Danfoss EKC 326A User Manual page 3

Receiver control
The receiver pressure can be controlled so that it is kept at a set
reference point. This control requires the installation of an ETS
valve a (CCM valve) and a pressure transmitter.
If only monitoring and not control is required, the valve should
not be installed. Install the pressure transmitter only.
Ensuring that the receiver pressure is not too low
A limit value can be set, and if the pressure falls below this value,
the ICMTS valve will be opened. The valve will then open gradually
through the associated P band. Open to the value "n32" ( Vhp OD
Max).
Protecting against high receiver pressure
A limit value can be set, and if the pressure rises beyond this value,
the ICMTS valve will be closed. The valve will then close gradually
through the associated P band.
Extra refrigeration capacity ("extra compressor")
This function improves the system's refrigeration capacity by
increasing the reference pressure in the gas cooler with a offset
value.
It is activated via a switch function.
Heat recovery or heat pump
This function will increase the gas pressure to a set value. This
value will be equivalent to a specific temperature.
The value can either be fixed or can vary in accordance with an
input signal of 0-10 V as follows:
A signal of 1.5 V or above can activate the function and increase
the reference to Pgc HR Min.
If a variable reference is required, then a signal between 2-10 V
can be connected. The signal will increase the reference further.
This function works both in subcritical and transcritical ranges.
Output signal
The controller has a voltage output on 0-10 V. The signal is used to
control the ICMTS valve via the ICAD actuator.
Valves opening degree
The opening degree of both ICMTS and ETS valves (CCM valve)
can be narrowed if necessary.
PC-operation
The controller can be provided with data communication so that it
can be connected to other products in the range of ADAP-KOOL®
refrigeration controls. In this way operation, monitoring and data
collection can be performed from one PC – either on the spot or in
a service company.
Temperature reading
The temperature by the gas cooler must be measured using a Pt
1000 ohm sensor type AKS 21.
The sensor must be mounted immediately next to the gas
cooler outlet to produce a correct signal.
Pressure reading (bar)
The pressure by the gas cooler must be measured using a pressure
transmitter type AKS 2050.
The pressure transmitter must be mounted immediately next
to the gas cooler outlet to produce a correct signal.
Emergency cooling
The valve's average opening degree for the last six hours is
regularly saved. This opening degree is used if there is a need for
emergency cooling.
EKC 326A Manual RS8FM602 © Danfoss 02-2016 3