.kzbin.info/www/bejne/j5XYYXVplLyeqdU

[@WildRebel69]

David Williams disconnect your red(high side) Line. Open both valves. Wait for gauges to equal out in pressure (the pressures won't be the same) once the needles stop moving wait 10 sec then remove the blue line. If using low loss fittings purge the yellow line at the base of the gauges. If done correctly you should only have air pressure released and zero liquid

[@JulioGarcia-jl5kx]

With units that have service valves do you have to mid seat them o front seat them to add refrigerant ???

[@acservicetechchannel]

Here are videos on the service valves with the high stem instead of the type seen in this video with the valve core schraders- kzbin.info/www/bejne/m4nOooKJlNasrdE --- kzbin.info/www/bejne/bpCsc3-nbrWVoLc

[@Chris-uh3cm]

Hey Craig in one of your videos I believe you stripped back the K type thermometer ..am I right? after you stripped it back did you solder the 2 wires together? or can I just strip it back ? I got this pipe strap from the fluke kit I had already but what a useless piece of junk.

[@rsilvers129]

Thanks. How do you remove the hose to minimize R22 loss?

[@acservicetechchannel]

You use the manual on off valve, quick disconnect fitting, or valve core depressor tool with backseat on the hose at the port. I have them shown at amazon.com/shop/acservicetech thanks

[@shamshirani7288]

Does this method also apply to a walkin beer cooler. R22 with txv on inside ?

[@acservicetechchannel]

Refrigeration would be a different process where you would be looking for 6-8 degrees of superheat when the unit is down in temp but if the unit was off and starting for the first time you would keep the door open and charge until you had a solid column of liquid going through the sight glass. Superheat might be 30 or 40 but then you would shut the door and check for 6-8 once it was down in temp. This is all assuming you have a receiver, thanks

[@sally8712]

If ac low on freon, can u still use ur heater during the winter months?

[@acservicetechchannel]

If you have a natural gas or propane furnace it is fine as it is separate from your refrigerant charge. If you have a heat pump that heats the house in a reversed refrigerant flow then no. I hope that helps! Thanks for your question!

[@lar3848]

Shelley Hunter yes you can

[@pxndxlunx5821]

Shelley Hunter yes lol and when it comes to vehicles. Yes as well becuase the heat is coming from the engine :D

[@alex6261971]

what were your final readings , visual was just slightly off , but i think it was something like 70 on the low and close to 200 psi on the high...? ( is that about right...?)

[@acservicetechchannel]

I don't remember, that seems to be right. Yeah, it is rough with the angle of the camera.

[@lar3848]

mr roboto mine is 75 on low and 250 on hi at an outside temp of 110

[@robevans8629]

If the unit doesn't have the subcooling on the name plate where can we assume the subcooling should be on a unit? 8 to 11 degrees?

[@acservicetechchannel]

Hey Rob yes that range is good so I usually set them at 11 degrees, thanks!

[@yungchan8914]

is it the same procedure for charging walkin cooler and freezer?

[@acservicetechchannel]

On a walk in cooler box, we use the sight glass to determine if there is 1 degree of subcooling with the door open with the highest load possible, so we start with bubbles and then add until there are no more bubbles. Then the doors are shut and the excess refrigerant that is not used is stored in the liquid receiver when the load is lower as the box lowers in temperature, thanks

[@Mattmm83]

Great video however the use of the 410a gauges drove me a little nuts, you can screw a system up pretty easily when using gauges with the wrong pressure range

[@acservicetechchannel]

Gauges are typically overlaid with 3 p/t saturation points. This has R-22, R-410A, and R-404a. You can't use a different refrigerant's p/t chart. I used r-22, thanks

[@Mattmm83]

I'm not talking about the pt overlay I'm talking about gauge accuracy. Typically a gauge is a 323 gauge which means if you were to divide it into 3 equal portions the lowest has 3% deviation in accuracy the middle portion has 2% deviation in accuracy and the 3rd portion is 3% deviation in accuracy. This may be fine with the old txv systems but when you get into vrf and rapid staging systems that are currently commercial but are starting to poke their heads into the residential market people are going to be seeing catastrophic system failures due to the inaccurate measuring techniques still plaguing the residential industry. In reality gauges themselves are a bit of an antiquated tool. They simply are not trustworthy enough.

