dixell XR160C, XR160D, XR170C, XR170D, XR162C XR172C Installing And Operating Insructions

Dixell

Installing and Operating Instructions

release 7.0

XR160C - XR160D - XR170C - XR170D - XR162C - XR172C

CONTENTS

1. GENERAL WARNING__________________________________________________ 2

1.1 Please read before using this manual _____________________________________ 2

1.2 Safety Precautions____________________________________________________ 2

2. GENERAL DESCRIPTION ______________________________________________ 2

3. CONTROLLING LOADS________________________________________________ 2

3.1 The compressor______________________________________________________ 2

3.2 Fast freezing ________________________________________________________ 3

3.3 Defrost _____________________________________________________________ 3

3.4 “Air dryer” applications_________________________________________________ 3

3.5 Control of evaporator fans ______________________________________________ 3

3.6 Fan relay used as 2° compressor ________________________________________ 3

4. FRONT PANEL COMMANDS____________________________________________ 3

4.1 Use of LEDS ________________________________________________________ 4

5. FUNCTION AND PARAMETERS’ PROGRAMMING MENU ____________________ 4

5.1 Function Menu_______________________________________________________ 4

5.2 List of functions ______________________________________________________ 4

5.3 Exit Timeout_________________________________________________________ 5

5.4 Accessing “Pr2” and SECURITY CODE input _______________________________ 5

5.5 Changing a parameter’s value___________________________________________ 5

6. LIST OF PARAMETERS________________________________________________ 5

7. INSTALLATION AND MOUNTING ________________________________________ 7

8. ELECTRICAL CONNECTIONS __________________________________________ 7

8.1 Probes connection____________________________________________________ 7

9. ALARM SIGNALS_____________________________________________________ 7

9.1 Silencing buzzer / alarm relay output______________________________________ 7

9.2 Alarm “EE” __________________________________________________________ 7

9.3 Alarm reset through keyboard ___________________________________________ 8

9.4 Alarm recovery_______________________________________________________ 8

10. TECHNICAL DATA ___________________________________________________ 8

11. CONNECTIONS _____________________________________________________ 9

12. DEFAULT SETTING VALUES

952057-58 XR160C - XR170C - XR160D - XR170D - XR162C - XR172C 1/י

- STANDARD MODELS _____________________ 10

Dixell

Installing and Operating Instructions

release 7.0

1. GENERAL WARNING

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

• 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.

• The instrument must not be opened.

• Fit the probe where it is not accessible by the End User.

• In case of failure or faulty operation send the instrument back to the distributor or to dIXEL 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.

Safety Precautions

2. GENERAL DESCRIPTION

Models XR160C and XR170C, 32x74 mm format, are microprocessor based controllers suitable for
applications on medium or low temperature refrigerating units. They are provided with three relay outputs to
control compressor, defrost - which can be either electrical or hot gas - and the evaporator fans. They are also
provided with two PTC probe inputs, one for temperature control, the other to be located onto the evaporator
to control the defrost termination temperature.
Model XR170C also features an additional relay for the alarm output and an internal buzzer for acoustic signal.
Models XR160D and XR170D, DIN RAIL format, provide the same features as the correspondent XR160C
and XR170C models. Alarm conditions in model XR160D are also signalled by a 12V/40mA output.
Models XR162C and XR172C, matched with slave devices XR30SL and XR40SL respectively, provide the
same features as XR160C and XR170C.
Each instrument is fully configurable through special parameters that can be easily programmed through the
keypad.

3. CONTROLLING LOADS

3.1 The 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.
In case of fault in the thermostat probe the start
and stop of the compressor are timed through
parameters “COn” and “COF”.

952057-58 XR160C - XR170C - XR160D - XR170D - XR162C - XR172C 2/י

Dixell

Installing and Operating Instructions

release 7.0

3.2 Fast freezing

When defrost is not in progress, it can be activated the keypad by holding the “UP” key pressed for about 3
seconds. The compressor operates in continuous mode for the time set through the “CCt” parameter. The
cycle can be terminated before the end of the set time using the same activation key, “UP” for about 3
seconds.

3.3 Defrost

Two defrost modes are available through the “tdF” parameter: defrost through electrical heater (tdF = 0) and
hot gas defrost (tdF = 1). Other parameters are used to control the interval between defrost cycles and its
maximum length.The defrost end is controlled by the evaporator’s probe.
At the end of defrost the drip time starts - it is controlled through the “Fdt” parameter.

3.4 “Air dryer” applications

The tdF parameter can be set also for “Air dryer” applications. In this case (tdF=2 or 3) the defrost relay is
energised according to the “Short Time” mode. The following parameter table describes the cycle times when
the tdF parameter is selected for Long or Short time.

Parameters Long time (tdF = 0; 1) Short time (tdF = 2; 3)

dAF, dSd, MdF, Fdt minutes seconds
IdF hours minutes

3.5 Control of evaporator fans

The fan control mode is selected by means of the “FnC” parameter:

FnC=0 fans will switch ON and OFF with the compressor and not run during defrost:;
FnC=1 fans will run continuously, but not during defrost

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

FnC=2 fans will switch ON and OFF with the compressor and run during defrost;
FnC=3 fans will run continuously also during defrost

An additional parameter “FSt” provides the setting of temperature, detected by the evaporator probe, above
which the fans are always OFF. This can be used to make sure circulation of air only if his temperature is
lower than set in “FSt”.

3.6 Fan relay used as 2° compressor

If FnC=4 the fan relay is programmed to control a second compressor, in this case the Fnd parameter value is
defined as time delay, in seconds, between turning on compressors 1 and 2.

4. FRONT PANEL COMMANDS

SET: TO DISPLAY TARGET SET POINT: by pressing and releasing this key the set point is displayed

for 5s.

TO MODIFY SET POINT: by holding the key pressed for at least 2s set point change mode is entered: the set

point is displayed and the LEDs of the first and third digits blink. To change the value use the “UP”
and “DOWN” keys. The new value can be stored either by pressing the “SET” key (the instrument

TO START A FAST FREEZING CYCLE: in normal operation, by holding it pressed for 3s the fast

restores temperature display) or by waiting the exit time-out to expire (15s).

(UP): in programming mode or in “Function Menu” it browses the parameter codes or increases the

value of the displayed variable. Hold pressed for a faster change.

freezing cycle is started. Such cycle can be interrupted by holding the “UP” key pressed for 3s.

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