Charging R-22 into an Air Conditioner that is VERY LOW on Refrigerant!
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- čas přidán 8. 09. 2018
- In This HVACR Training Video, I Show the Process of Charging R-22 Refrigerant into an Air Conditioning Unit Condensor in Real-Time Step By Step. The System had a Thermostatic Expansion Valve (TXV) so I Checked the Charge with the Subcooling Method. I added 2lbs of Freon into this Unit and I show each of the steps from connection, purging the air, weighing refrigerant, charging refrigerant from the liquid hose back in, disconnect, and leak test, along with the installation of the service caps. I used 2 valves, 3 port gauges, the ST4 Dual SensorTemp Reader, and a Digital Scale.
Supervision is needed by a licensed HVAC Tech before doing this as Experience and Apprenticeship garners Wisdom and Safety.
Tools Used In The Video
Digital Refrigerant Scale amzn.to/2b9oXYl
Imperial Kwik Charge 535-C- amzn.to/2uipEI6
Fieldpiece ST4 Dual Temp Meter- amzn.to/2wc1ME3
Yellow Jacket Refrigerant Gauge Set - amzn.to/2aenwTq
Refrigerant hoses with valves - amzn.to/2aBumVI
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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 #manifold #low #TXV #subcooling #superheat #sensor #scale #leak #freon #disconnect
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Here is a link to the Digital Refrigerant Scale used amzn.to/2b9oXYl
Here is a link to Refrigerant hoses with valves used in the videos amzn.to/2aBumVI
Here is the Link for the Yellow Jacket Refrigerant Manifold Gauge Set used in the videos amzn.to/2aenwTq
Here is the Yellow Jacket Manifold Gauge Set including standard hoses- amzn.to/2vLVkV9
Here is the link for the Imperial Kwik Charge 535-C- amzn.to/2uipEI6
Here is the link to the Fieldpiece ST4 Dual Temp Meter- amzn.to/2wc1ME3
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Here is the Fieldpiece SMAN460 Digital Manifold Set- amzn.to/2nB4Fe6
Here is the Fieldpiece SMAN360 Digital Manifold Set- amzn.to/2BdoaD4
Here is the Compact Ball Valve Attachment for the end of the Refrigerant Hose- amzn.to/2KUisW8
Here is the Quick Disconnect 90 degree attachment for the end of the refrigerant hose- amzn.to/2MMtVcg
Here is the link to the Appion Valve Core Removal Tool- amzn.to/2uYr8WL
Here is a link to the JB 6 CFM Vacuum Pump amzn.to/2nqbvo8
Here is the Link to the Appion Blue 3/8" to 1/4" Vacuum Hose- amzn.to/2uYlVyc
Here is the Link to the Appion Red 3/8" to 1/4" Vacuum Hose- amzn.to/2uYg6Ro
Here is the link to the Yellow Jacket 1/4" by 1/4" heavy duty hose straight- amzn.to/2umtcod
Here is the link to the CPS Vacuum Micron Gauge- amzn.to/2v1nM3O
Here is a link for RectorSeal Bubble Gas Leak Detector amzn.to/2ckWACn
Here is a link the Nitrogen Regulator amzn.to/2bXdR5f
Here is a link to the Nitrogen Flow Meter amzn.to/2brvoBg
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When you purge the air out of the hoses, do you do it with the compressor running or with the compressor turned off? Does it makes a difference? If the compressor is running while you attach the hoses, doesn't the compressor suck in the air in the blue suction hose, before you even get to purge the air out of the hoses and manifold? It sounded like the compressor was running while you purged. Thank you for great videos!!
I just wanted to say that you are one of the best HVAC CZcamsrs there is. What really sets you apart from the rest is that you take the time to answer ALL questions that are asked. That is simply amazing and is very rare in our CZcams world. We should all be grateful. Keep up the good work! 👍👍👍
Thank you very much Mr. Roberts!
I'll second that!
I agree hreat great video. May I ask a question ..
I have a 3 zone central 5 ton a.c.. The return line outsde began freezing over on a really hot day (I'm in AZ and it was 115 outside, 110asf evaporator end in a 110 attic. The ac strruggled and cpuld not bring the imsode temp.down to 79
Normally it can with moderate effort I usually would suspect air. Flow so I removed all filters and forced open all 3 zone flaps . also I force the loop back (its of thw the air flow versus weight type) tube closed. Pleanty of air flow ... But still ice. High side pressure is near 250lb r22. The sub heat qas near 25 Dee grees and the plate tells me its designed for 10 degress. I happen to have a recovery bottle. I removed aboit 4 lbs of r22 to get the sub heat close to about 15 degrees. The frost is gone ... But why? If anything I would wxpect more frost due to under charge. Toy eye it seems like the last guy may have signifocantly overchaflrged it .. But I dont understand the frost relationship. Ps this unit is responsible for about 2300 ft2 of the house. A smaller unit handles a desperate floor and had no issue . how bout an R22B retrofit video?
