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? I hope that you guys are doing well. Let me make sure that i get my fan set right.

That's too low, that's too high and that's just right just like what goldilocks wanted um. I have a fan that i use right here. It helps to keep me cool because my air conditioning system sucks in my house, um. You think i would know someone that could fix that, but you know one of these days we'll get to it but uh.

I have a fan that i have like blowing air on me, but at the same time it creates white noise because this microphone will pick up a conversation across my house. I have to set the game way down to try to not do that, but this white noise really helps that. So i have to make sure that it's set right so that we don't hear people slamming doors and cats meowing and stuff like that. So hopefully you guys are doing well um steven mon montanez.

I don't know if i butchered your name there. You asked what i am drinking tonight tonight. I am drinking uh, pamplemousse lacroix, it's grapefruit, i think, is what it is. I don't know these are my uh.

My vice right here these helped me to stop drinking soda um. I'm sure that there's bad things that will come out about these two, considering that they're all put out by all the soda companies that i don't drink, soda anymore, but now we drink these carbonated. Whatever waters and stuff, but what really helped me to stop drinking soda is not even these flavored ones. I started with uh.

Costco has sparkly like italian sparkling water, it's in like a plastic water bottle, and i started drinking those with just a lime um twist in them, and that really helped me to eliminate the soda, because what i found was, of course i was craving the sugar when I used to drink soda a lot, but it was also the bubbles and flavor in general. So when i started drinking the the the sparkling waters, which essentially is just soda water right um, i just put a twist of lime in there and then that really helped me to get past the the craving for the sodas. And then i slowly went to like the lacroix and things like that and, like i said, i'm sure that there'll be something bad about these lacroix. I try not to uh drink too much when i'm uh alcohol wise.

When i'm on call. You know um, because obviously you got to be ready for these service calls that come in at any given moment so um a couple things i got as usual. I definitely want to get to the chat and cover questions and different things like that. So do me a favor guys if you guys do have questions or things that you want me to cover, definitely put them in caps.

Lock, that's all capital letters in the chat and that'll help me to see them. Okay and remember, there's a lot of stuff going on um. Sometimes i miss stuff, if i do feel free to send me an email to hvacr videos. Gmail.Com.

If i miss your question, you can keep reposting your question and tell myself, or one of the moderators tells you to stop but um. If i miss it feel free to send me an email and we'll try to get it onto the next one too. Okay, so um lots of stuff i want to talk about. I have two very humbling moments that i want to talk about.

That really put me in my place, but first and foremost i do have to um talk about another youtube channel: okay, there's another youtube channel, and forgive me i do not remember the guy's name: okay, um, but uh. The channel is called hvac time. Okay - and it is a great commercial industrial air conditioning channel, you see lots of work on chillers on large air conditioning systems and i really do like the way that the guy covers everything and again, forgive me. I do not know your name and i apologize.

I think i did know it at one time, but i forgot it already, but um it's called hvac time. I'm gon na put a link in the chat right now. You guys definitely want to check it out because it's a great channel and he's been doing a great job um, and you know i got to give him props too. I watch his videos and he always like plugs me in his videos like talking about something he saw in my videos.

That's really cool that someone does that because i, i don't even know the guy, you know, and he watches my videos and talks about my big picture, diagnosis, approach and stuff like that. So that's really cool and it's really nice and please, if you guys, haven't already go subscribe to his channel um great dude, so doing great work on that channel. So um, oh good questions already coming in the chat, so i'm gon na mark these ones. So that way i can get to them um, and i will get to these questions that just came in here in just a minute.

Okay, first and foremost, i want to talk about something, so i want to talk about these two moments that just really humbled me. Okay, the first one was um. When i talked about in my recent video, the video that i just released yesterday, i talked about pulling up to the restaurant and uh, seeing you know, police run in there security run in there and to walk into the restaurant and see as i'm pulling up. You know it's really frustrating, and i said this in my video but i'll cover it here, because maybe some people didn't watch it yet so um i pulled up to a restaurant.

It was an overtime emergency service call. I was frustrated because i had to go to a service call on a saturday. I think it was saturday and um. I pulled up to the restaurant.

It was at a shopping mall, so i'd already gone to the shopping. Mall security got roof clearance and then i pulled up to the restaurant and, as i pulled up a police car literally skid in front of me, the police officer was a female. She was out of that car with her door open before the car even stopped. She was running into the restaurant and i'm like what is going on.

Two employees or an employee ran out and a customer ran out of the restaurant and it looked like they were rubbing their eyes and i was like uh. You know, like all this stuff starts. Rushing through my head what is going on here, i see security coming and i'm like um. What do i do? You know i got ta go into this restaurant and i don't know what's going on and as i'm walking up carrying my tool bag, there's a security officer in front.

I said uh, i got ta go work in there what's going on and then she tells me it's a medical emergency. Okay. So then i walk in the restaurant and i couldn't help. But look i felt bad for even looking, but they had a gentleman on the ground.

