So so, ah, it's time to chill out and get ready for a mediocre q, a live stream if you're old enough grab yourself your favorite adult beverage and if you're not stick with apple juice, put your feet up and relax. If you have any questions, feel free to ask them in the chat and now, let's queue up the intro music yo. How are you guys doing this evening? Hopefully you guys are doing well, so um don't kill the live stream numbers? Okay, because there's plenty, but i'm gon na, say this a few times today. These are available on the website.

Now, okay, we got the cuffed and we got the non-cuffed. I know everybody's been asking they're on there, okay check them out, but don't kill. My live stream numbers, there's gon na be plenty, you don't need to leave the stream come on all right, but i appreciate it. I haven't announced it anywhere else, so i take that back.

I did announce it on instagram, but i have a very small following on there, so you guys in the stream are gon na be fine um. I haven't announced it on youtube. Like per se, you know like a youtube post or i haven't, announced it um on facebook or anything yet. So just keep that in mind.

You guys have plenty of time, there's still plenty of them anyways. I ordered like 400 beanies, so they're not gon na sell out. I don't think i don't i don't know well, who knows what you guys will do so really really appreciate you guys making it in here tonight all right, i'm gon na start this off. I try to do this every once in a while uh it's been a while um, you don't get a discount code, adam see, friends and family, get nothing with me.

Friends and family pay full price, in fact, friends and family. I'm gon na i'm gon na add on a little bit of extra money there for friends and family. So you know, because i'm that's the kind of friend that i am so you know um so uh, i'm gon na start this off. You know i try to do this every once in a while.

I haven't done it in a while, but uh. My name is chris okay for the new people that coming in here right now, uh you may stumble across this or you may have just seen my street or my videos or something like that subscribe to the channel. I started making these videos as a training aide to my own employees and it very quickly after the second video i decided to make them public and it turned into this machine. Okay, i make these hey connor.

Thank you so very much for that super chat man. I really appreciate it um, so uh. I try to make these videos to kind of share the mistakes that i make. I've sure made a lot of mistakes over my career and i continue to make them every day.

Okay, the whole point of these live streams is simply just to kind of discuss the videos consolidate the questions and try to answer them in one place: okay, to try to save my sanity and give my my family some time because uh this has certainly grown to The size that it really has become a second job for me and um. It's really easy for me to become obsessed with the comments. So i've tried to dedicate monday nights to kind of really sit down and give some time - and you know, answer questions and that kind of stuff. So i really really appreciate you guys making it here: okay, um, yeah yeah, the beanies are one size fits all so and i have a big head.

So this i have a giant head, so this fits me pretty well. This is the cuffed version, obviously, and then, like i said, we have the non-cuffed version too so um as usual. If you guys have questions in the chat, please put the questions in caps lock. I will also go through.

I have a list of questions that i consolidated from emails and different things like that, and i'm going to go ahead and talk about them. What's really cool about doing these live streams? Is it gives me the ability to answer these questions and, like i said, consolidate them, because i had several questions about certain topics and we're going to answer them inside here? Okay, and if i didn't already say this, please type your questions in caps, lock, okay, it helps us to kind of field the questions, so we can see them in a little bit better. Okay, let me see actually ike the server wasn't the first to know, because i announced it on instagram the moment that i uh posted them so yeah and then a few people in the uh. The live chat when i first came in here earlier got a little up and up heads up there um, you know so all right uh.

Let me see i'm doing good randy. Thank you very much. Okay. Um.

Let me see right on. Thank you very much for making it over here. Nick, it's awesome bud says it's his first time on the stream justin perry. Thank you so very much for that super chat.

I'm going gon na address this right now, just like i do every stream, okay, the the the super chats, the patreon um subscribers, the youtube channel members. I really really do appreciate that terry. Thank you. So very much i'll address that in just a second, the super chats and the channel support is awesome.

It's not required i'm going to continue to make these videos and do these live streams, guys, no matter what okay, the easiest way to support the channel is simply just watch the video all the way through leave me a comment. Give me a thumbs up. Give me a thumbs down whatever you see: okay, finishing the video watching the whole thing. That really does help the youtube numbers and it just really helps out the channel in general.

Okay, if you guys find something that i made in a video of interesting uh, please share it share it with your friends share with your colleagues just growing the the awareness for these videos and also by people watching my videos. I try to turn them on to my friends, videos and different things like that. Okay, so if you watch till the end, you see, i recommend other people's videos, that kind of stuff. So that's the easiest way to support.

If you guys choose to do so, you can also become a patreon member, a youtube channel member. You can super chat all that stuff, but you don't have to do that. Okay also, i already said it, but if you guys are interested you can go to my website. I have shirts, i just restocked all the hats, i'm going to have this new shirt designed soon.

This is going to be called my flag shirt. I dig this one because we've got the american flag on the shoulder. This will be coming out soon, but this one won't be here for a couple weeks and the same thing with the hoodie. The hoodie will be coming out in a couple weeks too um.

I see a bunch of super chats coming in you guys are awesome: okay, justin, i said thank you um and then terry. Thank you. So very much man um. You need a payment plan for the beanies, i'm sorry, but the beanies are 20 bucks.

