Introduction - Danfoss AK-CC 750A User Manual

Introduction

Application
AK-CC 750A 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 con-
taining, inter alia, day and night thermostats, defrost, fan control,
rail heat control, alarm functions, light control, etc.
The controller is equipped with data communication and is oper-
ated via a PC.
In addition to evaporator control the controller can give signals to
other controllers about the operating condition, e.g. forced clos-
ing of expansion valves, alarm signals and alarm messages..
The controller's main function is to control the evaporator so that
the system constantly operates with the most energy-friendly
refrigeration.
A specific 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.
Among the different functions can briefly be mentioned:
• Control of up to four evaporator sections
• Electronic injection with AKV or stepper valve
• ON/OFF or modulating temperature control
• Weighted thermostat and alarm thermostat
• Defrost on demand based on evaporator capacity
• Appliance cleaning function
• Appliance shutdown via data communication
(The functions may not be mixed across the various sections of
the evaporator.)
The complete survey of controllers and functions can be seen in
the manual chapter 2 in section "Design o a evaporator control".
76 RS8HP102 © Danfoss 2018-09
Examples
The controller has been designed to control one of the following
four plant types.
Through the programming you determine which one.
Evaporator control of one, two, three or four evaporators
(ETS)
Control of cool or defrost room
Control of cool or defrost appliance
• The refrigerant is either regulated by means of:
- expansion valve type AKV/stepper or
- solenoid valve and thermostatic expansion valve
AK-CC 750A