Electrical Diagnostic Thinking
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- Опубликовано: 28 май 2024
- Another livestream with Bryan and friends. This time they discuss Electrical Diagnostic Thinking. they cover history of electrical, blown fuses, circuits and more.
Read all the tech tips, take the quizzes
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Great Video! They never showed us these in tech school.
Probably you missed that class 😬😳🤣🤣🤣🤣
Sometimes the instructors are lousy, sometimes, alot of the times the students don't really pay attention. But usually the students who watch HVAC school regularly and comment on the videos, usually they pay attention and show up everyday lol. Or just about everyday
Brooooo thank you for making this. I'm amazed there is people out there just educating us for free. God bless.
Back in high school I had a teacher that told the story of a job he had that was putting himself through college, this was right after WWI, working as a part time apprentice electrician. Back then they were just starting to wire homes for electricity. The old guy that was training him didn't have a meter and would just grab the ends of the wire to check if it was live and was 110v or 220v, so he followed suit. After a few days he asked the old guy if there was a better way to check for voltage and they guy said, "Sure, you need one of those fancy meters." The cost back then was about two weeks wages. Two weeks later he had a meter.
I've heard stories of my friends in South America testing wires that way. Some teenagers would start working as Electricians and they would test with there hands. Insane.
@@christianolmeda938 On a serious note, back in 86 we had an employee that was electrocuted by another company installing a 110v motor in place of a 220v on a reach in box. The other company had wire nutted off one leg and grounded the motor to the case to get it to run. It is sad that the employee lost his life because the tech was to lazy to go back to the panel and take the other hot leg and tie it into the neutral bar. THIS IS WHY YOU ALWAYS CHECK FOR VOLTAGE, DON'T ASSUME.
A friend of my fathers would do that by touching the wires. He would have the current go across his body. Years later he suffered a heart attack on the job. We had heard that habit, was the cause of the HA.
And yet, an old veteran boiler mechanic. He would do it by touching thumb to pointer finger. He living today into his 90’s. 🤷🏼♂️🤷🏼♂️
A short causes an open,, you just blew my mind!
Great video. After 25 years of owning my own company and hiring techs fresh out of tech school that didn't know how to diagnose, I find myself teaching HVAC at a high school career-tech center. This video is the first "teacher" that teaches what I have found -- jumper wires, avoiding measuring to ground (I don't know how many guys, including experienced, that I had to explain that one to.), etc. My guys are singing the blues because I am making them draw schematics for their wiring boards that have all the furnace components they have to wire. Precursor to jumping into the real things shortly. Hopefully someday it will payoff for them. Keep up the good work.
Brian and crew, thank you for always providing good content. We appreciate it.
This was great. I do appliance repair but I always tune in to HVAC forums to sharpen my skills.
The Amps, Ohms, and Volts cartoon is so simple. I wish my instructor showed me this.
i really appreciate you guys and the way you conduct your training is fantastic. Coming from an otj training background,over the years now i have reverted back on my off time to try and "school" myself because i want to understand my job as well as possible to continue to do the best i can. your channel has been instrumental in so many ways in helping me to achieve that very thing. Ok so with that said, Thank You..really and keep up the awesome work. Love you guys!
Around the 30-minute mark you guys were discussing two pole contactors and crankcase heaters. If you look at carriers 38BRC models and a few other models, they were using two pole contactors and crankcase heaters factory-installed. What they were doing was placing the C (yellow) wire from the motor on L1 and the crankcase heater on L2 and allowing the CCH circuit to complete through the condenser fan motor. In a pinch I have used that method when replacing single pole contactors but of course best practice is always put back what you take out whenever possible.
I learned the physical diagnostic method fro my dad. He was born in the 60s
I did it and never believe I'd see it in print
Great presentation, love the visual aids, no room for misinterpretations.
I have downloading all your classes and has helped me. Many thanks 🙏
bring the need on brother!!! i learn every time you nerd! you explain crap so i can understand. thank god for rewind buttom cause you talk fast but just means you know what you’re efin talkin’ bout! keep rubbin’ out brutha!
Mechanical resistance to movement results in a bigger electrical load which means a larger current flow.
Wauy fr you went to Haiti man God bless you 🙏🏽1804💪🏽
Awesome video very informative, great job and thank you for taking the time to do these!!!!
Glad it was helpful!
Thank you so much bro! Deff missing the basics ! I appreciate you!
I’ve always checked a 9v battery with my tongue. Works. I’m 58
My laughs at me everytime she see me doing and won't let my child do it.
