Electric resistance heating devices – Heating devices – Tank or container type liquid heater
Patent
1989-09-06
1990-11-20
Reynolds, Bruce A.
Electric resistance heating devices
Heating devices
Tank or container type liquid heater
204196, 204197, F24H 100
Patent
active
049720660
ABSTRACT:
The adverse effects of the exposed metal jacket on a heating element in an electric water heater on the life and performance of a protective anode are eliminated or substantially reduced with the system that imposes a low voltage differential between the heating element jacket and the tank wall while simultaneously providing a low resistance current path which will provide a direct coductive path between the jacket and tank wall (at ground) in the event of an overvoltage condition. The system includes a potentiometer control which may be adjusted to provide the appropriate low voltage differential sufficient to substantially reduce the anode current. The relatively low resistance path allows an overvoltage current to pass readily to ground.
REFERENCES:
patent: 3132082 (1964-05-01), Overmyer
patent: 3176115 (1963-05-01), Balis
patent: 3425921 (1969-02-01), Sudrabin
patent: 4255242 (1981-03-01), Freeman
patent: 4255647 (1981-03-01), Rickert et al.
patent: 4848616 (1989-07-01), Nozaki
Houle Timothy H.
Wardy Daher T.
A.O. Smith Corporation
Hoang Tu
Reynolds Bruce A.
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