NON CONDENSIBLES IN SYSTEM !? No Cool Call !

Split system AC no cool call where I discovered non condesibles in system! Watch how I resolve the issue , comment and subscribe
What do you think was inside the system ?

[@dfwhvac]

I forgot to mention in the video , another sign of non condensibles would be a high compressor amp draw. At the start of the video it was 85 degrees OA, and compressor was running 8.7 amps , rated at 9.6. Later in the video after repairs the compressor was running 8.5 or so amps at 102 OA. - this tells us that at over 100 OA with the non condensibles we would most likely be overamping the compressor.

[@jimdavidson5208]

KEEP THE VIDEOS COMING SIR. I like what I see.

[@michaelproust7891]

Excellent explaination, thanks for the umbrella.

[@markcotter2355]

good job on the diagnosis

[@pineychristian]

DFW I was always taught to cut out filter driers. Unsweating releases contamination back into the system. Granted your not working on a Jem there. I retro all my big roof tops where I work to M099 and had great success with it. They use so much refrigerant it would cost a fortune to use R22 now.

[@dfwhvac]

Yes , absolutely best practice is to cut out the drier , i unsweat it because of reasons you stated but I did make sure to heavily purge with nitrogen after the leak check. I’m uploading a follow video tonight from my most recent isolation leak test video where I recharge a large McQuay condenser with tandem compressors with 75 lbs M099. I talk a lot of crap about drop ins , but I was actually surprised with the performance / pressures and temps on start up. Superheat and subcooling looked great. I do know that you’re not supposed to use m099 or 422b on trane 3D scrolls though or it will lock them up due to lack of oil return. Thanks for commenting and watching !

[@pineychristian]

@@dfwhvac yup... yea they don't recommend it. I have a lot of McQuay and AAON RTU's . They both don't recommend using anything but R22. Granted all my RTU's are well out of warranty so I use what fits the bill. I have found M099 / R438A has great oil return but I mostly do a retro when a compressor fails or a leak repair. I have use many of retros over the years. R407C , R422D , R427A nothing replaces R22 but they are all good options.

[@dfwhvac]

@@pineychristian this school district has been having leaks repairs and blowing through refrigerant on these McQuays for years now. At 75 lbs per circuit , four total circuits , it’s just not feasible to keep using R22. We are currently having an engineer design a conversion to a couple of package units to replace this current set up , but that’s month and months and months of planning and paperwork. Until the design is final and the check clears , it’s drop ins for these guys.

[@Laker4life760]

Ill never put retro fit in a 3D scroll.

[@pineychristian]

@@Laker4life760 I wouldn't either. R22 isn't possible to use any more. It's $1350 a bottle , if you can get it. I'm in house HVAC tech for a school district now. I worked in the field for 15 years before this. Nothing beats R22 but, retro refrigerants aren't bad depending on which ones ....

[@EverythingHVACR]

Nicely done! 💪

[@Parabellum-X]

Great job, bro.

[@Spector_NS5_RD]

A good MAP / Air torch will braze up to 3/4 comfortably. I got one off eBay a while back and it works great. I refuse to lug around B tanks, unless it's nitrogen to find a leak. Great video dude.

[@dfwhvac]

I just purchased a map gas torch kit earlier today for smaller copper lines and soft soldering. Usually I run oxy acetylene because I work on a lot of larger rtus and chillers , but lately we’ve been getting slammed with a lot of split system calls . Oxy acetylene is definitely overkill for smaller pipe diameter. Thanks for stopping by and commenting

[@denniscreamer9954]

Gray video, but FYI it is not a Goodman, most likely a form of ICP or carrier subsidiary companies

[@dfwhvac]

Thanks for the feedback. Now that you mention that yes the service panel is shaped like older carrier / icp / Bryant models . Good call

[@gyo_wrld2767]

I literally just ran into sum like this the other day think man for confirming my diagnostics

[@MariosACandRefrigeration]

great info,thanks for sharing

[@dfwhvac]

Thanks for watching. Will be posting minimum 1 video per week , hopefully for more if I have the time

[@jimdavidson5208]

Over all, nice video. Keep them coming sir. Ditch the super blaster oxy cotton torch kit for soft copper. All you need is a propane torch at 3500 degrees. More than hot enough for brazing or even better Stay-Brite 8. A Joe Slob home owner propane torch is much lighter to lug up onto a roof. No tanks and carts for said tanks. No crazy hoses to mess with. Easy to refill.

