How Do Relays and Transformers Work in HVAC?

[@RoccoCosa-u9c]

im a hvac tech that likes to look at videos for refreshers and sir you really are a great teacher.

[@TaddyDigest]

Appreciate that brother, glad this was helpful.

[@timothygardner2974]

Some people just have the gift to explain things and make it simple. You Sir have that gift. Thank you From a avid DIY’er, one of the best vids I’ve seen on ANY subject

[@TaddyDigest]

You're welcome thank you very much for your kindness. I hope you're having a great day..

[@stevenb8410]

Great video! I'm taking HVAC classes and we went through this last night. Testing capacitors, relays, and transformers on a board like this. Never actually doing this before. Most of us were pretty confused where to start. Wish I had came across this video before hand. So good. Thank you.

[@roqueherrera2692]

DUUUUDE u just opened my eyes on relays. After 16 years of hvac 🤦🏻‍♂️. I can seriously die happy. Thank u 🙏🏼

[@TaddyDigest]

Awesome thank you so much please Share the video

[@PrevailD]

Explaining everything and then going over it very thoroughly with the multimeter really helps to reinforce and understand how things work for me. This is what makes a difference between someone who states information and someone who actually teaches. Thank you for this because this is how i learn and retain. I actually dont need to keep looking up relay and transformer videos after watching this now 😂

[@TaddyDigest]

That is my goal Thank you so so much for watching.

[@leonardcollins8122]

I liked this 3x just to make sure my like was accounted. I asked my school instructor to explain normally open verses normally closed...he could not adequately explain it like u just did. Thank u

[@jmead6121]

Thanks even with 28 yrs in the hvac service then learned installation relays still trip Me up if I need to add an temporary relay to make a say blower motor run on call till a bad cc board can be replaced as to where to land my incoming power ot line voltage vr where to land my load this video explanation helped but esp a 90 340 relay thanks again

[@TaddyDigest]

You're welcome.Thank you so much for watching

[@antoniolaracuente437]

Been in the fields for 40 years. Basically, oil burners today we're converted lots of oil burners to gas. I learned how to use the meter. And I also learn how to check my relays and Transformers. Great information, buddy, thank you.

[@TaddyDigest]

Glad you watched video so glad I made this video so glad I could Help. Please share when you can

[@oscarcaro7919]

This informative video covers relays, Contactors, transformers, Thermostats, motors. It goes to the point and covers a lot of useful information. Thank you for showing and sharing your knowledge in a simple but extremely valuable way. Please post more HVAC videos.

[@TaddyDigest]

Glad it was helpful!

[@MRHVAC2025]

@taddydigest You should show the proper usage of those crimping pliers. The part you used @15:06 is labeled NON, for use with NON insulated terminals. You should use the section labeled INS, designed for insulated terminals as shown. It makes a difference, as the one tends to damage the nylon barrel.

[@TaddyDigest]

Great video idea explaining the difference thank you

[@MechanicalManiaco]

I believe the rounded side goes on the side with wire being crimped as well as using the insulated part of the tool. If you use the pointy side on the barrel end you'll clamp down one side more than the other.

[@mgm1018]

This video was great! I was trying to make sure I knew exactly what I was doing before attempting to replace an old mercury line voltage thermostat in my basement with a new smart thermostat. The main floor Tstat was LV already, but the basement zone was HV for some reason. You made it super easy to understand that I want the heat call wire off the thermostat and the common wire to power the relay, and then the HV lines will be connected to the normally open poles that close the circuit when the control side provides power.

[@danielgomes4754]

I was having some a/c problems and came across this video. This is a good explanation on Relays and helped me a lot in figuring my problem.

[@charleswashington7576]

Good video, I want to share some info on a comment you made. Correct me if I'm wrong. Yes, sequencers do have timed delays built in and that's not the only difference. Additionally, sequencers are design to support the high amp demand that heating elements draw. Those relays like the 90340 you demonstrated are design to carry inductive loads like a condenser or blower motor. NOT resistive load like heat stripes. Those relays would turn into hot fudge sundays. Now, the contactor relay would do well. Sir, you handle those probes like Chinese chop sticks, best i have ever seen. Great job, I enjoy the channel.

[@TaddyDigest]

You're awesome great information Charles Thank you

[@joehead1294]

90-340 relays can handle resistance loads as well, you just don't see many in that occupation. They max out at 15 amp.

[@jeffw527]

I to was impressed with the way he handled those probes.

