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Originally Posted by nike123

• LOW CHARGE = High superheat. Low suction pressure, indoor TD, subcooling, head pressure & compressor current draw.
• OVER CHARGE = Low superheat. Normal indoor TD. High suction pressure, subcooling, head pressure & compressor current draw.
• LOW INDOOR AIR FLOW = Low superheat & suction pressure. Low to normal head pressure. High indoor TD. High to normal subcooling. Not much effect on current draw.
• MILD LOW OUTDOOR AIR FLOW = Low superheat & subcooling. High suction

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Originally Posted by nike123

http://www.freeinfostuff.com/TorqueE...eExtension.htm

Originally Posted by nike123

http://docs.lib.purdue.edu/cgi/viewc...&context=iracc

Here is nice explanation: