HVAC Basics: Skills Brazing the AC System Line Set while Purging with Nitrogen using the Flow Guard
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- เผยแพร่เมื่อ 12 ก.พ. 2017
- This video shows the students how to set up the flow guard to the regulator on the nitrogen tank for the purpose of purging the line while brazing. We also show adding the armor-flex pipe insulation and holding it back with a tubing cutter for brazing the line.
It may be a few years, but these kids will come to appreciate how good their teacher was.
LEO ASHRAE I'm in HVAC school now and I wish I had him as my teacher. Great teacher!
Thanks Danny. Very nice of you to say. Good luck with school!
Thanks Leo. Very nice comment.
LEO ASHRAE if they stay in the trade
Im not even an hvac guy, but I thought the guy was a bit rough. Then I realized this is the demo before they have to do it themselves. These guys will actually be learning thanks to him, so A++ To the teach =)
Nobody sits down! Unless you're driving. Love it!
+CheckmateGamer 👍. Thanks for watching and the comment.
I teach in a technical school.
I find this comment to be in the true tradition of the master class. That is to have obedient workers first and foremost.
After over 50 years of witnessing the demise of the working class in wages, and the outright offshoring and outsourcing of our once mighty industrial manufacturing infrastructure, I can't help but be repulsed by efforts to mold workers into good little automatons.
Other than that, I'd say the video is a top notch lecture.
EXCELLENT Instructor! Stern & Old-School Ethics
This old school baby boomer hazing is a huge turn off to people entering trades. Quit gate keeping work ethic.
@@moroteseoinage exactly, I couldn't explain it better
This is the best teacher ever. I'm not even in HVAC, and I find this educational and interesting.
Great video. Will be watching them all. I wish I could attend your class! Thanks for taking the time to record these.
+Don Brooks thanks for watching and letting me know. Nice of you to say!
One of the best teaching I've seen. Slow step by step instructions. Ensures everyone understands. Excellent 👍
“Very rare out in the field do we swage” service techs do it all the time. Some of us installers do but “very rarely” is a major understatement. The idea is to have the LEAST amount of joints possible. That’s less joins that have the possibility of failing during the life of the unit. So yes we do swage. All the time.
Gregarious Antithesis. Yes we swage more often than not. Are we saving money on elbows and couplings? Not sure but "bending tool" bends are much easy to slide the Arma flex on. And less brazing is required, less chance of leaks. There are good Rothenbergers out there now to make it easy
Are these high school students? I wish I would have a had a class like this in hs. It's literally criminal what some high schools are doing with kids but this is beautiful this is what makes America great.
I got taught all of this on the job with a small company just me and my boss working and he taught me everything in the video exactly how the instructor explained except for the brazing with nitrogen very good video
Alex Rivera so did you just braze without any nitrogen?
Great teacher! I only saw 1 thing that he should of done differently, & explained.
When he sanded clean the line set at about 15:30
he did not make sure that the opening of the copper tubing was pointed down, or in the sloped, downward direction.
It is very important that when sanding clean, copper tubing....that the opening of the tubing be facing the ground, or facing toward the ground as much as possible. This decreases the chances that any small copper shavings /or debre from the sanding tape do NOT end up inside the copper tubing.
Small shavings &/or debre is all it takes to restrict a metering device; plug up the mesh screen on the inlet of the compressor.
It really is that crucial!
You always want shavings/debre to fall toward the ground & not fall back into the tubing.
Other than that, the teacher was phenomenal!
This will be good teaching practice if the kids were asking questions but you are excellent instructor . ""No body sits down , ""love this phrase
Great teacher. Most people in fields dont do the nitrogen cause of the extra steps. Glad your enforcing this it makes a big difference in longevety in the components, screens, and leaks. Hopefully they stick to it in the field.
ive seen many many many many many 410a units that were installed over 10 years that were brazed withought nitrogen, and still running strong. But nitrogen is way to go.
Microchannel evaporators lol. @@freeguide4051
⚠️ This Instructor is a MASTER of his trade and an AWESOME INSTRUCTOR!