[@dfwhvac]

Thanks for watching. Just recently bought a nice map gas torch kit for smaller size copper lines. It’s a pain lugging around oxy/acetylene for small repairs.

[@jimdavidson5208]

@@dfwhvac MAP gas is no longer made. Some companies are using the name now. If the new map is more expensive than propane, forget it. You wouldn't notice the extra 100 degrees anyway IF you had real map gas. Propane is plenty hot for copper lines.

[@Brokentwobutton]

@@jimdavidson5208I might be totally wrong, but I thought MAP means mixed air propane, or something like that. MAP gas would be a misnomer iirc, but saying MAP torch would indicate a propane torch with an air intake, adjustable or not.

[@realSamAndrew]

I think you had no choice, you had to recover and start fresh with a new clean charge. But other than non condensibles, it could also have been a kamikaze mix of different or unknown refrigerants causing the crazy gyrations on the head pressure.

[@dfwhvac]

Yes it definitely could have been a mystery mix especially with that mystery recovery cylinder sitting up on the roof. Seemed like non condensibles but mixed refrigerant was definitely not out of the question !

[@Junkawayllc]

With Non condensable I would think sc / sh would be low with suction and head high. Also high amps, I would think mild restriction and slightly over charge possible.

[@kelvinpkp5623]

nice job

[@markgurnell1894]

Hiya. Just watched video. Great. Could you advise what the software is called on your laptop? Is it testo? Cause your probes are. It was a nice layout on screen with your SC and SH

[@dfwhvac]

It’s the Measurequick app Available for free on both Apple and Android app stores ! Thanks for watching

[@s.j.5850]

Thank you for this video. My system was showing low superheat so I took out some refrigerant out and after that the unit's pressures (low & high side) started surging up & down. Guess I will have to recover whatever is in there, pressure test the system, pull a vacuum, then add some new refrigerant. I'm a new tech gathering all the service tools. Which recovery machine do you recommend?

[@lammaking333]

The new field piece and navac ones are really nice . The one is most commonly see in the field is the Appion G5 Twin . If you’re going to invest one , make sure it uses a DC brushless motor as well as your vacuum pump . Reason for this is the new line of refrigerants coming next year to replace r410a are classified as flammable and the manufacturers only want brushless motors used so there is no chance for spark ignition ( even though a spark wouldn’t ignite them anyway , it’s a safety precaution )

[@lammaking333]

I’m the channel creator , this is my personal profile ( sorry I was signed into the wrong account when replying

[@s.j.5850]

@@lammaking333 Ok, thanks. Appreciate your advice.

[@jimdavidson5208]

Dog, you are slugging the crap out of that tired compressor. Low side over 211psi while gassing LOL. Just saw the now 422B. Must take liquid I guess. Still you need to throttle it down if you must charge with a liquid depending on gas types.

[@MsckMatt]

I also thought this, Ive also seen old school guys at my shop do the same thing. I add refrigerant so slow, then i watch these guys dump 4lbs pure liquid in one go and it ends up being fine. Still makes me nervous though

[@dfwhvac]

Yes liquid charge for that refrigerant , and I don’t have time to weigh in ounces at a time for a job like this where the unit is already junk , it’s hot as balls on the roof , customer saying get it going we’re hot in here and we have a meeting at 3 pm, and is set to be replaced . But yes you are right , charge should Be throttled in through suction by the book. Thanks for watching sir.

