I've been doing HVAC and electrical work since 1992. This was the best instruction I've ever seen for the start circuit on a single phase compressor. Great job sir.
@@21footxpress wow bro. youutbe showed me one of your vids from 14 years ago. like what? that is old. But it chose yours. looked at your stuff and you havent uploaded in 13 years? But you did respond to this msg from 1 year ago. bro, you gotta come back.
You have made one of the best, simplified videos I’ve seen on RUclips. Most people just make things to difficult. You took something that is confusing to many and made it very easy to understand. Great job!
This is a shame! I have been in hvac school for 2 semesters and my instructor has never broken this down this easy! I have been searching for hours tonight to understand this and u did it in under 10 minutes! Keep it up man
This guy always seems to be spot on. I refer people to his videos a lot. Keep in mind your classes are no different than any other higher education class. It's there to expose you and make you familiar with what you don't know. It's then up to you to look for places like this to learn about it from different angles. How far you go is always up to you.
Power giveing 220v coil engzing coil power com and strpoited r ..runing poing strting windinv power engzing l1l2 comon netsl power starting poing ruing and coomn disconting working
I have ben studying this motor starting stuff for a while with no good understanding of the electrical principals of how the relay cut out worked and this guy explains it so well there is not a shadow of any doubt of how it works. Thank you and God bless. Gil
Great video. Most techs have no understanding of electronics. The voltage produced on terminal 2 is from the collapsing of the magnetic field on the start winding which is higher than the supply voltage. It is important to point out that although almost everyone will insist that capacitors pass AC current, that is not true. They simply appear to pass current due to the rapid charging and discharging. Understanding this fact will help techs understand why a larger capacitor results in a larger current across the device.
I came here because I decided to install a hard start kit on my home AC condensing unit, just for familiarization. The instructions are quite clear, but I'm the curious type... I teach at an electrical tech school and have a HVAC background as well. I must say, that was one fine explanation of how the start capacitor is dropped out of a circuit using a relay versus the typical centrifugal switches used in open motors. I usually don't address this subject in the electrical only class but I'm going to start now just for comparison purposes. Thanks much, good work!
excellent work here ,,,i found this guy years ago now i am aranging my favorites hvac vids and i am glad you are still here with this vid ,,,,this man knows his stuff no doubt about it ,,,,thanks again ,,,,i am here to refresh i am retired ,,,
This video is excellent, and the way he drew it out is much easier to remember than the ways I was taught. A rhyme that helped me remember how to wire potential relays was, "5,2,1...cock, sucker, run". 5="cock"(common), 2="sucker"(start), 1="run"(run). It's crude, but it's memorable. I always find myself muttering it under my breath when I'm wiring these in
book professors i love them they know their books i tell you, i have wondered if they just as good on the field. this guy knows his shit. 17 years in the hvac field and i don't really get alone with book smart guys. and i went to school for this hvac thing in the early 90s. my field experience always gave me an edge over these book smart guys.
really appreciate the video man its great to see a brotha break ish down. I am a black man and i feel that we learn better from each other there's just something about the black voice that makes you more attentive.
Good video .straight to the point . You are a true teacher .thanks for posting it. So to test a relay (de energized) all contacts would show continuity for a "good" relay. Opposite a "bad" relay would be open on one terminal for a continuity test. I hope I answered my own question.
Excellent explanation my friend. It is also amazing just how much voltage the back EMF can generate. Hard for some to grasp that even though the motor is 240 volts the back emf generated can be very high even as much as 500 volts. That is why the pick up voltage is stamped on the Potential relay. Never buy a relay with less pick up voltage than is stamped on the relay.
Beautifully explained....... I was browsing you tube and found your vid, could have done with this when I was an apprentice, I remember an engineer going through motors with me 25 years ago .... shame you tube wasn't invented then, as he wasn't the best at explaining/conveying information.... :) :)
Hi from OZ andd thanks for youre clear and easy to understand demos.I have heard you mention another motor demo.Is it on youtube ?, as I cannot find it.Keep up the fantastic work !!
i enjoyed watching this. its like being in school without being at school lol i thought it was the power comming from your line 1 that energizes the coil on a pmr that opens the contacts. but emf makes sense a bit. god bless!
you r video is very easy to understand because you explain good i just would like to ask something the numbers on the potential relay still the same on all brands or they change? thanks for the video is good
ive watched everyone of your vids, and i love how you break and it down and simplify it, keep up the good work. do you think you can do a video on how to troubleshoot a particular circuit, as far as where to put your leads and find what component is bad? thanks again.