(from an ancient and retired sparky)
I wish i had you as instructor, sir. Fantastic class, thank you! Learned from your videos!
I'm 6 months in at a school called brightwood Institute in Philadelphia your videos has helped me a lot and I want to thank you for taking the time out to do them you're a very good instructor I just wish you had a lot more videos
Great video.. ..just subscribed because of how right and detailed you show how to braze with nitro.
I wish I had such excellent teaching for my hvac/r course!
I think you are instructor of rac trade
I also instructor of refrigeration and air-conditioning trade instructor in government industrial training institute in ahmedabad in india
Best effort sir thanking you
Awesome video! Felt like 1 of the students. Good job maestro!
Nice class and very good instructor 👍👏
wish I had you as an instructor. I could've saved myself the embarrassment of feeling like I didn't know anything the first couple weeks on the job. great explanation, and awesome teaching!
+mike martinez thanks. That's really nice of you to say. Take care!
You didn't really know anything the first few weeks on the job because hands on- on the job experience is the only way to learn. I've been an HVAC installer / service tech for 15 years and I never went to school for it. Everything I learned was from watching the people I worked with or self taught. After being a helper for one year, I moved up to lead man and ran my own jobs. I do rough in's and change outs by myself without a helper. I did get my universal epa certification after a few years, but that's much different than this class. Next, I'm getting my NATE certification and eventually my contractor's license. This guy is a good teacher, but the only way to learn the trade is through hands on experience, and a lot of people aren't cut out for the HVAC trade.
Very Good Video, Very Informative, Great Teaching with positive enforcement and positive criticism.
Knowledgeable instructor, very good professional lecture
Great instruction sir! Enjoyed every bit of it!
hes making men out of these boys. salutes to the professor
You are changing lives sir. You are doing it right! Kudos.
Thanks Carmelo Jurado!
Great video! You are a great teacher.You keep your students involved and you are very good at teaching them the right way to do things.I liked when you said there's no sitting in hvac except when you are driving.lol! Keep up the good work and keep these great videos coming.Have a great day!
Nice and quiet someone is focus...dont sit down! Good maestro👍
Awesome instructor!
Excellent instructor.
love the videos very well explained!!
Perfectly done. Good teacher. Everything explained properly
I have noticed right about the time the flame turns green is good. Thank you for your videos.
That is more soldering than brazing... It's the flux that makes the flame green.
@@NETWizzJbirk solder makes it green. Not flux
Really good at explaining everything clearly - you are vary Articulate Sir !!!!!!
bad ass teacher!! those kids have no idea the great teacher they have
I feel like going back in my first day of school back in 1980 !
Great teacher, many thanks
These kids got it made. The university where I attended was cheap. The equipment was junky & gutted. We didn't get new copper. The dean told us that if we wanted new copper to use on our projects, that the university would raise our cost of our tuition.
So we could only use scrap copper that we had to scour through in a recycled copper bin. Then we had to braise a million & 1 scrap pieces together, because the longest piece of scrap copper would only be like 6 inches or so.
The split systems that we had to install were junky. None of them worked. Before you could even start your project, you had to fix the condensing unit/heatpump, & the gas/electric air handler.
Parts would be missing; like defrost boards, electric heat strips, idf motors, etc....often there was NOT a wiring diagram & you had to go looking for the part you needed & take it off of a unit somewhere else!
Then after you found what you needed, you'd come to shop class the next day, just to find that some ass hole gutted your units after you left!
& they only gave you like a week to get it done, or they'd fail you.
We complained to the dean, who was an HVAC/R his self. & his attitude was, "Well, you can either complete your projects, or you can't!"
It was ghetto & borderline scandalous.
We had to make our own thermostats out of blue plastic gang boxes, 2 way & 3 way toggle switches & t/stat wire.
We had to wire up, not only sub panels, but also the main breaker box as well.
Again, we had to go around looking for the correct size & type of breakers.
Rob Peter to pay Paul!