[@waynelindsay327]

I thank you wonderful information, your videos are great

[@salmannawaz5392]

MaaaaaN, you have explain it so well, i have been never able to learn it so well. like the whole wiring system is been explained so well, which always haunted me. keep it up

[@jt.00011]

Brother thank you so much for this demonstration! I'm actually doing this in hvac school right now. You definitely have a teaching gift!

[@TaddyDigest]

Thank you so much, my friend.I'm glad you enjoyed the video

[@herondouglas3369]

Great job daddy Tadd in simplified explanations on various technical topics 😊😊😊

[@TaddyDigest]

Glad you liked it

[@salv638]

Spot on my man!!!! Ive been in the field for 18 years and you explained it perfectly!!

[@stuartewoldt1513]

Bravo Man, you did this in such a elementary way almost anyone could understand.

[@TaddyDigest]

Excellent Thank You

[@dannyrichardson9247]

It's so great to watch the guru of hvac. Straight to the point and broke down in crayon for me to understand. Love it..

[@homes1001]

I really appreciate this video. Not just for the knowledge on application, but for explaining the components. Going to watch this a few times to try and get it set in my head.

[@TaddyDigest]

Very cool thank you so much for watching. Please put it on auto play that way it helps me.

[@joshfranklin7513]

I just started HVAC and this video was very helpful with understanding with visual representation. Pls keep the informative vlogs on the tube

[@TaddyDigest]

I got your brother thank you so much for watching

[@jasvijasvi]

Thanks!

[@TaddyDigest]

Thanks for watching please share the video

[@ricardoalvarez1658]

Thanks for all your videos are very helpful god bless you

[@Alex-jo2oi]

Watching this video with some field experience and some foundational knowledge helps a lot. It all clicks and makes very much sense. Thank you Taddy I’ve come a long way bro.

[@TaddyDigest]

Great to hear!

[@mauroaparicio1855]

very good information thank you for sharing

[@TaddyDigest]

You're welcome thank you so much for watching

[@dlowe204]

I've had to learn basic controls for the plumbing course I'm taking, nothing really makes sense. This video was explained very well and simplified for beginners like myself. Thanks!

[@TaddyDigest]

Glad it helped!

[@yessur8509]

Nice !!! Just joined an HVAC company and this helps !! 💯💯💯💯👍🏽🔥🔥🔥 love your content 🔥💯

Maaaannnn its Feb.2024!!! I just found ur channel. Ur awesome!!. this has cleared up some many issues, that I had. Thank you much. Could you explain what "Common" really is, please?. Especially on the low voltage circuitry. It is still an issue on how it works. Thnx again.

[@TheMaster5150]

I completely understand both relays on how the 24 volts changes each pole from open to close. The only problem I'm having is that you didn't discuss the wiring on the connectors and their purpose. For instance, on pole 1,2, and 3, are they all hot wires? Why would you need power to 2, then shut it down and send power to 3?

[@TheRicardo7500]

Thanks Taddy, the more I watch this video, the more I get the concept of how relays work and how to combine them.

[@TaddyDigest]

Excellent!

[@oscar3181]

You are very good at explaining how things work 😀 thank you

[@DanielDotson-b7h]

Awesome class great teaching skills enjoyed thanks for your time

[@johncantrell614]

Just me, I have been a marine electrician for 34 years. When you put the female connector into the sta-con tool, you had it with the tooth over the seam of the connector. But when you crimp them this way, the two halves with the seam will spread apart because of the tooth on the tool, not giving you the best crimp possible. We were always taught to do it with the tooth on the other side of the connector, so the tooth would push up and into the connector, and the part with the wire and the seam will push up and form around the wire, giving a tight crimp. Nit picking, I know, but inspectors in our field anyway would hit these connections if crimped with the tooth on the seam, and you would have to cut it off and do it the other way. But a very informative video in any case.👍

[@carlosbarcelo2010]

Thanks for the refreshing course ☺️ 😊

[@TaddyDigest]

you're welcome, Carlos 🙏

[@honey____world5724]

This video is one of the best I’ve seen yet, very easy to understand.

[@TaddyDigest]

Awesome thank you so much for watching Please share and hit the like button

[@davidaustin9009]

Hey Tadd..thank you for how patient you are when you share your knowledge..you should be a professor..ua techs really appreciate the simple and yet soo informative videos...auperthanks bro...

[@TaddyDigest]

You're welcome my brother. Thank you so much for watching and thank you for your compliments because of you. I keep going.

