Refrigeration – With indicator or tester – Condition sensing
Reexamination Certificate
2008-12-03
2010-12-07
Norman, Marc E (Department: 3744)
Refrigeration
With indicator or tester
Condition sensing
C062S217000, C062S225000
Reexamination Certificate
active
07845179
ABSTRACT:
A system includes a compressor temperature sensor that generates a compressor discharge temperature signal corresponding to a compressor of a refrigeration system, a compressor pressure sensor that generates a compressor discharge pressure signal corresponding to the compressor, and a controller processing the signals over a predetermined time period. The processing includes calculating a discharge saturation temperature based on the compressor discharge pressure signal, calculating compressor superheat data based on the compressor discharge temperature signal and the discharge saturation temperature, accumulating the compressor superheat data over the predetermined time period, and comparing the accumulated compressor superheat data to a predetermined threshold. The controller generates an alarm indicating a compressor fault based on the comparing.
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Matthews Thomas J.
Singh Abtar
Woodworth Stephen T.
Emerson Retail Services Inc.
Harness & Dickey & Pierce P.L.C.
Norman Marc E
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