Hey, how are you guys doing this evening? Hmm, hopefully you guys can hear me all well. Hopefully you guys had a good week. It was kind of hectic for me from last week, but I mean nothing too crazy. I was kind of getting over a cold.

The last stream that I did that night, it was just miserable and yeah long story short. I don't need to talk about that, but so hopefully you guys are all doing well. I've got some stuff. I want to talk about.

I've got a little thing. I wanted to kind of cover real, quick to kind of start out with and then we'll see if we can't get to some of your guys's questions. Okay, I see there's a lot of guys here in the chat it kind of still blows my mind how many people come into this thing right away, but it's a trip so and for those of you there's probably only a few of you that do live streaming And stuff YouTube: has this new stream screen whatever and it's very distracting. I kind of think I need to come up with a new thing where I don't have to stare at it, because it shows you numbers and it's kind of whatever.

I don't need to pay attention to that because it just distracts you so so I wanted to start by talking about a little problem I ran into today, and I just thought it was a good teaching point, and hopefully you guys get something from this. So I've mentioned this before in my videos and different things, but it's taking an educated guess, okay, that sounds kind of like a scary word but or scary phrase I should say, but sometimes you got to do what you got to do when you can't seem to Figure out what was going on, and so let me give you an example. So today I got a service call on an packaged unit. Air conditioner, not working, it's a small little five ton unit and the complaint was that it wasn't working.

So when I arrived, I walked in the door and the manager said: oh no, she said um, you know I just called and cancelled the call and she goes. You must not have received it yet and excuse me so I said yeah. No, I didn't receive it yet so, but I'm here so why don't you tell me what's going on and she says: okay, she goes well I'd rather have you check it out since you're here, so she explains to me that her office, air conditioner wasn't working. So, okay, so I asked her a few questions.

You know how long has it been doing this? Was it all weekend or was it just today? She goes. It was just today she goes normally. When I come into my office at 6:00 in the morning she goes. It's cold in here and she goes.

You know I noticed about 10:00 a.m. it was still warm in here and it wasn't getting cool at all and she goes in fact it was about 80 degrees in my office. So she said she went over to the thermostat and she she didn't quite remember what it said, but she kind of pushed a few buttons and then nothing really happened. So she figured you know.

I was already on my way so whatever well in the meantime, then, all of a sudden the air-conditioner started working and then I walked in the door and she said you know just go ahead and check it out. So I went up onto the roof immediately jumped on the roof. The unit was running, but you can tell that my return. Air temperature was about 82 degrees, so you can tell that it had just turned on okay because had it been running for a little while, you know the potential of the return air to be more or less like 76 75.

But the fact that it was still 82 degrees - and that was the temperature in the office to me - told me that it just came Don. So again, you kind of have to I'm working my way through this trying to pay attention to everything and use my senses. So went ahead and just pulled off a couple panels. I didn't shut anything off.

I pulled off a couple panels. Amped out the condenser fan motor, which is like a common thing. You know if the condenser fan motor failed. It might have got off on high head pressure.

Who knows so amped out the condenser fan motor inspected the electrical. I did not see a need to put on service gauges. At this point. The supply air temperature was about 22 degrees below the return air temp, which man you know not too bad, and I have history with this particular unit.

I had just actually done a video on it where it's a small little 510 and we changed a compressor. That was the one where I had the apprentice braising in the liquid line. Dryer so anyways couldn't find anything wrong. You know right off the bat.

So then, I went downstairs and started talking to the manager and I went to the thermostat again and I noticed that in front of the thermostat they stacked a crap ton of jackets and there was purses and everything all leaning on the thermostat. So I had to move all that stuff to get to it and then I'm just looking at it, and I noticed that this is an old, older, ven star thermostat, not really a fan of them. They replace the old-school carrier, thermostats anyways, so notice that the program wasn't turned on. It was actually turned into auto mode, which means that it's gon na run at whatever temperature it's at and never shut off until someone physically goes and turns it off.

Okay, so I brought that to her attention. I said you know it's auto mode right now she goes well. I change that she goes when I was playing with it. I was just kind of moving through the cycles and I put it in Auto mode.

She goes and then it turned on so at this point I went through everything and my diagnosis in my head. Before I talk to her was either the thermostat was turned off or the thermostat is going bad, because everything else seems to check out okay, but unfortunately, I'm not seeing whatever the problem was in front of. You know what she was seeing. It was working when I got there it's one of those ghost problems right, so the way that I approach this was, I just went down and logically explained everything to her look.

This is what I found. I really don't think, there's anything wrong with the rooftop unit. Everything seems to be fine and here's. My assumptions I'm going to make an educated guess and I'm going to tell you that either we have a bad thermostat or it was simply turned off, and I basically at that point, put the decision making process into her hands.

Okay and let her make the decision, I said, look we've changed three of the six thermostats in the last couple years here I said so. You know it's logical to think that this thermostats going bad, but it's working fine right now. So what do you want to do and I let her be part of the decision-making process? Okay, in that situation, now what I did by doing that was, I put some of the the responsibility in her lap. Okay, I gave her the facts.