[@myhealthtoo]

when you say 8.5 and you can go 10 or 11 you talking about pounds also did you put manifolds gauges on when it's off because it has expansion in it

[@acservicetechchannel]

I was speaking about subcooling of 8.5 can be set to 10. Gauges can go on before or after its on, thanks

[@brokenpencil57]

I believe poster was asking if the units of "8.5 to 10" was pounds, or something else. I believe you were referring to DEGREES F (not pounds) as the difference between the high pressure gauge and the temp probe, also on high side.

[@shamshirani7288]

What is the thermostat set at when you are doing this?

[@acservicetechchannel]

High enough so that cooling does not shut off on you during the procedure, thanks!

[@LubaLuba1]

Question to the smart professional man if I leave my AC running while evaporator is frozen will I lose Freon / R22??

[@dannkelly1615]

you already lost freon. reason its freezing up, & will continue to leak until empty and repairs are made or replaced.

[@veton6904]

How often does one generally do a freon refill??

[@acservicetechchannel]

If there is no leaks then you should not have to refill. This is a video on an initial charging or after fixing the leak. Thanks

[@MRM-wp4gr]

you say plus or minus 3 of your target of 10 right? You were at 8, and you said that it was actually okay there, but you could add a little r22 to bring it up to 11. But why couldn't you as high as 13? That would still be within the plus or minus 3.

[@fhffff6137]

I have a question.. on Daewoo air split says Refrigerent: R22 (470g) .. if i connect a meter how much psi should it be? 60 or more.. pls am having hard figuring this out

[@acservicetechchannel]

Whatever temperature it is outside and wherever the refrigerant is located at take a look at the p/t chart in order to determine the pressure for that given temperature. Here are two videos on that- kzbin.info/www/bejne/p2naqn6blLaZfZo --- kzbin.info/www/bejne/r3PUdZ6Yqt6of9E

[@al.e123iis7]

what if the compressor doesn't come on.. cap is good, compressor is good..?? my refrigerant looks low on high side but is it bc the compressor isn't on

[@acservicetechchannel]

You won't usually be able to tell if you are low on refrigerant unless you are severely low with no liquid refrigerant left. With the power off, check to make sure that you don't have a low pressure switch shutting off the 24v needed to power the contactor which would power the compressor. With the power off, check to make sure that you are getting good resistance readings across the compressor.

[@al.e123iis7]

acservicetech how would I check the low pressure switch mate?. I have a 3 phase rooftop. good compressor windings.. checked the low side and high side pressure contunuity and they had contunuity.. haven't checked voltage though, doing that tomorrow. not really sure how to test pressure switches though. if the switch does it s job I shouldn't see voltage after it opens.. meaning I need refrigerant???

[@acservicetechchannel]

On a low pressure switch, if there is too low of a pressure then the switch would open, thanks

[@lar3848]

Is the unit on or off when you did the video

[@acservicetechchannel]

The unit was on. The mic I was using canceled out the background noise, thanks

[@oneundecided]

Can you remove this annoying drum sound at the beginning of this video? Did you open any blue or red valves before the measurements done?

[@bokbokasawanipoknattan7423]

Sir how minutes to be charge a freon to unit and how many minutes to vacuum it?

[@acservicetechchannel]

Honestly it will all depend. 500 microns and superheat and subcooling, thanks

[@jasond8418]

He is right, supposed to be 500 microns. Supposedly if u turn off the pump and have good hoses and the gauge climbs over 1000 microns after sitting for some time that’s supposed to indicate a leak somewhere in the system.

[@petem3162]

Si there a drop in replacement for r22?

[@tpfeifer9245]

Yes there is, caution it’s flammable.

