Just installed zwave light switch from Lowes...
Recommended Tools: meter, wire stripper/cutter, phillips/flat screwdrivers
Single zwave switch ($34)
Remove all wires from current switch, meter wires. You should see three black, a ground, and white (usually wire nutted)
120v black goes to line, other two go to load, ground/bare wire to green screw, and you may need a short peice of 14 guage solid to pigtail off the neutral wire nut.
three way switch ($44)
For three ways, remove all wires from both switches, meter all, one should be hot (120v) this is the primary switch 'line'. You should see two black, one red, ground, and white (usually wire nutted)
Mark black wire that is hot (this is the common)
For main switch at 120v wire:
120v wire goes to line, red goes to traveler, other black to load, ground/bare to ground screw, use a short 14 guage white wire to pigtail off white wire nut, this goes to neutral.
On aux switch:
Meter, with main switch on, then when off, two should be hot- one when on, one when off (both travelers- usually one black and one red), one wire will have no voltage in either switch position.
Mark wire that is not hot in either switch position (this is the secondary/aux common)
Red to traveler (color isn't really important, BUT the traveler MUST be the same wire at each switch), white pigtail to neutral, ground/bare to green wire nut. (The other two get wire nutted together, these will not be used)
pairing to panel
Services>zwave>click the 'wrench' >enter code>add devices
(You may need to take panel off wall, and place it near primary zwave switch)
Flip switch/light on and off until switch is added...
Once paired, set rules (e.g., 'turn on at all times if any sensor reports alarm, turn off when panel disarmed')
Rules can also be set to turn on/off at certain times of day/night
Here is a video: