Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1980-09-02
1982-06-01
Reynolds, B. A.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
219483, 219486, 307 39, 307 40, H05B 102
Patent
active
043330029
ABSTRACT:
A step controller for a water heater having a plurality of individual electrical heating elements changes the number of energized elements to maintain a predetermined minimum temperature. A thermistor sensor monitors the temperature of the water and generates a proportional signal. Preset potentiometers establish set point temperature signal and a dead band signal. The number of "on" elements is related to the difference between the sensed water temperature and the preset water temperature divided by the dead band factor. The heating elements are turned "on" and "off" in a predetermined sequence whenever a change is required. The sequence includes turning on the heating element which has been off for the longest period and turning off the heating element which has been on for the longest period. The controller includes a microprocessor unit to periodically sense the signals of the sensor and potentiometer and to store the on-off status of the heating elements and the historical sequence of when each heating element was turned on or off in relationship to all of the other heating elements. The microprocessor periodically updates the status by processing of the last read and stored signals to determine the number of elements which should be "on", compares it to the actual number of elements on, and creates appropriate control signals for turning the individual element on and off in proper sequence.
REFERENCES:
patent: 3586869 (1971-06-01), Kompelien
patent: 3770977 (1973-11-01), McIntosh
patent: 3787729 (1974-01-01), Bennett
patent: 3952182 (1976-04-01), Flanders
patent: 4058702 (1977-11-01), Jerles
patent: 4110632 (1978-08-01), Wyland
patent: 4181950 (1980-01-01), Carter
A. O. Smith Corporation
Paschall M.
Reynolds B. A.
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