DISHWASHER EXHAUST NOT WORKING

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This was a service call on a dishwasher exhaust fan that was not working, I found that the fan was running when I arrived but I also found that the exhaust motor was going bad and the dishwasher was missing some curtains. I got the motor replaced and the fan back up and running as best as it could.
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Опубликовано:

4 окт 2024

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Комментарии : 255

@x_x_w_ 4 года назад

must have been awhile since the last fire inspection..... blocked access to electrical panel.... greeaaaa.t

@dangda-ww7de 4 года назад

NOt all of them will go up the roof for inspection, twice had my roof redone, and the inspector didnt even go up on the roof to check.

@alantorrance6153 4 года назад

I am a total "outsider" with a reasonable technical knowledge. This is a fascinating channel.

@FrozenHaxor 4 года назад

Disgusting place, one of the worst you have shown so far. Also disgusting maintenance practices on behalf of that restaurant. Unbelievable.

@phillippearl7053 4 года назад

FrozenHaxor it’s unfortunately pretty typical

@davejohnsonnola2758 4 года назад

Brother if you think that's the worst...I hate to burst your bubble... in the words of the immortal B.T.O...."You ain't seen nuthin yet"!

@perrybrown4985 4 года назад

Ha ha, my electrician Father used to do service work for a smallgoods factory ~50+ years ago and as a kid, I sometimes used to tag along. Everything in that place was dripping in grease, caked on all the motors, dripping off all the conduit and switches. If covers were removed, cockroaches would run out. Whenever my dad came back from that place, his overalls were disgusting and he smelt like salami - but, he would bring back all sorts of nice smallgoods - they made really nice sausages :-)

@ainzooalgown7589 4 года назад

@@perrybrown4985 those sausages had extra flavor from the disgusting stuff

@RodrigoRamirez-fc5hv 3 года назад

@@ainzooalgown7589 from the protein.

@peterhyams6824 4 года назад

I’ve never seen adjustable pulleys before. What a great idea. I spent the last 15 years as a commercial catering engineer and that dishwasher looked as though it was ready for a serious service. I used to replace bearings in motors if they were in good condition. I had an urgent call to a large school where the 3ph (415 volt between phases in the uk) dishwasher wash pump tripped. The main wash pump had seized solid. The head teacher threatened to shut the school if the DW wasn’t fixed due to cross infection risk until I pointed out that they could use paper plates! I got the pump out and back to the workshop and had to split the bearing with a grinder because it had welded itself onto the motor shaft. Fitted a new bearing and took it back to site and refitted the pump. I loved being able to provide that sort of service. I’m retired now but have lots of stories, like the restaurant that complained that their D/washer wasn’t taking the liquid detergent only the find the tube in a box of detergent powder!

@mick2171 2 года назад

You wrote an essay

@inothome 4 года назад

I didn't see it listed on the nameplate, but if the motor is thermally protected (internally) it could be going on and off if it was running hot or if the thermal switch was bad.

@TheFilthy13 3 года назад

You said in this video you like to spread your knowledge, then you said the little that you have !!! My brother you have a great wealth of knowledge !!! You experience and knowledge is worth your weight in gold. !! I have watch many of your videos and your problem solving, how your approach each job speaks volumes on your knowledge. You are a great and experience technician.

@HVACRVIDEOS 3 года назад

Thanks for the nice words bud

@TheFilthy13 3 года назад

@@HVACRVIDEOS Brother worked in Streetcars and Subway cars here in Toronto. The people I worked with over the years did not have the problem solving and drive that you have shown in these videos. Some of these people could not read a blueprint if their life dependent on it. Do not get me wrong I did find some people who did have great problem solving and a desire to repair the cars properly and to the manufacture settings, others did not care. I forgot to mention, this was a union enviroment, so time was not really an issue.

@Zachariahfml 4 года назад

Woah the rolling shutter on that motor sheave was tripping me out

@HVACRVIDEOS 4 года назад

I will be going live on RU-vid this evening 11/25/19 @ 5:PM (pacific time) to discuss my most recent uploads, and answer questions from email’s , RU-vid comments, and the Live chat come on over and check it out if you can. ru-vid.comlive

@ILOVECALGARY2024 2 года назад

I never knew dishwashers had exhaust fans thank you for the knowledge cool cooling man

@walkingfreak 4 года назад

That whole place is a dumpster fire. OSHA and inspectors should go through it with a fine tooth comb. someone would get slapped with a ton of fines.

