Demand defrost system

Details Demand defrost system Demand defrost system

1981-06-08

1983-10-18

Wayner, William E.

Refrigeration

Automatic control

By accumulation on freezing surface, e.g., ice

62156, 2502222, F25D 2102

Patent

active

044097956

ABSTRACT:
A demand defrost system is provided for detecting the existence of frost build-up on the surface of the heat exchanger of a cooling system. A light beam is directed through the heat exchanger such that frost build-up blocks the path of the light from reaching a photocell. When the light received by the photocell falls below a selected value, a control signal is produced which discontinues cooling operation of the cooling system and initiates defrost heaters which heat the cooling coils and remove the frost build-up thereon. A temperature sensing switch is also provided which reinitiates the cooling cycle after a temperature indicates that frost has been removed from the cooling coils.

REFERENCES:
patent: 2377926 (1945-06-01), Dreier
patent: 3120108 (1964-02-01), Pansing
patent: 3961495 (1976-06-01), Beauvent et al.

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