ECD-002, EX4-EX8 Stepper Motor Driven ValvesWhite Rodgers 097712 EC3 D72, EC3 X32, ECD X33 Electronic Expansion Valve Superheat Controller Display Keyboard for Valve Set Up Features: Front panel mounted interface for parameter and status read out and for controller setup via keypad Indicator LEDs for valve opening closing, demand and alarm Superheat or temperature control in conjunction with stepper motor and motor driven electrical valves Monitoring of sensor and sensor wiring Alarm management