 Today we're working on a walk-in cooler, and I got a trainee with me So he's gonna be doing the work and we're just gonna question him and let him do whatever needs to be done so the problem was the unit is Iced up So let's go in here and take a look at this we've got us a ke2 temp controller with air defrost and I have not worked for a bunch of these So I'm gonna have to get through and double check The programming now as you can see We've got a little bit of a problem here. It's a little bit iced up so We've got a melt that and it's air defrost so Only easy way to do this is with a hose So little adapter here comes in pretty handy fits in the regular sink. Yeah bad boys a little thick Which is just it's not as fast as water water has more surface contact with it. So it melts a lot faster. So, yeah, we got that there and then We're gonna have to melt some of that out of there. So just use that same spray pattern Let's get those legs out of there kind of nice of them to have that in here for us Yeah, no, there's sometimes like when I say it's an older cooler and they got a lot of gunk in it Sometimes I'll just cut the drain line and let the drain line go right into a bucket Because you'll end up plugging up in the drain line later or it won't be able to keep up. So the other issue I bring it into Yeah, eventually that panel fill up and it's gonna start going over the sides in here and stuff Probably like what it's doing right here already. Yeah pretty much Looks like it's clean to me Yeah, I guess I did Google Yep, so he said that They didn't use it a whole lot last year. It's only a year old. So Possibly it's not programmed right One of the employees left the door open all night and froze it up And then they thought it out and it never worked quite right after that. And I think this was a side job Bob Install it's definitely not something not one of ours I'm gonna check they don't look like they mounted the bulb for the TXV outside of the box so it kind of Part of the problem. I don't know if it has anything to do with this part But it definitely could cause it to not feed the refrigerant correctly But you know either way, I mean every little bit helps nice. It's got a solenoid in here While we're working on that they wanted us to check out the freezer here, which I already fixed this door seal But what was happening was this door seal was sticking and rolling the magnet and then causing a Gap which then had a bunch of frost so ended up yanking the door seal off threw it in the sink over here got it nice and warm and Was able to roll the magnet back to flat position And then put a little silicone once I dried everything off a little silicone here in the edge of corners So that basically it'll hold it there and it won't roll in place So the bulb looks like it's probably okay over there. Yeah it's probably and I would say like the nine nine to ten o'clock position, okay, and it is strapped on I mean, I would say probably half the bulb is in the box Maybe a little bit more, but then the rest of it's outside of it. Yeah Yeah, that's about what they wanted. I believe that says Thirty degrees so that would be about six o'clock or nine o'clock, so that's about right Smaller lines you can get away with it You just don't want it on the bottom of the line because where the oil sets that and it can insulate it and cause a false reading Pretty good contacts on the side and Can't tell what refrigerant it is numbers got a little bit Faded from some whatever reason Sure, all these are tight. Nothing's rubbed through tight barrier. Oh, what's there we go? Our 404 good deal Yeah It says 404 on the inside Yeah, it says helium Yeah, and then it says designated refrigerants 404 or 448. Yep What they do helium is very easy to detect leaks because the molecules are super small So they'll use a helium detector to leak check these a lot of times So they'll put helium in it and then you just want some sort of pressure in there of a dry gas Which helium is and that will displace any possibility of getting moisture in there from condensation setting in the warehouse whatever So they must have just left it in there Not the prettiest instill in the world, but I guess it works somebody did it on the side I think we're gonna go ahead and kick it on and see how our program is I was going to flip on that power switch here on the side back side. It's like a rotating swing one. There we go It might start off in defrost Let's check our programming on this thing and see what we got So I'm kind of new to this one too. So temperature set point Might as well just go up and down and see how it reads They may have a lock on it. It'll say press the hold or something. Okay Temperature set point probably the center about to tell you what it is Unitide I want to see that Yep, 35 degrees that seems fine for beer and stuff. I mean All that is units for temp display Oh fair and high for Celsius What's that? FAH? Bus address. Yeah, that's if you want to put it on a control system Nope 90 minutes. So basically if it's temperature, it's gonna wait 90 minutes before it goes off That way it gets a time in between defrost and somebody leave the door open F3 sounds about right High alarm Yeah, so if it goes up to 40 or whatever that's a little high or whatever DFT right