How can I wire my OLD APT WIRING with this product?

SOURCE: Install a single pole light dimmer

House wires are for a 3 way switch, you will need a different switch

SOURCE: Trying to install trimatron 120vac push dimmer

Called the guys at Home Depot and they helped me over the phone.
thanks

SOURCE: Trimatron 3 way push on off dimmer switch

One wire is the common and the other two are the travelers.The trick is to find which one is which.... If you can see into the electrical box check to see if one of the red wires and the black wire are from the same cable, if they are then more than likely those two wires are the travelers; you can also look at the other switch and see which two wires are on the brass colored screws, those would also be travelers. The common is usually the wire that is on the black colored screw. Once you figure out which wire is your common, I'm thinking that it is one of your red wires, you would attach that wire to the black wire on the dimmer and the other two wires to the 2 red wires on your dimmer.

SOURCE: Have a Leviton dimmer with red, black and green

You are correct in assuming green is the ground and connects to bare copper wire. Black is always the HOT wire and should be attached to the black wire. Red wire connects to white wire.

SOURCE: I have a trimatron dimmer which has a black, red,

When you take the existing switch out of the wall, the existing switch will have one black screw and two gold screws. The wire that is connected to the black screw of the existing switch (probably on of the black wires from the box) connects to the black wire on the new dimmer. The other two wires (one black and one red from the box) that are connected to the two gold screws on the existing switch will connect to the two red wires on the new dimmer. Basically, wire from black screw goes to new black wire and wires from gold screws go to new red wires.