Refrigeration – With indicator or tester – Position or extent of motion of movable element
Patent
1993-12-27
1994-11-15
Tanner, Harry B.
Refrigeration
With indicator or tester
Position or extent of motion of movable element
62151, F25B 4902
Patent
active
053636678
ABSTRACT:
A defrost cycle controller for a refrigerator or freezer having a compressor and a defrost heater, comprising a relay operatively connected to the compressor and the defrost heater via contacts to couple one or the other to a power supply, the relay having a normally closed contact to which said compressor is connected and a normally open contact to which said defrost heater is connected; and a control circuit operatively connected to the compressor, defrost heater and relay and configured to implement the following algorithm: (a) first, energize the relay; (b) second, monitor the relay contacts; (c) third, if the contacts do not change states, de-energize the relay; and (d) fourth, rest for a predetermined period, and then commence the algorithm.
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Bradley Greg A.
Guess Ronald W.
Janke Donald E.
Szynal Joseph M.
Tanner Harry B.
Whirlpool Corporation
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