They had an aed on him, a defibrillator. They were trying to restart his heart, they were doing compressions and it just really put me in my place and humbled me. Okay, i had two of these moments last week, really really big moments for me, and it just really made me think guys. Okay, so i addressed it in my video um.

I don't think the gentleman made it and i hope that he did, but i don't think he did from what i heard from management and things like that. But i don't know for sure. So i can't confirm that. But it was a very humbling moment to think that life is very short and we need to make the best of it and live our lives um to the fullest for sure.

Okay. So just keep that in mind now i want to share this other experience that i haven't shared with anybody, but my friends and i'm going to be completely honest with everybody. I was driving home. I want to say it was friday.

I think it was friday afternoon. I was driving home from work and i was sitting in really bad traffic. It was really bad um. Even for my area, i was kind of like whoa.

What is going on. You know, and i was getting really frustrated because it's the end of the day. I just want to get home and i had gotten off the freeway because i wanted to get a drink from the gas station. So i pulled into the gas station, got my drink and then pulled out, and i decided i was going to take some side streets home to try to avoid the traffic mess that there was so as i'm driving down the side streets.

I get far enough to where i think hey, i might have passed the traffic now, i'm gon na go ahead and get back on the freeway, so i turned down the street and sure enough. I didn't bypass the traffic i actually pulled. I was trying to get back on the freeway right at the point where they completely had the freeway shut down, and i was like man what luck? I didn't miss the traffic. You know, and it took me a minute to realize what was going on.

I was in ontario california, at the moment and uh. I started seeing police cars fire trucks. I saw people on the side of the freeway and then i realized what it was uh. It was one of the soldiers one of the 13 soldiers that had been killed.

Tragically in afghanistan, and they had just flown him home his his name was lance corporal kareem nikui, and i could be butchering that last name. So i apologize if i am and they were taking him to his resting place, um and that really really put a knot in my stomach, because here i am frustrated that i'm sitting in traffic and i'm frustrated that i'm inconvenienced and that you know i'm not getting Home when i want to get home and this poor kid didn't go home alive, you know he was, he was being transported home and he just really made me think guys. So i had two of those moments last week and it just really puts things into perspective. Makes me really be grateful for everything that i have in my petty problems, because my problems are nothing in comparison to some of the crazy stuff that people have to deal with.

So just keep that in mind guys - and i didn't want to start this on a horrible note, but that one has been really eating at me all week and i just couldn't help but feeling like the biggest idiot, because i was inconvenienced and then when i realized. Why i was inconvenienced boy, did i feel bad about it? You know. So it's just one of those things. Um, definitely a mess, but let's go ahead and get on with the rest of the stream.

Okay, so um mitchell had asked me a question uh in the chat, and he asked a question about the field piece. Wireless probes and he's saying are asking me: are they the right way to go? Okay and what's the best place to purchase them well anywhere? That sells field piece products is going to be a great place to purchase those okay. I really do like the field piece job link system in general. It is amazing, there's two different ways that you can use the job link probes.

You can use them with measure quick or you can use them with the actual field piece app. If you cannot find them at your local supply house, you definitely want to price shop around. I suggest that you buy them locally. If you cannot buy them locally, then you can definitely check out truetechtools.com.

It is a website that sells hvac tools and i actually have an offer code. If you use my offer code big picture, you can save eight percent on your order, as of today it may change tomorrow, but as of today, you get an eight percent discount and if you know for sure check out truetech check out the eight percent discount. If you like them, shoot me over an email, i can generate you an affiliate link. It'll get me a little bit of an extra commission and you still get to use the offer code.

The discount code, all that stuff, so definitely check it out. Okay, um! Let me see what else we have going on in here um. What am i missing? Um yeah, definitely jason johnson said rest in peace to our soldiers and yeah. It was a.

It was a definite um. You know bummer for sure so um. Let me see what else we got going on in this chat right now: okay, um, let's see joe t had asked, what's the most frustrated i have ever been, and how did i deal with it? Um there's been lots of moments that i've been frustrated. Of course it happens, and i'm going to be honest with you majority of the time that you get frustrated in work usually has to do with the way that you're working and the shortcuts that you take a lot of the times.

I create my own frustrations now. There's times that i don't okay, there's very few, you know it's rare, but there's times that it's a customer creating a problem very recently. I i showed it in a video. Actually, it was a walk-in freezer video, where i defrosted a walk-in freezer.

It was on an overtime service call like on a friday night or something maybe sunday night. I don't know, but it was during the weekend and i defrosted a walk-in freezer and i told the manager, i think you guys are leaving the door open. No, no, no! We're not no we're not, and i have it on video. I came back the next morning to follow up on the box and do some more work and i walked in the door, and the door had been left open from what looks like the night before when i was just there defrosting it, and it was just like A big slap in the face because you know i just went through all that work and then here i am again and i got to go through it again and why did i come out yesterday? You know it's one of those things, i'm thankful for the work, but i still am frustrated at times.

Okay, so there's lots of moments that i get frustrated, that's one that comes off the top of my head at the moment, so um and then there was another question in here: um uh, heavy metal guitarist. You said how much product is too much product in a walk-in freezer. Well, of course you need your evaporator to have proper air flow in a perfect world. You want 12 inches about 12 inches of clearance on all sides of the evaporator, underneath it behind it.

