Danfoss AK-CC55 User manual

User Guide
Case/room controller (EEV)
Type AK-CC55 Multi Coil
SW Ver. 1.9x
For refrigeration appliances and cold storage rooms.

Contents
Introduction 5
Portfolio overview 6
Function overview 6
Connectivity 7
Data communication 7
AK-CC55 Multi Coil 8
External display 8
Controller functionality 9
Functions 9
Injection control 9
Adaptive superheat control 9
Adaptive liquid control 9
Temperature control 10
Temperature monitoring 10
Thermostat bands 11
Night setback of thermostat value 11
Temperature sensor types 11
Appliance cleaning 12
Appliance shutdown 13
Defrost 13
Electrical defrosting 13
Natural defrost 13
Start of defrost 13
Stop of defrost 14
Defrost sequence 14
Real-time clock 15
Coordinated defrost 15
Melt function 15
Rail heat 15
Fan pulse control 16
Light function 17
Night blind 17
Humidity control 17
Heating function (application 4 only) 19
AK-CC55 Multi Coil
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Digital inputs 19
Forced closing 20
Door contact 20
Display 20
Override 21
Applications 22
AK-CC55 connections and application options 22
Application set-ups and IO connections 23
Product identication 25
AK-CC55 Multi Coil connections 25
Data communication 25
AKV info 26
External solid state relay for rail heat 26
AKS 32R info 26
Coordinated defrost via cable connections 27
External display AK-UI55 27
Connections 27
Operation 29
Operation via data communication 29
Direct operation 29
Operation via AK-UI55 Set 29
Parameter groups when operating via display 31
Get a good start 31
AK-UI55 display menu (SW ver. 1.9x) 33
Thermostat 33
Alarm settings 33
Defrost 34
Injection control 34
Fan control 34
Defrost schedule 34
Humidity control 35
Miscellaneous 35
Control 37
DO cong and manual 37
Service 38
Operation via AK-UI55 Bluetooth 40
AK-CC55 Multi Coil
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AK-CC55 connect menu (SW ver. 1.9x) 41
Start / Stop 41
Conguration 41
Thermostat control 43
Alarm limits and delays 44
Humidity control 46
Injection control 47
Defrost control 48
Defrost schedules 50
Fan control 51
Railheat control 52
Light/Cleaning control 53
Display control 53
Alarm relay priorities 54
Miscellaneous 55
Advanced 55
Fault message 58
Operating status 60
Product specication 61
Technical data 61
Electrical specications 61
Sensor and measuring data 61
Input and output relay specications 61
Function data 62
Environmental conditions 62
Dimensions 62
Ordering 63
Certicates, declarations, and approvals 64
Statements for the AK-UI55 Bluetooth display 65
Online support 66
AK-CC55 Multi Coil
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Introduction
Application
Complete refrigeration appliance control with great exibility to adapt to refrigeration appliances and cold storage
rooms.
Advantages:
• Universal controller for control of up to 3 AKV valves in same refrigeration section
• Quick set-up with predened settings
• Easy conguration and service using a mobile app with Bluetooth
• Energy optimization of the whole refrigeration appliance
• Adaptive Minimum Stable Superheat (MSS) control is performed with lowest possible superheat
• Allows the suction pressure to be raised several degrees
• Adaptive Liquid Control (ALC) can be performed with superheat down to 0 degrees on transcritical CO2systems
with liquid ejectors
Principle
The temperature in the appliance is registered by one to three S4 air temperature sensors which can be located in
the air ow of the evaporator. A setting for display read-out determines, if thermostat A temperature, the average S4
temperature or the highest S4 temperature is read out in the display.
If two displays are connected, it can be selected to read-out thermostat A temperature in display 1 and thermostat B
temperature in display 2.
The temperature of the evaporator is registered with one or two S5 sensors which can be used as a defrosting
sensor.
In addition to the outputs of the electronic AKV injection valves, the controller has relay outputs which are dened
by the application setting.
Figure 1: AK-CC55 with evaporator, AKV valve and sensor positions
S4/S4B/S4C
P
AKV
S2/S2B/S2C
S5/S5B
Danfoss 84B3293
Hint: On cold rooms the S4 sensor can be placed at the air inlet of the evaporator.
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AK-CC55 Multi Coil

