A Strange Contactor Issue

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  • Опубликовано: 22 ноя 2024

Комментарии • 109

  • @jeffb8437
    @jeffb8437 4 года назад +6

    Interesting find. Thanks for sharing.

  • @jeffreykreft5442
    @jeffreykreft5442 4 года назад +15

    I’m not trying to be a smart ass here, but as soon as I seen how the contactor looked I knew it was bad, seen enough of these burnt contractors to know that this one is either failing, or will be causing problems soon. When I see these like this, it is an automatic change out for me.

    • @countryfriedhvac
      @countryfriedhvac 4 года назад +3

      Yeah that thing is just a variable in the equation that can easily be eliminated by replacing it.

    • @kenji369
      @kenji369 4 года назад +3

      Yes let's make a mountain out of a molehill the contactor is bad obviously just replace it and move the fuck on

    • @utubedestroysmytime
      @utubedestroysmytime 4 года назад +1

      Especially considering this thing is $30 max. I just switched out a carrier infinity compressor that was 2500 wholesale . Replacing a rinkidink control is easy

    • @jeffreykreft5442
      @jeffreykreft5442 4 года назад +2

      utubedestroysmytime agree, not worth burning up a compressor, “WHEN IN DOUBT, CHANGE IT OUT” always been my philosophy and has served me well!

  • @paulrozinski1488
    @paulrozinski1488 4 года назад +2

    It must have been a slow day because on a busy day, that contractor would have been labeled “dumpster food “ in about 0.005 seconds just by looking at it. Still, it’s a good learning experience, thank you guys!

  • @jimgill5706
    @jimgill5706 4 года назад +12

    I went on a no air call in Roswell, GA in 1975. It was a 5 ton Carrier condensing unit with a semi-hermetic compressor. The 60 amp breaker in the main panel was tripped. I reset it and thoroughly checked everything including ohming the compressor and fan motor with a Simpson260 meter on the 10,000 scale. I didn't have a megger back then. The house belonged to a friend of my boss and it was about 25 miles from the shop. Atlanta traffic. I left the call in the afternoon with the system running like a top. The next day my boss sent me back saying the A/C was out again. Same problem. I rechecked everything outside and the indoor blower motor as well. I was there for quite a while and again the system was running perfectly when I left. I got the information on the breaker so that I could replace it if it tripped again. A day or so later it happened again and I went back. My boss didn't have the breaker yet but said he would pick one up and bring it to me. This time I left my Amprobe clipped on and just watched it. Within an hour or so the condensing unit lost power with no amp rise. Maybe it was in the wiring? I disconnected the whip and pulled out the three #8 wires. Someone had stripped about a foot of insulation off of all three wires on one side and there was a small arc mark between two of them. My boss brought new wire and that was that. We work in a very interesting trade.

    • @werquantum
      @werquantum Год назад

      That’s insane. Sabotage?

  • @marvinostman522
    @marvinostman522 4 года назад +10

    Never head of it with contactor but do remember my Dad and Grandpa talking about getting carbon traces in the old automotive distributor caps. It would cause miss fires and all kinds of other pther problems.

  • @GlenS123
    @GlenS123 4 года назад +2

    Have only seen this a few times in over 20 years. Flows through carbon, but will continue even after cleaning it off. Never found a study addressing problem. Replace and good to go. Great video!

  • @JuanTodoli
    @JuanTodoli 4 года назад +2

    Nice find.

  • @curtisroberts9137
    @curtisroberts9137 4 года назад +2

    Neat video. You see carbon tracking a lot in automotive spark plugs because your dealing with Kilovolts. Any problem with the insulation like cracked porcelain or a pinhole in a boot can allow that spark to find an easier path than the combustion chamber. Then each time it happens the carbon trace gets bigger leaving an easier path to ground. I love this kind of video where you get to see those rare problems isolated and learn something new. Thanks fellas.

    • @flybyairplane3528
      @flybyairplane3528 4 года назад +2

      Curtis Roberts same happens with the insulators on an oil. Gas ignition electrodes ! Cracks you CANT SEE except from the high voltage makes it visible , cheers 🇺🇸🇺🇸🇺🇸🇺🇸

  • @randymack1782
    @randymack1782 4 года назад +2

    TY, & any old school auto-mechanic knows about carbon tracking, distributor caps were common issue for misfires, with voltage following a new path to wrong terminal, ground, coil lead, etc, so makes good sense to me, but we are talking 20K volts or more on secondary side of ignition circuit, but I am only learning this field. but glad to know it really can be an issue here too.

