Hey I'm Brian, with hvac school and today we're gon na. Do a demonstration of the NR DD recovery machine. How well it works it's extremely fast. It has a very large condenser coil in it, which helps saw a lot of the trouble that we run into with recovery machines.

But easiest thing to do is give you a demonstration to show it use in the field. So here we go alright. So we are here today, looking at the Nav AK and our DB recovery machine, a lot of nice things, a little extra adapter pose to go with the little quarter, inch flare dryer. It also has the connecting cord that connects if you have a recovery tank with a sensor in it, so once it fills to 80 % full, it will shut off, which is nice that attaches right here.

I know a lot of you: don't have those in the field. In fact the one I'm going to use today doesn't have that. But if you have one like that, that's great got some spare screens just important to keep clean. It's a digital display device.

It's got self purge. You can put it in liquid phase when you're originally recovering liquid, to help keep from overloading the compressor. It's got. A nice DC compressor, really good device.

We're gon na show how fast it works on this system. Here we're going to be recovering. The charge out of it, this is actually a system that I've had some issues with and we are gon na need to replace an expansion valve on it at some point. But I want to see whether or not the charge that's weighed into it.

Is the right amount of charge or not, and this is gon na - allow us to do that nice and easily scroll compressor so pumping it down. Isn't the best bet so we're gon na use this and pump it into our tank and go from there way in and way out is huge on these? You can see this factory charge is 5.6 pounds and the line set is short on it. So we should really have a factory charge in this thing, always shut off the disconnect and test for safety. Alright, so let's review what we need for a proper recovery.

Obviously, we've got our recovery machine now, back in our DB, we've got our hoses in this case. I'm not going to be using a manifold because I've been into using probes primarily lately, but it's a good idea to pool your course when you're recovering and when you're pulling a vacuum. What you're going to need to do after your recovery anyway, or whatever work you're doing on the system, so using core remover tools earlier in the is a great way of doing it. Plus you got an extra side port where you can attach your gauges or probes, and now once I pull the core, I've got free flow right through here, so I'm gon na pull the core, and then I'm gon na remove this back part here and that's where I'm gon na connect, my hoses that are then gon na, go back to the inlet on the recovery machine and then out to my tank.

Now there's a lot of talk about you know which port on the tank. You want to connect to keep in mind that probably the best way - and this is you know what a lot of people have talked about - is connecting it to the vapor side and then inverting the tank, because there's a liquid dip tube inside of this tank. That's connect as a restriction, but it is better to add your refrigerant into the liquid side, so putting it on the vapor side and flipping the tank is probably the fastest way for general situations where you're not recovering a lot. It's probably not gon na make a huge difference.

Obviously, if you're recovering a lot of refrigerant, you need to think about how big your tank is. This is only a five pound system, so when we got a brand new tank, so that's not going to be an issue, but that's something you want to consider. Obviously, if your tank isn't under vacuum, you need to pull a good vacuum on it before hand. Down to below 500 microns got to have a scale.

I'm gon na use the nav AK Wireless scale and then, in this case I'm going to use a tee that I'm going to connect to the inlet port, so both of my hoses can then go into this tee and I've got no Schrader's in the tee. This is going to be open, full flow into the system and I'll do my turning on and turning off at the core tools. So I can do some core tools kind of as my on off ball valve, but then I'm going to connect my probe to these side ports here. In order to get you know, access now the digital display.

You don't really need to use gauges because you can actually see where you stand just here on the digital display. Another thing that's gon na be worth noting is that in most cases in air conditioning applications you only have to pull down to atmospheric pressure. That does vary depending on the type of refrigerant and you're gon na want to refer to whatever the codes are in your country and for in the u.s. it's the 608 EPA requirements, you're going to look, look at the recovery requirements, or actually they call them the Evacuation requirements sort of a funny term there that the EPA uses, but you have to look at what level you have to bring it down to this system, is going to automatically the NR DD is going to bring it down very low to comply with all of The requirements - I just know that in most cases for comfort, cooling and residential, like commercial applications, we only need to bring it down to zero psi, which is where I'm gon na stop.

