Refrigeration unit controls
AssigneeCarrier Corporation
InventorRichard G. Lord
Life of this patent
Estimating the term…
Abstract
A field test circuit for an electronic control of a refrigeration unit. The test circuit has a field installed test panel with a control switch and a readout device for indicating that portion of the electronic control to be tested. A microprocessor is provided with a logic program that provides coded information regarding the stage of capacity of the refrigeration unit, the operational status of the unit, diagnostic information of the unit, and a test procedure for testing all inputs and outputs of the microprocessor.
Claims4
A method of testing the electronic controls of a refrigeration unit from a built in field test panel having a digital display, a digital display control switch, a plurality of condition sensor means, and a test logic circuitry having a preprogrammed procedure comprising the steps of:
- electrically connecting output signals of the plurality of condition sensor means to the inputs of a microprocessor control;
- generating a series of test signals from the preprogrammed procedure of the test logic circuitry of the microprocessor;
- operating the digital display control switch to sequentially advance said series of test signals;
- and
- displaying the series of test signals on the digital display as the digital display control switch is operated.
Dependencies are inferred from the claim text.