On the sides of it, so that way the air can pull underneath the evaporator blow back out of the evaporator, and then you want complete clearance all the way to the other side of the box. That way the air can travel and then come back. You know that's a perfect situation, doesn't always work that way. A lot of times the customers jam stuff all around there.

It hinders airflow adds to the freeze up issues and different things like that, but in a perfect world about 12 inches of clearance around all sides of the evaporator would be perfect. So all right we're going to mark that one off the list talked about that um. Oh, this is a really good question. So jonathan he's actually one of my patreon patrons right.

So he chose to donate to the channel through patreon and jonathan, asked a really good question through patreon, okay. He said why are some refrigerant cylinders or why do some refrigerant cylinders have less refrigerant than other refrigerant cylinders and he was comparing r22 to 410a. If you have a 410a refrigerant cylinder. Typically, it has about 25 pounds.

That's for a 30, a typical 30 pound, normal cylinder of refrigerant will actually only have 25 pounds of refrigerant in it. If you have r22, you will get a true 30 pounds of refrigerant in that cylinder, so he was just kind of curious. Why there's a discrepancy between the different refrigerants and what's the reason for that and the reason for that is based off of the pressure temperature relationship of each one of those refrigerants. Now, i'm going to give you the easiest way to understand this, and this is what i told jonathan the easiest way.

This isn't the scientific reason because 410a has higher pressures than r22. It's gon na have less refrigerant in the cylinder, because you need room for that. Refrigerant to expand okay, now you can get all scientific and talk about the pressure temperature relationship and you know get crazy looking at pressure temperature charts, but essentially you don't want to overfill a cylinder. You always want to have room for expansion when the pressure or when the temperature outside goes up or the temperature of the space at which the refrigerant cylinder is being stored, goes up the temperature around it.

The pressure in that cylinder goes up too, and you have to have room for expansion. You have to have room for that pressure to move, and if you filled that cylinder a hundred percent of the way with refrigerant and sealed it off, you would have a catastrophic explosion of that cylinder, not necessarily a fireball explosion. But the pressure in the cylinder would make the cylinder rupture okay. So that's why we don't want to overfill the cylinders and the same thing goes when we're dealing with recovery, cylinders.

Okay, you never want to overfill recovery cylinders just because you have what we call a 30 pound recovery cylinder in all actuality, the the the um a 30 pound recovery. Cylinder uh only has room for 26 pounds of water in it. Okay, that's the water column is typically 26 pounds. So if that cylinder was filled up all the way with water, it would be 26 pounds.

So we use the term 30 pound refrigerant cylinder. But it's not true. That's more of a nominal number. Okay, so for every different refrigerant, you're going to have a different pressure, temperature relationship and therefore a different amount of refrigerant you can put in that cylinder.

When it comes to recovery cylinders, you want to look at the water column, weight, the tear weight and the refrigerant temperature relationship. Look at your pressure temperature chart to figure out how much refrigerant should be in there now. My buddy brian has a really cool app on the hvac school app. You guys can download it from the app store it's free and he has a recovery, cylinder calculator that will tell you, you input the numbers and it does the math for you and tells you how much refrigerant you can put in there and it's all gon na Change based off of the temperatures at which the cylinder is being stored in okay, so for our standard refrigerant cylinders that you know we just buy from the supply house, they're always going to have different amounts of refrigerant based off of the pressure temperature relationship.

Okay, so hopefully that answers your question: jonathan um, let me cross that one off the list and let me get to the chat and see what we got going on in the chat. I see a lot of stuff going in there, okay um. Let me see uh. Looking forward to your merch tarply's appliance repair, thanks so much for the support, if you guys don't already know if anybody is interested, it sounds like tarpley's appliance repair, possibly purchase something from my website too hvacrvideos.com.

We have hats available shirts available. It's just a cool way to support the channel. I try not to step on the product too much. I try not to mark it up too much.

I just have a you know, a a small little amount that i like to make off of each shirt. Uh, usually i i typically i mean sometimes it differs depending on where it's going, but typically off of each merch item. I just try to make five bucks off of it. Sometimes it might be six bucks depending on some things, but i try not to stomp on everything too much.

It's not really something that you know i want to like get rich off of or anything like that. I just you know. Obviously we got ta break even make a couple bucks past that so that's what we do, but yeah. If you guys, are interested hvacr hvacrvideos.com, you can definitely go to the website.

My wife handles all the merch orders. Actually, there's one sitting right here, um that we need to send out, and then we just sent a bunch out today. So, thank you guys so very much for all the support if you've already done so so all right, let's see what else we got going on in the chat uh. If i missed, if i passed, you guys, questions feel free to repost them guys, i'm seeing a lot, but i just can't get to them all so just keep reposting them and i'll try to get to it.

