How To Refill R22 AC With Subcooling Method

How to refill refrigerant in a home AC or air conditioner. In this video I recharge a R22 unit with refrigerant using the subcooling method. I show the recharge or refill process and explain how to do it properly depending on what metering device the unit has. TXV or other. The AC condenser had a small leak which was fixed before filming the video.
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🎬 Videos Referenced:
How to Add Refrigerant (Improper Method): • How To Add Refrigerant...
How to Read Superheat and Subcooling: • How to Read SUPERHEAT ...
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🛒 Tools/Parts Mentioned in the Videos:
Yellow Jacket Manifold Gauge Set: amzn.to/3lIuWUq
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🔍 How to Read Refrigerant Gauges:
• How to Check AC Freon ...
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⚠️ Disclaimer:
This video is for educational purposes. All appliance and HVAC repair work should be done by a trained professional. Word of Advice TV is not responsible for any possible damages or injuries caused by the use or misuse of the provided information.
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[@Tonecreations2001]

never stop making these videos, no one wants to teach me a thing, you are a true hero

[@frez777]

agreed

[@MrMelo313]

Same this guy is great

[@bulltechvacr]

Where you live? Come work with me ill teach you everything...

[@MarcoGonzalez-bi6cg]

True no one wants to teach us anything good thing we got KZbin

[@jin8684]

@@MarcoGonzalez-bi6cg lol just wait till you're a Journeyman and you got clueless apprentices asking you for everything. Start the learning process yourself and prove to Journeymen that you are serious about the craft. Most of them will help you from there on. You can't expect other techs to teach you all the time.

[@Jbasto97]

So I started to get me feet wet on this. Since school didn’t teach me nothing just to pass my EPA that’s about it. I want to change careers for a while and this has sparked an interest. Thanks keep the videos coming.

[@hellbirdman]

I am so jealous of you and those videos you are posting on KZbin. I have been doing HVAC for over 40 years and my own CO. for the last 20 here in the south. It is so hot in the summer and so many of these houses are on nasty craw spaces. So, it is into the attic on 90+ degree days or into wet bug infested craw spaces in both summer or winter. It is so refreshing to see information on KZbin that is both accurate and helpful to home owners. I wish I would have done what you are doing. Heck, half the techs out here have no where near the knowledge you have. Good job! I only wish you would have been around for the last tech I taught. It would have been so helpful.

[@tptm100]

You're scaring me with those temp numbers and crawlspace descriptions , yikes!

[@jeromebullard6123]

Literally getting pre training from your videos. Excited to get into this field and out of my monotonous office job!

[@Spencerbuildsit]

good vid, but when i see a problem like low refrigerant, my first thought is...WHY? i want to see vids on trouble shooting and fixing leaks

[@taephillips3276]

Tighten or replace Schrader valve cores. If you wanna test them take the valve cores out of a core placement tool w the system off and see if your pressure goes up

[@lawofattractionc61]

thank you sir .. i have an interview tomorrow for an apartment maintenance job and your videos have helped me out big time .. you make everything so easy to understand .

[@catfeline1530]

Thanks for the treat at the end, love the cat and son together

[@rodgraff1782]

Pretty good video. On a TXV system, a sight glass installed in the liquid line right before it enters the indoor coil will help in diagnosis. The sight glass should be clear, indicating there is solid liquid refrigerant entering the metering device, which is necessary for the TXV to do its job. If you see bubbles in the line, it could be from low charge, or a restriction . The subcooling reading is key to telling which of the two you have. High subcooling indicates a restriction. Low subcooling indicates a shortage of refrigerant. To properly top off the charge, add enough refrigerant to clear the sight glass, then add a little more while measuring subcooling. The more you add, the more subcooling you have. You only need enough to prevent the refrigerant from flashing back into a vapor, do to pressure drop in the liquid line.

[@orange_ash6902]

Couldn’t have posted this video at a better time. I just went into my A/C mod and this is being covered now. Your videos are insanely helpful and have helped me better understand things. Also, keep me ahead of the curb lol.

[@scottm3552]

You still in the field?

[@orange_ash6902]

@@scottm3552 yes sir, 3rd year apprentice

[@scottm3552]

@@orange_ash6902 I’m just getting in, I have an associates degree in hvac, I just got offered a job for 25/hr but I have a warrant out for my arrest far away so I didn’t get the job. :(

[@orange_ash6902]

@@scottm3552 well, if it’s an options I would settle up with the warrant and put whatever fine you need to so that doesn’t follow you. On the other hand, there are a million hvac jobs out there and the skills you know only make you more valuable. Have you done work in the field yet?