Let her know what was going on and then let her decide that hey. You know what I want to wait and see if it happens again. Okay, now, in the meantime, what I went ahead and did was, I went ahead and I checked the programs on all their thermostats set the times verified and then went ahead and locked them all. So that way nobody can turn them off anymore, accidentally, potentially, okay.

So now, if I have to go back again and the thermostat is still locked and I find it in the off position, then it's logical to think that maybe the thermostats going bad. So you know sometimes in my opinion, we have to make these educated guesses and they might, they might lead to problems, they might know it, but I you know if I can't find anything wrong, I'm not going to guess that hey it's got. You know this going on, or this going on I mean the only thing I could that could lead me to it was that the thermostat was something to do with the problem, whether it was turned off or whether it was simply going bad. You know so you know.

Sometimes we have to do those yeah. You know in a situation where you're not capable of making those decisions. I'd highly suggest you lean on your management, whoever your supervisor is or something like that, but you know in this situation. I just basically put it in her hands and she decided that she wanted to wait.

So you know and - and I very politely documented everything in the invoice - that the manager declined changing the thermostat and you know that what she just wants to wait and see what happens. Okay, so then that takes the liability out of my lap. If there's another problem again tonight - and it was nothing rude - nothing hostile the conversation that we had - it was just a very nice conversation. She totally agreed like.

Oh, I understand - and I explained to her - I wrote this all in the invoice and she's like okay cool. I really appreciate it, you know so just one of those things. Hopefully that helps you. Maybe you guys you guys in the chat.

Do you guys ever have to do that kind of stuff? Do you ever have to make educated guesses and you know decide that kind of stuff? You know I run into having to make those decisions quite often where you have to make an educated guess where you just look at everything. You know knock things off your list. Okay, it's not this! It's not! This logically doesn't seem like this. You know and move your way down the line so see what you guys have to say in the chat here.

Let's see right on there's quite a few people in here. One thing I do want to go ahead and get off my list of things to do right here is: I mentioned it on the last stream that spoilin has their spoilin 85 promotion. What they want you to do is take a picture of any of the older spoilin memorabilia and older spoilin component, a brochure something sitting out a supply house and put it on social media on Twitter or on Facebook, with the hashtag spoilin, 85 and you'll be entered Into a drawing to win some beer mugs, this is actually one of the mugs right here. They actually just sent these to me today spoil in 85, it's just a nice glass.

It's got some blue riding on it, really cool little glass. Of course, this glass has apple juice in it guys, okay, but yeah. You get a enter it into a drawing to win one of these, so it's a really easy. Little thing all you got to do is tag spoilin with the hash X, Portland 85.

So I highly suggest you guys, try it and see if you guys can't win some of those glasses. I got a couple more sitting right up there, so um, alright, yeah, I see Justin. You said process of elimination exactly dude. Sometimes you got to do it.

You just got to kind of go through the list there and see what you can find so hello to everybody. That's saying hi how you guys doing today, there's quite a few people in here. I can't really say hey to everybody, but you all get what I'm saying here so and let's go through my list. Do me a favor just like Justin? My moderator had said earlier.

If you guys have questions, please put them in caps lock. So that way we can try to make sure we get to them and we address everything so um, let's see all right, I don't see any questions as of yet so I'm gon na go ahead and go to my list for those of you that sent me Emails for the shirts I sent out a bunch of shirts and hopefully you guys got them the people that I didn't respond. I sent emails once I shipped the shirts, so if you didn't get an email back from yet I'm just simply out of shirts, so I'm working on place in another order and then we'll figure out a better distribution method, because the permanent method of distributing them is Not going to be me sending them out the way that I did but um yeah. I should get another order in soon and I haven't placed it yet, but I kind of got to get a count and then we'll work on getting some more shirts.

For you guys, so let me turn on my fan because I'm kind of getting hot over here all right there we go and let's go ahead and get to our list. Okay, oh that's funny! So you, you watch my videos, but you have no idea what I'm talking about half the time right on, but you know it's interesting. I get a few emails from people that don't know anything about the industry, but yet still watch these videos, it's kind of funny. So kind of a trip - yes, I do I own my business, it's a partnership.

I work with my dad him and I are partnered together and we run this together. We're a small refrigeration company here in Southern California. We've just got a couple service trucks out there guys nothing crazy myself, my truck and three so four trucks traveling all together. So four employees yeah.

So it's going good so far, we're just small little company. We try not to get too busy. We try not to go too crazy, so all right, how do I feel about ez seal on art to use with leak detection? That's a great question to start this off. Okay, I'm not judging you guys! If you do it, my personal preference is to not use any additives in my air conditioning or refrigeration systems that don't pretty much come in the system.

Okay, so I'm not a fan of like the the leak sealants, the the dyes and different things like that. I'm not gon na lie and say: I've never used them because I have I've used a leak sealant on two occasions where the customer specifically asked for us to put a leak sealant in there. I'm gon na tell you that both of the times I never saw any great results from those leak sealants. They were both two different types of leak, sealants and as far as dyes go.

