HVAC Training Board: How To Troubleshoot A Transformer (How To Check A HVAC Step Down Transformer)

HVAC Training Board: How To Troubleshoot A Transformer (How To Check A HVAC Step Down Transformer)
How To Test A HVAC Step Down Transformer
Electrical Transformer Testing
How To Check A Transformer With A Multimeter
How to test/check a hvac transformer?
How to test/check a step down transformer?
How to test/check a isolation transformer?
HVAC transformer testing/troubleshooting
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What is a transformer & how does it work? HVAC/R
• HVAC/R: What is a tran...
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How a Transformer Works:
Michael Faraday, the 19th century British physicist, made transformers possible when he discovered the phenomenon of magnetic induction. To make a long story short, a transformer uses induction to alter the voltage in an AC circuit, and it can either raise it (step it up) or lower it (step it down). An HVAC transformer is a step-down transformer that uses - as all transformers do - a pair of conducting coils wrapped around a metal core.
The primary coil receives the incoming signal, and as electricity passes through it, it induces a magnetic field in the core. That field energizes the secondary, or output, core, which in turn induces an electromotive force in the output coil. The EMF is directly proportional to the number of windings in the coil, so if the coils have different numbers of windings, the voltage in each circuit will be different. This only works with AC current because the electricity has to be in flux to induce a magnetic field.
The Control Circuit Is Isolated:
The electric signal from the transformer is used by the system to open and close a series of relays and contacts that control the various system functions. The way it operates a particular component, such as the blower motor, is something like this:
The neutral leg of the 24-volt circuit that originates at the transformer is connected to one terminal of a control relay that consists of a coil and a dry-contact switch. The hot leg is fed through the thermostat before connecting to the other relay terminal. When the thermostat switch closes and allows power to flow, it energizes the coil in the relay, which generates a magnetic field that closes the switch. The blower, which is powered by an independent 120- or 240-volt circuit, comes on.
Signs of a Bad Transformer:
As a passive electrical device, it's rare for a transformer to malfunction, and a certain amount of humming is normal. A transformer can malfunction, however, if there is a power surge large enough to damage the coils or wire contacts. When the transformer is damaged, the circuit breaker controlling the system will usually trip to prevent damage to any of the sensitive electronic components of the control system. The breaker can trip for a number of other reasons, and it usually takes an HVAC professional to trace the cause to a bad transformer.
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[@manonfire3642]

This channel is invaluable. Thanks for sharing.

[@JumpermanTech]

Thank you! I appreciate you watching & your feedback 🙏 Stay tuned for new videos every week! 🔧

[@danielkarbon]

This video was perfect. The problem ended up being a bad Transformer. 120v coming in but no 24v going out. All the instructions and tips were spot on...thank you

[@nicholasflores8783]

This week I diagnosed a bad control board because I saw no LED light on the board.This york package unit had a transformer just like the one in this video, and I did not know how to test because I rarely see them and because of my lack of knowledge I didnt test. I more experienced tech went out after me and did all that you just did and the transformer had no 24V coming out which powers the board. Man, I feel so dumb. This video will save me!

[@odd-]

Thank you sir. You just saved me 13K on a new system the HVAC guy was trying to tell me I needed. Replace the transformer, and everything is now working perfectly. Cost $27.

[@TheTruthSeeker756]

Man that’s SCARY!

[@Viewsandvibrations]

Whered you get a transformer for 27$ lol

[@fse9449]

Just what I needed! Needed to replace the transformer and was not sure if the 24V output was DC or VAC. Seeing your meter set to AC cleared that up for me. Now I feel confident I am ordering the correct after market transformer. Thank you!

[@arayahailu8762]

Brother , believe me you could make your self the best instructor if you open your own school. I had few old school instructors/ hvac gurus explain to me about transformer, yours by far is the best . Because you explained everything A-Z

[@TalentNetworked]

Very good lesson. Talk at the speed or us to learn, unlike the other fast talker trainers. Thanks

[@carlosboudet8441]

Very grateful for your excellent video. Last night we spent a very warm night at the Florida keys because our A/C would not turn on. I spent several hours last night trying to find the problem. This morning I watched your video and was able to find the control board with a blown fuse hidden under a couple of steel covers inside the air handler and fixed the problem. I had called several air conditioning companies and the soonest I could get one to come was tomorrow. Thank you again.

[@TheTruthSeeker756]

Man that’s good troubleshooting!

[@ytnax]

Brilliant! This is simply the best video on testing the transformer I have seen, period. I have also found that replacing the contactor is quite common and wise to replace both when the contactor is bad, which I guess many times will fry the transformer? Again, you made it super easy! Thanks bro.

[@alexanderboyd2280]

This was the easiest explanation of this concept that i can find. Thank you so much!