[@scottm3552]

@@orange_ash6902 just the two years of school, no field experience. Had first job interview last week and they wanted me. I own high end tools and was number 1 student in my class.

[@miguelcordero227]

Always good to know the right way and also the quick way like your last video. I wouldn’t say it was the wrong way. Your videos are very informative. Keep them coming.

[@jeebs2002]

Agreed. Especially since it was not intended to be long term; he covered the fact that the unit was planned to be upgraded in a few weeks anyways. If it was a paid service call, of coarse, do it the right way to cover your work.

[@oneundecided]

Thank you for your video! I was was following it and I just recharging my AC from the R22 recovery bottle. I measured the pressure inside the bottle and at the beginning it was 148 psi at outside temperature 84 Fahrenheit. I purged all my hoses red, blue and yellow. I have connected the yellow hose of my R22 charging manifold to the vapor side and placed the tank upside down on the scale. When red and blue hoses were connected (red to the thin high side and blue to the thick low line) and the air conditioner was off I measured on red line 120 PSI and on blue line 115 PSI. When i started the AC, the red line was at 195 PSI and the blue was at 195 PSI. I started to add the R22 refrigerant from the bottle via the blue side vale in small portions and after 20 minutes of charging blue line was at 40 PSI and red was at 210 PSI. After 30 minutes of charging blue line at 46 PSI and red line at 215 psi. What is bothering me is that at the beginning the air temperature inside my house leaving the air duct was at 16.2 degree Celsius and after 30 minutes of my AC charging it was 18.6 degree Celsius. Also I was under impression that the red line pressure will go up after charging and the blue line pressure should actually go down, but in my case it went up instead. Any recommendation what I have done wrongly?

[@paulaboukhaled813]

I am following your videos, and you are doing an excellent job with the illustration. God bless you.

[@freecopt4003]

you are a good man and not ashamed to correct any mistake or video may confuse the watcher. I am not a tech . Just interested. Thanks

[@wayneschneyer8699]

Another very good and useful video. I only ask this as to prevent confusion. Since you knew it was a TEV metering device, why did you need the wet bulb temp as there was no reference to it afterward? Also as a veteran HVAC professional, I would like to see what the “operating superheat” of the TEV was. Typically they are in a range of 9-12 degrees, although this unit is at the manufactures required sub- cooling, the TEV could also be not working correctly or have contributing problems , like a dirty coil or filter. If the unit needs charging: 1. Was there a leak? 2. Always check both the S/H and S/C 3. When charging, purge hoses first. 4. Check the delta T across the coil. Is it 18-20 degrees after about 10 minutes of operation? 5. Is that evaporator coil dirty? 6. Is the condenser coil reasonably clean? We are in the heat transfer business, all these need to be checked if charging ( existing unit repair call) is required. Thanks for the great video.

[@rawimpact]

It was a txv not a tev. He addresses your questions in the description, learn how to comprehend and KZbin.

[@wayneschneyer8699]

@@rawimpact Hello, Comprehend you say? Ok, the spelling of Thermostatic Expansion-valve gives you the correct TEV! TXV is the colloquial spelling, as Xmas instead of Christmas. Comprehend? He did not explain why when he knew a TEV was installed what the wet bulb temperature reading would afford him. The answer would have been it would show the total load on the evap and aid in knowing what the evap was seeing so when a superheat reading was accomplished, say 9-12 degrees, he would know that the cool was loading appropriately. The delta T would also show that if he found say 16 degrees, the humidity would be indicated in the previous wet bulb reading. As the humidity starts to drop the delta will climb to a desired 18-20 degrees. I do comprehend quite well and my points were correct and valid. Learn to read and comprehend.

[@Christopher-li7uc]

@@wayneschneyer8699 lol i call it a tev at work as well just to drive the guys crazy 😂 even put it in my dispatch notes 😁

[@openyourcoconut4774]

@@Christopher-li7uc that's hilarious I'm going to start doing that

[@ilovenythismuchilovenewyor5801]

hes a do it yourselfer that's helping customers cause damage to their units and also steering young techs wrong ... but hey we end guys like him because the customers will spend even more to repair damage done after watching hacks try to teach them the wrong way

[@bettershooter]

I always like your program, enjoy almost every one of it, thanks, young man. but just one more thing, don't forget purge.

