Which HVAC 24v Transformer can you use for Replacement on almost Every Unit! Transformers

Рет қаралды 348,813

8 жыл бұрын

This is how to wire a multi-tap transformer, how transformers work, and what the colors mean when connecting to HVAC systems. This transformer is important to have in your service truck because it will work with 208, 240, or 120 volts to create the 24-volt control voltage. Supervision is needed by a licensed HVACR Tech while performing tasks as Experience and Apprenticeship garners Wisdom and Safety.
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@acservicetechchannel 7 жыл бұрын

Our Inverter Mini Split Resources: Mini Split Book on Our Website- www.acservicetech.com/mini-split-book Mini Split Paperback on Amazon- amzn.to/3ytHJSs Mini Split Paperback on TruTech Tools- www.trutechtools.com/BooksGuides?aff=8 Mini Split E-Book on Google- play.google.com/store/books/details?id=HN-iEAAAQBAJ Mini Split E-Book on Apple- books.apple.com/us/book/id6445178399 Our Single Speed and Two Speed Air Conditioning Resources: My Paperback and E-Book: www.acservicetech.com/the-book My Paperback: www.amazon.com/shop/acservicetech Read the book reviews on Amazon! Check out our new Articles at www.acservicetech.com/articles Support the Channel by purchasing tools through Tru Tech Tools! Use this link www.trutechtools.com/?Aff=8 Save 8% at checkout using code "acservicetech" Tool List- www.amazon.com/shop/acservicetech Support- www.patreon.com/acservicetech For those that are looking for the tools used in the videos: (Linked Below) Here is a link to the transformer used in the video- amzn.to/2d77MXY Here is the Link for the newer UEI DL479 Multimeter with temp sensor- amzn.to/2jtsUbJ Here is the Link for the newer UEI DL469 Multimeter- amzn.to/2jw4ePJ Here is the Link for the UEI DL389 Multimeter used in the video - amzn.to/2naJr9o Here is the link to the Fieldpiece SDMN6 Dual Pressure Testing Manometer with Pump-amzn.to/2jyK5Ka Here is a link for the Supco Magnet Jumpers amzn.to/2gS4h6z Here is the link for the Irwin Wire Stripper/Cutter/Crimper amzn.to/2dGTj2V Other tool links can be found in the video description section. ACSERVICETECH is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.

@acservicetechchannel 8 жыл бұрын

Thank you very much for your comments, they are appreciated

@sirmixalot135678 8 жыл бұрын

very good video... simple cut and dry and right to the point

@stupidhurts04 7 ай бұрын

This was very helpful for me to troubleshoot and confirm that I had wired a new, but faulty transformer correctly. Thank you very much for the simplification and straightforward tutorial!

@dckid571 7 жыл бұрын

I love your videos, theyre short and very informative!

@acservicetechchannel 7 жыл бұрын

Thanks Salvador Toloza!

@st.charlesstreet9876 Жыл бұрын

Again clear instructions with demo on this field, Thank You!

@Mowers11 7 жыл бұрын

I added a 3a fuse to my power supply (40VA) and attached two spade terminals to the hot wire of the 24v side. Works great now I feel that I protected my board better. Older system, 1999 no fuses!! THANKS Great vids by the way.

@acservicetechchannel 7 жыл бұрын

That's great to hear, yeah add that protection in. Good idea!

@gspa072 4 жыл бұрын

Great explanation. Thank you bro.

@glennphillips7757 3 жыл бұрын

Exactly what I needed to know. Thanks!

@acservicetechchannel 3 жыл бұрын

Glad it was helpful!

@dpolendo 6 жыл бұрын

Thank you for the information. Very useful

@acservicetechchannel 6 жыл бұрын

Thanks Daniel!

@jimbossemi-customs3129 3 жыл бұрын

Very informative. Thank you!

@acservicetechchannel 3 жыл бұрын

Glad it was helpful!

@whitesheatingairappliancer7101 7 жыл бұрын

Thank you for the videos

@acservicetechchannel 7 жыл бұрын

Thanks Ron!

@earthisheart6797 4 жыл бұрын

Thanks again Craig. You the man.

@acservicetechchannel 4 жыл бұрын

Glad to help, thanks!

