Correct Placement of the Thermostatic Expansion Valve Sensing Bulb
The location of the expansion valve sensing bulb directly affects superheat control, refrigerant feeding to the evaporator, and refrigeration system stability. Even when the valve is correctly selected, improper bulb installation can cause it to sense an unrepresentative temperature and regulate refrigerant flow incorrectly. This guide applies to thermostatic expansion valves. Sensor placement for electronic expansion valves must follow the instructions for the specific system.
