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

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

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

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

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.

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

3 x AKV

Digital Output

Digital input

1 (2)

3 (2)

Analogue Output

Analogue Input

5 (4)

6 (7)

Display

1 remote

2 remote

1 remote + 1 Integrated

2 remote

Comm. module

Modbus

Optional comm. 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)

0 – 10 V to control external stepper driver

TXV - application (thermostatic expansion valve + solenoid valve or compressor)

Remote hot gas - application

One valve, one evaporator, one refrigeration section

One valve, one evaporator, two refrigeration sections

One valve and two evaporators, two refrigeration sections

Two valves and two evaporators (same refrigeration section)

Three valves and three evaporators (same refrigeration section)

Custom conguration of relay outputs

Two compressors

Heating function

Control of air humidity

Adaptive superheat

Adaptive liquid control

(zero superheat control for transcritical CO2systems with liquid ejectors)

Adaptive defrosting

Product sensor

Oil recovery

RS485 Lon, option (AK-OB55)

AK-CC55 Multi Coil

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

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

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

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

AKV

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.

AK-CC55 Multi Coil

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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