I got to tell you my friend you are very smooth and gentle operator of your profession and that's why people like to see that kind expertise that you present on the video.
Excellent video keep up the good work.
Thank you
Thank you very much Nurfet Alic!
@Apstore Login you could possibly overcharge then you'll have to get a recovery tank and recover the overcharged refrigerant
I am new in the field, and want to thank you, every time when in doubt I look for your videos, very explanatory, easy to understand.
Glad to help
I really enjoy these quasi-realtime vids as they prove patience is a virtue...and blow and go is not an option
Thank you for the video, well explained and to the point, you are a very patient instructor not many nowadays! Again thanks.
Great info. Perfect Sunday morning, coffee and Hvac videos. Thanks for sharing.
Thanks Dean Martin 1966, nice!
Hi, I am going to school to be a HVAC Tech, love your videos, clear and concise, thank you!!
Excellent channel! Your training and instruction is very informative and thorough.
Dude i always do what you do on my every service. and it actually works.very nice. keep on uploading you're a very very big help!
Thanks The Processor!
Timecode 0.00 to 1:45 explains the sub-cooling method very well. Either I got it this time because this is the 10th different YT explanation I've seen and I finally got it, or you're just good at explaining things - I think it's the latter. Thanks very much.
Glad it helped!
You did it at the ideal way, I never seen tech working at this precise way. Thank you
Abdulwahab Abdulteheen this is how they taught me in school 2 years ago. old style techs don't use all the practices
Thank you very much Abdulwahab! This must be done for compressor safety and for efficiency, thanks!
That is a shame some techs are just getting by just setting what they think are the correct pressures. Not only is the system not set completely correct but it becomes very difficult when a tech can't diagnose why those pressure readings aren't working such as low airflow and liquid line restriction as well as other problems, thanks
AC Service Tech LLC Exactly, and to keep sys free of humidity and dirt, this simple things voided the customer a many of service and cost in future.
Yes, yes, absolutely, do the best for the customer. It doesn't take much longer, thanks!
I appreciate your training.
I appreciate that!
Your are very good teacher I like how you explain and I really enjoy watching your videos
Glad to hear that
I like the longer video, thanks for the good info.
Thanks 404 Refrigeration!
Very well done video. Thank you for sharing.
Great detail and explanation.
Thanks Roger!
Great clip
Crystal clear
Thanks for sharing
LIKE it
Thanks a lot! It's a great video tutorial. 🙏
Thanks Alb!
Thanks for all the videos
Glad you like them!
That was great video boss , I really enjoyed watching it lots of information
Thanks a lot Pete! Have you checked out my book that I just completed on refrigeraant charging and troubleshooting at acservicetech.com ? thanks!
Great video, all the best
Love your videos man keep up the good work
Glad you like them!
Thanks for posting. I have an R22 and have had the AC tech over a couple times. Always wanted to know what was going on.
very practical info, thank you ...
Thanks Pei Broker!
Great video. Thanks so much!
Thanks Chris!
Great job and video like always
I appreciate that
Excellent teacher very orderly...
Glad you enjoyed the video Basdeo!
Thank you ! Great video
Glad you liked it!
Great Video and detail.
Thank you!!
great video thank you
I love your videos, lots of information. I have learnt so much. Just one question, why does the high side fluctuate from 300 to 400 and 500. Is that a restriction in the liquid line
Grat video my friend tanks
Thanks for the visit
Well explained!!
Thank you for your support!
Much respect.
Thanks Electric Boogie!
Thanks 👍 for understanding my channel 🎉
Good info ,thanks
Thanks Russell!
Thanx for a great video. Our older Lennox HP29 outdoor unit was using emergency heat for a few months in the winter. I had watched A LOT of You Tube videos during the late winter months anticipating adding refrigerant in the spring. Knowing the Schrader valve cores are a common leaking problem I purchased a "leakless" tool to replace them last week (Mid May) before recharging the unit. I had very little pressure when using the tool to replace the cores. I used the chart from the service manual and slowly recharged the system (used 2.5 pounds of R22 in a 4 pound 2 Oz. system!!) After charging system I sprayed both the service valve cores and valve body areas with soap/water solution. I found our leak was the Stem Cap on the high pressure side valve. I gently snugged it up and the leak stopped. My question is with tool you used it only checked the valve cores and wouldn't have found the leak that I had? I did gently rinse and blow out the soap and water from both valve core area's before putting the valve caps on.
