All right, so we are live again. So what we are going to be doing today for the people that are just tuning in right now is we're going to be discussing some of the new aof um compliance things that are coming out to the market and uh. We're going to be talking about that with a representative from sportland, so we have jerry wallick here from sportland and of course i got brett wetzel from its refrigeration, podcast right next to me and uh so uh. First off brett, you uh a little bit different than yesterday so how's the show wonderful um, i'm exhausted um, i'm getting to the point where i'm just like.

I said information overload and - and you know basically just going through and and seeing all the stuff that i can you know yeah um, i still you know, i've walked around the show a little bit and uh. It's amazing how big it is. I know it's a little bit smaller than last year, but it's still really cool um. The attendance uh, i'm actually pretty impressed with the attendance, because i kind of thought it was going to be a little bit lower um, i'm still guessing.

I haven't heard any official numbers, but i'm guessing maybe we're gon na see total attendance numbers of about 20 000 people, but uh i'd be kind of curious. So what about you jerry? What do you think of the show so far? I think it's been good. I've been surprised, i thought it was gon na be way less yeah. You know, we've had good good booth traffic yeah.

I think we've had a lot of people watching you guys. So thanks for doing well, yeah, no problem so um. We want to talk a little bit. You know, we've been really harping on this and we want to make people more aware about the new awef compliance um requirements that are coming out.

First and foremost, i want to make everybody know, because i've i've seen the emails. I've had people ask me why, in the heck is insert name of manufacturer, are they installing these uh head pressure, control valves with the cutting or the bypass pressure so low, but they're more or less blaming the manufacturers? You know, and - and i guess for most, they would think that that's how you have to do it, because the manufacturer is the one that has their name on the equipment. But really this is a federal mandate to try to reduce the energy consumption on the light commercial sector, basically now uh the supermarket side. Obviously, you guys have uh, you know already pretty energy efficient systems or maximized to the most that they can get because they're more hyper-concerned about the costs.

Well, we're more we're more precise with controlling uh. You know saturated condensing temperature as well as suction pressure. So the the problems that we're seeing with the awef stuff - yes, we are still seeing that um. You know, you'll see it in a lot of single systems.

Um. You know that that are installed that you know. Maybe they don't have enough capacity or they're installing in a different part of the of the store with you know, the racks not available they'd have to run an excessive amount of piping yeah. So that's a lot of times.

Why, like these single systems, end up getting installed, but, like you know, we are still having a lot of the problems with the awef stuff, not that you know it's it's it's a design thing that has to be looked at. You know when working on it. So when it comes to the awef stuff um, it is a federal mandate, each manufacturers - if maybe you, can help me with this uh. Can you correct me if i'm wrong? Is it not just they're giving them a guideline of energy efficiency they're? Not so much saying that they have to do this or this they just have to meet a certain goal: correct, correct, yeah below three thousand square feet.

I believe it is yeah. You have to meet the aof uh guideline for energy efficiency and essentially it's kind of like sear, but for walk-in, coolers, yeah um, so everybody's known about sierra for a long time, uh, it's really a similar concept, you're just looking at total energy for the for the Annual so you're, taking into account low ambient conditions and high ambient conditions. So one of the easiest ways to improve efficiency is to let that head pressure drop, because that compressor becomes way more efficient, yeah and i've seen um a couple different methods. What we're seeing is uh added sub cooling circuits.

We kind of talked about this a little bit yesterday, but i deal with single component systems right single compressor systems, no variable capacity, so we'll see um single systems, they'll put a head pressure control valve on there. They'll float the head pressure down to about 110 psi bypass pressure for freezers about 150 psi bypass pressure for coolers, but then, on top of that, like i said, they'll add that extra sub cooling circuit, where it'll leave the receiver, run back through the condenser one more Time just to give you, you know the added guarantee that you have a solid column of liquid going to the expansion valve, then what they will do, oftentimes is add a two-speed evaporator fan motors, which is a whole other issue, but we can get into that later. But i really want to talk about the head pressure control valves here, so the problems that i've been seeing is issues within um. You know my mild climate, because here in southern california, where i'm from southern california, we have extreme heat in the summer, but very mild.

