This is really interesting. Look at this oil. We didn't do anything to introduce that much moisture into the system, i'm wondering if their oils contaminated in their brand new compressor. I don't understand we're going to keep trying to do oil changes on this, but there's no reason for this because we purged with nitrogen.

We had nitrogen flowing um yeah unless the nitrogen is contaminated. I've never seen that before. That's interesting, well we're gon na keep doing oil changes got a couple other little guys here, so just keep doing them and hope that oil clears up. This video is brought to you by sportlin quality, integrity and tradition.

Today's a little bit different the complaint actually today is that the restroom is hot okay, and so we came up onto the roof, and i made some assumptions and i was incorrect on my assumptions. Okay, so um, i assumed that the restroom was controlled by the kitchen ac, which is right here, but the kitchen ac was working. Okay, we went to the restroom exhaust, which is in that corner right over there. Restroom exhaust is working, so our next step was to go climb into the restroom and trace out the ductwork.

It was a little difficult to do so, but it looked like it could have been coming from the kitchen ac all right, but i also kind of wondered if it was coming from that ac, because the restroom mind you is over here. Well, we did a little bit more investigating. I had another technician here with me and i had him go into the restroom, because there was air blowing out had him put his hands on the vents and i shut off this ac and the air kept moving and i shut off this ac and the air Kept moving, so i'm like what the heck and then i'm thinking well, what other ac could it be, and i can't see it being this one, so we went over to this one, which is their bar, ac and uh. Sure enough.

The restroom is being teed off from this unit right here and running all the way across the building. So we know that our problems with this ac now they're not complaining about their bar area being hot. So i'm a little intrigued um. Now that we've figured out this is the unit we come up to it and i want to check the belt so we're going to open this guy up.

I have it shut off at the disconnect switch. So we're good on that and we come over here to the belt and it's a little loose. It's not horrible, but it's definitely loose and i went through the prodigy board, which is right here and it has all these free, stat errors. I'm kidding not getting you.

Maybe like 20 of them over the last two months, freeze that freeze debt free stuff, freeze that so i cleared all the free stat errors and we're going to dive into this guy. So we very well might have a refrigeration problem that we're going to have to check we're going to tighten up that belt and then we're going to probe up on first and second stage and then see what the pressures look like and how the unit's operating. Okay. My first stage doesn't look horrible.

I mean head pressure's a little bit low, um superheat's a little bit high sub coin's about where it should be. This also has no load whatsoever. It's 62 degree return air temperature right now, um temp, splits, low and that's interesting. I jumped over to the second stage and look at the super heat extremely low superheat, so it's flooding back sub cooling is lower than the other one.

I'd expect it to be a little bit higher um yeah, that's interesting! What is going on with the other valve versus this valve? Do we have some problems here? Huh. We still don't have a great temperature split either it's very interesting yeah. So if we come in here, we've got both of our sensing bulbs. Here's one txv right here and then the other txv is down here sensing bolt back down here, none of them are loose and where they should be um.

I close the outside air damper interesting, we're doing a temperature check across the dryer, so it was 87 degrees on this side of the dryer and it's 86 degrees on the other side of the dryer. That's for one stage all right! That's one dryer right there! That's the second dryer, so we're 93 degrees on both sides of that dryer, so the dryer's not plugged up. We definitely have a significant liquid temperature difference across the two, so one of them is an 83 degree liquid line. One of them is a 93 degree.

Liquid line, so we got something going on here: it's interesting about the txvs, but i kind of feel like we need to recover the charge and start from there. This is a 410 with a micro channel. I think our best bet is to recover the charge and weigh in factory charge and see where it goes from there. The txvs are not adjustable.

I don't really see any problems with the txvs. I mean not a whole lot that can go wrong with them. Besides a power head failure or something so we're going to start by recovering the charge and seeing where that gets us, i wanted to test something so um. With both compressors running i had y2ny1 calling my vfd was running at 58, hertz or 53 hertz.

