This video is brought to you by sportlin quality, integrity and tradition, real quick before we start the video off i've announced it on social media. I just want to make point of it in a video, too, is that we are back in stock on the hats um. For the longest time we've been out of the small, medium hats and uh. We've got plenty in stock.

Now we also had a restock on the large extra large hats, so if you guys are interested they're available on the website at hvacres.com, okay, as far as the hats go, i made sure to um. When i had these hats designed, i purposely made them with a black underbill, so that way they don't get your fingers dirty. I purposely designed them without my snowflake logo on them too, because i wanted them to be um, not an you know, a a blatant advertisement of my brand. You know it still has my color scheme and stuff on it, but i wanted people to be able to wear them at work.

Okay, um. We also have uh plenty of beanies available on the website, the cuff, the non-cuffed sweatshirts shirts, all that good stuff. So we'll go ahead and get on with the video now well today it is a sunday and we got an emergency service call on a walk-in cooler, not working it's in cool mode, but it's at 43 degrees and i'll get you guys a better image here in A minute, but it's all iced up inside, so we got two coils on this guy. We got one over there too, so we got to get power turned off and then uh try to figure out what's going on here.

So i went ahead and put it into a pump down by hitting the four service button that way the eev shuts completely, and then we can uh make sure that the um compressor doesn't continue to run. So the key is to make sure that it's pumped down before you turn off the evaporator. Occasionally the capacitors and stuff won't close. The eev, supposedly the capacitor, helps to close it when it powers down, but i've seen times where it doesn't close the ev and then the condensing unit continues to run so try to pump it down before you can use the service mode or you can just shut Off the disconnect for the condensing unit too, but i went ahead and shut off condensed unit and the evaporators and it looks like there's a bunch of plastic tape, maybe stuck on the back.

So i bet you it's gon na be a dirty evap and then we'll definitely get to the other one too. This is our second coil and it's not iced up, but it's dirty so we're gon na clean this guy. At least we don't have to de-ice this one we're just de-icing the other coil fan, blades and fan guards are extremely dirty, so i have them soaking in a bucket with some yellow venom pack, cleaner right here stuff will work wonders on it. On the plus side, the drain works really good and it's draining really nice, so we'll just fill it up until the drain.

Pan fills up then stop and let it drain and kind of rinse and repeat so. The ice is not too too thick but um. It's still taking a while they kind of got low water pressure here, so it's just, but they got really hot water. So that's a plus, so we're just kind of steaming everything off.

I try to get as much from the front of the coil as possible and then we'll clean. You know around the frame and everything so so i am having to get from the back side and that evaporator's got a bunch of plastic all stuck to it, and it's also pretty dirty. So we're going to put some of the uh yellow, uh venom pack cleaner. On there and get it to break some of that dirt and stuff down too, the scrub down is happening right now, so scotch brite pad some cleaner and go to town.

Some elbow grease. Get these things clean. When doing these, you know i try to have everything that i know. I'm gon na need my wrench, my allen wrench a set of dikes a nut driver.

You know like try to have it all ready so that we don't go back and forth to the you know, tool, bag or whatever, and just remember you know putting these back together. It does matter where the wires are going. You know you want them, you don't want them running over if you can get away with it. Don't zip tie the wires because it makes it easier for the next guy sometimes you have to, but it makes it easier for the next guy when he has to defrost this, because it will have to be defrosted again.

It's a walk-in cooler customer leaves doors open. All the time and stuff so try to make it easy on yourself for the next time all right. I got that one running over there and i got this one running over here and then now uh we're just going to wait for it to turn on and then we're gon na go through and check the settings see if we can figure out why it iced Up i'll tell you right now: they're really bad at leaving that door open, so being that this coil was so dirty, i'm pretty confident, that's why it froze up, but we're still gon na check everything out all right. So the setup here is.

We have a master and a slave coil. Okay um this one controls everything. So what we're gon na do is go through the program review, uh, defrost, air electric should be air, that's correct, refrigerant should be 404, it is box. Temp 35, it is super heat should be about 10 degrees, uh negative 10.

What the heck is that about! That's weird huh slave, no dfn that is dfn, i'm looking through my chart right now. Dfn is number of defrost. Only two really yeah we're gon na go ahead and increase that we're gon na increase that to six defrosts enter dff is fail safe time. We're not gon na go 40 minutes.

We're going to go 20 minutes enter. Dft is defrost in temperature. We're going to move that up to yeah 45 is fine, enter dfs. That's offsets! We're not worried about any of that other stuff, but that super heat set to negative 10.