  • @jkbrown5496
    @jkbrown5496 4 года назад +2

    Carbon is resistive dependent upon how densely it is packed. That the carbon pile battery testers. The original microphones were cups filled with carbon powder in which the diaphragm compressed changing the resistance.
    An easy demo is to take a pencil (softer lead is better) rub a swath on the paper then check the resistance at various places along the length. Add more pencil lead and get less resistance.

  • @cruzrobledo6631
    @cruzrobledo6631 4 года назад +1

    I Have never seen that before and i have been doing Hvac for over 20 years! Thank you for sharing!

  • @jply87
    @jply87 4 года назад +1

    A friend of mine had a brand new contactor that would not conduct electricity through the floating bar. He measured on the bar itself and not the screws. It showed 208 (commercial job). A solid metal bar that would not conduct!!

  • @richardsmiley1515
    @richardsmiley1515 4 года назад +1

    I had one of those once, same problem tripping breaker. I never tried to figure out why, but now I know. Good video!

  • @chargedmtb7440
    @chargedmtb7440 4 года назад +7

    Given the condition of that contactor I would have recommended replacing it to begin with.

  • @OcRefrig
    @OcRefrig 4 года назад +11

    Interesting. Good find ! Contactor kinda looked like crap. I would of replaced just from the looks of it. Contactors are cheap. Im lucky to get 5 years out of a Contactor these days. The quality is terrible these days. Worst ive ever seen in my 39 years in this trade. Im finding weird contactor failures too. Springs failing at 3-4 years.

  • @RJMaker
    @RJMaker 4 года назад +2

    Thank you for the video. I would say a VERY rare find in an A/C component. See these kinds of "carbon" trace shorts in DC voltage components.

  • @UlisesPalacios
    @UlisesPalacios 4 года назад +2

    Crazy. I’ve had that happen with a semi hermetic compressor on the terminal block. I could read resistance with my meter from the leads to the insulator block.

  • @ninamcclure2193
    @ninamcclure2193 3 года назад

    Carbon tracing is common in vehicle distributor cap where there is high voltage. Great video

  • @philllsxga.7737
    @philllsxga.7737 4 года назад +1

    Great video!
    I've seen carbon tracing on spark plugs before that caused a miss fire..

  • @hozerhvac4406
    @hozerhvac4406 4 года назад +1

    Thanks for sharing. Interesting find

  • @Alfonsodag
    @Alfonsodag 4 года назад

    Bakelite will break down and carbonize over time when exposed to heat with high voltages. This occurs with motor contactors because when the circuit breaks, there is a voltage spike which is much higher than the rated voltage due to the induction of the motor which tries to keep the current flowing through an open circuit. Phenolic board breaks down in a similar manner. I have seen vinyl cords break down over time when exposed to mold which carbonizes the vinyl. Phenolic and vinyl can catch fire in these circumstances. Bakelite usually just smokes and glows as the carbon completes the circuit. Thanks for the good testing and analysis of this failure. Good video!

  • @googacct
    @googacct 4 года назад +2

    You might want to get a microscopes. It could be cheap usb type or a go a little fancier and get regular 40x inspection microscope. Then you could look at soemthing like that zoomed in and get a better idea of what is happening. It might also help when trying show small features in videos.

  • @jagmechtech
    @jagmechtech 4 года назад +1

    I have seen that issue before in field. I would of replaced the contractor by just the way it looked. No need to pull meter out when it looks like that. That would have saved a call back.

  • @BYENZER
    @BYENZER 4 года назад +1

    So, a true full PM (Preventive Maintenance), checklist may include:
    1. OPEN service power disconnect.
    2. Remove any load side 240V wires AND 24V wires from the contactor.
    3. Apply MEGGER/MEGohmeter tester between contactor poles.
    Good reading = restore wires to respective terminals
    Bad reading = replace contactor

  • @jasonwright8529
    @jasonwright8529 4 года назад +1

    your videos are very helpful. I'm 3 years in, working in the HVACR field. No schooling just hands on this far. Please can you make a video of a time delay relay on break and make?
    Also, i installed a time delay relay today to bypass a low pressure control for this walk-in freezer that we just installed. When i pumped down the system, to check cut in and cut out there was no delay.... idk hard to explain please help!

  • @heavydiesel
    @heavydiesel 4 года назад +1

    Damp or bugs etc could start it tracking between the two poles, its then burn up the plastic and keep tracking. Think distributor cap in you old style cars.

  • @mforrest85
    @mforrest85 4 года назад +23

    Carbon is conducive. They use carbon brushes in motors.

    • @eriknunez8757
      @eriknunez8757 4 года назад +1

      Would that be like a grounding brush on a VFD driven motor?