[@chanpreetsingh648]

Great work jay. Keep up the great work. You are good in presenting. Good quality video with pictures shown correctly of a coil, vaporiser etc. You are really helping others.

[@preddy6997]

Thank you Jay ,its good informative video and easy to understand and very useful to home owners .

[@livingyourbestlife711]

excellent video, Jay! thanks for sharing!

[@jotu173]

Great video. I see that someone is using their Hawaii quarintine time productively!

[@WordofAdviceTV]

Thank you! Yes, quarantine time is great for video editing! :)

[@garyg6000]

Glad to see you from Hawaii !! Hope you are enjoying it there.

[@WordofAdviceTV]

Hawaii is going great!! :) Just filmed an update video today about how the move is coming along. Hopefully will get that posted some time next week.

[@ufukak2024]

Thank you for amazing video, It helps a lot. But I just wanna let everybody knows that you need to check temp on liquid line with pipe clamp (at 5:37 mins on the video) instead of discharge line. I think you did right but said wrong. Thank you so much again and please keep teaching us.

[@jawedhasan6195]

Great explanation 👍👍👍👍👍👍 Great job👍👍👍👍👍👍 Learned lot of things from your video.thank you so much.❤️❤️

[@keithk5963]

Wow, great information...So I'm going to call my AC guy to do it for me...

[@tovarusperkins3955]

I like the improper way video better.😁 Just getter done.

[@patrickphippspa584]

As always a WONDERFUL video Jay. Hope your well and happy. This was a bright start to my morning sipping coffee and getting the day started!

[@WordofAdviceTV]

Thank you Patrick! We are indeed well and happy and sincerely hope you and family are feeling the same! :) Glad to hear that the video went well with the morning coffee! Have a great weekend!

[@hollidaydoc45]

As usual, very informative.

[@WordofAdviceTV]

Glad you think so! Thank you!

[@jgt5642]

thanks for the advice, i should be able to do this as well thanks to you and all other content creators on youtube. very much appreciated.

[@motallidap1062]

Learned a lot from your video...keep it up. Thanks.

[@fernandorosillo9715]

Great job and very well explained.

[@WordofAdviceTV]

Thank you!

[@akkinojohnsoncaribbeanac1980]

Loving the video and information 👍

[@isaacsamuel2673]

As usual thanks a lot!

[@Somthulung-mc8ts]

What a wonderful lesson man

[@RobRocker09]

some people have nothing better then to put someone down for a quick fix situations I get it your two videos. You are throttling it to simulate an office for adding liquid. If the label is faded I check the indoor air handler and on the condensor I try and find the compressor model and research. Thanks for the app recommending

[@mariohenriquez8599]

Beautiful boy, congratulations. He has an hard worker daddy.

[@tonyd3029]

Great video! Thank you

[@kvasir40]

Thank you so much for sharing this so informative video. It was crucial and useful.

[@jayprice9317]

you are a great teacher plz keep going

[@jayprice9317]

im just learning this going to school for it feels like so much i dont know wish hope i get someone like u when i get first job...really dude sometimes i feel like im soooooo lost...lol

[@bejoythomas6368]

Very useful and informative

[@davidgamez1508]

Thank you for explaining it , with what I'm learning in school right now and watching your videos I'm understanding little more . I need to learn as much as I can .so thank you

[@nsant]

You won't learn how to be a tech in school. You learn some basic principles that will help you be a tech. School really only shows that you'll commit to a company of you committed to going to school. Nothing beats in the field experience.

[@edilsonserafim4784]

What I found interest was that before you added refrigerant by looking your low side gauge had good pressures and your saturation temperature was around 40 degrees wasn’t showing low on refrigerant by the gauges,but after checking sub cooling was a diferente thing,good videos thanks

[@nsant]

You can't just charge until the low dose shows a saturation temp is 40*. There are sooo many more variables.

[@jozeflak1868]

Thanks for your video I do hope you enjoying Hawaii

[@WordofAdviceTV]

You're welcome! Hawaii is going great!! I hope to post an update on our journey some time next week.

