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Superheat & Subcooling Calculator

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Input Parameters

Unit System

Results

Superheat & Subcooling

-18
Superheat °F
-25
Subcooling °F
63
Suction Sat. Temp °F
95
Discharge Sat. Temp °F

Status: Low Superheat / Low Subcooling

Low superheat indicates overcharge or restricted evaporator airflow. Check evaporator coil and airflow. Low subcooling indicates undercharge. Verify refrigerant charge.

Calculation Steps

1

Determine Suction Saturation Temperature

Formula:
Tsat,suction=f(Psuction,refrigerant)T_{sat,suction} = f(P_{suction}, refrigerant)
Calculation:
Frompressure−temperaturetableforR−410Aat70.0psigFrom pressure-temperature table for R-410A at 70.0 psig
Result:
62.6 °F62.6 \text{ °F}
2

Calculate Superheat

Formula:
Superheat=Tsuction−Tsat,suctionSuperheat = T_{suction} - T_{sat,suction}
Calculation:
Superheat=45.0−62.6Superheat = 45.0 - 62.6
Result:
−17.6 °F-17.6 \text{ °F}
3

Determine Discharge Saturation Temperature

Formula:
Tsat,discharge=f(Pdischarge,refrigerant)T_{sat,discharge} = f(P_{discharge}, refrigerant)
Calculation:
Frompressure−temperaturetableforR−410Aat250.0psigFrom pressure-temperature table for R-410A at 250.0 psig
Result:
95.0 °F95.0 \text{ °F}
4

Calculate Subcooling

Formula:
Subcooling=Tsat,discharge−TdischargeSubcooling = T_{sat,discharge} - T_{discharge}
Calculation:
Subcooling=95.0−120.0Subcooling = 95.0 - 120.0
Result:
−25.0 °F-25.0 \text{ °F}