Which phenomenon occurs with a thermostatic expansion valve overwhelmed by excessive superheat?

💡 Explanation

With excessive superheat the thermostatic expansion valve opens fully because the sensing bulb detects a rise above the setpoint, flooding the evaporator with superheated vapor and increasing the discharge temperature, potentially damaging the compressor. Therefore compressor overheating occurs, rather than slugging, flooding, or blockage, which involve insufficient superheat or alternate flow restrictions.

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