What why does it even allow you to do that? That is weird super heat. Why would it let you go that low that didn't make sense? It doesn't. Even let me go to negative 10.. Why does it that's random huh enter? I don't know what that was about.

That was a glitch okay. So now we're gon na go to the other coil make sure that it's set up as a slave okay program review super heat: seven, i guess i'll leave it there, eft 45 minutes. Okay, dft is uh defrost uh termination. Temp slave should be yes, correct, okay cool, so it only gives you limited settings because it's set up as a slave, so everything else is controlled from the other side.

So so far, so good we're going to jump on the roof and make sure we got a clear sight glass. I wanted to make sure that this coil was cooling, because i was a little concerned as to why the other one was iced up. But it's clearly cooling because you can see my breath and it's not that cold in here. So i'm gon na go ahead and put a thermometer right there.

So i can compare it to this guy. Oh yeah, we're gon na go ahead and jump this guy's superheat down to seven like the other coil enter you just got ta be careful. I think we'll be okay with the eevs. It controls the superheat a lot tighter.

You wouldn't want to go seven on a walk-in cooler on a normal thermostatic expansion valve, typically without an accumulator on the system because it can overshoot, but with eevs they can control it. A lot better, so you can go lower, get a little bit more efficiency out of the coil. Come up onto the roof side. Glass is running clear, it's kind of hard for you guys to see it.

I'm sure there's a lot of wind noise there, but yeah we're looking good condenser is clean good on that all right, yeah we're just gon na. Let it come down to temp, so i waited for it to come down to temp uh. It's been running for maybe an hour and the coil's all frosted up really bad. What's going on here, so i went ahead and probed up i'm waiting for it.

I put it into a defrost, so i'm waiting for it to defrost and then we're going to check the uh suction line temperature and compare all the numbers to what the board is actually reading all right. So it defrosted - and i turned it back on - i verified that all my sensors are working. I verified that um transducers working everything's, accurate compared to the field piece, stuff temperatures and everything, but look at my td 29 degree supply dry bowl with a 12 degree saturation. That's an extremely high td and it's already frosting up and also that's the other thing too.

The coil is 100 clear. I checked it with a flashlight. You can see right through it. It's almost like there's a restriction in here because we're maintaining super heat too.

Let's go back super heat well superheat's low at the moment. Let's go to monitor superheat four degrees and it's climbing, so super heat's. Fine esp is the steps 227 steps. Sct is suction temperature, i'm seeing 18 degrees on here and we're seeing 17 degrees.

That's close enough! Sst suction saturation temp it's 12 degrees and we're seeing about 12 degrees. Scp is suction pressure. Field piece says 45, this says 46, it's all within reason, but we're frosting up like we've got some sort of a restriction. It's interesting i'd say too that the valve is a little noisier than they normally are.

The other thing too. The box temperature is 37 degrees right now, that's what that thermometer says and that's what field piece says on here: uh we're saying 35 on here. This is interesting. Oh, i was curious, so i went ahead and set the superheat higher to about 12 degrees or 13 degrees.

I can't remember currently right now, the superheat's at 19 degrees according to the board, but according to field piece, we're at 27 degrees, evaporator superheat. So what is going on here? I went ahead for giggles and change. I i verified that the uh, the suction temperature sensor was really accurate and it was but there's a spare in here. So i went ahead and swapped it just for giggles just to make sure there wasn't something intermittent going on in there, but still don't know why we're overshooting like that on our superheat.

So we're saying 27 degrees on here make sure that we're getting good, let's confirm, suction temp is 30 degrees. So let's go to suction temp and see that it's accurate sct. I can't remember what it is. I got the thing right here: sct, so that says 28 degrees, and this says 30..

So it's about 2 degrees discrepancy this one's getting closer to 30.. So the suction temperature is reading accurate, okay, suction saturation, seven and we're about six point: seven, seven! So that's accurate! What is going on here, so, let's get out of there and go to monitor and look at what our superheat's actually at right now: 21 degrees and now we're saying 20.. So no, our super heat's accurate. What is going on here! This thing is being a chore right now, so you can see since i adjusted the super heat higher, the frost is pulling back because the coil's not getting as cold huh.

This is interesting, so i went ahead and set the box temperature a little bit higher vot. I set it for 37 degrees 38. We're gon na go for 37 37 enter okay, super heat, we're going to keep it at 12 right now, just temporarily, i'm going to come back. I want to follow up on this in another day.