@jimbola77 8 жыл бұрын

sweet job!!!

@obrianthinline8514 3 жыл бұрын

Wow it’s amazing how much I learn in such a short vid. I’m about to replace a broken transformer in my air handler. This give me the knowledge and confidence. Thanks!

@acservicetechchannel 3 жыл бұрын

You can do it!

@gibby9280 3 жыл бұрын

So did you burn another one?

@obrianthinline8514 3 жыл бұрын

@@gibby9280 oh yes I did get one on eBay ($20) and replaced it in 15 mins. Piece of cake😊

@gibby9280 3 жыл бұрын

@@obrianthinline8514 changed mine burnt it too. Learned to put a 3amp fuse. Changed sequencer,coil relay, limit switches. After several blown fuses found it was my thermostat!!

@JM-gx7iv 2 жыл бұрын

I know I'm late, but you should just leave these things for us technicians.

@patrickpeterman8736 7 ай бұрын

VERY HELPFUL !! THANK YOU, PJP

@kylemalachi9279 Жыл бұрын

Hey I learned something! Thanks man

@AntonioClaudioMichael 4 жыл бұрын

Very informative thank you for the information so very much you rock

@acservicetechchannel 4 жыл бұрын

So nice of you

@californianor5450 7 жыл бұрын

thanks help a ton, nice vid.

@acservicetechchannel 7 жыл бұрын

Glad to help, thanks for your comment!

@deepbludude4697 7 жыл бұрын

excellent upload!

@acservicetechchannel 7 жыл бұрын

Thanks Deepblu dude!

@PBS-nm1uu 6 жыл бұрын

great video please do more

@acservicetechchannel 6 жыл бұрын

Thanks PBS #007!

@seshachary5580 4 ай бұрын

very educative. thank you regards

@wisdomwisdom817 Ай бұрын

Awesome job thank you so much

@jfarinacci0329 2 жыл бұрын

good vid. thank you

@lawrencecarlson2425 4 ай бұрын

Thank you

@javielitot 9 ай бұрын

god bless you my friend💪🏽

@jfarinacci0329 3 жыл бұрын

thank you.

@stephentackett2905 5 жыл бұрын

The green wire that you mentioned being the common on the 24 volt side, Can I hook my Blue wire to the c terminal on my wi-fi thermostat? Thanks.

@dapperdon7212 5 жыл бұрын

Can you do a video SHOWING how to wire a transformer exactly. Like breaking a leg off high voltage etc? Your videos help me in my hvac career & I had a hard time wiring a aprilaire ventilator yesterday when it came to wiring the damper motor to the transformer. Thanks brotha

@acservicetechchannel 5 жыл бұрын

Dapper Don, thanks for letting me know what you would like to see!

@hiseminencetheholymacdiarmada 2 жыл бұрын

I live in Savannah GA and my transformer died… I know!!! There are a few places I could get a new but it was after hours and they were all closed. So on a whim, I checked continuity on the primary winding between C and 230 and got nothing, however there WAS continuity between C and 208. You see where I’m going with this? I put the transformer back in the air handler, reconnected the low side and connect the high side to the C - 208 tabs. Turned on the juice, no smoke, all is good. As of the time that I am typing this, it’s been running for about 3 hours (it got up to 79 inside). Everything opens up around 7am, hopefully we make it!

@blackindian9554 Жыл бұрын

Thank u good sir

@mikev3956 10 ай бұрын

Thanks for this video. It was very informative. Can I run two 24v UV lights off one of these transformers?

@TexasEngineer Жыл бұрын

How do you determine what size transformer to use and what size fuse to use? I am trying to add some relays to my system and I cannot find out what their coil power draw is and determine if the transformer will work.

@lukas______ 7 ай бұрын

I have a 120/208v line voltage system with red, black, and ground wires connected (with two red wires behind my current thermostat wire nutted together for whatever reason). Will this work to power a Nest Thermostat properly? Do i still need a C wire aka their Nest Connector?