Okay, um scott asks what are some of the common reasons: leaks, develop; okay, that's a great question and that's actually going to segue into another thing that i want to talk about too there's a bunch of different reasons that leaks develop. In my opinion, the most common reason that i see refrigerant leaks is because of corrosion. Okay, i deal with restaurants and restaurants. We have refrigerators and walk-in coolers where we store lots of products and oftentimes those products are not properly covered and not properly sealed and there's contaminants coming from the products anything that has citrus in it it'll have citric acid in it.

Oranges, lemons, all that stuff right or any uh, salad, dressings that have citric acid in them or vinegars. In them, okay, they will become uh airborne, the the the chemicals or the the citric acid or vinegars become airborne and it attacks the copper and start to deteriorate. The copper, the easiest way to think about that is, if you guys, pull out a penny out of your pocket and look at a penny. A penny is mostly copper right and it has a copper color to it.

Okay, if you didn't already know this, the statue of liberty is made out of copper, okay, but you notice that the statue of liberty is green. Okay, that green color is actually the corrosion attacking the copper and slowly deteriorating the copper. The same thing happens in an evaporator coil is the airborne contaminants attack the copper and typically cause refrigerant leaks. That's one of the most common reasons that i see refrigerant leaks now.

One of the other reasons that we see refrigerant leaks is proper or improper brazing practices. Okay, if you don't properly clean the pipe before you braise it, okay, um. What you typically want to do is you take a piece of copper, you're gon na you're gon na braise it together right. You wan na have that piece of copper cleaned on the inside and the outside.

Now i know a lot of people say you don't need to clean the outside of a joint. Even some people say you don't ever need to clean a joint, just heat it up and it'll be fine, but that is not true. You need to clean the joints. Okay, cleanliness is king when it comes to brazing soldering.

Anything like that. You need to have a clean, i mean even just standard welding. You need to have a clean surface for the process to happen, whether it be brazing using filler metals to bond two pieces of metal together, whether it be actual welding soldering. You always want to have a clean work: surface: okay, so properly cleaning the pipes.

If you're using um silver solder like 56 silver solder, then you need to have a flux. If you're using um like a tin, solder and you're soldering stuff together for like copper pipes for plumbing, then you need to have a flux on that too. Okay, there's really! No need to use a flux if you are using 15 brazing rods, the silfos brazing rods, because the phosphorus in there actually acts as a flux. So there's really no need to add a flux.

To that i know some people love to do that. I don't think it necessarily hurts anything, but i don't, but it's all about cleaning everything. So someone had asked me a question about brazing tips and what i wanted to say about that. He asked me if i had any tips on brazing and cleanliness man clean everything.

Debur, the pipe make sure you get a good fit make sure the pipe fits as far into the joint as possible and then make sure that you're heating and applying the solder properly. Okay, that's the best thing when it comes to brazing and brazing is another common cause of refrigerant leaks, because people aren't brazing properly okay, so you definitely want to clean the work surfaces and make sure that you have a good bond of the two metals using the Filler metal, when you're bracing um, let's see have i seen or used a wireless thermostat that doesn't have thermostat wires. Well, there's always going to be a place where there's going to be thermostat wires. If it's a wireless thermostat, what it's typically going to have, is it's going to have a module somewhere where the thermostat wires connect to the module, and then the module to the actual human interface might be wireless.

Okay, honeywell makes them which is now residio. They have the red link system um. It uses a proprietary communication, whatever it's probably bluetooth, or something like that um. Yes, i have used it it's.

It works in some situations, but if you have a high noise environment as far as like electrical noise and stuff um, it can be a problem using wireless connections, especially if you're using a bluetooth connection. So you want to look at whatever their wireless protocol is. What type of a system it is because if it's like standard bluetooth that they're using then if you use that in a place that has a lot of other bluetooth devices, you could see interference and different things like that, so um, kyle b. Thank you! So very much for that super chat.

Kyle says: is it okay to pull a vacuum on a scroll, compressor, you've heard different things: okay, kyle? What you are referring to is pulling a scroll compressor into a vacuum. While it is running that is not good. Okay, that is very bad, and you do not want to do that, but doing a proper evacuation on the system to dehydrate the system before you put refrigerant in it. That is perfectly fine and safe.

So long as the compressor is not running while that evacuation is happening so there's two things going on there. If you have a system that does a pump down okay, where solenoid valves might close, but the compressor keeps running, you have a low pressure control that turns the compressor off when it gets to a certain pressure. Then, in that situation you want to make sure the pressure control is set appropriately, because you do not want that compressor pulling into a vacuum while it is running okay, but even further more, you do not want the compressor starting while it is in a vacuum that Can be problematic and cause issues within the compressor, so i think that's what you were alluding to, but pulling a evacuation to dehydrate the system of any gases and or moisture or non-condensables before we're going to charge it with refrigerant. That is perfectly fine and safe.

In fact, you need to do that because if you don't pull a proper evacuation, you will have issues later on down the line which could lead to a failed compressor. Okay, so hopefully i answered your question kyle and thank you so very much for that. Super chat, bud um metalhead691 asked inside the chat as the live stream was started or starting he said. Can i briefly talk about capillary, tube cutters and yeah? That's a great great thing.

