I'm gon na go ahead and purge first bring this up here to a purge level and that's just gon na quickly push more through the lines to get any air that's sitting in there out and when you're ready, you're gon na adjust it down to actually brace Hey guys, it's Burt with HVAC school today, I'm having a little fun putting together this piece of work here check this out. I got a line set 50 foot that I'm attaching to coil I'm putting this together for the a HR conference in Orlando for Jim Burgin, but the great opportunity to show flowing with nitrogen while you're brazing. We don't have a video yet where any of us over here at HVAC school, show you how to braise while flowing nitrogen. So this is it.

This is the big one. Okay, so whole process start to finish with flowing nitrogen while you're braising. This is not your typical setup, as you can see this is you know I specifically put this together for Jim for demonstration, so you would normally have your suction poured out at the condenser and your liquid line port. What you want to do is remove.

The straighter. Is out of these ports anytime? You have a copper, open, you're, pulling a vacuum and whenever you're pulling a vacuum, of course, you're pulling those traitors right, pull your strainers out first step. Second step we're gon na purge the line we are going to get flush out. The oxygen so oxidation will form if you have oxygen inside your lines, and you start braising it'll form so that black stuff, that you see on the outside of your copper, that you can just like rub off when you finish braising that forms on the inside of Your copper as well and that that's from oxygen in the air.

So what will happen is if you flow nitrogen through these hole lines and there's no outside air. Getting in no oxygen is only a nitrogen. There. You'll have a perfectly clean braze on the inside of your line.

Don't when you're coding the inside of your lines with oxidization, that's forming on there, then it breaks free when the refrigerant passes through it actually pushes it into the TX V's and into the screens. Any small area that it can clog it will to avoid that problem. You flow nitrogen while you're braising. So to do this, we have our nitrogen here.

So right here is our dial. This is the Western nitrogen regulated it's fantastic. I have purge braised and off or test. I turn it to test.

I can fill up the lines with high pressure or I can below lines out or purge, or I can turn it down to braise and it'll just trickle out threads on by hand right here. You know it's really easy to get in and out of your nitrogen tank. I got mine off a true tech tools, calm, so I'm flowing into the blue here, and I got a cap on this side. So it's all gon na be forced out of these two right here, switch that to courage.

Now it's just pushing pretty low pressure still, but we're just purging all the air out of her lines. In the meantime, I'm gon na put a little wet rag. Okay, I'm done. I can just take that right off of there and stick it back in here and reuse it.

So when you are hooking up the nitrogen to the system you're starting to flow it you just want to be thinking about. Where am I putting it in which direction is that going to go, and where is it coming out like in this situation, a little different than what you typically see, but I'm going in here to the suction line, the nitrogen is gon na flow in and go In both directions, one it's gon na go through the coil and come out of that coil and up here through the one brace that I still have to do and through the line set and then out to another brace that any in the nitrogen. The same time is flowing in through this line set across this brace that I still need to do all the way through that line set and to this top brace here that I still need to seal up. What you want to do is you're gon na open one port, pull your nitrogen in and then you're gon na have the straighter removes from the other port and usually open it.

Remove the straighter valve and nitrogen can just be flowing out there. I'm ready to braise. Now so I'm gon na set, it turn it to brace, and this actually slows down the flow you're, usually between two to five cfh cubic feet per hour. This is what I had before, so you can use any kind of regulator and then hook this on.

You set it just barely floating and you're flowing nitrogen, while you're brazing don't just get at setting the flow. It's really low. I mean you can see in my my gauge right there. It's it's zero, mygait! Just don't even know this is happening so get yourself a tool.

You can use all the time. Something easy like this. Let me just show you how this one works all right, so let me set turn this back to perch. I get a little bit more pressure.

Feeding into here all right, so that ball has flown up because I'm flowing too much air through right now, there's tighten it down there, we have it. We have a floating ball, we're ready to start raising there. It is my little regulator. Ball is still floating and I've raised all of my joints in and I'm not gon na cut any of these open.

