Refrigeration – Automatic control – By accumulation on freezing surface – e.g. – ice
Patent
1993-03-03
1994-09-13
Tanner, Harry B.
Refrigeration
Automatic control
By accumulation on freezing surface, e.g., ice
62156, F25D 2106
Patent
active
053457757
ABSTRACT:
A detection assembly is for a refrigeration system which has a cooling unit subject to frost build-up and defrost-to-drain. The assembly includes a first thermal sensor normally exposed to air but also to frost on the cooling unit or water in a plugged drain. A frost or water detection circuit has an input from the first thermal sensor, the detection circuit detects build-up of frost around the first thermal sensor and generates a defrost initiate DI signal which is connected to terminate the refrigeration to the cooling unit and then to initiate a defrost cycle wherein heat is applied to defrost the cooling unit. A second thermal sensor is in good thermal contact with said cooling unit, and a defrost terminate circuit has an input from said second thermal sensor to terminate the defrost cycle. A similar detection circuit determines the existence of ice or water in a plugged drain and terminates the refrigeration or indicates an alarm, or both. The foregoing Abstract is merely a resume of general applications, it is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.
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