I'd love to talk about. So if you do a lot of work with capillary tubes, especially in the mid 2000s capillary tubes, were on everything, it's a type of metering device. It's essentially a long orifice that creates a set restriction that allows the refrigerant to flow through it at the right rate. They have to be sized appropriately, but oftentimes capillary tubes can get plugged up and or they can develop leaks and you might have to replace the capillary tube, which is the metering device right.

So how do i go about cutting a capillary tube? So if you go to the supply house, they'll actually have a tool called a capillary tube cutter, and it looks basically like a fancy pair of wire cutters and it has a small little opening and it supposedly crimps the cap tube perfectly cuts it and does not Restrict it when it cuts it now, i'm going to argue with that. You can clearly see a difference if you cut a capillary tube with a cap tube cutter versus the way that i do it. The way that i do it you can see now it may be marginal. What actually is happening, but i can clearly see a difference.

The way that i cut a capillary tube and i'm going to tell you how i have had capillary tube cutters in the past, and i realized when i was looking at a capillary tube cutter, i'm like why do i have this? I already have something that i can use as a capillary tube cutter and i don't need to buy an extra tool. You have wire strippers in your tool bag right. Almost every hvac technician. Hvacr technician is going to have a set of wire strippers grab that set of wire strippers do not cut the capillary tube you're just going to score the capillary tube.

Now the old school guys are going to be like yeah. That's exactly what i was saying score. The cap tube then break it. That's exactly what i'm going to do with wire strippers.

You can do it with a cap tube cutter, but it is not going to be a one-time cut. All i'm going to do is take the wire stripper put it over the capillary tube, where i want to cut it, and i'm going to apply gentle pressure, i'm not going to cut the cap tube all the way and i'm going to spin the wire strippers on The capillary tube a couple times until it scores the cap tube but doesn't go all the way through then, once it's scored and you see you know a little bit come off, you'll see a little ridge right there. You just take that cap tube and bend it, and it should snap right off. If it doesn't snap off on the first bend, then you need to score it a little bit more and then it'll snap right off.

Then what i want you to do is take the piece of the capillary tube that you're not going to use, and i want you to take a capillary tube cutter and just cut it and compare the opening of the piece that i scored with my wire strippers. To the opening of the piece that you cut with the capillary tube and you will see a rather large difference, you will find that scoring a cap tube, then snapping. It off is a much better way to cut a capillary tube instead of using a one time cut on a capillary tube cutter. So that's how i cut capillary tubes.

Now what i will tell you is often times on systems. You will find that capillary tubes, when the manufacturer installs them they're, going to be wound up in a nice light little spool and it looks really cool. But then you get yours and it's in this jig giant, big roll and you're like what do i do? Capillary tubes are very resilient, so just find something round whether it be a soda can now old school, i'm gon na date, myself. What we would use to roll up a capillary tube was a maglite flashlight because we used to carry a 3d or a two cell d, mag flashlight in my van right in my tool bucket at the time, and i would take that mag flashlight maglite and i Would roll the capillary tube around it because it was the perfect diameter and then you would get a nice tight roll? It would be perfect and it and that's how i would do it nowadays.

I don't carry a maglite flashlight anymore. You can just grab. You know anything round, usually you can find something around in the kitchen and just wrap the capillary tubes around it. You'll get a nice clean roll and then you can shove it in wherever you need to go.

So hopefully that answers your question about cutting the capillary tubes bud all right um. Let me see what else we got going on in here. 716 appliance guys see you later bud, thanks for coming in here, man, all right, um. Let me see what else we got going on.

What am i missing? Uh sans comic thanks, so much for that super chat. Man have, i played uh delta roon channel 2. Yet, no, i don't know what that is, i'm assuming that's a game, but i don't really play uh games, computer games or anything. So no.

I have not played that, but thank you very much for that super chat, but um, let's see uh. What am i missing? I'm missing all kinds of stuff in here. What did i miss here? Um all right, uh r290 is flammable gasket proper training before trying to work with it. Howard sharp, that's a statement, i'm assuming he's talking to someone else, but yeah.

You definitely want to understand the potential negative consequences of working with r290. You need to follow proper refrigeration practices, but then, on top of that, there's a few other practices that you need to follow, such as purging the system and sweeping it with nitrogen. Before you even cut into the system to make sure or to do your best to remove uh flammable gas pockets that could be left in the system, you never typically don't want to try to unsweat dryers or anything like that. I mean sometimes you have to, but you just need to be aware of your surroundings, be in a well-ventilated area.

Just know what you're doing, if you're, going to try to purge the system or sweep it with nitrogen before you braise or anything like that, keep in mind the systems oftentimes will have solenoid valves and or restrictions in them because of metering devices and different things like That so, you need to make sure that you have a full flow through the system before you try to pressurize it or and or sweep it with nitrogen. So let me see what else we got going on in the chat. Remember if i'm missing stuff, um, definitely jason johnson, you have a cap tube cutter, that's cool! Try what i said! Try it next time just take wire strippers and score it. You can even score it with a cap tube cutter too, but just try scoring it next time.

