Thank you for breaking it down to the smallest level. It's amazing how much understanding is gleaned from the microscopic point of view. Great teaching method and detail of instruction.
dang that looks complicated ile ask a tecniction to help me with a extreme overclocking phase change cooling with a 60hp scroll compresor to handle the duty of holding subzerp temps at 5ghz or more overclocks I want too cool my gpus cpu and have my ram cooled Aswel for a overkill refrigerator pc
Thank you so much for this. I'm currently in a basic electricity class for HVAC and keep struggling with the concept of "what the hell am I looking at?" The way you break everything down on the individual wires and and how it translates to the diagram is so very helpful.
I’m an automation technician and you do really good at explaining schematics my job is very similar right away I could point out a few of the devices. The diagram is a bit more complex to what I’m used to seeing but again awesome job explaining I’m currently looking to enroll into HVAC at the tech school
I worked maintenance at a DVD manufacturing plant and you did a great job explaining the esoteric diagram in an A/C unit. I've saved this video an will be looking forward to the next one. Thanks so much.
Thank you so much Ron for this video this will help me a lot troubleshooting my very own A/C. Few days ago i observed my A/C when i turn the switch to high fan and high cool it doesn't start its just working at low fan and low cool.
Contactor coil is controlled by a control voltage of 24Vac while the high voltage feed (240 Vac) to the actual compressor motor is controlled by the contacts at the top of the schematic diagram. A good practice to protect the succinct operation of any high voltage contactor is to place a blocking diode (freewheeling diode) across (in parallel) the coil of the contactor. With 24Vac across the coil it may not be susceptible to any large voltage spikes when the current flow across the coil is removed.
If you have a 3/c #10 cable going from a 2 pole ckt breaker at the main panel to an outdoor AC unit is a line to neu. connection normally used to derive 120VAC at the outdoor unit.
Great explanation! Thank for being for so gracious in sharing this info. I never understand why so many others are snarky / hostile, etc at people who have the audacity to seek info/knowledge/training. Additionally, your video was clear and concise and perfectly lucid. You did so many things very well in your video. Great job! Great communication skills! In addition to all your other talents you are also a wonderful teacher. Thank you again for all your help!!! :-)
Good day Mr. Walker, I seem to have a problem when reading the diagrams, picturing were the terminals actually connect to? especially with relays since they can have multiple connections. Would you be doing any videos on showing the actual hook up of equipment while following the diagram? Thanks for all your great videos they have been a huge help!
When putting in a contactor make shore that you have that bus bar going back to the right legs of power other wise you will get issues. Remember that your run winding and start windings need to be powered by the bus bar side of power as well as your capacitors.
This is a good training video for the HVAC student. I teach and will show this to my class. Very good video which explains the contactor in a schematic.
Thanks Whit - would you mind setting up a time where we can discuss HVAC Training. I would like to open an HVAC school here In Florida and would be interested in your thoughts. Thanks, Ron
i am trying to replace a transformer in a straight cool air handler ,the original trans had 5 wires ,what is the proper wire combination w/ a universal transformer
question: I am replacing my portable A/C plug in, which has the normal 3 plugs ( neutral, pos and negative - however their a tiny forth wire connected to the circuit board ... should I just cut and wrap the forth tiny wire?
Do I have to use the 24 volt transformer provided in the high efficiency boiler unit to power all my old thick DC thermostat wiring, or can I provide my own separate heavy duty 24 volt transformer to provide voltage to all my DC current needs? Not wanting to blow any back fed circuits!!
Ron; Great Channel! I'm not an AC Tech, but have some electrical/mechanical background. My home unit has stopped producing cold air, and I'm being told that the compressor is bad. How can I test it, and if it needs replacing, does this mean my entire system must be recharged with fresh freon? Cant the freon in the system be recovered and reused?
