Water heater control circuit including an empty tank sensor

Details Water heater control circuit including an empty tank sensor Water heater control circuit including an empty tank sensor

1993-12-15

1995-07-25

Paschall, Mark H.

Electric resistance heating devices

Heating devices

Tank or container type liquid heater

392442, 374102, 374107, 340589, 219497, 219501, H05B 102

Patent

active

054370027

ABSTRACT:
A water heating system for a commercial coffee brewer includes a control circuit having a dry bowl cut out circuit. The system includes a control circuit, tank, and heater. The dry bowl cut out circuit receives a differentiated temperature signal and generates a control signal when the differentiated signal is above a predetermined threshold. The control signal represents that the tank is empty. The heater is turned OFF in response to the control signal. Also, the control circuit includes an operating temperature circuit and high limit temperature circuit for controlling the heater. A switch in the heater is electromagnetically coupled to the control circuit.

REFERENCES:
patent: 4360128 (1982-11-01), Neumann
patent: 4409694 (1983-10-01), Barrett, Sr. et al.
patent: 4551611 (1985-11-01), Longo
patent: 4633066 (1986-12-01), Chang
patent: 4641011 (1987-02-01), Roberts
patent: 4641012 (1987-02-01), Roberts
patent: 4670404 (1987-06-01), Swift et al.
patent: 4838152 (1989-06-01), Kubicko
patent: 4841849 (1989-06-01), Shimomura et al.
patent: 4886955 (1989-12-01), Kimura
patent: 5183998 (1993-02-01), Hoffman et al.
patent: 5229751 (1993-07-01), Chandler et al.

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