I pulled off second stage and it slowed down to 38. So i wanted to make sure that we were speeding up to proper settings and we were so. I just clicked it back on and we should speed up if it grabbed it. It's a little loose yeah.

It's something so we should speed up there we go. We went up to 53 hertz, so that's a two-speed blower, so it slows down and speeds up with first and second stage, so we're good on that all right. That code just happened right now. All right, we're gon na go, get the recovery equipment, we're gon na pull the charge and weigh it back in.

It's always important to understand. This has never been used before and it wasn't in a vacuum. We're gon na be reusing the gas that i'm putting into it. So we got to pull a good evacuation on it to make sure that you know we have a clean vessel for the new refrigerant to go into so we're pulling the evacuation.

We got the recovery machine, ready, we're going to just be pulling through gauges, because i don't have all my fancy fittings and everything which will be fine, so we're just about ready. I suspect that the second stage is going to be fine. I suspect the first stage is going to be low in refrigerant, but um we're just going to pull them both because it's not going to take long at all. So all right, i got everything purged all the way to my tank.

I opened up my tank. We're pushing in what we can before we turn on the machine, so it's gotten about almost a pound. At this point we go and hit the machine soft startup good to go. Let it run we're weighing everything as it's coming out.

Second stage is almost done recovering. We've just about recovered six pounds of gas and we're just about out so it looks like second stage, might be about a pound shy on its charge, but um that wouldn't really add up to why we were flooding back on this one, but still we'll make sure We top it off. Accordingly, we still got a little bit more to go so i'm gon na. Let it keep running all right.

We are like. I said it is dragon it's at 2 psi, but at the same time i fully understand that i'm pulling through schraders. I'm using normal hoses, i am not making this a fast process at all, and i'm not upset about that. I just have to know your limitations.

Okay, it's going to take longer, but i still have a larger diameter output hose and a larger diameter hose going to the tank. Also, at the same time, we are leak, checking the first stage so that way, we're not wasting time, because the first stage still has gas in it. And we were picking up a couple little traces down in here, but it hasn't been able to pinpoint anything. As of yet all right now, both stages were low on gas, the first stage more so than the second stage, but both of them were low.

We already did a quick leak check. You know - and we didn't see anything but this time we're going to investigate the evaporator a little bit more. I've seen a lot of these linux units leak right in the middle of the evaporator coil um. It may be a very small leak.

We may not be able to find it. Who knows so we're just going to do you know the best we can we're not going to fill the system up with nitrogen. It wasn't that short. So this is the first stage.

Uh we've got a 17 degree. Temp split, that's just about what we're actually aiming for, or the target's 18 degrees right now this is the first stage. The super heat is throttling, as the valve's kind of adjusting the system still stabilizing out. Sub coiling is about 20 degrees.

Pressures are looking a lot better on the first stage. Now that we've added a little refrigerant, we cannot find a leak on this guy, but again i didn't pressurize with nitrogen. We just did a quick leak search. Nothing so at this point we're going to go ahead and jump over to the second stage and see what that one's.

Looking like this is the second stage um, it's not looking too scary, i don't like that low superheat, but the system's still kind of pulling down. So that expansion valve is going to be moving back and forth um we're gon na do one last uh looks like we lost our supply air temperature sensor right now, but we're gon na do one last uh temperature check across the dryers make sure there's nothing funky Going on there, but other than that, i'm just gon na tell them to keep an eye on it. Well, today, we have a compressor swap on this guy um, this guy right here we diagnosed it as being bad, so we got to kind of figure out the best way to do this, as you can see that compressor is really kind of tucked in there, and It's going to be an awkward um removal, but we'll see what we can get to. We also got to change the liquid line.

Filter dryer, but we're going to start. We went ahead and brought the entire contents of our van onto the roof. We're going to get recovery and then start swapping out the compressor. Try to make everything easy so we're getting the recovery machine started right now.