I think we're going to be okay. I also set the defrost up higher. Let's go right here, dfn. I set that up to six defrosts a day, so um, like i said, we're gon na.

Let this run like this uh. The system is satisfied actually because it's 36 degrees and we have a set for 37., so we're going to let this run and then we're going to come back and follow up and i'm going to bring some sensors with me too, because i don't have any more Sensors um and we'll check on it again, then the other one is not frosting up at all, though so that's what's kind of bizarre, but that one's cooling, it's kicking butt. It's freezing my butt off right now, as it's blowing on me, so yeah we're gon na monitor this and i'll come back with some other sensors and we'll verify calibration on the other sensors. Just to be sure i mean they're all like a degree or two within reason.

You know it's kind of weird all right. We are back today, um. What i'm currently doing at the moment is we're going to be check, we're going to kind of start over a little bit, because i can't remember exactly what all i did over the weekend, but i want to be a little bit more thorough, go through it today. It's not iced up it's running at temperature, but i'm afraid that this coil is getting too cold and it's frosting up, but i also need to verify that the other evaporative coil is actually working.

I felt like it was cold last time so um. This is my temperature difference across the coil 41 to 27. This is the one that was icing up. Um we're gon na go through check the compressor, we're gon na isolate each coil see how they operate.

I know that when i was here over the weekend, i was really concerned because we were running a really high td temperature differential, the difference between the return air temp and the suction saturation temp. So i want to look into that a little bit more all right. This is our second coil. This is the one that was not iced up now.

I did not check it when i was here on saturday, but it felt like it was cold. But look at my return and supply temperatures are pretty much equal and it doesn't sound like the eev is feeding there's an electronic valve right there and it says that we're open 255 steps. This coil is not responding all right. I turned off power and we're gon na get back in here.

We're gon na check this uh coil on the eev um to see if we have resistance, there's a specific way to test it. You got ta open up the manual, but we're gon na pull the coil off um, take reference to how it's plugged in and then we'll get this guy off and then we'll uh take it outside and do a continuity test on it. Let's see if i can get this thing off there, we go and don't lose the screw or the nut like. I did make sure you put that back in there.

Okay, we'll take this guy out and uh go test it all right. So the second coil is not working, so we pulled out the stator for the eev and we're going to compare the two of them. We have a new one that we or we went picked up so a to b. They actually tell you how to do it.

A to b at 75 degrees should have 150 ohms, granted it's a little bit colder than 75, but let's just show you what we find so a to b, two: three okay! So let's go the other two on this one: 146: okay, so that first uh winding right. There is jacked up. So let's go a to b on this one. This is the new one, 147 ohms and then c to d 148 ohms.

So we're going to try just changing the coil. I don't want to have to change the whole valve if i don't have to so we're going to slap this guy on there and see how the eev reacts to that. But we definitely have a bad winding in this one right here, all right. We started up the coil.

We immediately heard the eev open up and uh it's running now. So let's have a look at what the uh and look at we've already got a temperature difference between supply and return. So we just had a bad coil for the eev or skater, so we're gon na. Let it run and then we're gon na go ahead and evaluate the system.

Now, that's more than likely why my td was so messed up too, because well i'll point it out to you right now: we'll check everything so the system's still pulling down, but the evap td is already dropping significantly. So that's a plus um! This is just on the main one, the superheat's still high too, but that's dropping. I went in and set all the settings back to what they should be too seven degrees. Super heat, 35 degree box, temp um we're looking a lot better, yeah yeah, i'm liking.

This a lot more, so basically, we were trying to cool the whole box with one coil and while it'll do it, it was just kind of struggling to do so and it got us through the weekend. I didn't want to investigate too much more um we're going to go up and look at the compressor too, and then also i want to see what the td is on that evaporator and make sure everything's good with that one all right. So this is the other coil, the one that had the bad uh solenoid core stator for the eev, obviously the superheat's low, because it's kind of finding its happy medium right. Now, i'm trying to adjust it's still stabilizing out.

But let's look at our uh, our uh. We have a temperature split across the coil as far as air temperature, 39 degree, return and 35 degree supply uh. We're currently running at an 18 degree, evaporator td, but it's still dropping because it's still pulling down so we're doing good on this one. This one's, i think, we're gon na be good.

This was our problem and this is why our td was so high the other day so um, okay, so we're gon na go up onto the roof and have a look at the compressor too uh, but yeah we're looking good down here all right. So we are running on the roof right now. Um. The sight glass is clear, i'll try to poke in here.

