Application; Inject On Function; Digital Input - Danfoss EKC 414A Manual

Introduction

Application

The controller is a complete control unit for refrigeration
appliances with integrated refrigeration-technical functions
capable of replacing a setup of thermostats and timers.
The relays are used for operating:
- Compressor
- Fan
- defrost
- Alarm
- Light
The controller can operate one evaporator.
The intended placing of the controller is "on/near the
refrigeration appliance" and the controller is therefore
provided with plugs at the sensor connection points. All
sensors used must therefore be fitted with a belonging plug.
Operation
The controller comes without operating buttons on the front
panel, and it will require no operation once it has been set
and started up.
When the controller is operated, it can be done in one of the
following ways:
• Connection of an external display with operating buttons
- The display will currently show measurements and settings
in the menu system
- In case of malfunction the relevant error code will be
shown on the display
- Four light-emitting diodes will show the system's actual
function:
› refrigeration
› power for the AKV valve
› defrost
› fan operating
› when there is an alarm the three LED's will flash
• Data communication
The controller can be hooked up with other products in the
series of ADAP-KOOL ® refrigeration controls. The
operation, monitoring and data collection can then be
performed from a PC – either on site or at a service
company.
Customer display
If the temperature in the appliance is to be visible to, say,
customers, a display can be mounted.
2 Manual RS.8C.K3.02 © Danfoss 09-2003

Inject ON function

The expansion valve closes when the signal at the 230V input
is removed or receives a signal via the data communication.
In this way it is ensured that the expansion valve will not
charge the evaporator when the compressor has stopped.
(The threading of the function may be cancelled via a
setting).

Digital input

A digital input can be defined for one of the following applica-
tions:
Door alarm
Defrost start
Night operation
Start/stop of regulation
Joint defrost start/stop with a master/slave function
Data communication
The controller is provided with LON RS 485 data communica-
tion. More about this data communication on page 18.
EKC 414A