We just started it up all right field, piece: mr45, we're using large diameter hoses, so we are using gauges. We did remove the schrader on this one. We cannot remove the schrader on this one because it's too tight in there so we're doing our best more than likely we're going to watch the the discharge pressure of this guy as it climbs. I suspect we're gon na have to get a bucket of ice because of uh the high temperatures - it's probably about 80 degrees outside right now, and this is 410a, that's expected.

So with that being said, we weighed the cylinder because it does have a little bit of refrigerant in it. We weighed it before, even though we've got a scale on here right now. If we end up having to put ice on there, we're going to have to pull the cylinder off, but because we weighed it before we'll still be able to keep track of how much gas is in it. So yeah.

While we're waiting for that to recover we'll uh start sanding everything up and getting ready for the swap, if you pay attention to things when you're recovering, you know, look at how much gas the system takes, it takes seven pounds. Four ounces. We recovered six pounds. Twelve ounces, so that's not bad! I mean you know it's a little bit off, but it's not bad.

So i'm not really going to be too concerned about a giant leak on this system. Now, if we only recovered two pounds or something like that, then yeah i'd be more concerned, but um. No, i'm pretty confident that you know we're we're doing. Okay um.

We noticed, though, that when we pulled this guy off that the the cap had pressure, so that's a potential leak source for sure, okay, so we're going to start disassembling everything pulling out the compressor we're going to try to make this as easy as possible. This discharge line right here is in our way, and it's going to make it hard to get that compressor out. But if you just cut it right here, you pull the whole discharge line assembly out of the way, and then we put a coupling right here so got ta. Think smart here make it easy, usually not always, but usually, if you're struggling and something is really difficult.

You're usually doing something wrong or you need to stop and think about it for a minute, because there's usually an easy way. Now i realize that sometimes some people set some things up crazy, but usually you can look at and be like. Oh there's an easier way to do it. Okay, we got the nitrogen flowing through here.

We went ahead and cut this guy and now we're going to unsweat the suction line and then take the discharge line out now to unswept the suction line. We're going to very carefully use the discharge line as our leverage point and we're just going to push with the linemen pliers boom pop it out, and then once we do, that we'll pull the discharge line out and then we'll get swapping it out now these compressor Plugs a lot of people get really frustrated with them. You typically don't have to oil them or anything like that. It requires one side going in then forward or upward pressure and spin it and it'll pop up into it.

It takes a minute to get used to them, but it will once you get it, you realize you know it's a lot easier see you're pulling down. I can tell so you want to push up the entire time you're. Turning there, you go, you got it. Okay, so there's no need to oil them again, most of the time you don't need to so and then once you figure it out, it becomes a lot easier.

Just the upward pressure, the entire time there you go, got it perfect. These guys right here are going to go down into there, just like that. Just like that. Actually, i think that might go from the other end, look and see how the other compressor was.

Almost there no joke they can get the best of the best technicians in the world. Sometimes it's the easiest thing. So let me see it's just a matter of. Let's see if i can do this.

With my left hand, there you go. Okay, put those in put that in that back corner and we're ready to lift this guy into there. When lifting these compressors use your screwdriver as leverage on the lifting point right, there makes it a little bit easier, just carefully, rotate it in and sometimes when you're putting these in. You can rip the plugs out because you push it too hard and it pulls it right out.

So you want to lift the compressor as much as possible into place. We pulled the top plug and pressure shot out, which is what you want. You want it to be pressurized, they come with a holding charge. Typically, and if you do everything right, we already sanded everything that should just pop right in there just give it a whack there you go move the compressor around.

We might have to heat it up, but sometimes you get it to slide in. So when you're putting the uh the viper wet rag compound on here, you want to be very careful to make sure that it doesn't get anywhere near your braze joint. So we pushed it on this one up here, but we made sure that it was nowhere near the ridge of where the copper is because we want to protect it as much as possible. And you don't want it to contaminate the the places and where it usually happens, is on the bottom, where you can't see it as much.

