3-Way Diagrams for ZEN73, ZEN74, ZEN76, and ZEN77 Switches

A 3-way installation is a 2-point control set-up where you can control your lights from 2 different switches. The S2 smart switches are perfect for that use and feature a patented solution that makes multi-way wiring fast and easy. Just locate the box with power and neutral and install the device according to the appropriate diagram.

How do you find direct connection to power? The easiest way is to locate a black wire bundle and white wire bundle in the back of your multi-gang box. If you're dealing with single boxes only, you'll need to measure voltage on the black leads coming into each box in a 14-2 romex. Still not sure what you're looking for? Send us a few pics and we'll help!

PLEASE READ before you proceed with the installation:

A 3-way is what we call 2-point control so 2 different switches controlling the same set of lights.
These instructions can only be used with the ZEN73, ZEN74, ZEN76, and ZEN77 models. (If you have ZEN71, ZEN72, or ZEN32 switches, please click here for 3-way wiring diagrams)
You have to install the Zooz switch in the box with direct connection to power line and neutral.
Always use simple on/off 3-way switches when connecting them to Zooz switches. No dimmers or electronic switches with a LED indicator may be wired to Zooz switches or dimmers.
There are many different types of 3-way switches, some will have common terminals on top of the switch, some on the bottom. Always locate the common terminals first and adjust the orientation of the wires accordingly. Don't follow the diagrams blindly.
The colors of your wires may not match the ones in our diagrams so please make sure you've identified all wires correctly based on their source, not color only.
IMPORTANT: Once you connect your switches, please secure them in the box, making sure any bare wires and screws are isolated with electrical tape. After the switches are settled back in the box and the wall plate is re-installed, you can turn the power on and test the switches for on/off operation.
The diagrams show all connections but ground (it was excluded to simplify the illustration). Make sure all ground wires are connected to all switches respectively.

Once you're 100% sure you've identified the wires, please make sure power is off and wire the Zooz switch according to the instructions below.

Here are the written instructions for each of the 3 diagrams above. Please make sure you've identified power (line) and connection to the light (load) with 100% certainty before you proceed.

OPTION 1 with direct connection to load and line in the same box:

In this scenario, one of the wires from the 14-3 romex that carries the traveler will be used to carry power or load (connection to the light) to common on the 3-way switch in the other box. In our diagram, in the "before" option, we show the most common situation in our experience where power is carried to the second box using one of the wires traveling from box 1 to box 2. Since Zooz switches need direct connection to power, in the "after" diagram we show that whatever connection was carried over from box 1 to box 2 in the "before" scenario, we always need to connect the Zooz switch to the direct power source in box 1 and the connection traveling from box 1 to common on the switch in box 2 is always going to be the connection to the light (load).

BOX 1 (the box with power where your Zooz switch goes - this is the only box the Zooz switch can be installed in for these models):
1. Disconnect the black wire coming from your 14-3 romex (make sure this is the wire that connects to common on the regular 3-way switch in box 2) and connect it under a wire nut with the black wire from the 14-2 romex going to the lights.
2. Run a jumper wire (a piece of 14 AWG wire) from the black power source bundle to the Line terminal on the Zooz switch (or if there's a single wire with power in the box, connect that single wire to the Line terminal).
3. Connect the red wire from the 14-3 romex to the Traveler terminal on the Zooz switch.
4. Connect the white wire from the 14-3 romex to the Load terminal on the Zooz switch.
5. Run a jumper wire (included in the packaging) from the white wire bundle to the Neutral terminal on the Zooz switch.

6. Connect ground to ground.

Leave the switch in the other box wired as it is (no changes needed provided that it's wired as shown in the diagram: black wire to common, red and white wires to traveler terminals).

OPTION 2 with direct connection to load and line in separate boxes (most common):

BOX 1 (the box with power where your Zooz switch goes - this is the only box the Zooz switch can be installed in for these models):
1. Connect the black wire coming from your 14-3 romex to the Load terminal on the Zooz switch (make sure that wire connects to one of the traveler terminals on the regular switch in box 2).
2. Connect the black wire coming from the black power source bundle to the Line terminal on the Zooz switch (or if there's a single wire with power in the box, connect that single wire to the Line terminal).
3. Connect the red wire from the 14-3 romex to the Traveler terminal on the Zooz switch (make sure that wire connects to one of the traveler terminals on the regular switch in box 2).
4. Run a jumper wire (included in the packaging) from the white wire bundle to the Neutral terminal on the Zooz switch.
5. Connect ground to ground.

Leave the switch in the other box wired as it is (no changes needed provided that it's wired as shown in the diagram: black wire from the 14-2 romex going to the light connected to common, red and black wires from the 14-3 traveler romex connected to traveler terminals).

OPTION 3 with traveler wires meeting at the light fixture (least common):

BOX 1 (the box with power where your Zooz switch goes - this is the only box the Zooz switch can be installed in for these models):
1. Connect the black wire coming from your 14-3 romex to the Load terminal on the Zooz switch (make sure that wire connects to one of the traveler terminals on the regular switch in box 2 - you will need to open the fixture box to verify these connections).
2. Connect the black wire coming from the black power source bundle to the Line terminal on the Zooz switch (or if there's a single wire with power in the box, connect that single wire to the Line terminal).
3. Connect the red wire from the 14-3 romex to the Traveler terminal on the Zooz switch (make sure that wire connects to one of the traveler terminals on the regular switch in box 2 - you will need to open the fixture box to verify these connections).
4. Run a jumper wire (included in the packaging) from the white wire bundle to the Neutral terminal on the Zooz switch.
5. Connect ground to ground.

Leave the switch in the other box wired as it is. No changes are needed provided that it's wired as shown in the diagram: black wire going to the light connected to common, red and white wires from the 14-3 traveler romex connected to traveler terminals. Note that in this scenario traveler wires meet at the light fixture and connect the black and red wire from the 14-3 traveler romex coming from box 1 with the red and white wires from the 14-3 romex going to box 2.

These diagrams illustrate the most common 3-way set-up. However, there are many ways to wire 3-way installations. If you're not able to match yours with the below "before" drawing, please do NOT pick the closest option. Trial and error approach is dangerous with high-voltage installations. Instead, reach out to us first for custom wiring instructions.