@Likesubscribable 5 жыл бұрын

I need help.. I have a issue with needing to rewire the train air handler I have.. their is three main wires I have to connect to.. they’re thick gauge main power wires colored red black and green.. I need to know which I have to connect which to to get the blower back to working again.. I have a picture if I need to send it.. I believe it’s 240 .. the transformer is a pf52475 3.2 amp .. the blower is a Trane twv030b14f... Currently the green wire from two wire side is connected to the Grey wire from the unit and the red wire connected to a black and red wire from the unit.. I have red black blue and orange on the other side of the transformer I need to figure out where to connect to.. there is also a small red wire coming from the unit not connected to anything.. Which of the thick black red and green wires do I need to connect to the transformer and which transformer wires do I need to connect to the unit? From the unit I have two small white wires and a red wire same size not connected to anything..and the larger gauge red black and green..

@nickpanhead7209 7 ай бұрын

Hi came across your video, can i use this transformer to step down a 120 volt thermostat on my boiler. Im looking to put in a nest thermostat, and was wondering if this could work for me, so i can get rid of the old 120v and put in a 24 volt wifi enabled nest thermostat. Would you happen to have a wiring diagram for this to be done, on a heat only system with an aquastat relay.

@truckinforever985 7 жыл бұрын

Does the 24 volt coming from the transformer go to the board first or the thermostat

@acservicetechchannel 7 жыл бұрын

To the board then typically status light, then fuse, then safety sensors, then board therm terminals, then thermostat

@johnnylongchord2501 Жыл бұрын

I’m late but would this work on a irrigation 2 wire system and if so what wires would I use and what wire could I put a fuse on the 115v side to prevent overload

@drummerdem50 7 жыл бұрын

Great explanation.

@acservicetechchannel 7 жыл бұрын

Thank you very much!

@truckinforever985 7 жыл бұрын

If I was going to add an inline fuse to the 24 volt transformer side what gauge wire and amp would you recommend

@acservicetechchannel 7 жыл бұрын

Thermostat wire, 18 gauge would be fine, 3 amp would be good. Thanks

@nidgem29 4 жыл бұрын

Hi where does the Neutral wire go? i disconnected a broken transformer with out looking at what i was doing, it seemed pretty straight forward. Now i cant figure out where to connect the white wire. the power entering is 2 phases entering the unit but no Nuetral. What do you think i could do? Thank you in advance for your help.

@Mrjunior714fly 2 жыл бұрын

If I am using the white and black for 120v can I use the red as another 120v motor? If it has a neutral already?

@Mr7352 Жыл бұрын

So if I have 2 120 volt wires no neutral no ground for a 240 volt wall heater in how do I wire transformer to come down to 120 for new 120 wall heaters. I really appreciate your help..

@duffysautoservice9015 3 жыл бұрын

I have a bad transformer, it's a 230 volt but the one they sold me is just like the one you have in your video. Do I wire it as the 240? White and orange?

@westbay5858 3 жыл бұрын

I have 3 wires on my secondary. Hammond part # 166L25 Green , Green/yellow, Green Is the Green/Yellow common? They gave me two secondaries? Could I not have just run an extra wire to a single secondary to run my two items?

@hwesson75 4 жыл бұрын

How hot should one of these transformers get on 120v with no load? I have one this same model that when sitting on a desk with nothing but 120v connected to white/black gets too hot to hold on to after a few hours, and another one of the same type but different brand that I just bought that isn't a whole lot cooler. Thanks. (tmi: Using for project box overkill thermostat builds with a thermostat module and contactor switching an outlet for a window a/c or space heater, because thermostats in those things fail far too often nowadays. I currently have a window unit with a failed digital thermostat that's rewired to always on, and another newish one with a regular thermostat that sometimes needs the knob cranked around a few times before it'll kick off again. And space heaters trend towards completely random on a good day...)

@SombraLocs 6 жыл бұрын

Can you explain how the common on the primary is different from the common of the secondary side. For example on a 480v transformer, they label use black-common and Gray for 480.

@acservicetechchannel 6 жыл бұрын

Electromagnetic induction allows current to pass from one coil of wire to another coil of wire that actually are not touching but wrapped around the same iron core. I would look up electromagnetic induction or how a transformer works, thanks

@cavegame1 5 жыл бұрын

Can you melt tatransformer with feed back?

