Thermo Scientific Jewett Pass-Thru BBR25D-1B, Installation And Operations

dIXEL

Installing and Operating Instructions 

Digital controller with defrost and fans management

XR60CX 

CONTENTS 

1.

GENERAL WARNING ________________________________________________________ 1

2.

GENERAL DESCRIPTION ____________________________________________________ 1

3.

CONTROLLING LOADS ______________________________________________________ 1

4.

FRONT PANEL COMMANDS __________________________________________________ 1

5.

MAX & MIN TEMPERATURE MEMORIZATION____________________________________ 1

6.

MAIN FUNCTIONS __________________________________________________________ 2

7.

PARAMETERS _____________________________________________________________ 2

8.

DIGITAL INPUT (ENABLED WITH P3P = N) ______________________________________ 3

9.

TTL SERIAL LINE – FOR MONITORING SYSTEMS ________________________________ 3

10.

X-REP OUTPUT – OPTIONAL _________________________________________________ 3

11.

INSTALLATION AND MOUNTING ______________________________________________ 3

12.

ELECTRICAL CONNECTIONS _________________________________________________ 3

13.

HOW TO USE THE HOT KEY__________________________________________________ 3

14.

ALARM SIGNALS ___________________________________________________________ 3

15.

TECHNICAL DATA __________________________________________________________ 4

16.

CONNECTIONS_____________________________________________________________ 4

17.

DEFAULT SETTING VALUES__________________________________________________ 4

1.

GENERAL WARNING 

1.1

PLEASE READ BEFORE USING THIS MANUAL 

x

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

x

The instrument shall not be used for purposes different from those described hereunder. It 
cannot be used as a safety device. 

x

Check the application limits before proceeding. 

1.2

 SAFETY PRECAUTIONS 

x

Check the supply voltage is correct before connecting the instrument. 

x

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 

x

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

x

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

x

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. 

x

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

x

Ensure that the wires for probes, loads and the power supply are separated and far enough 
from each other, without crossing or intertwining. 

x

In case of applications in industrial environments, the use of mains filters (our mod. FT1) in 
parallel with inductive loads could be useful. 

2.

GENERAL DESCRIPTION 

Model 

XR60CX

, format 32 x 74 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). It is also 
provided with three NTC or PTC probe inputs, the first one for temperature control, the second one, 
to be located onto the evaporator, to control the defrost termination temperature and to managed the 
fan, the third one, optional, to connect to the HOT KEY terminals to signal the condenser 
temperature alarm or to display a temperature. The digital input can operate as fourth temperature 
probe. 
The HOT KEY output allows to connect the unit, by means of the external module XJ485-CX,  to a 
network line 

ModBUS-RTU

 compatible such as the 

dIXEL 

monitoring units  of X-WEB family. It 

allows to program the controller by means the HOT KEY programming  keyboard.  
The instrument is fully configurable through special parameters that can be easily programmed 
through the keyboard. 

3.

CONTROLLING LOADS 

3.1

COMPRESSOR 

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. 

Time

Temper.

Compr.

SET

ON

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

COn

” and “

COF

”. 

3.2

DEFROST 

Two defrost modes are available through the “

tdF

” parameter: defrost through electrical heater (

tdF 

= EL

) and hot gas  defrost (

tdF = in

). Other parameters are used to control the interval between 

defrost cycles (IdF), its maximum length (MdF) and two defrost modes: timed or controlled by the 
evaporator’s probe (P2P).  
At the end of defrost dripping time is started, its length is set in the FSt parameter. With FSt =0 the 
dripping time is disabled. 

3.3

CONTROL OF EVAPORATOR FANS 

The fan control mode is selected by means of the “

FnC

” parameter: 

FnC = C_n:

  fans will switch ON and OFF with the compressor and

 not run

 during defrost; 

FnC = o_n

  fans will run even if the compressor

After defrost, there is a timed fan delay allowing f

FnC = C_Y

   fans will switch ON and OFF with th

FnC = o_Y

  fans will run continuously also durin

An additional parameter “

FSt

” provides the settin

above which the fans are always OFF. This i
temperature is lower than set in “FSt”. 

3.3.1  Forced activation of fans 

This function managed by the 

Fct

 parameter is

happen when the controller is switched on o
evaporator. 

Functioning: 

if the difference of te

probes is more than the value of the Fct paramet
is disabled. 

3.3.2  Cyclical activation of the fans w

When Fnc = c-n or c-Y (fans in parallel to t
parameters the fans can carry out on and off cyc
compressor is stopped the fans go on working fo
off, when the compressor is off.  

4.

FRONT PANEL COMMANDS 

: To display target set point; in program

operation. 

 (DEF) 

To start a manual defrost 

  (

UP)

: To see the max. stored temperatur

codes or increases the displayed value. 

 (

DOWN

) To see the min stored temperatu

codes or decreases the displayed value. 

To switch the instrument off, if onF 

 Not 

enabled. 

KEY COMBINATIONS: 

+ 

To lock & unlock the 

+

To enter in programm

+

To return to the room

4.1

USE OF LEDS 

Each LED function is described in the following ta

LED 

MODE 

ON Compressor 

enabled 

Flashing 

Anti-short cycle delay en

ON Defrost 

enabled 

Flashing 

Drip time in progress 

ON Fans 

enabled 

Flashing 

Fans delay after defrost 

ON 

An alarm is occurring 

ON 

Continuous cycle is runn

  ON 

Energy saving enabled 

°C/°F 

ON Measurement 

unit 

°C/°F 

Flashing Programming 

phase 

5.

MAX & MIN TEMPERATURE ME

5.1

HOW TO SEE THE MIN TEMPERA

1. 

Press and release the 

n

 key. 

2. 

The “Lo” message will be displayed followed

3. 

By pressing the 

n

 key again or by waiting 

5.2

HOW TO SEE THE MAX TEMPER

1. 

Press and release the 

o

 key. 

2. 

The “Hi” message will be displayed followed

3. 

By pressing the 

o

 key again or by waiting 

5.3

HOW TO RESET THE MAX AND M

1.

Hold press the SET key for more than 3s, w
message will be displayed) 

2.

To confirm the operation the “rSt” message
displayed. 

Thermo Scientific

dIXEL Installing and Operating Instructions

         24