According to the Sporlan bulletin on PT chart for troubleshooting purposes. Taking superheat to troubleshoot a system with refrigeration related problems, iced coil, warm box with working compressor etc. When is the proper time to take a superheat reading for troubleshooting? Before de-icing a partially iced coil, or a box that is pumping but not cooling properly, partially clogged cap tube, system capacity problems etc. Just s little confused, any help would clear things up a little.

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