Emerson Dixell XRB06CH, Dixell XRB07CH Installing And Operating Instructions

DIGITAL CONTROLLERS WITH

ENERGY SAVING MANAGEMENT

XRB06CH AND XRB07CH

1 GENERAL WARNINGS.............................................................................................................. 1

2 GENERAL DESCRIPTION ......................................................................................................... 1

3 REGULATION ........................................................................................................................... 1

4 AUTOMATIC SUPER COOLING FUNCTION ............................................................................. 1

5 DEFROST ................................................................................................................................. 1

6 FANS ........................................................................................................................................ 1

7 AUTOMATIC ENERGY SAVING FUNCTION.............................................................................. 1

8 FRONT PANEL COMMANDS .................................................................................................... 1

9 PARAMETERS .......................................................................................................................... 2

10 DIGITAL INPUTS ....................................................................................................................... 3

11 INSTALLATION AND MOUNTING.............................................................................................. 3

12 ELECTRICAL CONNECTIONS .................................................................................................. 3

13 USE THE HOT KEY ................................................................................................................... 4

14 ALARM SIGNALLING ................................................................................................................ 4

15 TECHNICAL DATA .................................................................................................................... 4

16 CONNECTIONS ........................................................................................................................ 4

17 DEFAULT SETTING VALUES .................................................................................................... 4

1 GENERAL WARNINGS

1.1 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.

1.2 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.r.l.”

(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.

 Dixell Srl reserves the right to change the composition of its products, even without notice,

ensuring the same and unchanged functionality.

2 GENERAL DESCRIPTION

The XRB06CX, 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, lights or 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 control the ventilators. It is also
equipped with a couple of configurable digital inputs.
The XRB07CX has an additional configurable relay.
With the HOTKEY it’s possible to program the instrument in a quick and easy way.

3 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.

4 AUTOMATIC SUPER COOLING FUNCTION

This function is used to cool quickly the goods when the cabinet is filled.
Different parameters are used for this function depending on the working mode:
Normal mode will use: 1H, 1S and 1t
Energy Saving mode will use: 2H, 2S, 1t
Here below the parameter description:

- 1H, 2H overheating before activating the super cooling function: (0.0 to 12.0°C; 0 to 21°F) value
added to Set-Point to determine the start temperature of sub-cooling cycle.

- 1S, 2S Subcooling: (0.0 to 12.0°C; 0 to 21°F) value subtracted to Set-Point to determine the end
temperature of sub-cooling cycle.

- 1t maximum duration for super cooling function: 0 to 99 min

If the temperature is higher than SET+HY+1H or SET_ES+HYE+2H, the super cooling function starts and
the compressor is not stopped till the temperature is 1S or 2S degrees below the set point SET or
SET_ES. To disable this function set 1S, 2S=0.

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.

6.1 FANS CYCLICAL ACTIVATION WITH COMPRESSOR OFF

When FC=Cn or CY (fans in parallel to the compressor), by means of the Fn and FF parameters the fans
can carry out on and off cycles even if the compressor is switched off. When the compressor is stopped
the fans go on working for the Fn time. With Fn=0 the fans remain always off, when the compressor is
off.

6.2 FANS AND DIGITAL INPUT

When the digital input is configured as door switch (iF=do) fan 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 AUTOMATIC ENERGY SAVING FUNCTION

FROM TO CHANGED BY

Standard E.S.

E.S. Standard

NOTE: the cycles (ES → Standard mode → ES ….) are always operating with iF or 2F=do and Et and
St different from zero.

With Et or St=0 the controller doesn’t change the operating mode, and it’s possible to pass from the
standard mode to E.S. by using the ECO button or with iF or 2F=ES.

Note: the energy saving status is saved in EEPROM to resume previous operation if a power failure
occurs.

- Push the ECO button

- Door continuously closed for the Et time

- Push the ECO button

- Controller in ES mode for the St time

- If the controller is in ES and the door is open more than do time,
the controller restart standard set point.

8 FRONT PANEL COMMANDS

To display target set point, in programming mode it selects a parameter or
confirm an operation.

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+

+

+

ECO (ECO) for light or energy saving mode activation/deactivation

(UP) In programming mode it browses the parameter codes or increases
the displayed value.