[@JumpermanTech]

You're very welcome & thank you! Stay tuned for new videos every week🔧⚡️

[@JamSetMusicGroup]

Thank you, you did a great job explaining. Very clear and understandable. It helped me a lot.

[@LamboBoy8649]

Really appreciate this video. You’ve been a big help since I joined the industry a couple months ago

[@JumpermanTech]

Thank you! I'm glad my videos help! Appreciate your feedback 🙏 Stay tuned for new videos every week! 🔧

[@rashidatif4688]

Good day bud. What a beautiful and God gifted teacher you are. Everything you said crystal clear.All the best

[@joeydianza840]

Man, such an informative video. I'm just a regular Joe that likes to fix my own hvac, and this was extremely helpful. I wonder how much money I have wasted on throwing away good transformers.

[@almontes9846]

Thanks a million. I just fixed my 38 year old a/c unit. Thanks to your videos. I'm not sure how much money you saved me(28 dollar part) but I don't care I wasn't going to pay it. Loool. Thanks!!!!!!!

[@user-ij1nv8be3i]

I could kiss you ! Finally a teacher on youtube who takes into consideration how our brain processes information. Thank you so much for shining your light and sharing knowledge with us.

[@buckyoufiden2187]

Very helpful. I watched both of your hvac transformer videos before sucessfully replacing mine. All your videos are so helpful. Thanks again.

[@dancroteau6892]

Great explanation!! Thoroughly enjoyed that as it was so well explained. Very much appreciated

[@Lam777]

Thank God that I encountered to you this platform , you are a genius .

[@lg3053]

Super great video. Very detailed and finally someone explained in detail what the numbers mean on the transformer.

[@alexsilyaev1593]

you are real teacher-very easy to understand for everyone!tnx!

[@wondermike8877]

Great video. Easily explained. Thank you.

[@herbertgreen2788]

10 minutes of video I learned a lot on the transformer the way you explained it was very comprehensive that was a excellent

[@anthony90491]

Loving these weekly vids 💪🏼

[@JumpermanTech]

Awesome! Glad you do 🙏 Stay tuned for new vids & be safe out there 🔧⚡

[@jbdelta4542]

solid, straight forward and accurate, easy to understand info deserves a like and comment.. plus ya got the today was a good day song.. cheers

[@alishatruman]

WOW, this is so fun! Really helps break everything down easily. Thank you!

[@triggerMB]

Thank you so much for this video. After watching,I was quickly able to replace transformer ($15), get heat pump working again, saved $ by avoiding a service call charge.

[@jeanifaust8815]

Informative, safety measures clear, clear explanation

[@MrUnix-cu9yy]

Thank you for your videos. They really help lots.

[@richiemaraj]

Excellent, very interesting for me as a young tec. Thank you.

[@sawhorse9820]

Very well done...Excellent!

[@izzybell11]

Interesting and helpful video. Well explained and excellent presentation . JMT thanks for sharing with us this valuable info.

[@JumpermanTech]

Thank you very much! I appreciate the support 🙏 Stay tuned for new videos every week! 🔧

[@zekenzy6486]

Great Video. This is exactly what I need. Thank you for sharing

[@strayhound61]

Great job on the explanation and the demo board! Very helpful.

[@brucebig]

Great video. I feel like an expert after listening. He really explains it all so well. Thank you

[@gwarlow]

Very well explained - thank you!

[@dannymoreno03]

Excelente video 💯 great teacher

[@fixingandmore4776]

Thank you very much for this helpful video.

[@tonyv6216]

Great video. Excellent explanation.

[@LeahHerrera-uo8wz]

Great teacher, thank you!!!!!

[@abrahamchiapas3548]

Thanks teacher ..I fill more confident on my next transformer test on the next work order I will get I'm maintenance and I will use this info..thanks..

[@tullyriverquail]

Making a diy incubator. Next I'm going to look for your entire training board explained. Thank you

[@JumpermanTech]

Sounds very interesting. You're very welcome & thank you! Stay tuned for new videos every week🔧⚡️

[@peterv2306]

Thanks for a great explanation.

[@robertdavenport9095]

Great explanation and easy to understand

[@JumpermanTech]

Thank you man! The training board videos are some of my personal favorites. Appreciate you watching & the feedback 🔧⚡️

[@angelaguirre9453]

Great video my guy 👏🏽👏🏽

[@jameskennett8666]

Great video and explanation

[@cogie23]

Thank you, Great explanation

[@dido1803]

Wow!!! I love the way you explain this. I learned a lot watching this video. You explained very clearly, and easily to understand. I will continue to follow your channel.

[@tonygonzalez3256]

That was a great explanation.

[@carlosemmanuelgarciabrito791]

That's was awesome nice and neat I like the way you take your time to explain things

[@JumpermanTech]

Thank you! Glad you enjoyed the video. Stay tuned for new videos every week 🔧⚡

[@hermancoetser1869]

THANK YOU, love the knowledge. Keep it up, we will build it up

[@JumpermanTech]

You're very welcome & thank you! Stay tuned for new videos every week🔧⚡️

[@johnjohnson7578]

Great training video!!

