How it Works
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AK-CC55 Multi Coil
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Danfoss AK-CC55 Multi Coil User guide

User Guide
Case/room controller (EEV)
Type AK-CC55 Multi Coil
SW Ver. 1.8x
For refrigeration appliances and cold storage rooms.
AK-CC55 Multi Coil

Contents

Introduction 5
Portfolio overview 6
Connectivity 7
Controller functionality 9
Functions 9
Defrost 12
Rail heat 14
Night blind 15
Display 18
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AK-CC55 Multi Coil
Override 19
Applications 20
Product identication 23
Data communication 23
AKV info 24
External solid state relay for rail heat 24
AKS 32R info 24
Coordinated defrost via cable connections 25
External display AK-UI55 25
Connections 25
Operation 28
Parameter groups when operating via display 30
Get a good start 30
AK-UI55 display menu (SW ver. 1.8x) 32
Thermostat 32
Defrost 32
Fan control 33
Control 35
DO cong and manual 36
Service 37
Operation via AK-UI55 Bluetooth 39
AK-CC55 connect menu (SW ver. 1.8x) 40
Start / Stop 40
Conguration 40
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AK-CC55 Multi Coil
Fan control 50
Advanced 54
Operating status 58
Product specication 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
Certicates, declarations, and approvals 61
Online support 63
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S4/S4B/S4C
P
AKV
S2/S2B/S2C
S5/S5B
Danfoss
84B3293
AK-CC55 Multi Coil

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 CO2 systems 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
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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 Output3554
Digital input
1 (2)
3 (2)
3 (2)
3 (2)
Analogue Output1111
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
Application
AK-CC55 Compact
AK-CC55 Single Coil
AK-CC55 Single Coil UI
AK-CC55 Multi Coil
AKV - application (electrically operated expansion valve)
xxx
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
xxx
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 compressorsxx
Heating functionxx
x
Control of air humidity
x
x
Adaptive superheat
xxx
Adaptive liquid control (zero superheat control for transcritical CO2 systems with liquid ejectors)
xxx
Adaptive defrosting
x
Product sensor
x
RS485 Lon, option (AK-OB55)
x
x
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

Function overview

Table 2: AK-CC55 function overview by type
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Compact
System Manager
AKA 245: LON units only and max 250 controller parameters
Multi Coil
KoolProg
Single Coil UI
AK-UI Info
AK-UI Set
AK-UI Bluetooth
Bluetooth
AK-CC55 Connect
Smart Device (IOS
or Android)
Modbus
LON/ TCP/IP (SNMP)
Display Bus
Modbus
LON/ TCP/IP (SNMP)
Modbus
Case Controller Remote Display Service App
AK-CC55 Multi Coil

Connectivity

The diagram outlines the connectivity options presented by AK-CC55 for the design of system functionality.
Figure 2: Connectivity

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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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

AK-CC55 Multi Coil

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.

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.
Figure 4: AK-UI55 Info Figure 5: AK-UI55 Set Figure 6: AK-UI55 Bluetooth
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Dry expansion (MSS Control)
Adaptive liquid control (ALC)
AK-CC55 Multi Coil

Controller functionality

Functions

• Day/night thermostat with ON/OFF or modulating principle
• Switch between thermostat settings via digital input
• Adaptive control of superheat
• 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)
• Integrated MODBUS communication with the option of mounting a LonWorks communication card

Liquid injection by use of AKV

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.
The function contains an adaptive algorithm which independently adjusts the valve’s opening so that the evaporator constantly supplies optimum amount of refrigerant.
Superheat is measured via:
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.
There are two parallel settings for superheat:
• Dry expansion, which does not allow liquid ow on the outlet of the evaporator.
• Adaptive liquid control in transcritical CO2 systems, which allows liquid ow. This type of control requires that the controller receives an on/o signal from (for example) a suction accumulator in the suction line. 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.
Table 3: Liquid injection
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ON/OFF control
Modulating control
Danfoss
80Z8134
AK-CC55 Multi Coil
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):
1.
As an ON/OFF regulation with a dierential using the individual S4 sensor per evaporator.
2.
As a modulating control, using the individual S4 sensor per evaporator.
3.
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 4: Control methods

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.

