Electronic defrost controller with fan delay and drip time modes

Details Electronic defrost controller with fan delay and drip time modes Electronic defrost controller with fan delay and drip time modes

1994-02-08

1996-01-02

Tanner, Harry B.

Refrigeration

Automatic control

Preventing, removing or handling atmospheric condensate

62156, 62158, 62182, 62234, F25D 2108

Patent

active

054797853

ABSTRACT:
An apparatus controls an appliance, the appliance including a compressor, a fan, and a heater. The apparatus includes a first switch for selectively coupling a first terminal with one of a second terminal and a third terminal in response to a first control signal. The first terminal is coupled with an energy source and the third terminal is coupled with the compressor. The apparatus further includes a second switch for selectively coupling the second terminal with the heater and the third terminal with the fan in response to a second control signal. The apparatus still further includes a control circuit coupled with the first switch and the second switch for generating the first control signal and the second control signal. A relay drive circuit couples relay coils in series to control the first switch, the second switch, and the third switch. A bypass switch allows a single current to selectively energize one or both relay coils.

REFERENCES:
patent: 2492970 (1950-01-01), Curry
patent: 2953908 (1960-09-01), Petrone et al.
patent: 4663941 (1987-05-01), Janke
patent: 4843831 (1989-07-01), Yamada
patent: 4843833 (1989-07-01), Polkinghorne
patent: 4951473 (1990-08-01), Levine et al.
patent: 4993233 (1991-02-01), Borton et al.
patent: 5161383 (1992-11-01), Hanson et al.
patent: 5231844 (1993-08-01), Park
patent: 5237830 (1993-08-01), Grant

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