Over-temperature warning system for refrigerator appliance

Details Over-temperature warning system for refrigerator appliance Over-temperature warning system for refrigerator appliance

1985-01-17

1986-08-12

Tanner, Harry B.

Refrigeration

With indicator or tester

Condition sensing

340588, G08B 1700

Patent

active

046048715

ABSTRACT:
An improved over-temperature warning system for a refrigerator/freezer appliance comprises a temperature sensor responsive to the temperature in the freezer compartment of the appliance and logic circuitry responsive to the sensor operative to detect a first over-temperature condition when the sensed temperature is greater than a first reference temperature and less than a second reference temperature and to detect a second over-temperature condition when the sensed temperature is greater than the second reference temperature. The logic circuitry times the duration of the first and second over-temperature conditions and provides a user discernible warning signal when the first condition exceeds a first predetermined time period or when the second over-temperature condition exceeds a second predetermined time period shorter than the first time period.

REFERENCES:
patent: 2526679 (1950-10-01), McCary
patent: 3136137 (1964-06-01), Crossley
patent: 3277458 (1966-10-01), Greenwood
patent: 3343151 (1967-09-01), Brown et al.
patent: 3707851 (1973-01-01), McAshan, Jr.
patent: 4240077 (1980-12-01), Hughes et al.
patent: 4283921 (1981-08-01), Prosky
patent: 4315296 (1982-02-01), Hancock
patent: 4387578 (1983-06-01), Paddock
patent: 4407141 (1983-10-01), Paddock
Althouse et al., Modern Refrigeration and Air Conditioning, The Goodheart-Willcox Company, Inc. South Holland, Ill., p. 480, (1979).

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