[@jameslang9170]

It was overcharged if txv. 40sc

[@kennethlobo4420]

Just a question when ubreplace the refrigerant R422 is there any other adjustment u havevto make?

[@dfwhvac]

Not for r22. If you have an r22 txv or piston , no adjustment is needed. Evacuate system , replace drier , weigh in charge as liquid close to but a little under the original charge weight , then throttle in remaining charge through suction until superheat / subcooling values are in range depending on your metering device .

[@HHS-LLC]

It's only that easy when you are using the setup you are using (MQ converting with p/t programmed in). If you are using simple manifold gauges, you need to convert pressure values to temperatures using the pressure temperature chart for R422b (Nu22b). It is not exactly the same like many think it is. www.freon.com/en/-/media/files/freon/freon-mo99-nu22b-retrofit-guidelines.pdf?rev=cb47ceae0ca247879c21e65941aa1546 pgs 13-17 Thanks for the video. Great diagnosis and info.

[@Mike-yh8tv]

Thanks man! Great videos, lots of detail! Especially on the non-condensible, troubleshooting. Thanks 🙏 keep up the good work!

[@dfwhvac]

Thanks for watching! It’s not often we would run into an issue like this, but it can be tricky to diagnose unless you gauge up and watch the performance. If you’ve verified airflow is correct and your head pressures bounces up and down dramatically back and forth non stop , it’s likely non condensible. A restriction would have weird pressures , but they would usually be stable and not fluctuate like in this video.

[@Mike-yh8tv]

@@dfwhvac will keep in mind if I come across this issue…thanks

[@jamesfitzsimmons381]

I could only catch a glimpse of your outdoor motor restarting g after you reset hps looked like wrong rotation ( you did say motor was replaced.

[@dfwhvac]

It looks like that because the fans spinning always looks weird when recorded on video. The frame rate can’t keep up with the rpm and it will make it look like it’s moving slow or backwards , but rotation and air flow was indeed correct . Thanks for stopping by

[@jamesfitzsimmons381]

@@dfwhvac thanks for letting me know was a good video

[@dimogeorgiev1420]

Hi what is the app that you used. Thanks

[@dfwhvac]

Hi thanks for watching. That is the measurequick app. There is a free and paid version . It is compatible with different brands of Bluetooth testing equipment

[@joshwf41]

You should never scale in refrigerant with the scale in its case. The weight will read wrong.

[@dfwhvac]

As long as it is level and on a hard surface I haven’t experienced this problem with this particular scale and case as the scale sits freely in the case and it is a rigid case that doesn’t bend in , but I can see your point on it having the potential of messing with the readings so I will keep that in mind and remove it from the case just from now on, thanks for watching and commenting

[@jimdavidson5208]

750 mics and you added gas to it? Little high there to be adding gas so soon. No leak checks either? Guess you can always charge the customer for more numerous gas-n-go's LOL.

[@c21meister]

You’d never be able to achieve a vacuum with a hole in system

[@MsckMatt]

This is a pos on the end of its life, with a history of a leak just buying time for a replacement. Sure its not perfect, but you can only do what the customer will pay for, and you gotta do what you gotta do. That system wouldnt have gottem much lower even if you ran the vacuum overnight with a known leak

[@dfwhvac]

That was a hurry up and get her done job, as in we want it running asap , and we don’t care how. System got replaced later that month when we actually got the equipment

[@dfwhvac]

Yessir . Not every job is going to be text book perfect when it’s over 100 outside and they need something going asap Until they can replace the equipment.

[@junior-hk2jt]

Wow.... Ghetto ass roof😂😂😂

[@dfwhvac]

They have about four buildings total on this complex and that’s the best looking one 🤣 💀

[@dfwhvac]

We literally have year round work from this customer . Whoever managed this facility before us left a lot of money on the table by hacking all this shit up lol