@l.crossjr 3 жыл бұрын

Nice video. For educacional purposes help me understand this. I have a 120/24v transformer. On the secondary side From terminal labeled 24vac to ground I read 17volts ans From terminal labeled 10VA to ground I read 16Volts. I read 24v across these 24v and 10VA terminals. How do I determine which one of these two wires is the 24V hot? I was expecting to see 0v from one of these legs to ground.

@gerryhan8818 Жыл бұрын

You should pick any one of two as ground, connect it to the ground.

@heatncool 5 жыл бұрын

Brother, fuse goes on common wire that's grouped with high voltage wires ? Do you also put another fuse somewhere on transformer or just there?

@acservicetechchannel 5 жыл бұрын

We put the fuse on the 24v red wire coming out of the transformer. You could use just plastic coated spade connectors and a 3 amp spade fuse. The high voltage side has the disconnect switch outside of the unit and the breaker inside the breaker box to protect to high voltage side, thanks Daniel!

@danielisraelyan768 Жыл бұрын

Thank you for the video. My 35VA transformer on the furnace went bad. Can I replace it with a 40VA transformer?

@acservicetechchannel Жыл бұрын

A 40VA will work because its slightly larger in size

@christianrodgers3213 4 жыл бұрын

When I'm hooking up a uv light and using a separate transformer do I hook the orange and white to the breaker in the air handler?

@loginnitin123 3 жыл бұрын

Hi Christian, were you able to find answer to this question. have you connected the UV light via transformer using orange and white to breaker ?

@wessunde2801 Жыл бұрын

It's considered unsafe to connect more than one wire to each terminal of a breaker. It's better to connect the source wire from the breaker with the load wires to the 2 transformers using wire nuts.. I do see that it's been 2yrs, but still hope this helps.

@glennbulle5080 4 жыл бұрын

I have a question about the 240v hookup Transformer.. you said the rightway to hook up to hook up orange wire one pole that 120v of the 240v and the white wire ..do you hookup the white to the com or the other 120v line please let me know.. thank you.. if you answer that for me.

@Aurelisk Жыл бұрын

Same problem, I have no idea what to do with the white wire

@j727100 Жыл бұрын

@@Aureliskon a 240v circuit (one ground wire two hot wires) you wire the black line wire to orange 240v wire and the white line wire to white com wire.

@mauriceramos 5 жыл бұрын

I have two electric baseboard heaters producing 16 Amps currently connected to a double pole 22A-120/240 Vac(18A-277VAC res. only) thermostat. Can I use this same contactor to connect on a 24V wifi thermostat?

@nestorortiz8868 5 жыл бұрын

am doing the same thing

@texture6 6 жыл бұрын

Would you call it primary and secondary winding. Just like the winding in a compressor Start winding (larger) then the Run winding (smaller).

@acservicetechchannel 6 жыл бұрын

Yes the primary is larger that the secondary, thanks

@frankeckert4901 Жыл бұрын

So for 240. Orange and white both get 120v?

@Bry-mh2bb 10 ай бұрын

I dont get how your getting 240 if your connecting the orange to a 120 line. I have 2, 120 lines on the contactor. (Black, red) I cant hook orange to both at the same time. Do I use the orange on one and black on another? then common?

@jasonshorrock9731 6 жыл бұрын

Can I use a VfB class 2 transformer to run car audio amp and subs in my house? Rather then the computer power supply?

@acservicetechchannel 6 жыл бұрын

You can use a transformer but you are still talking ac voltage and not dc voltage such as 5 dc volts coming from a usb, thanks

@rabinkadariya3250 Ай бұрын

I dont have common on a 240v system,how do i wire it?

@blackopal3138 5 жыл бұрын

omg, smartest presenter.... are you around right now?? lol.... Cz I need u! before I burn down the house or eletrocute myself, lol.... Tuesday, February 12 2019, 12 noon MDST(Alberta)

@james77011 4 жыл бұрын

🤦 i hope u didn't burn your house down...

@juliantrujillo8560 4 жыл бұрын

Mr Craig I have a question,3 months ago I changed a burnt control board since then I can hear what I think is the transformer humming, could this be a signal of any problem, thank you and your videos are number one on hvac teaching keep the good work

@SeaBass-yj2lo 10 ай бұрын

Only time they have ever buzzed for me is when I tied the wrong wire In for common. Like if you put the 120v lead and the 240v lead into the contactor or on the board the transformer buzzes then pops after a few Mins.