I have used dyes two or three times, not a fan of them. It was something else again, last ditch effort. The customer wanted us to do it and we did - and you know that's what we put in there, but personally not a fan of the dyes, just not something that I want to use and then or the leak sealants. Okay, now you know, I know that there's situations that may call for it.

You know you've got a lines that you can't get to or something like that. But I've read a lot of great information. I've listened to some interesting podcasts, especially some with mr. John Pasteurella from refrigeration technologies.

Where he's basically talked about what's in the dyes - and you know, I understand, he's just a person and I'm listening to what he's saying. But it's very interesting what he says sounds very believable about the the additives and different things, and it's just not really something that I choose to put into the systems that I'm working on. So my personal preference is just to stick to. You know fixing the leak, you know if you can't find the leak pump.

The system up with nitrogen, with the tracer gas, of whatever the refrigerant, is, and look for the leak that way keep adding gas. You know the leaks gon na get bigger and bigger over time, so just keep adding nitrogen building up the pressure being safe. Not you know you don't ever want to exceed the operating limits of the coil or anything like that, but knock on wood cross. My fingers, I've always been able to find the leaks that I've been looking for.

So what books do I recommend to go to and take the c-38 test? You want start your own company Aldo. I have to tell you honestly, I don't know of a book to take the c-38 test. I honestly don't have my contractor's license, so I you know I wouldn't know, but I I'm sure, there's tons of study materials out there for your contractor's license. So you know, have I noticed capacity loss in walking coolers with drop in refrigerants.

You know I really haven't seen a big problem there, Steve with the drop in refrigerants. I've used a few different drop ins over the years where I saw problems was not so much in the capacity per se, but it was in my might, okay, so background. I came up in the trade in the mid 90s, so we were using a lot of the r12 drop ins, our 409a and we were using the 502 drop ins, our 408, a hotshot different ones like that, okay. So one of the problems that we ran into at that time was the refrigerant manufacturers were giving the refrigerants to the supply houses and the supply houses were giving us very vague information.

The internet wasn't as popular and is easy to use at the time. So we kind of had to rely on what the supply house has told us a lot of the systems. When we were going into the 400 series refrigerants 409 a and 408 a they ran higher head pressure, basically, okay and they were replacing r12 in our 502. When they were replacing r12, that was a bigger issue.

The the 409 a ran a little bit higher on the head pressure. You ran the 160s 170 range when the r12 refrigerant was running. You know in below 150 range, so, but it wasn't just the head pressure. What we were finding was it was the density of the refrigerant all kinds of fancy technical terms, but if you would just drop in our 409 a on an old r12 system that had a receiver, there wasn't enough capacity or enough storage capacity in the system to Hold all the refrigerant needed to run the system properly.

The reason why I'm telling you that is, we still have the same problems today. Okay, when you use a drop-in refrigerant, you have to pay attention to how much you're adding so they always say to start with, like 70 or 80 percent of the charge, the weight in charge and then adjust by superheating subcooling from there. What you really need to pay attention to when you're working on duration systems is like, for instance, when you're done, you need to try to pump it down and make sure that the receivers not overfilled with refrigerant okay, be very careful about using the drop in refrigerants. Without changing refrigerant oils and also understand what the term drop-in means, okay, the term drop-in is kind of misleading.

It does not mean that you just put the refrigerant in. On top of the other refrigerant you never mix refrigerants. Okay, the next thing is is even though it's a drop in refrigerant, you might still have to change the oil. It depends on what the refrigerant is, even if it says it works.

Okay with the type of oil that your system has it may not. You need to do some of the research yourself and not just trust what the supply houses tell you. Okay. Hopefully that answers your question.

So all right, the Nasus you're checking out thanks for the super chat by the way, so you're checking your 240 volt condenser fan motor between line 1 and line 2, and you have resistance, but your o meter is beeping. Does that mean that my lines are shorted between l1 and l2? No not necessarily depends on the the sensitivity of the continuity test or on your own meter, so it doesn't necessarily just because you're getting an audible tone doesn't necessarily mean that it's shorted, no, not necessarily so all right. Let's see, I'm gon na go ahead and get to my question my list here and so a question that I got from about three or four people between the last two videos was especially my last video, where I posted about a walk in what was it about? It was about a walk-in freezer. I refresh my memory here for a sec walk-in freezer with blue with the super heat to low, and I mentioned that in that video.

That was the one where I just that the expansion valve open and closed and got it to start. You know reacting and I'm putting in a quote basically to replace the expansion valve, but I said at the same time when I changed the expansion valve, I'm gon na recommend that they change the thermostat. I'm gon na recommend that we changed the solenoid valve and the contactor the TX V and then add a liquid line dryer in a cyclist. I think I think that was it and the question that he got was: why are you gon na change those other parts? If they're not bad again, I'm taking experience and I'm making and educated guess, I guess you could almost say: okay, I've had a high failure rate on those cold pack, walking evaporator coils with the solenoid valves and the TX fees, especially when they have the emerson, TX Fees and solenoid valves, so I'm gon na open that system up and I'm not going to not change that still annoyed valve, plus I'm gon na end up repiping it so changing the cylinder valve is actually going to make it easier.

