ELECTRICAL FAILURES ARE FUN
Рет қаралды 840,420
Күн бұрынSo I thought it was a bad circuit board but further investigation led me in a different direction.
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00:00 INTRO
02:11 WOW THE FILTERS ARE TOO CLEAN
03:41 BAD BOARD??
05:17 THAT'S JUST NOT RIGHT
09:07 WTF MOMENT #1
14:14 WTF MOMENT #2
15:31 PHASE ROTATION TEST
18:50 SLOW DOWN TURBO, YOU'RE NOT DONE YET....
19:50 NOT MY METER !
25:59 CLOSING WORDS
@fredrikfriisnielsen6243 2 жыл бұрын
As an electrician, I really appreciate the things you did for the guy that had to come and fix it. Its not every time I see that
@patrickd9551 11 ай бұрын
And yet, as a fellow electrician I immediately cringed when I saw the hookup to the main disconnect. Bare copper sticking out at varying lengths and no ferrule in sight. Not using ferrules at this day and age is just asking for problems, they are cheap, easy to crimp and they even ensure proper lengths so that no bare copper should or could stick out. The conduit run looked great, but it seemed they ran out of time when hooking up, cause that looked pretty shoddy.
@trevorgray3681 10 ай бұрын
In my experience doing data none of that info will get passed on to the next tech that comes out amd whoever it is will have to figure it all out again
@davewebster160 2 жыл бұрын
As a 25+ year fire alarm tech, I have to say I love videos like these from competent technicians, especially in sister trades. Great video! Liked and subscribed. Can wait to see more content. Well done sir.
@docbrownsradiolab1220 2 жыл бұрын
Hello there sir, I had something I was interested in asking you. My email is in the contact page of my channel if you felt like responding! Take care.
@winstonwright3613 2 жыл бұрын
Wow. An entire video where the equipment was all actually working correctly from a refrigeration standpoint. AMAZING considering what you usually have to fix. Great video. Thanks man!
@irdmoose 2 жыл бұрын
Dude, you are definitely the Louis Rossman of HVAC. Yeah, maybe there are technicians out there who are better, but almost none of them put their content out for ANYONE to see and learn from.
@MikeCarte 2 жыл бұрын
Being able to explain things verbally is a skill in itself!
@whoisderf 2 жыл бұрын
Not everyone has time or desire to create content after working long hours in the heat and smoke and other elements. 60+ hours per week is more than enough. Get home, kick off the boots, wash away the blood, sweat, and tears, have a hot meal and cold beer, and get some rest for the next day.
@irdmoose 2 жыл бұрын
@@whoisderf Exactly why his efforts to make these videos happen is so admirable.
@bradcloud7670 2 жыл бұрын
Just discovered this guy. Very impressed. I love the world we live in. Where pros show us their secrets and let us be these next generation jack of all trades.
@genome616 2 жыл бұрын
He made several errors in his testing methods, got incorrect readings due to those errors and luckily it headed him in he right direction anyway, this guy has enough knowledge to eventually get him to the problem but his failure to follow the prescribed test procedure we are taught could (and did) mislead him, to note also that his action of energising the unit before checking supply could in itself have fried certain components and PCB boards, I am an electrical engineer and I do this on all sorts of machinery for a living, machinery I sometimes have no working knowledge of, this guy seems to only deal with AC units so he should be more refined and follow a known procedure for the units which he failed to do.
@LazyLifeIFreak 2 жыл бұрын
Kudo's for having an apprentice and getting him some on hands experience with you in support. Best way to learn across all trade crafts.
@Suisfonia 2 жыл бұрын
From what I understand that's kind of how you start out within the field when your new, I'm hopefully going to be hired soon for an AC company and one of their requirements is to be teamed up with a veteran tech who shows you the ropes and how they do things. Even though I've already attended an hvac school (ATI) schools can only you prepare you for so much.
@danforsyth365 2 жыл бұрын
Chris, it’s been my experience that various embedded controllers will brick themselves if there is a power sag while they are starting up. (And with capacitors in their power supplies, a brief interruption shows up as a power sag.). I’ve experienced this with various network devices, especially consumer versions. I’m not a HVAC tech, so I can’t speak about those controllers, but these days, computers are computers. A power cycle is one of the first things we do. On a high quality controller, the power on self test will then tell you if there are hardware issues. But many times a reboot brings the device back to its senses again. Keep up the good work and try to get some rest.
@zacharynetzer819 2 жыл бұрын
A job like this also great for an apprentice to help with, any bizarre or nonstandard issue let’s the apprentice see how someone with experience will talks the problem. You can teach standard process all day long, but the best thing to teach is how to learn and discover.
@LazyLifeIFreak 2 жыл бұрын
@@zacharynetzer819 Learning by doing.
@tmst2199 2 жыл бұрын
@@danforsyth365 I've only heard the term brick mean "permanently ruined" such as w/ a failed firmware update essentially preventing further attempts. The term originated w/ hard drives serving new duty as door stops.
@neil2742 2 жыл бұрын
When the first unit burnt out there would have been an arc drawn. Arcs will produce a lot of EMI some of which will be conducted down the mains and may not be trapped by circuit protection as they will only be relatively small. The pulses can make their way through the transformer onto the circuit board and cause the lock up
@Zanthum 2 жыл бұрын
Almost exactly what I was going to say and better put.
