Title: Refrigeration system control method and apparatus

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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Inventors: Gardner, Edward B. (Bloomfield, CT, US)

Application Number: 928961
Filing Date: 1978-07-28
Publication_date: 1980-06-10
Assignee: Emhart Industries, Inc. (Farmington, CT)
Primary Class(es): 62/128 62/234, 165/232, 340/309.4
Other Classes:
US Patent Ref:

2118636	May, 1938	Alexander et al.
3120652	Feb, 1964	Weighton et al.	324/73.
3474638	Oct, 1969	Dodge	62/153.
3498073	Mar, 1970	Kusuda et al.	62/155.
3876868	Apr, 1975	Cramwinchel et al.	340/147.
3894404	Apr, 1975	Stanton	62/155.
3946573	Mar, 1976	Nichols et al.	62/126.
3976893	Aug, 1976	Banfi	324/73.
3978322	Aug, 1976	Dobkin.

Other Refs:
Primary Examiner: Wayner, William E.
Assistant Examiner:
Attorney: McCormick, Paulding & Huber