Part 3 80% Gas Furnace ( wiring & IFC )

[@hvactech5829]

Thank you for your giving.....this is priceless for me, if have one million dollars, I don't think that is enough to pay for this video.

[@Ric_James]

This was such an outstanding video. I’ve watched many other videos on different HVAC channels and feel so disconnected at times. No extra frills or anything here, just an awesome teacher who’s passionate about what he does. Truly the best!

[@HVACR-Pro]

Awesome

[@damondavis4933]

What does sec mean?

[@love2hvac]

Sec means secondary or 24V dose of the transformer

[@anthonyheak3479]

Very well diagram, thanks for the video

[@danstone4856]

I have a 26 yr old Nordyne 80% gas furnace,i get no vacuum from inducer to pressure switch ,both inducer and blower check out ok but run constantly. im wondering if cracked heat exchanger is most likely why there is no vacuum . flash code says false flame or gas relay shorted. your opinion is much welcome, Thank you Dan Stone

[@love2hvac]

Make sure the switch opening and closing. Check the hose for cracks make sure the hole is clear to the inducer housing. Still no vacuum....... Pull the inducer and check the blower wheel, may be rusted out. and look I the heat exchanger. Be careful with the fiberglass gasket. C

[@luiselizalde6757]

I really have to stop watching the vidoe just to comment that these videos, and the teacher are excellent 👌 Thank you.

[@love2hvac]

That k you I appreciate that.

[@dantecabradilla2184]

im not a guy who do comments but now i was soooooo impressed and one word! "BRILLIANT"!

[@jhuh1758]

Talented Trainer !!

[@1Kngcorn]

Who the heck Thumb Down this awesome video

[@imun1ty]

This is fantastic I want to test my control boards without actually putting the boards in the Furnace to verify whether they are working or not. The only real hurdle I see is my gas furnace uses the typical flame sensor. How can I simulate that? Is there some kind of device I can make? The only other thing I need to do is figure out how to simulate the gas valve or I can just connect up the gas valve. I have an extra one. From what I’ve seen on KZbin, that flame sensor actually detects a current from within the flame and it’s like a pulsing DC current. How am I gonna be able to simulate something like that? I’ll have to build some board, maybe battery operated, and with the right circuits to pulsate a DC low current? Do you actually have to connect up the blower motor and the inducer motor for the circuitboard to generate the signals properly? I just wanna be able to read the voltages from the board leads without actually connecting the motors.

[@love2hvac]

In another one I made, I used a diode and a resistor to simulate flame rectification but I don't remember what I used. For the gas I used the exaust port of a shop vac I to a gas meter then piped that to gas valve. That way students can clock the meter, and change spuds and orifices to see the results. They can also safely adjust gas pressure before doing it live.

[@imun1ty]

They deleted my 2nd reply maybe because I made referrals to other sites? Anyhow will a frequency generator, generating a pulsed square wave work? It’s around 10-35 milliamp output.

[@love2hvac]

I don't know, it's with a try!

[@imun1ty]

I’ll just connect a diode and resistor is series with the 24 volt flame sensor connector on control board and the other end of the diode and resistor to ground this should simulate the pulses of very small current around 40-50mA.

[@imun1ty]

@@love2hvac got it to work. I used a simple relay to delay the flame sensor activation , in other the words the has valve and igniter start then the flame sensor maybe in that order but besides faking it with a diode and resistor I connected power from gas value to relay which then switches the other side of the relay for the flame sensor emulation. I was able to test both stages of the gas value. Thanks for your help.

[@afghvacr]

Thank you...

[@paulosnigusie547]

your customers and students are blessed to have you around i wish you are in my town thanks for beautiful explanation

[@garypoplin4599]

8:12 - The identified conductor is connected to the “neutral” supply wire. This conductor can also be identified with a solid or dashed black line (or white on a black supply cable). The neutral conductor in 120 volt house wiring is usually identified as white. 14:35 - technically it’s also two wires! The board is tf second “wire” to complete the circuit.