@rogerlague1520 2 жыл бұрын
Well said
@kittyztigerz 2 жыл бұрын
once that connection blew out it sent out over voltages to other ac cause it lock down
@FrozenHaxor 2 жыл бұрын
Precisely. That thing would be a total spark gap radio scrambling the microprocessors.
@Johnnybytheway 2 жыл бұрын
I agree. There's an amazing amount of noise coming from an arcing connection.
@merseyless 2 жыл бұрын
I like that heartbeat led, easy to implement sanity check. If I ever make an industrial board I'll be sure to add one. Maybe some voltage indication LEDs if the accountants allow it :)
@andyhill242 2 жыл бұрын
Logic boards can be very sensitive to power glitches. It's always worth doing the Computer Engineer's Power Cycle reset first off if a logic board is behaving oddly.
@ryanmalin 2 жыл бұрын
especially if their not getting proper voltage from a improper wire connection
@Sovek86 2 жыл бұрын
Speaking from experience on this, either one of two things I would do. 1. Pull all the existing wire out, mark the burnt wire and replace that leg. 2. Pull existing wire and then refeed with entirely new wire. You are not going to be able to pull the single wire out in that conduit. Frankly speaking, that conduit is undersized for whats in there.
@Dje4321 11 ай бұрын
Entirely undersized. All conductors cannot exceed 40% of the conduit with exceptions for stuff like the whip-it style cable used as a replacement.
@mc-sp8zr 2 жыл бұрын
For all of the refrigerant and mechanical issues we deal with, I always appreciate these occasional electrical mysteries. It's so satisfying once you find the cause, especially if you've already narrowed it down before you laid eyes on it. Some of my go-to issues were the Trane Voyager disconnects that always wore out, and the York package units that ran the blower wire against a hard piece of angle steel and would rub through the jacket into a direct short.
@broken1965 2 жыл бұрын
That box hasn't been looked at in years, probably handyman electric lol
@rizashahril 9 ай бұрын
I'm a BMS/BAS guy and i love learning stuffs like this with the HVAC and Electrical guys whenever i got the chance. Doing T&C for new buildings gets me exposed to many new stuffs and it helps me to troubleshoot problems better. Not doing that anymore nowadays but troubleshooting problems gives you a kind of satisfaction that i dont really get with other jobs. Nice detailed video btw.
@danhei 2 жыл бұрын
Another stellar episode. My back ground is leather work. I do enjoy watching other people ply their trade and knowledge to solve and correct problems. Thanks for the videos.
@unavailablenumbers 2 жыл бұрын
IT: "Have you tried turning it off and on again?" HVAC: "Have you tried turning it off and on again?"
@donalddarbonne779 2 жыл бұрын
Bahaha!
@nakayle 2 жыл бұрын
A lot of problems can be fixed this way. Digital circuits 'crash' from power dips and must be 'rebooted'.
@kylemilford8758 2 жыл бұрын
Pretty standard for electronics
@tbelding 2 жыл бұрын
PC power supplies have a software 'circuit breaker' function. After some power surges, they'll lock into an 'off' mode, and you have to remove all power from the unit, let the residual power drain from the board (hold power button to short it, or wait 5-10 minutes for caps to drain), then plug back in. I've seen the same behaviour on computer controller boards in other equipment as well (phone systems, gate controllers, etc). So, it's a BIT more involved than a straight reboot, but when someone calls me about a system not powering up, I always tell them to unplug it from the wall for 10 minutes, then try again, and call me if it didn't work.
@eds6569 Жыл бұрын
Electrician not HVAC but I love content like this because it helps to know how other trades typically handle their side of the work so I can finish my work in a way that makes it easier for y'all after the fact just like you did by providing info ahead for the electrician (much appreciated). Me and our crew always try to think of the guys coming in after us regardless of their trade and I wish everyone did that.
@HVACRVIDEOS Жыл бұрын
If you haven't already watch this one.... kzfaq.info/get/bejne/rbB9nNyYnM3KfXU.html
@draconightwalker4964 2 жыл бұрын
that sparky did a decent job on that run ill bet the second unit saw a voltage drop for a second and locked out due to low voltage on one phase
@jman0870 2 жыл бұрын
That's unlikely. There is a higher chance of a brown out condition (it's California, after all) and those were the two units actively running. Unless your breaker for the first RTU failed to trip that is. Even then, it should trip the main for the building. It's very difficult for a single piece of equipment to brown out a building by itself (unless it's a factory. That's a whole different animal.)
@jman0870 2 жыл бұрын
@Demonitized Boi care to elaborate? Wires burn up during brownouts. Motors, boards, and transformers burn up during voltage spikes.
@PantherSerpahin 2 жыл бұрын
@@jman0870 and thats how you can burn stuff up. Low voltage means increased amps. So if its on a borderline connection due to age/corrosion/barely specced another 20 amps which would easily be drawn if the voltage dipped to say 170 volts from 210 on a 90 amp rated circuit you can end up with weird situations.
@jman0870 2 жыл бұрын
@@PantherSerpahin I literally said brown out condition dude. By brownout I meant building wide, not a brownout cause by a different RTU. That is highly unlikely and bordering on impossible.
