Heatit Z-wave app (v2.7.1)

[TedTolboom]

@Nerohan_Selvendran let’s create another entry into the FAQ…

@TedTolboom

Create link between the Heatit Z-TRM2fx thermostat and a (Z-Water) relay device:

There are 2 options to link the Heatit Z-TRM2fx to one of the Z-Water relays:

• Using flows, with additional logic, within Homey: the easiest to setup and possible to link to any device (independent of protocol), but will add a minor delay (will not matter in most setups)
• via direct associations between the Heatit Z-TRM2fx and the Z-Water relays: direct communication between the two devices on the same network, without involvement of Homey

How to setup:

Option A. Using flows within Homey

Create the following 2 flows (basic setup):

1. Create the first flow to switch on the relay when the Z-TRM2fx goes into active state
   WHEN… “Thermostat turned on” (Z-TRM2fx thermostat)

THEN… “Turn on” (Z-Water Relay x)

2. Create the second flow to switch off the relay when the Z-TRM2fx goes into idle state
   WHEN… “Thermostat turned off” (Z-TRM2fx thermostat) THEN… “Turn off” (Z-Water Relay x)

By using the logic of Homey’s flows, you can easily expand the flows with adding additional conditions to only turn on the heater when someone is at home.
In that case, you could:

1. Create the first flow to switch on the relay when the Z-TRM2fx goes into active state
   WHEN… “Thermostat turned on” (Z-TRM2fx thermostat)
   AND… “Someone is at home” (invert the “Nobody is at home” of Presence"

THEN… “Turn on” (Z-Water Relay x)
2. Create a third flow:
WHEN… “The first person came home”

AND… “Themostat is on” (Z-TRM2fx thermostat)

THEN… “Turn on” (Z-Water Relay x)

You’re all set. Relay 8 of the Z-Water should now switch on when the Z-TRM2fx thermostat changes to the active state, and switch off when the thermostat goes into idle state.

Notes:

• “Z-Water Relay x” can in this example be any device Homey is able to control: Z-wave / Zigbee / 433Mhz / Wifi
• Adding additional logic is only possible by using Homey’s flows. This is not possible with Direct associations

Option B. Direct association (Z-wave)

Direct associations are commands send from one Z-wave device to another based on predefined Command Classes.

For correct setup:

• both devices need to be in the same Z-wave network (share the same controller) and need to have the same security state (secured / non-secured).
• Considering the S2 security issues with the Z-TRM2fx and the Z-Water, it is highly recommended to re-include both devices non-securely based on the BETA branch of the Heatit app (> 2.3.0 release).

To setup the right association between both devices

1. Lookup the Device ID of the Z-water regulator by going to device settings > Advanced settings > Z-wave Device Information > Device ID. In this example I will assume Device ID is 128
2. The individual relays can be controlled by sending a command to the corresponding endpoint of the Z-water regulators Device ID . So relay 1 corresponds to endpoint 128.1 , relay 2 corresponds to 128.2 , so relay x corresponds to 128.x
3. To setup the correct direct association, go to the device settings of the Z-TRM2fx thermostat you’d like to control that specific relay: Z-TRM2fx thermostat > device settings > Advanced settings > Associations > Group 4
4. Add the desired endpoint to Group 4. You should not remove the 1 which is already present; so if you want to add relay 1 of the Z-water device with Device ID 128 , update the content of Group 4 to 1,128.1 (no space in between).

5. Press <Back to go back to the advanced settings, the association groups should look like:

6. Press at the top right of the screen (next to the Advanced settings title) to save the associations

You’re all set. Relay 1 of the Z-Water should not switch on when the Z-TRM2fx thermostat changes to the active state, and switch off when the thermostat goes into idle state.

Let me know if this is helpfull or if you still have questions to create the right setup.