Danfoss EKC 202D User Manual

4 Manual RS8EE202 © Danfoss 08-2010 EKC 202D
Digital inputs
There are two digital inputs both of which can be used for one of
the following functions:
- Case cleaning
- Door contact function with alarm
- Starting a defrost
- Coordinated defrost
- Change-over between two temperature references
- Retransmission of a contact’s position via data communication
Case cleaning function
This function makes it easy to steer the refrigeration appliance
through a cleaning phase. Via three pushes on a switch you
change from one phase to the next phase.
The rst push stops the refrigeration – the fans keep working
”Later”: The next push stops the fans
”Still later”: The nal push restarts refrigeration
The dierent situations can be monitored on the display.
On the network a cleaning alarm is transmitted to the system unit.
This alarm can be ”logged” so that proof of the sequence of events
is provided.
Door contact function
In cold rooms and frost rooms the door switch can turn the light
on and o, start and stop the refrigeration and give alarm if the
door has remained open for too long.
Defrost
Depending on the application you may choose between the
following defrost methods:
Natural: Here the fans are kept operating during the defrost
Electric: The heating element is activated
Brine: The valve is kept open so that the brine can ow
through the evaporator
Start of defrost
A defrost can be started in dierent ways;
Interval: Defrost is started at xed time intervals, e.g., every
eight hour
Refrigeration time:
Defrost is started at xed refrigeration time inter-
vals, in other words, a low need for
refrigeration will ”postpone” the coming defrost
Schedule: Here defrost can be started at xed times during
the day and night. However, max. 6 times
Contact: Defrost is started with a contact signal on a digital
input
Network: The signal for defrost is received from a system unit
via the data communication
S5 temp In 1:1 systems the eciency of the evaporator can
be monitored. Icing-up will start a defrost.
Manual: An extra defrost can be activated from the control-
ler’s lower-most button
All the mentioned methods can be used at random – if just one of
them is activated a defrost will be started.
- + + °C
1 ÷ + Fan
2 ÷ ÷ O
3 + + °C

Danfoss EKC 202D Specifications

General

Brand	Danfoss
Model	EKC 202D
Category	Controller
Language	English