I have a ZFM-80 that I’m using in a different setup, but it’ll be essentially the same thing. I’m not going to assume you know too much here, so sorry if it sounds like I’m insulting your intelligence. I’d rather give you too much info than not enough.
Here’s what you need to do… first check out the documentation here if you don’t already have it:
Look at the illustration on the top of the second column you’ll notice that you have 3 sets of terminals labeled D, E, and F.
The E-terminals are what we’ll connect to your garage door. You should have two wires or terminals on your garage door that when shorted (connected) tell the garage door to open or close. You’re going to run wires between those terminals and the E-terminals on your relay. Run them in parallel with any existing wires connected to those terminals. (That is to say: don’t REMOVE any wires from the terminals on your garage door. If you do that, you’re existing button won’t work.)
Next we need to connect normal house current to the F-terminals on the relay. The easiest way to do this I found was to simply take an old lamp cord or extension cord… cut off the end opposite from the plug, and then connect the bare wires to the leads. Now you can just plug it in to any available outlet. Makes it easy to remove it later if you want too, and you don’t have to worry about tapping into any house current. If you don’t have an available outlet though you’ll need to connect to house current some other way.
That’s it for the wiring. Now plug in your relay or turn on the breaker and it should be working. There is one important set to do yet software-wise after getting connected to your hub. You need to change the device type from Z-wave switch to a Z-wave Virtual Momentary Contact Switch. You do this in the IDE (if you’ve never messed around in the IDE, let me know and I’ll walk you through the steps there). What this does is makes SmartThings treat this on/off switch and a push button. Once the Hub sees this device turn on, it turns it off automatically, nearly instantly. IF you don’t do this the relay will stay on until you go into ST and turn it off or physically push the button on the relay to turn it off.
So that’s it… should be a pretty easy install. Let me know if anything is unclear or confusing.