[@urielgarciaramirez208]

You basically set me up for a good mark in my next lab exam. Thank you so much!

[@TaddyDigest]

Glad I could help!

[@mgm1018]

With winter approaching I’m finally getting to installing my basement smart thermostat that has line voltage inputs. It was at the bottom of my list since my heat only system is not needed in the summer here. Do you have any recommendations for what brand/model relay to use for controlling the HV switched boiler heat with the smart thermostat? I already have the boiler transformer I’m tapping and ran the LV lines to power the smart thermostats, so I don’t need a transformer/relay, just a regular one. Much appreciated. I feel as though the knowledge and confidence I acquired months ago has faded from my mind 😅

[@taketinnn33]

Wish I had found this channel earlier. You have great teaching methods. Thanks Tad

[@TaddyDigest]

Happy to help!

[@jollyscaria1922]

Normly opn nrmly closed rey contacted 24v one cotacted comen c th..cotacted ctancted one side contacted one side contacte rely contectedo engizing outer power fan out comeing rely and

[@jhernellmusic]

Excellent. I just found your vlogs. Incredible teaching! I am using these to train my HS boy to test units so he can help me with my HVACR business! This is worth gold, buddy! Thank you so much and I admire your teaching!

[@TaddyDigest]

You're welcome thank you so much for watching my friend

[@jillfoster6766]

Hi Tad, I have an electric ac/furnace unit. It has a safety alert to tell me when there's water in the bottom pan. My thermostat went bad. I changed it and blew a fuse, I fixed that. So now I have my thermostat on nothing runs. I wire my Yello, green & ref low voltage wires all together. I can then run my ac & blower, but the blower won't shut off. Do you know any reason the safety alert might have something to do with the fan always on?? OMG, I'm on my fourth day of trouble shooting, and it was 90 today😢 unemployed until next month, so here I am on KZbin University. I've now watched all of your videos. Thank you for them!

[@heatingairservices8708]

Great HVAC Tech Tips ..Thanks Tad

[@TaddyDigest]

Thank you for watching my friend

[@tptm100]

Thank You! I have been looking for a great video on this topic for a long time. Knowing about something is one thing but being able to explain it in easy terms is what we need more of. 10 out of 10 rating.

[@TaddyDigest]

Awesome Tom thank you so much you rock

[@andresbravo6447]

I agree awesome video!

[@TaddyDigest]

Thank you so much Please let me know what video ideas I can do in the future they would bring really good value Check out my members only videos Please do not forget to hit the notification bell hit the link button and share my content

[@threeleft16890]

Great video

[@TaddyDigest]

Thank you really appreciate you watching the video Hit the like button

[@IXArcanine]

Man this video was awesome. It's got known knowns, known unknowns and unknown unknowns. Stuff I know I know, stuff I know I didn't know and stuff I didn't know I didn't know. Very helpful.

[@TaddyDigest]

Right on!

[@dereksosa5801]

Awesome video I'm usually doing construction and recently moved over to the service side and this helped me out so much thank you and keep posting videos like this very much appreciated

[@TaddyDigest]

Great to hear!

[@txmade72]

You did a great job simplifying the details 👏🏿 👍🏿

[@TaddyDigest]

Thank you 😊 Glad you watched 👀 😊

[@baldguyadventure]

Thank you for the video! My blower had quit working and i thought the start cap was bad so I replaced it but the problem persisted. The compressor was running but there was no air moving. I spent a couple hours in the crawl space at the unit (old Trane XE 1100 with gas - Pulse unit) and every time I tried to run the fan I heard this humming. So I tapped the fan relay enclosure and it kicked on! My local supply place had a tp-90340 for 13 bucks that replaced the very old p-8-10283.

[@TaddyDigest]

Awesome so glad they had the part Thank you for watching

[@james77011]

very good video 😃

[@TaddyDigest]

Thank you! 😃

[@DavidDiaz-ij9uc]

Great explanation, informational video.

[@TaddyDigest]

Glad you enjoyed it!

[@TaddyDigest]

please share the video

[@joelgonzalez5462]

Hi Taddy all video's you are have are awesome 👌 👏 👍

[@TaddyDigest]

Thank you Joe stay tuned there's more to come

[@joelgonzalez5462]

Of course I will, see other guys, are good too , but yours are more goods !

[@Strictly4Defense]

Dude.. you rock! Everything on this video I finally understand after all these years I had somewhat an understanding. But this was clear refresher. Thank you.

