Manual
EKC 315A Industrial Evaporator Controller
© Danfoss USCO (HMR_MKS), 04-2008
USCO.PD.RD0.A1.22 /521U0092
3
Introduction
The EKC 315A controller can be applied where there is a need for
accurate control of superheat and temperature in refrigeration
systems, for example:
• Air coolers
• Process water chillers
• Air conditioning systems
Advantages
The evaporator is optimally charged, even when there are great
•
variations in load and suction pressure.
Energy savings -- adaptive regulation of refrigerant injection
•
ensures optimum utilization of the evaporator, resulting in a
higher suction pressure.
Using adaptive control, superheat is maintained at the minimum
•
stable level -- an energy-efficient way to optimize the evaporator
while at the same time, media temperature is thermostatically
controlled
Valve Compatibility
The EKC 315A can control evaporator superheat by means of one
pressure transmitter and one temperature sensor using either an ICM
motorized modulating valve with ICAD motor actuator or an AKV or
AKVA pulse-width-modulating expansion valve.
In systems where there is one evaporator, one compressor, and one
condenser, and a relatively small refrigerant charge, the type ICM
valve is recommended.
In systems with an AKV/A valve, the capacity can be distributed
by using up to three valves in parallel. When using more than one
AKV/A per evaporator, an EKC 347 controller is required for each
additional AKV/A in the master-slave configuration. The controller
will generate pulses to the multiple valves in such a way that they
will not be pulsed simultaneously.
Features and Functions
Superheat regulation
•
Temperature control via thermostat function
•
MOP function (limits valve opening degree as long as evaporating
•
pressure is higher than user-set value)
ON-OFF input for start-stop of regulation
•
Input signal that can offset the superheat reference or the
•
temperature reference.
Capable of generating alarms if user-set limits are exceeded
•
Relay output for solenoid valve control
•
PID regulation
•
Analog output to either (a) control an ICM motorized valve; or (b)
•
to monitor superheat, valve opening degree of an AKVA, or air
temperature.
Operation
Type
Function
Code No.
EKC 315A
Industrial evaporator controller
084B7086
Ordering
Superheat control with thermostat function
The superheat is controlled by pressure transmitter P and
temperature sensor S2. The temperature is controlled by the
solenoid valve, the thermostat setting, and the temperature
sensor S3 in the return air.