I enjoyed the video.How did you know there was a capacitor in the coil of the relay?Also what meter do you prefer? Again i think you really have a gift for teaching Thank -You again!
i learned this in trade school 12 years ago im pretty good w troubleshooting motors can u do a electrical diagram on fan centers the most intimidating relay/transformer of all time thanx luv ur videos
Oh, boy, out of confusion comes a moment of clarity (I think). The start windings and the relay coil are in parallel, and when the motor is not spinning, the impedance of the start relay is far higher than the start windings, so almost all initial current goes through the start windings. I reasoned that as electrons flow and the motor spools up, back EMF effectively increases impedance of the start windings, reducing current draw and leading to more current following the parallel pathway through the relay coil. That extra current through the relay coil pulls the contacts open, resulting in a transient voltage spike at the S post, for a few hundred microseconds. But what keeps the start relay going after that? After all, with relay contacts open there's no pathway for electrons in the relay coil to get to the L2 side! It's now trapped in a blind loop with the start windings. I'm guessing the relay stays closed because the spinning motor acts as a generator on the start windings, producing reverse AC current with enough of a ripple through that blind loop to keep that relay coil activated. Correct?
Very good explanation. Thank you! One question, is that not a potential relay? Or is there even a difference between a potential relay and a current relay?
Great 🤔🤔Video.....just one observation (I'm no expert just interested in the subject)....but won't there be Back EMF generated in the Run Winding also?....or does this not matter....I'm a little confused 🙂. best regards Rob
@@21footxpress Yes! that'd be AWESOME if you did! You're a talented teacher! There was a teacher in NW Ohio who was legend for his teaching at PENTA County trade school (Ed Shriver), and you remind me so much of him. Hope you get time to post more.
I have a question regarding the back emf of the potential relay. I have seen the starter kits, my question is if I want to use my own start kit built by adding a start cap and potential relay, how would I size both cap and potential relay? would I measure the back emf and how do you do that and what would be my pick up voltage on the potential relay.
Hello 21footxpress Very helpful video. thanks I did not understand why during startup, current will not go through relay coil and energize. is it some thing with resistance of the coil ? shraga
Because the coil impedence is too high for the source voltage to be able to pull in the relay. The voltage needs to be higher to create enough current in the coil in order to pull in the relay.
Hi there...great video...but please tell me...I'm no electrical guru.....but in the UK we have L and Neutral. In your schematic, are you using 2 phase ie L1 and L2? If so, why would you need a start relay as presumably, there would be a difference in Phase angle! Or is L2 same as Neutral as we have in the UK for single phase supply. I'm a little confused! appreciate your feedback. thanks
Robin, he was referring to 240V single phase power. L1 is 120V and L2 is 120V. No phase shift. Many compressors here in the US run on 240V single phase power. Only small units like window units and small refrigerators run on 120V power where you only have L1 and Neutral. Hope this helps.
can u explain the route of capacitor in this circuit? bit confused to read which route it takes.. confused to understand when it been filled first, the other side been push to neutral, then the filled one return to the source which is other side of the cap and then the cycle repeat.. thanks in advance
![CHILE vs. BRASIL [1-2] | RESUMEN | ELIMINATORIAS SUDAMERICANAS | FECHA 9](http://i.ytimg.com/vi/5ObJt_71AYc/mqdefault.jpg)
I've been doing HVAC and electrical work since 1992. This was the best instruction I've ever seen for the start circuit on a single phase compressor. Great job sir.
WOW!! Thank you very much!!!
@@21footxpress wow bro. youutbe showed me one of your vids from 14 years ago. like what? that is old. But it chose yours.
looked at your stuff and you havent uploaded in 13 years?
But you did respond to this msg from 1 year ago.
bro, you gotta come back.
@@TheMookie1590 Thanks a lot. I have an idea for a new video I just need to make it happen.