Hopefully that wasn't too loud. For you guys, the sight glass is clear, um i'd say the ambient temperature outside is probably 75 degrees, but this is a micro channel condenser. So i'd expect a condensing temp over ambient to be about 15 to 20 degrees somewhere in there so and looks like we're slowly creeping up, but it is kind of cool outside. So i'm not seeing anything.

That's scaring me on this guy. It's running everything looks okay. I believe that our problem with the td was that only one coil was running with such a big condensing unit and then um that coil. The reason why it iced up, i think, was because it was just trying to cool too much of a load all by itself.

Once we put in the second coil, it doesn't struggle as much uh. I think we're going to be good to go. Why the the the stator or the coil failed? I don't know this is the second one of those that i've had fail like that um. So it's hard to say, but i don't think i need to change the valve.

I do have the rest of the valve body because the the heat craft crap you buy it as a whole kit, but i'm not going to change it right now so um, that's it we're going to wrap this one up tell them to keep an eye on It we do have some more service calls here, we're not going to do today. So when we do come back for the other service calls that'll give us an opportunity to follow up on it. It was a sunday service call. I really wasn't in the mood to be spending a bunch of time there.

Okay obviously took some shortcuts, obviously got the system operational and, let's be fair, though i had a good feeling. I knew that the system was going to operate properly. I still felt a little bit unsure about that. Second evaporator coil.

It was interesting, though, because it felt like it was blowing cold air. As i was standing on the ladder man, i was getting hit from the side from the air from that one, but it must have just been recirculating through the box and blowing out and even still when i was standing in front of that second coil and you Could see my breath again, it must have just been pulling air from the other side of the box. It's very interesting, but when i actually got my probes on it, when i came back two days later, obviously the coil wasn't working. Okay, so the the coil or the stator for the eev, the electronic expansion valve, had failed and it wasn't allowing the electronic expansion valve to open and close properly.

Okay. On another note, i was a little bit intrigued as to why we didn't get an error message, because those uh those evaporators typically have logic built into them, and they'll usually tell you if there's a problem, but i'm kind of curious when they're set up as a Primary secondary or master slave coil, if the problems um, you know, follow or happen you know like or if they they're they're tracked. Essentially, i guess is what i'm trying to say. So it's interesting that i saw that it didn't give a superheat error.

You know which i thought it would have, which i've seen superheat errors on these things before when there's no change in superheat. So i was a little bit intrigued as to why it didn't error out on that. But regardless we got the evaporators cleaned up. We got the the first one de-iced we got the solenoid coil or the stator replaced for the eev and the system was operating properly.

Okay, now i was talking about the evaporator td being high. I did make a mistake - and i put some text up there to say that i was referencing - that the evaporator td was really high, but i was my mind was not following. You know my lips weren't, following what my mind was thinking, so i was looking at the right numbers in the beginning of the video or in the middle of the video when i was talking about the td being high, but i don't know why i said the Supply air temperature, the supply air temperature is not what you use for your evaporator td. You use return air temperature and suction saturation temperature, so anyways all is good.

Customer was happy. We got the equipment operational and working properly um. You know when we size this equipment. Something to remember is that in a pinch you know, as long as you don't have big loads coming into the box and doors being open for crazy amounts of time.

In a pinch you can get by with one of the coils, it just depends on how the equipment was sized. Okay, this particular customer. The equipment is size because they bring in hot food. They try to cool it off.

They kind of use the box as a blast chiller, even though it's not but they'll, bring in carts full of hot food that they just pulled out of the ovens and different things to cool it off inside the walk-in. So we have to size the equipment accordingly. So in a bind it will survive with only one coil running. You need to be careful about that, because you know, depending on how it was sized.

If it wasn't sized appropriately, then one coil could make the whole system go down. You know if it's just operating off of one coil, but you just kind of need to know how the equipment works. I was very confident when i left that it would be okay. Until i came back, it was bringing the box down to temperature.

I made temporary adjustments because how it was frosting up. I adjusted the set point a little bit higher that kind of stuff. When i came back out like i said we went through and we set everything back up appropriately got it all. Dialed in everything was working properly and the customer was happy.

Okay, so understand that you know. Sometimes, when we're going out on an overtime service call, we might be just putting out a fire just getting them operational. So that way we can come back in when we're not on overtime and thoroughly go through it, but you know and another thing too um. I don't when i'm working on these calls the on-site management typically depending on who i'm working for okay, this particular restaurant chain.

