This video is brought to you by spore'ln quality, integrity and tradition. So I just wanted to start off and explain that I'm gon na start this video with a clip from another video that this is directly related to and it's an exhaust fan that I had a problem with and then I ended up going back and replacing that Exhaust fan, okay, so we'll go ahead and start with it and then I'll talk to you at the end of the video today we had a service call on an exhaust fan at a restaurant. It's not working! Oh, that's funny again the fans who started running the manager laid it on the ground because the fan wasn't working and I just came up here right now and it wasn't right in and then it just started all right. Well, I'm gon na dive into it.

Put the pan back on there and see what's going on, so I am back today, and this is the one where we had the electrical short and the wiring was all mess and the exhaust fan was laying on the ground. So came back out and we lifted a new exhaust fan up here. We had a crane out this morning lifted the fan up and for liability reasons. I can't really show the crane work, but I don't need every little person in picking how we're doing things and what's not correct and all that good stuff.

So so anyways we have a new fan up here. When we go back in with our fans, we put a super hinge on it. Okay, that's this hinge kit. It's made by a company called Omni containment.

I have no affiliation with them. We just love these hinges. They last forever they're amazing. This is the new design and the new design you don't even have to drill through the the curb it literally just pinches it so these go through and they pinch against it.

And then you just drill these down in and it's an awesome awesome hinge setup. We put those basically we replace this fan. We put them on that one and we've replaced that fan. So they are awesome hinges.

I highly suggest it they prevent stuff like this. You see this fan right here is buckling and that's because the crappy hinge that they come with ruins the fans. Look at that. So this will be our last fan.

Well, one of the last ones we have to change here. So when you put the super hinge on there, you can basically one hand and lift up the fan and it stops on the other end, nice and secure. You see that this goes underneath it. There awesome I'd highly suggest if you guys change fans, that you look up this company Omni containment and check out their super hinges, they're totally worth it.

So that's kind of something we selves a customer. Whatever we do, these exhaust fan installs. So one handed you can do it super easy all right, so we've got a fan in here they come unassembled, so I had to put the motor in I had to set the pulley had to put the switch in. I move the switch up to this L bracket right here, instead of mounting it down on the ground.

They come with this little MX connector, I'm not a fan of that, but you know I didn't quote to add anything else, so we bring new conduit in. I used the existing wiring because there was nothing wrong with it. Coming up. I actually shortened the conduit, so I'm gon na go and turn this bad boy on and we're allowed to run 4.7 amps, and so we're just going to check the amps right up in here.

Basically, we're out four point: three, when I close the pulley down one half turn more. I go to four point eight, so this is as high as I can do it without changing pulleys. Actually, though, you don't want to set the pulleys based off of amp draw, you just want to make sure that they're not over MP. Now I set this one to the identical setting that the old holy was set up.

You have to do that because of the building balance. Remember we don't ever adjust these pulleys to tighten the belt nor sheaves, whatever you want to call them. Okay, the adjustment on the sheave of the pulley is for the speed of the exhaust fan. It is not too tightly or loosen the belt.

Okay, I need to make that clear. You never adjust them to tighten the belt. You pull on the tension of the motor. Basically, so you loosen this and the next one and pull that out and type it down to adjust the tension on the motor whenever you're doing start up on these fans too, you always want to double check their tightness of the sheaves just to make sure - and I did so we are good everything's.

Looking straight, I'm gon na go ahead and make this connection. I usually do amp checks right here because a lot of times they're slacking the wire, and I can just go ahead and you know loosen it or tighten it. So I'll tighten that up we've got no need to support the conduit because it's you know, I basically made it as short as possible. You got to make sure that the conduits the right length so that way when you're, opening or closing or hinging the fans it doesn't impede on the hinge now.

Luckily, when I hinge this one, it's hinging this way so the conduit, so the length is needed for when it sets down flat. So I basically could just make it as short as possible to try to prevent drooping yeah, so we're good to go. This fan is good. It's set to the exact same setting.

That fan is identical. The wheel, the pulleys and everything are identical to the old fan. Now, if the new fan had different, pulleys or sheaves on it, or if the wheel was a different size, we would need to do airflow tests. Okay, if it's just a matter of pulleys, what you can do is you can use a tachometer and you can basically check the RPM on the driven shaft to see how fast it's spinning and you can set the RPM on the driven shaft to whatever the old One was at if it was running okay.

In this case, I didn't need to use a tachometer. I just basically set the pulley back to where the old one was because it was identical and the wheel size on the fan is identical to so that's pretty much. It guys so to finalize this exhaust fan, install we're gon na go ahead and replace this contactor with a traditional motor starter like this one right here, someone had disconnected the overload section before so I've got everything turned off: I've got, control, voltage and main power turned Off and I verified that so we're safe, I'm gon na go ahead and get this guy replaced. I've got the new one right here, we'll get it put together and then I'll show you what we got okay, so we have the new starter put in.