Okay, so you know sometimes when you you have to think logically when you're in a system - and you have to think okay, if I'm going to be in here once I finish this repair, I'm gon na own this system, meaning that the customers gon na think I Fixed it and if anything else, breaks they're gon na say hey what the heck. Okay, not saying that they're justified in that, but I'm gon na nip that in the butt it's a $ 40 solenoid valve okay, that I'm gon na change. While I'm in there making a $ 1,200 repair or whatever it is, you might as well just go ahead and change that solenoid valve. Oh, I'm not one for just changing parts like crazy, but because of the history that I have with those valves failing because of you know the fact that I don't like the way that that thermostat works it's a junky thermostat.

In my opinion, I have a lot of problems. My quote is just going to be to change all those parts, because I think that's going to be the best bet where I can stand behind that unit and guarantee that it's going to work. Okay, understanding that you know other things may break in the future. So, okay, so let's see what else we got! Okay, so do I have to pump down or recover to change the power head of a TX v, Gabriel Brown.

Well, if it's a refrigeration system, that is a standard pump down system, okay and it has a liquid line - receiver. Yes, what you can do you do not have to necessarily recover the refrigerant okay, so long as it has the right valves, you can pump the refrigerant down and it has enough storage capacity in the receiver. You can basically front-seat the king valve on the receiver and let all the refrigerant keep pumping. So the compressor is going to keep sucking on one side and pushing gas out on the other side, but it's not going to let it leave the receiver.

So the discharge gas is just going to keep pumping that refrigerant right into that receiver and eventually the low side pressure is going to get low enough that the system is going to be pumped down okay. So yes, in order to change a power head on an expansion valve, you can pump the system down correct. Okay, let's see what else we got. History repeats itself, that's exactly right bill! You know you just have to be able to make some some decisions and know when things are good, you know or what what you have to do to make things work correctly.

So, let's see what else so Nasus, then why is your own meter beeping? It just depends on how the ohmmeter set up personally, if I'm checking continuity on my field piece. Sc. 660. I turn off the audible tone so that way it doesn't beep and just use the ohmmeter you know.

So it depends on how you, this that the setup of your meter is and what kind of how it works. Basically, so what kind of guarantee do you give your repairs as far as time, nathan peterson, so we warranty our parts, whatever the manufacturer that we purchased? The parts from warranties them, typically that's one year for the most part, unless you're dealing with like Hoshizaki circuit boards or something like that. So, for the most part we on or whatever the manufacturers warranty is for the part, and then we usually do 90 days on our labor so, and that includes like our welding, you know our braze joints and different things like that. But you know it all depends.

Okay, cuz I've been known to warranty something later than 90 days. You know if I go in and be like. Oh my gosh, that bridge don't looks like crap I'll take care of it. You know I try to make my customers, you know.

If I realize we did something wrong, we're gon na try to make it right, but for the most part on paper it's one year, parts 90 days, labor. So all right, let's see if I would have left the TXV. How long would it have worked? Well, the TXV I did leave it. I haven't changed it, yet I just adjusted it now.

How long would the compressor have lasted if I wouldn't have gotten that super heat up on that TXV, it's hard to say it's a gamble. I mean, even still after I make the repair, I'm gon na, make sure that the customer understands this system was running on extremely low super heat and we could have compressor problems in the future. I have no idea the shape of the compressor. I did everything that I could to test the compressor, including inputting the numbers into the copeland mobile app and doing a pump down test on it.

You know just checked everything that i could make sure it wasn't over amping make sure it wasn't getting too hot. You know that kind of stuff, but i can't guarantee that that compressors never going to have a problem when it was running with that lowest superheat. So and as far as how long it's going to be before that happens, I don't know. Oh there you go Cory, say you're having trouble with the 3d scroll oil distribution with drop-in replacements for r22.

You have a 3d scroll torn apart right now, but not a Copeland, scroll, dude Copeland Scrolls have oil pumps, okay, so with the 3d Scrolls there's actually a service bulletin by Trane, and if you actually do some research online you're going to find out that you should Never ever use a drop in refrigerant on a 3d scroll compressor, especially if it has mineral oil in it. Okay, the refrigerant manufacturers will tell you oh yeah, our refrigerant, you know. Drop-In replacement for r22 works great with mineral oil, but guess what it doesn't work with. The 3d Scrolls I have some history with a 3d scroll.

If you guys don't know 3d scroll is the giant green compressor, it's actually a Danfoss compressor. If I believe, if I remember right but um, I don't know if it's actually danfoss. It looks very similar to a Danfoss compressor, but the 3d scroll is the compressor that train uses on their bigger package units and you see them on the 15 tons, maybe even bigger, maybe maybe some of the smaller units, but yeah. You do not want to use any of the drop-in replacement refrigerants on those.

You only want to stick with the OEM refrigerant, especially when you're working with the 3d Scrolls. I read something I don't know if it's completely accurate, but it's something about the top. I could be talking out of my butt right now, but it's something about the top, bearing on the compressor with the oil coming back. It lubricates the bear something like that: ok, there's something funky about it and you'll end up burning up the compressor that the motor will seize up because it doesn't have proper oil return or something like that.