Hi Ron, my name is Richard and I would like to know if you have a separate course on reading wiring diagram and schematic and if so I would like to get involved. Please let me know, thank you.
my unit wont come on...i relace the contactor...and it still dont come om.....but when i press the button inside the contactor the unit works but when i let it go it shuts down?????can you please help
I'm replacing a single pole contactor on my condenser unit...and wish to be mindful of both the contactor orientation and also the contactor connection labels. Unfortunately....there does not seem to be an industry-wide labelling consistency, on the single pole contactor originally installed ( with a shunt side....like you show here)...as to L1, L2, T1 and T2 connections. For example, as I view my vertically installed contactor, the bottom/left is L1.....the bottom/right is L2...and (of course, to match) the top left is T1 and the top/right is T2. Connections L1/T1 is bridged, or shunted.....L2/T2 has the on/off contacts. The replacement has the contacts between the L1/T1 side...and the bridge on the L2/T2 side. Also assumes "L" on top, based on the written wording orientation. So....two questions. 1.) Can I install the new unit upside down such that the L side is "down", to capture my incoming line power as before? ( I say "upside down" based on how the text is printed on the new unit). Doing this would also mimic the original in having the right side having the contacts, ...and the left-side bridged.....making a better match with the original wiring routing. 2.).....to comply with the original wiring schematic glued to the inside cover....the "new" bottom right would now show a L1 tag, whereas the original shows L2 ( etc...with all other connections labelled "wrong" also). Should I scratch off the numerical part of the T and L tags so that it doesn't look in conflict with the attached schematic?....thinking of the "next guy", especially if it isn't "me".
Maybe it runs ok or maybe the fan won't start or will run backwards. The bus bar allows voltage to be running or flowing in the direction intended for that motor and it's windings. That's why when the contactor gets pulled in power is already flowing smoothly through it's windings and no problems can occur with voltage paths. Nice smooth starts.
I have a problem with my a.c. split unit . Will not cut on . I replace both contactor and thermostat and replace wire from thermostat on inside to inside blower still nothing and I'm got power
Troy Simpson ...It’s just a “pass-through”. The contactor is a single pole switch.....it breaks and makes only one leg of the power to the device being controlled. The other leg is not switched. If both legs of the power are controlled you have a double pole switch. On the contactor , there are two connection points on the output side. This is a convenience for simplified connection to the controlled device. For example, if you were installing a new fan, the two power wires would be attached to the two output points on the contactor. One path is through the make/break side and one is through the pass-through side. It makes for cleaner wiring.
My question is I am installing a hard start kit I know the red goes to common on the capacitor and a yellow goes to harm. Does the black Wire go on the top or the bottom of the Really on the black wires. Thank you in advance.
Thanks, I have a LG outdoor unit of witch the fan and compressor are not working. There is no contactor like the one yoy subscribed. The PCB contains a few relays that probably have the same function. My question: what conditions are checked before the relays are activated (supply voltage, pressure ....??).
Han Alink I dont know if I can answer you that well as Im an electrician, but the Y connection is for cooling systems so a thermostat closes on high temp and sends voltage to the control board from there the compressor contactor should close and start up based upon the thermostat. notice that in this diagram k1 is controlled from y1 (y2 is for 2 stage or bigger units, however the fridge man describes it)
HVAC diagrams can be a bad example of good "ladder diagrams" they have so many MFG symbols , but they can be learned. Nothing like keeping a "scrapbook" of MFG diagrams,and symbols, in you truck. It's a good to point out, that wiring diagrams are shown "denergized" , with the exception of "FIRE ALARMS", that are shown energized.
I'm sad man because I'm deciding to go to school for this and I can't even get this video. Not that it's not clear , I just feel dumb man, but I never did electrical before. :( . This seems like it's elementary in electrical like the abc's right?
no offence to the guy teaching the video, im sure his good at hvac stuff, but when it comes to electrical he doesnt really explain it well. You need an electrician to teach you this stuff. This guys explanation is poor.
I was thrown to the wolves in HVAC school. Instructor tore out every single wire and said here’s the schematics wire the thing back up. Holy Crap ! It was either sink or swim, schematics didn’t look nothing like the unit I was learning to re-wire.
I am also an HVAC&R Instructor with 26 years in field and enjoy your videos but feel you may be able to polish the end product some with a script and more precise mouse or pointer movements, just my 2 cents.
The diagram there is basic schematic for the contactor. Really it's not hard but it takes practice. I'm basically a beginner. It's very important to know how the components work. And I've said a similar thing to what you said because I sat in a class where they crammed 21 credit hours of information into 1 week. It's gonna take practice man. Identify, verify, verify , and check again. This is electricity and could kill you.
question: I am replacing my portable A/C plug in, which has the normal 3 plugs ( neutral, pos and negative - however their a tiny forth wire connected to the circuit board ... should I just cut and wrap the forth tiny wire?
