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, which statement is true?

Correct Answer: Option A — 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

Proper thermal expansion valve sensing bulb installation on a horizontal suction line requires the pinched-off end pointing downward and the capillary tube upward. This prevents vapor pockets or oil migration from interfering with the internal bulb pressure charge, ensuring accurate evaporator superheat response.