Refrigeration control system with self-adjusting defrost interva

Details Refrigeration control system with self-adjusting defrost interva Refrigeration control system with self-adjusting defrost interva

1986-03-05

1988-06-14

Tanner, Harry B.

Refrigeration

Processes

Defrosting or frost inhibiting

62155, 62234, F25D 2100

Patent

active

047503327

ABSTRACT:
A refrigeration control system with self-adjusting defrost interval is provided. The system includes an improved control circuit including an external comparator and a microprocessor having a compressor output drive function and a defrost output drive function. The comparator is linked with the microprocessor with circuit elements for detecting the time period of a defrost operation, comparing the time period with predetermined defrost period limits, generating an output control signal in response to a predetermined relationship between the time period and the limits, and adjusting the defrost interval in response to the control signal whereby the defrost operation is maintained within a preferred preselected time period.

REFERENCES:
patent: 4156350 (1979-05-01), Elliott et al.
patent: 4251988 (1981-02-01), Allard et al.
patent: 4299095 (1981-11-01), Cassarino

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