Operating Manual

1/3

DIGITAL CONTROLLER WITH DEFROST AND

FANS MANAGEMENT

XR06CX

1. CONTENTS

Contents____________________________________________________________________________ 1

General warnings _____________________________________________________________________ 1

General description ___________________________________________________________________ 1

Regulation __________________________________________________________________________ 1

Defrost _____________________________________________________________________________ 1

Fans _______________________________________________________________________________ 1

Front panel commands ________________________________________________________________ 1

Parameters__________________________________________________________________________ 2

Digital inputs (ONLY XR03CX) __________________________________________________________ 2

10.

Installation and mounting _______________________________________________________________ 2

11.

Electrical connections _________________________________________________________________ 2

12. How to use the hot key_________________________________________________________________ 2

13.

Alarm signalling ______________________________________________________________________ 2

14.

Technical data _______________________________________________________________________ 2

15.

Connections _________________________________________________________________________ 3

16.

Default setting values__________________________________________________________________ 3

2. GENERAL WARNINGS

PLEASE READ BEFORE USING THIS MANUAL

• This manual is part of the product and should be kept near the instrument for easy and quick

reference.

• The instrument shall not be used for purposes different from those described hereunder. It cannot be

used as a safety device.

• Check the application limits before proceeding.

SAFETY PRECAUTIONS

• Check the supply voltage is correct before connecting the instrument.

• Do not expose to water or moisture: use the controller only within the operating limits avoiding sudden

temperature changes with high atmospheric humidity to prevent formation of condensation

• Warning: disconnect all electrical connections before any kind of maintenance.

• Fit the probe where it is not accessible by the End User. The instrument must not be opened.

• In case of failure or faulty operation send the instrument back to the distributor or to “Dixell S.p.A.” (see

address) with a detailed description of the fault.

• Consider the maximum current which can be applied to each relay (see Technical Data).

• Ensure that the wires for probes, loads and the power supply are separated and far enough from each

other, without crossing or intertwining.

• In case of applications in industrial environments, the use of mains filters (our mod. FT1) in parallel with

inductive loads could be useful.

3. GENERAL DESCRIPTION

The XR06CX, format 32 x 74 x 60 mm, is microprocessor based controller, suitable for applications

on medium or low temperature ventilated refrigerating units. It has three relay outputs to control

compressor, fan, and defrost which can be either electrical or reverse cycle (hot gas). The device is

also provided with 2 NTC probe inputs, the first one for temperature control and the second one to be

located onto the evaporator, to control the defrost termination temperature and to managed the fan

and it’s provided with a configurable digital input. With the HOTKEY it’s possible to program the

instrument in a quick and easy way.

4. REGULATION

The regulation is performed according to

the temperature measured by the

thermostat probe with a positive

differential from the set point: if the

temperature increases and reaches set

point plus differential the compressor is

started and then turned off when the

temperature reaches the set point value

again.

In case of fault in the thermostat probe the start and stop of the compressor are timed through

parameters “Cy” and “Cn”.

5. DEFROST

Two defrost modes are available through the “td” parameter:

• td=EL → defrost through electrical heater (compressor OFF)

• td=in → hot gas defrost (compressor ON).

Other parameters are used to control the interval between defrost cycles (id) ), its maximum length

(Md) and two defrost modes: timed or controlled by the evaporator’s probe. At the end of defrost

dripping time is started, its length is set in the dt parameter. With dt=0 the dripping time is disabled.

6. FANS

With FC parameter it can be selected the fans functioning:

• FC=cn → will switch ON and OFF with the compressor and not run during defrost

• FC=on → fans will run even if the compressor is off, and not run during defrost

After defrost, there is a timed fan delay allowing for drip time, set by means of the “Fd” parameter.

• FC=cy → fans will switch ON and OFF with the compressor and run during defrost

• FC=oY → fans will run continuously also during defrost.

