Danfoss EKC 223 User manual

User Guide

Case controller

Type EKC 223 and EKC 224

SW Ver. 1.0x

For refrigerated display cabinets, cold storage rooms and simple heating applications.

Contents

Introduction 5

Application 5

Principle 5

Advantages 5

System overview 5

Functions 7

Temperature sensors 7

Defrost sensor 7

Condenser temperature sensor 7

Voltage protection 7

Condenser temperature monitoring 7

Change of temperature reference 8

Night setback 8

Digital inputs 9

Door contact function 9

Defrost 9

Start of defrost 9

Coordinated defrost via network 10

Defrost on demand 10

Applications 11

EKC 224 applications 11

EKC 223 applications 11

Wiring diagrams 12

EKC 224 12

EKC 223 13

Electrical connections 13

Installation 15

Installation considerations 15

Integration into network systems 15

Installation 16

Wiring 16

Conguration 18

DI input conguration 18

Case controller, type EKC 223 and EKC 224

Alarm codes 18

Control status 18

Operation 20

Operation via display 20

Key operations 20

View alarms 20

Lock keyboard 21

Factory resetting 21

Display codes 21

Parameter list 21

Quick setup – get a good start 22

Parameters 23

Parameter description 23

Conguration 23

Thermostat 24

Alarm settings 24

Defrost 25

Fan 26

Compressor 27

Miscellaneous 27

Polarity 28

Service 29

EKC 223, 224 display menu 29

Conguration 29

Thermostat 30

Alarm settings 30

Defrost 31

Fan 31

Compressor 31

Miscellaneous 31

Polarity 32

Service 32

Product specication 34

Technical specication 34

Mounting 34

Installation steps 35

Case controller, type EKC 223 and EKC 224

Dimensions 35

Ordering 36

Certicates, declarations, and approvals 37

Online support 38

Case controller, type EKC 223 and EKC 224

Introduction

Application

EKC 223/224 are multipurpose refrigeration controllers designed to fulll today’s requirement of food retail

refrigeration applications. This controller is suitable for high, medium, and low temperature cabinets and cold

rooms with natural, electrical, or hot gas defrost.

Principle

The EKC 223/224 controls the temperature in the cabinet based on the measurement from a single sensor – Sair.

This sensor can be placed in the cold airow after the evaporator or in the warm airow before the evaporator,

depending on the construction and usage of the cabinet. A measurement of the defrost temperature can be

obtained using an S5 evaporator sensor or indirectly by using the Sair measurement.

Figure 1: Typical plug-in application with EKC 223/224

Sair

Danfoss

80G8429

EKC 223/224 controllers come with four push buttons, a big display, easy and intuitive menu structure, and pre-

dened applications ensure ease of use. Controller is loaded with energy eciency features like smart evaporator

fan management, day/night mode and defrosts on demand features.

Advantages

• Several applications in same unit

• Quick setup for fast commissioning

• Digital inputs for various functions

• Control of compressor or liquid line solenoid valve

• High Eect 16 A relay enable direct connection of heavy loads without use of intermediate relay: up to 2 hp

compressors depending on its power factor and motor eciency

• Alarm monitoring of condenser temperature with compressor stop protection

• Easy to integrate into Danfoss network systems via RS-485 adapter (EKA 206)

• Accurate temperature measurements

System overview

The EKC 223/224 controllers have a TTL port on the rear side of the controller and this TTL port allows the controller

to be connected to various interfaces.

Case controller, type EKC 223 and EKC 224

Figure 2: System interfaces of EKC 223/224

MPK

EKC 223, 224

System Manager

KoolKey

KoolProg

Danfoss

80G8445

SET V

RS-485 adapter (EKA 206)

The RS-485 adapter (EKA 206) adapter allows to integrate the controller on a Modbus eldbus. The controller is

supported by the following Danfoss front ends:

• AK-SM 720 system manager

• AK-SM 800 system manager

• AK-SM 800A system manager

The KoolKey (EKA 200) allows to connect the EKC controllers to the PC application named “KoolProg”. Via KoolProg it

is possible to perform on-line and o-line programming of the EKC controllers. It can also perform production line

programming of multiple controllers and show on-line trend curves on selected parameters.

Finally “KoolProg” can also load controller setup les into the MPK - Mass Programming Key (EKA 201) which can be

used for simple production line programming of EKC controllers.

Please refer to the KoolProg®User Guide for detailed instructions on how to use KoolProg®. Download KoolProg®at:

http://koolprog.danfoss.com. Refer to the installation guides of KoolKey (EKA 200) and Mass Programming Key (EKA

201) for further details on how to interface and use these modules.

Case controller, type EKC 223 and EKC 224

Functions

Temperature sensors

One thermostat sensor – Sair – can be connected to the controller, and the relevant application denes the

placement. It can be placed in the air ow before the evaporator or in the air ow after the evaporator. The latter is

mainly used where there is a risk of too low temperature at the products.

Figure 3: Refrigerated cabinet shown with sensor positions

Danfoss

80G8430

Sair

Defrost sensor

The best signal concerning the evaporator’s temperature is obtained from a S5 defrost sensor mounted directly on

the evaporator. Here the signal may be used by the defrost function, so that the shortest and most energy-saving

defrost can take place. If a defrost sensor is not required, defrost can be stopped based on time, or Sair can be

selected.