-That's how the entire shop was.
They also didn't have enough torches, jugs of freon, vacuum pumps, refrigeration wrenches & hand tools for each student. So we were all fighting each other just to have what we needed to work out in the shop, on our projects.
Students started buying their own hvac/r equipment & tools & bringing them to class.
The university wouldn't even supply us with meters.
We had a fuel oil furnacee blow up, literally just 10 feet away from where we were standing.
It blew a round, metal, circular, razor sharp, duct out of the supply stack coming off of it. That thing went flying across the shop like a saw blade that was thrown like a frisbee!
Luckily, no one was cut by it.....or decapitated.
Prior to it blowing up on us, our instructor told us that the next day we would be going over fuel oil furnaces on our power point slides; & to go out in the shop & plug it in & take temp readings on the supply duct & electrical readings on the fuel oil furnace.
So we plugged it in. It had a suicide cord installed on it & the unit was setting on a 4 wheeled dolly. We were just getting ready to get some temps. We walked away from it to go to a table to look up some info from our heating book, & litterally a few seconds after we walked away from it, it blew up.
The unit blew up off the dolly; yanked the suicide cord out of the wall socket; blew out the razor sharp, metal damper; a big fire ball blew out of the supply duct as well. The concrete slab of the shop, under our feet shook. & the noise was deafening.
We were scared shitless to go up to another fuel oil furnace after that.
On another occasion, 1 kid damn near killed his self because he got his meter leads into some 230 volt live circuit, & his meter was set to ohms, not voltage! He was temporarily blinded & it killed power to the entire building. We called him "sparky" from that point onward.
People were getting shocked because previous students would rig their projects so that if anyone touched their unit, they'd get lit up.
The instructors knew this stuff was going on, but their attitude was, "Well ya gotta be careful out here. There's a lot of dangerous stuff setting around & sometimes students do things that make stuff unsafe."
So much freon was vented out in that shop, it wasn't even funny. Our instructor for that class was just like, "Well if there is a hole in the ozone layer, its probably right above this university!"
Another instructor was transporting 100 lb drums of oxygen & acetylene tanks on a pallet with a fork lift. He wasn't driving his lift backward, but rather forward. So he couldn't see where he was going. He crashed right into a condensing unit & all the 100 lb bottles fell on the concrete floor of the shop. They were full, too! Had even 1 ruptured, myself nor any of my class mates would be alive. So we dodged yet another bullet there.
It was such an (expensive.... $20K+, dangerous university!)
They didn't have enough parking spaces for all their students to park, each day. So we were forced to park off campus. ANYWHERE off campus that you parked, your vehicle would be towed.
The university set you up to fail by not giving you enough resources &/or enough time to complete your projects. If you were getting financial aid, & ended up on academic probation....forget about it! Once you ended up on it, you weren't getting off of it. & you'd lose your financial aid.
I graduated, somehow. But I'll never forget how shady that university was!
It was the University of Northwestern Ohio (UNOH) in Lima, Ohio on Cable Rd.
It was ghetto & shady big time!
Adam Spears everything you described sounds hilarious and it also sounds like the company I work for right now. It’s a real shit show
Very nicely presented!!!
Asking alot from the class that isn't already what should have been at hand need this you have it..
Wow really good teacher good job to the teacher kids listen to this man teacher like this are hard to fine trust me
Excellent teacher.
Fantastic video
Thanks!
Those guys are like " are you almost done with the talking we want to go play Pokemon go , lol😂😂😂😂😂
Great Video, it seams like these kids were scared of their shadow. Speak up, ask questions, i learned brazing on the field. My boss was cool as hell, showed Me everything. If you leave the torch on the line for a long time, you’ll burn a hole in it. I’ve done it. Show them how to cut register square holes, for the boots, and get them perfect, in front of the pickiest annoying home owner, on new construction.Thanks for the Video.
Grande Maestro!!!!
Respect teacher
Great lesson
Loved this video. Great lecture that was direct and to the point. I am a graduate from a tech school and never had a lesson explained like that. Learned a lot from this, thanks!
good job. thank you.