Winters i mean, on average 50 degree winters and we start to see issues with the the head pressure, not even getting low enough to bypass the head pressure control valve and then, when it does, we do start to see issues and i kind of wanted to get Your take on what do you think, as as contractors and as technicians? How can we better ourselves to kind of combat these issues? You know and - and what is happening, though, is a lot of people are going and buying? Let's say they have a compressor replacement and they'll go buy a condensing unit from the supply house, and i will say to be fair. The supply houses are not whether they're not educated on it and or they just don't tell the contractor. They are now selling them an awef, compliant condensing unit, and they may not be planning on doing anything to the evaporator. Changing the expansion valve or anything, and they may think like in the past.

They can just throw a condensing unit on it and call it a day right, but then come this this winter time, the mild weather they start to see issues and on top of that brett - and i have had pretty good discussions about this - but most of the Equipment i work on is massively oversized right, and so what i start to see is crazy, high evaporator tds, and then you start to run into issues. You know um. What like you've had a lot of experience with these high tds. What do you start to see on the evaporators when you run into these issues? So it'll be weird because, like you'll have a full column of liquid uh you'll check the filter, dryer make sure there's, no, you know temperature or pressure drop across it.

Uh you'll check your actual sub cooling, typically off of like a single condensing unit. You might get upwards, maybe if you're lucky about four to five degrees of sub cooling um, if you do have an extra sub cooling pass. If you talk to a manufacturer like heat craft, they'll, typically tell you that you'll get additional about 10 degrees of full sub cooling. And i guess you know, that's really.

You know maybe what they're trying to accomplish by putting that extra loop in there, because because we end up running that high td, basically, the evaporator basically doubles in size. If anyone isn't isn't aware of this, typically evaporators are sized for an 8 to 10 degree td. Now, what that means is, if we're trying to maintain 30 degrees, our saturated suction, will be 20 degrees. That gives us our 10 degree td.

Now the problem is most evaporators are sized off of that. So if it's a one ton coil at a 10 degree td, it's still a one ton coil and requires a one ton expansion valve, but because now we're doing the floating head, which is basically lowering our saturated, condensing temperature, which now is increasing our capacity of our Compressor, which now is lowering our suction pressure, which now raises a higher td and any time that you basically raise it from 10 to 20. That coil is no longer a one ton coil. Now it's a two ton coil, so you have to make sure you actually have that capacity of that expansion valve to accommodate that or you know, potentially have a little bit of extra sub coil.

So what are they actually doing? Because i mean i um, you know you're not guaranteed that you're going to get that sub cooling and a lot of people. Don't understand technicians, don't understand that that you know single systems. Um need to be charged to about anywhere from 60 to almost 80 percent, to compensate for when the headmaster actually starts to work. It's gon na pack that refrigerant in there, but also give you you know some additional sub cooling which might actually offset some of the awef.

You know uh high td, in my professional opinion, i'd be all day long. I'd want suction capacity control, but right your thoughts. Yeah, you know we when we looked at this situation, where they have, we knew awef was coming. We wanted to make sure that we have to train the industry, because you can't size an expansion valve for an awef unit like you had in the past, because in the past we had minimum head pressures of typically 180 or 210 depending on the refrigerant and that Guarantees you have a certain amount of um, you know pressure drop across the expansion valve, we would size commonly sized expansion valves.

You know between 90 and 100 percent there's a little reserve capacity. We rate them at 85, strokes. So there's there's: you can basically go to about 107 um. But if you do that today on an awef unit and you go down to 100 pound condensing uh, you have you have way less pressure dropped across that expansive valve and the capacity on that unit is way higher so that it's just you've got such a con.