So all right um what else we got in here and that includes shipping too, unless you're in canada, sorry guys in canada, i have to charge extra because they charge me a bunch of money to ship stuff over the border. Uh appreciate it there adam you're, awesome. Okay, we're going to get to the normal stuff here now that we covered that up or covered the beanie thing um. I do want to announce make sure that if you guys don't already follow my instagram, please follow it.

There's going to be an opportunity, i'm going to do it just on instagram, there's going to be an opportunity to win a set of the wireless field, piece large, pipe clamps, the the job link, pipe clamps that i showed, but the big giant ones for from three Quarters all the way up to four and eight so for the heavy industrial commercial guys. These will be awesome for you, um i haven't announced anything. Yet it's not gon na be you're, not gon na have to jump through a bunch of hoops and all that crap. Okay, it's going to be a super, easy giveaway.

I am going to do it solely on instagram, so just pay attention um i'll, announce that soon uh and uh. We will be shipping those um worldwide, permitting that it is legal for us to do so wherever you live. Okay and we're not going to play the game if we find out that we can't do a giveaway in your country, because there is some weird countries like that, then i'm sorry - and you know we'll just have to draw another winner, but we are going to make It open worldwide and we'll ship the the the one set of the wireless job link large pipe clamps anywhere in the world. Okay, so that'll be coming soon, but that will be only on instagram, so make sure if you guys don't already check out and follow the instagram.

Okay, um and it'll come up soon, i'll i'll, make it public and everything all right um. I do want to cover one thing so on the last live stream. Somehow i got caught up in the chat and um a bunch of people started talking about. I think someone had asked a question about alternative refrigerants and then a bunch of people started talking about blue on for some reason, and then it got real negative and my understanding as best as i can tell in talking to the moderators and my friends and people That were in the chat was that blue on was not even actually in the chat, and i think i got a little irritated at blue on.

I don't think i said anything bad, but i think i had said some stuff, but i apologize because they were not in the chat so blue on. I don't know if you guys watch this stuff, but if you are in here i apologize my understanding. You guys actually weren't in the chat, so it is what it is. I do have to be honest and open about that.

Okay, um keep in mind that when you guys are having conversations in the chat - and i know that's what the youtube chats are about - people can always have like different conversations and that's cool. I don't mind it, but it's really easy for me to get caught up in it because i look down and someone says blue on and then 10 seconds later 50 chats go by and someone else says blue one's here and then it's like wait. What's going on, you know partially my fault, i shouldn't jump on a bandwagon when someone said something about blue on, but it is what it is: okay, um uh, let's see the other announcement i have is uh. I'm currently working on i'm gon na be doing a walk-in cooler installation coming up wednesday morning wednesday morning, i'm going to be changing out, walking cooler equipment at a very old restaurant that had a an operating r12 condensing unit.

Still one of my only operating r12 units just recently the unit had a refrigerant leak and we had to convert it over to 409a. So we talked the customer into replacing all the equipment, so we're going to be doing a condensing unit and an evaporative coil and a line set converting it to 448a. A total system retrofit i'm going to take this opportunity for my very first time to go ahead and try out the zoom lock max. The press.

Connect fittings from sporelin they've been asking me to try them out for a long time, and i just never really found the opportunity. But i think this is going to be the perfect time to go ahead and give it a shot and see how it works and everything so stay tuned for that i'm gon na be making a video on it, showing it and all that good stuff. Okay, um pretty interesting. I've been doing a lot of research and stuff and uh.

So this should be a pretty cool one and i usually don't do installation videos. So this one will be a little different too, because i usually don't show those it's a little bit harder for me to show installation videos and in fact this is going to cover a question that i had right now. The reason why i don't show installation videos for the most part is because i usually have all my employees with me. I get a lot of questions.

Why don't? I show my employees in my videos? Well, it's just a weird conflict of interest. Um, you know showing employees in the videos. The videos are monetized, you just yeah. You don't want to have to worry about that kind of stuff.

So i always think of the whole big picture thing right and worst case scenario um. So it's just best for me. Not to show my employees just so that way, there's no weird thing like six months, two years down the line, someone says: hey, you've got a video up and i don't want to be in that anymore. So it's just easier for me to avoid all those headaches and not show employees in videos, so that's the main reason why okay plus it's for their privacy and stuff, and all that good jazz.

Okay, all right! Let me see what else we got going on in here. I know i'm missing a lot of stuff um. Why was that refrigerant even used? Was there nothing better uh? Let's see, i don't know what that that was. Why was what refrigerant used? I don't know what you mean by that um.

Do i have any live job site? Oh, live streams! No! Not at this time the live streams on the job sites are a little bit difficult, so um. Let me see what i'm missing in here: uh stop making chris's insta post go into his discord. Okay, all right! All right! Let's see what else we got um, how do you get the merch to ship to your house? Jake? I don't know, but how often is it that i have issues with things that other trades do um? You know it's it's common that when you're on job sites, especially on new construction, where you run into issues with other trades and stuff for the most part in the restaurants, i don't really have issues where i have to get other trades involved too much. As far as other trades causing issues - i don't, i rarely ever have that issue, but i mean you know every once in a while i'll do a walk-in cooler replacement with some heat craft equipment and they require a dedicated circuit for the evaporative coil.