You do it and and compare it to the cap tube cutter and you will see a difference, a noticeable difference, whether or not that difference makes a pressure, difference or restriction. I don't know, but i can clearly see a difference with my eyeballs um see what else we got in here. The only dumb question is the one not asked, and that is very true, jason johnson, all right um. What happens if you don't purge with nitrogen, while brazing heard mixed answers joshua, what can happen is uh.

You can get um, i'm not gon na get super technical because i don't remember half the technical terms, but essentially you're going to get. I think carbon build up inside the lines, so um just take a 7 8. You can experiment on this. Just take a 7 8 inch piece of copper and and just take the torch and just heat it up to the point that solder will flow on it.

Just have it open 12 inches, something like that open on each end and just look at the amount of black like carbon type substance that builds up inside the pipe and it's because of the oxygen and some kind of chemical reaction that happens with the heat and Whatever i don't know, it's some voodoo magic stuff. If you sweep the system and then purge it with nitrogen, while you're brazing, you will actually notice that you do not get that black carbon buildup, that black carbon, whatever stuff that is, will start to restrict liquid line filter dryers. Now i will tell you, i had a i went to go: do a warranty job for a customer that a a manufacturer that called me out to a college, a local college of mine, and they had a new campus built like this huge facility and they had Refrigeration equipment, they had a giant parallel rack on the roof, parallel, meaning they had multiple compressors. I think it had three scroll, compressors, um piped in parallel and uh.

They basically all ran off of different pressures. Uh they had pressure controls and when the load or the demand of the system went high, you know more compressors would turn on it had walk-in coolers and maybe, if i had to guess 20 different, reaching coolers, maybe a couple different, walk-in coolers on it. So it was a big system, hot gas bypass, all that fancy stuff. So what i found was the manufacturer called me out.

They had a bunch of reach and refrigerators that weren't working properly and i found there was like i don't know - i think, maybe six of them that all had restricted expansion valves every one of them and i'm like what the heck you know. So i pull out the expansion valves and i cut the expansion valves out and i disassemble the expansion valves and what i actually found was. They were all restricted with, like the carbon flakes from someone not brazing with nitrogen okay. So what we had to do, and in order to do this too, they had no isolation valves installed on any of the reaching coolers and mind you.

This was a big giant system, so i had to pump down the entire rack right: the entire system, all the walk-ins and everything i had to pump it down. I had to install isolation valves on each refrigeration unit. I think it was six or something like that. So suction and liquid isolation valves on every single one and then what i had to do was after i installed those isolation valves.

I had to change the core dryer on the roof right, so we had a big core dryer. We changed that out and we were pulling handfuls of carbon flakes out of that dryer from new installation because they did not purge with nitrogen and then every expansion valve in all my systems was bad because they were restricted and it was all because on this big Installation they were not purging with nitrogen, they must not have swept the system, i mean, even if they didn't purge with nitrogen, they could have at least swept the system. There's things they could have done and it was a mess and we ended up having to shut down the entire facility just to pump it down to do all this work. Now, once i pumped it down, even after i installed isolation valves, i changed the expansion valves change the dryer on the roof.

We had to come back like three times for different units because the expansion valves kept clogging up and in that situation we actually had to install liquid line filter dryers at every single region, so they had redundant filter dryers all throughout the system, and i was all Worried about pressure drop and stuff, but at that point the manufacturer was done. They were like we're not warranting any of this stuff anymore and i was working for the manufacturer, so i was like well, you guys got ta pay me, i'm not here to work for the customer, you know. So it was a mess and it was all because they did not braze with nitrogen while starting up that system and they didn't properly purge it and it was just a mess. So you definitely want to try to purge as much as possible, but let's be practical - and i do say it in my videos - often sometimes i can't sometimes in weird situations in a pump down or something like that.

It's not very practical and you can't always purge with nitrogen. So sometimes you have to do what you have to do, but when you're doing big installations like they did on this system, it was a huge system. You know there's a mile of pipe or whatever it is yeah. You need to purge because you're going to have a lot of carbon buildup in that system for sure and at a minimum the amount the person who installed that should have put isolation valves on everything.

So that we could have at least isolated every system, it was a mess all right um. Let me see what else we got going on in here um. When is it okay to use stay bright? Eight, you see a youtuber use it on 410a systems, richard burton hey, you know what i hear a lot of people that talk about stay bright, eight to be fair, stay bright, eight is a brand specific uh uh it manufacture. It is a low temperature solder.

There's a couple different manufacturers that make this brand or this type of solder, but it has a low melting point um and the the the theory is is that if you use a low temperature solder that you possibly won't have to use nitrogen to braze the system In and or you don't have to get the components as hot to make the solder bond to the two metals okay. But when you do use some of these low temperature solders, you typically do have to use a fluxing agent, it's very similar to a tin based solder that you would use on plumbing systems. Okay, so i currently don't use any low temperature solder, such as stabrite aid or any of the other ones. I personally don't care for them simply because i fixed a lot of leaks on low temperature solder and i don't have to fix very many leaks when i use 15 percent silvos or 56 silver solder.

