Application
The controller and valve can be used where there are
requirements to accurate control of superheat in connection with
refrigeration.
E.g.:
y Processing plant (water chillers)
y Cold store (air coolers)
y A/C plant
Advantages
y The evaporator is charged optimally – even when there are
great variations of load and suction pressure.
y Energy savings – the adaptive regulation of the refrigerant
injection ensures optimum utilisation of the evaporator and
hence a high suction pressure.
y The superheating is regulated to the lowest possible value.
Functions
y Regulation of superheat.
y MOP function.
y ON/OFF input for start/stop of regulation.
y PID regulation.
Introduction
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
OFF 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.
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