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

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

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

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

S2 P

AKV

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

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 Compact

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

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.

AK-CC55 Compact

Figure 5: AK-UI55 Info Figure 6: AK-UI55 Set Figure 7: AK-UI55 Bluetooth

AK-CC55 Compact

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

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.

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

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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