You want to say the um. The pressure drop basically through the compressor across the compressor is way lower. It's way more efficient. It's like you, said it's going to double the capacity.

So one thing i want to add: i'm sorry uh like if anyone's ever looked at the bulletin 1010, which is the uh the expansion valve document, i'm real lame. That's why i know it but um. Basically, if you look at that, if you look at most of the expansion valves, they're, typically sized for 150 pound pressure drop and 100 degree liquid. So if you like, if you take any expansion valve that says, one ton valve, that is only a one ton valve at a 150 pound pressure, drop, typically and 100 degree liquid.

So anytime, you start changing any of those factors where, if you have a higher delta p across that valve, that's the difference between the suction, the liquid. It's going to increase the capacity of that valve and if you lower the liquid temperature by adding additional sub cooling, you also make that valve bigger right and we we tried to work with all the manufacturers. You know heat craft, keep right, httpg and copeland and we basically said all right. What's the worst case scenario, because we want to kind of make it easier for our technicians and the wholesalers out there right.

So when we put together this bulletin 500-10-awef and basically, we take into consideration the worst-case scenario with head pressure: pressure drop through the distributor and we resize the valve so that it can work at all the conditions. So we've really basically give you um. It's kind of a really easy thing. We should have been doing this for a long time to basically kind of simplify it yeah um, but it's really nice.

You basically look at your. You know, get your refrigerant um! You got to know your btus of your your system at design condition, and then you basically look look for it on the with the evap temp, like plus 25. Whatever come down, see 5500 btus, you go over and say all right. It's a double a port, so so just to clarify, if you guys, google search sporelin awef, it will come up, but you are also looking for tech bulletin 500-10-awef and that will help you um to size.

The expansion valves correctly now keep in mind, though we need to really pay attention to our equipment sizing. We cannot have a fudge factor in there anymore. We need to make sure that we are properly sizing and matching our equipment to meet the awf requirements and or to make this equipment work properly. So it's not just as simple as changing out a condensing unit anymore.

We really need to dig deeper make sure that the system is set up because it's very common. We have a lot of oversized equipment out there and while it wasn't working properly it got by, but you are gon na run into issues for sure um. I also want to stress the fact that there's uh and there's nothing wrong with this, but there's a lot of people that don't understand that when you have a head pressure control valve in a system that means that that system is now a critically charged system. Okay, unfortunately, a lot of people there's a lot of misinformation out there.

When we use the term winter charge, people seem to think that winter charge means you put extra gas in in the winter and you take it out in the summer. If a system is designed properly and that's the key, if it's designed properly, what goes into the design is a load calculation, an evaluation of the equipment making sure that your equipment is rated for outdoors. In the past, we used to take indoor equipment, throw it in a dog house and throw it on the roof that would get you by, but oftentimes. The receivers are not sized appropriately for a 50-foot 75-foot line set or in excess of that.

So we really need to pay attention to our component selection. Our equipment selection, there's a lot less fudge factor built into things. We really need to control the size of our equipment and if we try to throw you know just a new condensing unit on there and it's marginally sized or it's oversized, you are gon na be running into issues. Now i'm gon na share a story.

I haven't made a video about this yet, but i was recently working - and i talked to brett about this, but i was recently working on a heat, craft, intelligence system and long story short. We had a time delay relay installed up on the condensing unit that shouldn't have been there, but the equipment operated fine for most of the time, but what happened was because the equipment is slightly oversized. It's out in the palm springs area, where we had 120 degree ambient. It's now 50 degrees.

Right now we have a rather large condensing unit. So with the lower ambient temperatures, we also had some issues with the pressure control setting. Our system was doing some funny things and it would actually start up pumped down and shut off or it seemed like it was pumping down, but it was actually because it had an eev and we were running into issues because of the time delay relay what happened Was the the heat craft intelligence systems and the the beacon systems and all these the electronic expansion valve learns from itself and so the next cycle they'll base it off of some run factors that happened in the previous cycle. So in our situation we had an incorrect setting on the pressure control.

