Refrigeration apparatus defrost control

Details Refrigeration apparatus defrost control Refrigeration apparatus defrost control

1984-02-27

1985-07-23

Tanner, Harry B.

Refrigeration

Automatic control

Preventing, removing or handling atmospheric condensate

F25D 2106

Patent

active

045302189

ABSTRACT:
An improved demand defrost control system for use in a refrigeration apparatus. The control system utilizes a temperature responsive switch for switching the apparatus between "run" and "defrost" conditions. The temperature responsive switch is arranged to have controlled heat transfer relationship with the cooling system, and in the illustrated embodiment, is mounted in spaced relationship to the evaporator in the flow path of the refrigerated air, and in a preselected insulating housing. A heater is provided for controlling the operation of the switch, and the control circuit is arranged to energize the heater upon termination of the defrost cycle to positively effect transfer of the defrost control switch back to the "run" condition. The control circuit is energy-efficient and provides redundant switching control of the defrost heater to provide a fail-safe operation.

REFERENCES:
patent: 3013399 (1961-12-01), Simmons et al.
patent: 3029610 (1962-04-01), Armentrout
patent: 3138006 (1964-06-01), Moorman et al.
patent: 3188828 (1965-06-01), Wayne
patent: 3383877 (1968-05-01), Liebermann et al.
patent: 3518841 (1970-07-01), West, Jr.
patent: 3946286 (1976-03-01), Kinnunen et al.
patent: 4269035 (1981-05-01), Gelbard
"ALTECH Frost Senzor RA3 Electronic Demand Defrost Controller"-Altech Controls Corporation.

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