@russellperry2303 4 жыл бұрын

I just changed the Transformer on a 240v air handler I'm getting 124v to one leg and 116 V to the other leg of incoming power. But not getting 24v out of the Transformer even after changing the Transformer, would you think the 1 high voltage leg being only 116v would cause the new Transformer to not put out 24v? I tried putting in two different Transformers and still not getting any 24 volts out

@acservicetechchannel 4 жыл бұрын

You may want to contact an electrician or the electric company. Something isn't right. They should match closely.

@gibby9280 3 жыл бұрын

Which wire do you connect the 3 amp fuse to?

@jpintrick84 Жыл бұрын

To your 24 volt power side

@robwolenski5558 Жыл бұрын

The 24 volt wiring

@xz86 7 жыл бұрын

Hello, I have a same part# transformer in my package unit. on the primary side of transformer, is it only 2 wires are used at once? the old transformer that was installed had blk(120) and red(208) connected on 2 poles on the contactor and the wht (com) was cut off, not used. by doing this do you get 240v? the green (com) was grounded to the frame

@acservicetechchannel 7 жыл бұрын

You would use com-white and orange 240 to get 240v. To get 120v you would use com-white and black 120v. Make sure to individually wire nut the other high voltage wires not in use, Thanks

@xz86 7 жыл бұрын

thanks for the reply. I think someone must went into my system and swapped out the transformer with theirs. this unit was installed less then 2 years ago. everything looks new except the transformer, which has some rust on it. there is a label under the contactor say rewire transformer for 208 if 208v is use. that mean white use to go L1 and red goes to L2. thanks for the help.

@acservicetechchannel 7 жыл бұрын

Glad to help. Yes com will be one of the two line voltage wires, thanks.

@jeremyblalack 6 жыл бұрын

I have a bad transformer on a air handler and it only has 2 wires hooked up to the hot side of the low voltage and nothing on the common side. I bought a new transformer that has wires on the low voltage side. what does the common wire go to ?

@acservicetechchannel 6 жыл бұрын

On the low voltage side on the wiring diagram, it may have the 24v common connecting to the ground chassis but you would need to verify by following the wiring diagram, thanks

@atomicorang 2 жыл бұрын

I did this at home

@bsan2550 5 жыл бұрын

On the 24v side the wires are yellow and blue. On the one i have but the one i will replace the colors are like the on you showed

@acservicetechchannel 5 жыл бұрын

Hey B San, the new transformer should come with a wiring diagram to show which one is the 24v power wire and which is the common, thanks

@troyboudreaux3427 5 жыл бұрын

I'm my universal one the 24volt side is a blue and yellow so witch one is the ground

@acservicetechchannel 5 жыл бұрын

You can power the high voltage side and test for 24v to ground with a multimeter before hooking the transformer up to the controls. The ground is the base feet of the transformer where this touches the ground frame of the unit make sure the two low voltage leads are not touching the ground, thanks

@standupforwhatsright4168 Жыл бұрын

I've got the block style transformer 24v 120v with 4 prongs. The unit is a Diamond 80 furnace. I'm wandering where the white wire or common lands on the circuit board ?? Your experience is appreciated.

@davida1421 3 жыл бұрын

Can you use a 120v/24v 50va transformer to replace a 120v/24v 40va transformer?

@acservicetechchannel 3 жыл бұрын

Absolutely

@tre2472 6 жыл бұрын

Your secondary 24v red and green wires, does it matter which one is common? The transformer just says 24v green-red.

@acservicetechchannel 6 жыл бұрын

Red is usually 24v power and yes it will matter when hooking up to an HVACR unit, thanks

@tre2472 6 жыл бұрын

AC Service Tech LLC thanks!

@Odin31b 8 ай бұрын

Think I blew this installing a new thermostat.

@alihossainali5993 7 жыл бұрын

What is the work of 100 VA. AVR? 0-98-134-183-230-249-339-462, 7 terminal?

@acservicetechchannel 7 жыл бұрын

Are you referring to watts=volts X amps?