    • @sherrymaeortega9749
      @sherrymaeortega9749 4 года назад +1

      yes you are true

    • @sherrymaeortega9749
      @sherrymaeortega9749 4 года назад +1

      carbon is build, when the contacts of two conductor heats,, specially when it is loose contacts

  • @InsideOfMyOwnMind
    @InsideOfMyOwnMind 4 года назад +3

    Carbon tracking can start with a dirt path and build from there.

  • @publicmail2
    @publicmail2 4 года назад +3

    Exactly how linemen find shorts with a thumper which induces hv into an underground line and find arcs and repair short which is only going to be at high voltages.

  • @kmagnussen1052
    @kmagnussen1052 4 года назад +2

    The only place the carbon can come from is the plastic insulators. The contacts by there very purpose have to be made of metal. The actual metal can be different based on the current and voltage for the designed application. The metal at the contacts under high current and voltage arc thereby vaporizing a small amount of metal each time. If enough is deposited a short may develop during high current high voltage use and this would start as intermittent but eventually fail as a dead short. If I see pitted contacts on any relay I replace them.

  • @dondesnoo1771
    @dondesnoo1771 4 года назад +2

    Had that with electric stove where wires come in to a terminal strip to ground hole in Bakelite to ground.🤗int breaker trip started on fire eventually.

  • @BarefootBill
    @BarefootBill 4 года назад

    I run into this condition all the time in my side business of vintage tube amp repair. A carbon track becomes part of the molecular structure of the insulating material and cannot be removed. Happens often in power tube sockets when the tube has an internal short occur.

  • @royamberg9177
    @royamberg9177 4 года назад +3

    It got wet. You can see that. Then it started arcing and made a carbon track

  • @paulgaras2606
    @paulgaras2606 4 года назад +1

    When I started out about 5 years ago, i found a unit with the same issue.
    The old guys I worked with claimed it was the all the lead that “chinamen” our in their plastic.

    • @paulgaras2606
      @paulgaras2606 4 года назад +1

      Not sure if there was anything to that of if the guys who trained me were just a bunch of racists. Or both.

  • @jamesd2735
    @jamesd2735 4 года назад +1

    I seen it this year but have never seen it before then.

  • @taylerellis378
    @taylerellis378 4 года назад

    It's called polarizing when the insulator becomes conductive. I am a commercial tech and I have run into this many times. The plastic on the contactor becomes conductive and will create a ground fault or short. I see this mainly on older trane roof top units where there is a plastic terminal strip in the blower compartment for the blower motor connections. The terminal strip will polorize over a long period of time and ground out the blower power causing the breaker to trip. I fixed this issue on many of the same style similarly aged units by removing the power from the terminal strip and using wire nuts to make the connections. Problem solved however, knowone would ever believe me even though the problem was solved. The things we learn every day on this trade.

    • @flybyairplane3528
      @flybyairplane3528 4 года назад +1

      Tayler Ellis yes been there done that always TRANE ! 230 v , or 480 v same darn thing , cheers 🇺🇸🇺🇸🇺🇸🇺🇸

  • @palamidi13
    @palamidi13 4 года назад +1

    Thanks for sharing Great Information!!

  • @kangaroogod
    @kangaroogod 4 года назад +2

    Very interesting. Perhaps the carbon, plastic and heat created in essence a conductive carbon fiber?

  • @publicmail2
    @publicmail2 4 года назад +2

    E\R=I would be 0.00000436amps so clearly ok unless it arcs and breaks down with higher voltage as happened. Carbon is a conductor when arcing occurs resistance goes toward 0.

  • @joelperigo7213
    @joelperigo7213 4 года назад

    That blue residue on the contactor looks suspect to me. I had this issue about a month ago blowing the low voltage fuse on the furnace and what I had found was that some of the cleaner I used a month before got into the control compartment and dripped down onto the contactor which eventually caused a path for the low voltage current to go to ground.

  • @johncote2776
    @johncote2776 4 года назад

    wonder if there were surge voltages or if the 5 minute compressor delay wasn't functioning well

  • @Q_thulu
    @Q_thulu 4 года назад +1

    peak of 240 is 240......2 legs of 120 volts 180 degrees out

  • @gnaneshsiva9193
    @gnaneshsiva9193 4 года назад +1

    Yes that's true
    Thanks

  • @ATeamAdam
    @ATeamAdam 4 года назад +1

    Great video

  • @Oscarbm1234
    @Oscarbm1234 4 года назад +3

    Had countless of these contactors do the same. Could never find an explanation even after i took them apart...

