HVAC Training Board: How To Troubleshoot A Contactor (Electrical Training Board/2 Pole Contactors)
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- čas přidán 30. 06. 2024
- HVACR(Heating, Ventilation, Air Conditioning/Refrigeration) Training Board: How To Troubleshoot A Contactor (Electrical Training Board/2 Pole Contactors) How To Check A HVAC Contactor With A Multimeter
A contactor is an electrical device which is used for switching an electrical circuit on or off. It is considered to be a special type of relay. However, the basic difference between the relay and contactor is that the contactor is used in applications with higher current carrying capacity, whereas the relay is used for lower current applications. Contactors can be field mounted easily and are compact in size. Generally, these electrical devices feature multiple contacts. These contacts are in most cases normally open and provide operating power to the load when the contactor coil is energized. Contactors are most commonly used for controlling electric motors.
There are various types of contactors, and each type has its own set of features, capabilities, and applications. Contactors can break current over a wide range of currents, from a few amperes to thousands of amperes, and voltages from 24 VDC to thousands of volts. In addition, these electrical devices come in varying sizes, from hand-held dimensions to sizes measuring a meter or yard on one side (approximately).
The most common application area of the contactor is high-current load. Contactors are known for their capability to handle currents of over 5000 amperes and high power over 100 kW. Heavy motor currents produce arcs when being interrupted. These arcs can be reduced and controlled using a contactor.
The following three are crucial components of the contactor:
Coil or Electromagnet: This is the most crucial component of a contactor. The driving force that is required to close the contacts is provided by the coil or electromagnet of the contactor. The coil or electromagnet and contacts are protected by an enclosure.
Enclosure: Just like the enclosures used in any other application, contactors also feature an enclosure, which provides insulation and protection from personnel touching the contacts. The protective enclosure is made from different materials, such as polycarbonate, polyester, Nylon 6, Bakelite, thermosetting plastics, and others. Generally, the open-frame contactor features an additional enclosure, which protects the device from bad weather, hazards of explosion, dust, and oil.
Contacts: This is yet another important component of this electrical device. The current carrying task of the contactor is done by the contacts. There are different types of contacts in a contactor namely, contact springs, auxiliary contacts, and power contacts. Each type of contact has an individual role to play.
How the Contactor Operates:
Operating Principle of a Contactor: The current passing through the contactor excites the electromagnet. The excited electromagnet produces a magnetic field, causing the contactor core to move the armature. A normally closed (NC) contact completes the circuit between the fixed contacts and the moving contacts. This permits the current to pass through these contacts to the load. When current is removed, the coil is de-energized and opens the circuit. The contacts of the contactors are known for their rapid open and close action.
The contactor in your air conditioner is a small electrical
relay that starts or stops your compressor after a small signal is
received from your thermostat; much like the ignition circuit of
your car. Over its life your contactor can be asked to start and
stop your air conditioning system thousands of times. After
thousands of on and off cycles your faulty contactor can cause
major problems. Your contactor can fail in one of two ways,
electrically or mechanically.
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Thanks for watching!
Email: JumperManTech@Gmail.com
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I pray to become as badass as you are!! 4 years in the game. Still struggle with a lot but if I study an hour a day and continue to keep my mind sharp by learning from techs like you, this year will definitely be a great year🙏🏾
❤
Awesome training board for the new hvac technician!
As an electrician of 36 yrs, I love your videos because I generally don’t get to work on HVAC systems very often so it’s very interesting! I was just on a rooftop troubleshooting a 480 volt over load relay for an AHU that hadn’t worked in 7 yrs! All it was, was a bad over load relay, $300 part, all fixed. It makes me feel good to solve problems. What did confuse me was that the relay had an auxiliary contact on it and I couldn’t figure out what it was energizing because it got lost in a bundle of cables but in the end it didn’t matter anyway. Thank you!
I’m not an HVAC tech, but this is exactly how my exhaust fan banks are wired at my commercial greenhouses that we’ve been working on. I never realized it all worked the same. I’m going to start teaching my son, I’m going to show him these videos.
Excellent teaching tool. I am an HVAC contractor and teaching my young son the business. Great teaching tool you made. Thanks, JMT!
Great video, bro!
You can also test the amp draw, as well as each coil's resistance values as well. Regarding the Primary side, you'll notice that if you place one of your multimeter's leads on Common and the other lead on one of the three line voltage wires, you should get the same resistance, no matter what line voltage wire that you choose in relation to Common.
However, if you begin testing the resistance between any two Line voltage wires themselves, you'll notice a pattern: The resistance found between the two furthest Line voltage wires is the sum of the resistance found between two pairs of two adjacent Line voltage wires. That is, the resistance between the 120V Black wire and 240V orange wire is the SUM of the resistance found between the 120V black & 208V red wire, plus the resistance between the 208V red wire and 240V orange wire.
This sum check is confirmation that the Primary coil has the proper resistance in its coil.