@thomaskingsley5718 5 жыл бұрын

How about you show a cold air transformer? For the rheem 10 seer air conditioner

@thomaskingsley5718 5 жыл бұрын

Please let me know what works best for you guys are a lifesaver man it's hot took pictures of the transformer but no go

@thomaskingsley5718 5 жыл бұрын

Gotta love utube

@thomaskingsley5718 5 жыл бұрын

This is what I got here is a picc

@acservicetechchannel 5 жыл бұрын

What are you looking for? Are you saying you think you have a bad transformer? Pics don't come through on comments

@biblebloopers946 2 жыл бұрын

If 1.6 is all the transformer can handle on the low voltage side then why are there five amp fuses?

@larryreyes5055 5 жыл бұрын

Question. If I found a 40va could I replace it with a 75va? Would it be a problem?

@acservicetechchannel 5 жыл бұрын

That wouldn't be a problem, thanks

@ARCSTREAMS 5 жыл бұрын

are you available for some questions?

@acservicetechchannel 5 жыл бұрын

Just post a new comment and ask any questions, thanks

@ARCSTREAMS 5 жыл бұрын

thank you ,here is my first question,,,i have a 120vac to 12vac at 2amp trans,,i took a reading of the voltage on the outer wires of the sec and it was around 15 and then when i took the center tap to any other wire got a round 7 or so,,if its rated at 2 amps for the 12 v does this mean i should get 4 amps for the 6v if im using center tap? because i was able to nicely light a headlamp bulb with the 12 v @2amp but when i used the 6v thinking i would pull 4amp the brightness was half,,so what is going on?

@ARCSTREAMS 5 жыл бұрын

here is my second ,,you know how you get nice sparks when you short a car battery ,im wondering is this something that can be done safely if the car is off and im only plugged into the positive and negative terminals? or negative part of the chasis? without going into lot of details i basically need to be able to get those sparks for a project,so i need to have safe low volts and high enough amps to produce the sparks,i will only need to strike them every now and then and not continuous,,so am i ok using my car to do this or is there some kind of simple electric circuit i can make that plugs in any outlet or wallmart and somehow reduces the voltage yet gives me high enough amps to do this? i was thinking of a trans and a dc bridge rectifier with capacitor for such a circuit,,problem is the 12 v 2 amps from my trans does not seem to produce workable sparks strong enough for my project,,should i simply get another trans or is there another way to do this?

@retroguardian4802 11 ай бұрын

I cant understand this. If i have one that is 240v and i hook up one leg to the orange and the com on white i would have 120v. I accidentaly hooked up red and orange to my 240v legs. It burnt up so i had to watch and learn what i did wrong. I fail to understand though how it is still called 240v if we only use 1 of the 240v legs. Thanks to anyone who can explain how this works.

@kennybaker16 6 жыл бұрын

if on the 24 volt side i only have a yellow and a blue,which is common and which is hot? blue is the common,right?

@acservicetechchannel 6 жыл бұрын

Hey Kenny just check for 24v with the multimeter using one of the two wires with one probe and the other probe on the 120v common or ground, thanks

@johnnyherring4825 5 жыл бұрын

but what if there is no common its a 240 system i have it hooked up just the way video shows and getting power 120 on both orange and white wires but no 24v coming off blue or yellow wires

@HighStrung-Charleston 6 жыл бұрын

my thermo stopped working, turned out to be the 5 amp fuse so check your fuse first. $1.29 fix

@acservicetechchannel 6 жыл бұрын

Absolutely, thanks!

@kwacz Жыл бұрын

i have 230 volts on my unit

@forzamilan07 6 жыл бұрын

Isn't that aluminum wire

@acservicetechchannel 6 жыл бұрын

That is actually copper wire that is tinned with wire solder to keep the strands together. That is done from the manufacturer on components often times, thanks Phollip!

@forzamilan07 6 жыл бұрын

AC Service Tech LLC Whew I just was thinking about all those transformers I installed and it popped into my head that I may have been doing copper to aluminum this whole time

@acservicetechchannel 6 жыл бұрын

They were copper. Strands of aluminum that small would not be safe with the lower melting point. That is why we use copper conductors in homes and when stranded aluminum is used on larger gauge wires, antioxidant compound is also applied to make sure the joint is making good contact, thanks