Danfoss EKC 315A - Operation Modes; Superheat Control; MOP and Override Functions; Valve Operation and Output

User Guide | Superheat controller, EKC 315A
© Danfoss | DCS (ADAP-KOOL®) | 2015-03
DKRCI.PS.RP0.D2.02 | 520H7653| 3
Operation
Superheat function
You may choose between two kinds of superheat, either:
• Adaptive superheat or
• Load-dened superheat
MOP
The MOP function limits the valve’s opening degree as long as the
evaporating pressure is higher than the set MOP value.
Override function
Via the analog input a displacement can be made of the tempera-
ture reference or of the superheat reference. The signal can either
be a 0-20 mA signal or a 4-20 mA signal. The reference can be
displaced in positive or negative direction.
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.
Relays
The relay for the solenoid valve will operate when refrigeration is
required. 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.
Modulating/pulsating expansion valve
In 1:1 systems (one evaporator, one compressor and one condens-
er) with small refrigerant charge ICM is recommended.
In a system with an AKV valve the capacity can be distributed by
up to three valves if slave modules are mounted. The controller
will displace the opening time of the AKV valves, so that they will
not pulsate at the same time.
Used as slave module is a controller of the type EKC 347.
Analog output
The controller is provided with an analog current output which
can be set to either 0-20 mA or 4-20 mA. The signal will either fol-
low the superheat, opening degree of the valve or the air tem-
perature.
When an ICM valve is in use, the signal is used for control of the
valve via the ICAD actuator.
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.