@deaconwanderer2409 9 ай бұрын
I am a technician for a HVAC company in Florida(not going to promote where) with 17+ years in and you sir did a fantastic job diagnosing those units, along with letting your apprentice get hands on. My thought on what happened is when the one wire that was burnt, arced to ground and forced a short across that specific panel, which being in California didn't seem out of the ordinary, so nobody was the wiser, causing the other unit to sense a power issue, mostly sounds like coincidence that those 2 units were more than likely the only ones running at that moment and purely luck. Those L****x style units' boards are very sensitive, and give a lot of information, but are fairly stout boards, so I'm fairly sure your diagnoses is correct in that the board is likely ok, and just did its job.
@mallow399 2 жыл бұрын
Love the "not my meter" chapter. I use that as my back up meter, since I have watched the channel my truck its now full of fieldpieace tools! Keep the goods coming !
@manolotech1110 2 жыл бұрын
Any port in a storm!
@shannonhill3356 2 жыл бұрын
So glad my trade school provided a few small Fieldpiece tools to start with at graduation, as I hadn’t heard of them prior. Since then, it’s pretty much one of two brands I prefer to buy first choice (Navac being the other) - now that I’ve really started gathering my personal service tools.
@davemurphy8953 2 жыл бұрын
This is a perfect example, in my opinion, of why HVACR technicians are better at finding electrical faults and understanding complex circuits than most fully qualified electricians.
@walter5700 Жыл бұрын
As an electrician I just wanted to say kudos to you for doing so much leg work for the electrician! However the electrician himself did a shoddy job connecting the main switch. Copper wire NEVER should stick out so much out of the switch. Touch safety is blown out of the window with this one. It probably isn't that much of a deal because no one will ever need to work on that switch for a long time, but it just saddens me that people rush their work like that, a proper connection could have been the cherry on the cake. Amazing video though!
@briant9764 2 жыл бұрын
when i was a working man this kind of stuff always happened when i had 3 more calls to run. Your right fix it correctly or not at all. I had something like this happen. In ended i splice the wires and covering with electrical tape.We wanted a electrician to repair, but for some reason nothing was done for months. Finally i disconnected the electric and they had to get a electrician. But me being a hero could have caused lots of problems. Who would be responsible if someone got shocked, that would be me!
@samsimington5563 2 жыл бұрын
This may sound weird coming from a 17 year old who's considering being a wood worker but last night I rewired three of my (adoptive) great aunt's/uncle's touch lamps yesterday. I'm in Pennsylvania as a vacation and was supposed to go back to Illinois today, but the flight was canceled for an A/C issue with the plane; so now I'm stuck in PA for an eleventh day.
@SedatedByLife 2 жыл бұрын
There's just something about the three stage units and how they sound that I just love
@buckwilson4167 2 жыл бұрын
Man I gotta agree. Weve got a 30 ton Lennox like the one in the video for our lobby at a movie theater, it runs full tilt most of the time it's above the low-mid 80s outside and it's just really something to stand and listen to all 3 of those giant scroll compressors purring. The condenser drain is literally like a garden hose, just absolutely dumping water. Really something to see.
@JjMn1000 2 жыл бұрын
Not far from my house some people ripped apart a chiller. I will post details that I saw/assuming 2 compressor, carrier unit, 4 condenser fan motors, maybe 460v chiller, contactors were ripped apart but there were 2 3pole 200a breakers laying on the ground. Only thing remaining was a part of the metal frame and the condenser fan motors and holders. Edit: 30rb70 208v. There was a third breaker but it is broken apart. Pretty big unit!
@mark351 2 жыл бұрын
I probably mentioned this once before... My house has a heat pump system (mid-Atlantic). One winter's day I happened to be by my electrical panel and heard the HVAC backup heat relay click. I then started hearing ticking from the electrical panel. That's not good! Killed power, took the panel face off and found one of the breaker feed lug screws loose. Probably saved myself from a dangerous situation and expensive repair.
@Mikeydude001 2 жыл бұрын
If people were like you and listened and acted on weird noises in their equipment, cars, and so on, it would save so much on repairs and reduce hazards..
@ChrisCo0066 2 жыл бұрын
Dont mind the apprentice being there. Some of the info you give to them may not be in the video had they not been there. More info is never a bad thing. Keep up the good work.
@kuhrd 2 жыл бұрын
Looking at that electrical junction connection, I would say that the problem wasn't originally a loose connection but instead was corrosion. The splices were all made of aluminum from the looks of it and aluminum corrodes faster than any other metal. That is why you have to use oxygen barrier grease when you make connections from aluminum to any other metal including the bolts in the splice lugs. The corrosion over time caused the connection to go higher resistance and over time and thermal cycles caused it to meltdown.
@hgbugalou 2 жыл бұрын
This isn't true for any AL wire made in the last 30 years. Modern AL wire is an alloy that doesn't corrode like the old stuff. Using anti ox greas on it is pointless and a waste of money. NEC does not require it, and using it can actual be detrimental to the integrity of the splice.