(DOWN/OFF) In programming mode it browses the parameter codes or

ONOFF

KEYS COMBINATION

LED MODE SIGNIFICATO

ECO On Energy Saving mode active

decreases the displayed value.
Keep it pressed for 3 sec for ON/OFF mode.

On Compressor running

Flashing Anti-short cycle delay enabled (AC parameter).

On Fans output enabled

Flashing Fans delay after defrost

On Measurement unit

Flashing Programming mode

On Measurement unit

Flashing Programming mode

To lock or unlock the keyboard
To enter in programming mode
To return to room temperature display

8.1 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 for 3 sec to return to normal visualisation.

8.2 HOW TO CHANGE THE SETPOINT

1. Push the SET key for more than 3 sec 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 UP or DOWN arrows.

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

8.3 HOW TO START A MANUAL DEFROST

A configurable button needs to be set as dE to activate the manual defrost control function. After that,
keep the DEF button pressed for the required time (immediate or 3 sec if timed) in order to activate a
defrost.

8.4 HOW TO CHANGE A PARAMETER VALUE

To change any parameter value, operate as follows:

1. Enter the Programming mode by pressing the SET+DOWN keys for 3 sec (“°C” or “°F” LED starts
blinking).

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

3. Use UP or DOWN to change its value.

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

To exit: Press SET+ UP or wait for 15 sec without pressing any key.
NOTE: the set value is stored even when the procedure is terminated by waiting for the time-out to

expire.

8.5 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+DOWN keys for 3 sec (“°C” or “°F” LED starts
blinking).

2. Released the keys and then push again the SET+DOWN keys for more than 7 sec. 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 UP or DOWN to change its value.

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

To exit: Press SET+ UP or wait for 15 sec without pressing any key.
NOTE1: if there are no parameters in L1, after 3 sec the “nP” message will be displayed. Keep both keys

pushed till the “L2” message will be displayed.
NOTE2: the set value is stored even when the procedure is terminated by waiting for 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+DOWN. In HIDDEN MENU when a parameter is present in First Level the
decimal point is on.

8.6 TO LOCK THE KEYBOARD

1. Keep pressed for more than 3 sec the UP and DOWN keys.

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

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

8.7 TO UNLOCK THE KEYBOARD

Keep both UP and DOWN key pressed more than 3 sec until the “on” message will be displayed.

9 PARAMETERS

REGULATION

HY Differential in standard mode: (0.1 to 25°C; 1 to 45°F) differential for set point used in normal

mode. Compressor Cut IN is SET+HY. Compressor Cut OUT is when the temperature reaches
the set point SET.

HE Differential in energy saving mode: (0.1 to 25°C; 1 to 45°F) differential for set point used in

energy saving mode. Compressor Cut IN is SET_ES+HE. Compressor Cut OUT is when the
temperature reaches the set point SET_ES.

LS Minimum SET POINT: (-55°C to SET; -67°F to SET) sets the minimum value for the set point.
US Maximum SET POINT: (SET to 99°C; SET to 99°F) set the maximum value for set point.
ot First probe calibration: (-9.9 to 9.9°C; -17 to 17°F) allows to adjust possible offset of the first

probe.
P2 Evaporator probe presence: (n; Y) n=not present; Y=probe configured as present.
oE Second probe calibration: (-9.9 to 9.9°C; -17 to 17°F) allows to adjust possible offset of the

second probe.
P3 Third probe presence: (n; Y) n=not present; Y=probe configured as present.
F3 Third probe calibration: (-9.9 to 9.9°C; -17 to 17°F) allows to adjust possible offset of the

second probe.
od Outputs activation delay at start up: (0 to 99 min) this function is enabled at the initial start-

up of the instrument and inhibits any output activation for the period set in the parameter.
AC Anti-short cycle delay: (0 to 99 min) minimum interval between the compressor stop and the

following restart.
CY Compressor ON time with faulty probe: (0 to 99min) time during which the compressor is

active in case of faulty thermostat probe. With CY=0 compressor is always OFF.
Cn Compressor OFF time with faulty probe: (0 to 99min) time during which the compressor is

OFF in case of faulty thermostat probe. With Cn=0 compressor is always active.

