Please follow the below instructions on how to add/remove the Zen ZEN-01 to Almond :
Tap on “Add Sensors-->Add” on Almond to keep it in pairing mode and search for the sensor.
Now, on the Thermostat press the Reset button 5 times to add to the network, you would see the below message on the Almond LCD screen when the Thermostat is pairing:
Sensor is successfully added/paired with the Almond and could be controlled via Almond LCD Screen or Almond app.
On your Almond LCD screen tap on “Add Sensor” icon and tap on “Remove” (Not on “Remove all sensors”), Almond would be in exclusion or removal mode as shown below in the picture:
Now, on the Thermostat, press the Reset button 10 times to remove from the network. You would see the below message when the sensor is removed from the Almond.
Sensor is successfully removed from the Almond.
OEM Link: http://zenecosystems.com/zenthermostat/