Coming back to it. But again do some research and there's actually a service bulletin. So if you look at most of the refrigerants look up, Trane 3d scroll, drop-in, refrigerants and you'll see all kinds of posts about it. On HVAC talk the message board about why you shouldn't use drop-in refrigerants with the 3d scroll, so yeah be careful about, I mean sometimes you can, but you just got to be careful about it.

I've had some really bad luck. I went through two compressors myself doing that and I ended up eating the cost of a 10 ton compressor. It wasn't fun. So what makes the Copeland scroll work better than the 3d scroll? I really don't have much to say about that Cory.

So yeah it's dan Foss. I believe Dan Fossum makes that compressor, but I'm yeah the the 3d scroll. I see Zacks even saying it. It's a reoccurring thing.

A lot of people have said: don't use it? Okay, how is it over there? How many percent can a system leak during one year and still be okay? Stefan boo Joel, I don't know how to pronounce your last name there, but but okay, so here in the United States, the rules are. If your system has, I think, it's 50 pounds or less, I think someone can correct me in here. Maybe you can Ralph, I think if it's 50 pounds or less you actually there's no rate at which you can't keep adding gas to a system. It's unethical that you don't fix the leak, but if it's over 50 pounds, then you have leak rates and different amounts that you have to.

You can only leak so much per year before you have to fix it. But if it's under, I think it's 50 pounds. Yeah, if it's under 50 pounds charge on the system, you don't have to actually technically fix it. You can just keep putting refrigerant in it.

So, okay, so Ralph, you said you pump down a fractional horsepower compressor and it goes down to negative 20. But climbs back up to a positive 10 in less than a minute is the suction valve shot? Is it a reciprocating piston driven, compressor Ralph? If that's the case, then yes, it does sound like you might have a problem there. Are you pumping it down on the suction service valve? I do have to say you guys. People may have seen me do this before it's an old-school method of doing a suction service valve pump down test.

Okay, it's not necessarily the correct way to do it anymore. Copeland doesn't really recommend that you pump down a compressor, so the old-school method on a semi-hermetic was we would front-seat the suction service valve. While the compressor was running, we would watch the compressor pull into a vacuum, and then we would turn the compressor off to see if the reed valve let gas bypass. Okay, if it doesn't let gas bypass then, would still hold in a vacuum on the suction side.

But if it did start to rise and then went into a positive pressure indicated that we might have a bad suction reed valve, so we started to do that test on normal reciprocating, hermetically sealed compressors and in the beginning it worked okay. But a lot of the newer compressors they aren't meant to be pumped down anymore, so Copeland is actually I don't know if there's a service bulletin about it, but they've basically said you don't want to do a pump down test to verify that a compressors not working Anymore now I may do one you know as part of a lot of diagnosis like I may check the amps. I may check the Copeland app and I may try to pump it down, but you're, not you don't want to base your diagnosis simply off of it. Doesn't pump down anymore? Okay now you know, there's still some some logic into you know if you pump it down and it takes forever to get below zero yeah.

You know there's something going on there. Okay, what I would highly suggest, especially if it's a Copeland compressor, is just simply use the Copeland app Ralph. Look up the the Copeland mobile app input, your numbers, it just ask for high side, low side pressure and your amp draw, and it's gon na tell you hey, something's, not right. Okay and it's gon na tell you whether or not I gives you a percentage of failure, all right.

Hmm, let's see what else do a bunch of things are going by here? Really, quick! So do I have a video explaining how to use specific field piece equipment? I use and why you use the pieces use it would be a great sales tool for you. If I don't bop yeah, I don't have a video explaining the field piece stuff. I will work on something with that. Okay, I might be working with field piece soon with something too so all right, let's see what else I missed in here guys if I missed your questions or something like that, don't just throw them back down on the bottom again too.

So, okay! So another thing I want to cover guys is I'm reading these things. Nightbot is scaring you guys. You got you guys, like the movie references that nightbot is giving. So when you see Knight pop pop up there tell me what movie that's from that's actually from one of my favorite favorite movie series: the franchise is the Silence of the Lambs franchise.

Absolutely love those movies. Those things are awesome. My wife's think sort of the grossest things in the world. Then I try to explain to my wife they're, not gross their psychological.

They just mess with your head. There's a few gross scenes. You know but love those movies. So alright, let's see what else we got and for those that are watching this that aren't paying attention to the chat, there's a whole thing going on in the chat.

So if you guys can figure out how to look up the chat, do it because then you'll see what's going on, there's a whole conversation beside the stream that goes on in the chat too. So all right. So, while I'm talking this kind of led me into this, you guys got to remember something, and I've said this before. I honestly believe that there's something wrong in my head.

Okay, I do things really weird kind of OCD, I'm sure there's some undiagnosed things going on in there. If I wasn't filming I'm being dead truthful with you guys, I would talk to myself just the same as I do when I'm filming my videos, that's why I say it really doesn't take me anymore time to film a video when people ask me because it doesn't. I spend just as much time I talked to myself the same. That's my thought process when I work is as I'm working through things and I say them out loud.