It was a perfect storm. We had a time delay relay in there that shouldn't have been in there and our system would run such a low suction pressure, because our compressor was massively oversized. It would actually shut the compressor off on low pressure, then that time delay relay would kick in. It would have a three minute time delay and it just caught caught in a vicious loop of learning from itself, and it just created an epic disaster all because of a time, delay relay and really a pressure control.

That kind of drifted that needed to be adjusted. But it had to do with this oversized equipment, and you know sometimes in the field we have to make certain things: work, manufacture, ship out equipment and they don't necessarily pay attention to certain things or people. When i say manufacturers, i deal with customers that order a lot of their own equipment, so they have manufacturers, contacts that say this should be fine. This will work whether or not they're actually associated with heatcraft, probably not they're, more or less a distributor.

That's selling direct to a customer, and you get a lot of fudge factors, so we need to get away from. The idea of this should be, okay should be. Okay is never a term that we want to use when we're sizing equipment. It's.

This will be okay. This will operate within this tolerance within this tolerance and it'll be fine, but we can't be having this wing in it stuff anymore, because man are we in for it. If we keep installing equipment incorrectly and not understanding, now on your guys's level, you guys have capacity control on my equipment. We don't have capacity control.

Our compressor is now a five horsepower compressor, because it's winter time it was a two and a half horsepower in the summer. You know i mean, and this happens so i am used to seeing really high tds and when i say this to brett he's like dude, you get and i get it. It's a compressor killer. But that's a very common thing for me is 20 degree.

Evaporator td. That's really common. We have a massive defrost strategy on most of our equipment, because on top of that, customers are leaving doors, open, they're, not using the equipment right so and then we're running a massive td, a really cold coil. And we have a lot of freeze up issues.

But i think the biggest takeaway from all of this is is we need to understand how this equipment operates more? We need to understand the process. Um me personally, i'm not a big fan of people, doing equipment, sizing and different things for me yeah. I know i can give the information to the supply house guy, but i love to get my fingers on it. I'm always curious.

I used to do that. You know what size equipment do i need we give them. Some specs and they'd give it to me, and i was always curious, like how did we get to that process, so i start researching it doing it myself and i'll even admit for a long time. I was oversizing the equipment too, because oh man, that doesn't seem big enough, i'm just gon na go a little bit bigger, but we can't be doing that anymore.

Well, it comes down to education, it's it's! The manufacturers uh working with so you're saying i don't know what i'm doing. No, no! No! Yes! Yes, that's what he just said. No, i didn't. I heard it no, but no really what it comes down to is is making sure the manufacturers are are, you know, are educating the people that are actually sizing it.

So excuse me, like supply houses, where you know a lot of times for these smaller commercial uh. You know applications they're, the ones like oh yeah, that'll that'll work for that. Well, like you said years ago, yeah fine, but now because all the new standards you know we run the risk of of it not working right and then it always falls back on the manufacturer. Oh, that that that's a it's uncle jing.

It doesn't work right. Well, it would if it would have been sized for that. Particular you know aspect right um. I also do want to bring to the fact when we talked about um refrigeration systems when they have head pressure, control valves being critically charged.

That's so important, um spoiling actually has a tech document. Uh bulletin 90-30-1 that'll help you on a tube and fin condenser. Let me reiterate a tube and fan so that is copper, tube and aluminum fins. Okay, that will not work on micro channel condensers.

It does give you a process to rather easily calculating the proper flooded charge for the system in whatever conditions you set, so you set the minimum outside ambient conditions within the mathematical calculation that they're going to give you. So it's literally just a couple measurements. Multiplying a few tube lengths finding out the equivalent length of all the copper in the system, calculating the uh the. What am i looking for internal volume of the pipe there's, a name for that um, the density factor, the refrigerant and throwing that in there and then you come up with a calculation of the proper flooded charge.