But this one looks good, we're probably going to put a little bit more just to kind of dissipate the heat and make it you know, go a little bit smoother and then we're going to go ahead and get the dryer ready and pack it around. The dryer, too, we already cut the dryer out on one side right here we cut one side and then we unsweat the other side. We're gon na get a new dryer put on this guy, the viper wet rag by refrigeration technologies love this stuff. It doesn't dye your hands, blue or anything.

The dye doesn't come out of it. The only thing to understand about this stuff is this: just displaces the heat so there's there's moisture in the putty and that absorbs the heat while you're doing what you need to do. But there's going to come a point when it can't absorb any more heat, then it's going to transfer the heat. So the key is to get this stuff braised and get that wet rag compound off as fast as possible.

So that way, you're not compromising any components or - and you can tell too i mean it's - it's inevitable - that it's going to get hot, but when you have to like scrape this stuff off after you're done like when it gets stuck to it. That's because it's doing its job, it's getting hot um and you can reuse it you, you pull it off. You put it back in here, just put a little moisture in there pack, it up and it'll you know be, you know, have its consistency back and everything. So so we got everything prepped we got the dryer installed.

We went in with the sporelin all 16 3. So it's a 16 cubic inch, 3 8 line size. We went oversized on the dryer and then we've got everything packed with the viper wet rag all around it. We've kind of got a game plan.

We have a towel protecting some wires in the back, so we're gon na get started on this guy, so we're starting with what we think to be the hardest. Braze joint, which is the one where we're gon na, have to work upside down, but we're doing the top first. So that way, the heat energy heats up the bottom. We don't have to worry about it all right.

Everything is sweat in you know, it's not perfect. We have little spots where we have burn marks and stuff. It's okay, it's not at the end of the world. All right! One thing i will say is they don't do a very good job of securing stuff in these units? There's really no strapping.

Maybe we can strap it to the other lines, but we went ahead and went with an oversized spoiling catch-all with a 16 cubic inch. They had an 8 cubic inch in there. I like going oversized on the dryers, we're done. Brazing compressor, sweat in we put the coupling up here, we're just hooking up the electrical we're doing a tightness test with the gauges right now we're looking good so far, so uh we'll do evacuation running here in a few minutes, so the restaurant is open and we Were doing a pressure test, but we wanted to go, take a lunch while that was happening, so we went ahead and put all the panels back on and started the unit up.

Um it passed the pressure test uh we lost like .4 psi or something i'm not too concerned about it. So yeah we're looking good everything's in we're just going to uh get ready to pull our evacuation. We can do that with the door and stuff where it is um yeah. So that's it we're just going to start the evacuation start.

Cleaning up all of our messes well moisture came from somewhere because look at that oil, that's white! We're going to do oil change on this guy, so it's on the fly oil change, which i really dig about. The field piece pump just drain it there pour it in all while doing the evacuation you're good to go, make sure we don't overfill, there's something going on in there we'll give it some times. We might have to do another oil change again. This is really interesting.

Look at this oil. We didn't do anything to introduce that much moisture into the system, i'm wondering if their oils contaminated in their brand new compressor. I don't understand we're going to keep trying to do oil changes on this, but there's no reason for this because we purged with nitrogen. We had nitrogen flowing um yeah unless the nitrogen's contaminated.

I've never seen that before that's interesting. Oh we're gon na keep doing oil changes got a couple other little guys here, so just keep doing them and hope that oil clears up it's kind of crazy um, but the evacuation is doing good. We have we're just doing a one hose pull. We have the micron gauge on the liquid line port and it's down to in the 900s now so it's doing good and it's every oil change is getting better.

It's kind of clearing up, but good gosh. Look at how nasty that oil is the more i think about it. You know we could have contamination um from the this unit's only two years old or no it's it's like just over a year. I think old and uh.

It could be contaminated from the factory that or this oil is contaminated in here we could just be cleaning the system up, because the old compressor was locked up. If they don't ask for the compressor back, then i'll cut it open, but it is under warranty. We were trying to count how many oil changes we've done. It's been a lot it's somewhere between six and eight is our thought um, but some of these are full of oil too.