defrost. Uh, yeah DFT defrost defrost time 20 That's pretty short I let's take that up to We go as high as 60 minutes. Um, we could try Let's just be 60 that's the industry standard with us And if we do less of them, we'll be all right Everybody's gonna be a little different depending on where they live at Community levels and stuff Could have changed it there. Yeah, so you're gonna hold him. It's all good Now I'll go back into it and see if it's stuck See it didn't stick so you gotta enter it So there you go I'm learning from your stakes now hit enter and hold it Don't quit blinking. I bet you There now go back into it. So now it's just maybe yeah, I mean it's kind of blinking at zero make sure that I don't mean nothing Now yeah, it all it is. All right, good deal Not the E would be deep frost per day. So we want to see this too We could probably get away with two being longer now Yeah And that way it's less likely though, you know, we could even do three but let's just do Let's just do two we've gotten away with that forever And yeah, remember they're not a full-time restaurant. So it's not like they're working during the day So just press and hold to see the hold Yeah, you know that good What's the next thing CSH would be mass mass compressor starts Slash hours. Yeah, it's kind of like a cycle rate. So yeah, six probably right That's about 10 Two pretty tight, but I mean The enders usually three degrees on a regular generic thermostat like an analog But I mean it can hold tighter. Let's go ahead and take it up to three That way it can go all the way up to 38 And that way gives a little bit natural air defrosting And then we're back to 10 5 Temperatures that point Okay, five. Yeah, I think I'd be fine All right, so let's go ahead and check our sight glass and we can check our super heat once the box gets down to temperature And we'll see where everything's at because it may not have gotten caught properly started I want to shut the door Yeah Bring your 5 16th with you. Yeah, because that one's got like a turn so you can put a screwdriver in there Okay, and we'll check see if it's got How they end up terminating things make sure everything looks good on it Because we got out here. What's that clock thermostat thing we got? Oh, man, I got silicone on my pants That ain't coming out Lovely and it's right in the crotch Wonderful And it's gray Yeah, I love that. What the hell is that? Is that for the fan or what is that? Let's let's figure that out on the schematic there See a thermostat down there I see Ambient there alternate ambient thermostat ambient thermostat Reduces ec motor speed At colder ambience and activates crankcase receiver heater during compressor off cycle only during cold weather So basically anything below 60 degrees, they're adjusting it. So it's a two speed fan Whether it's electronic controlled or if it's just a regular, you know multi tap. That's what they're doing it at 60, you know May not need to be that high. We probably could go a lot lower Say you probably go down a looks like it was started up in february of 20. So It's fairly newer 5.5 pounds of 404 Which is cool that they wrote that may want to use a better marker So it's for later, but Yeah, and you know, it'll be all right the 60 degrees. I mean you definitely start falling off around You know 70s, but coolers are made to run a lot colder You got a little timer here. So it doesn't short cycle Because when this thing pumps down and shuts off it sometimes can rise up and then it'll short cycle it Which they got it set really low 0.3. So basically nothing at all Up to as much as five Yeah, you don't want to go too high Because then it just lets the refrigerant come back and migrate to the compressor, which ain't good Um They've got it grounded. They use solid core wire He actually bent it around the terminal, which is nice You don't see that too well No, I I like that you're gonna do it that way We can double check their work double check their Make sure everything's good in there Let's get the refrigerant charges set first. We'll double check that when we get done Um, pop that rear cover off. You got to get into it there to take that little cap cover off of the uh over here Cyclases right there. It's underneath that white and green thing And I always like to check my caps and stuff to make sure they tighten them all back up again It looks solid You see no bubbles Never a bad thing Make sure that all the caps are tight and stuff That one inside there that one always gets forgotten usually that one, uh If you can untighten it with with your hand, you know that ain't tight These are kind of nice vows they got there so you can actually pull it down and vacuum A little bit nicer than the bone unit honestly Now see the um flow pressure switch It is on that uh tube right here This goes back these that instead of the There it is well, it's convenient so Let's see where that comes on at because it's set too Too high or too low Cause it's going to a negative So if you ever get a leak you want to make sure the thing shuts off before it gets into a negative Sucks air in destroys the compressor So we can check that real quickly and pop the top on it Probably the easiest way to get into it and then we'll put gauges on the suction side and see where our