UNIVERSAL EXPANSION VALVE DRIVER EVD000E21

Description

The EVD0000E21 is a universal electronic expansion valve controller designed to regulate refrigerant flow by precisely controlling superheat in cooling and heating systems. It belongs to the CAREL EVD Evolution series and communicates via RS485/Modbus, making it suitable for integration with BMS systems, chillers, and refrigeration controllers.

This driver works with bipolar stepper motor expansion valves and continuously adjusts valve position based on temperature and pressure inputs to optimise system efficiency, protect the compressor, and maintain stable evaporator performance.

Key Features

• Universal electronic expansion valve driver (EEV controller)
• Controls superheat in refrigeration and HVAC systems
• Compatible with multiple valve brands (universal stepper motor support)
• RS485 / Modbus communication interface
• Advanced PID-based superheat regulation
• Supports low superheat, MOP (Max Operating Pressure), and LOP protection
• DIN rail mounting design
• Plug-in screw terminal connections for easy installation
• Works with pressure transducer + temperature sensor inputs
• Adaptive control for energy-efficient operation
• Suitable for chillers, cold rooms, display cases, and HVAC units
• High precision valve positioning control for stable system performance

Specifications

• Product Type: Electronic Expansion Valve Driver
• Model: EVD0000E21 (EVD000E21 commonly referenced)
• Manufacturer: CAREL
• Valve Type: Bipolar stepper motor electronic expansion valve
• Control Function: Superheat regulation (PID / adaptive control)
• Communication: RS485 / Modbus
• Power Supply: 24 VAC / 24 VDC (typical)
• Inputs: Pressure transducer + NTC temperature sensors (configurable)
• Outputs: Stepper motor drive signal for EEV
• Mounting Type: DIN rail
• Application: Refrigeration systems, chillers, cold rooms, HVAC systems, industrial cooling plants
• Protection Functions: Low superheat, high pressure (MOP), low pressure (LOP), compressor protection logic