So yeah, it's a mess but um we're currently at 491 microns. So we're doing good we're about ready to do a decay test and see where it lands million oil changes later we are currently at 461 microns right now. I don't know how well that comes across 461 and uh. I mean it's doing.

Okay, the oil is finally staying clear, but i mean every one of those containers is full of that nasty oil. Like i said earlier, i don't know where this contamination came from. I don't know if that's what caused the original compressor to fail? That's a good possibility or if the new compressor the oil was contaminated from the factory. I would think that i mean.

Is it possible that from the old compressor there's that much moisture in the piping? I guess it's possible. It's interesting, though, it's kind of bizarre well we're gon na start a decay test see how fast it rises. We'll give it a few minutes. It's looking pretty darn good.

I mean it's still in decay right now, but i'm going to call it at this. It's not going to get much better than this guy. You can see that it's clearly just moisture and it you know, because if it was a leak, it would be almost a straight rise and we're slowly rising. But it's looking good, so measure quick is already actually uh.

The blue vac app has given me the all clear saying that we passed it so um we're gon na go ahead and get ready to charge this guy. Now all right, i've got this drum and it might only have a pound or two in it. It's it's bare, almost empty, but we're gon na try to get as much of that into the system. While the system is uh in a vacuum that way it'll suck.

In most of it so uh, let's turn this guy on this guy's on this guy's on uh, i purged, as i was putting them on. That's how i was able to add these, so we're gon na go ahead and open that open that and we'll go ahead and charge as much as we can into the system. It's just vapor, so i'm going to put it on the low side too, get it to take as much as possible turn this guy off and then once it's done taking out we'll get a full drum. We have a brand new drum right here, and this is 410a all right.

It took just under five pounds. Our total charge is seven, so we need to turn it on and meter the rest into the low side. We're going to come over here to the menu we're going to go to service test cool both stages, go ahead and shut that door and we're gon na add gas until we get to seven pounds. Four ounces is what that guy says so compressors running.

I have a feeling i don't know if the customer is going to approve it or not, but it would be really smart if we come over and change this dryer in a couple weeks and change all the refrigerant again, that would be a smart move with whatever Contamination is in here, but i don't know if they'll approve it or not. Okay, we are running it's looking good. It's uh, it's hard to see right now. There you go got a 44 degree, evaporator coil right now, head pressure, condensing temp is about 113 degrees.

It's just about 100 degrees outside, so maybe just a little under 95, or something like that. Oh yeah. We got to pull the micron gauge off forgot about that. Luckily, this micro gauge can handle positive pressure, but definitely need to be careful about doing that.

Um and here's the cap for that guy there you go put that on there and uh yeah we're gon na wrap this one up, but 39 degree evaporative coil. But that's because we just opened the door 110 degree. Condensing temp seems fine to me. Customers gon na be happy having a second stage on this unit and uh.

I i hope that that compressor, they don't want it back, because i want to cut it open and find out if it has a copper plating in it all right the manufacturer's giving me the okay to go ahead and throw this compressor away, meaning they didn't want It back for warranty inspection, so i'm gon na go ahead and cut it open myself and see why it failed. So we had sealed this the day that we changed it. So we really shouldn't have very much outside moisture contamination um. So this thing has plenty of oil in it filling up a bucket right.

Now we just lobbed off the ends that i had braced shut, so we're just letting it drain into here. It'll take a couple ups and downs, all right. I've never cut an lg compressor open, so they're a little bit different than what i'm used to. I cut copelans open majority of the time, some tecumseh's, but not a tecumseh scroll.

This one has a three point on the bottom for the bottom. What do you want to call it bearing race or whatever bearing bracket? So far? I don't see a lot of copper plating going on in here, but i do already see an issue so down in the bottom. There's something metallic down here, don't know what that's for. It's magnetic too interesting right and then right up in here.