Portfolio overview
The AK-CC55 portfolio contains four controllers with dierent functionalities and application settings, as outlined in
the table.
Table 1: AK-CC55 Portfolio
AK-CC55 Compact
AK-CC55 Single Coil
AK-CC55 Single Coil UI
AK-CC55 Multi Coil
Product image
Valve
1 x TXV or AKV
1 x AKV
1 x AKV
3 x AKV
Digital Output
3
5
5
4
Digital input
1 (2)
3 (2)
3 (2)
3 (2)
Analogue Output
1
1
1
1
Analogue Input
5 (4)
6 (7)
6 (7)
6 (7)
Display
1 remote
2 remote
1 remote + 1 Integrated
2 remote
Comm. module
Modbus
Modbus
Modbus
Modbus
Optional comm. module
LON module
LON module
LON module
Function overview
Table 2: AK-CC55 function overview by type
Application
AK-CC55 Compact
AK-CC55 Single Coil
AK-CC55 Single Coil UI
AK-CC55 Multi Coil
AKV - application (electrically operated expansion valve)
x
x
x
0 – 10 V to control external stepper driver
x
TXV - application (thermostatic expansion valve + solenoid valve or compressor)
x
Remote hot gas - application
x
One valve, one evaporator, one refrigeration section
x
x
x
One valve, one evaporator, two refrigeration sections
x
One valve and two evaporators, two refrigeration sections
x
Two valves and two evaporators (same refrigeration section)
x
Three valves and three evaporators (same refrigeration section)
x
Custom conguration of relay outputs
x
x
Two compressors
x
x
Heating function
x
x
Control of air humidity
x
x
Adaptive superheat
x
x
x
Adaptive liquid control
(zero superheat control for transcritical CO2systems with liquid ejectors)
x
x
x
Adaptive defrosting
x
Product sensor
x
Oil recovery
x
RS485 Lon, option (AK-OB55)
x
x
AK-CC55 Multi Coil
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Connectivity
The diagram outlines the connectivity options presented by AK-CC55 for the design of system functionality.
Figure 2: Connectivity
Remote Display Service App
AKA 245: LON units
only and max 250
controller parameters
System Manager
Display Bus
Modbus
Modbus LON/ TCP/IP (SNMP)
Modbus LON/ TCP/IP (SNMP)
Bluetooth
AK-UI55 Bluetooth
AK-UI55 Set
AK-UI55 Info
Smart Device
(iOS or Android)
AK-CC55 Connect
AK-CC55 Single Coil UI
AK-CC55 Multi Coil
AK-CC55 Compact
KoolProg
Case Controller
Danfoss 80G8333
Data communication
The controller has built-in MODBUS data communication. If there is a requirement for a dierent form of data
communication, a Lon RS 485 module can be inserted in the controller.
The connection must then be to the module.
Figure 3: Mounting of communication module
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AK-CC55 Multi Coil

Figure 4: AK-UI55 Info Figure 5: AK-UI55 Set Figure 6: AK-UI55 Bluetooth
AK-CC55 Multi Coil
AK-CC55 Multi Coil – Controlling up to 3 AKV valves.
An application mode setting will congure inputs and outputs for the desired use. There are ve applications to
choose from.
Standard enclosure. Typically used for display cases
where the controller is mounted in a tray.
Danfoss 84B8236
The standard enclosure can be expanded with one or
two external displays.
Danfoss 84B8238
External display
There are three versions available with dierent functions:
• AK-UI55 Info: Temperature display.
• AK-UI55 Set: Temperature display with control buttons on the front.
• AK-UI55 Bluetooth: Temperature display with Bluetooth communication, for use with AK-CC55 Connect Mobile
app.
AK-CC55 Multi Coil
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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
pe
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 CO2ejector 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.
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AK-CC55 Multi Coil

1.
2.
3.
Figure 8: Adaptive liquid control with AKV valve
A level switch in the tank will register when the liquid level exceeds the max. level. When this happens, the
controller will switch to dry expansion, and then back to liquid control when the liquid level has dropped. The
function is dened in setting o02, o37 or o84.
The function can also be activated via data communication from a system unit. If the adaptive liquid control signal is
lost, the controller will automatically switch back to dry expansion.
WARNING:
Accidental actuation may allow liquid throughput to the compressor. It is the installer’s responsibility to ensure that
signal loss to the controller will not result in liquid throughput to the compressor. Danfoss accepts no responsibility
for damage resulting from inadequate installation.
Temperature control
The temperature in the appliance is registered by one up to three S4 air temperature sensors.
The actual temperature control can take place in three ways (same thermostat set point used for all evaporators):
As an ON/OFF regulation with a dierential using the individual S4 sensor per evaporator.
As a modulating control, using the individual S4 sensor per evaporator.
As one ON/OFF thermostat common for all evaporators. It can be selected to use:
◦the S4A air temperature sensor,
◦the average of all S4 air temperature sensors,
◦the highest value of all S4 air temperature sensors for the common thermostat.
There is, however, a limit to the use of a modulating control as it can only be used in remote cabinets. It is not
recommended to use modulating thermostat control in low temperature applications. In applications with one
evaporator and one compressor the thermostat function with ON/OFF control should be selected. In remote
cabinets, the thermostat function may either be selected for ON/OFF control or modulating control.
Table 3: Control methods
ON/OFF control
Modulating control
Danfoss 80Z8134
Temperature monitoring
The individual S4A, S4B and S4C air sensors are always used for temperature alarm monitoring independent of
which sensor is dened as thermostat sensor. Common settings for High temperature limit, Low temperature limit
and alarm delays are used for all 3 sensors, and alarms are generated for each individual evaporator section. A
longer time delay can be set for high temperature alarm. This time delay is active for pull-down after defrosting,
appliance cleaning and start-up.
AK-CC55 Multi Coil
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