Question 41Refrigeration & AC - QMED

The correct answer is D) Place the sensing bulb in ice water and then warm by hand. Observe flood-through and temperature change at the suction line. This is the accepted method for testing a thermostatic expansion valve because it allows you to observe the valve's response to changes in temperature. By chilling the bulb in ice water and then warming it by hand, you can see the valve stem move and monitor the corresponding changes in suction pressure and temperature, which confirms the proper operation of the valve. The other options are incorrect because they do not accurately test the valve's response to temperature changes. Option A would only show the compressor's reaction, not the valve's. Option B requires removing the power head, which is not the standard testing procedure. Option C uses a heat source that could potentially damage the valve.