Um i've already see something broken up in here. There's a broken piece that i did not cut. This thing definitely had some overheat going on. Look at the purple tarnish they have going in there.

Look at that um on another note too. The welds on this compressor were not that good, not all of them, but majority of them. I was able to just break off with a small screwdriver. They didn't get very good penetration.

This one i had to cut off or grind off, but this one and this one on these two sides right here: they literally just popped off by putting a screwdriver and pop. They were almost like tack, welds, um stator looks fine. Besides my marks, i don't see any issues there we'll get in here to the overload later and look at that, but i don't see any issues in there. I told you i'd win.

It's really interesting because this top part of the scroll assembly is held in by pressure. So i had to carefully cut down the side right here and it popped on me. And if you look in here, there's a lip there's a little lip and you can see where it's held on by pressure. That's really interesting, all right! So now you can kind of see what's in here and we have to look at the damage that i did too, because i did damage in here trying to cut this thing because i didn't know where it was.

So that's me, but we got to go through this and try to find what was broken. What you know interesting, oh you know what no oh, this might have been me. No, i don't know this could have been me this piece being broken right here. I don't know i'm gon na keep investigating we'll see all right so further investigation.

I did not cut this okay, it's not it's not clean um. This was broken. This is stuck down in it because um that that must have been broken inside the compressor number. One.

Look at this is interesting too. There is right in here there's just like this gap right here right and then look at the top of this, where the top of the um shaft sticks in here, there's like crap down in there. This is just junk looks like maybe some flooded start situations right here, um, but look at the inside of that look at how look at the coloring on that. This is definitely, i believe, yeah and look at the copper plating going on in there.

So um that moisture, i believe, was in this compressor uh we had severe overheat situations, look at the tarnish right there um. I think that the new compressor. I don't think that the the moisture from the evacuation had anything to do with that. On another note, too, you know this is really interesting, because, even though this is a scroll compressor, there was like again forgive my ignorance here, but there was like reeds on that kind of like in a piston driven compressor.

That has a reed. I mean you had a double setup here. It's really interesting. How lg does this? Like? I don't know it's really interesting, but yeah.

I'm gon na say that the moisture problem in the evacuation that i saw it was in this compressor and i believe i was just pulling the remaining moisture from the system. Look at the the rifling or whatever you want to say inside there too. Forgive me, i don't know all the technical terms for all these parts in this guide, but i'm going to say that this was caused by the customers lack of preventative maintenance. They run with broken belts quite often um, this particular customer.

We have a lot of issues there and uh. I do have to say, though, that i'm not a super fan. This is interesting. The whole inside of this thing is very interesting.

How that's not perfect curve. I'm sure there's reasons for all of this, but yeah. If anybody has any information on lg, compressors, cutaways breakdowns or anything like that, or contacts at lg, i'd love for them to talk to me and help me to analyze what is going on here, but yeah. This is almost like an old ham.

Coupling like on this copeland, scroll compressors, i believe, and that i believe was broken inside there and that's what caused the locked up situation, but look in here too. Look at all this. I don't think. That's from my that's a lot of contamination.

I don't think that's from me cutting with the grinder. I don't think so. I don't think it made it all the way into there. That's really interesting, though i mean i guess it's possible, but yeah.

This guy's done all right, cool, well um, my uh, my curiosity's been uh satisfied here. I just kind of wanted to want to see what was going on in there all right that one started off as just a service call on their restrooms being hot right, and then i really didn't have a lot of footage didn't find a whole lot wrong, except For it was a little bit low on refrigerant and i couldn't find a leak, but to be fair, i didn't hit the system with nitrogen. Okay, as you guys saw in the video, though, what i ended up finding was that there was a leaking schrader. That's the only place i could find a refrigerant leak and when all was said and done in the very end, when i changed the compressor, i did a pressure test and an evacuation and no other leaks were present.

