Danfoss AK-CC55 User manual

User Guide
Case/room controller (EEV)
Type AK-CC55 Compact
SW Ver. 2.1x
For refrigeration appliances and cold storage rooms.

Contents
Introduction 5
Portfolio overview 6
Function overview 6
Connectivity 7
Data communication 7
AK-CC55 Compact 7
External display 7
Controller functionality 9
Functions 9
Injection control 9
Adaptive superheat control 9
Adaptive liquid control 9
Thermostatic expansion valve control 10
Temperature control 11
Temperature monitoring 11
Thermostat bands 11
Night setback of thermostat value 12
Temperature sensor types 12
Appliance cleaning 13
Appliance shutdown 13
Defrost 14
Electrical defrosting 14
Simple hot gas defrosting 14
Natural defrost 14
Start of defrost 14
Stop of defrost 15
Defrost sequence 15
Real-time clock 16
Coordinated defrost 16
Melt function 17
Control of two compressors (only with custom set-up) 17
Rail heat 18
Fan 19
Light function 20
AK-CC55 Compact
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Night blind 20
Heating function (only with custom set-up) 21
Digital inputs 21
Forced closing 21
Door contact 22
Display 22
Override 22
Applications 24
AK-CC55 Compact connections and application options 24
Application set-ups and IO connections 25
Product identication 28
AK-CC55 Compact connections 29
Data communication 29
AKV info 29
External solid state relay for rail heat 30
AKS 32R info 30
Coordinated defrost via cable connections 30
External display AK-UI55 31
Connections 31
Operation 33
Operation via data communication 33
Direct operation 33
Operation via AK-UI55 Set 33
Parameter groups when operating via display 35
Get a good start 35
AK-UI55 display menu (SW ver. 2.1x) 37
Thermostat 37
Alarm settings 37
Compressor 38
Defrost 38
Injection control 38
Fan control 39
Defrost schedule 39
Miscellaneous 39
Control 41
DO cong and manual 41
AK-CC55 Compact
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Service 42
Operation via AK-UI55 Bluetooth 44
AK-CC55 Connect menu (SW ver. 2.1x) 45
Start / Stop 45
Conguration 45
Thermostat control 46
Alarm limits and delays 48
Injection control 49
Defrost control 49
Defrost schedules 51
Compressor 51
Fan control 52
Railheat control 52
Light/Blinds/Cleaning control 53
Display control 54
Alarm relay priorities 54
Miscellaneous 55
Advanced 55
Fault message 57
Operating status 58
Product specication 59
Technical data 59
Electrical specications 59
Sensor and measuring data 59
Input and output relay specications 59
Function data 60
Environmental conditions 60
Dimensions 60
Ordering 61
Certicates, declarations, and approvals 62
Statements for the AK-UI55 Bluetooth display 63
Online support 64
AK-CC55 Compact
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Introduction
Application
Refrigeration appliance control with great exibility to adapt to refrigeration appliances and cold storage rooms.
Advantages:
• Control of Thermostatic Expansion Valve (TEV) and Electronic Expansion valve(EEV) applications
• Quick set-up with predened settings
• Easy conguration and service using a mobile app with Bluetooth
• 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 or two temperature sensors which are located in the air ow
before the evaporator (S3) or after the evaporator (S4) respectively. A setting for thermostat, alarm thermostat and
display reading determines the inuence the two sensor values should have for each individual function.
The temperature of the evaporator is registered with the S5 sensor which can be used as a defrosting sensor.
In addition to the output of the electronic AKV injection valve, the controller has relay outputs which are dened by
the application setting
Figure 1: AK-CC55 with evaporator, AKV valve and sensor positions
Danfoss 84B3281
S5
S3
S4
S2 P
AKV
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AK-CC55 Compact

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 Compact
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Figure 3: AK-CC55 Compact Figure 4: AK-CC55 Compact with external display.
Danfoss 84B8235
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 AK-CC55 Compact controller has built-in MODBUS data communication only.
AK-CC55 Compact
Compact version for controlling one evaporator.
An application mode setting will congure inputs and outputs for the desired use. There are nine applications to
choose from.
Regulation is performed using a TXV in combination with a liquid line solenoid valve, controlling a compressor or an
AKV expansion valve.
AK-CC55 Compact is without display, and can be extended with one external display (see Figure 3 and Figure 4):
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.
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AK-CC55 Compact

Figure 5: AK-UI55 Info Figure 6: AK-UI55 Set Figure 7: AK-UI55 Bluetooth
AK-CC55 Compact
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Controller functionality
Functions
• Day/night thermostat with ON/OFF or modulating principle
• Switch between thermostat settings via digital input
• Adaptive superheat control
• Adaptive liquid control
• Modulating PWM control of brine valve
• Start of defrost via schedule, digital input, network or setting display
• Natural, electric, simple hot gas, or warm brine 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 satised
• Appliance 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
• High accuracy inputs:
◦to guarantee a better measuring accuracy than stated in the standard EN ISO 23953-2 without subsequent
calibration (Pt1000 ohm sensor).
• Support of user dened temp. sensor type
• Integrated MODBUS communication
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 8: 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.
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AK-CC55 Compact

This type of control requires that the controller receives an on/o signal from (for example) a suction accumulator in
the suction line.
Figure 9: 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.
Thermostatic expansion valve control
In the compact version the refrigeration (injection) can be controlled either by starting/stopping a compressor or by
opening/closing a solenoid valve in the liquid line.
Figure 10: AK-CC55 Compact with evaporator, solenoid
valve, expansion valve and sensor positions
S4
S5
S3
Danfoss 84B3267
Brine control
When changing from ON/OFF control to modulating control in TXV applications, a solenoid valve can be PWM
controlled with a set period time from 30 – 900 sec. A number of additional brine control parameters are available in
the injection control menu. When brine control is enabled, a dedicated brine defrost can also be set up in order to
force open the brine valve while defrosting.
AK-CC55 Compact
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