Electronic refrigeration control system
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United States of America Patent
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-
May 1, 2001
Grant Date -
N/A
app pub date -
Jul 8, 1999
filing date -
Apr 25, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The present invention is direct to a system and method for electronically controlling the refrigeration and/or heating of the product storage compartment in a vending machine. The system includes a temperature sensor for sensing the temperature in the product storage compartment, and a door sensor for sensing whether the door is open or closed. The control method includes the steps of activating a defrost mode, which is a timed period with no heating or cooling activity, when the door to the vending apparatus is open. The defrost mode is also activated whenever the cooling element has been running continuously for several hours. Further, the control method includes a step of cycling the cooling element 'on' whenever a predetermined high temperature is reached. When the cooling element is 'off' for more than 6 hours and the predetermined high temperature has not been reached, the heater is turned 'on' to prevent the products in the vending machine from freezing.
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