Those are the only two solders i use when i'm doing refrigeration piping, uh 56 is for dissimilar metals. If i'm doing copper to brass stainless to brass stainless to copper, i will use a when you have dissimilar metals, two different types of metals and you need to bond them together. We will use 56 percent silver solder and then, if we have copper to copper connections, we're going to use 15 silver solder. That's how i roll i've just fixed too many leaks on the low temperature ones, and then one of the problems i run into with low temperature solders is when you go to fix a leak later on it.

What do you put on it? If you don't have that same low temperature solder, do you try to mix silver solder in there? I haven't had very good luck in the long term of getting silver solder to mix properly with the low temp solders. It's just a headache because that'll carry those low temperature solders, so i try to stay away from them as much as possible, but that's just my personal preference. Some people swear by them. Some people love them.

I see people on social media that say that's all. They've used, i see people on social media saying everybody's, a hack that doesn't use it. You know i'm not gon na pass judgment on people. I just do what i wan na.

Do you know, so it is what it is. Uh, let's see what else we got going in here, yeah, if you guys have questions, you definitely want to put them in caps. Lock. That way, i can see them.

Okay, purging with too much pressure with nitrogen is bad. Yes, it is because, if you purge with too much pressure, you can actually cause the solder to bubble out. So you definitely want to purge with a very, very low pressure, typically uh. They i'm trying to think of the the flow rate.

I can't even think of the flow rate. Is it three fcs there's there's a term that you're supposed to use? What i actually use is the western enterprises vn 500 regulator, and it has a braised setting on it that just flows, the nitrogen just at a very, very small flow rate, and it works perfect for brazing when i'm uh, when i'm pushing nitrogen through the system. But you definitely don't want to have too much in there when you are purging with nitrogen, when you're braising, you need to make sure you have an exit point for the nitrogen, hence what i showed in my ice machine video not too long ago, where i was Unsweating a dryer and i had someone hook up the nitrogen, but i you know my fault. I didn't tell them to take the low side hose off so that way it gave a place for the nitrogen to escape and then it blew the dryer out.

You know there's like a little poof explosion, kind of a thing, nothing bad, but it just popped and scared the crap out of me. So all right, um, you haven't yet uh, but do i use silver on txvs? No, i don't use silver solder on a txv unless it's like i mean typically like the sporelin, txvs and even other brands of txvs. They will often be copper, coated, brass or copper coated steel, even on some of the dan foss, because dan foss is notorious for using stainless steel txvs, but they actually have a copper coating on them. So there's a little bit of a different process, but majority of the time you don't have to use silver solder.

You can actually use just standard 15 sulfus, so you just need to look at the type of the metals. If you have two dissimilar metals, then you have to use you know and it doesn't have a copper coating. Then you have to use um uh, you know silver solder. Basically, so all right, let's see what else we got going on here.

How often do i install twist timers, like in my recent video uh? We have a lot of walk-in freezers with this time twist timer. So it's a very common thing that we do. What i typically do is, if i'm or actually what i wanted to talk about, because someone had actually asked me this question. So let me find it on here right here.

I don't have the person's name, but the question was: why don't i just install a door? Switch on the walk-in freezers instead of a twist timer um, i haven't had very good experience with door switches: okay, uh. Let's, let's start this out, i'm dealing with typical walk-in freezers. I typically don't have a low voltage control circuit, i'm usually dealing with high voltage 208 volts running through the switches. So if i'm going to use a door switch, you want it typically to be on a pump down circuit.

So that way, when the door opens, it goes to a pump down, but i would find that i have had some systems that have door switches on them and i find a lot of nuisance service calls on those door switches where the customers still leave them open And then what will happen is oftentimes on the evaporative coils that have logic. They'll typically have a circuit board inside of them. If they have a door switch interlock built into the logic board, they will oftentimes have the system shut off, but then, after so much time of it being open, it will default to normal operation. Assuming that the door switch is bad, so it'll start back up and start running, even if the door is wide open.

So they do that because they're assuming that maybe the door switch, had failed or something it's just. So i don't really use door switches because i'm typically not running low voltage for my control circuit uh. If i was you know, maybe i don't know i just really don't like the door switches too much because of all the nuisance problems i've seen with them. I prefer a twist timer uh, the i have a much lower failure rate than what i see on door switches, but i don't work with door switches a lot, so i'm also just not very familiar with them.

You know i mean i've only seen them a few times, but i have seen a few fair failures on them. So is there a chart for sizing r290 capillary tubes? I have not seen an aftermarket chart randy on r290 capillary tubes, and i'm going to tell you right now: you don't want to use an aftermarket r290. You don't want to try to cut your own capillary tube or anything like that for liability reasons. I'm going to strongly advise you that, if you're changing a component on a system that has r290 in it, take the liability out of your hands and only use oem parts.

