Saturday, July 19, 2008

Superheat Control with EC3-X Controllers

The EC3-X controllers, together with the electrical control valves EX4, EX5, EX6, EX7 and EX8 take care of stable superheat control.
The pressure and the temperature of the refrigerant at the evaporator outlet are used as input signals. The controller calculates the opening of the electrical control valve [ECV] and generates the signal to drive the stepper motor. In the case of power loss, the electrical control valve is closed to protect the compressor from being flooded. To do this, a rechargeable Lead-Gel battery is built into the controller. An additional solenoid valve is no longer necessary. The refrigerant request signak us fed into the EC3-X controller through a digital input. This input is also used for temperature control and valve control.

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