Refrigerant Superheat / Subcooling (psig-psia toggle)
Saturation T from bundled P-T tables (R-410A / R-32 / R-454B / R-22 / R-134a); per-input psig vs psia toggle; in-range / low / high flags.
Formula and source
Saturation T from bundled manufacturer P-T table by linear interpolation. Superheat = T_suction_line − T_sat(P_suction); Subcool = T_sat(P_liquid) − T_liquid_line. Each pressure input has a psig/psia toggle (psig is gauge default; psia adds 14.696 to psig).
Manufacturer-attributed P-T tables (DuPont, Honeywell Solstice, Chemours Opteon, Arkema Forane) by name; ASHRAE 34 safety classifications by name.
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