2
User
Guide RS8GR602 © Danfoss 2016-10
AK-CT
450A
Introduction
Application
Complete refrigeration appliance control with great flexibility to
adapt to all types of refrigeration appliances and cold storage
rooms.
• For refrigeration with brine
• For use with a thermostatic expansion valve (TEV)
Advantages
• Optimised for installation by manufacturer
• Electricity-controlled and voltage controlled relay connections
• Loads requiring electricity can be connected directly
• Overcurrent limitation
• Energy optimisation of the whole refrigeration appliance
• One controller for several different refrigeration appliances
• Quick set-up with predefined settings
• Built-in data communication
• Built-in clock function with power reserve
Principle
The temperature in the appliance is registered by one or two
temperature sensors which are located in the air flow before the
evaporator (S3) or after the evaporator (S4) respectively.
A setting for thermostat, alarm thermostat and display reading
determines the influence the two sensor values should have for
each individual function.
In addition product sensor S6, which can be optionally placed in
the appliance, can be used to register the temperature near the
required product in a certain place within the appliance.
The temperature of the evaporator is registered with the S5 sensor
which can be used as a defrosting sensor.
In addition to the output for the solenoid valve type EVR the con-
troller has 9 relay outputs which are defined by the use selected –
the individual usage options are described in detail on page 12
Functions
• Day/night thermostat with ON/OFF or modulating principle
• Product sensor S6 with separate alarm limits
• Switch between thermostat settings via digital input
• Start of defrost via schedule, digital input or network
• Natural, electric, hot gas defrost or brine defrost
• Stop of defrost on time and/or temperature
• Coordination of defrosting among several controls
• Pulsing of fans when thermostat is satisfied
• Case cleaning function for documentation of HACCP procedure
• Rail heat control via day/night load or dew point
• Door function
• Control of two compressors
• Control of night blinds
• Light control
• Heat thermostat
• Integrated MODBUS communication with the option of
mounting a LonWorks communication card
Appliance examples
Contents
Introduction ....................................................................................................... 2
Operation ............................................................................................................ 4
Applications .....................................................................................................12
Connections .....................................................................................................17
Survey of functions ........................................................................................19
Operation ..........................................................................................................32
Menu survey .....................................................................................................33
Ordering ............................................................................................................39
Data .....................................................................................................................40
