Electric heating – Heating devices – With power supply and voltage or current regulation or...
Reexamination Certificate
2000-08-30
2002-10-15
Paschall, Mark (Department: 3742)
Electric heating
Heating devices
With power supply and voltage or current regulation or...
C219S483000, C219S508000, C219S519000, C392S449000, C392S454000
Reexamination Certificate
active
06465764
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
Not applicable.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not applicable.
REFERENCE TO MICROFICHE APPENDIX
Not applicable.
BACKGROUND OF THE INVENTION
This invention relates to an electric water heater and more particularly to a control system for an electric water heater having an upper and a lower heating element.
BRIEF SUMMARY OF THE INVENTION
The water heater control system operates to cycle the energization of the upper and lower heating elements. The upper element is initially energized to heat the water in the upper portion of the tank to a predetermined set temperature at which time the upper element will be de-energized and the lower element will be energized. The lower element then heats the water in the lower portion of the tank to a predetermined set temperature, at which time the lower element will be de-energized and the upper element will again be energized. The sequence of heating the water in the upper and lower portions of the tank is then repeated.
Another feature of the control system is the prevention of a “dry fire ” condition, i.e., energization of the heating elements without water in the water heater tank.
REFERENCES:
patent: 4833398 (1989-05-01), Buchan
patent: 5442157 (1995-08-01), Jackson
patent: 5808277 (1998-09-01), Dosani et al.
patent: 5968393 (1999-10-01), Demaline
patent: 6242720 (2001-06-01), Wilson et al.
Michael & Best & Friedrich LLP
Paschall Mark
State Industries, Inc.
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