Illinois Tool Works Inc.
REFRIGERATED DEVICE WITH DOOR OPEN SENSOR FAULT IDENTIFICATION

Abstract:

A refrigerated device includes a compartment including an access door. A refrigeration circuit for cooling the compartment includes an evaporator coil with an associated evaporator fan and a condenser with an associated condenser fan. A temperature sensor is provided for indicating a compartment temperature within the compartment. A controller is configured to: (i) monitor the compartment temperature in order to approximate a number of door openings, (ii) compare the approximated number of door openings to a data point and (iii) take a control action based upon a certain result of the comparison.