Rely potaruonl rely sighl phase 5.2.1 L2 satrt cap .point 2 point and connecting startin point comprssar comon point 2winding compoint othwr point runing point comon cycliling controold over lord L1...ciecuit comepted l1 .l2 enizing compltly ..L2 ..relay contanted potentiaol re..ly connwatd no..relay coil contacting comon point L1.. contacted ...over lord ... L2 1 startcap .. 2 ponit coil wunzing starting potensional rely circiut
Rely potanshionl realy dummy point .mens mt ...46 ..mt point...))
Sir, This is an excellent explanation of how a potential relay works. i am grateful for your video.
Thank you very much
You are the man, that was the easiest to follow explanation of how a start kit works.
Excellent job.
You have made one of the best, simplified videos I’ve seen on RUclips. Most people just make things to difficult. You took something that is confusing to many and made it very easy to understand. Great job!
Thank you very much!!
This is a shame! I have been in hvac school for 2 semesters and my instructor has never broken this down this easy! I have been searching for hours tonight to understand this and u did it in under 10 minutes! Keep it up man
I'm glad to help. Good luck
Thanks
This guy always seems to be spot on. I refer people to his videos a lot. Keep in mind your classes are no different than any other higher education class. It's there to expose you and make you familiar with what you don't know. It's then up to you to look for places like this to learn about it from different angles. How far you go is always up to you.
My instructor used this video for a better explanation, thank you!
Power giveing 220v coil engzing coil power com and strpoited r ..runing poing strting windinv power engzing l1l2 comon netsl power starting poing ruing and coomn disconting working
I have ben studying this motor starting stuff for a while with no good understanding of the electrical principals of how the relay cut out worked and this guy explains it so well there is not a shadow of any doubt of how it works. Thank you and God bless. Gil
I agree with you, thank you
Very nicely done. I just ran into this circuit on a water well pump system, and I was stumped. This helped alot thank you! Subbed.
Glad that this helped!!
Very thorough and easy to understand. Good instructor. All of his videos are worth watching.
Love the way you explained this , I'm just starting to learn
Thanks. Good luck in the trade
Great video.
Most techs have no understanding of electronics.
The voltage produced on terminal 2 is from the collapsing of the magnetic field on the start winding which is higher than the supply voltage.
It is important to point out that although almost everyone will insist that capacitors pass AC current, that is not true. They simply appear to pass current due to the rapid charging and discharging. Understanding this fact will help techs understand why a larger capacitor results in a larger current across the device.
Used this video today. Watch 3 others that were not as clear as I needed. This solved my issue. That you for you clear break downs
Glad to help
been in this business 36 years, AWESOME job of teaching, well done
Thanks
Hi , I ‘ve watching you for years since I was going to HVAC school in 2009 , You are Excellent !!!
Thank you very much
Your videos are the best. The clearest explanations of any I have seen. Thanks.
Awesome training and explanation of potential relays. Please post more videos...
I came here because I decided to install a hard start kit on my home AC condensing unit, just for familiarization. The instructions are quite clear, but I'm the curious type...
I teach at an electrical tech school and have a HVAC background as well.
I must say, that was one fine explanation of how the start capacitor is dropped out of a circuit using a relay versus the typical centrifugal switches used in open motors.
I usually don't address this subject in the electrical only class but I'm going to start now just for comparison purposes.
Thanks much, good work!
Thanks for the kind words
excellent work here ,,,i found this guy years ago now i am aranging my favorites hvac vids and i am glad you are still here with this vid ,,,,this man knows his stuff no doubt about it ,,,,thanks again ,,,,i am here to refresh i am retired ,,,
21footxpress, you did a great job at xplaining potential relay. plain and simple.
Best explanation about this I have ever seen. Thank you.
Thanks
My HVAC instructor has recommended your videos. Very helpful.
This video is excellent, and the way he drew it out is much easier to remember than the ways I was taught. A rhyme that helped me remember how to wire potential relays was, "5,2,1...cock, sucker, run". 5="cock"(common), 2="sucker"(start), 1="run"(run). It's crude, but it's memorable. I always find myself muttering it under my breath when I'm wiring these in
I like the way you broke that down sir. I can wire this with ease now.
so glad I found you. never learned potential relays until now
book professors i love them they know their books i tell you, i have wondered if they just as good on the field. this guy knows his shit. 17 years in the hvac field and i don't really get alone with book smart guys. and i went to school for this hvac thing in the early 90s. my field experience always gave me an edge over these book smart guys.