Regarding the Secondary side, there should be almost no resistance in its coil - approx 0.6 Ohms-ish. There should be continuity.
Hope I could help.
Best explainer video on AC wiring. This brother needs more views!
Thank you! I appreciate the feedback 🙏 Let's run up those views! Like & share ✌✌✌ Stay tuned for new videos every week🔧
thanks for taking the time to make this video. very deep detail knowledge that's usually skipped over in anything else i've seen on you tube ... bravo man !
Excellent demonstration and interesting subject. As always great job JMT. 👏
Thank you very much Bogdana! ⚡⚡⚡
Excellent video. Thanks for taking the time to set this up and showing it.
Takes a lot of work to do all this , thank you for your time
Definitely does but I had a great time doing it. Thank you for your response and for watching. Stay tuned for new videos every week🔧⚡️
Thank you for Great demonstration all in detail. Amazing job it is appreciated JMT.
Good job bro it gave me even a better understanding of the in and out flow of 120/240/24 volts operation 💪🏾💯💯
What a great teaching video. Thank You!
Hell yeah, great video. You explained it very well 👏🏾 appreciate it.
What an excellent demonstration. Well done bud
i seen this type set up on another video and i loved the idea of doing this i watched you video and learned a lot ty i only wish i could build my own to help learn this i am a hvac student now and wish our school would let us make these.
You are my hero buddy omg the best instructor I ever had
Keep up the good work!
What a great explanation! Thank you bro
Nice video Jumper man, you're a great teacher.
love this!! thank you for sharing 🌟
Thank you! ⚡⚡⚡
Man, this is the best video I've ever seen!!!
Thank you for the Video.
Do share the Circuit diagram with the video it help to do personal wiring for self practice
You're welcome and thank you! This is something I just made in my head. I will try to draw a diagram but I will definitely make a video explaining the wiring. Thanks for watching & for all your support! Stay tuned for new videos every week⚡⚡⚡
Keep doing it even us who is in the field need reminders as well
Very nice set up and explanation of the cycle.
The best explanation on CZcams
Great video, very technically informative, Thanks
your board is all most identical to the one i made years ago
I wish I could still do this however health issues forced early retirement
Thats what we need carry on at like this traning vedios thank you
Thank you! Glad you enjoyed it. Stay tuned for new vids every week! ⚡⚡⚡
Wow,. Great video, please keep it up. Learning a lot. 👍
Thank you Joaquin! Appreciate the comment & I'm glad you're learning alot. Stay tuned for new videos every week🔧
Thanks for the efforts to showing this information appreciate you 💐
You're very welcome & thank you! Appreciate your support. Stay tuned for new videos every week🔧⚡️
Great video, thank you so much!
💪👍🇺🇸 great informative video. Thanks JMT
Thank you Shine! 🇺🇲⚡
Perfectly understandable
Love it, thank you 🙏 very easy to understand
Would you happen to have a video explaining the training board? We have yet to have electricity at work, and it would be nice to build one for pre-knowledge and fun. Thank you.
Amazing information!!
Thanks again, great explanation. I just joined your channel and gave a like 👍
Great job!!
I learnt a lot from you. Thank you so much
hello from iraq with you well done
Thank you very kuch Za! ⚡⚡⚡
@@JumpermanTech where do you buy all of the components so I can make a lab please let me know
Excellent!
I wanted to thank You Jumper Man .
Thank you for that & thank you for watching. Stay tuned for new videos every week🔧⚡️
Well simplified thanks
Excellent video
Excellent presentation.....
Great video, I always jump when my condenser kicks on too😅
Jmt great training board 👏 👌
Thank you Neilvester! Always appreciate your support 🙏⚡
Like it a lot !
Very very clear specific the way what controls the cooling system. I went out school and be honest I get out very confused about the way my teacher tech me . I like your videos better sir .
I will like more videos on comercial traulsen fridge and continental fridge why evaporator buildup ice in the evaporator and wich coul be the solution thanks jumper man!
Nice explanation.
Thank you Gary! 🙏⚡
Thanks so much sir for information about this
Nice job!!!
Thank you! Stay tuned for new videos every week🔧⚡️
Thank you!!!!!
Awesome video
Incredible I fo and learning
Thanks so much
God speed
where were you when I wasted my gi bill on rsi... lol good job man keep up the free lessons!
Great video🙂
Great video… 1 suggestion… show them once the thermostat is calling that the 24 volts should be on your yellow wire and common, that way you know the thermostat is calling…
Thank you very much.
You're very welcome & thanks for watching! Stay tuned for new videos every week🔧⚡️
Nice 👍 thank you so much ❤
Very informative
great job
good to know that contactor has a definite purpose!
Great demonstration. Did you have to make a suicide cord to power the board were it connects to the receptacle?
Jumper man tech
Would you mind please do a video about a pump down when you have a low and high pressure switch . Thx
Excellent
good job
this vedio is great but iam not hvac technician please i need step by step how an a/c with time delay and contactor woks
I like the video
If you read ohms across the contactor, what is a normal reading you usually see? I have seen people say you read 0 ohms, but also seen people say you want to read between 10-20 ohms?