[@GotchaplumberGotchahvac]

Ty: so does 120v come from wire(hot, black thru door switch) & neutrsl to board first & then to transformer in that order v. other way around?

[@eddiegomez3628]

Where do I conpare ohmes to? Installation manual will tell me? I usually troubleshoot with Volts and Continuity.

[@love2hvac]

Some manufactures publish this. Once upon a time there was a standard, now there is a big variance.

[@eddiegomez3628]

@@love2hvac Big Variance?! Great lol. Thank you!

[@love2hvac]

Hot surface ignitors in ohms Norton 601 50-300 Norton 401 1-6 Norton 201 45-90 Norton 271 40-75 Norton 201N 45- 250 Norton 231T 40-90 Honeywell q3200u 45-90 Honeywell q3400a 4-10 WR 767a 40-75 WR 768a 11-19 WR 21D64 8-15 Cardium 50-250

[@mikev.1034]

Perfect explanation 👍👍

[@PatIreland]

PLEASE post a link in the description to Parts I and II. Can't find them.

[@love2hvac]

If you go to may page, I have a play list set up, under gas heat they should be all listed. I will post the links below.

[@love2hvac]

Part 1 kzbin.info/www/bejne/d3msY2x9ZcaBl5o

[@love2hvac]

Part 2 kzbin.info/www/bejne/fYrHf3aBjtp5jqM

[@andybauer4363]

Thanks. Great explanation.

[@sarbbhamra6758]

Thank you so much for sharing this video. Amazing instructor. I wish I had you for teaching hvac courses. I learned more watching this video then going to school.god bless you.

[@ritchpoint]

Thanks for putting this out. First time on ur channel. I have just subscribed. Keep the good job going.

[@GotchaplumberGotchahvac]

Great explanation ... pic is a tad difficult to see.

[@thodovlog3284]

It's great video. 1 subscribed and 1 like for "YOU". Thank you !

[@russm1757]

first time viewer, lots of detail explained very understandably. excellent job. will subscribe

[@UltraHydrophobiccoat]

Wow, excellent demonstration. Couldn't believe this is free! You have to pay a fortune for it at local HVAC program.

[@PatIreland]

This is a GREAT video. Concise, and with the visuals, VERY understandable! Thank you.

[@billb.4901]

If furnace wiring gets damaged, what type of wire do you use to replace it? I’ve never seen anybody on KZbin that address is the type of wiring used in the air conditioning and furnace circuitry inside the actually units. Thank you

[@love2hvac]

Great question! We should be using appliance rated wire (AWM) appliance wiring material also known as high temperature wire. I believe there is a number that goes with this, I will have to look it up. Certainly not the tinned cheap Amazon wire that is dangerous. I will address this when I get around to doing the electrical section.

[@BB-ze5ct]

Great Chanel

[@jimbarron8688]

Your terminology when checking the fuse with voltage is incorrect. A good fuse will display zero volts 'across' it, while a blown fuse or "open" fuse will display 24 volts across it.

[@love2hvac]

You are 100% correct, I didn't realize I said it backwards. Douhhhh, I need to correct that, thank you!

[@ND-fy3wu]

Ty, this video is amazing and super standing out, this one gives a super clear and clean explaination to basically everything about a regular furnace, when ppl understand this video, ppl understand everything of a furnace. Thank you so much for this neat job.

[@love2hvac]

Thank you! that makes my day

[@williamhorton273]

Another incredibly explanatory video, you are very appreciated.

[@mohammadiqbalkhan2888]

The best program in its class. Thank you for sharing.

[@cuocsongomy2215]

The best explanation on this earth ❤️

[@chuckguerrero9869]

Thanks so much for this short mini lesson. Im a hvac tech and it was very refreshing!

