How do i use a temp probe and service gauges to diagnose the gas charge in a coolroom evaporator .
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If my room temp is plus 10 degrese and my thermometer probe in the coil is reading 0 degrees and my service gauges say 125 kpa or minus 27 degrees on R404 then what am i supposed to understand about the system . Is it under charged ?
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If my coolroom is running correctly and the room is at 1 degree then what should my thermometer in the coil read and what should my service gauges read?
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thankyou

Szarn