Specifications

122 RK0YG302 © Danfoss 05/2007
EKC 312
Water chiller control
Application
The controller and valve can be used where there are
requirements to accurate control of superheat in connection with
refrigeration.
E.g.:
• Processing plant (water chillers)
• Cold store (air coolers)
• A/C plant
Advantages
• The evaporator is charged optimally – even when there are
great variations of load and suction pressure.
• Energy savings – the adaptive regulation of the refrigerant
injection ensures optimum utilisation of the evaporator and
hence a high suction pressure.
• The superheating is regulated to the lowest possible value.
Functions
• Regulation of superheat
• MOP function
• ON/OFF input for start/stop of regulation
• PID regulation
System
The superheat in the evaporator is controlled by one pressure
transmitter P and one temperature sensor S2.
The expansion valve is with step motor of the type ETS.
For safety reasons the liquid ow to the evaporator must be cut
o if there is power failure for the controller. As the ETS valve is
provided with step motor, it will remain open in such a situation.
EKC 312