I like when you keep the comments of your students edited into the video 22:00 "Doug says this is a carrier, that's true, so they use magic"
What a great video man thank you.
Bryan I saw your guys down in South Florida. I didn’t know you come all the way down here.
Great job and video like always
My grandfather musta read this book his idea of teaching us not to touch wires was hey touch that wire tell me if its hot after a shock he would laugh at us kids and say wont do that again huh 😂
Had an uncle that would fix the lawnmower with the assistance of innocecent children holding on to the ungrounded spark plug wire
Good presentation, by the way.
Very great history
These are really useful.
Repetition is key. I’m a journeyman in my trade, changing careers, and currently in school. I’ve learned more in the field than I ever could in school. Yet with a trade like HVAC-R I can see why school is necessary, and mandatory in most cases. Thank you for your contribution to the community. Teaching others in my craft helped me learn much more than I ever could on my own. Iron sharpens iron.
Don’t pass up an opportunity to teach others, if and when it’s appropriate to do so.
Any chance you could speak to the political side of things in your industry? It’s important and not often talked about.
Things like calling to check in with employers, in between periods of work if you’re laid off. Relationship building, or demands of the industry. I imagine you have experiences that you’ve learned from, mistakes and successes.
Great Video!
Have you done this type of videos before? I really like this format.
Brian always trying to change the lingo of the trade🤣🤣🤣🤣🤣🤣 fancy words😬🤣🤣🤣🤣😎🍻🍻👍🏻
I love where he says current takes the easiest path but you need to remember it takes all paths !!! Its could to clarify this.
good to clarify this
At 31:30. Another option is to put the R wire on the other side of the contactor.
I can't wait for YT to get rid of the 👎button. I can't comprehend why anyone would give a thumbs down on this material.
Your dream came true snowflake. I understand why sometimes the down vote is annoying, but it is useful in many cases. If there is a REAALY bad video or one that doesn't make any sense or doesn't cover the topic or bad quality, you can see the bad rating before wasting your time. Now NOBODY ever can use it. Thanks a lot.
@@realSamAndrew Glad we were able to agree on something. What you got against snowflakes? Sounds like you do have some affection for snowflakes. Good thing, since they can change state. 👍
@@nsudatta-roy8154 as long as you change state when necessary, I have no problem. But eliminating the down button in EVERY state is like amputating your hand so it will never get burned if it touches the stove.
What you call a short "an undesigned low resistance path" is a short. Draw any circuit and draw in a short, then notice that the path for current is physically SHORTer than before. That's where the name shot comes from drawing a short into the diagram, shortens the diagram = short.
Thanks !
Me trying to learn basics:
"Teach me like I'm a Haitian"
great info
I was a supervisor at IAH airport in Houston TX had 3 cond fan mtr grounded out on a 25 ton air cool chiller and took out power to the bulding at customs office on July 4 2017 never see this kind of issues still wonder what happned
Yes sir my dad did it and I did it.
Taming the beast only 1 finger matters .
Who among us has not "tasted" a 9 volt battery to check for good/bad?
Hey Dave! Fancy finding YOU here!
Actually...after my forty years of troubleshooting (and teaching) electricity, I've STILL never done that. I never will either.
I have. Just a tingle. Old way to test with no meter as kids.
9 v? LoL. Been hit with 110 v more times than I can count on both hands. (nola native here)
I still do
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On the over amping subject, it is good to follow the manufacture instructions. However, it is not always wise to use the minimum and maximum allowable wires and breakers, just in case you might have to add something. That is why they have the maximum, just in case you need to use it. For instance, a motor is tripping you breaker, then you might want to go higher on you breaker but that is probably because you went minimum on you wire size, or your voltage in giving you issues. Instead of being 240 is, I don’t know, 210 maybe. You want to leave yourself some room play if you may. My opinion only.
Knowing the rules for parallel circuits will answer your path of least resistance. Rule is resistance in circuit is never more than the smallest resistor. Also, bolts stay the same throughout.
Just get this to Brian please.
Brian I just watched your electrical diagnosis thinking published April 1st 2020. I did not know another way to contact you about this idea I have.
In the voltage drop measurement section I have an idea for your cartoon.
You could have a conveyor belt with two different size boxes on it. A large box and a small box say a half size box. You could stack those boxes in series on the conveyor belt. Or you could stack the boxes on top of each other which would represent parallel.
it doesn't have to be extravagant but you could just use two boxes or just something simple.
Just an idea Hope it helps.
Thank you.