So the second time i went out there when i had pulled my uh, went to go put my gauges on the cap blew off at me, meaning that there was refrigerant leaking out of the schrader, so i did replace the schraders. I didn't address that in the video, but i did okay, so um. It's always important too, and i've said this before and i mean you know. Sometimes i forget to do it too, but in all fairness i didn't suspect a leak in the very beginning.

Okay, but if you ever suspect a leak on a system right and you're, confident, there's an actual leak, it's best not to apply service gauges to the system and to do a quick leak search. Okay, of course, you don't want to waste your time if the system's completely out of refrigerant, but it's kind of a cool thing at least check the schrader caps and the schraders before you apply gauges. You know just to make sure, because, in my situation my leak was on a schrader valve and when i applied my service gauges, i concealed the leak. Therefore, i couldn't find it when i was doing my initial leak check now.

I do want to address something that on the micro channel, condensers um, they can be very difficult to check proper charge and sometimes especially in my situation, i had a very low ambi. I mean very low um space temperature down in the occupied space, so we had really really low return. Air temperature essentially no load on the system, so it was kind of concealing the refrigerant related issues. My pressures didn't look horrible, they weren't where they should be, but they weren't like screaming at me.

Hey this thing's two pounds low on refrigerant. You know, but um it certainly. I believe those pressures would have been. I mean the the symptoms of the low charge would have been amplified if we had a higher indoor, um, uh temperature and or load coming back up the return airstream into the ac.

I think that it would have been amplified and we would have seen it a little bit more a little bit easier, basically, okay, so in that situation on these micro channel condensers um, it was just easier, in my opinion, if you suspect anything, just go ahead and Recover the charge pull the charge, weigh it back in that's the best way um. You know when it's just not completely obvious okay, so i went ahead and uh found that the unit was a little low and refrigerant added the refrigerant. The csm seemed to be operating somewhat decent, okay yeah it was. The superheat was a little bit low and stuff, but remember we had no load in the building.

So that's pretty expected. Okay um. In the very beginning, though, there was a clip where, when i first walked up, i found that the system had um had a lot of freeze, stat errors, okay, meaning that the evaporator coil was getting too cold and there's a little thermostat clicks on thermostat. That said, hey it's getting too cold and it sent an error message to the board and typically it shuts the unit down.

I told you that there was like 20 of them. I i may have been exaggerating, but there was a lot. There was a lot of error codes for freestat in there okay and we had a loose belt. Okay, this is a symptom of uh improper maintenance of the equipment.

The customer wasn't doing enough. Preventative maintenances, okay, now there's reasons behind that with all the craziness of everything and budgets and everything: okay, so that's a whole nother thing, but bottom line. My personal opinion of this complete analysis compressor analysis and everything is that this was caused by improper preventative maintenance. The lack thereof of preventative maintenance leading to uh flooded, starts and flood back.

In my opinion, okay, now um uh. I have a couple notes right here that i wanted to talk about. The temperature checks across the dryer was an important one. So, while we're going through our analysis to make sure that we're not um restricted out of dryer okay, so when i was suspecting like hey, why is the superheat so low? But then i realized hey.

It was the load, the low load, but still the superheat was weird. The liquid line temperature was weird the difference between the two compressors, but i just before i recovered the charge, wanted to verify that there was no issues with the liquid line. Filter dryers okay, so we went ahead and did that some of the other things that i checked was the vfd. Okay, again, i'm trying to figure out if there's something going on with the system, because at that point in the video i didn't know that it was low on charge.

Yet so i'm like okay, we had a lot of freeze stats. Things are a little bit wonky, but i wanted to check to see if the vfd was working properly. This system has a two speed. Variable frequency drive okay, so it fl changes between two speeds.

Whenever first stage calls it runs on low speed, whenever second stage calls, if second stage calls first stage, is running on this particular setup. Okay, so whenever you get a y2 call, both compressors run, it speeds up to whatever the max setting is on the vfd. They do this to save energy. Okay.

