Gas Furnace Overview w/ AC Service Tech

[@acservicetechchannel]

It was a pleasure to do these trainings with Bryan! Enjoyed every bit! Great job putting this together Bryan!

[@chadegillham1165]

Love seeing my two "go-to" HVACR channels coming together. You guys dont understand how much you help!

[@DanO181919]

Great job Craig! It’s like you’ve done this before. JK. Great team!

[@brianellifritz5294]

Excellent training video!!!

[@davidgibson9781]

This was awesome Craig. Y'all just made it so simple to understand. Great collab!

[@ronaldclark8187]

Good to see you at different venues.

[@frankamaral3947]

this is the best technical explanation of gas furnace availabe on you tube from craig

[@blackishpariah]

Two best hvac channels on KZbin

[@timrob0420]

Holy shit, best two HVAC channels on you tube unite. Now where is grayfurnaceman?

[@jimbola77]

Dang Craig is the bible of ac!!!! thank you Craig for sharing.

[@lancerudy9934]

Nice to see you guys getting together for videos. Thanks

[@johnguerrero4305]

In the HVAC field, these two gentlemen are second to none! The only thing missing on these two are their capes!

[@markpayne6803]

John kind of stubbled upon this video could you give me a name and address for further info of the 2 men who made tis video Thanks

[@OcRefrig]

Lol.

[@Larrye123]

I'm taking heating hvac for a 2nd time this year. The pandemic put everything on line for the first semester. This guy did a great job showing you a lot of info quickly but concisely. Much better than what we had online for $2,500!

[@Silky_boi]

Awesome collab. Craig's videos and book have helped me step up my game and have earned more money and greater pride in my work.

[@youngjedi5599]

Epic!! Top two HVAC channels I follow.

[@luke9129]

Absolutely the best HVAC Channel

[@joejesko7410]

HVAC School KZbin video's and Craig's (AC Service Tech channel) are at the top of my watch list. Nice props to Craig, it's no wonder you guy are friends. You both are extremely knowledgeable and share it with us, for which I'm extremely grateful. I've learned so much watching all these videos, day after day. Please keep it up.

[@mitchellarmyguy2515]

This is the difference between knowing your job, and actually knowing your shit. He is running through this like he is calling off members of his family. He knows this information without doubt.

[@matthewedwardsnyder]

Craig is the best. Watch his videos!

[@markpayne6803]

Been doing this work over 20 years finally someone told me what Ive been doing wrong never ever think you as a tech know everything finally a descent explanation of a 90 % unit plus mentioning the pressure switch tool by Fieldpiece I am quilty of using my breath for checking pressure switces always guessing if I did my troubleshooting proper and to me I love troubleshooting and pride myself on doing it right Maybe you 2 fellows can get together and make a video available to the industry what a nice refresher course Thanks a trillion love your stuff

[@oscarmontalvan6866]

Great videos keep them coming 👏thank s to A.C SERVICE TECH for the great help in breaking it down for the service technicians💪👍

[@richrich6235]

Two of the most informative HVAC youtube channels I go to for a quick refrence or for something new. Nice. More collabs with him please . Thanks Bryan.

[@mitchellcowan945]

It’s crazy watching both of these guys for school and seeing them team up 😆

[@joranimo9730]

Greetings from Jamaica. I'm a young technician in the field, most of what I learn in the field of Ac/ refridgeration is from videos such as these you guys post,and I just wanna say thanks in advance. Also, I would love to learn more, and I've been reading a whole lot, but reading alone won't cut it, hands on is my thing. I just finished a short course in Refrigeration, but for some reason, I would love to go deeper so that I can hand the baton to my son,nephew etc to help them get a superb skill like refrigeration.

[@DanO181919]

Two legends coming together....fantastic!

[@BartSimpson-nr1dy]

Two legends of the industry (Bob Hope and Dean Martin) Craig is Deano and Bryan must then be Bob Hope

[@enriquehvac6004]

Nice to see you guys collab, you both are awesome at what you do. I’ve learned a lot from you two.

[@michaelstaley9979]

Great video. I have learned a lot from both of your channels. I have Craig's book and it has taught me a lot. Please continue to keep making great videos like this.

[@HVAC544]

Love craig he is so well versed in both installation and service side of the industry. Whether its oil, gas, heat pumps, and even mini splits. I found many of his control videos very helpful.

