Maybe you inherited your mother's whiny dispositions. That was a joke, because his mother's, not whiny at all, am brian with hvac school and i'm gon na show you real, quick. The vacuum pump that we use most often out in the field right now, which is the NRP 8 di from Nav ikata like about this pump. It is a digital pump, it's very quiet.

It's got nice just very nicely built, and I want to show you how we use it with the micron gauge and some of the particular applications for it. So what I've got here today is the NRP 8 di digital vacuum pump. I've got a set of true-blue hoses from a cue tools which are the largest diameter vacuum hoses that are currently in the HVAC market, really pull a quick vacuum. I've got a nav act, micron gauge attached and then we've obviously got the onboard micron gauge for the nav act pump, and so a lot of guys have asked.

Can you just use the onboard gauge for the nav act pump and there are strategies you can use to use that for your decay test? There's a there's a lot of really cool things about this pump. It actually has a shut-off solenoid. So as soon as you shut off power or if power is accidently, interrupted that solenoid shuts off instantaneously, so you don't use lose vacuum and you don't suck vacuum pump. Oil into the system, which is a common problem that guys have run into the heater hose, is full of vacuum pump oil.

So it helps keep your dedicated vacuum hoses clean, but then the other thing that it does is it helps you see what type of pressure drop you have across your hose rig if you're using quarter inch, hoses or you're pulling through Schrader cores or you're pulling through Your manifold you're gon na see that there's a huge difference at the system of the microns that you're seeing and what you see here at the pump and I'm gon na show you that. While there may be a little bit of difference, because no two micron gauges are gon na read exactly the same - that these two are gon na read very similar because of the large diameter of the true-blue hose. So, in order to get the full capacity out of this n RP 8 di, you want to use large diameter hoses like what we've got here with the Accu tools. True blue hoses, so here we go.

Let's get this thing started up, alright, so in order to start this, all you do, is you hit the hit the power button and then you hold it in again, so you can see right now. We have a very minimal differential, a very minimal drop across this. From 75 here at the end of the hose to 49 back at the beginning and again, there's going to be a slight difference. Micron is a very, very fine measurement, and so they could even be closer than that.

But if you were to try to pull this through a typical quarter-inch hose or through a manifold, you would see a much much larger difference in fact that I'm thinking about it, let's try it and see what we get so, I'm actually using High Flow vacuum. Rated hoses here, so these aren't even typical quarter-inch hoses and we're gon na see if we get a difference in pressure drop between what we saw with the very large diameter true-blue and what we see with these still very high quality, but lower internal capacity vacuum rated Hoses you can already see now we have a much larger difference between these two than what we had previously. So you can see. Not only is it not coming down as quickly, but there is a greater differential, the greater pressure drop across the rig and we don't have any traders in place.

This is a high rated vacuum rated hose here. If you were to do this through gauges or through Schrader's, you would have a much higher differential between what you're seeing at the pump and what you're seeing at the system, which is why it's important. Even when you have an onboard micron gauge here to have another gauge, but this onboard micron gauge is really a great indicator. It gives you something to test your other micron gauge against, and it also helps you test your vacuum pump to make sure that it's doing what it's supposed to do, i'm brian with hvac school thanks for watching.