@HVACRVIDEOS 4 года назад

@stevenaubin3362 3 года назад

You have certainly put some detail into that background. Nice Lego creations.

@MrSmithCasey 4 года назад

i know you hear this but i love your videos, i cant stop binge watching them LOL

@HVACRVIDEOS 4 года назад

Thanks bud

@syaz4380 4 года назад

Did you ask them why one of the exaust fans don't have power? (the one that didn't have any cables running)

@matthewrobertson3018 4 года назад

Hey! I shared your channel with my HVAC/R Class, everyone there loves your content, including our instructor. Keep up the great work!

@HVACRVIDEOS 4 года назад

Thanks so much!

@cantsolvesudokus 4 года назад

1:59 that motor is trying to change dimensions, that spindle is way to trippy :P

@Metalcastr 4 года назад

I like how detail oriented you are, and make the systems work great!

@stevenmoomey2115 4 года назад

I’d like to know who did the initial inspection? That’s the wrong Fan for a Dishwasher. Has to be an Updraft discharge, also has to have an external disconnect on the roof, so you don’t have to touch the fan to shut it off. Also Aluminum or Stainless Steel ductwork. Exhaust must be tapped into the entrance and exit of the dishwasher. A Dishwasher that size would have to have the controls to turn the fan on and off with a short time delay on the off cycle. Have you tried the Optibelt Brand of Belts. I wouldn’t use anything but their belts on exhaust fans. Six to twelve times the life out of the belt and easier on the motor amp. wise.

@shanenelson3778 4 года назад

First of all let me say I have been watching your channel for about 2 weeks now! I am a certified hvac/r tech went to and graduated a vocational school. Do some video on those low pressure controls in the box. The video you posted about one thing leads to another. You briefly talked about those low pressure controls.

@shanenelson3778 4 года назад

I also wanted to say I have learned alot from your videos in my last statement. Thanks

@SeanMackBuffaloStyle 4 года назад

Exhaust manufacturer told me a motor that is 1 hp or smaller, does not need motor starter protection, has internal protection. What's wierd like you said 3 phase for a dish exhaust? They should have used aluminum duct, crazy corrosion. Also the bottom of the hood should be no higher than 80 inches, maybe poor draw because too high?

@chemech 4 года назад

I can't say for certain without having the specifications for the dishwasher and the fan, but they don't appear to be matched up right... The fan static pressure is at *best* about 0.4 "wg, with a velocity pressure of ~1/2"wg I started running some pressure drop calculations, and they aren't adding up... nobody's paying me for the analysis, so I give up... it just doesn't look right...

@rookierefrigeration4357 4 года назад

It’s so funny that HVAC guys work in such a variety of equipment. Vent hood, RTU, refer, etc. I’ve worked on tool up doors, etc...

@HVACRVIDEOS 4 года назад

I know right we really have to have a basic understanding of most trades to be able to perform our daily job requirements

@gregmercil3968 4 года назад

A good variety keeps it interesting.

@HVACRNorth 4 года назад

Agree everything!!!

@gregmercil3968 4 года назад

Holy cluttered health code and safety violations! 😨

@binhashimhvacrservices284 4 года назад

It was a good one. Locked up. And try to inform the customer about the oil in the first fan, I can cuase fire.

@bobparrott8130 4 года назад

Your motor protection is bilt into the overload switch. (On/off). Which is located right at the unit 3phase switch. 👍

@treverkirk8110 4 года назад

I thought that too at first but now I'm not so sure. I've definitely seen manual motor start switches with a melting alloy element, it always been single phase motors, where only one element is needed. I dont think that switch had 3 melting alloy elements?

@martinwoods6716 4 года назад

Awesome Video, very detailed... Customer I work for uses Test & Balancing Company, there’s a lot to learn and do in our field....

@DonWestphal 4 года назад

With the curtains on the dishwasher you're correct there needs to be curtains. The entrance end is usually a little shorter to put racks in. When the curtains start getting super hard and curling they should be replaced.