Okay, I check this. I check that I worked through, so you know sometimes the reason why I'm telling you that is sometimes I will express some opinions in my videos and it's not so much that I want to bash that person. Okay, so I want to give you an example. In my last video I was talking about how much I dislike the Emerson, expansion valves and how much I dislike the Emerson, solenoid valves and someone had posted a funny comment and they said let us count the ways how many times how many times have you said You don't like this valve or whatever you know, and it kind of got me to think about it like I really don't mean to be bashing Emerson.

It's just that's just my opinion and that's the way it came out. So I try to be as truthful as is with you guys as possible without being vulgar or something like that. You know, and I mean I honestly tell you the truth like I really don't care for the emerson valves. It is what it is.

You know nothing against them and some people love them. I'm gon na tell you right now. I know some of you guys that are watching from other countries. All you guys have is Danfoss components in your countries.

I hate Danfoss valves. Okay, I not that I'm ever gon na work with him, so I just blew that sponsorship, but you know I don't like Danfoss expansion valve solenoid valves dryers. I just don't care for them. Okay, just not my preference, nothing against them, just not my cup of tea! Okay, so I prefer to use spoiling components.

That's why you know I work with spoilin, but I'm not telling you this crap, because I work with them. I I'm super stoked that I get to work with spoilin because I like their products. Okay, so it's not just that I'm trying to be nice to spoil in or anything like that is dude. I just don't like those other components.

Okay, so I don't mean to be bashing other people or anything like that. I, to be honest with you, I kind of feel bad for saying what I said, but you know I'd rather not talk crap about anybody, so you know, if I don't mention something, it probably means I don't like it. So all right, let's go often do I come across air handlers with adaptive, airflow control based on customer count and Germany. You have this type of system a lot.

So we call this demand ventilation here in the United States, especially in southern calorie in California, because we have a lot of requirements, and so we have a safety code. I guess you can call it that says that you have to have so much fresh air for the building per occupant and the easiest way that we can measure this, which is still kind of a crude way of doing. It, is by measuring the amount of co2. In the building, so we have a co2 sensor and what it does is it measures the amount of co2 and the theory is, is the more people the higher the co2 because we're breathing out co2 right, so the more people the higher the co2? So then we bring in more outside air to ventilate the building.

Okay, if you don't do that, what the research has shown is that people start to get you get that sick building syndrome, where people get sleepy offices different things like that, because the co2 goes too high and people are breathing that in and their bodies, don't like It so it starts to go into shutdown mode. So, yes, we are having that now. I will not say that it's all the way across the United States, but I do know that everything that starts in California ends up in New York and then ends up floating around the rest of the world arrest, the United States as far as energy codes and Requirements and safety crap. Unfortunately, a lot of people don't like the state of California, because we bring in all this drama and crap into the industry, but it is what it is, there's nothing we could do about it.

So so, yes, we do do demand control. Ventilation is what we call it here in the United States. So alright guys do. I know any.

Do I know about any training on refrigeration. We have lots of training classes around the United States and our local trade schools Aldo. So I can probably lead you in a direction. You can probably send me an email to H.

They see our videos at gmail.com. I would highly suggest for any of you that haven't already go to the internet and search up our SES org. It is a regional training organization, we're on a national, actually we're on an international level, because I know they have chapters in Canada too, but they are a training organization and they have lots of great training resources if you're in the United States. I would also look up for online resources.

It's about Q, which I believe is this California thing and then also HVAC, our edu. So it's HVAC our edu they're, an online training resource too other than that, if you're in the States I'd look up your local community colleges, local trade schools, lots of information, I've mentioned it a million times before, but I would highly suggest for those of you that Are interested in literature that, especially with the refrigeration that you look up, the book commercial refrigeration for air-conditioning technicians by dick, worse WI RZ and it's a great great refrigeration book that basically explains refrigeration to the technician that already knows how to work on air-conditioning. So it's a great great book highly suggest you check it out in the show notes of this video when it posts after this stream there'll be links to all those books so or to that book, and some other books too, that I highly recommend so um. Let's see what else he needs am a commander's office to make up for see we put so he does yeah exactly.

I do need to make up air. That's alright, though, because this apple juice is solving that problem. So alright, let's see what else I got in my list here. How often do I get to work on VFD based systems and what are the most used? Vfds, hmm! Well, I it depends on what manufacturer you're working with so I work on a lot of Linux.

Packaged units which use a Mitsubishi VFD, I believe I think it's a Misha Butte Mitsubishi. I think so. Alan Bradley is another name that comes up as far as VF DS and then mm a BB ya comes up but yeah. I I work on a few, so another energy code we have here United States are actually in California is basically that we have to have two-speed systems if they're over five tons or over two thousand CFM's.

I believe so. We'll have VFD driven indoor blower motors, so we do have to work with those they're, not completely variable speed. So basically they just run at two speeds. So when first-stage calls it runs at you know one speed and when second-stage calls it runs at four.