[@adammiller2246]

Adding refrigerant into a unit. Using the throttling method, having an inline sightglass comes in handy. Every gauge set I have or used has one on it. it helps because you can see the refrigerant going in

[@nsant]

Yes, but when you have a solid column of liquid, you can't tell anymore.

[@adammiller2246]

@@nsant What I meant was my inline sight glass is on my gauge set. This way I can see how much or fast I am adding refrigerant.

[@jaimedpcaus1]

Excellent! 😊

[@markadams3084]

love seeing the kid playing with the cat better than the end of video jokes, lol. by the way cats do sometimes eat grass.

[@classic287]

Wow, more complicated than I ever realized 😳. Good thing you’re a pro👍

[@WordofAdviceTV]

Yeah.. Refrigeration is a bit more complicated than replacing a capacitor. I like the new profile picture! :)

[@classic287]

Word of Advice TV Olle and Sven die in a snowmobiling accident, drunker than skunks, And go to Hell. The Devil observes that they are really enjoying themselves. He says to them 'Doesnt the heat and smoke bother you?' Ole replies, 'Vell, ya know, ve're from nordern Minnesooota, da land of snow an ice, an ve're yust happy fer a chance ta varm up a little bit, ya know.' The devil decides that these two aren't miserable enough andturns up the heat even more. When he returns to the room of the two from Minnesota , the devil finds them in light jackets and hats, grilling Walleye and drinking beer. The devil is astonished and exclaims, 'Everyone down here is in misery, and you two seem to be enjoying yourselves?' Sven replies, 'Vell, ya know, ve don't git too much varm veather up dere at da Falls, so ve've yust got ta haff a fish fry vhen da veather's dis nice.' The devil is absolutely furious. He can hardly see straight. Finally he comes up with the answer. The two guys love the heat because they have been cold all their lives. The devil decides to turn all the heat off in Hell. The next morning, the temperature is 60 below zero, icicles are hanging everywhere, and people are shivering so bad that they are unable to wail, moan or gnash their teeth. The devil smiles and heads for the room with Ole and Sven. He gets there and finds them back in their parkas, bomber hats, and mittens. They are jumping up and down, cheering, yelling and screaming like mad men. The devil is dumbfounded, 'I don't understand, when I turn up the heat you're happy. Now its freezing cold and you're still happy. What is wrong with you two?' They both look at the devil in surprise and say, 'Vell, don't ya know, if hell iss froze over, dat must mean da Vikings von da Super Bowl.'

[@archymarchy]

@@classic287 lol, we have the same joke about the Cubs here in Chicago.

[@darkdelta]

My suction line, from the wall to the unit has foam wrap insulation around it. There is a small area exposed to the ambient air. Using an IR thermometer, should I use the exposed area for temp readings or expose an area underneath the insulation to determine sub cooling? There is a pretty good difference.

[@NoorRefrigerationsystem]

Wow amazing video I love this channel ❤❤❤

[@WordofAdviceTV]

Thank you!! We appreciate the love!

[@misterindependent7994]

If it's an R22 you can just about assume that it's not a TXV. Its also irrelevant. Just charge according to the charge chart on the inside of the cover plate of the condensing unit. Most important thing to do before charging is cleaning both coils and change the filter (sales).Good luck out there my fellow techs. God speed.

[@andrewn7101]

You forgot a static pressure test for proper fan speed and airflow confirmation through that filter and clean coil. That is the most important thing to confirm, you can’t charge a system correctly without confirming airflow is correct first. Any tech that says a system is over/undercharged without analyzing the airflow is guessing. In this trade, if you’re not testing, you’re guessing.

[@misterindependent7994]

@@andrewn7101 ABC's air before charge.

[@rsilvers129]

True. Plus superheat works with any valve so just always use it. The only “downside” is you need a wet bulb temp, but that is way easier to get than to find if there is a TXV or not.

[@hakandikmen6193]

Perfect like the other video 💥💥💥

[@WordofAdviceTV]

Thank you! Glad you liked the videos!

[@dgapp76]

FYI, if a refrigerant has a letter after the number (ie. R-410A, R-407C) it is a blended refrigerant.

[@nastyhvacr]

Just like 134a

[@kkovler1]

don't think too many folks will have or spend the money to do their own charging, plus you still need the refrigerant which not easily obtained, but it was a nice lesson in the procedure.

[@proanswers]

Needs to be LEGALLY obtained and handled through an EPA certification i.e. 608.

