Concerning the proper installation of the sensing bulb of a thermal expansion valve that is attached to the evaporator tail coil on a horizontal run, what statement is true?

Correct Answer: Option D — the bulb should be attached so that the pinched off tubing should be oriented down and the capillary tube running to the valve diaphragm should be oriented up

Mounting the sensing bulb with the pinched-off tubing oriented downward and the capillary tube running upward prevents vapor pockets or non-condensables from collecting near the sensing point, ensuring true liquid-vapor interface contact and accurate bulb temperature transmission.