But let's reiterate this: a winter charge is a a technical term that we use. I don't know technical, but it's a term that we use for the longest time. It does not mean you add refrigerant in the winter and you remove it in the summer. It doesn't, it doesn't mean that, are you sure, i'm sure, okay, if the system is properly sized, i have to say that with the caveat because yeah, if you have an indoor, condensed unit, mounted 50 foot away from the evaporator and the roof, okay, i understand it's Still not designed right, but i understand why someone might have to add refrigerant or remove refrigerant, but um if a properly installed system, at least with what i'm dealing with in the supermarket side.

Are your receivers always sized to pump the entire refrigerant charge into them, or are they so big that you can't do that in the summertime? No okay in the wintertime, you know we can pack a lot of refrigerant if it's a tube and fin, we can pack a lot of refrigerant in in the actual condenser. So if we don't have that capacity to you know, because you got to remember the the the lower you get that liquid temperature, the more dense that liquid actually is, it's almost like it's comparable to a higher octane refrigerant. If you really think about it right so running, running refrigerant at 50 degrees is like running clots in your in your civic. You know what i mean, or basically it's going to add a lot more capacity, so same principle, where you know if it's a lot colder out, you're going to be able to pack more of that refrigerant or same thing, when you're recovering refrigerant from a single system.

I see a lot of guys using a coiled up, uh piece of cool air yeah yeah, a piece of tubing that they throw in an ice bucket and they can actually fit more refrigerant. And that's because the you know the density, the density changes, because it gets more dense and also the volume, because we deal with that also in commercial with supermarket stuff we're. Basically, you know i've dealt with a store where basically, this, the liquid receiver level is 20 percent sub coolers, not working. Then, all of a sudden i get the sub cooler working now.

I have zero percent well, basically now because we're sub pulling it all the way down to 50 degrees um. Now that liquid is a lot more dense takes up less space. So now it takes more refrigerant that would have been the receiver to go out in the system to take up to to match that where we took it away because we changed the density. So on our stuff, you know we're always trying to make sure that our receivers are sized appropriately, so they can pump most of the refrigerant charge into them.

And if you i can tell you this right now, if you have a receiver on a condensed unit and you cannot pump down the entire refrigerant charge, you cannot add winter charge to that system. You're gon na have a problem, so i have a question for you. So, like my my for single systems, my rule of thumb is anywhere from 60 to 80, as long as it's above 75 degrees, because we don't want the headmaster or the lac to basically start. You know packing refrigerant in while we're trying to figure out what 80 is because then summertime would be way overcharged um.

What were your thoughts on that? Well, you definitely have to take into account what head pressure control valve. You have whether it's 180 pound 210, because a lot of people don't realize that, once it gets below 70 degrees, if you have 180 pound valve you're starting you're, starting to back up fritter in the condenser, absolutely you definitely have to take that consideration and use the Charts that you talked about with 90-30 um and basically you just got to calculate the charge and weigh it in and then know how much is already in there. Let's say using the chart. You're like i got 20 in there already.

Well then, you got to add the rest of the 80. So what i'll do is once i've calculated the proper flooded charge, then i will pump down the receiver, find the liquid level and mark it for the next guy. So, on our side, we are not running into receivers that we can see liquid levels or anything like that. We have pretty dumb systems.

You can kind of do a torch, oh yeah, i don't ever use a torch because we use a heat producing device. We're not gon na we're, not gon na say what the device is, because you know, but no, yes, you can use a heat rhythm device. Thermal imaging camera can use a heat producing device and a thermal imaging camera. And yes, you can see liquid level and i will say that you know for the longest time most of my career use the back your hand find the liquid level, but since i've started using a thermal imaging camera that actual liquid level that i feel with my Finger is a lot different than the liquid level.

