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Are you using a current sensing relay?
And are you going to use the humidistat that came with it to control humidity?
great. The digital controller has the terminals
R C A B ODT ODT W G H H GF
from your furnace control board where all the thermostat wires hook in you are going to run a wire from the R terminal of that board to the R terminal of the controller.
Run a wire from the C terminal of that board to the C terminal of the controller.
Your outdoor temperature sensor goes into the ODT terminals of controller.
Run a wire from the W terminal of the furnace board to the W terminal of the controler
At your furnace control board you will find a wire under G (should be green wire). You take that wire out of the G terminal and wire nut a wire onto it to extend that green wire up to the controller G terminal.
Then run a wire from the controller Gf terminal down to the furnace control board G terminal.
out of the transformer provided with the humidifier you have 2 low voltage wires. One wire will go up to the controller and hook to one of the H terminals. The other one will go up to one of the two yellow wires hanging off the humidifier itself. Then the other yellow wire on the humidifier will run up and hook to the other H terminal on the controller.
you can mount it just about anywhere you please. It has to hook into 120v somewhere so most often it just mounts right inside the furnace cabinet somewhere so that you can splice off the incoming 120v feed that supply's the furnace power. Will be a white and black wire that is wire nutted into the furnace high voltage feeds.
You will want to make sure high voltage is off to the furnace. Normally you will have to provide larger wire nuts now that you have 3 wires being put together instead of just the two that are already together in the furnace now for high voltage.
Sure thing, I check back in periodically throughout the day.
There should be a high voltage wire/whip that runs into the side of the furnace. This wire comes from either a toggle switch next to the furnace or if the furnace is within 6' of the breaker box it will run directly from the box into the furnace. Depending on the model furnace you have the wires will lead into an area where they then wire nut into two wires leading off the furnace. The hot lead (black wire) normally comes off the door safety switch. This switch is pressed in when the furnace doors are securely put on. The white lead (neutral) will lead from the furnace control board up to the wire coming into the furnace either from said toggle switch or from breaker box.
Most often these wire nut connections are behind a little metal box that covers them up. You have to take the little screw out of the little metal box so the side of it pulls off and exposes these wire nut connections.
http://www.nastyz28.com/forum/gallery/data/500/DSCF0658.JPG in this picture it's on the right side. The metal conduit outside the furnace has the high voltage wire in it and leads into this box where the wire nut connections are made
And correct. If your particular transformer has two little screw terminals on it and not wires then that is where the low voltage ties in.