Danfoss EKC 312 User guide
User manual
Electronic superheat controller
Type EKC 312
The controller and valve can be used where
there are requirements to accurate control of
superheat in connection with refrigeration.
• Processing plant (water chillers)
• Cold store (air coolers)
• A/C plant
Features 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.
DKRCC.PS.R1.A3.02 / 520H9752
y The superheating is regulated to the lowest
possible value.
Manual Electronic superheat controller, type EKC 312
Introduction
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.
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.
2 DKRCC.PS.R1.A3.02 / 520H9752 © Danfoss A/S (DCS-IMCGPD/sw), 2015-03
Manual Electronic superheat controller, type EKC 312
Operation
Superheat function
y Adaptive superheat
MOP
The MOP function limits the valve’s opening degree as long as the
evaporating pressure is higher than the set MOP value.
External start/stop of regulation
The controller can be started and stopped externally via a contact
function connected to input terminals 1 and 2. Regulation is
stopped when the connection is interrupted. The function must be
used when the compressor is stopped. The controller then closes
the solenoid valve so that the evaporator is not charged with
refrigerant.
Alarm relay
The relay for the alarm function works in such a way that the
contact is cut in in alarm situations and when the controller is
de-energised.
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.
© Danfoss A/S (DCS-IMCGPD/sw), 2015-03 DKRCC.PS.R1.A3.02 / 520H9752 3
Manual Electronic superheat controller, type EKC 312
Data
24 V AC +/-15% 50/60 Hz, 10 V A
Supply voltage
Power consumption
Input signal
Sensor input 2 pcs. Pt1000 ohm
Alarm relay 1 pcs. SPST
Step motor output Pulsating 100 mA
Data communication
Ambient
temperature
Enclosure IP 20
Weight 300 g
Mounting DIN rail
Display LED, 3 digits
Approvals
(the supply voltage is galvanically separated from the input and output signals)
Controller
ETS step motor
5 V A
1,3 V A
Press. transmitter 4-20 mA from AKS 33
Digital input from external contact func-
tion
AC-1: 4 A (ohmic)
AC-15: 3 A (inductive)
Possible to connect a data
communication module
-10 – 55 °C, During operation
-40 – 70 °C, During transport
20 – 80% Rh, not condensed
No shock influence/vibrations
EU Low Voltage Directive and EMC
demands re CE-marking complied with.
LVD-tested acc. to EN 60730-1
and EN 60730-2-9
EMC-tested acc. to EN50081-1
and EN 50082-2
Ordering
Typ e Function Code No.
EKC 312 Superheat controller 084B7250
EKA 173
EKA 175
EKA 174
Temperature sensor Pt 1000 ohm / Pressure transmitter type AKS 33: Kindly refer to catalogue
RK0YG ETS valves: Kindly refer to data sheet RD1TA
Data communication module (accessories),
(FTT 10 module)
Data communication module (accessories),
(RS 485 module)
Data communication module (accessories),
(RS 485 module) with galvanic separation
084B7092
084B8679
084B7124
Connections
Necessary connections
Terminals:
25-26 Supply voltage 24 V AC.
21-24 Supply to step motor
18-19 Pt1000 sensor at evaporator outlet (S2)
14-15 Pressure transmitter type AKS 33
1-2 Switch function for start/stop of regulation. If a switch is
not connected, terminals 1 and 2 must be shortcircuited.
Application dependent connections
Terminal:
18-20 Pt1000 sensor for measuring air temperature (S4)
12-13 Alarm relay
There is connection between 12 and 13 in alarm situa tions
and when the controller is dead
3-4 Data communication
Mount only, if a data communication module has been
mounted.
It is important that the installation of the data communication cable be done correctly. Cf. separate literature No.
RC8AC...
Data communication
< --------------- max. 5 m --------------->
4 DKRCC.PS.R1.A3.02 / 520H9752 © Danfoss A/S (DCS-IMCGPD/sw), 2015-03
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