[@justinnegrete6803]

Two legends in the game what a nice video y'all should do more videos forsure

[@ryanmcananey6245]

Awesome to see Craig on the channel. Learned a ton from his videos and book, great teacher with solid info.

[@loleromero3113]

Thank you so much for this beautiful education thanks all people do possible thank you everyone one

[@zoubirgaoua7521]

Great video. Craig and Bryan, this is awsome. Thanks

[@ed6837]

EXCELLENT VIDEO!!!!! Funny, I am in Massachusetts and in the code here we don't allow galvanized for gas. What I herd was that they had cases of the galvanized coating plugging a pin hole in the pipe where it would pass a test and leak later

[@tunaman2200]

Thank you Craig! So much good info for new techs like me.

[@CHOMAHOMA]

Great video. Greg is a good teacher. Thank you.

[@ItMaker5000XL]

Wow, a true master. Fantastic stuff.

[@georgeian3243]

Flame rectification circuit produces a partially rectified pulsing DC signal, it’s not completely rectified. You can still measure AC micro amps too, typically 25 ac micro amps or so, however, control board only interested in DC micro amps. True that many flame rods are replaced needlessly, but flame rods are prone to corrosion caused by contaminated combustion air. One important bit of information needed for pressure switch troubleshooting is how much deep negative pressure is required to close the switch at the start of the cycle. Manufacturer should supply this info. There’s only 3 possible pressure switch faults: 1.closed at the start of the cycle, 2. doesn’t close at the start of the cycle 3. opens during the cycle. Thank you for all your informative videos.

[@tomasramirez1984]

Thank you very much guys for how you guys explained about this.

[@hvacir9176]

WOW, you got a Gem right there. thanks for sharing

[@mitchellcowan945]

Just in time for my furnace test 😊😊

[@loganstewart8678]

Great walk through!

[@kennethdandurand3472]

So, do EVERY ONE a favor and take the two collective minds and make them into an app. It is scary seeing so much knowledge in the two.

[@sahilverma4443]

Brilliant video . I am a gas technician too. I really like it.

[@lancerudy9934]

Very nice video. Thanks

[@sman3079]

He knows it so much he never stumbles

[@derekmc9580]

I use nylog on all flair fittings. For refrigerant or gas both.

[@HVACR_Dad]

This is LEGENDARY

[@juanacosta2788]

Great videos good notes ...for me keep it comeing

[@Abdul_Shakoor_Anwar_Kamboh]

You did explained about heat exchanger in the whole video please explain it and extend this vidro

[@steveo7624]

Always great info

[@786hidalgo]

Thank you for teaching and explaining everything excellent I would like to be your student....

[@TheRealoldcar]

Great. Video. Is there any protection or detection when the gas valve malfunctions and does not shutoff?

[@saulsanchez9531]

When will you release the book about how to fix a furnace and air Handler?

[@lancerudy9934]

Is the pressure switch in a negative reading?

[@brianmutascio8325]

Great Video !! Is it the heat of the flame, or the flame itself, that touches the flame sensor rod that generates the Micro amp rectification signal.

[@HVACS]

The flame itself

[@efco24]

The control board is what generates the "signal". When there is no flame the signal goes to the end of the flame rod that's insulated from ground and just sits there. As soon as the flame is established, the signal passes through the flame to the grounded burners. Now the control board knows two things, the gas valve is energized AND there is current moving through the flame rod, therefore it is safe to keep running. So why does it rectify? The signal from the board is alternating current. Now think like this. Say you're standing between a barn and soda can and you have a slingshot and a hand full of ball bearings. Shoot toward the barn and how many times will you hit it? Shoot towards the can and how many times will you hit it? In this case, the BB's are electrons, the air you're shooting through is the flame, the barn is the burners and the soda can is the flame rod. It's easy for the the electrons to hit the large burners, not so easy to hit the flame rod. So the board pushes a ton of electrons from the flame rod, through the flame and to the grounded burners. The when it tries to pull them back, the electrons go from the burner face, through the flame and mostly miss the flame rod. Hence the rectification.

[@natepeterson7145]

To the new techs if you have to have gas company change meter to house because of low incoming pressure be sure to go back after it's done to adjust gas pressure going to manifold of furnace.

[@rojobandito318]

What do you mean you don't work on them very often? No condensing furnaces in Florida?

[@HVACS]

Almost none

[@ronmason5861]

Thank you!

