 All right, so we got a rooftop unit here that we did the PM on recently and while I was here it was low on refrigerant so Came back today to do a leak search to find out where it's leaking at. I was down about 13 pounds So it's a pretty good size leak. Basically. I kind of did an ultrasonic. I Heard a bunch of noise, but that ended up being the refrigerant equalizing So started just scanning around and then eventually I ended up seeing this oil here on the piping So the oil is pretty much from top to bottom Definitely something right here on that black mark that I put I wanted to scan all the other areas to see If it was you know because the fan will catch it and it'll pull it all over the place And then I always kind of scan on the backside of the coil here because it has a tendency to Vibration and stuff it seems they tend to leak in that area a lot of times from what I can see it looks to me like Basically, the oil has just gotten thrown all over the place from the fan motor Look at that little burger It's right in the very back there That is a tiny flipping leak Spray it again see if you can get it. I hopefully I'm getting this in the viewfinder I'm gonna go ahead and soak down these other ones here and we'll scan around some more But you can see it found a tiny leak. I mean that thing is small. It's barely Barely showing up at all We're gonna go ahead and scan around a little more Like I said, this is a fairly decent size unit 17 tons 17 and a half I should say colds a little bit of refrigerant. This is a three stage unit Yeah, we hold 35 pounds. It's gonna take a little bit of time to recover this thing. It's got a VFD on it It's got two TXVs This is a VAV system, so and it's got a controller all on it and then basically So it's kind of a difficult situation when you want to run it because you got to get all the systems open But what I ended up doing on this one here was actually opening up the fan section here and Let the air just blow out because they have safety switches on it So if the static pressure gets too high it shuts system down Otherwise you blow the ductwork part. Basically, we're gonna recover this with the three eighths hoses. See how fast we can get this done We're gonna use today As some of the valve core depressor tools Basically what it does is it pushes down on the center there It's supposed to give me a little better flow on these high flow valves You're gonna see what kind of difference it makes we're gonna do a three eighths hose off of the Discharge line which technically is gonna pull it right off the condenser hoping to get Pure liquid like that. So it's got that purged out since this is an empty cylinder We're gonna go ahead and dump as much as we can get out of there because I seen it was just running right directly into the tank and It's already making a difference is 410a unfortunately, so I do got my water hose up here on the roof To help cool my tank down. They don't have any ice and I don't feel like running a lot of hose Believe it or not. I actually use my little Milwaukee fan there And it helped quite a bit the joys of picking a refrigerant that runs high pressure So we got 15 pounds. So we're halfway there. I got to cool it down. That's a subco tool Normally if you can get the hose up there You can just put that on the tank and it'll it'll keep her cool enough You won't have no issues. We are doing it through the vapor port just because it's got wide open Valving straight on down through where you got a dip tube on the liquid. So it's a little more restrictive another trick. I've tried Cramming more air through the machine And it actually doesn't do too bad of a job. I've tried it both ways Like I said, I'm pulling straight off of the circuit there. I'm just monitoring it with the gauges Just to see where I'm at. We're maintaining about 425 area So she's tripping about five five and a quarter. So this actually is working better Then pulling the tank. If I had two of these fans, it'd probably be better But thought I'd throw a little hen out there. Today's about 80 80 82 degrees something like that. So we're right at 30 pounds So we might be a pound or two off from the leaking let this go a little bit longer We'll get her done and we'll just reheat that and then recharge it. We're gonna probably pump this right back into the System right from the recovery tank through the recovery machine That's one of the fastest transfer methods that I found when you're dealing with bigger equipment There's certain tricks and things that you end up learning when you start getting into bigger things that You wouldn't normally do with tiny little five ton units and stuff like that, which this one's not real big It's only 17 and a half like I was saying, but when you get into several hundred ton units and things like that you've got to speed things up a little bit and Especially when it's super cold out when you're doing it in the middle of winter What we're gonna do on this is we'll take it down to where it's just a positive pressure We'll braze that and then we'll Just basically recharge it. We're not gonna pull it into a negative or anything like that we should be able to make the repair and We should be good to go that way We don't have to change filter dryer and all that like I said, it was 30% 40% down so we weren't pulling in a negative. We didn't suck any moisture in Anything like that to where you know, we really need to justify it This could be considered half by some if you're a stickler on by the book but one of the things you'll learn is There's always corners that you can roll around As long as we keep her in the positive and we just got a slight positive there, we'll be fine We'll be able to braze it won't have no issues Okay, we're gonna warm this up a little bit burn all that oil off Get all that oil cuz I don't want to those contaminants in there We're gonna do both of these joints right here just because they're both so close to one another just like factory Let it cool for a moment Come in here on this one Try and pull that heat into the larger pipe that way it sucks into it Kind of hard to get to it, but we will There we go Get that let it cool for a moment Then I'm gonna pull that little goober there. I got right here. It makes you look bad There you go Yeah, we all make a few mistakes here and there Except for the super tax that tell me I suck But you know, it's