I am installing a humidifier. It comes with a 120vac to 24vac transformer to be installed. The transformer has a label on it that says install in electrical box only. One side of the transformer is designed to screw into an electrical box knockout and has leads coming through the middle of this for connection to the 120VAC input.Is the transformer supposed to be screwed into the electrical box on the outside or the inside. At first, I assumed inside but this would result in my connection leads being on the outside. ThanksBill
bill its supposed to be mounted to the board area of the furnace, the black and white 110 leads go on the board of most furnaces you must add the spade connectors, then run your two wire to the controls and wire nut them to the colored wires on the 24v side. if you cant mount this to the board then zip tie it to the wiring harness.
your line voltage leads should be inside and connections to low volt outside,but neither side needs to be exposed to the weather or an open area,if someone touches the leads evern though its 24 volts it still hurts,and it doesnt need to get wet
Your furnace has a tranformer already and may be big enough to power the motor without installing a new one. If not install it next to the existing one behind the panel of the furnace. Or you can buy the proper size box with knock outs for everything to fit. Older homes have them screwed to floor joist and other ways. Be safe and turn the furnace power off before working or pulling the panel.
you are going to be able to desire to get the 24 volt administration transformers. they are type 2 (this skill that if the wires get shorted the capability output is going down and you are going to be able to't have a fire began by skill of the quick). they generally contain a installation it is made to pass interior a knockout with the line voltage wires protruding interior. The transformer itself stands proud and has screw terminals for the low voltage area. different styles of transfomers won't meet the code using fact they pose a fire possibility.
The transformer is designed to be mounted on top the 120v junction box that exists inside the furnace. In most new furnaces there should be two extra wires in said junction box, one marked EAC and one marked HUM hook the black wire from the transformer to the one marked HUM and the white wire from the transformer to the two white wires already connected together within that junction box. This will provide power to the transformer only when there is a call for heat. The low voltage wiring connections should be pretty easy to follow in the instructions. NEVER, I repeat, NEVER power the humidifier using the transformer supplying low voltage control power to the furnace, 9 times out of 10 you will overload it.