Thermostat bands

Thermostat bands can be used benecially for appliances where dierent product types are stored, which requires dierent temperature conditions. It is possible to change between the two dierent thermostat bands via a contact
signal on a digital input. Separate thermostat and alarm limits can be set for each thermostat band.
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AK-CC55 Multi Coil
Figure 7: Thermostat band function with two dierent band settings

Night setback of thermostat value

In refrigeration appliances there may be big load dierences between the shop’s opening and closing hours, especially if night lids/blinds are used. The thermostat reference may be raised here without it having any eect on the product temperature.
Change-over between day and night operation can take place as follows:
• via an external switch connected to a digital input
• via a signal from the data communication system
Figure 8: Thermostat band function with Night setback

Appliance cleaning

This function makes it easy for the shop’s sta to carry out a cleaning of the appliance according to a standard procedure. Appliance cleaning is activated via a pulse signal – as a rule via a key switch placed on the appliance or via the AK-CC55 Connect mobile app.
Appliance cleaning is carried out via three phases:
1.
At the rst activation, the refrigeration is stopped, but the fans keep on operating in order to defrost the evaporators. ”Fan” is shown on the display.
2.
At the second activation, the fans are also stopped and the appliance can now be cleaned. ”OFF” is shown on the display.
3.
At the third activation, refrigeration is recommenced. The display will show the actual appliance temperature, o97 setting.
When appliance cleaning is activated, a cleaning alarm is transmitted to the normal alarm recipient. A later processing of these alarms will document that the appliance has been cleaned as often as planned.
There are no temperature alarms during appliance cleaning.
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-++°C1÷+
Fan2÷÷O3++°C
AK-CC55 Multi Coil
Table 5: Appliance cleaning function

Appliance shutdown

The function closes the AKV valve and all outputs are switched o. The cooling appliance is stopped like the “Main switch”, but this happens without an “A45 standby alarm”. The function can be enabled by a switch on the DI input or via a setting through data communication.

Defrost

Depending on the application, you may choose between the following defrost methods: Natural: Here the fans are kept operating during the defrost Electric: The heating element is activated

Start of defrost

A defrost can be started in dierent ways:
Interval:
Defrost is started at xed time intervals like e.g. every eighth hour. An interval must ALWAYS be set to a "higher" value than the period set between two defrostings when a schedule or network signal is used.
Week schedule:
Here defrost can be started at xed times of the day and night. However, max. 6 defrosts per day.
Contact:
Defrost is started with a contact signal on a digital input.
Figure 9: Defrost start
Network:
The defrost start signal is received from a system manager via data communication.
Max. thermostat runtime:
When the aggregate time has passed a preset value, a defrost will be initiated.
Manual:
An extra defrost can be activated from the defrost button on the AK-UI55 Set display or via a parameter setting. All the mentioned methods can be used in parallel – if just one of them is activated, a defrost will be started.

Stop of defrost

Defrosting can be stopped by either:
• Time
• Temperature (with time as safety)
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System manager
Max 10.
Danfoss
84B8268
AK-CC55 Multi Coil

Fan control during defrost

The fans can be stopped or operated during defrosting. They can also run and then be stopped at a set temperature. The temperature signal is obtained from the defrost stop sensor.

Defrost sequence

1.
Pump down
2.
Defrost
3.
Waiting position after defrost
4.
Drip o
5.
Delay of fan

Real-time clock

The controller has a built-in real-time clock which can be used to start defrosts. This clock has a power reserve of four days.
If the controller is equipped with data communication, the clock will automatically be updated from a Danfoss system manager.

Coordinated defrost

There are two ways in which coordinated defrost can be arranged.
Figure 10: Coordinated defrost options
Either with wire connections between the controllers or via data communication:
Wire connections
The digital input DI2 must be congured for coordinated defrost and wiring must be connected between the relevant controllers. When one controller starts a defrost, all the other controllers will follow suit and likewise start a defrost. After the defrost, the individual controllers will move into waiting position. When all are in waiting position there will be a change-over to refrigeration.
Coordination via data communication
Here the system manager handles the coordination. The controllers are gathered in defrosting groups and the system manager ensures that defrosting is started in the group according to a weekly schedule.
When a controller has completed defrosting, it sends a message to the system manager and then goes into a waiting position. When every controller in the group is in a waiting position, refrigeration is again permitted in all the individual controllers.

Melt function

This function will prevent the air ow in the evaporator from being reduced by frost created by uninterrupted operation for a long time.
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AK-CC55 Multi Coil
The function is activated if the thermostat temperature has remained in the range between -5 °C and +10 °C for a longer period than the set melting interval. The refrigeration will then be stopped during the set melting period. The frost will be melted so that the air ow and hence the evaporator’s capacity will be greatly improved.