Thank you for this video. What type of the temperature meter do you use in this video? Can I use a laser probe? Also the R22 freone tank I have has two valves blue and red, do you know what these are used for and how to connect the manifold gauge to the bottle?
thank you good video
Glad you enjoyed it
When you say you closed the valve for charging the remaining refrigerant in the service hose, I'm assuming you mean the tank valve? But do you also close ball valve as well and completely disconnect from tank, or does it not matter? Thanks!
Hello AC Service Tech, thanks for all your videos, as many others have said, you AC videos are the BEST on CZcams.
My 26-year-old Lennox scroll heat pump system was not cooling very well, the temp at a ceiling register close to the indoor unit was 69° (outside temp is 100°). So after watching this video, I decided to attach gauges to the outside compressor and see what pressure was, the suction side was at 50psi and the high side was at 125psi, so I added a little R22 into the low side and the pressure went up to 70 psi, however, the high side dropped down to 70psi. I kept adding small amounts of R22 and till the suction tube at the compressor got very cold and now the temp at the ceiling register is 56°. What would cause the high-pressure side to be so low at 70psi (same as the low side)?
Thanks
leak
So just to be clear you charge refrigerant through the liquid line only when then system has a vacuum pulled on it? Then when the pressure equalizes in the tank, you turn on the system and switch to the low side and flash the refrigerant in? Thanks for all your help, just purchased the book, card and workbook combo from the website. Learning a ton from your teachings. I appreciate it.
Were you able to find the leak prior to adding the r22? If not how long was the customer able to enjoy a previously charge? Ie when was the system charged with refrigerant previously?
I have a question. I'm running 75 psi on low side and 260 psi on high side it's about 110 degrees outside in Houston with heat index. The stat holds at 75 but runs all day long and inside temp goes up to about 76 in the heat of the day, about 58 degree supply air. I've checked for door leaks filters, closed blinds changed stat. It runs all day and shuts off when it starts to get dark. But runs all day to hold 75 degrees, subscribed thank you very helpful video
Great 👍 video
Glad you enjoyed it
If you were using the atomizer thing how would you add the refrigerant then? Like normal? A little at a time? Thanks for someone answering me in advance.
Hello Craig,i just have a question,what about if we have low pressure at high side line and high pressure in the low side one?,lets say 195 in high and 150 in low? On r22,thanks
hi, while adding refrigerant to the low side, the pressure and temp. did not move at all. (only the high side readings go up) . is this because the txv is set to maintain a constant superheat? thank you.
Regardless weather you are running the heater or ac do you gas it up the same way on a split System heat pump interthem?
hi sir I have a question for you , my ac had zero freon (r22) , I watched lots of your great video But I can't find the video how to charge R22 freon from the empty, do we charge it through the low or the high sid hose? I will buy all the tool from your web. below thanks
So if it were a heat pump, would you add in heating or cooling?
Craig when I first come up to an air conditioning system, how can I tell if it has a TXV versus an orifice?
I have a 3 1/2 ton package unit that shows very high super heat [ 26 } and low subcooling {12 to 6 degrees, high side flucuates slowely from 97 to 102 degrees R-22 ] don't see any rated values for the subcooling on any data plate. There is a chart with many numbers comparing outdoor air temp with entering indoor temp and has MBH, S/T, AMPS HI PR, and LO PR values. How does one proceed to figure the rated subcooling.? It has two TXV's and the evaporater coil did freeze. I though i was going to find ice on the TXV or filter dryer but didnt. The intake [vapor] line to the compressor iced up after start but went away after 15 min. Looks like Its might be low on R-22 charge.
Love your videos and have my certificate. Im a home owner and know just enough to get in over my head.
Just saw this video. since R22 needs to be charged in viper form, why you turned the tank upside down? can you charge R22 without turn the tank upside down? Thanks
What was your working pressure for this unit on the low side and high side for this R-22 system??? Also thanks for making these videos simple btw I bought your book from the website as added reference to my other HVAC books can't wait to receive mine.
79psi on the low side and 192 on the high side. This was an R-22 14 seer condenser. These were the pressures but we are more concerned with sat temps, thanks and I am excited to hear what you think of the book! Thanks!