Thank you.
well done
Thank you Za! Appreciate the feedback 🙏 Stay tuned for videos every week!🔧⚡
Nice class could timer switch also be.called relay?
Would you make a video on how to build one of these nad ass trainers with all of the parts. Many of us would love to build one.
Can you do us one on step-down transformer connection please. Thanks
What color wires are running through the red conduit to the light? I see the green which I assume is the ground. looks like two wires to the fan, shouldn't there be a white to the light too?
Nice
Thank you for your video. There are no numbers labeled at the poles, are those top and bottom poles identical? If so, you can run "power in" at the top or bottom poles, right?
You're very welcome! Thanks for watching & commenting. You can install it either way so yes, you're good 👌 Stay tuned for new videos every week🔧⚡️
I did not know that about a coil that's energized that you actually get a voltage reading.
Is it normal to have a time delay for the AC condenser and compressor?
I would like if you trace the wiring and explain how they operate
Is the Tstat going thru either common or yellow?
What units use this type timer? Used in heat pumps, gas, or both?
What do they call timer?
What if my contact doesn't have the plunger piece that i see on multiple videos. I've replaced the capacitor and a burn wire going to the compressor and everything looks right but nothing turns on when i turn A/C on. I can hear power going to the unit but that's it. I checked the AC breaker as well.
Start capacitor’s role is? Would it be where the timer is (yellow to the Contactor)? My Contactor isn’t closing so it’s a low voltage issue. Correct? --->(Capacitor)?
hey a quick question regarding voltage, at around 5.04 you measured red to blue and the other wires, the meter reads 24 because R is energized and the other wires aren't so the difference in potential (voltage) is 24 at that point. and when you set it to cooling because Y is energized the meter reads 0 because now theres no potential difference between R and Y right? still trying to wrap my head around voltage readings being a difference in points. thanks for the video!
This might help as to fundamentals of what voltages are read where---> czcams.com/video/F05kWMTOmrM/video.html
Need wiring diagram showing where each wire goes from the load side of contactor. Is timer always in series with yellow 24V? Is blue/common required if batteries are not used in thermostat? What wires go to and from transformer? Thanks!
@ManoNfire Common is always needed to complete the 24V circuit in a thermostat with or without batteries.
This is something I just created in my mind. No wiring diagram but I will try to draw one. I will create a video explaining the wiring and what I did here. If the timer is for the compressor or condensing unit then yes, it will be in series with the "Y" wire from the thermostat which is typically a yellow color by code which represents "Cooling". You will not see a C/Common wire on every thermostat so if it's not used, you will notice it's a battery operated thermostat. I will make a video explaining your questions. The 24v from the transformer is connected to R on the stat then eventually each 24 circuit makes its way back to C on the transformer to complete the circuit. Thanks for watching!
@@odeliocepeda6054 not true. Common is not needed in battery or mercury thermostat. In fact most homes don't even have a common wire available to use.
Well if ur fan is off u couldn’t have 28vac on the y, one u set it to cool the thermostat will energize y and kick on the cooling
Is it possible to buy a training board already assembled thanks dilks
When u say 3 phase ur referring to the contactor lmk I really wanna make sure I understand these terms/ symbols confuse me also good video
Nope that’s def not it I’ll keep at it
Do you have a video creating this and explaining it? I did it in school but didn’t understand it much
I don't have one creating it but I will make a video on the details of it and explain the wiring. Good idea. Thanks for watching! ⚡⚡⚡
@@JumpermanTech that would be Awesome thanks man !!
@@santiagocordova6665 Got you! It's a good video idea too. 🙃✌
I think my coil didnt energize but i pressed the contactor and i energized and stayed on now does that mean my contqctor is bad
Should I have 28 v on both wires coming from the Thermostat going to both sides of the coil. I check both wires they both have 28v independently.
Im not sure why I have 28v on my both wires going to the coil. It does not pull the coil in.
Kinda felt lost when you was mentioning in the video:
When the thermostat calls for cooling 24v (R) converts to 0v (Y) making the timer drop from 24v to 0v to make the contactor turn on ?
I honestly thought that when the thermostat kicked on cooling it transfer 24v (R) to 24v (Y) making the timer work, the timer doing its job by transfering 24v to the contactor to kick it on by giving the contactor 24v to pull the 108/230v to make the compr3ssor run
Likewise
He said voltage drop to 0
So what if im not getting 24v at thermostat and terminal block
Where is the 24 volts coming from? because the thermostat only has double AA Battery .
Hvac hp lp pressure switches and oil pressure pressure switch connection plz
owe some explanation Bro! can you send us your diagram thanks a lot.
what happened to the other components??
i need the details wiring diagram
I can make it like this training board
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I am Muhammad Naeem
Electric heat relays video 9n this 240 v with thermostat thermo Stat 3 honey well