Target Superheat (R-22, Fixed Orifice)
Notes
Formula: Target SH = ((3 × WB) − 80 − ODT) / 2. Result is clamped to 5–30°F for field sanity.
Use °F inputs. Always defer to the unit’s OEM charging chart when available.
R-22 Superheat — Measured & Target
Measured (use psig & °F)
Target (fixed orifice)
Notes
Target SH formula (fixed orifice): ((3 × WB) − 80 − ODT) / 2, then clamp to 5–30°F for field sanity.
Measured SH: Line Temp − Sat Temp@Suction Pressure (dew). Always defer to the unit’s OEM chart when available.
Fixed-Orifice (Piston) Size Finder
Tips
• Try both indoor and outdoor model numbers; piston is determined by the exact matched pair (AHRI).
• Look in docs for sections named Piston Kit Chart, Orifice Size, Metering Device, or Indoor Piston.
• If OEM search shows nothing, click the Broad Web or Dashless links—some PDFs omit dashes.
• Look in docs for sections named Piston Kit Chart, Orifice Size, Metering Device, or Indoor Piston.
• If OEM search shows nothing, click the Broad Web or Dashless links—some PDFs omit dashes.