Question 121Refrigeration & AC - Assistant Engineer

The correct answer is B) 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, which is the primary function of the valve. By placing the sensing bulb in ice water and then warming it by hand, you can see how the valve reacts to the temperature change, including monitoring the flood-through and observing the temperature change at the suction line. The other options are incorrect because they do not accurately test the valve's response to temperature changes. Option A involves removing the power head, which is not the standard testing procedure. Option C uses a halide torch, which could potentially damage the valve. Option D focuses on the compressor rather than the valve itself.