[@petem3162]

@@tpfeifer9245 ok thank you!

[@donaldtate3372]

Audience, now if I spoke lawyer talk to this tech, he just might say I'm dumb founded. His simple jargon went way over my head...Smh

[@acservicetechchannel]

If you want to support the ACSERVICETECH Channel and receive more HVAC Content, Correspond, or Collaborate on your endeavors- check out www.Patreon.com/acservicetech All of the ACSERVICETECH Playlists- kzbin.info/door/OZR-1IqsAer9wzlvFgb4mAplaylists?view_as=public Submit your email to the ACSERVICETECH email updates list at [e-mail]

[@jonathancardenas4387]

can you charge r-22 with the drum upside down

[@acservicetechchannel]

You can charge with a virgin r22 upside down in liquid but you need to meter the refrigerant in slowly or with a liquid vaporizer. If you are charging out of a recovery bottle the liquid has a dip tube so keep it upright. recovered refrigerant can be charged into the same owners systems. Thanks!

[@jonathancardenas4387]

since it's the suction vavle where we are charging it, I thought you can't charge with liquid because liquid can harm the compressor, causing it to slug? am I wrong? I don't know

[@bwasfpv]

Jonathan Cardenas he used liquid vaporizer as you can see from below of the blue gauge

[@orlandojohnson5742]

I guess a lot of people finding out ... R22 refrigerant is too expensive now!?!?! Let the old 10 SEER R22 system go.... or retro-fit with a replacement refrigerant!!!! 410a 14-21 SEER is the next move!!!! You can save money Changing your filters & flushing your drain lines.... but a service tech should still check your system once or twice a year!!!! I have seen a handyman butcher a system(s)!!! Even broke an attic access ladder at the base & stepped a hole in the ceiling!! Same house!! Quit trying to get the same Service out of inexperienced people!!! When you have an electrical problem do you call the plumber!? If a company does all in one... doesn't mean the guy in the vehicle knows plumbing!? He may be the regular tech that does electrical!? The system is hacked now.... companies are just trying to get in your house!? If the tech sent out can't fix..... they send the real(the real plumber?!) tech ! Basically if u don't pay attention to what's really going on.... it's just a person learning on your stuff at your expense!!!

[@acservicetechchannel]

Always call an HVACR company especially if they only do that specific trade and go by referrals from neighbors and friends thanks!

[@Kevin-bl6hx]

Or if you have a brain in your head ....study, learn , then learn some more . Purchase quality tools (Gauges, hoses, temp equip, etc) Procure yourself a tank of R22 and have it on hand if that is the refrigerant you need. Do the maintenance and upkeep yearly ...and when , not if ....you need a charge , you do it yourself for a fraction of what it would cost you to have a real HVAC trained pro do it for you . Yes it's ideal if money is not an issue to have a pro handle it, but that is not always an option for some . Learn & practice safe habits (eye wear, gloves, etc) and get to it . These skilled Pro's take the time to show you the proper way of doing things . The people who do these videos are a GOD send for most

[@acservicetechchannel]

Check out other videos on the HVACR topics of interest at- kzbin.info/door/OZR-1IqsAer9wzlvFgb4mAplaylists?view_as=public

[@wilfredourquilla659]

Nice video but it is to annoying to hear a hundred time oh right, oh right, oh right, oh right, oh right, oh right, oh right.

[@acservicetechchannel]

Yes I understand and apologize. I am trying to curb that as it is my visual cue for an eye contact of understanding from my students while teaching in the shop. Thanks for letting me know!

[@matthewrammig]

Then don’t watch it.

[@marylamb6063]

You're going way, way too fast. You're talking to people who already know all this. Put yourself in the viewer's place.

[@acservicetechchannel]

Hey Mary, The video that I put out are generally towards those in school for HVACR, in maintenance or already technicians. Technicians need to be EPA 608 certified before handling refrigerants, thanks

[@labrat56]

Bla bla bla bla makes no sense offers no help.