suction pressure is when we shut off And then we can kind of see where our super heat is when we get done. See sometimes it doesn't pay to have a long one Yeah, no this I had it on On here for whatever reason I use a regular one with an extension that way I can always separate it Plus it's cheaper when you buy it Until you start losing the extension, but that's the reason why I run an extension on mine Ta-da! What's this control right there? It's a headmaster Good deal, so How's it work? Yeah, I know what it is, but I'm not exactly 100 percent sure how worse. I know it's It's a bypass It'd be for your high side But for what for when and why? Well, so they're already slowing down the fan from low ambient which you can fan cycle on and off Which causes surges up and down up and down. This is going to be a little more steady So what you've got going on here is you've got the hot gas coming from the compressor Comes up comes down to here into the valve and right now you can feel it's not hot But if you grab here, you don't really want to keep going on to it You can tell it's not feeding which you don't want it to be once it's at the set point pressure Basically, there's a spring inside here And so the liquid comes out of the condenser because it's cooled and it comes out of the bottom Comes up and then goes on through if the pressure drops Down so there's the spring and a little cap in there and that allows a modulated flow of hot gas to come out with liquid too And then that goes to your receiver and on out to your metering device And basically what that does it tries to keep the head pressure up so that you can have a certain differential For your txv to work properly Because we don't have a differential txv will operate correctly and it causes issues So what ends up happening with this type of system your receiver here is your liquid uh tank to hold your extra excess refrigerant So what you'd actually do is you charge up to full-side glass and then you add you know for your winter charge Which usually is 10 15 percent as it gets colder It's going to stack that refrigerant in the bottom of the coil here and then when it modulates it can use it through there So it's just extra capacity if you turned off the fan it would build up heat So it would blocking it off and you're reducing the size of your Condenser so that's basically what they're doing is that it's it's more smooth that way So they're doing a combination of both which is even better yet. So it's a pretty decent little unit Let's go ahead and get suction gauges on there and check it and see where the Shut off off and on the pressures are because you gotta be careful It's not too high for the extreme cold weather and you got to make sure it's not Too low for when it shuts off and I have your permission to use this on the video, right? Yeah, all right, just want to make sure Oh, look at that. We have a friend sleeping See that Look down here at the bottom of the fan Oh Alfred the mouse man He got smacked in the head. Hey, you ain't supposed to be taking the nap there pal I'm telling you they don't even pay rent Huh? You have a mouse in there. It's dead. Well, what are we running there for our that saturation temperature? And usually the most accurate it's horizontal. That was something even my old butt didn't realize so Yeah, that's where they actually wanted that I've always Did either or I think but it you can do vertical but they prefer to have it horizontal So we'll be able to check see our soup heat is looks like we're running What is our saturation? I don't have these So we're running about 26.9 degree Is then this side tells you your saturation for your liquid side correct vapor side and then If you add your high side and your now when you have a receiver you can't really go off of that for sub cooling Um, the receiver is just kind of a brain dead way of charging the system that works I mean you got a site glass there and as long as it's full You're feeding a solid column of liquid to the txv Which you got to remember there's distance between this thing and the txv inside So you might have liquid here, but it could be flashing off on the way in What you can do to try to figure out if your receiver is at maximum capacity or not is you can pump it down And then you can heat up the side of the metal from top to bottom and then kind of run your hand down it Or I would start low because it's going to be the coolest low because you have liquid there absorbing the heat And as you come up boom, you'll be able to tell where that's at in that receiver So if you have one you're just not sure is it low or not or whatever That's kind of a little cheater method that you can use to kind of see how much refrigerant is in there So what are we coming in at super heat wise looks like 26 degrees So for cooler, I usually like to run somewhere between eight and 10 Um, you know, you can get away with a little higher, but that's quite a bit higher But the cooler is not very cold and you don't want to change the super heat until you get your box to temperature You can get maybe within five degrees of set point. That's about where I would do it at Two they got it hidden underneath here. So we'll get that off there There we go. So Put going to there and your gauge is zeroed out