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

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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[Mowers]

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.

[obrianthinline]

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]

Thank you very much for your comments, they are appreciated

[sirmixalot]

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

[glennbulle]

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.

[stupidhurts]

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!

[philiph]

Hello Craig. Can you comment about some transformers that ground one leg of the secondary to the cabinet ? Often when you look at voltage of each secondary leg to cabinet, you get R at 16 volts and C at 8 volts.

[st.charlesstreet]

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

[TexasEngineer]

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.

[hiseminencetheholymacdiarmada]

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!

[johnnylongchord]

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

[stephentackett]

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.

[nickpanhead]

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.

[danielisraelyan]

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

[dapperdon]

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

[gibby]

Which wire do you connect the 3 amp fuse to?

[gustavoperez]

I installed an Ameristar furnace, keeps blowing the fuse and the transformer. What do you think it could be the case for it?

[Mr]

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..

[Mrjuniorfly]

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?