Energy =IV cos phase angle Your comments was you may use any higher voltage but same current I Dia agree foe the above reason
What's the name of the book you were reading from at the beginning of the video?
Ok I've spent the past 3 weeks watching every video but the newest 5. I'm a guitar maker, wood is more my thing & we're in wv so yeah we're all poor lol. Ok I moved into a house in November when my wife had surgery. Some dude stole the 45/5 cap out of our lennox hs29 with a crankcase heater. We turned it on, it arched. So i replaced the 45/5 cap but there's a horrendous buzz. the compressor came on but after about 10mins it began to buzz again. (It's coming from the contactor) I've tried about everything i have the ability to do. I even rewound the coil on the contactor & we tested it with 24 volts & it closed just fine. The buzz is like rattling, almost like it's just not getting the voltage & it keeps trying to connect causing it to buzz. So yeah , if there's any idea whats up I'd really appreciate it. Oh i replaced the relay aswell. It's a lennox hs29 2 caps 1 contactor (2poles) 1relay. Thanks man
HVAC SCHOOL, I'm confused when the Compressor windings are acting like a Wire compared to when the compressor windings are having an inductive field. You mention this in this video about the compressor windings can either be like a JUMPER Wire ( NOT having an inductive field ) in one operation/application and the other operation/application the compressor windings have an inductive field. Try making an YT lesson about this because its somewhat advanced how you look at the schematics of how compressor windings are function either with NO inductive field or with an inductive field.
This book should be around my dad's age....he would touch AC wires when diagnosing or working on house wiring for voltage and could tell how much voltage it was, LOL. I can say, don't do this and more so with DC high voltage.
2:54 That's what I thought! 🤭
Was that solenoid 240 Volts . Are they always 240 Volts on those reversing valves ?? Thanks for wonderful training.
What’s the different between 240v 3phase and 240v single phase ?
Different transformers. Different primary voltages and different number of feeds { hot legs } to and from the transformer. So what comes out of the transformer to the building is in one case 240v single phase. In the other 240 volt 3 phase. There are electronic gizmos available now that will , for instance allow you to run a 3 phase Bridgeport mill using residential 2 phase power. Don't ask how. It.s black magic. { Like those new fangled ECM motors in furnaces.}
Wow That's all I have to say.. They did that back then.
44:00 City inspectors in my part of town (California) will not pass that. 🤷♂️
The Air Conditioning Guy so n.e.c. Isn’t followed in California?
@@jeffb8437 I don't know, but when it comes to this, no.
Sometimes the liberals can be pretty conservative!
Sheesh…..should have went the HVACR route instead of electrical. Think I’d have found it more satisfying. Thank you!
Eye sight remedies
frankly I just ground out every circuit as soon as I start to work on it. In reality, im preforming a valueable test. failure to trip the breaker indicates circuit protection that is not working correctly. failure to arc at all indicates an improperly grounded circuit of a failing breaker. good luck preforming those tests with a multimeter. who hasnt touched wires to test em? if you don wanna put em in your mouth.. just lick your fingers first. works great on low volt. back in the day they didnt have access to generic flukes for $20....
we touched the wires and stuck them in our mouths back before we had electrical test equipment.
In the 80's when I worked as an electrican, the guys in the company often turned power on in order to shock us, just for laughs. 120v was usually no big deal, but the single phase of 480V (277V) almost always made guys scream or squeel. This made the guys want to compare the screams of various people. The best way to keep from getting blasted, was to condition yourself not to screem. This took lots of repititon, so the older guys would suggest testing circuits with our hands. A couple older guys would test 480V, phase to phase with their hands. Literally, most of us would purposely expose ourseves to 277V, just to condition ourselves not to scream. One guy got hung on the circuit eveytime he got blasted, this made my sick coworkers want to blast him more. To be clear, I do not reccomend getting shocked, or shocking others!
Had a friend electrician, old timer, he was touching the wires all the time. Some ten years ago, he was working on an overhead sing for a motel in West Hollywood. Standing on an aluminum ladder, he touched the wires for the last time. The doctor said he was dead before he hit the ground.
Brian, my daughter just said you sound like Conan O’Brien 📺
Haha... I can see that
It is a short not a shunt
According to the intro. Im a man now😎
I’m glad I was not a student at that time because I would’ve been roasted
1930.🥵💥
Cartoons in my head are of people shooting themselves in the head
Hi
😂😂😂😂😂😂
My cartoon for airflow is is the play dough head guy. Not enough play dough then he grows half a beard. Too much play dough and you can't push it through at all.
He would have a short career.