 morning boys and girls. Today we're working on everybody's favorite make-up air unit. It's about 25 degrees, 22 degrees today, and it's blowing cold air into the building. So we're gonna find out what's going on with this thing. They said it's not tempering the air like it's supposed to. So when they kicked it on just now, I heard the belt squeal like a pig. So we're gonna dig into this thing and see what's going on. So I've done a video on this before. You can see one of those. Actually I've done two of them, I think. So like I said, this thing kicked on and it squawked, which it's not super loose, but it definitely is not as tight as it should be. This thing's fairly simple in design. You got a pressure switch system here that has to be right in the middle of what it's set for. So it can't be too low and it can't be too high. That's measured in a differential across the burner. The burner is right there. So the flame sensor and stuff inside there is a pilot system. They got a damper back behind that burner and these baffle plates right here and there can be adjusted to get the proper differential across the burner. So you got a high limit in here in case the blower quits, which is somewhere all the back over to here. Up and over. Where are you at? Now right there's the high limit, which does not feel like it's tripped. So good. This is your heating inlet air sensor. Basically it has to be at least the temperature that it's set at before it can run. Burner safety, pressure switches I talked about, variable gas valve, controller, and then variable gas valve and then your regulators. Some different transformers, blah blah blah. So let's go ahead and kick it on, see how about it squawks like a pig. So that's pretty loose. What we're probably gonna need, which we don't necessarily have to, we can get our pressure switch out and measure a differential across this pressure switch. But for right now let's go ahead and put the cover back on and run it and see what our lights show us as far as what's going on here. This is the burner controller I had on that steam boiler. Very popular. So if I have to, I can grab my controller, but generally don't need it. Today's plenty cold enough that it should be running. The temperature it tries to maintain is right here, which they've got it cranked all the way up to 78 degrees, which it's a little up there. And then here is your response time of how quickly it gets the temperature where you want it, as far as trying to hold it right in that area that it wants. So let's go ahead and kick this thing on, see what we got. All right, so the first thing we got is an alarm here. I could go grab the thing or we could just hit reset. It'll start over. It saves it in memory either way. Let's go ahead and reset it. See what happens here. Just clicked. Give it a second here. There's flame, pilot, name burner. This is for a kitchen, so I really don't believe we need to have it quite that hot. They probably prefer somewhere around at 65 at the most. We just basically don't want to add a lot of heat to the kitchen. Just want to neutralize it. I'll set it at about 55 degrees. That way you're still boiling 55-degree air. It's 15 degrees, 55-60. It just depends on what kind of people you got down there. You know, if it's warm-blooded, cold-blooded people, should be fine there. I mean, there it just kicked on. Pilots still staying on. The burner's on, so it's reduced down. You can hear it drop down. It's using temperature sensors in there to monitor the temperature that the discharge air is. I mean, it looks like there's a little bit of complications to it, but really it's not. The biggest thing is usually just maintaining it, which seems to be the case it never happens. So, let's go ahead and see if we can see a flame here. Usually there's an inspection port right there on the other side. Yeah, I can't see nothing in there. So this inspection port is pretty much useless. I went ahead and put a little bitty hole in it, which we can fill in. You can see right there what the flame sensor and the burner supply. You can tell we've got some disturbances there over on the right-hand side. So I'm going to clean that burner up. It may need adjusted to. You can see, like I said, they're on the right-hand side there. It just isn't quite where it should be at. I may go ahead and check the differential to to make sure we're good on that. See how it rotates down. It should not go all the way down to nothing on the right-hand side. So we've got some disturbances in there. We may need to clean those pilot holes, the burner holes. So what we can do is turn the main burner off at the gas stop and that's going to leave just the pilot gas go through. At least that's how the ones I've worked on before have been. See, we still have a pilot flame and main burner on, but the main piece here is off because they're bringing it in through the pilot system here and that can be adjusted. So let's go back and look at that again. See how it's not making it all the way across? It's not where it should be at. It should make it all the way across. So let's go ahead and do some clean up here real quick and see how it does. Go ahead and shut her down. We've obviously got the main off, so now she should be alright. Let's go ahead and shut it down. Go ahead and dig into that burner area, which is not real easy to get into, especially with the way this thing's set up. May have to crawl in in this area here. Here we go. So what you can see we're doing here is I am taking my light putting it behind there so you can see that all the holes seem to be clean. I've had times where the dirt has blocked the air holes behind it, so they're all clean. So I'm going to run a little undersized, and that's the key here, drill a bit in there to make sure those holes are open. You don't want to make the hole bigger and we'll get that cleaned out. We're going to clean that flame sensor up until that looks like crap. Probably get a better shot of that if I can get the light on there. You see that flame sensor looks like dog poop. So and then we'll check that differential pressure because that's important too. If you're not moving the right air across there, that'll screw with this thing. So I'm going to grab some small little drill bits and clean that thing up. Use my wire brush stainless steel wire brush to lightly clean that flame rod. Before we dig into that, I wanted to look at this pulley here. You can see it's pretty worn on the inside track here, which is probably why we're not gripping the belt very good. It's almost like straight-up and down type deal. That really should be replaced. See if we can get them to let us do that. Alright, so minimum burner, maximum burner. So that's the area we want to be within. So we're going to check and see there. We went ahead and cleaned up our orifices there. So we've got this clean and cleaned the flame sensor. So we're going to check this and see what we got. Alright, so our differential is 0.54. So I don't think our pressure switch is an issue unless our switches are acting up. So sometimes I'll usually come down here to a T, but we're not doing that today. Just easy sleazy lemon peasy. So like I said, we're pretty good there on that. So let's go ahead and kick this back on and see how our flame