How to Read Furnace Wiring Diagram
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- Опубліковано 30 вер 2024
- How to read a furnace wiring diagram. In this video I show how to "read" or follow the wires on a gas furnace wiring diagram. I go over a schematic diagram and a ladder diagram and explain how the different components get energized and it what order. The diagram I am using is actually a pretty simple one compared to many of the others out there. I selected this one because it would be easier to follow along on it. If you were out in the HVAC field though, preferably you should have the furnace operation manual along with the wiring diagram. The manual will tell you which components get energized, in what order, and how long they are energized for. As I explain in the video, the wiring diagram is not straightforward and unless you know how the furnace works, it will be very difficult to figure out the wiring diagram.
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🎞️ Videos Referenced:
How to Wire AC Unit:
• How To Wire AC Unit - ...
AC Wiring Diagram Full:
• How to Read AC Wiring ...
Furnace Sequence of Operation:
• How a Furnace Works - ...
Most Common Furnace Fix (Flame Sensor):
• Furnace Not Working - ...
Flame Sensor Troubleshooting:
• Furnace Not Working - ...
How to Check and Replace Ignitor:
• Furnace Not Igniting -...
10 Reasons Why Furnace Overheats:
• Furnace Overheating - ...
High Limit Switch Stuck Open:
• Furnace Not Blowing Ho...
10 Pressure Switch Problems and Fixes:
• Furnace Pressure Switc...
How to Troubleshoot Pressure Switch:
• How to Test Pressure S...
Furnace Error Code Basics:
• Furnace Blowing Cold A...
How a 2 Stage Furnace Works:
• How a Two Stage Gas Fu...
How to Check Furnace Inducer Motor:
• Inducer Motor Not Comi...
Flame Rollout Switch Tripped:
• Furnace Flame Roll Out...
Basic Thermostat Wiring:
• Basic Thermostat Wirin...
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📙 For Many More Furnace Repair Videos, Visit My Furnace Playlist:
• Furnace Playlist
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For More Repair Videos:
🔌 Dryer Repair Playlist:
• Dryer Playlist
🧺 Washer Repair Playlist:
• Washer Playlist
❄️ AC Repair Playlist:
• Air Conditioner Playlist
💧 Water Heater Playlist:
• Water Heater Playlist
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This video is for educational purposes. All appliance and HVAC repair work should be done by a trained professional. Word of Advice TV is not responsible for any possible damages or injuries caused by the use or misuse of the provided information.
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#furnacewiringdiagram #howtoreadfurnacewiringdiagram #furnacewiringschematic #furnacewiring
➡ More Videos For Further Information:
How to Wire A/C Condenser Unit:
ua-cam.com/video/KCanZEsLVEI/v-deo.html
How to Wire Thermostat:
ua-cam.com/video/VknvJ9POYDo/v-deo.html
How to Wire Air Conditioner Compressor:
ua-cam.com/video/GhBTVn5CHBE/v-deo.html
10 Ways to Splice Wires Together:
ua-cam.com/video/ihpNCVk1lF0/v-deo.html
How to Read A/C Wiring Diagram:
ua-cam.com/video/2MSedAkirqw/v-deo.html
How to Read Water Heater Wiring Diagram:
ua-cam.com/video/TX8SuHK1esY/v-deo.html
Basic Thermostat Wiring Diagram:
ua-cam.com/video/jDLz3REPTWM/v-deo.html
How to Wire Indoor Blower Motor:
ua-cam.com/video/4S8TZd-45bY/v-deo.html
How to Wire Outdoor Condenser Fan Motor:
ua-cam.com/video/VlMhvwrpimE/v-deo.html
Is Common and Ground The Same Thing:
ua-cam.com/video/wiKDlIlbiP4/v-deo.html
Electrical Symbols and Meanings for Switches:
ua-cam.com/video/ngQCmR_w9QU/v-deo.html
Ohm's Law Explained:
ua-cam.com/video/sILl7p_J1UU/v-deo.html
I am an 18 year old service tech. Been working in the field for almost 7 months and yesterday I came across a problem where I didn't know what to do, and watching this video now I realize I might've ordered the wrong part 😁. Thank you for the very detailed explanation of the diagram. Will help me out a lot in the future.
