Danfoss EKC 414A User Manual

REFRIGERATION AND AIR CONDITIONING

ADAP-KOOL

®

Refrigeration control systems

Controller for controlling one evaporator

EKC 414A

Manual

Refrigeration and Air Conditioning Controls

2 Manual RS.8C.K3.02 © Danfoss 09-2003 EKC 414A

Introduction

Application

The controller is a complete control unit for refrigeration
appliances with integrated refrigeration-technical functions
capable of replacing a setup of thermostats and timers.

The relays are used for operating:

- Compressor

- Fan

- defrost

- Alarm

- Light

The controller can operate one evaporator.

The intended placing of the controller is “on/near the
refrigeration appliance” and the controller is therefore
provided with plugs at the sensor connection points. All
sensors used must therefore be fitted with a belonging plug.

Operation

The controller comes without operating buttons on the front
panel, and it will require no operation once it has been set
and started up.
When the controller is operated, it can be done in one of the
following ways:

• Connection of an external display with operating buttons

- The display will currently show measurements and settings
in the menu system

- In case of malfunction the relevant error code will be
shown on the display

- Four light-emitting diodes will show the system’s actual
function:
› refrigeration
› power for the AKV valve
› defrost
› fan operating
› when there is an alarm the three LED’s will flash

• Data communication
The controller can be hooked up with other products in the
series of ADAP-KOOL® refrigeration controls. The
operation, monitoring and data collection can then be
performed from a PC – either on site or at a service
company.

Customer display

If the temperature in the appliance is to be visible to, say,
customers, a display can be mounted.

Inject ON function

The expansion valve closes when the signal at the 230V input
is removed or receives a signal via the data communication.
In this way it is ensured that the expansion valve will not
charge the evaporator when the compressor has stopped.
(The threading of the function may be cancelled via a
setting).

Digital input

A digital input can be defined for one of the following applica­tions:
Door alarm
Defrost start
Night operation
Start/stop of regulation
Joint defrost start/stop with a master/slave function

Data communication

The controller is provided with LON RS 485 data communica­tion. More about this data communication on page 18.

EKC 414A Manual RS.8C.K3.02 © Danfoss 09-2003 3

Function

Liquid supply

The supply of liquid is controlled on the basis of signals from
the pressure transmitter, temperature sensor S2 and the air
temperature. The sensors create a signal so that the
superheat is continuously kept at a minimum whatever the
operating conditions.

The AKV valve functions both as expansion valve and
solenoid valve. The valve opens and closes based on signals
from the controller.

Temperature control

The temperature is controlled on the basis of signals from one
or two temperature sensors. If there is only one sensor it may
optionally be placed in the air before or after the evaporator. If
there are two sensors, one must be placed before and one
after the evaporator. With a setting it is subsequently defined
how large an influence the individual sensor is to have on the
control. The actual temperature control can take place in two
ways: as an ordinary ON/OFF regulation with a belonging
differential, or as a modulating control there the temperature
variation will not be nearly as great as in ON/OFF control.
There is however a limit to the use of them as a modulating
control can only be used in central plant. In a decentralised
plant the thermostat function with ON/OFF control should be
selected.
In a central plant the thermostat function may either be
selected for ON/OFF control or modulating control.

Defrost

With a simple function defrost can be started x times per day
and night. But the controller may also receive a signal from a
defrost clock or from another unit via the data communication,
so that defrost will take place at defined times of the day or
night.
An on-going defrost can be stopped based on temperature,
normally the one measured with the S5 sensor, or it may be
stopped based on time. A combination with stop based on
temperature and with the time factor as a precautionary
measure is also a possibility.

Clock module (accessory)

If the controller is mounted without data communication and
defrost has to be carried out at specific times, a clock
module can be mounted.
The controller comes prepared with plug and terminals so
that the module just has to be pushed in.
Subsequently, up to six defrosts per day can be set. The
module has battery back-up.

On / Off control

Modulating control

4 Manual RS.8C.K3.02 © Danfoss 09-2003 EKC 414A

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03otnaregirfeR

10 Manual RS.8C.K3.02 © Danfoss 09-2003 EKC 414A

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EKC 414A Manual RS.8C.K3.02 © Danfoss 09-2003 11

mralarooD 4AmralarooD

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12 Manual RS.8C.K3.02 © Danfoss 09-2003 EKC 414A

Connection

Cable length between an external display and EKC 414A must be max. 15 m

Coordinated defrost via cable connections

Coordinated defrost via data communication

12 4 12 412 4

AKS 32R:
1= Black
2= Blue
3= Brown

EKC 414A Manual RS.8C.K3.02 © Danfoss 09-2003 13

Necessary connections

11 - 12 Pt 1000 ohm sensor. Refrigeration outlet (S2)
13 - 14 Air temperature sensor before evaporator (S3)
15 - 16 Air temperature sensor after evaporator (S4)

It is application determined whether S3 or S4 or both
has to be mounted.

S3, S4 and S5 may either be Pt 1000 ohm or Ptc
1000 ohm, but they must all be of the same type.