[@JumpermanTech]

Thank you! Stay tuned for new videos every week🔧⚡️

[@GUILLERMOJGARZON]

Nice video, very well explained. You have now one more subscriber.

[@neilvu8650]

Very good technical video. Thanks

[@JGR088]

Great advice, and video . Thanks..

[@daviddowner5095]

Awesome video bro thanks

[@delta3garcia]

Excellent video!! Thank you.

[@JumpermanTech]

You're very welcome & thank you! Stay tuned for new videos every week🔧⚡️

[@dr_flunks]

excellent narration.

[@francisdsa6790]

Very good explanation and demonstration appreciate you Great 👍👍💐

[@JumpermanTech]

Thank you very much! Stay tuned for new videos every week🔧⚡️

[@mattsuttoni4003]

Dude. Excellent content.

[@JumpermanTech]

Thank you very much Matt! Stay tuned for new videos every week🔧⚡️

[@carlosdclaveria819]

great video, thanks

[@cookiecrook37]

Great explanation

[@seadub1630]

Thank you Jumper man.

[@jayl1052]

Great video. Appreciate the info.

[@JumpermanTech]

Thank you! I appreciate the feedback 🙏 Stay tuned for new videos every week🔧⚡️

[@SouthpawAutoworks]

Love it! Thank you.

[@josselindesir5409]

Thank you so much for sharing this

[@before120]

thanks man ...very thorough

[@JumpermanTech]

You're very welcome & thanks for watching! Stay tuned for new videos every week 🔧⚡️

[@gjkMN]

Great stuff, thank you.

[@sajidhussain5909]

Thanks sir ...i learned a lot from you

[@carlosmunoz-gn8ls]

Very helpful

[@enrolledregistrar103]

Very helpful thank you

[@user-hk4ee8bc5h]

Thanks , nice presentation , thanks for sharing

[@mansurniazz]

Great video for beginners. I check voltage at transformer

[@bahramkhan9507]

Thanks great explanation

[@3rkowtf669]

Great video, in my case my primary incoming power is 120 V for some reason, it is a transformer with 240v primary and 24v secondary set up, after replacing few breakers at the fuse box with the new ones now I’m getting only 120v input between Com and 240v lead and obviously 0v at the secondary wires, I replaced The transformer with the new one but no change, still getting only 120v, it looks like I got to check the fuse box, any advice what should I look for? Thank you.

[@user-tr9to2bh6x]

Thank you for your Video practical important 👏

[@daykon1834]

Very good video !

[@teklefitsum]

Wooow amazing brother.

[@devinclark8689]

Common knowledge but! Well done thanks man.

[@diegomendez4877]

thank you, very appreciated!

[@mikewood6287]

Great video! Question: my inline fuse from the transformer (blue wire) is blown. The secondary was not producing 24v, so I put a known good transformer in and it blew the fuse again. Could my board have a short in it that is causing this issue?

[@tazlo9657]

Thank you sir!

[@mannyloera4297]

Awesome video 👏🏼.

[@JumpermanTech]

Thank you! Stay tuned for new videos every week🔧⚡️

[@diorcarter7236]

Thanks I love it

[@lindengauthier4407]

Very helpful video, thanks for posting. Im troubleshooting my reznor garage heater. It turns on runs a few cycles fine then when i come in the morning i can tell it hasn’t ran all night. Trying to figure out if its the transformer or if the circuit board is bad

[@arthc.castillo8982]

Thanks to you, I'm learning a lot. Hello from Mexico

[@deesc0187]

Much appreciated

[@birdsandhumanslifes7967]

Thank you for sharing

[@shelby50411]

Hi jumpingjack...whst could cause a gas furnace 24vac transformer to catch fire / melt on the 110v side ?

[@gotchaplumber]

Good info.

[@mydeserthvac]

I like the flow🎉

[@JumpermanTech]

Thank you! Stay tuned for new videos every week🔧⚡️

[@carvajal01]

Thanks this helped me, I got old carrier package....

[@520Savage520]

Thank you👍🏾

[@user-ic1tf9eg7h]

Clear cut awesome please make a video about PAC and Tr calculation

[@joereading1321]

Very good

[@Kocoea1]

Great video, but you didn’t say which 24 volt wire is hot and which one is common

[@bobflyer4346]

Another simple test is to feel with you hand if the transformer is warm. If Warm most likely all is good but may still have issues, get out the voltmeter and double check.

[@igorshapovalov8527]

Thank you

[@boniji5806]

Beautiful bro

[@RC-Heli835]

Hi Jumper Man! Do you chassis ground the 24 v side of the transformer on one lead?