You're welcome! Glad to hear it helped. And a tech that says he never ordered a wrong part is a lying tech 😉 happens to all of us.
Hi jay I am looking for wiring diagram for old GE gas furnace. Do you know how to get those? Thanks Robert
This guy explains everything better than my college teacher
Yes he does!!
I just came across your video and I must say that this is one of the best videos I have found. Very well explained in great detail. I learned a great deal from this video. I'm looking to replace my one stage for a two-stage furnace. Thank you for sharing your knowledge with us.
Oh my gosh this guy explained way way much better than my hvac collage teacher..
This is a great and detailed way of going through a furnace wiring diagram. I really appreciate it. Thank you.
Love the way you teach! I’m sure many of us will learn a lot from the amazing way you lay out your lessons.
Happy New Years! Question; can you send me a copy of the wire diagram in PDF or whatever format you have?
Hello my good buddy 👍👌👋✌️🤟🤘🤘🤟🤙👊🤜🤛. Good to see you again buddy I hope you and your family have a wonderful blessed Christmas day ever . Well I ordered bigfoot a help em up harness and it helps me with him in getting him to get up and get around.. one day he can walk well usually of the morning he can walk just like nothing happened to him and then for the rest of the day he can't walk I've been talking to the doctor and she thinks he probably has degenerative myelopathy it's a awful disease it's compared to lou gehrig disease like in human...it starts with the dog not being able to hold himself up in the hind legs and then it affects the front legs till they can't walk or get up and then it affects the breathing and that is the final stage six months is the life expectancy of it but I was reading about it and it said usually the dog will stop eating and drinking because it breaks there spirit... so I'm hoping and praying 🙏 that isn't what he has...I made a gurney board today so I can carry him in case he gets down on me and for easier transport to the doctor..we have had a really good day today he has been in very good spirits he was so happy today and has gave me some really good kisses...I also ordered Arnold a tuxedo for Xmas and I put it on him other day to see if it fits and how it looks.. he looks super sharp I wish you could have seen him im going to dress him up for Xmas because it's his birthday and I will have them a little party because I know that it's going to be my last year with Bigfoot... well buddy I hope you all have a wonderful safe and healthy and happy blessed holidays god bless you and your family 🙏 Jay I will be praying for you all for smooth sailing much love from me and Arnold and bigfoot to you all
Hello David my friend!! 🤙🤙🤛🤛✌✌👌👌🐕🐕👨 I'm pleased to hear that Bigfoot is doing good! Not at his best but at least things did not digress further. Great that he had a very good day today and that you are now much more prepared in the case of things getting worse! Hahaha I would love to see Arnold in a tuxedo. If you'll have the chance, send it to my email (found at the bottom of the video description). I get a lot of emails so many of them don't get answered but I would keep a lookout for yours. We hope you stay safe and healthy as well and have the best Christmas ever!! Prayers and blessings from us as well! Pass on my greetings to Arnold and Bigfoot too 🐕🐕🤙🤙
Great video !!! I actually followed the flow and logic on what turned on and why ! Thank you so much for explaining how each stage turned on and off as heat or cold is called for.
You are so welcome! I'm happy that the video was easy to follow, that's what I hope to always do 🙂
Great video, but you might want to look at the panel switch you first said was normally closed...It's NO, mechanically held closed by the panel door...I'm still watching, if you corrected that I'm in error, but first off, I noticed it...Others probably have too...Thanks again for the video.
in the beginning of your video, you said input AC power Hot comes into L2,, ............ Really AC Hot, it comes in L1,, Neural comes into L2 Really. on a 115 Ac Volt system
Parabéns daqui do Brasil, gostei muito da sua explicação, consegui entender perfeitamente Parabéns!!!!