20 - 22 Signal from pressure transmitter type AKS 32R
23 - 24 Supply voltage 230 V 50/60 Hz
25, 26 Protective earth connection
27 - 28 Expansion valve type AKV (230 V d.c.)
40 - 41 230 V signal for start/stop of regulation

(the connection can be left out with setting in o29).

Application dependent connections

1 - 2 Output signal on terminal 2, if there is coordinated

defrost with cable connections

3 - 4 Input signal from a contact function or signal on

terminal 4, if there is coordinated defrost with cable
connections

5 - 7 Possibility of connecting an external display type EKA

161

8 - 10 Possibility of connecting an external display with

operating knobs type EKA 162

17 -18 Defrost sensor on the evaporator (S5). (The sensor

can either be Pt 1000 ohm or Ptc 1000 ohm)

29 - 31 Alarm relay

There is connection between 29 and 31 in alarm

situations and when the controller is de-energised
32 - 33 Compressor relay
34 - 35 Defrost relay
36 - 37 Fan relay
38 - 39 Light relay

There is connection between 38 and 39

when control performed during day operation
43 - 44 Data communication

It is

important that the installation of the data commu­nication cable be done correctly. Cf. separate
literature No. RC.8A.C...
Gateway AKA 243B must be version 5.3x or newer
version.
The wire switch to the left of terminal 43 will termi­nate with 120 ohm in closed position.

Installation considerations

Accidental damage, poor installation, or site conditions, can
give rise to malfunctions of the control system, and ultimately
lead to a plant breakdown.

Every possible safeguard is incorporated into our products to
prevent this. However, a wrong installation, for example,
could still present problems. Electronic controls are no
substitute for normal, good engineering practice.

Danfoss wil not be responsible for any goods, or plant
components, damaged as a result of the above defects. It is
the installer's responsibility to check the installation thor­oughly, and to fit the necessary safety devices.

Special reference is made to the necessity of signals to the
controller when the compressor is stopped and to the need
of liquid receivers before the compressors.

Your local Danfoss agent will be pleased to assist with further
advice, etc.

Plug

The controller comes factory-mounted with one part of a
plug connection. The other part is of the type Phoenix
and AMP with the following type designations:
ConnectionType
1-2: MC1,5/2-ST-3,81
3-4: ""
Display: AMP ital mod 2, housing 280 359,

crimp contact 280 708-2
Display: ""
S2: AMP ital mod 2, housing 280 358,

crimp contact 280 708-2
S3: ""
S4: ""
S5: ""
20-22: MC1,5/3-ST-3,81
23-25: MSTBT2,5/3-ST-5,08
26-28: ""
29-31: ""
32-33: MSTBT2,5/2-ST-5,08
34-35: ""
36-37: ""
38-39: ""
40-41: MC1,5/2-ST1-5,08
43-44: MC1,5/2-ST-3,81

The screw terminals (Phoenix plug) are not bypacked for some of
the code numbers.
Sensors and display supplied with plug.

14 Manual RS.8C.K3.02 © Danfoss 09-2003 EKC 414A

Operation of the controller can take
place via data communication or from a
separate display. Operation via data
communication may be performed via
the AKM programme and a text that
can be seen in the earlier section
”Survey of functions”. Operation from
EKA 162 is described below:

EKA 162

Operation

The buttons (EKA 162 only)

When you want to change a setting, the
two buttons will give you a higher or
lower value depending on the button
you are pushing. But before you change
the value, you must have access to the
menu. You obtain this by pushing the
upper button for a couple of seconds ­you will then enter the column with
parameter codes. Find the parameter
code you want to change and push the
two buttons simultaneously. When you
have changed the value, save the new
value by once more pushing the two
buttons simultaneously.
Or briefly:

Gives access to the menu (or
cutout an alarm)

Gives access to changes

Saves a change

Or examples put in another way:

Set the temperature

1. Push the two buttons simultaneously

2. Push one of the buttons and select
the new value

3. Push both buttons again to conclude
the setting

Set a menu

1. Push the upper button until a
parameter is shown

2. Push one of the buttons and find the

parameter you want to change

3. Push both buttons simultaneously

until the parameter value is shown

4. Push one of the buttons and select
the new value

5. Push both buttons again to conclude
the setting

Examples of displays:

-d- Display going on

180 Sensor has not been mounted

Temperature setting

When it is the temperature setting you
wish to change, do not enter the menu.
Push both buttons simultaneously and
you will be allowed to change the
temperature reference when the display
answers back by flashing.

Forced control

In addition to the normal way of operat­ing the controller you are now able to
perform a number of forced control
functions which you start, as follows:

- Cut out alarm relay / check alarm code

• Push the upper button

- Read the defrost stop temperature

• Push the lower button

- Manual start or stop of defrost

• Push the lower button for four
seconds

EKA 161

Display with
operating buttons
and LED indication
of relay functions:

Refrigeration

AKV valve

Defrost

Fan

Display for
mounting on
refrigeration
appliance.