Thank you for breaking it down to the smallest level. It's amazing how much understanding is gleaned from the microscopic point of view.
Great teaching method and detail of instruction.
Thank you, your video helped me understand better my central A/C to fix it and not die of heat exhaustion. Thanks again from St Louis MO.
Excellent video for someone like myself who's just learning HVAC electrical wiring schematics.
Methos Millozotti Thanks
dang that looks complicated ile ask a tecniction to help me with a extreme overclocking phase change cooling with a 60hp scroll compresor to handle the duty of holding subzerp temps at 5ghz or more overclocks I want too cool my gpus cpu and have my ram cooled Aswel for a overkill refrigerator pc
jonathan oxlade I want to refrigerate my computer as well!
Thank you so much for this. I'm currently in a basic electricity class for HVAC and keep struggling with the concept of "what the hell am I looking at?"
The way you break everything down on the individual wires and and how it translates to the diagram is so very helpful.
How are you doing now 4 years later?
I’m an automation technician and you do really good at explaining schematics my job is very similar right away I could point out a few of the devices. The diagram is a bit more complex to what I’m used to seeing but again awesome job explaining I’m currently looking to enroll into HVAC at the tech school
I worked maintenance at a DVD manufacturing plant and you did a great job explaining the esoteric diagram in an A/C unit. I've saved this video an will be looking forward to the next one. Thanks so much.
Thank you so much Ron for this video this will help me a lot troubleshooting my very own A/C. Few days ago i observed my A/C when i turn the switch to high fan and high cool it doesn't start its just working at low fan and low cool.
cool video, I knew some basic electricity but this was important to understand about contactor, thank you
AWSOME!!!! great video, I was having trouble with this but this really helps me out. Thanks for posting!
You're welcome!
Awesome video! Love the two pics side by side!!!
This video was great and helped a lot. Just starting HVAC and trying to make sense of the schematics.
same here just started 3/30
Congrats and thanks you! Excellent stuff, unbelievable.
Contactor coil is controlled by a control voltage of 24Vac while the high voltage feed (240 Vac) to the actual compressor motor is controlled by the contacts at the top of the schematic diagram. A good practice to protect the succinct operation of any high voltage contactor is to place a blocking diode (freewheeling diode) across (in parallel) the coil of the contactor. With 24Vac across the coil it may not be susceptible to any large voltage spikes when the current flow across the coil is removed.
You know what man? I like you. You are good people and a great teacher. See you at work, because you motivate me to work.
Thanks for the video's. Attempting to figure out an older Bard system.
From a installer that came in the trade no school no experience. Just gave me a chance thanks I learned more then they taught me in two years😂
I wish you were the teacher at my school, thanks for the explanation
If you have a 3/c #10 cable going from a 2 pole ckt breaker at the main panel to an outdoor AC unit is a line to neu. connection normally used to derive 120VAC at the outdoor unit.
Hi, in a Utica PEG150BIDE gas boiler, where are the wires of the Safgard VXT-24 automatic feeder connected?
Great explanation! Thank for being for so gracious in sharing this info. I never understand why so many others are snarky
/ hostile, etc at people who have the audacity to seek info/knowledge/training. Additionally, your video was clear and concise and perfectly lucid. You did so many things very well in your video. Great job! Great communication skills! In addition to all your other talents you are also a wonderful teacher. Thank you again for all your help!!! :-)
Good day Mr. Walker,
I seem to have a problem when reading the diagrams, picturing were the terminals actually connect to? especially with relays since they can have multiple connections. Would you be doing any videos on showing the actual hook up of equipment while following the diagram?
Thanks for all your great videos they have been a huge help!
Great explaination
Thank you for the video saved big $ I do appreciate your time
Thank you so much, this is really helpful 👍
Excellent Video 👌
When putting in a contactor make shore that you have that bus bar going back to the right legs of power other wise you will get issues. Remember that your run winding and start windings need to be powered by the bus bar side of power as well as your capacitors.
