F - Mech Eng,Light,Heat,Weapons – 25 – D
Patent
F - Mech Eng,Light,Heat,Weapons
25
D
341/4
F25D 21/00 (2006.01) F25D 21/02 (2006.01) F25D 29/00 (2006.01)
Patent
CA 1180081
9D-AE-14817 APPARATUS AND METHOD OF DETECTING FAILURE IN A REFRIGERATOR DEFROST SYSTEM ABSTRACT OF THE DISCLOSURE A defrost system for refrigerating apparatus having a refrigerating mode and a defrosting mode including an evaporator and an electric resistance heater in heat transfer relationship with the evaporator. There is provided a timer to actuate a normally open defrost initiation switch to energize the heater periodically and initiate a defrosting mode. A defrost terminating thermostat switch is in the heater circuit and will open at a predetermined elevated temperature to deenergize the heater and close at a lower temperature. A voltage sensor across the normally open frost initiation switch senses periodically and provides a signal when voltage in the heater circuit is interrupted. The multiple voltage sensor signals are stored in a memory bank over a predetermined period of time and when the voltage is interrupted for the predetermined period of time, an alarm is actuated to indicate failure of the defrost system.
406018
Company General Electric
Eckersley Raymond A.
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