Specifications

114 RK0YG302 © Danfoss 05/2007
AK-CC 750
AK-CC 750
Application
AK-CC 750 controllers are complete regulating units which
together with valves and sensors constitute complete evaporator
controls for refrigeration appliances and freezing rooms within
commercial refrigeration.
Generally speaking they replace all other automatic controls
containing, inter alia, day and night thermostats, defrost, fan con-
trol, rail heat control, alarm functions, light control, thermo valve
control, solenoid valve, etc.
The controller is equipped with data communication and is ope-
rated via a PC.
In addition to evaporator control the controller can give signals
to other controllers about the operating condition, e.g. forced
closing of expansion valves, alarm signals and alarm messages.
Advantages
• Control of up to 4 evaporator sections
• Adaptive superheat control ensures optimum evaporator usage
in all operational circumstances.
• Electronic injection with AKV valve
• ON/OFF or modulating temperature control
• Weighted thermostat and alarm thermostat
• Defrost on demand based on evaporator capacity
• Appliance cleaning function
• Light control using door switch or network signal depending on
day/night operation
• Rail heat pulsing depending on day/night operation.
• Monitoring of door alarm and control of light/refrigeration
depending on location of door switch.
• Log function for registration of historical parameter values and
alarm modes.
Control
The controller’s main function is to control the evaporator so that
the system constantly operates with the most energy-friendly
refrigeration.
A specic function for registration of the need for defrost will
adapt the number of defrosts so that no energy is wasted on un-
necessary defrosts and subsequent cooling-down cycles.
Adaptive defrosting
AK-CC 750 is equipped with an adaptive defrosting function. By
using an AKV valve as mass ow sensor for the supply of refriger-
ant the control can monitor ice formation on the evaporator. If
the usual defrosting programme cannot handle a larger load, the
control initiates further automatic defrosting which means that
expensive service visits due to iced-up evaporators are avoided.
Evaporator control of one, two, three or four evaporators
Control of cool or defrost
room
Control of cool or defrost
appliance