The SPTP fields are also mathematically derived, yes? When you make the Suction Pressure fields selectable then tab away, the SpTp formula math field will populate.
Am I tracking with you correctly?
There is a correlation between a refrigerant pressure and temperature so the SPTP field is a lookup of the temp associated to a pressure state.
Thanks for those that are taking a look at this...I had someone push me in the right direction and it is working now...select the pressure, the SpTp temp is populated, enter the STemp and the SupHt is calculation