okay And since I disturbed that I'm going to go ahead and get this over here Just as precautionary Bring it in Just to make sure Let it cool And it's come down to this one here burn off any oil a little bit on it just to help her out There we go bring it around There we go There we go. So Both of those have been redone So if there should not be any leaking on there if there is then I screwed up, but right now We've got it there. We've got about two pounds three pounds of pressure in it. It's basically evaporating out We recovered everything. So basically what we're at right now is the minimus release If you used to look through the hose or the trees over there see that that's just a little bit of vapor right there There's no oxygen getting in there and that's very very miniscule so I have done this multiple times over the years and If you like it great if you don't like it it works for me But You know like I've said a million times I'm doing this to help some people out. Is it the hundred percent correct way? Now you should pull it out change a filter dryer pull a vacuum and Spend another three to four hours and for as concerned as everyone is on here about how we supposedly do things too correctly To the point where it costs the customer money. I wouldn't think that they'd have anything to complain about so like I said This has been repaired. It should not leak now all this oil crap down here It's all from that little leak up there of these fans Basically pull it and just fling it everywhere. I should got everything out of the machine We'll do that up here on the fitting That's good to go Zero this out and weigh in 35 pounds since you're sucking here Since you're sucking pure liquid in you got to kind of throttle it a little bit into the machine Otherwise you're going to overwhelm it. I'd never done this prior to being here where we got you know Like I said bigger things to work on there's a Fish when you're dealing with the expensive r22 and you're talking 200 300 pounds of refrigerant and as long as your tanks clean and your machines clean There's nothing wrong with doing it this way So as you can see we've already got nine pounds already in there And as long as it's taking us to talk if this was just a little split system, obviously it now would be charged It just would not be worth it. That's pretty confident in my braze joint, but let's go ahead and do a spray here of it. I Do not see anything at all there And as you can see it looks Not too bad better to there No burgers no funky monkeys. Let me detector warm up We'll scan it with that while we're doing our thing. We're already at 19 pounds So we're able to get this thing back up really quick. We're pumping it all into the condenser So no problems of liquids wagon back to the compressor or anything like that I kind of explain what I'm doing and I'm kind of wondering are you guys like it when they just watch what they do and don't Really explain it. I'm kind of curious of that because their channels have grown quicker than mine so I Just tend to explain why and what I'm doing So what do you guys think leave a comment down below? All right good. We were about five pounds low yet That's it So she's charged spec Yeah, we were here on the first so it's been 30 days Since we've been here They've lost five pounds in 30 days Notice our pressures are nice and smooth. Nothing's going up and down like we've got non-condensibles or something stupid in it So put that on the shelf Well, we know we got it weighed in our pressures are not abnormal We're pretty normal there so Can't beat the factory weigh-in method run a 55 degree evaporator which like I said This is a variable air volume system. So we may have zones calling not calling Motor to be ramped up ramped down all kinds of crap going on. It's hard to say exactly what's going on So I just want to make sure we weren't going skyrocketing head pressure or dipping low into the suction pressure Which neither one of those are happening. So that's going to wrap this one up I've still got to go check out the other unit yet All right, so like I said, this is a VAV system. So I can't force it to run at full capacity without bringing some outside air in and also, and this is all controlled by a Building automation system But this thing's 25 tons So we're blowing a lot of the air out here. I mean it's Otherwise we would have blown the dockwork all the heck So This chart system here is quite amazing. They want to know what your discharge temperature is Which we got 105 So you go 105 5 10 15 20 so top line here go over and they look at your Discharge which is 338 338 somewhere about there. Let's just say 350 and if we was to hit the 105 or above it says add if above the charge I don't know why they wouldn't just use sub cooling why they think that you're not smart enough to do that I'm not sure But I would think they got you working on this that you know how to do it I just me this the lazy man's way of doing it, but Whatever so in reality, yeah, it's a little bit low sub cooling though comes out to being 14 degrees. I Haven't even put my suction probe on there yet but I'm gonna let it run for a little bit 410s 410 and it all takes forever so You can see there's oil What exactly There's case scenario we get a charge correctly and if it starts to rain which it looks like it might Then we'll have to come back and finish it up. This one here holds 43 pounds So we still aren't quite to our target yet at this point we're just gonna look for a leak and right down here on that solder joint Every time and surprisingly There's not leaking any on the on the seal here Nothing here at all Microscopic micro bubbles There they are Go ahead and dial that down again Yep, there she is Plain as day We'll need to come back We're gonna order a new roto lock for that and then new seals for both of them and That way we can chop it out and just put a new one in there We'll pull the refrigerant out and we'll weigh in the factory charge That's gonna be the best thing and I scanned the rest of the system over did not find any other leaks anywhere Check the evaporator really good scanned all up inside of the Distributor tubes here and everything was good to go on that If you guys like the video and you want to see more like it by all means give it a thumbs up Don't forget to like share and subscribe and we will catch you guys on the next one