Very high superheat value

[crash11]

I'm seeing superheat around 60 and subcool around 18. This is a 4 ton water-air unit, and according to my unit's charts the high side pressure is low in all modes but especially during heating. Am I looking at low charge or bad TXV or both?

[gravity]

could be a measurement error. try adjusting the txv valve counter clockwise to decrease your superheat, then recheck both SC and SH

[pfeifer]

what freeon is it it does sound like txv issue but u will need to make sure that heat transfer in evap is ok or the reading u r taking will not b accurate