Field tools · Calculator

Superheat & Subcooling

Punch in your suction-line and liquid-line readings; ChillFlow resolves SH and SC against the saturation table and flags them against common residential targets. Add indoor wet-bulb / dry-bulb to surface a TXV target and a SC-band suggestion. Discharge-line reading captured for context.

ASHRAE R-410A · A1

Enter your suction-line and liquid-line readings. ChillFlow resolves superheat and subcooling against the saturation table and flags out-of-range targets. Optional indoor wet-bulb / dry-bulb unlock rough TXV-target and subcooling-band hints.

Refrigerant

Temp

Pressure

gauge readings

Superheat (SH)

Measured suction-line temp − saturation temp at suction psig

Suction-line temp (°F)

Suction pressure (psi)

Result

10.2°F

SH within common residential target band (5.0–18.0 °).

Saturation at 131 psi = 39.8 °F.

Subcooling (SC)

Saturation temp at liquid psig − measured liquid-line temp

Liquid-line temp (°F)

Liquid pressure (psi)

Result

10.0°F

SC within common residential target band (8.0–18.0 °).

Saturation at 397 psi = 100.0 °F.

Discharge-line reading

Recorded for context — not used in SH/SC math.

Discharge temp (°F)

Discharge in common range (120.0–220.0 °F).

Ranges shown are the most common residential-A2L/HFC bands. The indoor-air hints are rule-of-thumb targets only — always cross-reference the manufacturer's OEM charging chart and weigh in for final commissioning.