Great explanation . You are very knowledgeable, and by explaining this you are doing a great service plus makes you a better person.
Yes it is.
really appreciate the video man its great to see a brotha break ish down. I am a black man and i feel that we learn better from each other there's just something about the black voice that makes you more attentive.
Good video .straight to the point . You are a true teacher .thanks for posting it.
So to test a relay (de energized) all contacts would show continuity for a "good" relay. Opposite a "bad" relay would be open on one terminal for a continuity test. I hope I answered my own question.
Just Great videos, thanks because you are taking the time to teach people, God bless you
Thanks for breaking everything down, my teacher is stupid and does not explain it as easily as you do. Thanks.
Thank You ...you did a good job and I did not even need an engineering degree to understand you.
glad to help.
You made it so very easy to understand. Thank you
Great video.. You broke it down proper. Thank you for sharing your knowledge..
Great explanation of a pot relay. Very helpful. Thanks.
Thanks for the great video. Simple and direct the way all education should be. Take care and keep posting!
You explained a CSR/PSR better than anyone or book yet.
Excellent explanation my friend. It is also amazing just how much voltage the back EMF can generate. Hard for some to grasp that even though the motor is 240 volts the back emf generated can be very high even as much as 500 volts. That is why the pick up voltage is stamped on the Potential relay. Never buy a relay with less pick up voltage than is stamped on the relay.
Thank you very much
Thanks man, you really go into detail and it has been awhile since i was in school. You make a man think. Thanks again and keep me on your list.
Beautifully explained....... I was browsing you tube and found your vid, could have done with this when I was an apprentice, I remember an engineer going through motors with me 25 years ago .... shame you tube wasn't invented then, as he wasn't the best at explaining/conveying information.... :) :)
Very Good Presentation one of the best I have seen
thanks!!!
I like the way you teach..Keep up the good work
Hi from OZ andd thanks for youre clear and easy to understand demos.I have heard you mention another motor demo.Is it on youtube ?, as I cannot find it.Keep up the fantastic work !!
I'm in school trying to figure this out for days. This really helped.. Thanks!
i enjoyed watching this. its like being in school without being at school lol i thought it was the power comming from your line 1 that energizes the coil on a pmr that opens the contacts. but emf makes sense a bit. god bless!
Amazing video, you should post some more videos man, you would help a lot of people
Thanks for sharing this..It really help me fix the broken control box by myself....
good job this is where I stared my career out if trade school I have took many collage level cores and this of the best one
you cover everthing';
you r video is very easy to understand because you explain good i just would like to ask something the numbers on the potential relay still the same on all brands or they change? thanks for the video is good
ive watched everyone of your vids, and i love how you break and it down and simplify it, keep up the good work. do you think you can do a video on how to troubleshoot a particular circuit, as far as where to put your leads and find what component is bad? thanks again.
Thanks 21footexpress,,,,,,that was great.
You have wonderful teaching methods.
Excellent, and very informative video. Thank you!
Thank you
Do you know how many years I have been trying to figure these out? I knew about the back EMF but know this makes it clear!!!!
Thank you for clearing this up for. I just wanted to make sure I understood it correctly
Excellent explanation!!!
Thank you
I use Feildpiece SC77. The newer white timers may have a capacitor in them. It was written on the side of one in very small print. Thanks!
Clear and simple, very good Job
This is a very good explanation . Thank You
A good explanation and presentation.
What a great explanation maestro thank you very much
thank you very much
I enjoyed the video.How did you know there was a capacitor in the coil of the relay?Also what meter do you prefer? Again i think you really have a gift for teaching Thank -You again!
i learned this in trade school 12 years ago im pretty good w troubleshooting motors can u do a electrical diagram on fan centers the most intimidating relay/transformer of all time thanx luv ur videos
That cleared up alot of my questions, thanks.
Hopefully you make more videos.
fantastic explanation. I hope your a teacher.
