1.
2.
Controller functionality
Functions
• ON/OFF temperature control via a single or dual compressor
• Precise temperature control via variable speed control of compressor or brine pump
• Variable speed control via voltage (0 – 10 V), frequency or PWM signal
• Oil return management for extended lifetime of compressor
• Resonance avoidance range for eliminating mechanical noise from unit
• Safety monitoring of condenser inlet temperature and compressor safety chain
• Switch between thermostat bands via digital input
• Start of defrost via schedule, runtime, digital input, network or setting display
• Natural, electrical or simple hot gas defrost
• Stop of defrost on time and/or temperature
• Coordination of defrosting among several controllers in a line-up
• Pulsing or ECO control of fans when thermostat is satised
• Appliance cleaning function for documentation of HACCP procedure
• Rail heat control via day/night load or dew point
• Door function
• Control of night blinds
• Light control
• Heat thermostat
• High accuracy inputs:
◦ to guarantee a better measuring accuracy than stated in the standard EN ISO 23953-2 without subsequent
calibration (Pt1000 ohm sensor)
• Integrated MODBUS communication
Temperature control
The temperature in the appliance is registered by one or two temperature sensors which are located in the return air
before the evaporator (S3) or after the evaporator (S4) respectively. A setting for the thermostat, night thermostat,
alarm thermostat and display reading determines how much the two sensor values should inuence each individual
function, e.g. 50% of S4 will produce an equal value from both sensors.
The actual temperature control can take place in two ways:
As an ordinary ON/OFF regulation with a dierential, or
As a modulating control where the temperature variation will not be nearly as high as in ON/OFF control.
Figure 10: Control methods
© Danfoss | Climate Solutions | 2022.04 BC378540472015en-000101 | 9
AK-CC55 Water Loop
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