Which of the following statements describes the accepted method for testing a thermostatic expansion valve?

Correct Answer: Option B — Place the sensing bulb in ice water and then warm by hand. Observe flood-through and temperature change at the suction line.

Placing the thermostatic expansion valve sensing bulb in ice water establishes a known reference temperature, while warming it by hand increases bulb pressure. Observing smooth valve opening, temperature response, and suction line flood-through verifies the proper charge and mechanical integrity of the power head.