You know full speed so, but I do work on it a little bit. So does the three-phase motor draw high current when starting yeah I mean any motors gon na draw high current it wouldn't draw as high as a single-phase motor, but I mean the starting current. Is going to be the highest current of anything when you put a VFD drive on it, you can keep it low because you can do a soft start, but um yeah, it's gon na draw a higher current for sure any motors going to draw a high current. So three-phase is a lot easier to start because it doesn't have capacitors, so you don't have to add capacitors to it.

So alright giggity-giggity all right. There you go uh-huh. I like the family, guy references. So alright.

So another question I had was about negative superheat negative superheat, so I actually showed it in one of my videos. My last video I had I was using the field peace app and it showed negative superheat, so negative, superheats an impossible thing guys, because what is the opposite of superheated sub coins. So when you're, when you're doing you're using some of those apps, it's actually a problem with the app as my understanding. So it's it's, you don't have negative superheat.

Okay, the app should have known better and it just needs to be. There's there's something and I'll reach out to field piece and show it to them and I'm sure they'll fix whatever it is so buddy. I was just something in that video where it was just coming up with a negative super heat reading, but that was incorrect. It should have just showed zero degree superheat all right.

Let's see what else mmm yep. We got a lot of the HVAC overtime guys and you guys have a show coming up this Friday again right. If you guys haven't already checked it out check out the HVAC shop, Talk Channel, Zak was in here earlier, he might still be in here. He has great content on there he's streaming pretty much almost.

It seems like every day of the week and then also he's brought on the HVAC overtime. Show. A lot of the guys are in here right now too so subscribe to the HVAC shoptalk youtube channel and you guys can checkout the HVAC overtime show it's on Fridays. Guys, I don't know what the time this you guys are feel free to post links in there just inform so all right, all right, let's see what else it could also be your 10th row cuz.

I don't know the question, that's going there. So for those of you that don't know there's a whole thing going on in the chat like I mentioned before, and a lot of times, the guys in the chat will help other guys too. So I just looked over there and noticed it was a conversation and they're having a conversation in there about something else, so which is good. We're happy about that.

How about the trade show in Pasadena Aldo? I don't know what you're asking there Aldo, but I typically go to the trade show when it's in Pasadena, so I will try to let people know and I'm also gon na try as hard as I can excuse me. I'm gon na try as hard as I can to go to the the show in Florida this year. What is the ashtray show, I believe, is that what it is yeah you guys in the check and remind me whatever I'm mistakenly saying right there, but yeah it'll, be the big trade show. That's in.

I think it's in Orlando this year and I'm gon na try to make that one, so I didn't make it last year when it was in Atlanta, I think so. Alright, could I talk about working on EMS systems and what your troubleshooting and what they handle. So Chris chris cooley asked if I could talk about EMS system. So EMS is the energy management systems.

You're gon na find those a lot in chain. Restaurants, I deal with them a little bit to companies. Actually I'd only deal with one company right now, yeah anyway. So I've got a couple: restaurants that have it, but it's one particular company - that's running their EMS service.

So it's essentially just a monitoring service. Okay and they're they're paying attention to lighting they're, paying attention to air-conditioning systems, they're monitoring temperatures, they can do all kinds of stuff with the EMS system. So what happens is is let's say. For instance, I get a service call at a particular restaurant that has an energy management system.

So when I arrive I'll typically get a service call from the manager, but they'll say hey, they aim. Ems company called me and said I got an AC unit. That's blowing high discharge air or something like that or cold discharge air depending on what season it is so then we'll go out there and essentially what it is is the the restaurant itself typically doesn't have control of the thermostats or the lighting controls. Okay, we don't deal anything with the lighting, so I'm just going to talk about the AC systems.

So they do this for energy reasons, because they can have a single point, maintaining their systems and making sure that they turn on monitoring the systems and a lot of the times. The EMS companies will catch problems before the restaurant, even realizes it. So when you have someone monitoring a system via a program on a computer or a person actually staring at numbers, you know they can pay attention and say: hey the temperature between supply and return. They can set alarms on their computer and it can say the system is calling, but my supply and return temperatures are equalized.

There's a problem here before the restaurant, even realizes it, because if you guys don't realize this a lot of the times, an air conditioner could go down and it could be hours or even days before the restaurant even realizes it's down you know and by then they Could be getting guest complaints in the moment that a customer walks out of a restaurant, because it's too hot in there you know that's a lost sale for the restaurant. So the logic is: is that if they can solve those problems before the restaurant even realizes or feels it, then they can save money. So they'll have an energy management company that uses all kinds of different controls. Again they can do all kinds of stuff.

You can have really cheesy easy ones, basically, that are ran by internet controlled, thermostats, basically, and you can get those with a lot of the different manufacturers. There's some smarter internet controlled thermostats like Bay web and then there's really fancy systems like Siemens and BACnet, and you know all kinds of crazy energy management systems. I don't deal with any of the big fancy ones. A lot of my restaurants just use like the Bay web thermostats, not really a fan of them, but they do have a user interface that you can get onto if you have access to their system.