This is my work of art here. This thing that I got going on here, so I'm not cutting this open and showing you, but I did each one of these joints are gon na be beautifully clean on the inside. I got some of these really hot on the outside here, so I could just demonstrate this right here. You see this flaky oxidization buildup on the outside.

That is same thing will happen on the inside of your copper, if you're not flowing, if you have any oxygen on the inside Moisture oxygen, things like that, oxidization is gon na build up and then the first time that refrigerant flows through there. It knocks all that loose, come off start, clogging up your screens and you're on your txb. So okay, I just pulled up on one of our install, should be right about when they're braising. I was in the area and he said they're gon na brace it.

So I came over only get a in the field, video of flowing nitrogen. So let's go. Let's go blessed grants trainee outside convinced there see, if he's actually blowing Brian I'll just bust in the show. This is the victor 2.0, the victor edge 2.0.

Oh, this is a nice one. This is a great regulator. You can thread it on by hand here, so pull it off. Every time you put it in the vehicle, you noticed I'm screwed you're gone.

It also has your very precise flow rates here for brazing. As you can see, the brace efh, which is cubic feet per hour, have a range between three and six, so it's hardly any flow at all, but you want that, can a precision. It looks like just about the start. That's great amazing timing.

That's how they roll so we're not quite connected up here. You want to make sure everything's off the copper. You can actually flow, pretty crucial want to make sure. That's all clear.

Yes, just make sure your coppers all click it out and you can actually slow important. First step is to remove the straighter from each side, so they've both been removed and then you can flow nitrogen through and right now. Let's see we got a brace here and it looks like another connection coming out of the chase. This is a reused, clock application building we're up there.

We've got a couple braces out here. The air handler is not quite in yet so what you're gon na want to do is you're gon na flow nitrogen into this port. Here for this brace and this brace and it's dumping up upstairs, you know it's open at the air handler not yet connected and then when it's time to do this side, we'll just switch this over here flow across this joint, I'm freezing and then once the air Handler is connected. You can just flow into either side and have it dumping out to ever port.

You have open with a straighter removed. It's important to just think about which way is my nitrogen going in what is it gon na hit? Next? Is it open at the top? Is it still sealed up there if you've pushed copper lines and the other end is braced shut, you don't want to start flowing nitrogen into there so make sure it's open. It's actually dumping. If it's all connected at the air handler.

That's great it'll push through the evaporator and come out here and dump through this port, which is what we'll do when we're brazing in the air. That's all set up right now, let's get this actually turned on. So this will right here we have plus minus start out making sure that it's pretty much off cool and then see how much pressure we have in our tank. This one has just over a thousand.

Yes, I will adjust start flowing, I'm gon na go ahead and purge first bring this up here to a purge level and that's just gon na quickly push more through the lines to get any air that's sitting in there out and when you're ready you can adjust It down to actually brace grant's regulator is really nice. We are ready to braise. Will you squawking it? Okay, okay, all right, sweet, it's all hooked up! So now we can just feed into one side and it'll flow through all the way out to here cover the end of that. Oh you did Wow, it's all hooked up.

So now we can just feed into one side and it'll flow through all the way out to here just wanted to show the flow direction. So we have coming up from the chase we're flowing right now into our suction and it's going to go through the coil and then from the coil out through this GXP. It's going to flow through the TX v out through the liquid line, like that. So all of your joints are currently being passed through and then it goes down to the condenser.

It dumps out that open port, where we have the straighter room and on a liquid liner, we're ready to braise here right about four cfh cubic feet per hour. The air handler is currently being braised in, while it's flowing through and out right here on this side, all of our oxygen out. We won't have any oxidization build up inside our line. I was going to show the process if you are doing a compressor, so I pulled off the top.

So you have a lot of raises in here. It's very important to to flow and keep those lines perfectly clean as well. Blowing can be a little bit different. So you just you think about where am I putting it in and where is it exiting? Is it coming in in a way that it can actually flow through and exit just be thinking about? Whatever your project is you got to flow it across that joint? You have to have your other side completely open, you know straighter out or a line open.

That way you have a really smooth flow, very straightforward, simple process.