Oh, boy, out of confusion comes a moment of clarity (I think). The start windings and the relay coil are in parallel, and when the motor is not spinning, the impedance of the start relay is far higher than the start windings, so almost all initial current goes through the start windings. I reasoned that as electrons flow and the motor spools up, back EMF effectively increases impedance of the start windings, reducing current draw and leading to more current following the parallel pathway through the relay coil. That extra current through the relay coil pulls the contacts open, resulting in a transient voltage spike at the S post, for a few hundred microseconds. But what keeps the start relay going after that? After all, with relay contacts open there's no pathway for electrons in the relay coil to get to the L2 side! It's now trapped in a blind loop with the start windings. I'm guessing the relay stays closed because the spinning motor acts as a generator on the start windings, producing reverse AC current with enough of a ripple through that blind loop to keep that relay coil activated. Correct?
thank you the best explanation ever
Thanks so much! Awesome explanation!
Good review for me, I am not out in the field right now, but are there potential relays on residential AC with r 410?
@ghazanfar977. The start winding produces voltage once the motor is running. That " back voltage" is what energizes the coil.
You did a great job, keep up the good work.
great teaching ability! can you explain other components like motorized vent dampers and boiler curcuits and components?
Very Very good video! question you spoke a motor video, where can I find It?
Great videos, as always.
Very good explanation. Thank you!
One question, is that not a potential relay? Or is there even a difference between a potential relay and a current relay?
a current relay's contacts are N.O.
thank you for education! great video just want to clear something is current flow through run capacitor as well since run and start wired in parallel?
Yes. On start up both capacitors are in the circuit and electricity flows thru both
Great 🤔🤔Video.....just one observation (I'm no expert just interested in the subject)....but won't there be Back EMF generated in the Run Winding also?....or does this not matter....I'm a little confused 🙂. best regards Rob
Perfect explanation thank you very much
thanks! please keep them coming.
well explained, thank you
Another good video keep up the good work
best explanation I've heard! thanks!
Why did you stop posting? Great info about basic things in hvacr. I have 8 yrs heavy refrigeration and ac and I still review the basics. Thx
I dont know why I stopped. I really need to post new videos soon. Thanks
@@21footxpress Yes! that'd be AWESOME if you did! You're a talented teacher! There was a teacher in NW Ohio who was legend for his teaching at PENTA County trade school (Ed Shriver), and you remind me so much of him. Hope you get time to post more.
@@polemicvs Thank you for the kind words. That will motivate me to do more.
I have a question regarding the back emf of the potential relay. I have seen the starter kits, my question is if I want to use my own start kit built by adding a start cap and potential relay, how would I size both cap and potential relay? would I measure the back emf and how do you do that and what would be my pick up voltage on the potential relay.
thanks for your time that was brilliant
Hello 21footxpress
Very helpful video. thanks
I did not understand why during startup,
current will not go through relay coil and energize. is it some thing with resistance of the coil ?
shraga
Because the coil impedence is too high for the source voltage to be able to pull in the relay. The voltage needs to be higher to create enough current in the coil in order to pull in the relay.
Very nice presentation
Thank you very much
Ty well said I am going to use this to show young guys
I appreciate your videos
Thank you very much
the coil has very high resistance. Electricity takes the path of least resistance. And the coil is rated for a higher voltage than the motor
I hope you're an instructor somewhere. A 7 minute video and I now understand how this works
very well explained
excellent video.
When are you going to upload some more vidoes? They are great.
Hi there...great video...but please tell me...I'm no electrical guru.....but in the UK we have L and Neutral. In your schematic, are you using 2 phase ie L1 and L2? If so, why would you need a start relay as presumably, there would be a difference in Phase angle! Or is L2 same as Neutral as we have in the UK for single phase supply. I'm a little confused! appreciate your feedback. thanks
Robin, he was referring to 240V single phase power. L1 is 120V and L2 is 120V. No phase shift. Many compressors here in the US run on 240V single phase power. Only small units like window units and small refrigerators run on 120V power where you only have L1 and Neutral. Hope this helps.
Great video!
Do compressors without start capacitors have potential relays to de-energize the start windings once it starts?
Good job man it was nice.
Thank you.
Now that I think about it your relay has lots of potential ...
can u explain the route of capacitor in this circuit? bit confused to read which route it takes.. confused to understand when it been filled first, the other side been push to neutral, then the filled one return to the source which is other side of the cap and then the cycle repeat.. thanks in advance
good job easy to understand. thankz....
Nice job!