You see with the thermal imaging camera, so you can get a lot more accuracy, so the concept is what we're talking about is basically, if you're heating up that that refrigerant, you know, if you're going uh up and down up the up the receiver, basically the liquid Refrigerant is going to absorb the heat, so it's actually not going to get hot and anywhere where you have. The vapor is going to get hot because that liquid isn't there to actually absorb the heat. So there's no state change, so it gets hotter and takes that sensible heat and that's why? What we're talking about? Actually works um. I will say too that let's make sure that we address the fact that at any given time, you have to make sure that a fully pumped down receiver's level does not exceed the 80 number.

And if you do exceed the 80 number, you run the risk of having a catastrophic failure of that receiver, some sort of an explosion. Now, yes, there's soft plugs and different pressure relief devices in there, but you don't want to test those limits. You want to make sure that you don't overfill your equipment for safety reasons and that's why we're highly recommended always to actually put the solenoid or electronic expansion valve as close to humanly possible to that evaporator. So you know because the systems aren't.

You know a lot of systems weren't made to have a solenoid all the way back at the condensing unit and pump 100 foot down a line down or a 50-foot line down. So if you do have a system where it is sized properly and you are having head pressure issues when it pumps down, look at your look at where the actual solenoid is recommended that it's close to humanly possible to the evaporator or where the t is. You know to basically feed it. You know a multiplex type system and in some of the most extreme conditions, where you know you just can't get it to pump down right or anything.

What you can do like brett's saying is, you can move the solenoid valve. It is up on the roof. You can that's a last, ditch effort. You can move it down to the equipment to try to get that extra 50 feet of sprinkler liquid line or sprinkler.

We just put a sprinkler on right. There you go for the sprinkler. That's that's like get me through the summer when i can't find the condenser fan motor day, so i'm just kidding. Please don't.

Please don't do that. So let's address the fact with micro channel condensers, so we have micro channel condensers out there and we do have to understand. We already set it i'll reiterate that spoiling's 90-30-1 method does not work on micro channel condensers. That creates a whole nother issue for that you're.

Going to need to reach out to the manufacturer of said equipment to find the proper liquid levels. Ironically, i actually with certain manufacturers. They just tell me to put the maximum amount of refrigerant in that system, which can be a problem right so with what i'm dealing with i'm dealing with light commercial systems, nothing bigger than three four tons, so yeah maximum charge 25 pounds or something like that. But if you actually calculate a flooded charge for some of that equipment, you know if you put the max charge in there at 25 pounds you might find out that the calculated flooded charge with all the refrigerant there might only be 15 pounds.

So, theoretically, you are selling the customer a little bit of extra refrigerant, but if the manufacturer doesn't have a better way to charge that system uh i.e the micro channel, because it's so my new um, you know sometimes they just i've had them tell me just fill The system up to the max charge, and so you have to find the published data for that refrigerant. It's not going to be just because it's 24 pounds of 404 does not mean it's going to be 24 pounds of 448a or r22 are insert, because you have to pay attention to the density factor of the refrigerant and find out that proper charge and with the Aof units because they have lower head pressure, settings you're not going to need as much refrigerant as you did, with 180 pound setting or 210 right, so you're not going to flood all the condenser. You don't need to. You want they're going to let the they're going to let it float down yeah and in most situations, like i said i and most of my times, i'm never going to hit that number out in socal because we're hitting 60 degrees outside and it's it's not quite There, so you know we're not necessarily going to hit that, and what's interesting, too is is when i do see um when you actually find out from the manufacturer how much extra refrigerant you have to add on those micro channel condensers, it's like scary, how low that Number is, you know, because we're so used to tube and fin and we're like yeah.

We need to add an extra eight pounds to that system, and you know you find out it's it's half a pound and you're like for a three horsepower. You know i mean oh my gosh, but that's the efficiency of a micro channel condenser. They can do so much more, so the like of the slabs on some of the supermarket. When i say slab.

