Danfoss AK-CC55 User manual

User Guide

Case controller for semi plug-in

Type AK-CC55 Water Loop

SW Ver. 1.2x

For refrigeration appliances and cold storage rooms.

Contents

Introduction 5

Connectivity 7

Data communication 7

AK-CC55 Water Loop 7

External display 7

Controller functionality 9

Functions 9

Temperature control 9

Temperature monitoring 10

Thermostat bands 10

Night setback of thermostat value 10

Temperature sensor types 10

Compressor and Pump control 11

Voltage signal 13

Frequency signal 14

PWM signal 14

Condenser monitoring and control 16

Appliance cleaning 18

Appliance shutdown 18

Defrost control 18

Electrical defrosting 19

Hot gas defrosting 19

Natural defrost 19

Start of defrost 19

Stop of defrost 20

Defrost sequence 20

Real-time clock 21

Coordinated defrost 21

Melt function 22

Rail heat 22

Fan 23

Light function 24

Night blind (only with custom set-up) 24

Heating function (only with custom set-up) 25

Digital inputs 25

AK-CC55 Water Loop

Door contact 26

Display 26

Override 26

Applications 28

AK-CC55 Water Loop connections and application options 29

Wiring diagram 30

Wiring 33

Special wiring details 34

Data communication 34

External solid state relay for rail heat 34

Coordinated defrost via cable connections 34

External display AK-UI55 35

Operation 36

Operation via data communication 36

Smart phone and app via AK-UI55 Bluetooth display 36

Operation via AK-UI55 Set 36

Parameter groups when operating via display 38

Get a good start 38

AK-UI55 display menu (SW ver. 1.2x) 40

Thermostat 40

Alarm settings 40

Compressor 41

Defrost 41

Fan control 42

Defrost schedule 42

Miscellaneous 42

Control 43

DO cong and manual 44

Service 45

Operation via AK-UI55 Bluetooth 47

AK-CC55 Connect menu (SW ver. 1.2x) 48

Start / Stop 48

Conguration 48

Thermostat control 50

Alarm limits and delays 51

AK-CC55 Water Loop

Defrost control 52

Defrost schedules 53

Compressor/Pump control 54

Condenser control 55

Fan control 56

Railheat control 56

Light/Blinds/Cleaning control 57

Display control 57

Alarm relay priorities 58

Miscellaneous 59

Advanced 59

Fault message 60

Operating status 61

Product specication 62

Technical data 62

Electrical specications 62

Sensor and measuring data 62

Input and output relay specications 62

Function data 62

Environmental conditions 63

Dimensions 63

Ordering 64

Certicates, declarations, and approvals 65

Statements for the AK-UI55 Bluetooth display 66

Online support 67

AK-CC55 Water Loop

Introduction

Application

Refrigeration appliance control for semi plug-in cabinets with a water cooled condenser.

Advantages:

• Broad application coverage for single compressor, dual compressor, variable speed compressor and variable speed

brine pump

• Quick set-up with predened settings

• Easy conguration and service using a mobile app with Bluetooth

• Robust and precise temperature control via variable speed control of compressor or brine pump

• Oil return management ensuring a long lifetime of the variable speed compressor

• Safety monitoring of high condenser brine inlet temperature

• Option for second condenser outlet brine temperature

• Safety monitoring of compressor and/or variable speed drive

Principle

The temperature in the appliance is registered by one or two temperature sensors 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.

On the condenser side, an S7 sensor is to be mounted at the brine inlet temperature and optionally an S8 sensor can

be mounted at the brine outlet.

The outputs will be congured based on the selected application and for some applications some of the digital

outputs can be user dened.

Application coverage

The AK-CC55 Water Loop controller has a broad application coverage and supports the following main applications:

Figure 1: Application 1,2,5 and 6

Danfoss

84B8288

Single compressor application with either on/o or variable speed control of the compressor.

AK-CC55 Water Loop

Figure 2: Application 3 and 4

Danfoss

84B8289

Dual compressor application with either sequential or cyclic on/o control of the two compressor circuits.

Figure 3: Application 7 and 8

Danfoss

84B8298

Variable speed control of a feeding brine pump.

AK-CC55 Water Loop

Figure 5: AK-CC55 Water Loop Figure 6: AK-CC55 Water Loop with external display.

Danfoss

84B8235

Connectivity

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

Figure 4: 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 Water Loop controller has built-in MODBUS data communication only.

AK-CC55 Water Loop

An application mode setting will congure inputs and outputs for the desired use. There are eight applications to

choose from.

Temperature control is performed by on/o control of a single or dual compressor, variable speed control of a

compressor or a brine pump.

AK-CC55 Water Loop is without display, and can be extended with one external display (see Figure 5 and Figure 6):

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 Water Loop

Figure 7: AK-UI55 Info Figure 8: AK-UI55 Set Figure 9: AK-UI55 Bluetooth

AK-CC55 Water Loop

Controller functionality

Functions

• ON/OFF temperature control via a single or dual compressor

• Precise temperature control via variable speed control of compressor or brine pump

• Variable speed control via voltage (0 – 10 V), frequency or PWM signal

• Oil return management for extended lifetime of compressor

• Resonance avoidance range for eliminating mechanical noise from unit

• Safety monitoring of condenser inlet temperature and compressor safety chain

• Switch between thermostat bands via digital input

• Start of defrost via schedule, runtime, digital input, network or setting display

• Natural, electrical or simple hot gas 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 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)

• Integrated MODBUS communication

Temperature control

The temperature in the appliance is registered by one or two temperature sensors which are located in the return air

before the evaporator (S3) or after the evaporator (S4) respectively. A setting for the thermostat, night thermostat,

alarm thermostat and display reading determines how much the two sensor values should inuence each individual

function, e.g. 50% of S4 will produce an equal value from both sensors.

The actual temperature control can take place in two ways:

As an ordinary ON/OFF regulation with a dierential, or

As a modulating control where the temperature variation will not be nearly as high as in ON/OFF control.

Figure 10: Control methods

AK-CC55 Water Loop

Temperature monitoring

Just as is possible for the thermostat, the alarm monitoring can be set with a weighting between S3 and S4 so that

you can decide how much the two sensor values should inuence the alarm monitoring. Minimum and maximum

limits can be set for alarm temperature and time delays. 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.

For the defrost control, separate defrost stop temperature and max. defrost time can be set for each thermostat

band. For the compressor control it is possible to disable the second compressor in thermostat band 2 if required.

Figure 11: 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 12: Thermostat band function with Night setback

Temperature sensor types

For the S3, S4, S5, S7 and S8 sensors, the user can select between the following sensor types:

0 = Pt1000 (Danfoss AKS 11)

1 = PTC1000 (Danfoss EKS 111)

2 = NTC 5k (Danfoss EKS 211)

3 = NTC 10k (Danfoss EKS 221)

4 = User-dened

AK-CC55 Water Loop

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