Refrigerator defrost control with control of time interval...

Details Refrigerator defrost control with control of time interval... Refrigerator defrost control with control of time interval...

F - Mech Eng,Light,Heat,Weapons

25

D

341/4

F25D 21/00 (2006.01)

Patent

CA 1162269

9D-HD-13995 REFRIGERATOR DEFROST CONTROL WITH CONTROL OF TIME INTERVAL BETWEEN DEFROST CYCLES ABSTRACT OF THE DISCLOSURE Door open time in an automatic defrost refrigerator is accumulated in the memory of a microcomputer. Normal cycling of defrost is delayed by inactivating the defrost timer during periods of light usage of the refrigerator until a minimum predetermined accumulated door open time is reached. Provision is made for sensing interior refrigerator temperature to override the delaying effect of the door open measurement when a sensed over- temperature condition indicates an abnormal build-up of frost on the evaporator coils even though the refrigerator is experiencing relatively light usage. A maximum compressor run time interval between defrost cycles is provided for when no door opening occur, as during vacation periods.

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