[@WordofAdviceTV]

I agree. This video is mostly for HVAC technicians or anyone else who is curious. I think the handling of refrigerant is better left to the techs, not something a homeowner should attempt.

[@hkhsm359]

Poor cat.. LOL Nice job. Like your videos. Good knowledge. Keep posting videos.

[@WordofAdviceTV]

No cats were harmed :) Thank you, glad you liked the video!

[@tptm100]

So the temperature from the line set's liquid line is taken with your UEI temp clamp and subtracted from the High Pressure R22 red gauge temperature reading?

[@benjets9345]

Great video explained very good now a ?? if u would add refrigerant to semi truck A.C. would you use the subcooling method too or how would you do it

[@etnwhvac]

A sign that it has a fix orifice will be that the coil connection for the liquid line has a threaded fitting. That gives the option to alternatively install an external TXV. In my years as HVAC tech I yet to see a fix orifice furnace that has a sweat connection to it!!

[@Froggability]

Gotta get an engineer mirror my friend! They're an essential and quite cheap at auto supplies shop

[@WordofAdviceTV]

Haha yes! I had a small telescoping mirror but that one was larger so I used it instead.

[@vuonghung3134]

good job 👍👍👍👍

[@GaryGFeng]

Great job & video, very helpful. Could you tell us the web link for downloading the subcooling charging calculator

[@grantlam9247]

Thank you!!!

[@grantlam9247]

I do have a question. Is this TXV and Non-TXV only apply when charging R-22 ? Does the charging methods applicable to other refrigerants as well ? Thank you in advance

[@allsystemsgootechaf9885]

beer can cold baby. i dont even drink but that shits refreshing

[@alstevens44]

Ill keep watching your videos, I hope you can teach me

[@frankieruiz9325]

Nice video very good .

[@Daniel-dl3jb]

Awesome explanation. How do you like that multimeter? I've been using it for a few months now and I love it.

[@WordofAdviceTV]

Thank you! I love the multimeter!! I have had a few different ones in the past and this one is by far my favorite!

[@chentim1685]

Thanks jay Thanks for all your great videos If there’s not much sub cooling Does that means there’s not much refrigerant in the pipe Do you think it could be some of air inside of pipe possible

[@gustavocalderon8153]

Thanks a lot.

[@toromocho]

Thank you video. Do you have a video about recharging R410A to the system? Thanks again

[@countryraptunesproductions8851]

Thanks Brother

[@WordofAdviceTV]

You're welcome. Thanks for watching!

[@zekenzy6486]

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

[@WordofAdviceTV]

Thank you! Have a great weekend as well!

[@user-mc4ui6up2u]

I love it so much. How do I use clamp meter to read me the ac gas ?

[@roba9607]

Jay, Awesome video as always!!!

[@1975coronel]

Belleza mi gustan los vídeos

[@nuttysreviewshow8022]

Hi Jay, if we have a fixed metering device, we will take the superheat measurement and do the exact steps that you showed us, but fill up the R22 freon from the vapor line, is it correct?

[@theaustinite5320]

thank you for your great videos , really helpfully.

[@SteveKran]

Nice XL BGE!

[@jima3129]

You would think that the guy that installed it would simply write TXV on the sheet metal with a sharpie. I guess that was too much to ask. Freaking DB.

[@sabergermd]

How would you compare that Amprobe to the UEI DTH-35?

[@79aac]

Hey Jay! What is your opinion of how does HVAC and Appliance Repair stack against each other? Money, effort and so on? Thanks!

[@mannyforeal]

With all the different types of Refrigerant do you go off of these analog gauges or do you use the digital gauges that can read all sorts of different Refrigerants?

[@JaimeGarcia-hh1kl]

Hello 👋 great video but I’m a little frustrated.. do you looking for a 13 degrees no matter what temperature is outside if is 80 degrees or 100 degrees it doesn’t matter???? thanks

[@haydermuhammed7002]

Amazing. Thank you so much

[@MaMa-qh4dy]

Always bleed the lines before adding refrigerant. You don’t want to let any air into the system.

[@WordofAdviceTV]

Did I forget to do that in the video? Yikes. You are very correct, always need to purge!

[@norina6767]

What happens if air gets in your system..i just had freon 22 put in by a hvac guy he dud not purge the lines. Its barley cooling my house. He charged me for 3 pds.

