Refrigeration – With indicator or tester – Diverse function indicators or testers
Patent
1991-10-24
1993-06-08
Wayner, William E.
Refrigeration
With indicator or tester
Diverse function indicators or testers
236 94, 3403094, F25B 4900
Patent
active
052168930
ABSTRACT:
A device for controlling the operation of a refrigeration appliance such as a domestic refrigerator consists of a circuit (2) comprising a plurality of resistive elements (3, 4, 5, 6) for generating reference signals (V.sub.A) to be compared in a comparator (18) with analog signals (V.sub.R) originating from a plurality of temperature sensors (21). The resistors have adjustable characteristics and are activated sequentially by a sequencer circuit (16) which also controls the supply of data (V.sub.C) derived from said comparisons into a memory (26, 27, 28). The sequencer circuit is connected to a control unit (35) for controlling the refrigeration appliance. The control unit reads the data from the memory at the end of each sequence of comparisons between the reference signals (V.sub.A) and the signal (V.sub.R) from the sensors, and on the basis of the data read out operate on the usual components (42, 43, 44) of the refrigeration appliance which generate and control its temperature.
REFERENCES:
patent: 4325223 (1982-04-01), Cantley
patent: 4823290 (1989-04-01), Fasack et al.
patent: 4970496 (1990-11-01), Kirkpatrick
Krefman Stephen D.
Roth Thomas J.
Turcotte Thomas E.
Wayner William E.
Whirlpool International B.V.
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