@kuhrd 2 жыл бұрын
@@hgbugalou Well all I can say is that the Aluminum feeder wire in the main panel of my house is only 12 years old and it is already showing signs of oxidation and corrosion in a conditioned and heated space where the humidity is kept at or below 50% year round. The corrosion would be far worse in a junction box on a roof that is subjected to the elements. If you use the corrosion inhibiting grease according to the manufactures specifications it will only improve the splice. That is precisely why underground and outdoor rated splice kit connectors are often filled with the stuff (even when splicing copper).
@hgbugalou 2 жыл бұрын
@@kuhrd under ground is a completely different ball game. As far as your feeder, You either got cheap and or old wire or another factor involved. For example, anti ox is a good thing if your deal with buildings near the ocean.
@aldinardo4812 2 жыл бұрын
@@hgbugalou just wondering since when did Nec say no need for anti ox grease. We are still required to use it .
@etherealrose2139 2 жыл бұрын
Aluminum forms an oxide barrier faster than you can ever add grease. It's a thin layer that prevents further oxidation and corrosion, unlike iron rust that can keep penetrating further. However, aluminum, like most metals, can experience galvanic corrosion. It can also get pitted corrosion from stress (like maybe that tight space, bends, and the constant vibration of the AC unit) which will allow corrosion to go deeper than the surface. Then there is any acid or alkaline that can also cause chemical reactions and corrosion. Since Chris works the Inland Empire I would assume salt water spray is a non issue since that shit is all desert. That doesn't mean there can't be another element getting in that box. My guess is just a poor splice with constant vibration eventually caused it to fail. The only thing bugging me is the looks of corrosion going up into the jacket, that seems to suggest some high or low pH chemical was around it. Then again, maybe the constant heating up due to resistance building up did that.
@feynthefallen 9 ай бұрын
You, Sir, are a real craftsman like in the tales of old, when people wanted to be proud of what they do and didn't just klutz things together and write a bill. I salute your great work ethics.
@Eric-in2zb 2 жыл бұрын
Very professional! Hopefully the owner watched this video, because they should have noticed the way you diagnosed the system and handed off the duties, then came back to finish the duty bad ass! Thanks for this vid! We as HVAC-R techs are basically electricians but our responsibility is box to unit, electrician responsibility is pole to box! Obviously the unit not working is why you got the call, but this time it was the box great work!
@christophercoleman3162 2 жыл бұрын
Only legends watch the closing words part.
@ShukenFlash 2 жыл бұрын
As others have said, the shorting/arcing on the one AC could have affected the second AC. Breakers and fuses are mainly there to protect the wires against overcurrent. You can still get a lot of stuff past basic breakers. The short could have caused noise or voltage spikes/drops. Depending on if/how the wires touched and arced in that box it could have dragged voltage down on a leg or caused all sorts of weird power at the second AC. Especially if they're right next to each other in the main distribution board or a subpanel. Or maybe some combination of circumstances
@dennisolsson3119 2 жыл бұрын
When I check continuity to ground I like to start by putting both probes on the sheet metal. It ensures that the meter is in the correct mode and working and that the probe I keep on the same point for the rest of the testing has contact.
@Infowarrior-45 2 жыл бұрын
We've had several power issues here in NC in recent weeks. Had a Holiday Inn that blew a fuse in the disconnect in half for one unit, and fried control boards in two other units. Of course the power company will never admit fault, but power issues can cause an array of crazy issues.
@FerdinandFake 2 жыл бұрын
Got called for flickering lights in a cooling rack, turns out theres barely 200 v on the first phase coming into the main 100a breaker, when it should be 220-230. Still not sure whether it was the electrical companys fault or the building just added way too much stuff over the years to the point where the voltage drop was exessive
@HappilyHomicidalHooligan 2 жыл бұрын
This is why Surge Suppressors should be Mandatory equipment in all Main Distribution Panels so any Power Surges hitting the building from the Grid will get caught by the suppressor before it hits the building's equipment.
@hyperfluff_folf 2 жыл бұрын
Thats why our company (in germany) if I recall correctly even has power quality monitoring in place to proove that the problems initiated from the primary side of our transformer and not from our company internal grid...
@JjMn1000 2 жыл бұрын
Keep up these vids! Educational and entertaining! The short was not in an obvious place unlike the carrier units and the blower assemblies.
@possecomitatus77 2 жыл бұрын
Super awesome! I look forward to watching these videos like i anticipated watching GI Joe and Transformers when i got home from school as a kid.
@manolotech1110 2 жыл бұрын
Optimus Prime yeh baby!
@shannonhill3356 2 жыл бұрын
I love watching you work, my dude. I’ve been in the industry now for about 9mo, and have started considering what part I would like to get into as a niche, where I’m going to use my strengths, be my best at doing, and enjoy working the most. I enjoy all of it so far, but it’s the big commercial stuff that I find the most fun, and challenging, of what I’ve worked on thus far. Seeing you be so good and experienced at it, and rarely getting too frustrated (at least on camera 😏) has really got me thinking I’d like to start focusing my energies on the light commercial service side of things. I’d really need to up my electrical and refrigeration chops, but that’s all good. Thanks for being an inspiration and something to aspire to. Stay posting man, you’re doing some serious good for those of us just entering or thinking of joining the trade. COVID was a bit of a blessing in disguise for my work life and overall happiness. One. 🤙
@manolotech1110 2 жыл бұрын
Good luck in the HVAC trade!
