Defrost cycle controller

F - Mech Eng,Light,Heat,Weapons – 25 – B

Patent

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Details

F25B 49/00 (2006.01) F25B 47/02 (2006.01) F25D 21/00 (2006.01) F25D 21/08 (2006.01) H01H 47/00 (2006.01) H01H 47/22 (2006.01) H01H 3/00 (2006.01) H01H 47/04 (2006.01) H01H 47/10 (2006.01)

Patent

CA 2106555

A defrost controller for a refrigerator/freezer including one or more of the following features: (1) a timer module that can serve as a real time, cumulative time or variable time defrost timer; (2) an algorithm to control defrosting in view of frequent power outages; (3) a power up defrost cycle; (4) a default reaction to loss of compressor run information; (5) a simple manufacturing test initiator; (6) a test initialization via thermostat actuation; (7) a relay power supply which supplies two different energization voltages; (8) a relay energization signal which decays rapidly from a voltage in excess of the relay rated voltage to a voltage within the relay rated voltage; and (9) respective relay energization sequence to overcome light contact welding.

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