An interactive electronic thermostat operates to communicate with an installer through an audible or visual display and keypad to instruct the installer to perform tasks and enter observations to effect proper connections at the thermostat of heater/air conditioner wires in spite of the absence of labels...http://www.google.es/patents/US5161606?utm_source=gb-gplus-sharePatente US5161606 - Interactive electronic thermostat with minimum and maximum temperature thermal limit switches
Interactive electronic thermostat with minimum and maximum temperature ...