@shannonhill3356 2 жыл бұрын
@@manolotech1110 Thanks, loving it so far! Trying my hand at service any and every chance I get, but so many installs around this time here in Florida 🤦🏻♂️🤙 I actually have to go finish up an install tomorrow, solo, then head to another install the crew will have started. Should prove interesting!
@gregmercil3968 2 жыл бұрын
A couple days ago I replaced a capacitor in a condensing unit. Pushed in the contactor to do what you call the bump start, verified that it works. Turned it on at the thermostat, the system went into what I thought was a very long delay. No 24v at the contactor coil whatsoever. Went inside to check the indoor unit, appeared to be plugged in, verified 120v at the outlet, then opened up the unit assuming I’d find a low voltage issue. The unit had no power whatsoever. Drove me insane for about 15 minutes not being able to figure out. I followed the plug into where it goes into the unit, only to discover that the cord was for the condensate pump. I looked down on the ground to see the actual cord for the unit, on the ground and unplugged (by the customer). Plugged it in and it ran just fine. Man I really wanted to slap myself after that. But in my defense, I was jelly brained from the heat, exhausted and 10 hours into my day. But I should’ve noticed that right away. 😂😂😂🤣🤣🤣
@mtucker3401 2 жыл бұрын
What kind of condenser are you working on that has a 120v plug??
@gregmercil3968 2 жыл бұрын
@@mtucker3401 this was a split system, and was referring to the indoor unit/furnace/air handler/ whatever the hell people call them. The condenser itself had a proper 240v supply. The contactor coil in the condenser wasn’t getting the 24v signal from the indoor unit which had no power because it was unplugged. Did I explain that well enough?
@manolotech1110 2 жыл бұрын
Remember: Don't b so hard on yourself, others will do it for you
@etherealrose2139 2 жыл бұрын
@@gregmercil3968 I think those tend to be hardwired as well but obviously indoor blower units and logic board power can vary. That's probably the confusion.
@gregmercil3968 2 жыл бұрын
@@etherealrose2139 long story short, the indoor unit was unplugged and took a few agonizing minutes to realize that this was why. I confused the condensate plug for the indoor unit’s plug. That whole day sucked! 🤣
@jameskaraganis2569 2 жыл бұрын
I was wondering if you'd grown a third arm. That would certainly come in handy.
@dapperbleach1598 11 ай бұрын
MAN i wish HVAC guys etc would work with electricians like this more often, makes the job so much easier and leaves less figuring to the job and makes it go smoother
@TechnicalLee 2 жыл бұрын
Circuit protection was oversized, Chris showed the max protection 90A on the equipment and they are using 125A fuses. Sat there and melted instead of blowing fuses.
@thomasandrews9355 2 жыл бұрын
Wow, actually checking the voltages at the transformers?! You were supposed to throw the parts cannon at it first...don't you know how this works? In all seriousness, great troubleshooting, sometimes we need to step back and go "anything else that can cause this issue?"
@ryanengle3188 2 жыл бұрын
lol you got me at parts cannon.
@shannonhill3356 2 жыл бұрын
@@ryanengle3188 lmao same. We say that around the office all the time cause some techs just love installing new stuff lol
@writersblock6376 2 жыл бұрын
i would have checked for voltage the moment i turned that disconnect back on.
@nowthatsfunny1 2 жыл бұрын
Good guys always check volts.
@Supsys 2 жыл бұрын
Thank you for this content. It is really helpful for me as a EEE student, I have learnt much more from your videos than I could ever learn in a lab.
@Legaleze 2 жыл бұрын
Fault finding is an art. You might now how to install and commission something, but finding faults requires a much more in depth knowledge of how it works. It’s a dance. This guy is amazing.
@Look_What_I_Did 10 ай бұрын
It is science. It is a methodology. Your lack of knowledge does not increase the complexity of the world around you.
@p.k.953 10 ай бұрын
I've never seen such a shiny looking group of PCBs 😅🤩
@tacocin 2 жыл бұрын
Love that Simpson 260 on top of storage rack in your office!
@tammywehner3269 Жыл бұрын
love to see the next gen getting great hands on experience. kudos to the whole program!!!
@n6mz 2 жыл бұрын
2:50 oh, those through-hole circuit boards are things of beauty. SO much more character than surface-mount!
@TheTruthKiwi Жыл бұрын
As a computer technician I love the old "Turn it off and on again" fix. Sometimes a restart/reset just refreshes the circuit and firmware and can fix many issues.
@dkd1228 2 жыл бұрын
Your apprentice is fortunate to have you as an instructor.
@thaddeustroyer 2 жыл бұрын
Never watched your channel, just showed up in my feed... thanks KZfaq. They say, "those that can't do, teach" and I must say that is true in most cases but you "can do AND teach while doing"! Very impressive, loved your logical approach and getting it right. Keep up the good work.
@shifter8207 2 жыл бұрын
I love when the customer "thinks" its a call back and plays those ntc games and attempts to hold you hostage because they question what you did and they have no understanding of how mecahical ac systems work😑😑
@christophergonzales1321 2 жыл бұрын
Do a video on dirty power
@jameslippincott 2 жыл бұрын
EXACTLY!