I see that the Geico gecko stopped in to remind you that your car insurance policy was probably due. LOL
Lol, I actually have Geico insurance too 😄
I'm a newbie For HVAC-R AND I STILL NEED MORE KNOWLEDGE. THANK YOU FOR THESE VIDEOS BUT NOW MY MAIN PROBLEM IS BEING ABLE TO PASS THE EPA 608 SO I COULD BECOME CERTIFIED. IM STILL HAVING PROBLEMS WITH THE EPA 608 WHICH IS HARD TO REMEMBER I AM STILL READING THE EPA 608 MANUAL AND DOING THE PRACTICE TEST BUT THE TEST SO MANY QUESTIONS THAT ARE RANDOMLY GIVEN I AM AFRAID TO TAKE IT AND NOT PASS IT. IS THERE AWAY THAT SOMEBODY USED LEARN THE EPA 608 THAT MADE IT EASIER TO REMEMBER PLEASE ADVISE. THANK YOU! HVAC-R COLLEAGUES
Hello I have problem about my heater water won't stay burn long and the water is not hot. What is problem about that it's A.O. Smith GCV 40100
Saludos amigos aquí buscando suscriptores !
Wow, Awesome description and explanation your missing your calling you should be teaching.👍🏻
Ha, thanks Alpha Male! 😄
@@WordofAdviceTV i agree, should be a instructor at a technical college
I absolutely agree
I did not get the dad joke. Edit: actually now that I revisited the video I get the joke. Thanks for everything.
Excellent information and well laid out.
Thank you Ron!
How many wires for 2 stage thermostat? Do you need to order a two-stage thermostat or is this standard?
When does a make up cycle occur or switching to high position gas valve?
Exelente information thanks for take the time and do so wonderful tutorial.
I wondered could should any tutorial and electric units with a heater pump system
And how the thermostat wires are different from any other thermostat
Big Fan, keep up the good work???
Bob Ross would be very proud of your painting ... Lol ... And I wouldn't ''udder '' a word about my mother in law ... Lol ... Great presentation Jay ... Hey to cameraperson ... And if you couldn't find your green grounding pen ,you could always use that Gecko ... I kill me ...Lol
Hello eddy say hello to trixie for me and Arnold and bigfoot ✌️🐕🐕
Lol! I love the wit in all your comments Eddy 😄 They're always fun to read. Hahaha use the gecko... 😂 Your "I kill me" phrase reminds me of the egg joke. I won't spoil it here and leave it for the next video. Actually I think the next video is a mayonnaise video where I wont be talking.. Hmm.. Maybe in 2 weeks then. (these non-hvac videos drive some of my subscribers up the wall hehe 😇 )
@@davidmckinney6577 Will do ...
Thank you very much sir, please tell me boiler control circuit diagram electrical and instrument
Wiring in HVAC in general is still pretty overwhelming for me. I'm gradually learning more and more. I know one day it will all just click for me, but for now I'm still learning.
Excellent and simple understanding for home owners.. thanks a lot.
You're welcome! Thank you for watching and commenting 🙂 have a great rest of the weekend!
I recommend you to open a business q&a, advice and help online and make some profit.. sometimes they are simple questions you can answer .. thanks
@Karlos Dozxa That's an interesting idea. Thank you for the suggestion!
May buena explication good
Great video. Can you have a video in the future to explain how a two-stage furnace works? During the first stage which usually last about 15 minutes, what is the gas pressure going to the furnace. Once 15 minutes has elapsed and the temperature in the house is NOT at the desired temperature, the second stage starts. Does the gas pressure go down or what happens? Thanks
Any idea of the temperature inside is greater then the temperature settings ???
About 5 degrees different.
20:55 my dealer is awesome , I m seeing reptilians running over furnace blue print
Haha glad you enjoyed the gecko! 😄 Thanks for watching, have a Merry Christmas!
The gecko is not afraid of you. Is that your pet?
@@doming258 No, that is a wild gecko. There are many geckos roaming around where we live. I can't touch them or anything but as long as there are no sudden movements, the gecko is pretty comfortable getting close.
Hey, in the first few seconds of your video, I thought you were rapping. Actually why not rap with your excellent presentation of the tutorial.
Start with something short and popular. You can be a fantastic DIY rapper one day.
Excellent video as always
You're right! I just listened to it again and the background beats do sound like some sort of rap track. I appreciate your support and motivation to pursue new things 😄😄 Glad you enjoyed the video, I hope you have a great rest of the weekend!
You said the high limit switch goes to #5, it looks like you connected to #8. I could be wrong though. Thanks for taking the time and effort to share your wealth of information.