I actually don't answer to the on-site management. I actually answer to the corporate office. Okay, so on-site management is not given in that situation. Again, you guys need to refer to your supervisors.

Your service managers, whatever the on-site management, has no authority in this situation over me. Leaving because it's overtime over me charging overtime or any of that stuff, okay, because i have approvals from the corporate office. If a walk-in cooler is down, we go out there, you know if, if a walk-in freezer is down, we go out there, it doesn't matter if it's overtime we spend as much time as we need on the job. Now, in this situation, i felt confident and comfortable leaving the job and coming back and finishing later because it was operational, and i did call to follow up the next morning too.

Just to make sure everything was still working good and it was so. But just you want to understand the procedures and policies, and you want to talk to your management and understand how you should interact with the customers and different things like that, because every single restaurant may change now this particular restaurant chain. I know what i'm allowed to do. If i go to another restaurant chain that i work out, things are totally different, so you have to learn how each restaurant chain works, what the chain of command is, who you answer to and that kind of stuff? Okay, so with that being said, i really really appreciate you guys making it to the end of the video.

Please leave me some feedback down in the bottom. Let me know um you guys digging. Everything is you know, are these helping you do you? Do you have criticism, give it to me, i'm always open. Okay, just understand, because people do occasionally come through with criticism, and i am totally willing to hear criticism.

I'll listen but i'm not necessarily always going to follow, suggestions, okay and i will say - and it's not just one person - i've gotten feedback from a few people that they don't like the end of the videos that the wording is too long. That's not gon na change. Okay, i appreciate feedback and i appreciate people telling me, but i feel like the end of these videos, has a lot of very good information and i don't care if youtube analytics tells me that people aren't watching till the end or anything like that. There's a few people that are - and i'm still gon na make these, because i find that there's very valuable information in the back of these videos and i'm not making these videos with the intent of growing to be the biggest channel in the world.

I'm not treating it like a business, i'm not treating it like this is my job or anything like that, because all i'm trying to do with this whole youtube thing is share the little bit of knowledge that i have, whether it be mistakes that i've made or Triumphs that i've had that's what this channel is about, it's sharing and just getting the information out there. Primarily, this is actually for my own employees, but i do share it with you guys too, and i know that you guys get benefits from this too. So keep in mind. If you do have feedback, please give it to me.

I am always interested in hearing your feedback, whether it be you know things to do better at the way i work or you know, if you want to give me feedback on the videos or how they could be better sure, that's great, but just remember just because You give feedback, does not always mean that i'm gon na follow what you say: okay and don't take offense, and i don't take offense when you guys criticize or anything like that, like that's how i grow is from criticism, so please keep it coming. Let me know: okay um. Do me a favor guys? I've been mentioning this a lot lately. We need a lot more kindness in this world right now and i know i'm nobody and i know i'm a small little blip on the radar.

But if i could get one of you guys just to to interact with someone differently during the day be a little bit more kind, i would feel successful. Okay, i would feel good. I feel like being that i have a platform. I do need to encourage people that you know it's crazy out there.

The world is crazy right now and um. You know we don't have control over a lot of it, but in my heart i know the thing i do have control over is how i interact with people and how i act around people. So i try to be as kind as possible, even if i'm having a bad day or even if someone else is being a jerk to me, you know sometimes they're going through some crazy stuff. It doesn't excuse them for being a jerk, but you know what i don't necessarily need to reciprocate, that you know nastiness or, or you know, be a jerk to them in return, sometimes just bite, my tongue kill them with kindness kind of a thing.

You know we don't need to instigate things even more so than they already are. I feel like everybody's just on edge lately and - and we just need some more kindness, so please just do something nice for someone. It can be anything guys. Random act of kindness buy someone's coffee when you're in the drive-through buying lunch buy the person's lunch behind you.

It's it's the simple things you know we give that out and we don't expect anything in return. That makes us a better person and maybe on the flip side, something better will happen to us too in the future, but you know what the way that i go about it is. I just keep acting like a good person trying to be as kind as possible to anybody, okay and understand that sometimes people go through bad days. Okay and again, sometimes they act irrationally when they're having a bad day, but we don't know what's going through their mind.

Okay, guys, i really really appreciate you guys making it to the end and thank you so very much for tolerating my craziness and my ups and downs and all this stuff. I really really do appreciate you and uh. We will catch you guys on the next one. Okay,.