@etherealrose2139 2 жыл бұрын
"Fix it yourself. That means climbing up on the hot ass roof and verifying the other unit is off and the one worked on is purring along." Maybe that'll give them pause.
@psychiatry-is-eugenics Жыл бұрын
Hindsight , in a perfect world , he would have checked the other ac unit and got it running , instead of phlucking with power cables that he wasn’t going to fix .
@d1strappazon 2 жыл бұрын
That customer is so lucky they didn't burn their place down.. I work on garage doors and door openers and I've seen a garage burn down from a loose connection on the outlet going to a garage door opener. I cant believe it didnt fry that circuit board. I know that cant be cheap. Good work.
@HVACRVIDEOS 2 жыл бұрын
I will be going live on KZfaq this evening 9/6/21 @ 5:PM (pacific) to discuss my recent uploads and answer questions from the chat, Come over and check it out kzfaq.info/get/bejne/fsCae6SKubuwg6M.html
@HighlandSteam 11 ай бұрын
When doing a continuity check. I always retest the meter and probes at the end of the line of testing. So to confirm the meter is still working and readings confidence is high.
@kamranjutt9040 2 жыл бұрын
I work in kuwait as hvac technician. Here 90 percent of pcb board lockdown is caused by high pressure rise. Like outdoor fan malfunction filter dryer restrictions etc. Your videos are very informative 👍
@manolotech1110 2 жыл бұрын
Great video, as always. Really liked when you punted to the electrician. Way better idea to run seal-tite than snake #2awg thru EMT! PS your humility is what makes you freaking awesome 👍. Keep up the good work.
@DaimeanN 2 жыл бұрын
Usually you go around and check all the units to see if the fans are running or notice that something hasn't turned on, this time you didn't.
@FamiliarPresenc3 Жыл бұрын
First time viewer of your channel here.. This video was fantastic :D Loved it. Im an apprentice electrician, and it was cool to see how you went about troubleshooting electrical-related issues in the way that you did. Proper safety precautions, calm and collected, logical thinking by following the power back and testing certain things. I actually clicked onto this video thinking it was gonna be a compilation of random crazy electrical videos.
@honkhonklersr.4340 2 жыл бұрын
Good job on your analysis. I'm glad the board manufacturer took the time and expense to build in lockout circuitry for voltage sag/spikes. Maybe since they are rooftop units which have inherent issues with such things they added those safeties to the system. The hardware I use will plow thru the sags/spikes, which are very seldom in a BAS control panel at the floor level.
@sublimationman 2 жыл бұрын
I love watching your videos even though I have never been in your field. I was a coin op tech for around 40 years working on everything like candy machines, video games, juke boxes and even slot machines (and almost anything that takes coins or bills). I guess I like watching someone that knows what they are doing that is not a "Swapnition" (someone that just changes parts until it works) I myself was always lead in my field (last guy to be called when no one else could figure it out) and it's a joy to watch someone like that work through a problem. Another person might have just said oh, the LED's are flashing, must be the board and then changed it out (at I am assuming great expense) and then turned it on and validated their ability because hey, it works now.
@RDEnduro Жыл бұрын
At 1:30 i thought "this guys so good he's got three hands". Really good work and safe work nice job
@jonw7760 2 жыл бұрын
Really appreciate your professionalism! It's something you don't see a lot of these days. It's always not their problem or just don't want to do their job.
@brunoxing9060 2 жыл бұрын
We've got a problem You know that's a good video when they start like this. Greats from Portugal, Stay Safe!
@JjMn1000 2 жыл бұрын
Yes
@EF3078 2 жыл бұрын
no wonder the poor thing's heart monitor light was lit like that, the poor thing was having a stroke lol.
@Mike-bt5qy 2 жыл бұрын
Thank you for uploading these videos! I'm learning a lot and I'm very grateful. Watched the video from beginning to end and plan to buy some merch too! Keep up the great work✌🏼
@RubenKelevra 2 жыл бұрын
Well, doesn't matter what the unit uses as max amperage, this only defines how large the unit's breaker is. The fuses in the fuse box below the roof define how large the wire needs to be or they need to be sized lower. But this might not be future proof, that's why most customers run larger wires to the roof and have a smaller breaker there. :)
@simplemechanics246 2 жыл бұрын
It is good industry practice to have a bigger wires. Some units runs 24/7 (not on that video or location...) and these wires can heat up. Bigger cross section helps to avoid that kind of trouble. Cost is higher so typically nobody does not take a extra care
@darkwater72 2 жыл бұрын
I've seen oversized wire in installation for two main reasons. 1) Future proofing, as mentioned above. 2) Less voltage drop/ improved safety factor.
@RubenKelevra 2 жыл бұрын
@@darkwater72 how does a larger diameter increase safety? 🤔
@RubenKelevra 2 жыл бұрын
@@simplemechanics246 well, this only makes sense if the wire is the same size from the grid right to the consumers. This isn't the case here. Instead the wires are stepped down on each breaker.
@darkwater72 2 жыл бұрын
@@RubenKelevra A larger diameter translates into more conductor. More conductor means less resistance. Less resistance means 1) less voltage drop, and 2) less heat generated within the conductor.