So i'm going to have to get an electrician involved to come and do that every once in a blue moon. If i'm doing multiple package unit replacements on the roof and there's just a lot of work to be done, i might call in a plumber to go ahead and do all the gas pipe for the most part. If it's one or two units, i usually just do the gas pipe by myself, but you know just depending on the size of the job. You know you might want to get mechanical trades involved to come in and do gas pipe or things like that, or even if you have to have gas, pipe, moved or different stuff like that, it's pretty often that i have to have roofers come out after i'm Done doing equipment, replacements and stuff like that just to shore up any you know holes or anything like that that i've made on the roof, but for the most part you know, don't really have to get other trades involved.

I kind of handle most of it on my own. You know, unless, like breakers, need to be replaced and stuff like that, so all right, i'm going to get to um. Let me see what we got in here, so i want to go ahead and cover this right off the bat, because i know that this is the time when we're going to be running into these issues a lot more and i'm going to go ahead and lump In a couple questions together in this one, so one of the questions that i had this week is: what's the purpose of a liquid line: receiver, okay, so a liquid line receiver in a refrigeration system that has an expansion valve is simply a storage device. Okay, an expansion valve is going to vary the refrigerant flow into the evaporator coil, depending on the load of the evaporative coil okay.

So it's going to open and close the valve depending on the load or the heat gain or the i'm sorry, the amount of heat. The evaporator is absorbing from the space okay, so when that happens, the expansion valve might open up and push more refrigerant into the evaporative coil right and then at other times, when there's a very low load on the box, the evaporator coil might not need as much Refrigerant, so the expansion valve is going to slow down the flow okay or it's going to reduce the flow and you're going to have extra refrigerant in the system, because our system, you know it, has a set amount of refrigerant in it. Now, when that happens, when that happens, the receiver, okay, we'll start to the refrigerant, will start to back up into the receiver, even though the system's still flowing okay, this the refrigerant's still flowing through the system, but it just doesn't need all the refrigerant okay uh, because The expansion valve might open and close all right. I have a cut away of an expansion valve right here: okay and the expansion valve is going to open and close depending on the load and the refrigerant's gon na.

It's gon na need more refrigerant, less refrigerant. So when it needs less refrigerant, it's gon na store the refrigerant in the liquid line, receiver, okay and then, when it needs more, it's going to take it out of the liquid line. Receiver, all right, but there's some other times that the receiver becomes very important, especially if you have a refrigeration system. I see these super chats coming in.

Thank you guys very much um yeah tan. Thank you so very much for that. Super chat and john. Thank you.

So much okay, that's awesome guys! You guys are great, so uh, another time that the the receiver will be a very important device within a refrigeration system is when the box temperatures satisfies. If you have a pump down system, okay, so a pump down system. What it's going to do is you're, typically going to have a liquid line, solenoid valve okay and it's going to have a coil on the top and it's going to shut off the refrigerant flow through the liquid line. Usually, this is before the expansion valve.

Okay, something like that or it might be up on the roof. It depends, but it's going to be on the liquid line. Typically, okay - and this is going to shut off the flow of refrigerant when it does that the system's going to pump down and what it means by pump down is that the refrigerant is going to stop at this valve. And it's not going to go any further.

And it's going to back up in the receiver and the condenser okay, so the receiver has to be sized accordingly. So that way it can have enough storage capacity for the entire system charge to be backed up within the receiver and the condenser. Okay. Now, with the receiver, with the liquid line solenoid valve and with the expansion valve, there's some other functions of that receiver.

Now remember, i told you that it's going to be a storage device, okay on a normally operating system, you're just going to have an expansion valve in there and the expansion valve is going to do whatever it needs to do. Okay. But if you have a system that might be installed in a low ambient condition, okay, you're going to have a low ambient control on the system. You can do that with a couple different methods.

One of the more common ways is to use, fan cycling. What that's going to do is shut off the condenser fan motor drive the head pressure up turn it back on drive the head pressure down, it's kind of a vicious violent cycle with a fan cycle control, especially if you have a single condenser fan motor. Okay, i'm not a fan of fan cycling, because if you have a fan cycle system, just watch it next time the fan shuts off watch what your sight glass does and then watch what happens right when the fan turns back on. Watch your sight glass.

It's going to fill up and drain fill up and drain fill up and drain, and it's just really violent in the system, one of the more common ways that we will control the system's head pressure is by a head mat or a head pressure control valve. Okay. It's a low ambient control and what it does. Let me grab one what the head pressure control valve is going to do.

This is a cutaway of a head pressure control valve okay. This is a brand new one that hasn't been cut yet all right. This is going to be installed in the system on the high side between the condenser, the receiver and the discharge line. There's actually going to be a t in the system, and this is actually going to back up the refrigerant into the condenser.