Yeah.. Those connections are close to each other and I was using thick markers which doesn't help.. I was indeed wrong, the two wires from the limit switch actually go to 11 and 6. I just looked at the paper version of it right now. What looked like a 5 to me was actually a 6 and the 5 is next to it. Thank you for catching the error!
this was a great video, I always learn a lot with you, thanks for making this valuable content!
Excellent! Good way to speak clearly with good tone to keep attentive but not too cheesy lol. Love the pictures you used to follow along (real world examples) and the color code helps too of course when using the blueprint drawing to detail circuit logic and current travel paths. Helped me a lot and was a review for me, will be checking out the other topics listed in the description thanks.
Parrots in the air and geckos on the table - why do you even need a furnace?
I think after the transformer in the 24V comon you did yellow same as the 115v, and I think the color was mean to be blue
Hey
Love ur video
Quick question...my furnace turns in blows air and shuts off in like 2-3 mins before reaching the temp on thermostat and continues until it reaches temp....I changed thermostat...what can b issue???
Your furnace is likely overheating. When it shuts off before reaching temp, does the control board blink an error code? I would replace the filter if you haven't done that yet and if it's not the filter, then watch my video on 10 reasons why a furnace overheats for more info.
I went to Coyne institute here in Chicago I'm not in the field but I understand it better now looking at your videos I graduated with all my certificates but didn't have time to capture everything like I should or would have liked i couldn't let all that money go down the drain so I was focused on just passing for the most part, thanks for taking time out your life to teach, YAH is going to bless you for this, SHALOM
Very nice. thank you.
Hi jay , BULA (fijian greeting) in the islands, what do u mean by the pressure switch works with negative pressure? Can u plz explain
Aloha Pete! The power vent motor that exhausts the combustion air from the furnace creates a suction pressure inside the fan housing. A little tube is connected from this housing to the pressure switch. Once the power vent motor starts to run, a little bit of air is sucked out of the tube which is connected to a normally open pressure switch. This causes the diaphragm inside the pressure to move and close the micro switch inside the pressure switch.
Thanks for sharing your knowledge and experience, a rare feat these days.
hi i like your videos on this board where do the y wire go to on the board ?
good job, excellent explain about diagram.
Great info. Subscribed. Boilers next please
MY name is Gabe and 6 years ago i made a career change from installing Directv to AC Installer in Palm Springs California. Installing ac in the desert is hands down the hardest job I've ever had seen that furnace coils are in the attic so to change one out takes a good 6 hours at about 130 degrees. It isn't for everybody Ive recently switched from install to service and i have learned more from you and your videos than i did at the technical school i went to. You make it very easy for me to understand and I'm really impressed with how knowledgeable you are at such a young age. Good job dude and keep up the good work. You probably helping people more than you know.
Thank you so much for doing this video. Every time i try to read one of these I get so intimidated. This helps a lot!
Excellent video, you really have the skill to explain, thanks for those excellent videos. Have a wonderful time.
This is what I was looking for, thanks!
Hi I’m in New York,any tech schools ty
You are awesome. This is exactly how it is taught. You’re doing a great thing
Thank you! Glad to hear I showed it correctly 😄
Is the common a neutral wire? Hope you and your family have a Merry Christmas?
Yes, common and neutral are the same thing. Thank you and Merry Christmas to you and family as well! 🌲🌲🌲
really your illustration is benefit full God Bless you
Thanks for video it has been really helpful
Download copy of this diagram please
Well, very well! This is the more illustrated and understanding troubleshooting tutorial I’ve ever seen. Thank you so much for kindness snd your valuable time.
This is an awsome explanation of the sequence of a furnace! I have my B Gas and have limited experience with furnaces, but this really helped give me confidence in being able to diagnose a furnace. Thank you very much!!
You're welcome, I'm glad it was helpful! Become a legend out there! 🙂👍👍👍
What is the black box on shirt? Mic?
Yes, that is a clip-on wireless mic.