@fredflintstone8048 2 жыл бұрын
It looks like the lug that was used for splicing the wire is aluminum.. That's a huge NO NO. Aluminum expands and contracts dramatically due to temperature changes, it's also a dissimilar metal to the copper wire. It was a very poor choice for the splice, it should have been made of copper instead. Expansion and contraction cycles over time caused it to loosen, and then become a hot spot further exacerbating the problem, and in addition to all this aluminum has a lower temperature melting point. Aluminum wire, aluminum lugs, copper clad aluminum wire are cheap alternatives to copper but pretty much all fail in the long run.. CCA or copper clad aluminum wire is showing up more often today. Avoid it because the aluminum at the core can oxidize causing it to turn to powder, and at some point the wire will fail because the copper clad surface cannot carry the current alone. If you're maintaining or repairing equipment that is fed with aluminum wire, do your customer a favor. Keep a container of noalox on your truck or van. Back the screws out of the connection, pull out the wires if you can and use a small brush to thoroughly cover the wire strands with noalox, also coat the screw threads because if the lugs are also aluminum, the screws can bind in the threads due to the tendency of threads to gall in aluminum. Tighten everything down properly and it will be fine for several decades to come.
@manolotech1110 2 жыл бұрын
CCA huh?
@funnycatvideos5490 2 жыл бұрын
exactly, you can oversize any wire as long as you use the correct breaker and fuses for the unit.
@robkaos 2 жыл бұрын
Noalox.....
@tbelding 2 жыл бұрын
Aluminum expands and contracts, yes, but this isn't aluminum wire used with non-tension connections. This is copper wire with aluminum connector blocks, with iron screw points. I've seen these stay solid for decades. CCA is okay, depending on the usage. For example, my car jumper/booster cables are 4 gauge CCA. It let me have longer cables for a lower price, and the amount of usage isn't going to make me run into the 'aluminum wire shorts' problem. CCA is even okay for network cabling - if you have the right connectors (which not much does). It's just a royal PITA to work with afterwards, especially if it's not labeled as such. You shouldn't get progressive oxidation in the aluminum core of wires, unless the copper layer has been compromised (that's a different problem), or it's a really poor grade of aluminum. Remember, aluminum is insanely reactive. If it didn't corrode instantly upon exposure with the air, it would burst into flame (like lithium or sodium). So it always already _has_ an oxide layer as soon as it's plated with copper. it's just that there shouldn't be any further reaction due to the copper coating.
@fredflintstone8048 2 жыл бұрын
@@tbelding What I said about aluminum is still the case, whether it be the wires OR the lugs. Lugs will expand and contract due to temperature change more than other materials. My experience is that there are very few panels, buss bars etc that will actually use aluminum, plus the fact that it's a soft metal and prone to galling of the threads of any set screws regardless of the materials they're made of. My experience of working in the trade for many decades is that most lugs are some kind of copper alloy with a cadmium plating to protect against oxidation. Perhaps what you 'thought' was aluminum lugs were really cadmium plated copper or some other copper alloy which is quite stable regarding expansion and contraction rates due to thermal causes. I've never ever seen any wire splicing lugs, split bolts etc that were made of aluminum. That would be madness, and welcoming a failure.
@rodgraff1782 Жыл бұрын
Instead of a continuity test with an ohmmeter, I use a megger. It will pick up shorts to ground that a 9 volt battery can’t find. It will also catch intermittent shorts such as a bare wire in close proximity to ground. A meggers high voltage will cause it to arc to ground.
@dr.haroldweinstein5157 2 жыл бұрын
I don’t even work any trades and I thought this was a cool video of things exploding. Now I can’t turn it off 🤦🏻♂️ good job!
@slitaitana6212 2 жыл бұрын
This channel is super interesting. Never thought AC servicing would be this cool. side note: i have the exact same boxes as you.
@joshc8599 2 жыл бұрын
Glad to see that you are taking the time for hands on training of someone else giving your knowledge and still making videos.
@randacnam7321 2 жыл бұрын
For the new junction box for the stub up on the first unit you fixed (unit 4), you want to block off the holes on the back of the box to dissuade flying stinging things from nesting in it. Also helps with preventing water ingress.
@phillipweathers2826 Жыл бұрын
like your videos they help me a lot looking for things I tend to overlook.
@krakenwoodfloorservicemcma5975 2 жыл бұрын
Awesome vid. I repaired locomotives electrical systems for 12 years. We ran into all types of problems like this.
@SproutyPottedPlant 2 жыл бұрын
I’m a bit late but best video yet! Interesting electrical fault, PCB glitched and the awesome sound of 3 stages starting up 😀👍
@PapasDino 2 жыл бұрын
Sunday mornings with Chris, what else can I ask for? ;-) Thanks!
@leslie-ub7mk Жыл бұрын
excellent technician you do good work remember quality is better than quantity. slow down be safe and live long
@jussikuusela7345 2 жыл бұрын
An arcing mains connection can induce highish voltage to the transformer secondary and raise a lot of hell on digital boards.
@billsmith3195 2 жыл бұрын
Brilliant video. Thank you.