is. Maybe we'll adjust that. Alright, so it's still not making its way all the way across. So we're going to add a little bit of gas to it to make sure we're all the way across there. That way it lights off the way it should. So let's see if we can make an adjustment on that. Okay, our static pressure should be between 0.67 and 0.675. So we're just a touch low on that. Not a humongous deal. We're going to set the maximum and low fire rate, which you guys will need to look that up. I'm not going to show you how to do that. So we'll get that set. Alright, so we're checking our pilot. It's set right at the factory spec of three inches. So may try to do a small adjustment, but our minimum burner is kind of more what I'm thinking of here. So go ahead and get that. Maybe see if it makes an adjustment. It makes a difference, but if not, we'll go ahead and set it by the minimum to get a nice burner flame all the way across the burner. Okay, that's with the gas valve on and it's still not making its way all the way across. So as long as this is the same way that the other one was that I've worked on, that should be adjusted across. We've got to put it in its minimum position right now. Remove one of the wires from the modulating valve. So I'm going to double-check the instructions to make sure, but it should go all the way across. Yep, I'm correct. Proper minimum reach results in a small ribbon of continuous flame that covers the rod and runs across the entire burner. So let's go ahead and adjust that. Alright, go in the hole. Look at that. That looks pretty decent. I'm a little bit bigger and I want to be in that centerpiece, but that's, you know, that's about where they want it. It could be a little smaller. What that can cause is possibly a high temperature rise when you don't have a lot of call, but that's also why you don't bring it on when it's like mediocre temperatures out. So we've got that minimum position set. Now your high is going to be set based off of your discharge temperature, temperature rise, and that should be somewhere in there off the block, but I forget exactly what it's supposed to be. It'll be in the paper there. I got to look at it. It's probably like 70. I forget. I'll have to look it up, but that's about the only other thing. I'm gonna go grab my head and see what the code was it had. This does have a shutdown after so many minutes. It'll shut down the blower and just lock out or whatever. So actually just goes blank. I have to see if that's normal. I don't know if that's the freeze protection or what. So let's go ahead and run this thing for a bit and see what we get for temperature rise. All right, so we just turn it back on. See if we can see this thing kick on from the beginning to bring on the main burner. There's pilot and burners come on here. There's minimum and it should start modulating now. There it goes. So we'll check our temperature rise, see how that is. That's pretty much how these things work. So guys that have seen this before obviously find it too exciting, but I'm sure there's somebody out there may not have seen it before. All right, so there's one of my fingers are going numb. So we're 23 degrees. We'll see if I can poke a hole in here and get some temperatures. Okay, you can see it trying to modulate up to that 68 area. It overshoots it and it drops down. It's kind of got a little bit of a swing to it. It's not the fastest reacting in the world. You can adjust that on the shoulder a little bit. So that's about where I've got it set out here. About 60, actually about 65 to about 67, something like that. Here's your sensitivity right there. Increase, decrease, threaten the middle. Kind of looks like default. If you do it quicker, that'll make a response more, but then it can also act stupid. So we'll see what it does now. It's not like we're talking rocket science here. We're just trying to temper the air down there in the kitchen. So we're bringing in 23 degree air and we're going out with 60 something and we can put it and lock it into high fire and that's going to show us our absolute maximum rise. Like I said, I got to check this sheet here to see where we're at on that. All right, so design temp change basically rise 72. So 23 plus 72, that'd be your maximum temperature coming out of this thing. So we can put it in the maximum here in a second. Got to look and see how to do that because I forgot. All right, so doing a maximum set up here and obviously this is way overshooting. Coming out at 170 something. So that's definitely out of whack. Let's go look at our main burner. Oh yeah, that's not set up right. So we need to fix that. That is definitely not right. So yeah, 176 country limit here in a second. So need to adjust that. All right, so we made some adjustments on the regulator. 23 plus 72 comes out to like 95. I think it's what it came out being. So we've got it right in there at that. Basically just had to adjust the regulator to make it work. So we've got our high or minimum fixed. We had, like I said, had to get a wire off of the max control to force it into that. So we'll go ahead and put everything back together. Just need to check my code that I had. So we know at least now that, you know, under extreme circumstances or a malfunction that there's no way this thing will go extreme and cause any issues. We'll get these wires hooked back up and check that code. So far it's been running really good. And we'll kind of see what we got from there. All right, so we've got pilot flame, flame signal. So that's good. And we're at 1.25 and up for the flame signal. So we're doing good there. We're in here. Try to total cycles 20,000 times. Total hours 7,700. Fault history. Full cycle. 20,000 whatever hours. 28. Pilot flame fail. 19. Main flame ignition. Airflow switch. So that's kind of going back. So airflow, pilot, whatever. So basically flame sensor, gas pressure adjustments, you know, and belt issues have been the main issues. So from what I'm seeing, that's pretty much what we got in the history there. But unused history. So cool. What else do we got in here? Diagnostic info. There's the device. Something tells you your terminals. I mean, I don't do a whole lot, but flame signal in your history, I mean, that's about it. But that doesn't need that. I mean, that's just an extra. So you get to buy that separate. And it's not cheap. So here's my date code. Like I said, another eBay special, baby. I don't see a reason to pay the big money they want. I think it's like $350 or something for this thing. Now you can check the flame sensor down here with your DC bolt meter. But from what I'm seeing as of right now, everything's working right. We've got the temperature rise corrected. We've got the minimum set correctly. We've checked our pressure differential. We have got a pulley. We need to get the authorization, but I'll be here tomorrow if they authorize it. And we've got some adjustments made here as far as when it can come on. So everything seems to be working pretty good right now. I just got to call the guy and get that authorized. Otherwise, it seems to be working good right now. So I'm going to say we're pretty much done here. If you guys like the video and you want to see more like it, you know what to do. Until next time, we will catch you guys on the next one.