Electric water heater with dry fire protection system incorporat

Details Electric water heater with dry fire protection system incorporat Electric water heater with dry fire protection system incorporat

1997-07-21

1999-09-07

Walberg, Teresa

Electric resistance heating devices

Heating devices

Tank or container type liquid heater

392455, 219481, F24H 120, H05B 302

Patent

active

059499605

ABSTRACT:
Multiple resistance type electric heating elements projecting into the interior of the storage tank portion of an electric water heater are protected against dry firing damage by using a water soluble member, representatively a sugar cube, positioned in the empty tank and blocking the spring-driven movement of a switch closure member that maintains an electrical circuit in an open state preventing electrical current flow through any of the heating elements. When the tank is initially filled with water the sugar cube dissolves, thereby unblocking the switch closure member and permitting it to be spring-driven into a circuit closing position to permit electrical current flow through the heating elements.

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Rheem/Ruud "Residential & Commercial Electric Water Heater Manual", Apr., 1996 (pp. 8 and 9).

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