HVAC/R system Uni-Polar Electronic Expansion Valve superheat Controller (EEV Controller) China

It is a controller for single pole stepper motor which manages one electronic expansion valve. It is designed for DIN rail assembly and is fitted with removable screw terminals. EVDCool controls refrigerant superheat and optimizes the efficiency of the refrigerant circuit, guaranteeing maximum flexibility, being compatible with various types of refrigerants and valves . 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 UX* controller via Modbus RTU.

As regards network connectivity, the controller can be connected to either of the following:
-a UX* controller via RS485/Modbus;
-a supervisor or IOT platform via RS485/Modbus.
In this case, On/Off control is performed via digital input 1, if suitably configured. As well as regulation start/stop, digital inputs 1 and 2 can be configured for the following:
- valve regulation optimization after defrosts;
- valve forced open (at 100%);
- regulation backup;
- regulation security.
Another possibility involves operation as a simple positioner with 4 to 20 mA or 0 to 10 Vdc analogue input signal.
EVDCool has one build-in LED display and one keypad with four keys, so that the user can change/configure parameters easily. normally, the user just needs 4 parameters to start basic regulation:

• refrigerant

• Valve

• Pressure sensor

• main regulation

• Main Features




• electrical connections by removable screw terminals;

• RS485 bus with standard Modbus RTU;

• compatibility with various brand of valves;

• superheat control with protection functions for low superheat LowSH,MOP, LOP;

• build-in LED display and keypad, easy to check/change/config parameters;

• parameters protected with password;

• supports both 0.5V~4.5V and 4~20 mA pressure transducer;

• supports both NTC and PT1000 temperature probes

• 4~20 mA or 0~10 Vdc input to use the controller as a positioner controlled by an external signal;

• management of power failures with valve closing (both 24Vac and 24Vdc);

• pre-position time settable by parameter;

• 4 to 20 mA pressure transducer can be shared between up to 5 drivers;