subject: Some Objects Of The Digital Thermostat [print this page] Some objects of the digital thermostat The principal object of the digital thermostat is to provide an improved energy conserving thermostatic control which utilizes digital control circuits for regulating the operation of heating and/or air conditioning systems(air damper) Another object of the invention is to provide a room thermostat control which will automatically regulate the temperature of a home or office at a selected night temperature and at a selected day temperature during predetermined times of night and day, respectively. Yet another object of the programmable thermostat is to provide such a digital thermostatic control which can be used for automatically regulating the temperature of the controlled area at either a comfort temperature level or an energy conservation level in combination with both heating and air conditioning systems.
Still another object of the floor heating thermostat is to provide such a digital thermostatic control which may be substituted for a conventional electro-mechanical thermostatic control without modification of the heat transfer apparatus. According to this arrangement, the conductive path is maintained in the open circuit condition during the absence of the command signal and during the interval commencing with the turn-off of the semiconductor switch responsive to an excursion of the source current waveform outside of the holding current threshold level and terminating with the initiation of conduction in the switch in response to the application of a delayed gate signal to the gate of the switch. In the absence of a command signal, that is when the control relay is not energized, current is conducted through the system control relay and through the power converter circuit at a level which will not cause inadvertent operation of the system control relay. Another object of the digital thermostat is to provide such a digital thermostatic control which consumes a minimum of power and which derives its operating power from available power conductors without interfering with or being affected by operation of the heating or air conditioning equipment powered from the circuit from which the thermostat power is derived.
