EVD evolution twin is a controller featuring two drivers for double pole stepper motors that independently manages two electronic expansion valves.
It is designed for DIN rail assembly and is fitted with plug-in screw terminals. Each driver controls refrigerant superheat and optimises the efficiency of the refrigerant circuit, guaranteeing maximum flexibility, being compatible with various types of refrigerants and valves, in applications with chillers, air-conditioners and refrigerators, the latter including subcritical and transcritical CO2 systems.
It features low superheat (LowSH), high evaporation pressure (MOP), and low evaporation pressure (LOP) protection, and can manage, as an alternative to superheat control, special functions such as the hot gas bypass, evaporator pressure regulation (EPR) and control of the valve downstream of the gas cooler in transcritical CO2 circuits.
The controller can drive an electronic expansion valve in a refrigerant circuit with Digital Scroll compressor, if integrated with a specific CAREL controller via LAN. In addition, it features adaptive control that can evaluate the effectiveness of superheat control and if necessary activate one or more tuning procedures.