Water heater with dry tank or sediment detection feature

Details Water heater with dry tank or sediment detection feature Water heater with dry tank or sediment detection feature

2006-06-27

2008-10-14

Wilson, Gregory A (Department: 3749)

Liquid heaters and vaporizers

Stand boiler

And condition responsive feature

Reexamination Certificate

active

07434544

ABSTRACT:
One or more embodiments of a controller for controlling a fuel-fired water heater are provided that are able to detect a high rate of temperature change condition in the water heater tank. The fuel fired water heater appliance having a water storage vessel comprises a surface mount sensor disposed on the outer surface of the storage vessel near the bottom of the vessel, for sensing the temperature of the vessel. The controller monitors the rate of change of the temperature sensed by the surface mount sensor during a heating cycle, and discontinues operation of the water heater appliance upon detecting an increase in the rate of temperature change that is indicative of an undesirable level of sediment build-up in the water storage vessel.

REFERENCES:
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patent: 5125068 (1992-06-01), McNair et al.
patent: 6053130 (2000-04-01), Shellenberger
patent: 6606968 (2003-08-01), Iwama et al.
patent: 6701874 (2004-03-01), Schultz et al.
patent: 6880493 (2005-04-01), Clifford
patent: 7032542 (2006-04-01), Donnelly et al.
patent: 7167813 (2007-01-01), Chian et al.

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