Today, let's go ahead and get started with this all right, so this tank needs to have a vacuum pulled on it, because it's a fresh tank, so we got our nav AK. Digital vacuum pump we're going to pull her down really quick. They need EMT to start working out all right. So, while I'm letting this pool down we're gon na go ahead and set up the hoses and the recovery machine, you can see we're reading a lot lower at the pumps and we are on the tank because, with the tank you have the pressure drop all the Way through the dip tube, because we're connected to the liquid side here and there's this dip tube, we goes all the way down into the tank, which is why we have that differential between what we're seeing here and what we're seeing here at the pump.

But we'll leave that on there for a little bit, we'll pull it out nice and deep and then we'll be ready to use it. So on this dryer, you don't want to open this up to the atmosphere unless you're, unless you're, using it to kind of prevent it from being contaminated. Now this one is so small that may not have any desiccant in it, but you can really use any quarter-inch Claire dryer for this purpose, and I would actually suggest, as you go on, maybe get a larger one. Have a typical size with quarter-inch letters on it and that way you'll get a little bit more flow through it.

Another thing is when you actually charge out of your recovery tank, it's a good idea to charge through a filter dryer, not that it makes a huge difference, but there can be sludge in the bottom of a lot of Tanks. Some companies don't clean them out as well as they should, and you know you don't you never know what those tanks have been through. What kind of sludge has been pulled into them? So it's a good idea to charge through a filter, dryer and keep a couple of these quarter-inch floater drivers on your truck as they become contaminated, as you start to see a pressure temperature drop across them and then just replace them getting new one. That's the core level before and I just leave the core on the court remover and just kind of set it like this on top of the condenser.

So that way doesn't get lost direction of flow is in this direction. So we want to point that in pointed in and then in and now we just chose going out to the tank cores are removed. I have the these just connected on the ports, which really is unnecessary just in case. I wanted to see the pressure once we get all done.

We got to pull the vacuum on it, so that's really what we need those ports for is for our micron gauges gauge or gauges, but you can see we get a nice deep vacuum now. So we're ready to use this tank to get the job done. You'll notice, it does start to creep up just a little bit we're at 1:27 now, but it's a nice, nice and dry. So now it goes out to the tank connected to the low side flip.

It upside down, which again it's a source of a lot of questions. Why is that best? I mean it's best by a very small margin, so I wouldn't believe it closed for now until I purge it before bit put it on top of this, which this scale is pretty cool wireless module right here, which is really nice and that's also got a little Little kickstand on it to sit that right on top or wherever you want. You know synched up so it starts reading one point: two ounces: so I'm going to hit the Clear button for the buttons right here: okay, I'm gon na go ahead and open these valves. So that now meeting refrigerant through kind of the first one first through and now, I'm see if it purchase through here.

I don't think it really can it's not gon na purchase it yet on there. But our main disconnect switch Court is in Nice and snug, which is always important. Now you see this nice big display, so we're gon na start it recover. You can see.

Now we have outlet pressure, we're gon na go ahead and purge this tank all right. So we've got it zeroed out, got it open on recover. Tank is on the scale we are connected, which you can see here and she's, but both the controller and the scale are connected. So now we're ready to start her up, which is really easy.

Just hit start see showing you the inlet pressure here and then the outlet pressure doesn't sound like it's fogging something's gon na leave pulling out of both sides, no fours, rather than let it keep running. You can see we're on the negative. So I'm gon na go ahead and just kill it so we're good to go now. I'm gon na go ahead and shut off my core tools, just to make sure that nothing sucks into the unit at all and I'm gon na check and I measure quick app.

What the pressures showing at the system just to confirm! So it's about perfect, I'm showing on the system that we just have a tiny bit of pressure on the port, so we're good to go ahead and do whatever we need to do on the system. In this case, I'm replacing the expansion valve and, like I said it's not usually the expansion valve, so don't go replacing expansion valves all the time, but on this system we do have an expansion valve problem sort of a known issue. If you look back on some of our old videos, but you can see what we got out of the system is three pounds: eight ounces, which is less than the desired factor factory charge, which is over five pounds. So that's something else.

We need to look at as well is: do we have leaks in the system so once we do the nitrogen pressure test we'll check for that, but today what I mostly wanted to show you was an RDD. We did. The entire recovery in under five minutes makes it really easy nice and light great heavy-duty handle on it. It has a double row coil, which makes vapor recovery.

A breeze is everything you could want really in a recovery machine, as well as a DC motor which responds well to a low voltage. Voltage drop those sorts of things in comparison to a typical PSC motor. So there's a lot to like about the nav ack and our DD recovery machine thanks for watching.