Okay and it's going to simulate you blocking off the condenser with a piece of cardboard: that's the easiest way to explain what a head pressure control valve is going to do. Okay, there's a little bit more science into it, but essentially it's like blocking off the condenser, but not all the way. Only a little bit to drive up the head pressure right and it's just gon na slowly maintain the head pressure at whatever the bypass pressure, usually plus or minus five to ten percent um. This particular head pressure, control, valve's, bypass pressure, is 210 psi and it's usually stamped on the side of the valve with a sticker, and let's see if i can show you guys that there you go.

This is an lac valve by sporlen, it's an lac4 210. So what that means is approximately at 210 psi. This is going to start to flood the condenser and shut off the flow of refrigerant coming out of the condenser. It's going to slow it down, essentially, okay.

So the reason why we do that is because we're trying to maintain a certain pressure differential across our expansion valve okay. So, let's think about it this way. This is the easiest way to explain this and for those that watch these live streams. You probably heard this a million times, but you know what it's okay, because a lot of people don't understand the head pressure control valve, so this expansion valve needs refrigerant flowing at a certain velocity for it to be able to meter properly.

Okay, that's the easiest way. There's a little more science to it if it's not flowing at the right flow rate or velocity whatever you want to call it through the system, then this can't properly control the superheat okay, we control that by maintaining a pressure differential. What we mean is you need to have a set pressure on the high side and you need to have a difference between the high and the low or the refrigerant pressure coming out of this expansion valve the evaporator suction pressure. Okay, if you don't have that there's a problem, so we put this head pressure control valve on the system: okay, the lac valve or there's a couple different other ones, there's lo or oroa valves, and then there's hold back valves a couple different ones, but um we Put this on there, and this is going to maintain the head pressure in the system now, one of the tricky things about having a head pressure control valve is.

This is the trickiest thing, and this is this time of year. We're getting a lot of these service. Calls where they call you and they say: hey, my walk-in cooler doesn't work in the morning, but in the afternoon it works. Fine, okay, what's happening is the system might be low on refrigerant and if it's low on refrigerant this head pressure control valve right here is going to bypass and there's not going to be enough refrigerant stored in the receiver and then what's going to happen, is the Liquid level is going to drop below the dip tube right, so it's just going to be vapor getting fed down to the expansion valve this expansion valve.

I don't care if you have an air conditioner refrigerator any of those you need a hundred percent liquid. Going to this expansion valve for it to work right: okay, now, um! If you don't have a hundred percent liquid going to that expansion valve it's going to starve, the coil you're gon na have issues all right, so we need to properly charge the head pressure. Control valve operated systems, okay, the best way to do that if you're dealing with a tube and fin coil, meaning a copper tube and just normal fins on the on the condenser coil, is to look up a tech bulletin by spoiling 90-30-1. If all you need to do is just google spoilin 90-30-1 and it's going to explain how to properly calculate the flooded charge for a system that has a head pressure control valve.

Okay, essentially, what it's going to do is you're going to calculate the amount of storage capacity that is inside your condenser, and it's not really going to calculate inside your receiver. But it's going to calculate the amount of storage capacity and the extra refrigerant you need in the condenser to properly flood the condenser, and you know for the valve to work properly now. The 90-30-1 method will not work on a micro-channel, condenser coil. Okay.

Now i've also said many times in my videos: it's it's difficult. Sometimes there's some weird circumstances where calculating the flooded charge out in the field isn't necessarily very convenient. Okay, so there's a couple different things: you need to have basic refrigeration knowledge. You need to understand how systems operate okay, but with that being said, you can add the maximum amount of refrigerant the system could possibly need.

Okay, that's one method. The other method is just simply call the manufacturer of the equipment. Uh, coldzone and russell are both very good at publishing the data of how much refrigerant their systems take to properly flood the condenser. So if you're ever working on a cold zone or a russell condensing unit, just call russell and ask them say: hey, i'm working on this model number.

Can you tell me how much refrigerant i need to add for the flooded charge and they'll tell you it's really easy now, if you can't get a hold of the manufacturer? Okay, like i said you can go ahead and add the maximum amount of refrigerant. Now keep in mind, if you add the maximum amount of refrigerant that that system can possibly take you're, probably going to overcharge it a little bit, as i mean you're, going to put too much refrigerant in the system. But it's not necessarily overcharged as it's going to shut off on head pressure. It's just it's got more refrigerant than it really needs okay, but again, sometimes that might be more convenient and cost effective to do it.

That way, there's some field methods to calculate the maximum amount of refrigerant in the system uh one of the most common ways, it's a very old school method. I've i've showed it. I've talked about it. Many times is to simply fill the liquid line.

Receiver and condenser, up until with liquid refrigerant until the receiver is three quarters of the way or 80 or 75 percent right in there just basically say three quarters of the way full when it's pumped down okay, what what that means is when this is pumped down When the refrigerant can't leave the the receiver anymore and you check the liquid level, it's at the three-quarter mark, you know that you can't put any more refrigerant in that system. Okay, but you need to be very careful because checking the liquid level in a pumped down receiver is kind of tricky. Okay. I've, given some methods on how to do that again.