@finno123456 4 года назад

So in the us and Canada you use 240v in industrial situations such a electrically driven motors. Then 110v in house hold sockets. In Ireland we use 110v in industrial such as a building site etc and 240v in homes

@StarGuardian8180 4 года назад

Welp since im a avid dishwasher. Also btw thats a Ecolab EC-44(HH) Beast machine they do last long if treated right. But if the machine doesn't have pant leg duct work. As long as the canopy can capture all the exhaust heat/vapor its good. Not sure why they have the opening for the vent like that with solid blockers. I've seen one machine with a setup like that. I hadn't gotten up and close to it so cant say that's typical, although the duct configuration I'm pretty sure inst.

@commercial_service 4 года назад

Good video. Talking my language. A Hobart made unit for ECOLab. The dish machine should have had pants legs and that would have prevented all that rust in the dish area. The customer didn’t want to pay for the extra cost to have it done. Surprised ECOLAB let that thing work in that way. The motor replacement info was good to know. Lots of clients expect me to work on their exhaust fans for their dish machines. I usually say no but now I might consider taking them on. A really good video.

@DonWestphal 4 года назад

I think that was an ECOLAB machine. I dont know of a Hobart with that kind of conveyor.

@commercial_service 4 года назад

Don Westphal Ecolab is a chemical company. They don’t even fully make their own pumps. Components include parts from Dema and Knight. Dishwashers used by Ecolab are: Hobart and Jackson. A while back they sold off their repair arm. You know it as Smart Care. All to focus on their core business.... chemicals.

@DonWestphal 4 года назад

Hmm never heard of Hobart owning ECOLAB or anything an i work for Hobart lol

@commercial_service 4 года назад

Don Westphal Hobart doesn’t own ECOlab. ECOlab buys machines from mfgs and they emboss the units with the Ecolab name. Buy enough from Hobart and they will stamp your name on the machines you buy too. ECOlab is a big customer of Hobart. I guess you were on the meat slicer side of things.

@DonWestphal 4 года назад

No i do it all im cross trained on all the equipment. I just dont too much into all the business side of things. I focus on troubleshooting the equipment and that's about it lol. I accepted a job to do HVAC recently and will start it in December so im trying to freshen up on a few things before hand

@StarGuardian8180 4 года назад

Yup on the curtains your correct. The machines typically don't control the fans above. Dish machine fans every place I've worked Run 24/7 unless its controlled elsewhere if any. Anyways appreciate your videos.

@ArlenMoulton2 4 года назад

I love your exhaust fan videos, we don't commonly have that style in the UK and they look so cool!

@etherealrose2139 4 года назад

That's a driven pulley. The motor drives the other shaft as it's the source of power. :) It isn't thermal protection built in to the 3 phase motor but it does make you wonder if something was causing a spike in amps and the breaker protected the motor (as well as the line) from overheating to catastrophic failure. Bad bearings, which that obviously had, would cause a higher current draw but it'd be most noticeable on startup and most likely to open the circuit then. I'd be curious if the driven shaft bearings are going out as well, causing more drag or perhaps the fan blades are messed up somehow (rust? chipping?)

@dtiydr 4 года назад

0:38 Dead body in the corner?

@dandfgarage986 4 года назад

I love how you use good Marathon motors.

@اغانيالزمنالجميل-ع6ز 4 года назад

Thanks for sharing your knowledge with us and thanks for putting the time

@kronosouranos9979 4 года назад

At the end of the video your eyes are red like crazy, like you just took a big bong hit lol

@treverkirk8110 4 года назад

Thanks for posting, interesting video to watch and you do a great job of explaining everything. I do want to point out a couple things though. EVERY motor has to have overload protection(not just three phase motors as you stated, sorry to nit-pick.) Its just a matter of if its thermally protected internally or utilizing external protection(overload relay). Now most motors if protected internally will have it printed on the nameplate. That is not an absolute rule, but generally holds true. If it does not explicitly state that it is protected internally then you have to assume it is not, unless you want to contact the OEM for clarification.

@HVACRVIDEOS 4 года назад

Thanks Trever and you made some great points!

@deanchapman6425 Месяц назад

Just love wet floors and working electrical.😮😮😮

@alvaroturrubiartes76 4 года назад

Dang that’s a good looking motor!

@criskhiri2452 4 года назад

thanks for the video

@metazare 4 года назад

Just like a building owner, cut corners everywhere you can and squeeze every cent. Who cares if the place bursts into flames? That's what insurance is for, right?

@corrigenda70 4 года назад

A very interesting episode because call outs to things that are working when you arrive must be the most difficult. Given the state of the place it makes you wonder how safe the place is. Do you have a duty to report such issues to health, safety and fire authorities??