Condenser temperature sensor

A condenser temperature sensor – Sc – can be used for monitoring the temperature on the condenser. Depending

on settings, alarms can be generated, and a safety stop of the compressor, can be initiated based on this

temperature.

Voltage protection

The voltage protection ensures that the compressor motor is operating within safe voltage ranges. If the power

supply voltage gets outside the specied high/low voltage cut-out ranges, the compressor is cut-out or restricted

from starting. Normal compressor operation is resumed when the power supply voltage is back in the area between

the high voltage cut-out limit and the low voltage cut-in limit.

Figure 4: Voltage protection

High voltage cut-out

limit (alarm and

compressor stop)

Low voltage cut-in

limit (compressor start)

Low voltage cut-out

limit (alarm and

compressor stop)

Danfoss

80G8457

Condenser temperature monitoring

If the condenser is blocking up with dirt and thereby reaches a too high condensing temperature, the controller will

give the user early warning through condenser alarm and if temperature rises further, it will switch the compressor

OFF. If the temperature measured by the condenser sensor (Sc) is reaching the set “pre-alarm limit” an alarm is

raised, but no further action is taken.

Case controller, type EKC 223 and EKC 224

This is used to indicate to the user that something is wrong with the condenser. Often the reason is that that the air

ow to the condenser is restricted (dirt) or because the condenser fan is broken. The alarm will reset if the

condenser temperature drops back by 5 °C. If the measured condenser temperature continues to increase and

reaches the set “Block limit” the compressor is stopped, and it is restricted from starting again until the alarm is reset

manually. The alarm can be reset manually by setting the parameter r12 Main switch to OFF position and back to ON

position or by powering the controller down.

Figure 5: Compressor protection against high condensing

temperature

Sc temperature °C

Manual reset

Block limit

Pre alarm limit

Pre alarm OK

Compressor

Pre alarm

Block alarm

T1 T2 T3 T4

Danfoss

80G8376

Change of temperature reference

In an impulse appliance, for example, used for various product groups the temperature reference is changed easily

with a contact signal on a digital input. The signal changes the normal thermostat setpoint by a predened value. At

the same time the high and low alarm limits will be displaced with the same value.

Figure 6: Change of temperature reference

Danfoss

84B2490

5 °C

2 °C

Night setback

The thermostat reference can be displaced with an oset at night. The alarm limits will not be displaced at night

operation.

Figure 7: Night setback

Case controller, type EKC 223 and EKC 224

Digital inputs

There are two digital inputs, DI1 and DI2, with dry contact function.

They can be used for the following functions:

• Status readout

• Door function with stop of cooling and door alarm

• Door alarm only

• Main switch (start/stop of cooling)

• Night setback

• Reference oset

• External alarm

• Defrost start

• Pulldown cycle

• Sc condenser sensor (only DI1)

Figure 8: Digital inputs

Danfoss

84b2491

Door contact function

In cold rooms and frost rooms the door switch can switch the light on and o, start and stop the refrigeration and

give alarm if the door has remained open for too long.

Danfoss

84B2460

Defrost

Depending on the application, you may choose between the following defrost methods:

•Natural: Here the fans are kept operating during defrost

•Electric: The heating element is activated during active defrost

•Hot gas: The defrost output is used to control a solenoid that lets the hot gas ow through the evaporator. The

compressor is kept running to generate hot gas.

Start of defrost

A defrost can be started in dierent ways:

•Interval: Defrost is started at xed time intervals, e.g., every eighth hour

•Compressor runtime: Defrost is started at xed compressor runtime intervals. In other words, a low need for

refrigeration will “postpone” the coming defrost.

•Contact: Defrost is started with a contact signal on a digital input.

•Network: The signal for defrost is received from a system unit via the data communication.

•Defrost on demand: In 1:1 system the eciency of the evaporator can be followed. Icing-up will start a defrost.

•Manual: An extra defrost can be activated from the controller’s lower-most button (though not for application 4).

All the mentioned methods can be used at random – if just one of them is activated a defrost will be started.

Figure 9: Start of defrost

Case controller, type EKC 223 and EKC 224

Coordinated defrost via network

A coordinated defrost among multiple controllers can be obtained via data communication. The controllers will

have to be added to a coordinated defrost group in the AK-SM system manager. When a defrost cycle is scheduled

the system manager will start a defrost in all controllers. After the defrost, the individual controllers will move into

waiting position. When all controllers have terminated the defrost all controllers will continue with the rest of the

defrost cycle (drip delay and fan delay).

Figure 10: Coordinated defrost

Gateway/

System Manager

Danfoss

84B2453

Defrost on demand

1. Based on compressor runtime: when the aggregate compressor runtime has passed a set time, a defrost will be

started.

Figure 11: Based on compressor runtime

Danfoss

80G8459

Defrost start

Σt

2. Based on temperature: the controller will constantly follow the temperature at S5. Between two defrosts, the S5

temperature at compressor cut-out will become lower the more the evaporator ices up (the compressor operates for

a longer time and pulls the S5 temperature further down). When the S5 temperature passes a set allowed dierence,

compared to the set thermostat cut-out value the defrost will be started. This function can only work in 1:1 system.

Figure 12: Based on temperature

Danfoss

80G8458

Defrost start

Case controller, type EKC 223 and EKC 224

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