    • @obviouslytwo4u
      @obviouslytwo4u 4 года назад

      www.amazon.co.uk/Doc-Johnson-Boy-Anal-Wand/dp/B00158DDYG?ref_=mh_s9_apbd_orecs_b30fnyB&pf_rd_r=8XJ69MVR0B5FR4VBF60B&pf_rd_p=55cdf61f-9be8-5eac-bfe4-e1638e490c3e&pf_rd_s=mobile-hybrid-11&pf_rd_t=BROWSE_ANYWHERE&pf_rd_i=2758362031

  • @ZhangyXD
    @ZhangyXD 2 года назад

    There are solid state contactors rated thousands of amps now

  • @dariusloyd7415
    @dariusloyd7415 4 года назад +1

    Good video

  • @dougshakell8003
    @dougshakell8003 4 года назад +1

    Common on 600vac contactor see it all the time.

  • @hightide9513
    @hightide9513 4 года назад

    If a contractor looks like that just imagine how bad the contacts are. I would have changed it regardless, especially if I’m trying to single out a direct short. Should have been changed on the first service call.

    • @HVACS
      @HVACS  4 года назад +1

      The contacts weren't that bad

  • @IamAnoop10
    @IamAnoop10 4 года назад +1

    Is that compressor getting over heated in seconds after turning on and trips?

  • @joehead1294
    @joehead1294 4 года назад

    Fluke 1587 somebody got deep pockets! Did you test to ground as well? Did not see that in video. Might have taken less potential for short to ground. Most tech if have a megger will use something like a Supco M500 that can't kick it that high.

  • @davenone7312
    @davenone7312 4 года назад +1

    Just replace the contactor! Its cheap and easy! Get em on EBay dirt cheap! I can have it swapped out in 10 min while you spend hours with fancy meters and troubleshooting time! Maybe even replacing a dang compressor. And who pays for that when it does not fix the problem??

  • @Barracuda48082
    @Barracuda48082 4 года назад +1

    The coloring agent...
    old style bakelite material never did this..only carbon colored thermal plastics. Do a conductive isolation test on a tan colored plastic, compare to the black version. I think it (carbon) adds strength to the materials for torqueing binding screws.
    ask a senior auto mechanic about carbon tracing in the distributor caps....25,000 volts dc arc at each plug tower splattering byproduct or carbon into the area which the rotor whirling in a circle carries these particles in the same direction a million times. Eventually leaving a trail between the towers and causing a 'short' or alternative conductive path for the high voltage to use. This might be one reason of the solid state ignition and sequential timing..no moving electrode. Since this application has no whirling, I would bet it is the break down of the plastic.
    As my dad once joked about the foundry work..,"if you wanted a day off, pour your black coffee into the molten metal during forming and cooling'", the coffee at 2500 degrees turns to a carbon fissure and pretty much a hole in the plate of steel.
    Another thought created by Bryon again 👍🏼🤔

  • @knockitofff
    @knockitofff 4 года назад +1

    3:08 WRONG, the contacts arc when they break, you're breaking an electromagnetic field. Contact damage is done when they de-energize.

  • @Guyhakverdi
    @Guyhakverdi 4 года назад +1

    DO YOU REPLACE CONTACTORS WHEN YOU DO PM MEASURING OHM READINGS?

  • @mpugliano
    @mpugliano 4 года назад +1

    I use the Zebra Model ZS-2 I have had very good luck tracing shorts in a matter of minutes. Maybe you can do a video on it. I think it is a very under utilized tool. I understand that you were explaining an unusual fault that the contactor was creating.

  • @pastormartinez4676
    @pastormartinez4676 4 года назад +1

    I had a similar problem with a 3/4” conduit pipe sticking out of the roof (in a condo complex) under the disconnect somehow rain water got in and filled it even dough it had “watertight fittings”.Inside the attic space it had a romex connector at the end of the pipe with a bunch of electric tape around it. I tried everything,omh’d the compressor,the fan motor,inspected and tested contactor,capacitor,wiring and it kept tripping out the breaker but intermittently,it was until I removed the tape that I noticed some dripping and then pulled the wires,it was then when it became evident that water was conducting to ground! Even when I did all testing on the wires it showed everything was good! Bottom line...if You suspect something is wrong,keep going till you find it!🥵😳🤯🤬

  • @Zorinlndustries
    @Zorinlndustries 4 года назад +1

    Chips from hole saw?

  • @dwarden3
    @dwarden3 4 года назад +1

    From Geco piss if your wondering.

  • @SCHWIZ_GTA
    @SCHWIZ_GTA Год назад

    What causes the contactor to start buzzing loudly have a unit where it happened again a year after replacement.