[@TaddyDigest]

Rock on!

[@canik9mm]

Thanks for the video as a rookie in the field you made it simple. Thanks

[@TaddyDigest]

your welcome Glad you watched 👀 😊

[@1975coronel]

Thanks for your patience and beautiful information definitely I learned thanks you blessings

[@TaddyDigest]

You're welcome awesome I'm so glad that you learned it makes the video worth doing

[@eltechnico]

excellent video my friend keep it up 💪

[@meangreen2792]

Outstanding video. Nice layout. Can you explain more on how contractor, capacitor and pressure switches on refrigerant lines work. How they are tied into each other?

[@TaddyDigest]

Yes definitely

[@carloscouret5144]

Great teacher

[@TaddyDigest]

Thank you brother

[@dgmenace73]

Thanks for the video. I've been troubleshooting a Hallmark horizontal oil fired furnace. I'm having an issue with it going into a lockout. Sometimes it will work for a couple days, others just a few hours. Order of replaced parts are...oil Filter, pump screen/strainer, nozzle, electrodes (adusted properly), and cad sensor have all been replaced in the last 2wks. I added a pressure gauge to the pump and its reading 140psi...single oil line, above ground, gravity oil tank. This is an older pump, no shutoff solenoid. The flame looks great & the limit switch seems to be operating properly. The ignition transformer throws an arc at least an inch. No smoke or soot. Have you ever run into an intermittent problem like this that was the transformer or fan relay? Any suggestions would GREATLY be appreciated. Once I press the red reset button the furnace fires right up and I can never get it to act up while watching it. Thanks in advance.

[@txmade72]

Very informative video 👌🏿

[@TaddyDigest]

thank you 😊 my brother share the video when you can

[@plyrchris15]

Good video bro … learning more how to troubleshoot,,,,,, i have a question tho Why some thermostats dont have the common wire hooked up on the actual thermostats?

[@TaddyDigest]

Some thermostats don't have a common because they have batteries

[@miguelrojas3394]

Thanks Taddy great explanation your the best.🙏🙏

[@Almtyhalfbreed]

Do you have budget friendly must have tools for beginning HVAC techs?

[@TalentNetworked]

Thanks for detailed training.

[@TaddyDigest]

your welcome Glad you like it 😀

[@lukehall1790]

Feel like imma have to watch this a few times lol

[@TaddyDigest]

Hope you like it Please share if it helps you

[@jollyscaria1922]

24v volt coroled realy snd normaly oon and closed realg crolhvac systom selftey thefmostsnand corold ealy snd eizing cotntacted and owefpoter srlft hc systo uding fancspiter starting usingfsnone side in .oug engzing sstm working

[@stansummers6259]

Great video from Cadiz Kentucky

[@TaddyDigest]

Awesome thank you for watching stan

[@theprofessor5584]

Great hvac video

[@RC-Heli835]

Thanks for sharing this man. I did not know that these relays function with normally closed and normally open switches. I'm pretty positive that I have a bad relay right now not letting 24 v get to one terminal of the honeywell S86F igniter.on my furnace.

[@migueldominguez4311]

Great great information 👍

[@TaddyDigest]

Glad you liked it

[@connorcoutant2059]

Thanks man for the info! Go to these lengths and to teach and help me understand better

[@TaddyDigest]

Glad you enjoyed the video please share if you can

[@rubenibarra1874]

Question I have a Jard 17325, How can you tell which side is the Load or Power. Their no label on either side?

[@tylerluu5670]

I love your videos. I watch it over & over until it burns my brain. Question: I am working on Carrier HVAC which is 25 years old. I replaced the transformer and I checked all the wires. I got all the power but My Control Board has no red light. Any suggestions I appreciate it.

[@TaddyDigest]

check for 24 volts and then yes replace board

[@michaelwiltgen5208]

This made things much easier to understand ill be watching the rest of these hvac related videos for sure

[@TaddyDigest]

Very Good Thank you 😊 Glad you watched please let me know if you have questions Check out my members only playlist It's nice

[@Freeze4545]

This video helped me a lot, thanks. New to the field, going to night HVAC classes at community college and working for commercial company

[@TaddyDigest]

Awesome I love it Thank you for watching 👀 😀

[@jessemendez647]

Great video Tad! Keep up with the great work.

[@TaddyDigest]

Thanks a ton!

[@juanvasquez7148]

just thank you so much for your time making this video God bless you.

