Danfoss AK-CC55 Multi Coil User Manual

Controller functionality
Functions
• Day/night thermostat with ON/OFF or modulating principle
• Switch between thermostat settings via digital input
• Adaptive control of superheat
• Adaptive liquid control
• Start of defrost via schedule, digital input, network or setting display
• Natural or electric defrost
• Stop of defrost on time and/or temperature
• Coordination of defrosting among several controllers in a line-up
• Pulsing of fans when thermostat is satised
• Appliance cleaning function for documentation of HACCP procedure
• Rail heat control via day/night load or dewpoint
• Humidity control in cold storage rooms
• Door function
• Control of night blinds
• Light control
• Heat thermostat
• High accuracy inputs will guarantee a better measuring accuracy than stated in the standard EN ISO 23953-2
without subsequent calibration (Pt 1000 ohm sensor)
• Support of user dened temp. sensor type
• Integrated MODBUS communication with the option of mounting a LonWorks communication card
Injection control
Adaptive superheat control
Liquid injection in the evaporator is controlled by an electronic injection valve of the type AKV. The valve operates
as both expansion valve and solenoid valve. The controller opens and closes the valve based on sensor readings.
Figure 7: Adaptive superheat control with AKV valve
Danfoss 84B2732
S2
AKV
p
e
The superheat is measured via a pressure sensor Pe and temperature sensor S2. By using a pressure sensor, and
temperature sensor a correct measurement of superheat is achieved under all conditions which ensures a very
robust and precise control. The signal from one pressure transmitter can be shared by max. 10 controllers, but only if
there is no signicant pressure dierence between the evaporators in question.
The function contains an adaptive algorithm which independently adjusts the valve’s opening so that the
evaporator constantly supplies optimum amount of refrigerant.
Adaptive liquid control
Adaptive liquid control is used in trans-critical CO
2
ejector systems, which allow liquid ow. When adaptive liquid
control is initiated, the superheat of the evaporator will be minimized so that a controlled amount of liquid is
present at the outlet of the evaporator.
This type of control requires that the controller receives an on/o signal from (for example) a suction accumulator in
the suction line.
© Danfoss | Climate Solutions | 2022.08 BC365022028193en-000201 | 9
AK-CC55 Multi Coil

Danfoss AK-CC55 Multi Coil Specifications

General

Brand	Danfoss
Model	AK-CC55 Multi Coil
Category	Controller
Language	English