Louis we have a Lennix gas heater in our attic the front panel of it has a pressure switch which shuts everything down when you remove the panel. For example if you just want to view the insides you take the panel off and then you put it back on. Well those plastic receivers and males that hold the panel on get old and break. We had this problem. We lost our power to our gas heater up in the attic and our air conditioner Heat pump. No electricity to either one of them. My wife pushed on the panel to get it in its proper position and the gas heater went on. That pressure switch is a pain in the butt if your panel is not on correctly. I’m sure this is for some models only certain ones.
Great video. Would be nice if you could in a printable document for people to follow along.
Thank you! Thats a great idea! I dont know if I can still find the one I used here but if I make more videos later, I'll try to do that.
ps where do the red and the white from the a/c go to ?
I have a question. On a two stage system for either an AC or furnace...would disconnecting the low voltage on the first stage stop the furnace/AC operation even in second stage? For example...
2 stage AC, running in second stage, if Y1 is disconnected (opened), but Y2 was left alone would the AC keep running or shut down?
2 stage furnace, running in second stage, if W1 is disconnected (opened), but W2 was left alone would the furnace keep running or shut down?
You do a great job,we are learning a lot with this kind of videos,congrats,you have a good merry Christmas with your family.
Thank you! Glad to hear the videos are helpful. I hope you and family have a Merry Christmas as well! 🌲🌲🌲
Dude, you are SO underrated, u should have millions of subscribers. You are detailed and concise, even a high schooler can learn plenty from you bud!
Older techs are assholes. Too prideful to listen to younger techs.. I see it everyday
@Wes Lawson Thank you Wes!! I appreciate that 😄😄 If the almighty UA-cam algorithm feels like it, perhaps one day the subscribers may go over a million. I wouldn't complain about that lol. 😇 Glad you enjoyed the video!! Have a great rest of the weekend!
@Straightoutofchiraq I've been under the mentorship of a few of those before too so I think I know what you mean.. But those older guys really do have a lot of knowledge. Perhaps not much about the high end new stuff but years and years of experience does make a difference. I've learned some really cool stuff from really grumpy about-to-retire techs. As long as I shut up and was respectful, most of the time they were willing to impart some wisdom upon me. 😄
@@WordofAdviceTV Never had a mentor in this trade. But I will leave it alone
Assuming you live in southern Florida. Nice there early and late in the calendar years. Hot and humid and uncomfortable in the summer obviously. The state college I attend had a link for this video, but I see all the other great videos you have put out there as well. I'll be watching more of your videos and I have subscribed to your channel. Thanks for helping out by making these videos.
How can you tell which wire from the 24v side of the transformer is hot and which wire is return? If they are hooked up backwards the voltage will be out of phase with the high side. Will this cause a problem? Might it affect the flame sensor voltage? Thank you for your outstanding videos.
How much for a new control , and are they different for gas and gas conversion burners.
The prices vary greatly. It could be $70 on one furnace and closer to $1,000 on another. The boards would stay the same.
great presentation, this is the best of the best.
Great vídeo!! Thank you 👍
Thank you , I appreciate your work. What's with the Geko ?
That's just part of the package when living in Hawaii 😄 They're little scavengers always on the lookout for a snack. I think he thought the marker was food.
You are the best teacher
Hello sir,
If i connect 120vac from other power Source to my furnace. Is it ok. Because existing power source line to furnace some time outrage of electricity due to the Weather conditon.
Yes, that should be fine. As long as the voltage is the same, it does not matter where it comes from.
Thanks brother. From your video i learned lot of.
This excellent video convinces me there is a community of hackers that rewire their furnaces using any number of controllers such as Raspberry Pi.
you are a great guy and great teacher, you are teaching me a lot I am a
retired disabled individual never work on HVAC. My schooling was far
away from engineering but interested in knowledge specially if HVAC is
replaced what happened over the last year in my house. I have a question
not directly related to the topic of this video but I am annoyed with
the installer.1- should the thermostat wires coming from thermostat to
the the furnace kept in a box I believe you call it junction box. He is
leaving in a fan like but I an thinking to buy a box and keep them away
from the hand of people even animals. 2- What do you think of putting
the furnace electrical switch in contact with the white tube drain that
collects water and drains it in an floor drain about 15 feet away.
that drains in the ground not the one outside the house. It used to be
electricity in one side and any water source in the opposite side. It
bothers me what do you think. I appreciated and have a blessed day.