Thanks for posting. Shouldn't the L1 and L2 have arrows pointing toward the schematic, to indicate power coming to the unit?
This is a good training video for the HVAC student. I teach and will show this to my class. Very good video which explains the contactor in a schematic.
Thanks Whit - would you mind setting up a time where we can discuss HVAC Training. I would like to open an HVAC school here In Florida and would be interested in your thoughts. Thanks, Ron
Call me anytime. Cell is 901-493-9789 and personal email is whit@whitperry.com...
Skydog n
i am trying to replace a transformer in a straight cool air handler ,the original trans had 5 wires ,what is the proper wire combination w/ a universal transformer
Ron can i connect wires from condenser to thermostat wires outside of furnace or should i go to furnace connection?
Thank sr great information about different contacts and rile
sir i want to know about low high ps cold store compresure gage
question: I am replacing my portable A/C plug in, which has the
normal 3 plugs ( neutral, pos and negative - however their a tiny
forth wire connected to the circuit board ... should I just cut and
wrap the forth tiny wire?
thank you for this video.
That was awesome! Now where do i click to download the notes on the same?
Great breakdown, thank you!
Thank you I really needed this
Good tutorial.
Great video
Excellent thank you
Thanks for your information… :)
Great video 👍🏻
For K1... which wire is "A" and which is "B"
best lecture
I still have a hell of a time reading schematics and troubleshooting..It is very frustrating..
Do I have to use the 24 volt transformer provided in the high efficiency boiler unit to power all my old thick DC thermostat wiring, or can I provide my own separate heavy duty 24 volt transformer to provide voltage to all my DC current needs?
Not wanting to blow any back fed circuits!!
Daniel Duerst. DC voltage? Do you mean 24v AC?
Wait, module 15? NCCER?
Ron; Great Channel!
I'm not an AC Tech, but have some electrical/mechanical background. My home unit has stopped producing cold air, and I'm being told that the compressor is bad. How can I test it, and if it needs replacing, does this mean my entire system must be recharged with fresh freon? Cant the freon in the system be recovered and reused?
You can ohm the compressor out to see if it’s bad. I wouldn’t reuse the Freon. If the compressor is shorted, The Freon will be contaminated.
good video
Appreciate the info. More commercial components info plzzzzzzzzzz
Hi Ron, my name is Richard and I would like to know if you have a separate course on reading wiring diagram and schematic and if so I would like to get involved. Please let me know, thank you.
This teacher is Better than the foolish instructors at the refrigeration school down here in Phoenix AZ
Did you got to school there?
my unit wont come on...i relace the contactor...and it still dont come om.....but when i press the button inside the contactor the unit works but when i let it go it shuts down?????can you please help
Sounds like you are not getting 24v call to your condenser. Could be your thermostat or something in your air handler.
I'm replacing a single pole contactor on my condenser unit...and wish to be mindful of both the contactor orientation and also the contactor connection labels. Unfortunately....there does not seem to be an industry-wide labelling consistency, on the single pole contactor originally installed ( with a shunt side....like you show here)...as to L1, L2, T1 and T2 connections. For example, as I view my vertically installed contactor, the bottom/left is L1.....the bottom/right is L2...and (of course, to match) the top left is T1 and the top/right is T2. Connections L1/T1 is bridged, or shunted.....L2/T2 has the on/off contacts. The replacement has the contacts between the L1/T1 side...and the bridge on the L2/T2 side. Also assumes "L" on top, based on the written wording orientation.
So....two questions.
1.) Can I install the new unit upside down such that the L side is "down", to capture my incoming line power as before? ( I say "upside down" based on how the text is printed on the new unit). Doing this would also mimic the original in having the right side having the contacts, ...and the left-side bridged.....making a better match with the original wiring routing.
2.).....to comply with the original wiring schematic glued to the inside cover....the "new" bottom right would now show a L1 tag, whereas the original shows L2 ( etc...with all other connections labelled "wrong" also). Should I scratch off the numerical part of the T and L tags so that it doesn't look in conflict with the attached schematic?....thinking of the "next guy", especially if it isn't "me".
what is the reason a bus bar keeps the other pole powered up ? what would happen if you used a double contactor ?