Thank you
Would you add the R22 slowly like you did even if you use the Imperial Tool 535C Kwik Charge Liquid Low Side Charger? Or would you just open it up all the way using that tool?
Very nicely done! 😀 If you ever get the time, could you do a video on calculating heat gain and heat loss. There are some techs who simply go on a rule of thumb such as the square footage of a house such as one ton per 400 sq. ft. and never consider the orientation of the walls, insulation, windows, doors, etc. And some units may be undersized or oversized based on their ‘gut’ feeling. Thanks for your knowledge and superb explanations and demonstrations in educating the HVAC community. 😀 👍
Stuzman, thanks for letting me know what you would like to see. I would like to do a video like that at some point, thanks!
I'll second that as well!
Hi, at 3:23 you add the Freon to the system and use a SCALE to weigh the refrigerant bottle to determine how many lbs were added. Is this the only way to determine how much Freon was added to the system. My old Lennox A/C 2.5 ton R22 says it can hold 5.7 lbs. How do you determine how much Freon you need to add ? R22 is way over $100 per lb now right ?
Does the compressor needs to run for me to add refrigerant? Im having issues of my compressor will turn on for less than 5 sec then stay shut off
Two thumbs up!!
What a great video!!
Question if I find a system completely flat, do I have to pull a vacuum to charge the unit back up? Or will it suck in the liquid without the vacuum process. Thank you
If u find unit flat u have to add nitrogen / little freon “-“ and find the leak then pull / filter dryer / vacuum add freon the vacuum process is too make sure no water in the system water is bad with or without vacuum it will take the “-freon”
Find and fix the leak. Pressure test with nitrogen. Change all shader valves also. Pull vacuum, acid test compressor. Go to school for this like everyone else that paid alot of money to be teached and don't rely on free you tube videos
@@ronnyoo9371 also I have no idea why but sometimes I have came across the valve has been turned and not set back to proper position. It will give you no pressure on guages. It is rare but when coming in after some one that doesn't know there shit, it can happen
If there is a leak at the test valve, do you need to purge the system to replace the valve?
Just wondering lets assume i had a service replace txv and i need to charge the unit i want to weight it in liquid side but i dont have a Gauge hooked up to liquid side if i charge liquid to the suction side without the compressor being on i would slug the compressor right even if i let it even out ?
Hello there. I charged an old split air conditioner unit from scratch with R22 refrigerant in gas form. Only the steam line of the unit has a service port, and the liquid line does not have a port. Therefore, I connected the thermometer to the steam line and started to charge the gas. I charged it until the internal unit was blowing cool, but the reading on the thermometer didn't tell me much. Outdoor temperature 36 Celcius (96.8 F), gas line temperature approximately 18 Celcius (64.4 F), Gas line pressure 5.2 Bar (75.42 Psi) with unit running. Then the compressor of the unit got hot and stopped. What should I do now? What is the pressure to read in the R22 gas line?
It looks like you may have never purged the red hose! You filled the service hose with refrigerant from the system thru the blue hose while purging it, then you opened the high side manifold valve very briefly and blew some of the refrigerant already in the yellow hose but never blew all the air out of the red hose.
I tried to find an AC Service Tech video about how and when to add oil to the system but couldn't find one. If you have never done one, would you consider doing one because all the videos out there about oil (except for the one by DENSO manufacturer) are not very good. Thanks for all the great videos!!
Just added 3 lbs of r22 via liquid and i got the superheat exactly where i wanted but im still worried that i overcharged. Didnt get to clean the coils like i nornally would before charging.
Question when u let the air off the hoses does the equipment has to be off or on ?
You have make sure all the coils and filters are clean..
How do you keep the compressor going when you're low on refrigerant and it wants to short cycle
Do you just hold the contractor in
Love the video. I only have one question and I hope it’s not a dumb one. Do you leave the high side control valve open while charging on the low side? That’s the only thing I am not sure on.
No. The high side pressures would be higher than bottle pressure.
What was the ambient temp and Delta T when started and also when finished
great video. small question. could you give me a few reasons why when charging a unit the suction line will not get cold or sweat back?
Hey Eddie, it may not get cold if the unit has a piston as the metering device or the indoor wet bulb temp is too high such as starting the unit for the first time when it is hot inside. That is just one of those feel good things that we like to see but certainly is not a measure of the charge level or proper operation, thanks Eddie! I actually discuss that and other differences between the piston and txv and some of the rules of thumb that are out there that should not be used in the new book I just published, thanks Eddie!