An additional parameter “FS” provides the setting of temperature, detected by the evaporator probe,

above which the fans are always OFF. This is used to make sure circulation of air only if his

temperature is lower than set in “FS”

FANS AND DIGITAL INPUT

When the digital input is configured as door switch iF=do, fans and compressor status depends on the

dC parameter value:

• dC=no → normal regulation;

• dC=Fn → fans OFF;

• dC=cP → compressor OFF;

• dC=Fc → compressor and fans OFF.

When rd=y, the regulation restart with door open alarm.

7. FRONT PANEL COMMANDS

To display target set point, in

programming mode it selects a

parameter or confirm an

operation

To start a manual defrost

In programming mode it browses

the parameter codes or increases

the displayed value

AUX

In programming mode it browses

the parameter codes or

decreases the displayed value

KEYS COMBINATION

To lock or unlock the keyboard

To enter in programming mode

To return to room temperature display

LED MODE SIGNIFICATO

On Compressor enabled

Flashing Anti short cycle delay enabled (AC parameter)

On Defrost in progress

Flashing Dripping in progress

On Fans output enabled

Flashing Fans delay after defrost

On Measurement unit

Flashing Programming mode

On Measurement unit

Flashing Programming mode

HOW TO SEE THE SET POINT

1. Push and immediately release the SET key, the set point will be showed;

2. Push and immediately release the SET key or wait about 5s to return to normal visualisation.

HOW TO CHANGE THE SETPOINT

1. Push the SET key for more than 2 seconds to change the Set point value;

2. The value of the set point will be displayed and the “°C” or “°F” LED starts blinking;

3. To change the Set value push the or arrows.

4. To memorise the new set point value push the SET key again or wait 10s.

HOW TO START A MANUAL DEFROST

Push the DEF

key for more than 2 seconds and a manual defrost will start

HOW TO CHANGE A PARAMETER VALUE

To change the parameter’s value operate as follows:

1. Enter the Programming mode by pressing the SET+ keys for 3s (“°C” or “°F”

LED starts

blinking).

2. Select the required parameter. Press the “SET” key to display its value

3. Use or to change its value.

4. Press “SET” to store the new value and move to the following parameter.

To exit: Press SET+ or wait 15s without pressing a key.

NOTE: the set value is stored even when the procedure is exited by waiting the time-out to expire.

HIDDEN MENU

The hidden menu includes all the parameters of the instrument.

HOW TO ENTER THE HIDDEN MENU

1. Enter the Programming mode by pressing the SET+

keys for 3s (“°C” or “°F”

LED starts

blinking).

2. Released the keys, then push again the SET+ keys for more than 7s. The L2 label will be

displayed immediately followed from the Hy parameter.

NOW YOU ARE IN THE HIDDEN MENU.

3. Select the required parameter.

4. Press the “SET” key to display its value

5. Use

or to change its value.

6. Press “SET” to store the new value and move to the following parameter.

To exit: Press SET+ or wait 15s without pressing a key.

NOTE1: if there aren’t any parameter in L1, after 3s the “nP” message is displayed. Keep the keys

pushed till the L2 message is displayed.

NOTE2: the set value is stored even when the procedure is exited by waiting the time-out to expire.

HOW TO MOVE A PARAMETER FROM THE HIDDEN MENU TO THE FIRST

LEVEL AND VICEVERSA.

Each parameter present in the HIDDEN MENU can be removed or put into “THE FIRST LEVEL” (user

level) by pressing SET+ . In HIDDEN MENU when a parameter is present in First Level the decimal

point is on.

TO LOCK THE KEYBOARD

1. Keep pressed for more than 3s the and keys.

2. The “OF” message will be displayed and the keyboard will be locked. If a key is pressed more

than 3s the “OF” message will be displayed.

TO UNLOCK THE KEYBOARD

Keep pressed together for more than 3s the and keys till the “on” message will be displayed.

dixell XR06CX - Page 76

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