Go into Thermostat detail, open Temperature hysteresis controller Smart Rule and enter Limiting condition settings on the bottom. In the Limiting condition turn Enable ON, Select type Formula and in Variables section select LMTI Reed contact created in previous step. On the Right side you will see the short name for that variable, in this case Re and actual value (1 or 0). In Equation section write Re=1 - Low tariff state. Go back, and Save. This Limiting condition means that Temperature hysteresis Controller will be Enabled only when LMTI Reed contact is sends 1 that means Low Tariff - heating allowed.