Maybe it runs ok or maybe the fan won't start or will run backwards. The bus bar allows voltage to be running or flowing in the direction intended for that motor and it's windings. That's why when the contactor gets pulled in power is already flowing smoothly through it's windings and no problems can occur with voltage paths. Nice smooth starts.
So why does the side of the contactor stick out until powered up?
There is a spring that hold it up.
I have a problem with my a.c. split unit . Will not cut on . I replace both contactor and thermostat and replace wire from thermostat on inside to inside blower still nothing and I'm got power
Christi Moore u find out? same probelm here
If you have power out door to your uint but not in side it could be your Circuit board on the other unit
People keep saying board but not which board.... Check the board in your air handler. Under the house or in your basement/ attic
super great...
thank you
L1 goes to the compressor but the another one?
Why is one side (pole) of the contactor alway on?
Troy Simpson ...It’s just a “pass-through”. The contactor is a single pole switch.....it breaks and makes only one leg of the power to the device being controlled. The other leg is not switched. If both legs of the power are controlled you have a double pole switch. On the contactor , there are two connection points on the output side. This is a convenience for simplified connection to the controlled device. For example, if you were installing a new fan, the two power wires would be attached to the two output points on the contactor. One path is through the make/break side and one is through the pass-through side. It makes for cleaner wiring.
My question is I am installing a hard start kit I know the red goes to common on the capacitor and a yellow goes to harm. Does the black Wire go on the top or the bottom of the Really on the black wires.
Thank you in advance.
Thanks,
I have a LG outdoor unit of witch the fan and compressor are not working. There is no contactor like the one yoy subscribed. The PCB contains a few relays that probably have the same function.
My question: what conditions are checked before the relays are activated (supply voltage, pressure ....??).
Han Alink I dont know if I can answer you that well as Im an electrician, but the Y connection is for cooling systems so a thermostat closes on high temp and sends voltage to the control board from there the compressor contactor should close and start up based upon the thermostat. notice that in this diagram k1 is controlled from y1 (y2 is for 2 stage or bigger units, however the fridge man describes it)
Good show........
GREGORY BEARD Thanks!
good job
raymundo canonigo Thanks!
HVAC diagrams can be a bad example of good "ladder diagrams" they have so many MFG symbols , but they can be learned. Nothing like keeping a "scrapbook" of MFG diagrams,and symbols, in you truck. It's a good to point out, that wiring diagrams are shown "denergized" , with the exception of "FIRE ALARMS", that are shown energized.
I'm sad man because I'm deciding to go to school for this and I can't even get this video. Not that it's not clear , I just feel dumb man, but I never did electrical before. :( . This seems like it's elementary in electrical like the abc's right?
no offence to the guy teaching the video, im sure his good at hvac stuff, but when it comes to electrical he doesnt really explain it well. You need an electrician to teach you this stuff. This guys explanation is poor.
I was thrown to the wolves in HVAC school. Instructor tore out every single wire and said here’s the schematics wire the thing back up. Holy Crap ! It was either sink or swim, schematics didn’t look nothing like the unit I was learning to re-wire.
Reyna cruz
👍👍👍 all I can say
I am also an HVAC&R Instructor with 26 years in field and enjoy your videos but feel you may be able to polish the end product some with a script and more precise mouse or pointer movements, just my 2 cents.
Thanks Scott, a work in progress!!
Thanks Scott... noted and am working on it.
Copy that.
👌
👍❤️
Terrible, I asked to read a schematic. This only talks about the contacter
The diagram there is basic schematic for the contactor. Really it's not hard but it takes practice. I'm basically a beginner. It's very important to know how the components work. And I've said a similar thing to what you said because I sat in a class where they crammed 21 credit hours of information into 1 week. It's gonna take practice man. Identify, verify, verify , and check again. This is electricity and could kill you.
f
a.c
thank the gods its not in hindi. wtf
I wish you were the teacher at my school, thanks for the explanation
TankT80 hey how’s it going now with your job if you don’t mind me asking?
question: I am replacing my portable A/C plug in, which has the
normal 3 plugs ( neutral, pos and negative - however their a tiny
forth wire connected to the circuit board ... should I just cut and
wrap the forth tiny wire?
Neutral, Phase and Ground it is the normal one
L1 goes to the compressor but the another one?