[@TaddyDigest]

You are so welcome

[@tjeskew3891]

Im just now really getting these issues and this video is so freakin helpful. Thanks so much man. This is awesome!!!

[@TaddyDigest]

Glad it helped!

[@guillermo5812]

you are a perfect teacher

[@TaddyDigest]

Thank You

[@BenBen-mw2nz]

Good job

[@ballkickers7142]

very good explanation . very helpful it really helps a lot

[@HsingSun]

Thank you for your video. Question 1: My cooling system keeps running, non-stop, what should I look into the problem? Question 2: Is a Sequencer only work as heating systems?

[@TaddyDigest]

When a sequencer goes bad it can cause the Indoor fan to run all the time Sequencers are most commonly found in trailer units If your compressor and outdoor fan are running you likely have a contactor issue You're welcome thank you for watching the video

[@boblevey]

That was a great watch!!! Not a AC Tech but a DIY’er Thanks

[@mannysoad]

Dude this helps so much I’m still learning but this was explained well and not to much information just the essentials

[@TaddyDigest]

Glad it was helpful!

[@brandonneims9397]

How do you know what side to put your common to on the relay is it just the opposite side of the calling wire I know this is a old video but I would love to get relays down

[@vikingpapi]

This video taught me SO much. Thank you, sir.

[@TaddyDigest]

So glad to hear my friend Here's my email make sure that you email me. I have a guide I can send you.

[@TaddyDigest]

[e-mail]

[@tercyalexanderdiaz5157]

GREAT VIDEO

[@TaddyDigest]

Thanks Tercy

[@franciscotejeda1461]

Excelent video n Happy New Years n God Blesssing

[@TaddyDigest]

Happy new year

[@principeazteca2000]

Thanks Taddy...you are my hero👍👍👍👍

[@TaddyDigest]

Wow, thanks

[@ryandunlap2096]

Fantastic video. Very informative. Thank you for taking the time to do this!

[@TaddyDigest]

You're welcome thank you for watching please hit the like button And don't forget to hit the bell

[@Ray-wr2wr]

is the common wire on the air handler board always energized 24v ? coming from transformer C wire usually closed contacts on the condenser relay , just left a job site ,jump R to Y & O terminals on the heat pump condenser so people can have acold air) im in NYC & we have a heatwave ( solenoid valve was making buzzing sound i check the voltage 27v not sure what is the issue here going back to the job site tomorrow it was a late call . any advice appreciate it

[@TaddyDigest]

it is not uncommon for a solenoid coil to buzz c to r always have 24 volt

[@kizito8888]

Thank you for the video.

[@TaddyDigest]

You're welcome thank you for watching. Please share the video when you can

[@kizito8888]

@@TaddyDigest Will do.

[@motif5775]

Very informative video, thank you! Subscribed!

[@TaddyDigest]

Awesome, thank you!

[@joebanks174]

A bl wire and a wh wire go to the motor. Would you say one is power,and the other is completing the circuit? Did the Amp draw difference tell which is which?

[@TaddyDigest]

I'm not sure. It's been a long time since i've watched this video

[@albertobarrameda6128]

Thank u Sir, very useful to me💪

[@brunomelvin4233]

Very informative. You have done a good 👍 job for us to learn. Thanks a lot.

[@TaddyDigest]

awesome Thank you for watching

[@rozilla_the_savage4445]

New to the field. Got a package unit that was freezing up. Noticed the blower doesn't come on when i call for fan, but the compressor and condenser fan comes on when I call for cool. Possibly the fan relay?

[@stephonthomas4306]

lol felt like you was explaining colors and shapes to a child....and i understood everything lol thanks

[@TaddyDigest]

hahaha 😂 😂 😂 😂

[@TheDarkEmpireftw]

Thanks for making this i just started in the trade the controls is messing me up this is a lot of help thanks for taking the time to make this

[@TaddyDigest]

Awesome Glad this helps please help me by sharing and liking 👍

[@dfu1685]

Just wanted to say thank you so much for showing the whole Gestalt of how this works. Well done! Helped me HUGE.

[@TaddyDigest]

Glad it helped!

[@fubartotale3389]

Got a new central A/C unit installed and the relay buzzes loudly when engaging. One guy said it's normal but it didn't do it before. Will a soft start unit elininate this?

[@TaddyDigest]

It may help to eliminate this but i'm not sure because you could have another issue

[@oscarcontreras4315]

God is blessing you, thank you

[@TaddyDigest]

Thank you my brother May God-bless you