@acrraideredward9773 4 года назад

Great video! Always learning from your experiences 👍👍

@HVACRVIDEOS 4 года назад

@coreyb4073 Год назад

We just had a roof vent motor overload and short to ground, ended up tripping the main 1600 amp ground fault and shutting down half the building. Going to have the electrician come back and put overloads on all the motors

@AFXGaming 4 года назад

That is an absolutely disgusting kitchen, remind me to never eat there

@gyrgrls 4 года назад

Psst! Don't tell them that they can save a nickel by installing return lines from the grease traps to the fat fryers.

@BOBKB3NZX 4 года назад

How curious. I wonder if the if there was am issue with the power coming in that agitated the motor. Maybe contactor stuck? Gotta hate intermittent failures. Keep the wedding band for off days, get a silicon ring. Almost lost my digit after a compressor toppled onto my hand. 😅

@HVACRVIDEOS 4 года назад

Yeah it's been a week since the call and no complaints..... the ring actually is a silicone Qalo ring, I havent worn a metal ring for at least 5 years now. Hell if I could do it all over again I wouldn't even waste the money on a metal ring and I would have just bought the silicone ring to start

@BOBKB3NZX 4 года назад

@@HVACRVIDEOS May be it just needed some love. Machines are creatures. Yeah I made that mistake and had to cut off an 18k gold ring and it wasn't easy. After being pinched. I went on a binge watch and I have to say, I love how you handle even an intermittent. I'm northern FL central and it's nothing short of a miracle the systems that actually run in my dirty city. 😂 looking forward to next vid.

@yukongoatslayer7383 4 года назад

Dude, I like your videos! I feel like you're giving me a free education in HVAC common sense. Lol, I'm just a dumb carpenter!

@cityscene121 4 года назад

When you "opened up" the motor pulley and adjusted the pulley by turning it in a ccw direction, I was wondering if your adjustment had to go to the next 'Flat' on the motor stem? It seems logical that the next flat would be the only place you could retighten, so in doing so the distance has to be a predetermined speed thus amp draw or am I way off? And were you being careful not to change the up/down position of the pulley on the motor shaft? Be brief I'll pick up on your answer. Thank you

@HVACRVIDEOS 4 года назад

Yeah you got the right idea you have to tighten on the flat spots and yes you have to watch the pulley alignment while adjusting so you dont create another issue by running them un aligned

@buixote 4 года назад

I used to make biodiesel, so I know about pumping grease from behind restaurants... never had to suck it out of an exhaust fan! ;-) Maybe the fan blades have disintegrated!

@jimmuo9286 3 года назад

Remind me never to eat at that restaurant!

@cornspace 4 года назад

Hvac Detective.

@J-Colt 4 года назад

My locker room exhaust did that just 2 weeks ago. I get a call after I get home. Woman says it sounds like a paper shredder going off every 10 15 min's for a couple minuets and stops. I knew that exhaust was over her office on roof. Of course it had been doing it all day but waited till I went home, lol. Next day I went up and took cover off. Turned power off and spun it by hand. Turned power back on and sure enough, ran for 1 min and sounded like paper shredder. Motor would over heat and shut down then turn back on for a min or so. Replaced motor.

@HVACRVIDEOS 4 года назад

@sandy1653 4 года назад

That one exhaust fan is just begging for an ugly grease fire on the roof there.

@HVACRVIDEOS 4 года назад

I know right......I will be going live on RU-vid this evening 11/25/19 @ 5:PM (pacific time) to discuss my most recent uploads, and answer questions from email’s , RU-vid comments, and the Live chat come on over and check it out if you can. ru-vid.comlive

@gbowne1 4 года назад

All the rust, thats why I put Fluid Film (tm) on a lot of stuff that you know will rust. This one looks really bad.

@punker4Real 4 года назад

always when the repair people show up it starts working

@KevinBenecke 4 года назад

Yep. Just like when you take your car to the mechanic because it is making a strange noise and then it doesn't make it once your there.

@pedrojardim1163 4 года назад

thanks chris --- i do share some of this videos with my freinds -and i hope to help u some how --bcose to watch some of ur videos it just the best to watch ---and helping mi to -----thank u so so much

@HVACRVIDEOS 4 года назад

@paulchamberlin5354 4 года назад

Good old GE... still just Running years after all others.

@chemech 4 года назад

Baldor and Hitachi also make pretty good motors...