We're close enough to it to where we could check it out there because it's only like 15 feet away But if you were running through an attic and you've got all that heat Possibly absorbing into the suction line. That's when you wouldn't want to do that I've had times where you'll gain five 10 degrees between The inside unit and the outside unit So we're still about 28 Oh, I guess yeah, it helps put that on there. No pressure, dude. No pressure. Yeah, it probably helped bad No pressure At least they ain't calling your names man and treating you bad Not yet. You probably could do it from inside there Isn't there Yeah Oh my Then why Let's see where we're at here Well, look at that super easy drop. Yeah, it was 25 out there. We actually gained more heat So our super heat's down 12 Kind of hunt a little bit. We may need to open up just a little bit. We're I'll just open to the door that short duration of time. It's already added up to 44 So we'll wait just a little bit. It may drop down to 10 area when it gets the box temperature. So I'll be in the fan path while it's running so Yeah, just the very back nut I didn't get it with this big wrench Well don't go any more than that though because if you go too much it'll sit there and go up and down It may flood. I mean Because you went three three quarters area It's already dropping some But yeah, otherwise just start hunting going up and down up and down and take a while for it to settle down And see we got about a 10 degree td So when you have delta t and then you have td This is something I just learned not too long ago. Which is pretty sad. So say you want a 38 degree box You're running about a 27 degree saturation That's about 11 td temperature difference difference between your suction saturation and the box design temperature that you're shooting for That's the difference between delta t which is input versus input versus output Which isn't very high usually on cooler, which is pretty surprising It's not not very high at all not what you're used to like with an air conditioner So you're like 15 to 18 You're you're lucky if it's maybe eight sometimes even less Yeah, home air conditioner technically somewhere between 13 and maybe 25 28 depending on the type of system they got in duck working all that All right, so we're gonna do a pump down here make sure the pressure switch is set correctly and then Got to crank it in so go to the right. It's upside down. Everything's backwards crank it all in Shut off about five and then the pressure switch or the thing on the compressor released. So we're at 20 And what do they have a set floor here? We're at about 20 Maybe we might want to raise that a little bit because that's going to short cycle right now The reason why it's not cycling back on and off again is because we put that delay up a little higher Okay, well go ahead and let it out slowly and let's see where it comes on at It's all the way out You broke it. What's wrong with it? It would be the first thing you'd check A little pressure switch did so let's see if it closed What there it went Something released I wonder if they've got communicating crap going back and forth to the inside unit It may have told that controller inside. It may be controlling it more than what we know It very well could be because we've got now. What was our suction pressure again? No, it's not yeah, we're no there ain't no communication type thing out there just two power wires here Going in the top of the contactor. So there's nothing going out. You got two fuses there that uh are feeding controls that are going to here which go Over to there Which mainly is just your low pressure and high pressure cutouts. That's all you've got It's kind of scary the way they got that all wound in between those live wires, but We should if we would check the thermostat we would have known um We could raise our on a little bit Um, it's just the case But the cutout's perfect. I mean five to five five ten pounds You don't want to go into a negative and and some of these scrolls do not like to get down too low They'll go act up. So all we did is we made the difference a larger To counter the raise in it. So we only took it up. Maybe five extra pounds just to kind of make sure we don't go up Go ahead and pump our rack down again. See what we get So you can always watch your sight blast to see if it goes into It'll start flashing off it'll start to flash off Yep So you know that it's stopping the flow by seeing that If you ever got one you're questioning whether or not that side glass is full or empty You could always crank it down and see if it goes you can watch the change We'll go ahead and adjust that just a touch and then Go from there All right, just came back on at 30 so Good to go there All right guys, that's going to wrap that one up. We basically checked everything out. Everything was fine The biggest problem here was the defrost was only set for 20 minutes and four times per 24 hour period the System was running good. We just double checked everything made started was started up correctly And our apprentice there did a great job going through everything So if you guys like the video and you want to see more like it make sure you like share and subscribe And until next time guys, we'll catch you on the next one