Rail heat

It is possible to pulse-control the power to the rail heat in order to save energy. Pulse control can either be controlled according to day/night load or dew point.
Relay or analogue output
A relay output can be used when long cycle times are permitted. If fast pulsing is required, the AO1/PWM output can be used. The output must be connected to an external power solid state relay. The cycle time must be congured for the relay output in o43 or for analogue output in P82.
Pulse control according to day and night
Various ON periods can be set for day and night operation. A cycle time is set as well as the percentage part of the period in which the rail heat is ON.
Figure 11: Rail heat control, day/night load
Pulse control according to dewpoint
In order to use this function, a system manager of the type AK-SM is required which can measure ambient temperature and humidity to calculate dew point and distribute to the appliance controllers. For this the rail heat’s ON period is controlled according to the distributed dewpoint.
Two dew point values are set in the appliance control:
• One where the eect must be max. i.e. 100%. (o87)
• One where the eect must be min. (o86)
At a dewpoint which is equal to or lower than the value in 086, the eect will be the value indicated in o88. In the area between the two dew point values, the controller will manage the power to be supplied to the rail heat.
Figure 12: Rail heat control, dew point
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AK-CC55 Multi Coil
During defrosting
During defrosting rail heat can be selected to be OFF, ON or run normal control as selected in setting d27.

Fan pulse control

To obtain energy savings, it is possible to pulse control the power supply to the evaporator fans. Pulse control can be accomplished in one of the following ways:
• during the thermostat’s cut-out period (cold room)
• during night operation and during the thermostat’s cut-out period (appliance with night blinds) (The function is not actual when r14=2, i.e. modulating regulation).
A period of time is set as well as the percentage of this period of time where the fans have to be operating.
Figure 13: Fan cycle time
Cut-out of fans during plant breakdowns
If the refrigeration in a breakdown situation stops, the temperature in the cold room may rise quickly as a result of the emission of heat from large fans. In order to prevent this situation, the controller can stop the fans if the temperature at S5 exceeds a set limit value. The fans will start running again when the S5 temperature has dropped 2K below the set limit. (The function can also be used as a type of MOP function. Here the load on the compressors is limited until the S5 temperature has fallen below the congured value).

Light function

The function can be used for controlling the light in a refrigeration appliance or in a cold room. It can also be used for controlling a motorised night blind.
The light function can be dened in several ways:
• The light is controlled via a signal from a door contact. The light is kept on for a set time after the door has been closed.
• The light is controlled via the day/night function
• The light is controlled via a DI input or remote light control from a system manager.
• The light is controlled via the data communication from a system manager.
Here there are two operational options if data communication should fail:
• The light can go ON
• The light can stay in its current mode
The light load must be connected to the NC terminals on the relay. This ensures that the light remains ON in the appliance if power to the controller should fail. A setting denes how light is controlled when regulation is stopped via r12 Main switch = OFF (see o98). The light is switched o when the appliance cleaning function is activated.

Night blind

Motorised night blinds can be controlled automatically from the controller via the NO connector on the light relay. The night blinds will follow the status of the light function. When the light is switched on, the night blinds open, and when the light is switched o, the night blinds close again. When the night blinds are closed, it is possible to open them using a switch signal on the digital input. If this pulse signal is activated, the night blinds will open and the refrigeration appliance can be lled with new products. If the pulse signal is activated again, the blinds close.
A night blind is opened when the appliance cleaning function is activated.
A setting can dene that the night blind is opened when "r12" (Main switch) is set to o (see o98).
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Temperature
Time
Humidity max temp.
Diff.
Diff.
Humidity min temp.
Humidity
control
enabled
Danfoss
80G8212
Danfoss
80G8221
Humidity
Time
Humidity diff.
SP
Humidifier
100%
AK-CC55 Multi Coil
When the night blind rolls down, the fan will be stopped for the set time. The night blind can thereby roll down to the correct position.

Humidity control

In application 4 when setup for room control it is possible to dene if humidity control should be done via a humidier or a dehumidier.
When humidity control is enabled, the second display will read out the actual humidity.
The controller measures the humidity via a 0 – 10 V signal from a humidity sensor and by means of a DO relay it can activate a humidier or a de-humidier.
High and low humidity alarm limits can be set to generate a humidity alarm.
Humidity control is disabled when main switch is OFF, at manual control, at case shutdown, at forced closing mode, at door open, if cooling is stopped, at humidity sensor error and at case cleaning.
It is possible to dene whether humidity control is enabled during defrost or not.
Figure 14: Humidity control
A Max and Min temperature range can be dened wherein the humidity control is enabled. Upper and lower dierential is xed at 1K.
Figure 15: Humidier control
If the humidity gets below the SP, then humidication is started via a DO signal to a humidier.
If the humidity increases to SP + humidity dierential, then humidication is stopped.
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Danfoss
84B8269
A
r01
r01
t
º C
r62
B
C
ABC
Refrigeration
Neutral zone
Heat
Danfoss
80G8222
Humidity
Time
Humidity diff.
100%
SP
Dehumidifier
AK-CC55 Multi Coil
Figure 16: Dehumidier control
If the humidity rises above the SP, then dehumidication is started via a DO signal to a dehumidier.
If the humidity drops below the SP – Humidity dierential, then dehumidication is stopped.