@paulchamberlin5354 4 года назад

@@chemech GE made absolute indestructible ones though.

@Eddy63 4 года назад

Chris your vids are always good but I noticed they 're even better with a " STRONG" Bloody Mary ... Lol ... Very much appreciated ...

@jamestoy426 4 года назад

Learned a lot thanks for making videos

@phillippearl7053 4 года назад

Just a guess here but I’m thinking the motor has been cycling on heat .... they just happened to catch it on an “off cycle”. That would explain a lot. I have 250+ of these go through soon, lol wish me luck! 😑

@sterlingarcher46 4 года назад

Pretty amazing it didn't have an overload though, I don't understand why they'd do that , unless It was originally a smoke exhaust that was part of the fire extinguisher systm and they just used it for the dish washer and they didn't bother modifying it , but it wouls seem pretty low horsepower for that doesn't it?

@reza49363 4 года назад

Thank you

@Zonkotron 4 года назад

Why all the belting ? A fan could be engineered as direct drive so easily :/

@sportsman042002 3 года назад

Why is matching the amp draw important on replacement motors thank you in advance.

@Ted_E_Bear 4 года назад

Great instructional video !

@HVACRVIDEOS 4 года назад

Thanks, I will be going live on RU-vid this evening 11/25/19 @ 5:PM (pacific time) to discuss my most recent uploads, and answer questions from email’s , RU-vid comments, and the Live chat come on over and check it out if you can. ru-vid.comlive

@donnierobertson3088 4 года назад

Great job again like always always

@ljlittlej6500 4 года назад

Gravity dampers inside do get stickie and stuck with grease just below exhaust fan.

@AgentOffice 4 года назад

Nice ladder

@xeobit2781 4 года назад

Thank you good video

@lorenzo42p 4 года назад

I think you're reading the current draw on the motor label wrong. it's the lower number next to it. motor has different ways it can be wired

@Goesreallyfast 4 года назад

The nameplate information for amps is divided the same as the voltage above it. Rated Amp draw for 208-230V is 3.3-3.0A, and rated Amp draw for 460v is 1.5A.

@simonrichard9873 4 года назад

You were fine with the amps. Since it's 208 instead of 230 it will draw more for the same power output.

@lauej 4 года назад

The internal energy dissipation of a motor is the same for every voltage, with the same amperage

@Mrneal1027 2 года назад

Great job 👏

@DESUDESU24 2 года назад

I'm still curious what that disconnected fan was all about.

@fespinoza287 4 года назад

Good video 👍 What do you think about checking statics at the fan with a manometer before getting into the crawl space?

@SOU6900 4 года назад

I'm curious as to what you had blurred out when you first got up on the roof, but at the same time I probably dont want to know by the looks of that place. Also am I missing something or is the motor running backwards at 13:19?

@HVACRVIDEOS 4 года назад

I blurred out a box with a restaurant logo on it.... the motor looks like it is running backwards due to the camera shutter speed.... I will be going live on RU-vid this evening 2/17/20 @ 5:PM (pacific time) to discuss past videos and answer questions from RU-vid comments, Facebook comments, email’s and the Livechat, come on over and check it out. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-cTBXc_N4O1w.html

@SOU6900 4 года назад

@@HVACRVIDEOS Ah ok lol. Too bad I can't really watch the live stream. Gotta be in bed at 7 pm and up at quarter to 4...

@duaneroberson7447 4 года назад

Good Job 👍

@jannickcst 3 года назад

That new Motor you've installed is also made for European Voltages, but it says 190/380 instead of 240/415?

@SOURADEEPBISWAS 3 года назад

What have u blurred up?

@sK-hi3lb 4 года назад

Did it solve the excess steam being pushed out of dishwasher

@Jerry_SWMO 4 года назад

Curious, what did you blur out at 0:38 ?

@Jerry_SWMO 4 года назад

You "hearted" my question but you did not answer it. I enjoy your videos even though I know little about HVAC. I admire your work ethic as well as your video and editing skills. Keep up the good work, my friend.

@HVACRVIDEOS 4 года назад

I blurrred the name of the customer

@APECK636 4 года назад

I do hvac, but don't have much experience with belt driven things. How does turning that pulley on the spindle slow it down? Does it change the ratio?

@APECK636 4 года назад

So what is the answer?