I know that's a pain. I know it sucks, but i would highly suggest that you not try to field modify anything trying to make your own capillary tubes or anything like that, because if there ever was a failure that turned catastrophic with that r290 cooler, you don't want to be on the Losing side of that and the manufacturers typically have better lawyers than all of us, so i can guarantee you if they find after-market components or things that aren't factory on that they're, going to try to push the blame onto the contractor that installed the aftermarket components. So i would highly suggest that you only go oem um. So to answer your thing, though, i have not seen any aftermarket charts on r290 stuff yet so i really don't have an answer on whether or not they have a chart.

Um harry had asked me a question through email about setting pressure, controls for pump down systems and he wanted to know if i could make a video on that there's a possibility. You know i typically don't go with a video in mind and start filming. I typically just go, and just film whatever happens: okay, so harry, there's a very good possibility that i will get an opportunity to discuss setting pressure controls um. I will cover a little bit on here.

The first thing you want to understand is you need to have a pressure temperature chart. Now you guys can kind of see the tail end. I have a big giant pressure temperature chart right here and i can see that you want to understand the pressure temperature relationship of that refrigerant. First and foremost, a pump down system is a system that a solenoid valve closes and the refrigerant levels continue to pump until on the suction side, it gets lower and lower and lower, because typically the pumped down solenoid is installed on the liquid line and it shuts Off the flow of refrigerant and the compressor runs until it gets to a certain level, then the compressor turns off.

What setting do we set that pressure control at there's a couple, different methods you need to or things you need to consider when you're setting a pressure control. First and foremost, you want to lean on the manufacturer of the compressor and find out what they recommend. As far as pump down settings for that compressor, if you're dealing with a scroll compressor, scroll compressors, don't like to pump down past 5 psi - sometimes even 10 psi. So they don't like that, because what you'll find is, if you try to pump down a scroll compressor and you get it down to 5 psi when you turn it off.

All of a sudden you hear you'll hear a sound and the compressor's pressure internally will relieve itself and it'll equalize out to where the pressure rises. And then the compressor will turn on again and then it'll pump down to five and then turns off and it rises again and it's short cycling on off on off on off, and i have seen that cause catastrophic compressor failures, because the compressor's running it's overheating doesn't Have proper oil return and it will burn itself out over time, so how do we know where to set that pressure? First and foremost, you want to lean on the manufacturer. Next thing you want to understand is what you're trying to do with the system. Okay, what temperatures are you trying to maintain you? Typically, so, whatever you set your cut out pressure at the pressure at which the compressor turns off.

You have to consider what you're going to set your cut in pressure at too. So you want to lean on the manufacturer to find out what they recommend the cutout pressure be for that compressor. But then, when it comes time to setting the cut in pressure, you have to consider what ambient it's going to be outside if the condensing unit's sitting outside what ambient it's going to be inside the box because of a pressure temperature relationship, if it's 40 degrees outside And you're trying to maintain 40 degrees in the box. Well, the pressure in the system is only when it turns on is is is going to be driven by that outdoor ambient pressure that our temperature that outdoor ambient temperature is going to warm up the refrigerant in the condenser and when the solenoid valve opens that temperature Is going to make the refrigerant be at a certain pressure and it's going to push it through the system, so you have to keep that in mind.

So you look at a pressure chart and you find out that for 404 a 40 degree ambient, let's see at 40 degree ambient 404 a looks like if i'm looking at my pressure chart it's at about 85 psi at 40 degree ambient. So you want to make sure that your cut in pressure right is no higher. Is it no higher? Am i twisting myself up now? I'm gon na have to wait for the video, because that way, i can think about this, because sometimes i mumble on my words, but you want to pay attention to the ambient temperatures and the temperature inside the space. That way, you don't mess yourself up by not having enough ambient temperature outside to drive that refrigerant pressure through the system.

Okay, so keep that in mind and stay tuned i'll try to make a video where i actually make it all make sense. I'm sure i just confused everybody with what i was just talking about so um guys in my recent video on the walking cooler that wasn't working where i had to fix seven leaks between the two evaporative coils. I had a bunch of people that reached out to me that said, hey when i was brazing, they saw the lines move and i did see that while i was brazing, so what had happened was the the lines were not necessarily they were kind of at a Bind and as i was brazing or heating them up to braze on them, they kind of flexed and some of them popped out. Some of them pushed in different things like that, but i didn't.

I did notice that when i was doing that, but i didn't really see anything bad about what was happening. It wasn't concerning me. They kind of flexed a little bit and moved a little bit, but they were still in the fittings enough that it wasn't a concern to me, but keep that in mind. I was just talking with my apprentice today about brazing, because i you know i was hurting.

I was we were soldering, some some water lines and i kind of burnt myself with a map gas torch. You can't even really see it, but there's a tiny little blister right there, and i was just having a discussion with my apprentice, because you know we're getting ready to start brazing and doing that kind of stuff and letting him get his hands wet with all that Stuff - and i just told him, i said you know, there's instances that you have to learn how to not react in certain situations, so we were soldering some some drain lines together today and i accidentally waved the the map gas torch across my wrist and it burnt. My hair off and gave me a little blister life happens, but it's learning how not to react in a bad way when that kind of stuff happens, because what happens if you're brazing in a compressor when a condenser fan motor is running above your head and you.