Refrigeration system control method and apparatus

Details Refrigeration system control method and apparatus Refrigeration system control method and apparatus

1977-07-15

1979-05-01

Wayner, William E.

Refrigeration

Automatic control

Preventing, removing or handling atmospheric condensate

62156, 62234, F25D 2102

Patent

active

041517237

ABSTRACT:
A refrigeration system contains a common compressor supplying refrigerant to a plurality of evaporators that are refrigerated and defrosted independently of one another. Individual refrigeration/defrost controls are provided in solid state form for the respective evaporators, and the individual controls are connected with a master control that prevents all of the evaporators from being defrosted at one time. The master control includes a digital time clock providing time signals to each of the individual refrigeration/defrost controls, and each of the individual controls can initiate a defrost operation for its respective evaporator on either a timed or demand basis. The master control includes a scanner that interrogates the individual controls in a special manner to initiate defrosting of the units in order of priority. The master control permits an individual defrost control for a selected evaporator to be tested in a timed mode by substantially increasing the speed of the time clock while operation of the remaining defrost controls is inhibited.

REFERENCES:
patent: 3453837 (1969-07-01), Sandstrom et al.
patent: 3483555 (1969-12-01), Birard et al.
patent: 3894404 (1975-07-01), Stanton
Serial #812,198, Willitts et al., Filed 7/1/77, Commanly Assigned.

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