Great video
Great clip!!!
Your GREAT. If you ever open a Week-Length course. Please let me know.
Good idea to backseat the nitrogen cylinder, as it's a high pressure cylinder as well.
Nobody I know uses couplings. They are an extra cost, and more importantly they are two joints in the system as opposed to a swaged connection, so more potential for leaks plus restriction/turbulence in refrigerant flow.
Pressure testing to 150 PSIG is quite low, especially for a 410A system. Minimum I do is 300 PSIG.
Otherwise very good instructor and well presented!
Im going to say its an r-22 since theres a green sticker. He got 150 psi from manuf. data plate.
Thanks Great presentation. How about explaining the different type of fittings and how to bend the line set??
Great video! Thank you
+alchemy philosopher's stone thanks for watching!
Very nice. The only exception I take is your explanation of the "carbon" that forms on the pipe. It's actually copper oxide that forms when the hot copper reacts with the oxygen in air.
A competent man.. The nitrogen isn't so critical with American copper as it is cheaper stuff. There is another video on TH-cam showing brazing vs soldering in which you can see with good copper the oxidation is very minimal.
On a brand new unit, yes.. Braze with nitrogen.. On R-22 or an old system, SB 8 without nitrogen will be fine.
Overall, good guy, he is trying to help and give his students their money worth.
Very good video edisonhvac thanks...
Thanks Pedro.
I have a small crack in the liquid line at the bend just above the compressor. tight spot, wondering if I should use 15% or higher and also a jewelers torch so I can avoid over heating / damaging the compressor? Did this happen because the 3 compressor anchor bolts were tightened down too much causing too much vibration on the liquid line.
Thank sr.great job good video to
very nice
i im happy to subscribe to this Chanel !!!
Man I wish I had that going for me when I was young.guys take advantage trust me even if you do something alse you will use those skills when you ha e your own home will save you money
that one Damn Good Teacher !
I was taught that the copper oxide that forms inside the pipe if you do not use a nitrogen purge actually is a conductor of electricity. It can cause a motor burnout when it ends up in the crankcase oil, along with plugging up screens and filters. The instructor is correct not to teach swagging pipe. That process actually weakens the pipe, and in 30 years in the field, I ran lots of copper, and never used it. I don’t think that process would meet spec. On a lot of the large commercial jobs we did.
just for saying it because its true ,,,we never had any compressor issues of failures because soldering was done without nitrogen ! just saying ,,,,its better if you use it but dont worry yourself to death about it ,,,,either if you dont have any on hand ,,,,,argon works great of course it just stops the flame from forming cause its has no oxygen for the flame to appear when welding ,,,,you guys have a great teacher listen up and learn i am old and retired ,,,,,thanks
Good vid
Insulation on the suction line also helps maintain proper superheat at the compressor especially if lineset is in the attic.
Thank you!!!!
I want those blue tubing cutters!! What brand are they??
Is there as much capilary action with the 15% sil phos as with regular solder for like l pipe for plumbing
+trukin forever not as much. Sometime when the heat isn't just right it seems you have to chase it around the pipe. I rushed this one.
There's another more important reason why we put insulation on the line and that is to keep the line from absorbing more heat on long lines so you do not add more super heat to the compressor.
the instructor said that in the class. someone isnt paying attention!
Really??? A sanding disc? LOL. I like this guy!
For refrigerator pipe lines brazing time also can i use this same method means nitrogen purging.
Looks kind one of my Union Sheet Metal service classes
What school do you teach at and how can someone sign up to go?
Solid.
Good teacher, notice how focused the students are?
He got upset someone was sitting lol
I hate it when my helper sit down. I do installs every blue moon.
I just got a job teaching HVACR at a local two year college. Is there any way I can reach you for some help?
What type of gas you used to welding the pipe ?
Wow idk how I never thought about using the tubing cutters to hold the insulation back lol #tricksofthetrade
2:12 What happens when you braze the pipe, some kid said it gets hot lmao.
