SC Refrigeration Practice Questions - South Carolina Refrigeration Contractor Examination Exam

Compared with a mechanical TXV, an electronic expansion valve (EEV) typically:

Cannot control superheat and is used only as a liquid-line shutoff Uses a controller and sensor (often a pressure transducer plus thermistor) to drive a stepper motor for tighter superheat control and easier low-load or pull-down operation Is adjusted only by turning a stem on the valve body with no electronics Must be installed without a strainer because debris cannot affect it

Correct Answer:

Uses a controller and sensor (often a pressure transducer plus thermistor) to drive a stepper motor for tighter superheat control and easier low-load or pull-down operation

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