For the longest time when we didn't have two speed blowers on our equipment, we were actually wasting energy and not only wasting electricity running the blower on high, but then we weren't getting the full efficiency of the heat transfer and the um. You know the proper heat transfer because on a first stage call for cool on one of these older package units that didn't have two-speed blowers. You would be running your blower at the proper uh cfm's or air speed or air flow whatever for both compressors. Okay, so you'd be moving the air too fast, with just one compressor.

So that's something that newer efficiency equipment is going to do. It's going to have two speed fans: they're bumping, that into refrigeration too, to try to squeeze as much efficiency out of this equipment. Okay, um. I already talked about recovering the gas that was super important on this thing: okay and um, the broken scroll.

You know down to the autopsy of the compressor right um that i believe was caused by flooded starts. I believe that i believe it's an old ham coupling, or at least that's what copeland calls it on theirs um. I believe that broke and because before i cut the scroll, the top of the compressor apart, i had cut just the bottom open and i cut the bottom off the compressor and i could not get the the the motor to rotate or the shaft to rotate inside The compressor, so it was clearly stuck before i cut the top of it open. Okay.

So that's why, after i was analyzing everything i was like wait, i didn't cut that piece apart. That piece was broken. I believe that happened from flooded starts from um. You know improper maintenance on the equipment clearly had some overheat issues now down to the really confusing part where, in the heck did that moisture come from okay, that one is still a mystery to me.

I saw some copper plating in the compressor, but the more i think about it. I just don't know. Okay, i don't know. If i had contaminated nitrogen, you would think if i had contaminated nitrogen, which i've never had, but i've always been curious about.

If i had contaminated nitrogen, i've used that nitrogen several times since you think i would have ran into these problems. I never ran into another problem on that tank. Okay, it could have been in the system existing from day, one sure, okay, that that unit was like a year and a half old. I guess it could have been that, but i didn't see damage really as much copper plating as i would expect to see in that compressor.

Okay, if that moisture was in there in the first place, another thought that i had in my head was um uh. You know it could have been contamination added to the system. After the fact you know from people working on it. I guess it's.

It was a really mystery to me to figure out where, in the heck that moisture came from, i have never seen that much moisture in an evacuation. I've seen some, but never that much. That was a lot okay, and i was blown away by that. I guess i guess it's always possible that it was in the new compressor, okay um man, if it's in the new compressor - it's probably not going to last that long, but the evacuation went pretty smooth if it was in the new compressor.

I don't expect that i would have pulled the evacuation that i did and passed the decay test in the way that i did paying attention to the decay test and looking at that bar graph. It definitely didn't have a leak right, because if it had a leak in the decay test, you would have seen it go spike right up on that and - and we just saw a gradual increase and it was rather minor right, um we pulled after i did so Many oil changes and i did run the gas ballast open for a very long time too, trying to clear that crap out, but we did uh. You know pass everything. So i don't know the moisture was a mystery.

The customer has not approved us to go back and do dryer changes or refrigerant changes, or anything like that. I tried to bring it up, but you know it's just kind of they just want to see what happens so, there's a very good possibility. We may be back out there in a year or so to change another compressor. Hopefully, if, if it is still in the system, it doesn't lead to any catastrophic failures like grounded compressors burnouts.

Anything like that, but it's hard to say all right. We do our best. I try my best, i'm not the best at everything you know i just just try. I just i'm curious.

I dig into things you know so um, i'm sure there's going to be a lot of other points and topics that people make in the comments feel free to send me an email, hvacr videos, gmail.com. Let me know what you think where, in the heck did that moisture come from? Why do you think that compressor failed in the way that it did? I was thinking from the flooded starts. Is what i'm thinking um. You know, but again it's it's one of those things.

I think that's what happened, but it's hard to say so feel free to. Let me know what you think down in the comments, if you guys haven't already, if you're interested in doing so, please check out my website hvacr videos.com, it's a great way to help support the channel. We have merchandise available on there. These hats, sweaters, beanies hoodies.

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