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An electronic programmable thermostat for the control of a furnace or air conditioner is useful as a replacement for a conventional non-programmable thermostat and mounts on the non-programmable thermostat\s wall plate to achieve support, electrical connection with the load and power supply, and the

An electronic programmable thermostat for the control of a furnace or air conditioner is useful as a replacement for a conventional non-programmable thermostat and mounts on the non-programmable thermostat\s wall plate to achieve support, electrical connection with the load and power supply, and the use of certain manual controls supported on the wall plate. The programmable thermostat employs a circular printed circuit board supporting its electronic components, which include a potentiometer for operator adjustment of desired temperature. A flat circular knob supported on the potentiometer shaft and an annular bezel cover the thermostat and allow access to the manual controls supported on the wall plate. The potentiometer and a temperature sensing thermistor control the frequency of a pulse generator which provides input to a counter. The resulting digital signal is compared with a digital signal generated under control of a clock and manually actuable programming switches, to generate an output control signal for the load.

대표청구항 ▼

An electronic thermostat for the control of a temperature modifying load, comprising: a component having an electrical characteristic which is a function of the ambient temperature; a manually adjustable control member having a continuously adjustable analog electrical characteristic, and correspond

An electronic thermostat for the control of a temperature modifying load, comprising: a component having an electrical characteristic which is a function of the ambient temperature; a manually adjustable control member having a continuously adjustable analog electrical characteristic, and corresponding temperature-related indicia, for entering a desired temperature set-point; electronic means operative to generate a digital signal having a value which is a function of the sum of the electrical characteristics of said component and said control member, and operative to use said digital signal to generate an output control signal for the temperature modifying load which modifies the ambient temperature to restore said digital signal to a constant value.