I set the amps for what I think it should be. I'm gon na go up and verify the motors run. Look it's all wired in. We have them wired.

So that way, if one starter trips it only trips that starter, it doesn't trip everything so just want to verify the fan rotation. It's correct. It was also an indicator down in there telling us it looks like we're allowed to run 4.7 amps. So I usually go ten percent over that so 0.47.

So four point seven. So what is that five and some change I'll do the math in a minute but yeah we're good cover back on and set the correct amperage on the overload all right. Four point: seven plus 0.47 is five point. One seven I've got it set there just past the five, but not quite to five and a half.

You know if you follow, there's a couple: different methods of setting over current protection, and usually I've read a lot where people want you to use the the safety factor. The sfa on the motor I like to go ten percent, it's probably a little low, but I like to err on the side of caution. You need to pay attention to the manufacturers equipment that you're working on different stuff requires different amperage settings. If you're working on critical equipment, you know you got to really pay attention to what you're doing okay and don't just trust some dude on YouTube, telling you what he does so all right.

So I want to explain you know, setting the overcurrent on those motor starters. You really really need to lean on the manufacturers and do what they say. Okay, there's a lot of different factors that can go into setting the overcurrent protection on a motor starter, there's a lot of different things that you can mess up too. Typically, the majority of the manufacturers out there going to tell you to use the service factor safety factor whatever you want to call it on the motor depending on the motor.

Sometimes you see them one point, two five one point you know I mean it just depends on whatever the motor says on the motors nameplate. Okay, things can change if you're dealing with a variable frequency driven motor, getting the amperages if you're dealing with a VFD can be a little tricky too often times. If you have a VFD, they tell you not to trust the amperage, that your meter reads and to use the amperage that the VFD itself sees. So you have to know how to get into the drive and view the parameters to see the current of the exact motor there's a lot of different factors.

Okay, so you guys need to do your research and you need to figure things out. Don't just trust like I said you know some dude on YouTube, telling you what to do. You guys really really need to figure this stuff out, because motor current protection setting up VFDs different things like that, if you do them wrong, they can lead to some serious issues. Okay, now I did mention that.

Typically, if I'm dealing with a electromechanical motor starter, like I showed in this video, I will typically set them about 10 % above the r-la of the motor. That's my personal preference. I typically don't have a lot of issues with that. Okay, but again you need to do what the manufacturer says to do.

You guys got to do your own research and make sure that you're setting them up correctly. If I'm dealing with a VFD like on a captive air unit, I'm gon na lean on the manufacturer. I'm gon na call captive air we're gon na, say hey. This is what we're dealing with.

What do you guys set the overcurrent at and they'll tell you where they want it set okay, same thing: if you're dealing with Greenheck, you know, I can't think of the other exhaust fan, companies names or anything like that. You want to lean on the manufacturers. Okay, inevitably it comes down to the motor manufacturer, but you also want to talk to the drive manufacturer. You know you got to do that.

Math yourself figure out what works for you, because, inevitably it's you, that's gon na be responsible. If you make a mistake when you're dealing with kitchen exhausts, you know I tend to lead on the side of caution and set it for 10 %. But if we get you know nuisance trips, then that's gon na lead to downtime for the kitchen. So you know I have to take responsibility.

So if I set that over current protection at 10 % above FLA, then you know if it trips as a nuisance like for no reason you know, then the customer can get upset with me and potentially you know they can come after me for lost revenue or Different things like that, okay, so you don't want to mess with that kind of stuff, and you want to make sure that you're doing everything correctly document everything be very, very safe, okay and be careful when you guys are working on these systems. Another thing I really really dig those those super hinges that I showed in the video okay, those again are made by a company called Omni, Omni containment or at least they're distributed by Omni containment. We've used them for years now, they're great great hinge device. They pretty much outlast the fan itself.

Okay, if they're installed correctly, so I highly suggest you guys put those things on there. They will eliminate the problems of the kerbs folding over like in this on this old exhaust fan. I mean they in you know they just take care of all those issues. Okay, I really appreciate you guys taking the time to watch these videos, give me some feedback down in the comments.

I want to know what you guys think: okay, where do you normally set your overcurrent protection on your motor starters? What do you guys go for what what documentation do you use to justify what you're doing when you're working on these systems? You know I've got all kinds of old motor books and it seems like if you read one you get one answer. If you read another, you get another answer, so that's why I kind of lean on the 10 % number remember. I do livestreams tentatively every Monday evening, work permitting meaning that if I'm not too busy I'll, definitely be on 5:00 p.m. Pacific time, and I usually talk about the videos, the stream answer, your guys's questions and all that good stuff.

Okay, so I really appreciate you guys taking the time to watch this and we will catch you on the next one: okay.