If the intent was to add more gas through the low side and the high side valve was closed at the manifold, could you please explain why you need to purge the red hose (high side)?
Thanks for the video!!
After you're finished, if you have shut off valves on your lines, you shut off your high side and you open your low side and let it pull your high side line down. If you didn't purge your high side line when you started, you'll be putting that air into the system.
@@mlyons31I do not have shut off valves on my lines. If I understand correctly, I do not need to purge the high side and no air should get into the system correct? The high side hose would be just to measure the pressure. Thank you!!
@@diegotube10 - Yeah, If your lines don't have valves or you don't connect to a system with a king valve, no need to purge high side line, but I purge through the center just to be safe.
how would you charge and work out cooling if only suction pipe is available,do you look at psi,there is no high side to clamp to
If only the low side vapor line is available and the system has a fixed orifice metering device such as a piston or capillary tube, you can use the Total superheat method to check the charge. If it has a txv metering device, subcooling is used. I have everything I want to explain to techs in reference to working with refrigerants put in my book that is available at my website www.acservicetech.com and on amazon thanks!
This is the stuff that should be on CZcams.
Do you turn of the condenser unit when your adding refrigerant? Or you turn it off and keep the in door fan on or everything off or both on thank you
The unit have to be on when charging..
What was leaking that you fixed?
Why it was low on refrigerant, was there any leak ? First we need to fix the reason
Could I just open the blue valve very slightly to very slowly let the refrigerant in and leave it open for longer? I have a viewing window in my manifold so I can see if it overflows.
Get a vaporizer, they're cheap
Is this supposed to happen while adding freon
Can we charging liquid to the high side, because you’re give it as liquid,
The bottle pressure is higher than the suction pressure but lower pressure than the liquid pressure. We charge into the low side with bottle pressure and we recover with the high side pressure into the recovery bottle, thanks chen chris!
@@acservicetechchannel and
If this unit did NOT have a TXV, would the high and low pressures have ended up the same as in this video ( 70/200), or very close to that?
Yes
What if the low pressure switch shuts down the system after about 10 seconds? How then do you get enough refrigerant in so that there is adequate pressure to keep the system from shutting down?
The bottle pressure is high enough to do that.
Why it was slow in refrigerant.? Wouldn't be better to check for leak.?
Can you charge without a scale?
Do you need to purge if your just checking not adding?
Look up "acservicetech connect disconnect" you would because we charge the liquid back into the system before the disconnect, thanks
Hi. I have to questions. Is there a drop in replacement for r22? And when does a leak need to be repaired?
Do not use a drop in.
Why is R22 upside down? I thought 410A is charged using upside method?
Question to the smart professional man if I leave my AC running while evaporator is frozen will I lose Freon / R22??
If there is a leak, then yes it would continue leaking especially if the leak is on the high pressure side of the system
And you didn't seem concerned about WB DB. Why?? Thanks.
This unit had a txv and it was above 70 degrees F inside and above 70 degrees F outside so we use subcooling as the charging method for txv systems with a single speed compressor, thanks
wont the compressor overheat if its so low as your adding the freon so slowly wont it overheat before you can get enough in to cool it down
It wont overheat in that short of a time frame and the superheat was not that high thanks
I think I just put air in my system
The hoses were not purged in the order you just showed. And I thought the r22 bottle was supposed to be upright. Hope I didn't ruin anything....
A singe component refrigerant such as R-22 can be charged into the system as a vapor or as a liquid. Liquid charging would need to be done slowly for compressor safety but if you weighed in upright then that would be fine. If you didn't purge the air then yes you have air in the lines. How bad it is, not sure. Did you check superheat or subcooling to verify you are at the correct charge? Does anything seem off in your readings?
@@acservicetechchannel hi Craig I sent you an email earlier. Actually before I did this
Its the same unit. R22 fixed. Just getting myself confused
I will look and get back with you there. Just crossing off a lot of questions here right now, ha ha, thanks
Is there a reason you don't charge it as a vapor to put it in there without having to put it in a little at a time?
Well after watching it longer I got my answer....lol but can you put liquid in on liquid side?
How much do you charge per lb?
Always shut unit off to put on low side gauge side if you suspect possible leak as unit could be running in vacuum, and suck moist air in low side hose if it is in vacuum!!
You did not mentioned the difference when charging unit with the tank right side up or up side down.
Why is the control wire going to the condenser twisted into a coil looking wire?
Probably because it was wound up and packaged that way. The wire probably kept some shape memory even after it was unwound for installation.
My apologies you did mention it about mid-way thru video.
Is it ok to add up 5 lbs?