Basically, you know i'm talking about a micro channel condenser. Typically on the hussman units, i mean they're they're fairly big they're, like four feet by four feet, and that holds, i think, like two pounds or five pounds of refrigerant. Where, typically, you know in the winter time, you could probably jam 30-40 pounds in there. So you know that's why a lot of companies are going with the micro channel, because it's a big cell to have a reduced refrigerant charge, because then they don't get charged as much with the government.

You know they get. They get a tax break once again, just like the the the you know, the awf stuff. You know right yeah, so i think uh. The takeaway is that us as contractors us as technicians, need to do a little more research, make sure that we pay attention to what we're installing make sure.

We understand how the manufacturers want it installed and make sure that we know what's going on with our systems. With today's equipment, it's so much more efficient, there's circuit boards and everything, there's sensors everywhere, uh proper efficiency. It will not operate. If it's not charged right, it will not operate right.

You have sensors and everything that are going to go nuts. If it's not installed right. We have to follow installation instructions and we have to dig deeper other than just having a supply house tell us that oh yeah, this should be fine. You know we need to look into there really.

Another thing that we really didn't cover um, especially in the retrofit market, is liquid line sizing too that's a really important thing, especially when we're changing over to these new refrigerants. You know going from an r404a system thinking that we're just going to change the condensing unit, because there is some manufacturers out there that say: oh yeah, you can use 448a in a 404 evaporator. You just got to make some adjustments here, but what you don't know is now your liquid line is massively oversized because we don't need a half inch liquid line going to that evaporator anymore. Sometimes we might even need a quarter inch liquid line.

You would be surprised to read installation information and you start really digging into refrigerant line size and you're like wow. That's really small one of the other things that gets overlooked. A lot is the distributor nozzle, yes um, because what ends up happening like you can have an old unit that was r22 and convert to 407a and because of the the pressures and the glided refrigerant a lot of times. You have excessive frosting that ends up happening on the distributor tubes and you have less you know actual flashing going on the in the evaporator.

So i mean i know on commercial a lot of times. It's wham bam. Thank you, ma'am get it done, get it in, but like with some of these more more delicate single systems where you know the ambient really affects. You know how the pressures react.

Um be aware, you know, of how it's supposed to be most most uh engineers, usually uh design, the the pressure drop across a distributor, nozzle 35 pounds uh, that's the tubes and the nozzle yeah that for like four or four a or four forty, eight a b. Thirty five would be what you shoot for. Yeah fortune is a little higher, but that's you know 45 and then anything. That's like 134a type pressures is 25.

and i know it seems kind of you know weird me bringing this up, but what can potentially happen? Even in refrigerated, you know cases that you find in a gas station supermarket doesn't matter. Sometimes what will happen is because you'll have that excessive frosting on the distributors, that frost will actually grow once the frost grows. It might grow onto the suction line, which then will throw out your superheat and because we're using all electronics nowadays to try to get that energy efficiency. It's getting the controller essentially is getting bad information.

So it's going to make bad decisions and affect the operation of the system, so it's just so important to follow proper installation practices lean on the manufacturer, find out their requirements, make sure your equipment's sized right, especially in the retrofit market. I mean even in new installation too, but we got to make sure that we are sized right. Is there anything else that you think we need to cover jerry um? I think you know. Most host sailors are they're going to stock all awf equipment.

So if you're going to replace just a condensing unit, make sure you double check the sizing of the expansion valve, there's probably 90 chance, you're gon na have to upsize it so take that new account, um and yeah just follow the instructions and use the tools we Have and there's a great uh youtube video on how to use that 500 bolt, and we just mentioned um david thomas one of our product managers put it together. So if you look up youtube, uh go to our youtube channel and look at awef training. So it's like a seven minute video that walks you how to use that and i'll put a link to the youtube channel in here. But it is spoiling video on youtube but i'll put a link in the show notes of this video brett from the advanced refrigeration.

Podcast find information about him at advancedrefrigerationpodcast.com, um yeah, we're good yeah, we're good we're going to clean they're in this jerry. Thank you so very much absolutely thank you! We'll catch you guys on the next one.