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US 4,392,358 AGranted
Apparatus and method of detecting failure in a refrigerator defrost system
AssigneeGeneral Electric Company
InventorFrederick E. Hicks
Life of this patent
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AssigneeGeneral Electric Company
InventorFrederick E. Hicks
Estimating the term…
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 defrost 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.
The method of detecting defrost circuit failure in a refrigerating system having a refrigerating mode and a defrosting mode including an evaporator with an electric resistance heater in heat transfer relationship with the evaporator comprising:
A defrost system for refrigerating apparatus having a refrigerating mode and a defrosting mode and including an evaporator and an electric resistance heater in heat transfer relationship with the evaporator comprising:
Dependencies are inferred from the claim text.