[@milotorres6894]

@@norina6767 he should've checked for leaks on system, waste not to before charging it up 3lbs is alot of money for r 22 ,unless r 422 replaced ,either way a candidate for replacement on a 15 yrs. old unit.mho ,🤔👍✌️🙏

[@norina6767]

@@milotorres6894 he didn't thats what i get for ever one saying you prob just need a shot of freon. Mine uses 22 he charged me 160 and even he said that as well. Next day u started looking at some utubes and google info and realized i got took for that 160. Being out of work and not bringing money in blows lol.

[@morallyinsane7639]

With low loss fitting hoses, no need to as long as you have charge in them, without them, you’re losing charge.

[@kamalnasari8632]

Hi 😊 Xmas Do U have any video to explain more About TXV Video & subcooling method .

[@mikeycordoba2707]

Can u do the same on packet units

[@martineucza486]

Excellent video! Under what names is the SC APP? Thanks

[@dominiquepierre916]

Would you please make video of what is wet bulb and what is dry bulb Thanks a lot

[@jimmydouglas5283]

You should invest in some digital gauges. My digital field piece does all the subcooling/superheated calculations and also tells me my line and saturated temperatures. It's Bluetooth and connects to my phone so I can see my pressures from inside the house. Also connects to other digital equipment

[@chadthornburgh4823]

a cheap wish inspection camera worth its weight in gold i paid like 5 bucks for mine works great

[@bigbrother3662]

Charge slowly until the suction line is sweating and the fan is pumping heat.

[@jaydog449]

Used to be that simple!!! Lol

[@Ilusha77]

Thank you for the videos!

[@WordofAdviceTV]

You're welcome! Thank you for watching!

[@sammyshadkami6422]

Hey Jay, thanks so much for all the great videos, I enjoy watching your channel, I have a question for you. I have an AC unit with oil heat inside, I want to change the AC to the heat pump system, do I have to change the air handling unit inside?

[@WordofAdviceTV]

You're welcome! Yes, a heat pump with an oil furnace as a backup heat source is a valid option. You may have to get a few quotes from different companies though.

[@kuto2983]

good video

[@josephwetherall958]

I have a 97 TRANE Air Handler and a 2008 Payne Heat Pump system using R22. I do all the required maintenance (timely filter changes, regular A-coil and Condenser cleanings, etc.). Unit works fine but I’m concerned about its age, and availability of parts for this R22 system and if needed, getting it serviced. Should I run it till it stops, or replace?

[@bobyeager6104]

What's your opinion on all the different R22 replacement freon? Are they as cold as R22? There's one called Bluon. Your opinion and thoughts

[@Donbeiren]

Is getting inside the evaporator coil the ONLY way to find out what metering device I have? I've got an old Goodman unit, the plate on the outdoor unit (CKL49-1) doesn't show what type, neither does it say the subcooling target.

[@NuttyProfessor-]

In az a jug of that 22 goes for $700.. across the border is $125

[@kamalnasari8632]

What is the wet bulb please master . Xmas & be happy new year 😊😁😍

[@mountainman.4478]

Great video. After you show you wet bulb reading. You show a notification that saying wet bulb reading only for non txv units. But that is a txv unit. Why get a wet bulb?

[@StevenSchoolAlchemy]

cool

[@seanmurphy5540]

Just purchased a house and one of the condensers is in direct, all-day, Texas sun. Should I build a fence, 2 feet away from but around the unit in an attempt to block that direct sun?

[@Fender96]

Is it better to take the wet bulb reading with the A/C off, or already running? My metering device is a fixed capillary tube, so for my purposes, I need to go off of superheat. I take mine using a digital psychrometer through an access plug in the main return duct ahead of the air filter. With the A/C already running, I’ve noticed that this reading tends to be significantly lower (several degrees) than if the blower is just running with the A/C off. This of course would make sense as the A/C will start dehumidifying the air returning to duct. So which of these is considered the proper or prefered way to take the wet bulb for an accurate superheat calculation? My hunch is that the wet bulb is best taken while the system is running. But I could be wrong.

[@anticapitalize]

You take the wet bulb return air reading with the system already running. And the system needs to have been running for around 10 minutes so all the numbers can average out. The point of indoor wet bulb is to include the indoor environmental factors in the total calculation of how the system performance is ultimately able to result in the desired superheat. This requires the system to be running.