The best way lean on spoiling 90-30-1 method talk to the manufacturer. If you're in the field, you can also the easiest way is go to the system on the coldest day of the year and clear the sight glass, that's the easiest way on the coldest day of the year clear, the sight glass - and you know that you won't Need any more refrigerant, okay, but how often is it that we get to go out to a system on the coldest day of the year? It's not very often it's kind of tricky okay. So, in that situation, what i would do is, i would go ahead and do a pump down on the system. Okay, i would front seat the liquid line service valve or the king valve coming out of the liquid line.

I would wait for the system to shut off on low pressure and then what i would do is take a heat producing device that does not exceed the soft plug temperature. This receiver has a soft plug and right in the top. It's stamped 430 degrees. That means that at 430 degrees this little, it's actually a solder joint - is going to blow out and vent the refrigerant charge.

So you got to make sure that you know where the soft plug is and that you don't overheat. This receiver past the blowout temperature. Okay um, so i'm going to take a heat producing device, i'm not going to tell you, which one but you're going to very carefully make sure that it doesn't exceed that that soft plug temperature or the pressure. You know the the maximum temperature of the receiver and you're going to slowly heat up the receiver while it's pumped down and then what you do.

Is you take your fingers and you run it up here and all of a sudden it's going to get really hot and that's going to be the liquid level. The liquid is going to be right there and the vapor is the point at which it gets hot. So that's how you can feel where the liquid level is now i've shown in my videos, where i take a thermal imaging camera. You can do it with a thermal imaging camera too, but the easiest way is is just simply take a heat producing device that doesn't exceed the soft plug or the blowout temperature of the receiver.

Slowly heat, it up, run your fingers up and feel the the heat point: okay, where it gets really hot and then, if it's not at three quarters, then simply add a little more refrigerant until you get up to the three-quarters mark but understand something. If we go and we calculate the flooded charge, let's say on that same system that we filled up the receiver to three quarters of the way. If we calculate the flooded charge, the actual amount of refrigerant it might need to properly flood that condenser might only be half a receiver. So, depending on the size of the receiver going between half and three quarters, you might add 20, 30 or even hundreds of pounds of refrigerant.

So you got to be smart about what you're doing. Okay, i'm dealing with small systems maximum charge 14 pounds. If i have to add an extra four pounds to the system, it's not a big deal. Okay, but when you get into the big stuff, you really need to start thinking about.

Okay, i need to properly calculate this now. The next thing i can tell you is, if you ever, do get a hold of the manufacturer and find out the proper flooded charge. That's the easiest way right, pump the system down and mark the liquid level with a paint marker and say factory charge. Half a receiver, so then, from that point forward, everybody knows that the correct amount of refrigerant to properly flood that condenser is here.

Okay, now another thing to understand too again, i kind of preface this by talking about understanding the basic refrigeration cycle. Okay, just because the manufacturer says that that condensed unit can hold 14 pounds of refrigerant doesn't necessarily mean that's the full charge. Okay, you need to be able to evaluate things. What happens if the maximum charge of the system is 14 pounds, but the liquid line is 200 feet long and they ran an oversized liquid line.

So theoretically, the system might take more refrigerant than that. Okay, so you have to be able to evaluate that stuff and know what you're doing? Okay, you can't just it's just not cookie cutter in this business. Okay, now head pressure control valves, because i know there's going to be a lot of comments and i know i haven't paying attention to the chat right now. I know there's going to be a lot of questions about these head pressure control valves, but you will see these on refrigeration systems.

You will see these on ice machine systems. You will see these on data room air conditioners. You will see these on built up air conditioners. For the most part, you will not see a head pressure control valve on a residential air conditioning system unless it's like a big old fancy, one for the most part, you're not going to see a liquid line receiver on a residential air conditioner.

But i will tell you that residential air conditioning systems condensers are typically sized, so that way they can store the extra needed refrigerant for when the expansion valves open and close okay, so those are a little bit more engineered. You know special and stuff all right, i'm gon na set this down, and now that i went off on a big old tangent about that i'll pay attention to the chat. Okay, for those that are just coming in here too right now, i'm gon na go ahead and catch up on the chat, real quick while it's been going for a while alex. Thank you so very much for that super chat.

If i didn't already adjust it, oh wow natra. Thank you so very much for that uh that super chat holy moly bud. That's amazing! Thank you. Wow buy a nippex, cobra aka hammer i'll.

Definitely look into that feel free to send me an email, hvacr videos. Gmail.Com. Thank you so very much. That is an amazing super chat.

Uh for those that are just coming in. You see me wearing this new beanie. The beanies are available on my website hvacrvideos.com i have the cuffed and the non-cuffed version. Okay, all right, let me see what we got going on in here: holy moly um.

That is an amazing super chat. Thank you, so very much all right. What was the issue on the loud sounding walk-in freezer on the hybrid freezer, video uh? Honestly, i never dug into that anymore uh, that's one of those things where it was a late night and then even when i went back, i don't think it was making the loud noise or something so i didn't dig into that anymore. So that may be a to be determined in the future video all right.

Do i work on rtus with energy recovery systems, hvacr novice. It has been a long time since i've seen any energy recovery system. So there's a couple different methods of energy recovery that i know of so old-school energy recovery units. We might have called them heat harvesters and what they would do is they would recover or they would preheat the water before it went to the water heater.

