Specifications

90 RK0YG302 © Danfoss 05/2007
Evaporator controls and electrically operated expansion valves
Since the introduction of the AKV pulse-width modulated
electronic expansion valve has contributed to energy savings
in the supermarket refrigeration systems, and is continuously
under development to ensure further eciency. Investment
into intelligent and adaptive controls brings lower energy
consumption and also lower running costs of the supermarket
refrigeration systems.
In order to achieve ecient and optimal liquid injection,
installation of an electronic expansion valve and controller with
adaptive control of the superheat is required. Adaptive automatic
refrigeration control system is possible as no manual setting is
required, and the system itself nds the optimal superheat level
according to current operating conditions.
The electronic expansion valve is also a precondition for further
optimisation of the refrigeration installation because not only
does it provide accurate control, but it also transmits valuable
information about the load and performance of the refrigeration
system.
The AKV pulse-width modulated electronic expansion valve
together with the corresponding evaporator controller and other
ADAP-KOOL® controllers make energy savings even higher by
ensuring suction and condensing pressure optimisation.
ADAP-KOOL® evaporator controls enable optimal functionality of
refrigeration system, and, at the same time, save energy and keep
food quality in display cases and cold rooms thanks to features like
defrost function, adaptive superheat control with AKV electronic
expansion valve and others.
Among the controls there are three dierent families of controllers
with the following features:
1) EKC 414/ EKC 514
series are dedicated evaporator controllers
that can control one evaporator in a display case or cold room.
It controls temperature, fan, compressor, defrost, lighting and
rail heat or alarm. Advanced control features like adaptive
superheat control with AKV electronic expansion valve,
adaptive suction pressure control, modulating temperature
control and defrost co-ordination of this controller help to
achieve energy savings and keeping food quality.
2) AKC 1xx series are evaporator controls for refrigeration
appliances and small cold rooms where the system consists of
controller, up to 3 valves and sensors. The system, on the whole,
replaces all other automatic controls, as it contains an injection
function for optimum utilisation of evaporators, day and night
thermostats, defrost function, fan control, rail heat control, light
control, alarm function, and so on.
AKC controllers have built-in DANBUSS data communication.
3) AK-CC 550
is for controlling an evaporator. It is extremely
exible and can be used for dierent types of refrigeration
appliances.
A software setting is used to dene one of 10 possible appli-
cations, where the function and the connection points are
specied.
4) AK-CC 750 is a modular evaporator controller that can be used
for case or cold room applications up to 4 evaporators in a case
line-up or a room. AK-CC 750 comprises wide range of energy
savings features like intelligent fault detection and diagnosis.
This controller features a new intelligent defrost functionality.
By using the AKV valve as refrigerant mass ow meter, the
controller can monitor the ice formation on the evaporator.
When the normal defrost schedule cannot cope with extra
load conditions the controller will automatically add an extra
defrost and thereby avoid expensive service calls to iced up
evaporators.
Introduction