EI Type Isolation Transformers PRI.120/208/240 V AC 50/60Hz 24 V AC 40 VA Class 2 Control with Foot Mount Replacement for Jard 4031F HVAC Furnace Multi Tap Packard 42440 Gemline GT446

I connected it to a 120v source and confirmed 24 volts were coming out of the secondary side. Its easy to setup and works as expected.

I got this as a replacement for the unavailable transformer for my Mr. Heater Big Maxx garage heater. Works great. The only negative is that it is larger than the old one, but it's not a direct replacement either. Anyhow it works and I have heat in my garage and that's what's important.

Goodman air handler already had a aftermarket transformer installed, fan would not come on intermittently. This was a third the cost of an original replacement. We went for it and it works just fine. Inexpensive fix for my 24yr old central ac that blows colder than the new junk.

I bought this to go with: 24 Volts Power Input! Pureuv 14" Bulb Uv Light Coil Cleaner for Ac HVAC Coil 24v Germicidal Bulb with Magnet. The documentation was a bit confusing as to which Primary wires to use, there was only 2 secondary wires on the output side so that was settled. There were many wire colors listed in the documentation but only 4 colors on the input side. NONE of them were BROWN, which, according to the written directions, I needed to go with white and 270vAC to get 24vAC. Ended up using white and orange to get 30vAC on the output side. This worked with the device. and I wired it inline with the fan (220vAC) to get the 24vAC output I needed for the device. If not for the CONFUSING directions I would give it 5 stars. I think the generic instructions must be for MANY different transformers not just this one (JMHO).

Easy to install and worked as it should for application.

My a/c blower would 't start...and eventually I could smell plastic burning. Having no idea, I did some quick googl'ing. Determined it was likely the transformer, which I removed from the board (it smelled like the culprit; and also looked to be "cooked"). I knew it was 115/24, 2 wire in and 2 out. So, I rolled the dice and purchased this. Wired it up and attached to the unit (not the exact same size; but anyone with a brain can figure an alternate work-around). Turned the power on expecting disaster. Nope, it worked perfectly. All is well. Heat is back on.

$17 versus $400 from an AC shop. That’s A+++++ regardless if it’s a cheap part. Works perfectly on a carrier furnace needing 110V. You’ll need to choose the correct wires for your voltage needs but make sure you wire nut any wire not used.

The transformer was dead on arrival. The return was handled well. I'd recommend staying away from these cheap Chinese made transformers. This was the second China made transformer for a different seller that was bad. I ended up paying more locally, made in Vietnam, and it worked. Since this transformer didn't work, it's 1 Star from me.