Digital Thermostat

Digital Thermostat

Digital Thermostat

An energy conserving thermostatic control system having digitally implemented control functions for use with a heating and/or air conditioning system is disclosed. The digital thermostat includes an LCD data display for simultaneously displaying present time and ambient temperature. Slide switches are provided for setting and indicating set point information such as day temperature, night temperature, night-to-day transition time, and day-to-night transition time. The switch contacts of each slide switch are multiplexed to the display driver conductors for conveying time and temperature set point data during time and temperature scan intervals which alternate with a air damper. Strobe signals which are applied to the driver conductors are counted during the alternate scan intervals for selecting a day temperature different from a night temperature, for selecting the times whichdivide night from day and for providing set-back to night temperature during a predetermined time of the day. A day-skipper circuit inhibits set-back on selected days. A power divider circuit is provided which permits wire-for-wire substitution of the modulating valves for a conventional electro-mechanical thermostat.

The present invention relates to thermostatic control systems for regulating the ambient temperature of an enclosed area such as the living space of a home or office, and in particular to a digital electronic thermostat for automatically controlling the operation of heat transfer apparatus in which the motorized valve the heat transfer apparatus on and off to maintain the ambient temperature within a living space at either an energy conserving temperature level or a comfort temperature level during selected periods of night and day, respectively, and at the energy conserving temperature level during selected set-back periods.

An additional limitation on the adaptation of electro-mechanical thermostat/timer combinations for regulating ambient temperature at two different temperature levels and for providing either day set-back or night set-back is the requirement of a large number of data input control circuits for manually setting time and temperature set point information.

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Digital Thermostat

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