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Superheat = actual suction line temperature − saturation temperature (from suction pressure for that refrigerant). It indicates how completely the refrigerant boiled off in the evaporator and helps protect the compressor from liquid floodback. Why it matters: • Too LOW superheat → risk of liquid entering compressor (floodback) • Too HIGH superheat → evaporator starved → reduced capacity, coil warmer than ideal Where it’s measured: • Pressure at evaporator outlet / suction (to find Tsat) • Temperature on suction line near evaporator outlet (for actual temp)
Worked example (calculation): Suction pressure corresponds to Tsat 38°F. Suction line temp = 52°F. Superheat = 52 − 38 = 14°F.
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