So basically, you'd have the domestic water coming into the restaurant. They would install these heat harvesters essentially on the outside, and they would grab the discharge line coming out of the compressor. They would re-pipe it out to the heat harvester and they would have these on every air conditioner and they would try to grab the heat out of the condenser, essentially sub cooling, it kind of in a way and uh, basically trying to conserve energy. Now, in the 80s and 90s there was a lot of energy recovery stuff and then a lot of it got bypassed.

Okay, we don't see it very much anymore, because our systems, you can't really add things onto it like that right in the 80s, especially the 80s. The late 80s, they were kind of coming out with a lot of energy management systems and then those heat harvesters for the water and stuff. Like that but see you couldn't just throw something like that on an air conditioner these days, because they are specifically engineered. The air conditioning systems - and if you change things you know it messes everything up.

So you need to be really careful on that old equipment from the 80s. It was um. You know eight to tens here, maybe even six here, so they had a lot of room for fudging around and stuff in there um. As far as energy recovery on the systems too, there was an interesting question that someone had brought up about something we were talking about on the overtime show.

If you guys don't know, i'm involved with the hvac overtime channel, we do live streams on friday evenings, usually around 605 pm pacific time, and it's myself feel free to post hvacr overtime link in the chat guys. But we usually cover all kinds of cool topics and stuff, it's kind of like a live stream, but more of a hangout where we all talk about things all right, um. So there's some other energy recovery things you can uh there's like ervs um. You know uh heat recovery, wheels and different things like that that try to pull humidity out of the air and different things like that or try to um uh recycle heat before it discharges it out, there's all kinds of different methods.

I really don't work with them. Very often, no so um all right. Let me get down to here. How often do i calibrate my equipment, s-man gauges meters, just hvac, so typically i will check and verify calibration for the most part.

I don't have any problems with my job link probes. I will always compare them to a known source, as far as i know, there's not really any calibration of the job link probes themselves, but i will always compare them to a known source. I'll usually find some calibrated thermometers verify that they're good accurate and then compare the the other probes and different things to them. As far as the s-man gauges, there's really not much calibration that i've ever had to do, but i am always comparing my refrigerant gauges and any tools to other known sources that i know are working just to verify all right.

Let's see what else we got in here, a heat wheel, yeah heat wheels, one of them an erv um all right. So i did that. I answered that question. How many uh do i install mini systems with semi-hermetic compressors? I can tell you that i probably the last time i installed the semi-hermetic condensing unit was probably 18 19 years ago.

It's been a long time. I can picture yeah. I can picture it in my head. The restaurant doesn't exist anymore, it was a crabby.

Bob's was the name of it um. It was like a seafood chain that didn't last very long. We were changing a walk-in condensing unit. I think, and we installed a semi-hermetic condensing unit on the roof.

That was the last time i installed something semi-hermetic, i don't work on the big stuff, mostly everything we install these days is scrolls all right. Let me see what else we got in here. Where do you order a beanie go to hvacrvideos.com um how's it going. How was my day my day was all right, so today uh i had a meeting.

I've got a job coming up, it's not really something i can film. I don't think because of the location, but i've got a job coming up where i have to lift, or i have someone else - lifting a 15 ton air handler for a 15 ton split system, we're replacing the entire air handler. It's a fan coil. So it's a heat pump system so we're replacing the entire fan coil unit.

I think the fan coil itself weighs just under 800 pounds a little right in the 750 range or something like that. So i got a construction company involved, so i had to do a site walk with the construction company today. So that way we can coordinate everything uh conveniently the restaurant is shut down because of the virus crap, so we're gon na be able to do it during the day. It doesn't have to be night work so yeah, i guess, there's a silver lining there do.

I do any cascade refrigerant. No, i don't uh how okay all right um did i go to the university of california riverside. No, i went to trade school. I went to mount san antonio community college mount sac in walnut california uh.

I went through the hvac program. I think i mentioned this recently, but i am two classes: shy of getting a certificate and air conditioning and refrigeration. I think i need to take a welding class and a technical math class, so i need to go get that done one of these days, but i don't have any other degrees. I i tried going to college after high school, but that wasn't for me i'm more of a knuckle buster like to fix things: i'm not a smart re, refined, sophisticated book person.

How does evaporator size affect the refrigerant charge needed um? Well, i mean the entire system and you know what i'm going to cover that right now, because i had a question about this. So let me cover this question that i have on my list. Let me find it kenny had asked me about walking cooler sizing and how to properly size, equipment and i'll kind of tie. Your question into that a little bit so um kenny's question was: you know he was kind of curious about when he's sizing an evaporative, coil and a condensing unit.

He didn't know like hey, should he oversize the condensing unit? Should he under oversize the evaporator? What's the best bet? Okay, so this is a really easy one. Uh internet pirate. Thank you so very much for that super chat. Don't let me forget.

I will answer that. Okay and i i do have a nate certification and i will cover that. Okay, so i'm going to leave your question up there right now, all right so as far as sizing walking cooler, let's just basic, walk in cooler. Okay, first off, you have to understand that every decision you make with sizing a walk-in cooler is going to have a ramification of some sort.

