Importance

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Abstract

A programmable thermostatic control device for controlling the temperature within a preselected zone of an enclosed environment. The device can be readily installed and utilizes an interface unit through which the heating, ventilation and cooling system of a building and/or residence are connected to the device outputs. An operator is guided through the programming of the device by cueing or prompting lights which sequentially indicate the information to be entered on the keypad. The device is processor-based and controls the heating and cooling systems to maintain a preselected temperature range, and to establish a preselected temperature within the controlled zone at a predetermined time. The temperature within the control zone is established and/or maintained with maximum efficiency by controlling the stage and duration of energization of the heating and air conditioning units. To this end, means are provided for determining and continuously updating the recovery time necessary for establishing a preselected temperature, and utilizing this information to control the HVAC units.

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First Claim