  • @2slick86
    @2slick86 4 года назад

    I had one do this

  • @aliso-pv7ll
    @aliso-pv7ll 4 года назад +1

    "It's Alive!" "It's Alive!"

  • @charlylan
    @charlylan 4 года назад +2

    I think that contactor is not rated at 1000V, in addition to being old, dirty, wet and rusty due to environmental conditions (AC application). In the same way, the video is interesting ...

    • @Es0ter1ca
      @Es0ter1ca 4 года назад +1

      High voltage or not, the current that is being put through it is extremely small, and it’s only for a few seconds. The thousand volts was just a demonstration of forcing the problem to show itself.

  • @samtc26
    @samtc26 4 года назад +1

    I bet the plastic is cracked in between the terminals.....

  • @technician9722
    @technician9722 4 года назад +1

    Thanks for sharing!! Where can I get a hat?, I’m the one that asked about the red HVAC hat on some of the other videos

  • @BYENZER
    @BYENZER 4 года назад +1

    It's CARBON TRACKS, not carbon traces. ARCING, lays down CARBON TRACKS. In automotive, spark plugs will SHORT to GROUND, via carbon TRACKS, clearly visible, up and down the white porcelain insulator part of the plug,. Tracks are made by HIGH VOLTAGE ARCS between plug wire connector and spark plug's metal base/body. Tracks then provide easier path, for each successive arc to follow. Problem worsens, with each arc.

  • @josemagallanes7779
    @josemagallanes7779 4 года назад

    Interesting.

  • @cryptofox9788
    @cryptofox9788 4 года назад +1

    Coastal salty air environment?

  • @cdubs1723
    @cdubs1723 4 года назад +3

    It’s a $8 part. Replace it and move on.

    • @cdubs1723
      @cdubs1723 4 года назад +1

      Pro Answers packard is made in China and those are $8. What brand do you recommend and what makes them worth the extra $10-30?

    • @benfbuilder
      @benfbuilder 4 года назад +1

      @@proanswers 2 pole mars brand contactor is $8.51 from my local supply house. The most expensive one they sell is $23 for a 3 pole contactor. Sounds like you're getting hosed.

  • @alessichris07
    @alessichris07 4 года назад +1

    👍👍👍

  • @Hvacstuff89
    @Hvacstuff89 4 года назад

    Wow!!!

  • @hvacresidentialbasics7684
    @hvacresidentialbasics7684 4 года назад +1

    Neet Oh😳

  • @samhulsey5766
    @samhulsey5766 4 года назад +1

    unreal

  • @ickyz0
    @ickyz0 4 года назад +1

    can you replace a single pole contactor with a a 2 pole contactor?

    • @seang.2046
      @seang.2046 4 года назад +1

      Yes you can.

    • @michaelmonaghan2717
      @michaelmonaghan2717 4 года назад +1

      Yes!

    • @mforrest85
      @mforrest85 4 года назад +2

      As long as you don't have a compressor heater its fine.

    • @Pop_A_Chaderall
      @Pop_A_Chaderall 4 года назад +1

      @@mforrest85 www.google.com/amp/s/www.hvacrschool.com/crankcase-heaters-and-single-pole-contactors/amp/

    • @speckulator7516
      @speckulator7516 4 года назад

      Not If the unit has a crankcase heater! You need to stay with a single pole or the crankcase heater will not work on the off cycle.

  • @jerrylockhart3069
    @jerrylockhart3069 2 года назад

    Cuul

  • @jewdali1
    @jewdali1 4 года назад +1

    this us contactors are crap , european contactors are better designed and more reliable . In General French and German electrical components are the best .

  • @michaelmonaghan2717
    @michaelmonaghan2717 4 года назад +1

    What the hell are you talking about? Unless you had a jumper on the other end! You better not have any continuity between those two legs you tested!

    • @MrRay3801
      @MrRay3801 4 года назад +1

      He is talking about the carbon "soot" you find all over older contactors. Apparently that soot can be conductive and cause shorts

    • @joeshearer1247
      @joeshearer1247 4 года назад +2

      @HVAC School Hello captain obvious

    • @HVACS
      @HVACS  4 года назад +3

      I’m sorry I’ve failed everyone apparently 😉

    • @michaelmonaghan2717
      @michaelmonaghan2717 4 года назад +1

      If that's the case, my apologies for being the class dunce, but I heard nothing about soot or continuity between two seperate legs! If I missed that, point it out and I will stand corrected.

    • @michaelmonaghan2717
      @michaelmonaghan2717 4 года назад +1

      I am very familiar with "carbon tracking!" I just didnt hear it, I missed it somehow. I like the videos, thank you, no offense intended.