Okay, so um. It was very common for us to oversize condensing units in the past and the reason why we oversized condensed units uh at least the reason why i used to oversize condensed units was because, whenever i would install them, they wouldn't operate properly in high heat and or They wouldn't have big enough receivers on them to store the refrigerant, now, keep in mind we're dealing with small refrigeration systems. Okay, when you're dealing with big heavy industrial and stuff like that, you can hand pick all the different components you want in your system, but i'm buying a pre-made condensing unit, okay. So, in the late 90s to mid 2000s, it was very common that everything was kind of sized for r22 and kind of tailing out on r12.

Okay, r12 was kind of in the past, but they were still sizing condensing units for r22. Well, we had new refrigerants out 404 and different things like that. So what they would do is they would take a 404 compressor with polyester oil. They would make sure that the condenser was properly sized and then oftentimes.

They just throw a receiver on there and there wouldn't be enough storage capacity within that to properly charge the system. So what we would run into is you wouldn't be able to pump the system down at the liquid line receiver and different things like that, so we started oversizing our condensing units. Now, that's when i started to realize the ramifications of oversizing a condensing unit. Okay.

So when you're going through hvac school right or when you're reading a book, commercial refrigeration for air conditioning technicians by dick worse, i highly suggest that book, if you guys, haven't already check it out. Okay, there's a link in the show notes of this video all right. So when you are uh working on a system, you learn about evaporator td, okay, and you learn about how to um understand before you put your gauges on there, what your pressure should be. Okay, i can tell you that on a walk-in cooler right, i can tell you right now before i go up to it, depending on how it's sized, i can tell you exactly what the refrigerant pressure should be, and it's really easy.

Okay, there's some basic formulas. You take your uh box temperature right, the space temperature minus the evaporator td, and you convert that via a pressure temperature chart like i have right over here, okay and you can find out what pressure the system should be. So if, if i have a 40 degree space temperature inside my walk-in cooler and my evaporator was designed with a 10 degree, evaporator td, then it's safe to say that my suction saturation temperature should be about 30 degrees. It's a really simple mathematical calculation.

If i know my suction saturation, temperature should be about 30 degrees. I can convert that to a pressure and i could tell you that at 40 degrees, my suction pressure in my evaporator should be approximately this okay same thing on the roof. If i know that my condenser was designed with a 30 degree td, condensing temp over ambient, then i could say it's 100 degrees outside my condensing temperature, my suction or my liquid saturation temperature inside my condenser should be about 130 degrees. I can convert that and tell you what my pressure should be now, let's get in here and change this condensing unit, and you know what, because i'm going in there and it's an older one, i'm going to put a bigger condensing unit on it because it'll be Okay right, what i just did was, i just changed the td of the system.

Okay, once you change the td or once you change the design spec, then everything is kind of skewed. Now you can still make it work to a certain extent. Okay, but if you do not properly size an evaporator and you do not properly size a condenser, your evaporator td is gon na, be changed, and that is gon na skew some things. Okay, it's always best to lean on someone to design your equipment for you, especially if you have critical situations like, for instance, um.

I did a service call i'd, say four or five years ago, where i got called out to a bakery. It was a brand new place that was just built. They made wedding, cakes at it and they had a general contractor install all the equipment. He had a guy, oh yeah, the general contractor called me out, he's like i have a guy.

He did all the work. He's he's a he's, a reefer guy. He knows what he's doing. It was convenient, though, that the reefer guy right, his guy, was out of town.

When i had to go troubleshoot their problem and what had happened was he didn't size, his equipment right? They didn't have it properly calculated to maintain the proper humidity levels inside that box. Okay, your evaporator td is going to change the humidity levels inside the box. Let's say you have a produce walk-in, you don't want to dry out the produce, because then it's going to go bad, the same thing with the bakery, the the problem with the bakery was they were. They were drying out the cakes, okay, so um we had to go in there and basically tell them hey you designed all this equipment wrong.

Let's go ahead and let me redesign it. You can change the equipment and he's like. Oh no, no, no! No! You know i'll put a humidifier, it was all kinds of weird crap and i said all right cool here's, the bill. You go and pay my stuff.

You do your thing. I don't even know whatever happened with that, okay, so um. You have to make sure that your equipment is sized properly, so nowadays we have all kinds of energy requirements on our walk-ins and stuff like that, okay, so uh. What i will use is a a calculator software, okay, i'll use a load calculation, software, uh, russell refrigeration, makes one or uh heat transfer products.

Group httpg, i think, is their name, but it's russell refrigeration. Okay, you can use their load calculation, software called rustbox. You can go to their website and find it download it. You can input some things and the cool thing you can kind of cheat a little bit and you can use other manufacturer's softwares to kind of size, your equipment too, so you can do that.

But with that being said, you want to match your equipment as close as possible: okay um. So if i have a condensing unit that puts out you know, 80 000 btus at 100 degree ambient right, that's another thing you have to understand too. Is you need to size that condenser for the proper ambient temperatures? Okay? So you know whatever? That? Is you want to make sure that your evaporator can can deliver the same capacity? Okay at the box temperature that you need so try to get those numbers absolutely? As close as possible and understand that, if you change things like in some situations, you might have to oversize your evaporator, but you definitely don't want to undersize your evaporator unless you're doing some weird engineering crap okay. So there really is a lot that goes into sizing.

