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

Question

Accepted Answer

Place the sensing bulb in ice water and then warm by hand. Observe flood-through and temperature change at the suction line.

Answer

Heat the bulb by using a halide torch or similar device and observe the valve stem movement.

Answer

Remove the power head from the unit, heat the bulb with a torch while using a scale to measure the distance the diaphragm has moved.

Answer

Chill the bulb in ice water while observing the compressor for an increase in suction pressure.

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