[@darrenboyd1991]

Love it . Keep it coming

[@juvenileloki3auz]

Question: If the secondary heat exchanger is a tube and fin coil, Does this need periodic cleaning the same as other tube and fin coils to prevent build up of particulate or a film factor?

[@paulgaras2606]

Effective air filtration is usually adequate to prevent that. The fins are never wet like they would be on an evaporator and they are spaced less densely than an evaporator. This prevents the secondary from getting too dirty. However, filter bypass, crappy filters and failure to change them can all allow dirt and debris to accumulate on the secondary. In that case, you may wind up having to pull the blower and vacuum the secondary off.

[@lancerudy9934]

Can you show how to change to propane!.

[@tntheatingandairllc]

Wow great great video 👍👍

[@jamesguzzi4286]

Great stuff!

[@lancerudy9934]

Where can you buy the gas code 2021 book?

[@AliAhmadi-hq9pj]

Thanks

[@robertpeters9438]

I wish you would do an episode on capacity needed for sine wave generator inverters for high efficiency HVAC.

[@MJ-iy4fb]

Craig knows HVAC, here's a question for anyone, do those flame rods ever have a special coating on them? and a bonus question, what does PF stand for on the pressure switches?

[@OcRefrig]

Good video ! Liked 567.

[@lancerudy9934]

Is the gas piping galvanized?

[@thermodynamicsforhvacibr-hl4lf]

Awesome. Great job.

[@waterheaterservices]

Superb

[@publicmail2]

So voltage and small current flows thru the flame for verification. Greg's channel is great: kzbin.info/door/OZR-1IqsAer9wzlvFgb4mA

[@jameswestii454]

Hoping to pick your brain. I have a 100,000 (input) btu 80% Gas furnace in my 2 story home that is 2500 sq. ft. but there’s a 3 ton AC unit here as well but both units do great heating and cooling all season(s). Since this furnace specs are 5ton, 2000 cfm ECM motor, should my fan be set at 1200 cfm for the cooling speed? I realize the AC is undersized for whatever reason but it works great. Anything here that you would see as being an issue? Thank you for your time.

[@jsosa2727]

💪🏼

[@igoiks]

Man I tell you what they can’t even install goodman right for training purposes, galvanized pipe for gas 👌

[@oldmoodkill]

They address this at the end of the video. Galvanized is fine and preferred in ocean climates.

[@tptm100]

Is that gas line "black pipe", it looks like it is a galvanizedpipe

[@BartSimpson-nr1dy]

I’m sure these 2 legends know better than to plumb a gas line with galvanized pipe. Probably someone had a little extra time and silver paint would be my guess

[@tptm100]

@@BartSimpson-nr1dy Yes I know but it is a classroom demo, what kind of pipe does it look like? Be honest.

[@HVACS]

1. It is galvanized 2. We didn't pipe it 3. Galvanized is widely used and AHJ accepted in many markets 4. Craig addresses this in the video

[@tptm100]

@@HVACS Yes I am just @ the 30 minutes into the video where they addressed that. Thanks for all the great knowledge you guys extend to us, much appreciated.

[@joeshearer1247]

Tom Thumb I've been told you shouldn't use galvanized pipe too but honestly I never understood why not because it's a superior product to black iron

[@kennethblau3978]

You never mentioned to the viewer what Brand and model number. The gas furnace is. Please supply use that information so that we could go on line and down load the service manual from the manufacture. Then all of the technical information for the electrical circuit diagram well be available to study. And the gas valve settings well be explained! Please reply back ken HVAC

[@HVACRILLA]

Epic

[@travisewing1795]

3 pressure switches smh, so much stuff to go wrong amd break on that puppy

[@maness2112]

I pity the fool who buys this furnace. Lol.

[@williardbillmore5713]

Heat does not rise. Hot air rises. Heat radiates. Shame on you.

[@coldfinger459sub0]

That’s just got a pin to my favorites. The melting of two great HVAC minds of education, just add Jim Bergman in there and Bill spoon and we need to erect a new Mount Rushmore.

[@johnguerrero4305]

Can’t have the Rushmore, unless Greyfurnaceman is on it as well!

[@coldfinger459sub0]

@@johnguerrero4305 True been watching him for years to. How about the first forefront guys who started it in the beginning on KZbin Dr. Zarcoff who is the little guy with glasses think his name was Eric .

[@steveo7624]

Always great info