Heating function (application 4 only)

The heating function is used to prevent the temperature from becoming too low, e.g. in a cold room, etc. The limit for when the heating function cuts o is set as an oset value below the current cut-out limit for the refrigeration thermostat. This ensures that refrigeration and heating do not occur simultaneously. The dierence for the heating thermostat has the same value as for the refrigeration thermostat. To prevent that the heating thermostat cuts in during short-term drops in air temperature, a time delay can be set for when to change from refrigeration to heating.
Figure 17: Heating function

Digital inputs

There are two digital inputs, DI1 and DI2, with dry contact function, and one digital input DI3 with high voltage signal.
They can be used for the following functions:
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Function
Input / Settings menu
Setting
DI1
DI2
DI3
o02
o37
o84
None+++0
DI Status+++1
Door function+++2
Door alarm+++3
Defrost start+++4
Main switch+++5
Night setback+++6
Thermostat band
+++
7
Alarm at closed++
8
Alarm at open++
9
Case cleaning+++10
Forced cooling+++11
Open blinds+++12
Coordinated defrost
+
13
Forced closing+++14
Shutdown+++15
Light control+++16
Leak detection+++20
Adaptive liquid control
+++
21
AK-CC55 Multi Coil
Table 6: Function table and DI settings
Example: If DI1 is to be used to start a defrost, o02 must be set to 4.

Forced closing

The AKV valves can be closed with an external signal ("Forced closing").
The function must be used in connection with the compressor’s safety circuit, so that there will be no injection of liquid into the evaporator when the compressor is stopped by the safety controls and cannot start again (however not at low pressure – LP).
Via a setting (see o90 Fan at forced closing) it is possible to dene whether the fan should be ON or OFF during forced closing and whether an ongoing defrost is suppressed (i.e. put in standby position for a period of up 10 minutes before it is cancelled) - this feature can be used in CO2 systems to eliminate excessive heating while compressors cannot run.
The signal can be received from the DI-input or via the data communication.

Door contact

The door contact function can via the digital inputs be dened for two dierent applications:
Alarm monitoring:
The controller monitors the door contact and delivers an alarm message if the door has been opened for a longer period than the set alarm delay.
Alarm monitoring and stop of refrigeration:
When the door is opened, the refrigeration is stopped, i.e. the injection, the compressor and the fan are stopped and light switches on. If the door remains open for a longer time than the set restart time, refrigeration will be resumed. This will ensure that refrigeration is maintained even if the door is left open or if the door contact should be defective. If the door remains open for a longer period than the set alarm delay, an alarm will also be triggered.

Display

The controller has one or two plugs for an external display. One of the following display types can be connected to a plug:
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Danfoss
84B8238
Master control function
Description
MC Ther. toggle
Master control signal used for switching case load ON/OFF depending on the load condition
MC Load request
Master control signal used to control the load balance between multiple case controllers on the same suction line
MC Max. Te
oset
Requested
oset to actual evaporating temperature in order to keep the air temperature at the actual setpoint
MC Liquid control
Master control signal allowing switch to adaptive liquid control
MC Night setback
Master control signal for changing between day and night time operation
MC Case shutdown
Master control signal used to shut down a case for a time period. During shutdown there will be no alarm monitoring
MC Forced closing
Master control signal that will close the injection valve
MC Forced cooling
Master control signal that will provide forced cooling
MC Defrost start
Master control signal for starting a defrost. At adaptive defrost the defrost might be skipped if the defrost is not needed
MC Defrost state
Read out the actual state of the defrost
MC Hold after defrost
Master control signal used for co-ordinated defrost control to hold cabinets from returning to normal refrigeration after a defrost until all cabinets have terminated defrost
MC Stop defrost
Master control signal used to prevent a defrost start in a controller.
MC Light signal
Master control signal for control of light via a data communication signal from the system manager
MC Actual dewpoint
Master control signal sending the actual measured dewpoint from the system manager to the controller over the network.
MC Bluetooth lock
Master control signal that will lock down all Bluetooth data communication
AK-CC55 Multi Coil
• AK-UI55 Info (temperature display)
• AK-UI55 Set (temperature display and operation)
• AK-UI55 Bluetooth (temperature display and app interface)
The connection between the display and the controller must be made using an AK-UI55 cable. The distance between the controller and the display must not exceed 100 m. If there are two external displays, it will be the sum of the two distances that cannot exceed 100 m.
Figure 18: Controller with two displays

Override

The controller contains a number of override functions which can be used together with Master Control functions in the Danfoss gateway/system manager:
Table 7: Override functionality
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