Refrigeration – With indicator or tester – Atmospheric condensation accumulation – e.g. – frost
Patent
1978-07-28
1980-06-10
Wayner, William E.
Refrigeration
With indicator or tester
Atmospheric condensation accumulation, e.g., frost
62234, 165 12, 3403094, F25D 2100
Patent
active
042066123
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.
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patent: 3978322 (1976-08-01), Dobkin
Emhart Industries Inc.
Wayner William E.
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