Electronic thermostat with repetitive operation cycle

Automatic temperature and humidity regulation – With timing element – Timer other than clock

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Details

165 12, 34030915, F23N 520

Patent

active

044692749

ABSTRACT:
An electronic multiple-setback thermostat for residential and commercial use includes an internal clock having a week-long cycle. The thermostat is programmed by the operator, usually manually actuable input devices, to control the furnace/air conditioning system to achieve a schedule of temperatures over the weekly period by simply inputting the temperature desired to be attained at the time of entry. Each temperature entry may be programmed to reoccur on a daily basis or to modify the program on a once-a-week basis. The thermostat employs an internal clock which controls memory addresses so that each memory location is representative of a short time period during the weekly cycle. A desired temperature signal is entered in a memory location determined by the clock state at the time of entry and is read out to the control system each time that time state reoccurs.The external temperature sensor employs a thermistor controlled oscillator that is used as the system clock source during failures of the primary power source.

REFERENCES:
patent: 4200910 (1980-04-01), Hall
patent: 4235368 (1980-11-01), Neel
patent: 4298163 (1981-11-01), Richardson et al.

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