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I went on a job earlier today new 2 1/2 ton r-410a system w/txv, it was undercharged, I found refrigerant leak at filter drier, repaired leak, evacuated to 500 microns etc,added refrigerant, charged to 12f subcool, problem is that my temperature split is to low, 14f (75f/61f)I checked my superheat 26f, line temp 61f ,saturation temp 35f. Am I missing something? Or should I go back and try adjusting txv? Thanks Paul s