Walking cooler equipment, reaching cooler, equipment and different things like that, but you want to try to get the btu the delivered capacities as close as possible. Okay, so um try not to go oversize on your condensed unit, but there's some situations where i'll tell you. Even to this day i might go install a new walk-in condenser out in the desert, where it gets to 120 125 degrees, and i'm gon na be oversizing. That condensing unit - yes, my evaporator td, is gon na suffer a little bit, but that's just how it's gon na be okay, so um.

I know i went off on a major tangent there. Hopefully i kind of answered your question uh internet pirate. You had asked me: do i recommend nate certification and what do i need to get it? Okay. First, let's cover this.

I am a fan of any certification out there that you can possibly get okay. Now, each certification out there has a different issue. Okay, you become nate certified. You become married to the fact that you're gon na have to pay a subscription fee.

Every two or three years and you're gon na have to keep going to school. To maintain that certification, you get an esko certification, something similar. You get an rscs certification, something similar okay, but any certification is better than no certification. I choose to have a nate certification.

I have a couple different ones. I have light commercial refrigeration, i have heat pump, installation and service and i don't know if i have gas heat or not. I don't know but um, but i choose to do that and the reason why i choose to do it and why. I think any certification is better than none is because to maintain all of those industry certifications.

You have to continue your education and what i mean by that is, you have to show and prove to them, that you're still going to school, okay or you're still taking classes training classes. So whenever you take a training class in the industry, whenever you go to them, you say: hey: do you give nate certification credits and they say yeah give me your nate id number and then they send some stuff to nate and then nate says hey. You took this class here's you know 10 of your credits that are needed for whatever right. So it's very important.

Any certification, in my opinion, is better than none okay now, but you have to understand that nate is a business. Nate is out there to make money. Okay, yes, they they try to maintain certifications but they're, a business. Okay, they're there to make money so understand, there's a give and take there.

But it's just you know i don't mind paying the fee every couple years now. Ironically, i keep saying this - i haven't looked into it yet, but my nate certification is actually going to expire because i don't have uh all the needed uh credits and i believe it expires here and actually anytime. Now i probably need to look it up. I think it's in november sometime, but i don't have all the needed credits.

I didn't get them this year because of the whole covet thing. I haven't been taking training classes. So, oh i don't know i might have to redo my whole nate certification or something like that. Maybe they'll give me something.

Yeah i get a little bit of the coke. No, it's not too bad, though the hot tea is helping me man, i don't know about you guys, but the coveted weight is catching up with me. Um, i i know there's a lot of stuff that is passing by in the chat. Hey.

Do me a favor guys smash the like button uh. I currently see 180 likes and 443 people watching right now. So please, please, please smash that like button, let's get it up to the 400 range. I tell you what you guys get the likes up to the 400 range, whatever you guys got to do and i'll give away a beanie on the show right now to the to the chat so get get that get that like count all the way up to 400 or more, and i will give away a beanie on the stream, do whatever you guys got to do to get that up.

Okay, all right! Uh, let's see what else um sefsa is awesome as well. Yes, sefsa is another one too sefsa, i have to say they're pretty intense, just like the rscs cm exam. If you get the cm exam, you know you're crap. I failed the rscs cm exam two times, but to give it credit, i never studied once um not trying to flex or brag, but nate is designed for technicians that have been in the industry for so many years to be able to pass the test without even Trying, okay um, it's a great thing and it continues your education, but the rscs cm exam is no joke.

There's that's! I i've never studied for the nate test, but the rscscm one that got my ass handed to me two times so uh. I would love to get sefsa, but it's a quite expensive certification, but i mean it. You really do know your stuff, so um all right. Let's see what else we got in here um.

Let me see all right uh. Let me get to my list of things to talk about here um. I already talked about walking cooler sizing, okay, um. Oh this is a great question um and i will address the questions i see in the chat here in a minute.

Remember smash that, like button get it get the light count up. I think i see 280, something or other right now so keep smashing it get it above 400 and i'll give away a beanie um all right. So the question that i have on my list right here was uh jimmy had asked a question, and this is a really good one. So jimmy asked me how i stay awake when i'm driving, so he says that he regularly gets sleepy and wants to not um nod off when he's driving down the road.

Okay. So, first and foremost, i am not the poster child for being healthy or doing things proper uh. I make a lot of mistakes. I don't have a good diet, but the best thing i can tell you right now is change your diet.

Okay, first off stop drinking soda soda's. The number one thing i cut soda out many years ago so does one of the worst things you can drink, stop drinking energy drinks, red bulls and different things like that. Okay, those do not help you because they just allow you to crash; they don't help you they. It just leads to diabetes and all things like that.

Okay, so cut that stuff out now. The reason why i say is i'm not a poster child is because i drink coffee every morning. Coffee is a stimulant too. You really shouldn't be drinking coffee, but it is what it is.

There's some things i can't give up.