Great teacher. Could teach here in Germany too. By the way what type of nitrogen do you use in the states for brazing for example the one you used? Over here in Germany we have different types of cleaner once. For example we usually use 5.0 means 99.999% clean. Thanks for an answer
I try and get the wires as far away from the flame when brazing as possible
I didnt use a single fitting when putting in a heatpump for my uncle, no swages either, benders and straight into the equipments. It was a cut-in job, so new lineset.
Khoa Tran every install is different, but that is always nice, especially when taking inventory.
To the techs. I just bought a home and am wanting to get AC installed. The home came with copper ran already, the home was built in 94. I am wondering, do I need to run new lines or is there a way to clean the lines? The reason I am asking is because I want to do as much DYI as I can to lower installation costs. Most feed back would be appreciated. Thank you.
Yes you can keep the lines, just need them to be flushed with nitrogen and make sure they match the requirements on the new unit.
i believe that older lines if formally R22 the lines also need to be cleaned of the oil used in R22 systems if the replacement system is R410A..
I'm studying for my EPA exam are all your videos in order for the actual exam to study? I have actually watched two so far and you have explained very well.
+George Garfias click on the playlist below and it has all the videos in order. Thanks!
Check out this playlist on TH-cam:
th-cam.com/play/PLPtSfyDWpCHfUFTfgUm7KuDNUa5XWylWy.html
How did your exam go?
No exam are questions environmental and some chlorine che
Pass that no ac known
If you slice the rubertex, you should use rubertex glue to seal it back.
Not trying to nit-pick your video, I actually really appreciated how you stuck to protocol in your training but just wanted to point out some details to viewers as details are important: One is you're not brazing with nitrogen but brazing with acetylene while purging with nitrogen. Next, about a 30 second initial purge @20 psi, or maybe it's cfm, to get that initial oxygen out then step down 1.5-2 psi continuous purge while brazing but no more as it potentially cools the brazing process and could blow out the braze joint inhibiting the capillary action of the sil-fos. I mention those numbers in case one is using traditional manual set flow-meter. The other point worth mentioning is to stand out of the way (to the side) of the regulator adjustment knob while turning on cylinders and to be sure to open slowly and completely back-seat the oxy in contrast to only 3/4 turn on the acetylene. Might also suggest flame guard on the unit while brazing that close as you mentioned not leaving burns on customers new equipment.
+Tie Dye nice details. Thank you. I will take the information you just provided in to account when I give my next lesson to the students. Appreciate you watching and the feedback. Thanks for the comment.
It's true, but part of the job is having enough common sense to know nitrogen doesn't burn. Realistically speaking, helium, argon, or any dry and inert gas would work though the industry standard is nitrogen and it is also probably the most abundant and environmentally friendly making up 71% of the air we breathe..
Can you braze without taking the refrigerant in the system.
Great vid
One note from a welder,is NEVER peck on your work with the torch tip!
Armorflex should be glued back together with a neoprene contact adhesive, not gluing can still introduce moisture and then sweating potentially in a wall or ceiling.
Lets see you braze the joint MR. shop!
Heated copper metal reacts with oxygen to form black copper oxide. This will happen on the inside of tubing that's being brazed if it is not purged with nitrogen. Purging means you have nitrogen flowing through the tubing during the brazing which pushes out the oxygen from the atmosphere. If it forms, the copper oxide could travel along the line and eventually clog the expansion valve resulting in poor or no cooling and possibly damaging the compressor.
Few things I would of done different but that comes with leaning the trade. He’s got to teach them the “proper” way over all good video seems to be a excellent teacher.
Good teacher, but geez are those kids all there and paying attention to the previous classes??!!
Don't sit down know one in hvac sits down unless your driving that was funny
IMO to swage or use coupling is a nit difference to turbulence or cost, and if you make one good braze you probably can make two, and two or four the lines still need to be tested. However, flowing nitrogen is a biggie and should never be skipped.
How can we tell nitrogen has reached the far end by the brazing junction?