@johnwood702 2 жыл бұрын
I am a 72 yo from Australia relatively new to this channel and I am interested as i spent many years in the industry ranging from an heating tech, Air-conditioning, refrigeration, mechanical services as a whole as installer to design to engineer. I am amazed at the equipment and accessible information you now available to you. I do find that design for restaurants would not meet Australian codes and the lack of through being put into equipment installation and placement to reduce the effect of kitchen exhaust being drawn into the units. Having been on both sides I always endeavoured to designing to minimise maintenance issue. You certainly do a great job and I thank you how you pass on your experience to others in the industry that are willing to login and listen.
@Fosuya 2 жыл бұрын
I'm loving the format with the apprentice ☺️
@cancorp29 2 жыл бұрын
The one "thumbs down" must be a competitor of yours hahaha! Well done as always, brother! You're a brilliant tech.
@forceablepizza764 2 жыл бұрын
when our equipment loses heart beat, cops gets sent to site, usually because someone wrapped a chain around the atm and drove off, very annoying
@Brett3am 10 ай бұрын
I used to know a maintenance assistant that would use old dental tools to straighten chiller fins on huge roof top AC units in an OCD fashion lol.... maybe the same guy.
@willernst8376 2 жыл бұрын
You are right that that board is messed up. The heartbeat is generally done with a piece of code running on the microcontroler, a watchdog timer or an interrupt. If none of that low level stuff can run, and you don't see a heart beat, the microcontroller is not working. These micros can do thousands or millions of calculations between heartbeats, so if it can't manage to blink a LED, it has crashed. I would also guess that lightning messed up all of those boards or caused them to crash. Great video by the way.
@brucehollmig4738 2 жыл бұрын
It’s nice to see a pro in action. Great job
@mattb90210 2 жыл бұрын
I am a general handy-man, and this stuff is way above my skill set. I want to tell you how much I enjoyed the video. Your pleasant voice and logical process was informative and enjoyable. There are a lot of videos out there with good information, but many have presentations that are annoying and distracting. There is not much on KZfaq that will make me sit and pay attention for over 30 minutes!
@The98deville 2 жыл бұрын
Another great start to a Sunday! Thanks for another great video!
@Chris-vc6bn 2 жыл бұрын
That’s a pain but that connection was toast, love the videos keep them coming 👍👍👍👍
@ThatFlyinRyan Жыл бұрын
Thanks for doing what you do I enjoy watching your clips
@mummabear01 2 жыл бұрын
I am learning lots of stuff watching you. I love your OCD work ethic.
@mummabear01 2 жыл бұрын
I could use a little education on what superheating is.
@laceybarbee5553 2 жыл бұрын
Man, that was a rollercoaster from start to finish.
@gbinman 2 жыл бұрын
Again, I appreciate your diagnostic approach. My career was in emergency medicine (earlier in automechanics) and later I added a career in computer networking. My point is that the same set of skills works in all of them. Big picture, cause before complaint. It's understanding the process. It applies in many disciplines, probably all. In each understanding the components is important but the process is the same.
@HVACGUY 2 жыл бұрын
Nice video. Connecting that wire after having to cut it back surely wasn’t easy.
@iceheye 10 ай бұрын
LUCKY!!!!!! ive heard bad stories about people kneeling down and touch the unit and that was the end!!!!!
@lineswine 2 жыл бұрын
A real working man with real talent. Hats off to you.
@jefferygrady3181 2 жыл бұрын
Great trouble shooting! Starting at the most likely till you found the problem! Agree with your decision to have the electrician do the wires while you concentrate on HVAC calls! Work smart not hard and get more done and make more money!
@MaZderMind 2 жыл бұрын
Such an Arc will create enormous High Frequency Content on the Lines which can travel upwards through the breakers and onto different branches of the electical system. It can affect other devices, sometimes even other buildings if the event is large enough. Usually such content is filtered with caps and filters on the input side of the power supplies but they age and it‘s also dependent on length of the cable runs. So I can totally imagine how the meltdown could trigger a power fault on the electronics of the other system, while not affecting all systems on the roof.
@Coffreek 2 жыл бұрын
It's tough to get business and finance guys to understand what a cap bank is for, since the up-front cost is so large, and their statistics classes told them these "one in a hundred-thousand" catastrophic failures are why we pay insurance premiums. Prevention? That's not cost-effective!
@manolotech1110 2 жыл бұрын
NASA scientist?
@TheJmich2001 2 жыл бұрын
IMO great call! I don't sweep the floors, I don't expect the custodian to repair an issue. We all have our specialties and time is non-replaceable !
@HVACRVIDEOS 2 жыл бұрын
I will discuss this on my Livestream this evening 8/2/21 @ 5:PM (pacific) on KZfaq come over and check it out kzfaq.info/get/bejne/erOUlseCxqyRm4k.html
@NuriBass69 Жыл бұрын
Honestly, thanks for making these videos. I've nothing to do with electronics but this shit is just way too interesting. Love the way you comment on everything.
@WhoFlungPoo2024 2 жыл бұрын
Not a pro tech but have had enough experience, as a union stagehand, with 3-phase. Your meter work on verifying voltage and continuity is a lesson for all of us. Can't believe power was still getting through the offending box. Great video!
@liam3284 Жыл бұрын
two legs were ok, third was open, so there was a "series" connection between the open leg and the other two.
@necrisuni Жыл бұрын
- "Hey, my AC ain't working." - "Have you tried turning it off and on again?"
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