초록 ▼

A defrost control system is provided for initiating one or more (defrost) timing cycles each at a different time and for terminating the cycles at the end of their respective predetermined (defrost) periods. The unit generally includes a solid-state, microprocessor based, programmable twenty-four ho

A defrost control system is provided for initiating one or more (defrost) timing cycles each at a different time and for terminating the cycles at the end of their respective predetermined (defrost) periods. The unit generally includes a solid-state, microprocessor based, programmable twenty-four hour timer, and a display panel. The system also includes a proportional defrost module which measures the absolute humidity of the atmosphere and adjusts the defrost initiate time(s) in accordance therewith.

대표청구항 ▼

Apparatus for controlling defrost means in at least one refrigeration unit, comprising; means for effecting actuation of the defrost means at a defrost initate time; means responsive to a determined absolute humidity parameter for controlling the defrost initate time; and said means responsive to th

Apparatus for controlling defrost means in at least one refrigeration unit, comprising; means for effecting actuation of the defrost means at a defrost initate time; means responsive to a determined absolute humidity parameter for controlling the defrost initate time; and said means responsive to the absolute humidity including a temperature sensor for measuring an ambient temperature and for providing a first signal indicative of the measured temperature, and having a relative humidity sensor for measuring a relative humidity condition and for providing a second signal indicative of the measured relative humidity, and having a signal processing means responsive to said first and second signals for deriving a third signal having a frequency which varies in proportion with change in the absolute humidity.