Cascade HC/HFC - CO2 system
Application guide RA8AB102 © Danfoss 10/2010
7
• 4 compressors with up to 3 un-loaders
• 6 fans
• Max. 60 inputs/outputs
• Variable speed control on lead compressor and
condenser fans
• Build in oil Management functions
• Release-request function for coordination between
high-pressure and low-pressure compressors.
• 8 compressors with up to 3 un-loaders
• 8 fans.
• Max. 100 inputs/outputs.
• For cooling with brine or pumped CO2
• For use with a thermostatic expansion valve.
• Energy optimisation of the whole refrigeration
appliance
• One controller for several different refrigeration
appliances
• Natural, electric or hot gas defrost
• For cooling with Electronic expansion valve
• Adaptive control of superheat
• Adaptive defrosting based on evaporator perform-
ance
• Stepper motor driver for ETS or CCM expansion
valve.
• 0 - 10 V output for ICMTS valves
• Electrically operated expansion valves for precise
liquid injection in evaporators
• Fully balanced, providing bi-flow feature as well as
solenoid tight shut-off function in both flow direc-
tions.
AK-PC 740
Flexible controller for capacity control of
compressors and condenser fans. Number of
I/O can be extended with AK-XM extension
modules.
AK-PC 780
As AK-PC 740 plus:
AK-CC 450
Complete refrigeration appliance control with
great flexibility to adapt to all types of refrigera-
tion appliances and cold storage rooms.
AK-CC 550A
As AK-CC 450 +
AK-CC 750
Flexible refrigeration appliance controller for
control of up to 4 evaporators.
EKC 313
Controller for liquid injection in cascade heat
exchangers with CO2 as refrigerant on the low
temperature circuit.
ETS
ETS is a series of electrically operated (stepper
motor) expansion valve