The only thing is, it makes it difficult for, let's say, for instance, we've got to do a preventive maintenance and we want to fire up all the AC systems. It's kind of a pain in the butt to have to call the energy management company and say: hey. Can you turn on AC number two and then they say well? Why? Because I'm working on it? Okay, can you do me a favor and turn it on for like two hours? Well, why two hours you know and then you got to kind of go through that stuff, whereas sometimes it's almost just as easy to jump the unit out. You know if the energy management company is not complaining.

There's a lot of you know you got to be careful because you don't want to ruin any of the energy management stats or anything like that, but yeah oftentimes. If I'm not getting a complaint from the energy management company and I'm doing a pee I'll, just go up and jump out the equipment, but you got to be very careful about jumping stuff out because you don't know what its gon na do to the EMS system. You don't want to mess any their stuff up. You don't want to be blamed, for it so be very cautious about ever jumping anything out without talking to the right people.

So all right HR there you go that's what it's called so all right. Let's see what else okay, so another question I had was on a walk-in freezer. What is the target evaporator temperature on a walk-in freezer, so it depends really on what you're trying to maintain. As far as box, temperature goes okay, so in a walk-in freezer for the most part, we're gon na go for a 10 degree temperature differential and that's the difference between the return air temp and the evaporator temperature.

Okay. So with that being said, if we know our system is designed with a 10 degree TD, I can predict what my suction pressure should be, because if I know what the box temperature is, then my evaporator temperature should theoretically be 10 degrees below that this all kind Of comes into play when the box is close to being down to temp. You do have to be careful, because when it's under a heavy load you could have a higher TD. If the expansion valve is flooding, it can change things, but once you get closer to box temp you can certainly predict.

So if I'm going for a negative 10 degrees box temperature, that's a typical freezer temperature that stores ice cream is negative 10. Then I can assume that my evaporator temperature is going to be negative 20, so you can find that on a temperature pressure chart and follow that over to the corresponding suction pressure, and it can give you an idea what your suction pressure should be. That's kind of a rule of thumb: okay, everybody designs their equipment differently, so you've got to be cautious about that. You don't want to just assume that's what it should be, but yeah you can use that as a rule of thumb.

Let's see what else we have! I'm making sure I'm not missing the equate any questions in here all right. It doesn't look like I'm missing too much all right. So another thing that I want to cover and let me go through this list, I'm just kind of looking at this. I got that.

I got that all right cool, yep, okay, so I covered that another thing I want to point out guys I get emails from you guys all time and sometimes their questions, sometimes their homeowners, sometimes their business owners. I don't mind helping out a homeowner now and then or a restaurant owner. I typically am NOT going to steer them into fixing their own equipment. I highly suggest that you call a service technician if you are a restaurant owner or homeowner, but I will answer questions to help them to understand things or sometimes I'll get a question from a homeowner.

Even though I don't do residential they'll say hey, I got a contractor out here and I just want to know if this guy's ripping me off and I'm not gon na say he's gon na rip you off, but I will say, hey you want to you know: They'll ask me the question and I'll kind of give him some advice, so I want to point something out. I have no problem answering your guys's questions and I'm gon na try to do this a little bit more in my streams. Okay, I don't want to mention your guys's names unless you guys tell me you want me to mention your name which, but whatever so I'm not gon na mention your names, but I'm typically gon na read your questions aloud and and I'll try to answer them, and It's not to make fun of you guys or anything like that, and I'm gon na point something out. So when you guys send me a question what I really really appreciate - and this goes with your service manager with anybody - is give me context.

Don't just ask me a question my contractor says the superheat slow. What does that mean? Give me context? What is the service call? Why did you call them? What is he telling you? You know what is his diagnosis, all this different stuff? Okay, so there's no stupid questions you know, but just give me context, give me your thought process if you're a service tech, that's asking me a question. Give me your thought process. Tell me what you think is going on, even if you think it's wrong.

Just tell me what you think and then we can work on that and I'll try to help you guys, I'm not promising that I'm gon na answer everybody's questions and I'm not promising that I'm gon na pick every question to talk about it on the stream. But I will try to pick a few and answer them. Okay, I'm gon na pick the questions that I think can help people whether it be you know just you guys know what I mean. So let me read this one right here, so this person asked me some questions about my video on the walk-in freezer with too low of super heat, and they said couple of questions.

If you don't mind that sightglass indicated moisture in the system - and this is their verbatim question - okay, it says that sightglass indicated moisture in the system, probably due leaks due to leaks over the years and charging without purging and whatnot. Wouldn't I want to change out the dryer before adding any gas. Also 404 is a blended refrigerant. Would you want to recover that gas and then add fresh 404 to ensure we didn't fraction eyes too much, or was the process to charge in some gas first and see if that cleared up, the temperature issue then put in for a bid to replace the drive Valve nut okay, so let's start this question at the beginning and - and I this is a good question - so first off a sight, glass doesn't indicate moisture per se.

Okay, there is a moisture indicator in the sight glass, but we weren't seeing that in my sight, glass. Okay and I'd be very cautious about using the moisture indicators in a sight glass. Typically, what we're looking for in a sight glass is bubbles. Okay, there is a little piece of paper that reacts to moisture in the system.