[@georgeghitau8976]

This is video is an outstanding lesson for HVAC field, especially for novice or entry level, or home owners which try to save some money from spending out on repairs/purchasing new equipment based on "advices/ recommendations" received from HVAC technicians on their service call/assessments on your furnace . Highly recommended, I subscribed in the first 10 minutes of presentation as well liked the video... Looking forward for more video lessons in this field PS: In case you have any friends in the southwestern Ontario please let me know for calling them to come over for maintenance and repairs on my HVAC equipment. Thank you.

[@rogerf3622]

Great presentation! Most through explanation I’ve seen. I am assuming you had some type of insulator under your circuit board protecting the board from the grounded plate.

[@love2hvac]

I think I used runner isolator pads from a condensing unit.

[@DavidHernandez-gt9bo]

Awesome component demonstration !!!! Simplicity at its finest ! 👍

[@obiemains1367]

Thank you! About to have 4 days off from school. Gonna watch this 100 more times til I have it mastered! You Rock Brother!

[@love2hvac]

A hot surface ignitor is more common than the sparknognitor. The only difference is 2 wires to the HSI, and the HSI will energize before the Gas valve valve energizes so it has time to heat up. As soon as I get one I will do a video on it too.

[@integrity5264]

thanks for sharing .

[@sonnguyen-ve7gn]

The best video I know so far

[@richregan8911]

I really appreciate these videos. What size is the pressure switch tubing? I need to order some to stock in my kit.

[@love2hvac]

1/4 and 3/16

[@PBS-nm1uu]

how do you know what relay control what ??? Also how did you learn how to read the board?? thanks

[@love2hvac]

You can turn the board over and flow the solder patches from the plug terminal to the relay. It is important to know it's not necessary to do so. In HVAC service the entire board is replaced. I have fixed some boards before but I do not know of anybody else that does so. Reading boards would enter into electronics specialty.

[@morrisdaft8]

Thank you

[@johnokeefe5315]

Excellent video Ty, your by far the best instructor.

[@love2hvac]

Thank you. There are plenty better then me but I do appreciate the compliment.

[@CoachTobyXL]

Ty, can you check the high limit and the rollout using ohms?

[@love2hvac]

Yes, Remove the wires It should read 0 ohms, for any closed switch.

[@roberts1159]

Great presentation of the wiring for a 80% gas furnace. Assume this setup was for a gas pack since it used a spark igniter. Might have been useful to show a hot surface igniter just for reference although that’s just how this board worked. But great explanation !

[@love2hvac]

Thank you, I do plan on a video the same way with a hot surface ignitor.

[@roberts1159]

@@love2hvac sounds good ! Liked and subscribed to your channel.

[@andrewd1795]

You are a great teacher. I have learned so much from your videos. Thank you so much. Do you cover Commercial applications as well?

[@love2hvac]

Im going to make residential in the correct order then I will make commercial videos. I already have several recorded

[@andrewd1795]

@@love2hvac That's great. I changed careers at 33 and have no previous background in the field. Watching your videos have helped me so much. Thanks again I am looking forward to those new videos.

[@أحمدمصطفي-ذ9ج]

Very good

[@aamirshahzad8060]

Excellent stuff.

[@philwall6223]

50 yes in the trade. Best video I've ever seen.

[@love2hvac]

Thank you Phil

[@matthewpham2665]

Thanks for posting this. You are such an excellent instructor. I just subscribed and plan to watch many of your videos about HVAC.

[@love2hvac]

Thank you Matthew!

[@Synergy-95]

Why did the fuse pop at 23:23?

[@love2hvac]

Fuse or the limit?

[@Synergy-95]

@@love2hvac I believe I saw the 3 amp fuse pop on the control board and a new one was put on I’m not sure what made it pop

[@love2hvac]

I will have to go back and look. Probably one of their terminals touched the metal board

[@Synergy-95]

@@love2hvac thanks man!

[@coldfinger459sub0]

Your channel is just recommended to me. It’s good to see you’re putting such good content on video for young upcoming tradesmen who may not have access to schools due to location or finances.