The showing in
the display
follows the
showing in
EKA 162

Examples of operations

Operating the two pushbuttons

Display

readout

What the controller does automatically

Resulting
controller

setup

Normal

operation

Room

temp. 2

Normal
operation
(or alarm)

Known

codes

and settings

All parameter

settings

= factory

settings

Normal
operation

Normal
operation

Normal
operation

Alarm relay

not

activated

Alarm

Room
temp.

Room
temp.

Set

value

Change

ChangeChange

Set

value

Room
temp.

Room
temp.

Power off

Power

on

Room
temp.

Room

temp.

Room

temp.

Room

temp.

Room

temp.

Alarm code/

Fault code

Alarm code/

Fault code

Room temp.

Room temp.

Defrost operation

Defrost stop temp.

What
to do

Initial

controller

setup

Read

or

change

room
temp.

setting

Read
or change
parameter

codes

and

settings

Re-establish

all factory

settings

Read

defrost

stop

temp.

Manually

start of

a defrost

operation

Manually

stop of

a defrost

operation

Reset

alarm

relay

Read codes

cause of

alarm mode

Normal

operation

Room

temp. 1

Normal
operation
(or alarm)

Unknown

codes

and settings

Unknown

settings

Normal
operation

or alarm

Normal
operation

Defrost

operation

Alarm

relay

activated

Alarm relay

not

activated

Room
temp.

Room
temp.

Code

Room
temp.

Room
temp.

Room

temp.

Room
temp.

Room
temp.

Room
temp.

EKC 414A Manual RS.8C.K3.02 © Danfoss 09-2003 15

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03o0 03

SW: 1.7x

Menu survey

16 Manual RS.8C.K3.02 © Danfoss 09-2003 EKC 414A

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Factory setting
If you need to return to the factory-set values, it can be done in this way:

- Cut out the supply voltage to the controller

- Keep both buttons depressed at the same time as you reconnect the supply
voltage

EKC 414A Manual RS.8C.K3.02 © Danfoss 09-2003 17

Data

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Ordering

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Montage

Display type EKA 161 / 162

EKC 414A

IP 20

* AC 15 load acc. to EN 60947-5-1

References

When the unit is mounted on a wall,
the two points on the DIN fastening
are cut off.

Only for front mounting (IP 40)
Only connection via plugs

18 Manual RS.8C.K3.02 © Danfoss 09-2003 EKC 414A

Data communication

Example

This page contains a description of a few of the possibilities
you will have with data communication.

It is important that the installation of the data communication
cable is carried out correctly. Please refer to separate
literature No. RC.8A.C

The controller has been
prepared for data commu­nication.

The data communication
takes place via a two-core
twisted cable.

Up to 60 controllers may
be connected to one
cable.

This cable is also connected
to a gateway type AKA 243B.

This gateway will now
control the communication to
and from the controllers.

It will collect temperature
values and it will receive
alarms. When there is an
alarm the alarm relay will be
activated for two minutes.

The gateway can now be
connected to a modem.

When an alarm occurs from
one of the controllers, the
gateway will - via the modem

- make a phone call to the
service company.

At the service company a
modem, gateway and PC
with system software type
AKM have been installed.

All the controllers’ functions
can now be operated from
the various menu displays.

The programme will for
example upload all the
collected temperature values
once a day.

Example of menu display

• Measurements are shown

at one side and settings at
the other.

• You will also be able to see

the parameter names of
the functions on page 4-11.

• With a simple change-over
the values can also be
shown in a trend diagram.

• If you wish to check earlier
temperature measure­ments, you can see them
in the log collection.

Alarms

If the controller is extended
with data communication, it
will be possible to define the
importance of the transmit­ted alarms.
The importance is defined
with the setting: 1, 2, 3 or 0.
When the alarm then arises
at some time, it will result in
one of the following activi­ties:

1 = Alarm
The alarm message is sent
off with alarm status 1. This
means that the gateway with
address 125 in the system
will have its alarm relay
output activated for two
minutes. Later, when the
alarm ceases, the alarm text
will be retransmitted, but
now with status value 0.

2 = Message
The alarm text is transmitted
with status value 2. Later,
when the “message” lapses,
the alarm text is
retransmitted, but now with
status value 0.

3 = Alarm
As “1”, but the master
gateway’s relay output is not
activated.

0 = Suppressed information
The alarm text is stopped at
the controller. It is transmit­ted nowhere.

EKC 414A Manual RS.8C.K3.02 © Danfoss 09-2003 19

20 Manual RS.8C.K3.02 © Danfoss 09-2003 EKC 414A

List of literature

Instructions RI.8G.R

Here you can see how controllers are mounted and programmed.

Installation guide for extended operation RC.8A.C

Here you can see how a data communication connection to ADAP-KOOL® can be established.
Refrigeration controls with EKC LonWorks®.

Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to
products already on order provided that such alternations can be made without subsequential changes being necessary in specifications already agreed.
All trademarks in this material are property of the respecitve companies. Danfoss and Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.

RC-ET