Demand defrost time clock control circuit

Details Demand defrost time clock control circuit Demand defrost time clock control circuit

1977-09-16

1979-03-06

Braun, Leslie

Refrigeration

Automatic control

Preventing, removing or handling atmospheric condensate

62234, F25D 2106, F25D 2100

Patent

active

041423747

ABSTRACT:
A method and apparatus for initiating the defrost of refrigeration equipment on demand. A defrost clock which normally controls the conventional refrigeration and defrost modes of a refrigeration system includes an auxiliary switch to cease operation of the clock motor a predetermined time prior to normal defrost initiation. The defrost clock thus remains in the refrigeration mode until the demand defrost sensor switch, or an optional demand switch, initiates a defrost cycle of the refrigeration equipment. The closure of the demand defrost switch or the optional switches causes the defrost clock motor to run for a predetermined short period of time. The defrost clock switch subsequently closes slightly prior to initiation of a defrost to guarantee that the clock runs throughout the defrost mode. Thereafter, the defrost clock controls the length of the defrost and will terminate defrost upon a signal from a thermostat, or by a time signal, or a pressure signal. The auxiliary switch remains closed after termination to allow the defrost clock to repeat the previous sequence of operation.

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