DISPLAY

CF Measurement unit: (°C; °F) °C=Celsius; °F=Fahrenheit. WARNING: When the

measurement unit is changed the SET point and the values of the parameters Hy, LS, US, oE,
o1, AU, AL have to be checked and modified if necessary.

rE Resolution (only for °C): (dE; in) dE=decimal between -9.9 and 9.9°C; in=integer.
Ld Default display: (P1; P2; P3; P4; SP; dr) P1=thermostat probe; P2=evaporator probe;

P3=third probe; P4=not used; SP=Set point; dr=not used.

dy Display delay: (0 to 99 min) when the temperature increases, the display is updated of 1°C

or 1°F after this time.

DEFROST

td Defrost type: (EL; in) EL= electrical heater, compressor OFF; in=hot gas, compressor ON.
EA Automatic defrost: (n; Y) n=function disabled; Y=a defrost is automatically activated at the

beginning of any energy saving period.

PE Probe selection for first defrost: (nP; P1; P2; P3; P4) nP=not used, defrost ends by time;

P1=thermostat probe; P2=evaporator probe; P3=third probe; P4=not used.

dE Defrost termination temperature: (-55 to 50°C; -67 to 99°F) if P2=Y, this is the temperature

measured by the evaporator probe which causes the end of defrost.

id Interval between defrost cycles: (0 to 99 min) determines the time interval between two

consecutives defrosts cycles.

Md Maximum duration for first defrost: (0 to 99min, 0 means no defrost) when P2=n, (no

evaporator probe present, the defrost is) it sets the defrost duration, when P2=y (defrost end
based on temperature) it sets the maximum length for defrost.

dd Start defrosts delay: (0 to 99min) this is useful when different defrost start times are

necessary to avoid overloading the plant.

dF Display during defrost: (rt; it; SP; dF) rt=real temperature; it=start defrost temperature;

SP=SET-POINT; dF=label dF.
tA Delay for temperature visualization after defrost: 0 to 99 min.
dt Drip time: (0 to 99min) time interval between reaching defrost termination temperature and

the restoring of the control’s normal operation. This time allows the evaporator to eliminate

water drops that might have formed due to defrost.

FANS

FC Fans operating mode: (cn, on, cY, oY) cn=in runs with the compressor, OFF during defrost;

on=continuous mode, OFF during defrost; cY=runs with the compressor, ON during defrost;

oY=continuous mode, ON during defrost.
Fd Fans delay after defrost: (0 to 99 min) Interval between the end of a defrost operation and

the next evaporator fans start.

Ft Temperature differential for forced activation of fans: 0 to 50°C; 0 to 90°F.
FS Fans stop temperature: (-55 to 50°C; -67 to 99°F) setting of temperature, detected by

evaporator probe, above which fans are always OFF.
Fn Fan ON time: (0 to 15 min) with FC=Cn or CY, (fan activated in parallel with compressor). It

sets the evaporator fan ON cycling time when the compressor is off. With Fn=0 and FF≠0 the

fan are always off, with Fn=0 and FF=0 the fan are always off.
FF Fan OFF time: (0 to 15 min) with FC=Cn or CY, (fan activated in parallel with compressor). It

sets the evaporator fan off cycling time when the compressor is off. With Fn=0 and FF≠0 the

fan are always off, with Fn=0 and FF=0 the fan are always off.

FP Probe selection for fan management: nP = fan regulator is disabled; P1 = thermostat probe;

P2 = evaporator probe; P3 =configurable probe; P4 = Probe on Hot Key plug.

ALARMS

CA Temperature alarms configuration: (Ab; rE) Ab = absolute temperature: alarm temperature

is given by the AL or AU values. rE = temperature alarms are referred to the set point.

Temperature alarm is enabled when the temperature exceeds the SET+AU or SET-AL

values.
AU Maximum temperature alarm: (AL to 99°C; AL to 99°F) when this temperature is reached

the alarm is enabled, after the Ad delay time.
AL Minimum temperature alarm: (-55°C to AU; -67°F to AU) when this temperature is reached

the alarm is enabled, after the Ad delay time.
FH Differential for temperature alarm recovery: (0.1 to 25.5°C; 1 to 45°F) differential for

temperature alarm recovery. It’s also used for the restart of the fan when the FS temperature

is reached.

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