Buddy, are you living in Hawaii now? Seems so, I saw the lizard!
Yes, we are now living in Hawaii 😉 I posted a few blog type videos on how our move went a few months ago. There are many of these lizards and geckos crawling around here, I love it!! 😄😄
I am a g2 gas fitter and this was a very helpful video! Keep up the great work
There should be relay for ignitor ;I believe this diagram has missed that relay.
Anyway ;you teach the best 👏👏👏
Great explanation and great video this is how it's supposed to be done with wire
Just what I was looking for, I have never worked on a furnace but I now have a job to replace three Baltur furnaces in a high rise building. So at least I know how they work now. The italian schematic for the new furnaces is a bit confusing to say the least but thanks to Jay I am slowly getting my head around it. Main problem is that there are other control panels from around 1970 on the old furnaces and of course there are no wiring diagrams that exist for them so I am really struggling to figure out what is going on there. If any one has any suggestions would like to hear from them. I only have two days to get these installed!
Thank you for your video. My air-handler does not have control board, but it is an old ac system. However, it is good to learn some stuffs from this video.
One of these vids on a ST9103a for an oil fired furnace would be great as well. Nice job.
My gas valve buzzes or rattles then it all shuts down and repeats. Bad gas valve?
Most likely yes. Sounds like bad gas valve coils.
Hi from Paris France!
Y'r the best my dear. I realy like you and i like yr videos too. Regards.
Hi There thanks for your help. Can you Please describe us what is the Meaning of " Flame sensed with Gas valve off" and how you fix it. Thanks again
That typically means that the flame sensor is shorting out to something. Most commonly, the flame rod will be touching something metal inside of the burner box or the wire going to the flame sensor is damaged or pinched somewhere. It is also possible that the control board is malfunctioning. For more info on how the flame sensor works, watch my flame sensor troubleshooting video.
@@WordofAdviceTV Thanks a lot , I will do that.
May I have one question regarding Pressure Switch: for normally-open pressure switch symbol, I found some are left side open, others are right side open, is there any difference existing?
Thanks for this video. Haven't seen furnace explaining wiring diagram .Thanks again. I love the ac wiring diagram
You're welcome! Glad you liked the wiring diagram videos 🙂
You must be so happy in your new environment now compared to Minnesota. Is there a lot of hvac work where you are now? I’m sure a lot of ac installs lol
Very well done sir ....thanks.
Liked video explanation! Who is mic made by? Nice size!!
I like the mic as well! Best one I've had so far. I'm glad I decided to splurge and buy it. It really does beat the competition. Rode Wireless Go Microphone: amzn.to/3ed5Wkv
Super super good ,thank you
I'm about to start school and I'm trying to get ahead I'm having a really hard time learning how to use a multi meter like what parts should read what. Any chance you have a video like that or can point me in a direction of one?
I know how you feel. 😅 This video will be a good crash course man: ua-cam.com/video/zr4Ow1JT9jU/v-deo.html
Good luck in school!
@@WordofAdviceTV thanks man
Great description of the operation!
I can’t help but listen to the Sandhill Crane’s in the background noise! Where are you located at to have Sandhills Crane’s?!
Where can I find a print like the one you used in this video. In a book ?
That one I simply found online by googling "gas furnace wiring diagram". But just about every gas furnace will have a schematic like that plastered to the back of the service door/access door. So if you have access to any furnace, you can just take a picture of it's diagram.
I’m in school, and reading diagrams is by far the most stressful thing I’ve gotten into so far
@Michael Sims I know how you feel! Wiring diagrams was a tough class for me too. But I think much of that was due to the fact that I did not know much about how a furnace worked... And like I said in the video, without basic furnace operation knowledge, the wiring diagram alone can be pretty confusing..
Same here! Thanks for the video!
WTF?!?! Why doesn't this channel have a gazillion subscribers and views?!? These videos are gold! People, you need to wake up!
Greetings from Greece from a hvac technician. Keep the good work... and merry Christmas to all😁
Would you know about daikin fan motor
Good jog very well explained
What’s the difference between a common and a neutral??? They always confuse me.