@briandjordjevic9969 4 года назад

APECK618 magic 🧐

@HVACRVIDEOS 4 года назад

I will be discussing this on my livestream monday night

@harrydickson4575 4 года назад

Another great video 👍👍👍

@kelly00000111111 4 года назад

New sub here. Big fan of the channel. No pun intended. Ah ha ha ha.

@roadwolf2 4 года назад

Just a thought. To speed up the fan couldn’t you swap the pulley sizes

@TheLOD2010 4 года назад

You should see the grease trap of our local china snack bar. It is a steal pan on the floor under the fan. Pretty smelly and quiet dangerous.

@EastSqure 3 года назад

How does moving the pulley slow down the motor?

@jameslarusch2692 3 года назад

It's ecolab that's all I needed to see.

@martehoudesheldt5885 4 года назад

did you grease the pillow block bearings? (if not sealed) and that is a friction belt ( verses an auto style belt) it does not get tightened super tight as it will pull the bearings out of the new motor. did you never seize the shaft and the threads on the adjustable pulley so that you can get it apart in 6 months?

@chopperdt66 2 года назад

Looks like the junkyard for parts for exhaust fans. 😂 If you can even find a decent part of those units. 😂 Was this a condemned 🏫?😂

@jijzer3284 4 года назад

Please don t tell me where because i wil never go there after you showed the kitchen :)

@E.IS.M.I.A. 4 года назад

Did you go to college? If so for how long? I am starting out as a helper but I know literally nothing about electrical and VERY little about hvac, I’m trying to find ways other people learned the trade

@jrsmyth9761 4 года назад

You commented about the rust build up and presumed it had been happening for some time. Do you have any opinions on that now that you know there is more air moving? Was it always running too slow? Is it incorrectly sized? Just curious you thought on the rust you saw before and after repair.

@HVACRVIDEOS 4 года назад

Most dishwasher exhaust systems have stainless steel ducts coming down to the dish machine ( we call the pants) and that makes sure the steam goes right up the hood. In this situation they were using a hood 4-5 feet above the dish machine, if they had the stainless pants than they would not have the rust issues

@joedjordjevic5657 4 года назад

Great video as usual. I have a quick question for you in my restaurant one of the hood motors when it rains stops working and after while comes back on he's been doing that over a year only does that when it rains any other day works fine any idea what's wrong with the motor

@Eric12886 4 года назад

Does the R in HVACR stand for refrigeration

@HVACRVIDEOS 4 года назад

Yes it does

@onielonelka7875 4 года назад

Love your videos would really like to do this work

@vincetaylor3948 4 года назад

Can you explain why their needs to be an air balance

@r1cky42 4 года назад

How do you locate the contactor, controlling that motor if it is in a different room?

@HVACRVIDEOS 4 года назад

Kinda like where's waldo........ just make an educated guess, most of the time they are in the electrical room

@Paul-IE-Repairs 4 года назад

@@HVACRVIDEOS " electrical room" (aka the janitors closet)

@renton9999 4 года назад

time to call the city and have them do an inspection. you really shouldn't have any contactors inside breaker panels, water on the floor near panels is a major red flag, panels MUST have a 3 foot clearance in front of them (per fire and electrical code).

@amadeusrocks4967 4 года назад

wow good thing health dept has not seen that

@necessities-1235 2 года назад

Could I get a brief breakdown for SF on these types of motors same for condenser motors. Please and thank you

@birdbruh4131 4 года назад

You should get a go pro! You’ll be able to use both hands!

@HVACRVIDEOS 4 года назад

I have one but for whatever reason I dont use it that often, I will be going live on RU-vid this evening 11/25/19 @ 5:PM (pacific time) to discuss my most recent uploads, and answer questions from email’s , RU-vid comments, and the Live chat come on over and check it out if you can. ru-vid.comlive

@billingtonjr15 4 года назад

The framerates show the belt slip, good to know

@Bobherry 4 года назад

Chris what exactly is makeup air? I know it has something to do with + - air pressure.

@FrozenHaxor 4 года назад

It's air that is pulled from outside and forced inside by either a dedicated unit or by AC unit dampers, to "make up" for exhaust fans pulling the air out of the building etc. so that there is not a lower pressure on the inside of the building than outside which can lead to certain problems.

@jasonmurawski5877 4 года назад

When the exhaust fans pull air out of the building it reduces the pressure inside the building, so makeup air can be provided by a dedicated unit or the Minimum -outside air dampers on the AC units