Cold Stream XR20C Installation Manual

dIXEL

Installing and Operating Instructions

Digital controller with off cycle defrost

XR20C – XR20D

1592007211

CONTENTS

1. GENERAL WARNING __________________________________________ 1

2. GENERAL DESCRIPTION_______________________________________ 1

3. CONTROLLING LOADS ________________________________________ 1

4. FRONT PANEL COMMANDS ____________________________________ 1

5. TEMPERATURE ALARM AND ITS DURATION RECORDING (HACCP) ___1

6. MAIN FUNCTIONS_____________________________________________ 2

7. PARAMETERS________________________________________________ 2

8. DIGITAL INPUT (IF AVAILABLE)__________________________________ 2

9. INSTALLATION AND MOUNTING_________________________________3

10. ELECTRICAL CONNECTIONS ___________________________________3

11. HOW TO USE THE HOT KEY ____________________________________3

12. ALARM SIGNALS______________________________________________ 3

13. TECHNICAL DATA_____________________________________________ 3

14. CONNECTIONS _______________________________________________ 3

15. DEFAULT SETTING VALUES ____________________________________ 4

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

• Warning: disconnect all electrical connections before any kind of

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

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

• Consider the maximum current which can be applied to each relay (see

• Ensure that the wires for probes, loads and the power supply are separated

• In case of applications in industrial environments, the use of mains filters (our

SAFETY PRECAUTIONS

operating limits avoiding sudden temperature changes with high atmospheric humidity to prevent formation of condensation

maintenance.

not be opened.

or to “Dixell S.p.A.” (see address) with a detailed description of the fault.

Technical Data).

and far enough from each other, without crossing or intertwining.

mod. FT1) in parallel with inductive loads could be useful.

2. GENERAL DESCRIPTION

Models XR20C, format 32 x 74 mm, and XR20D, DIN rail format, are thermostats with off cycle defrost designed for refrigeration applications at normal temperature. They have a relay output to drive the compressor and a PTC or NTC probe input. A internal timer manages the off cycle defrost. 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.

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

Defrost is performed through a simple stop of the compressor. Parameter “IdF” controls the interval between defrost cycles, while its length is controlled by parameter “MdF”.

4. FRONT PANEL COMMANDS

XR20C

XR20D

SET: To display target set point; in programming mode it selects a parameter or

confirm an operation.

(DEF) To start a manual defrost

o (UP): To see the last temperature alarm happened; in programming mode it

browses the parameter codes or increases the displayed value.

n (DOWN) To see the last temperature alarm happened; in programming mode it

browses the parameter codes or decreases the displayed value.

KEY COMBINATIONS:

o + n To lock & unlock the keyboard. SET + n To enter in programming mode.

SET + o To return to the room temperature display.

4.1 USE OF LEDS

Each LED function is described in the following table.

LED MODE FUNCTION

ON Compressor enabled

Flashin

-Programming Phase (flashing with

- Anti-short cycle delay enabled

ON Defrost enabled

Flashin

- Programming Phase (flashing with

g ON An temperature alarm happened

)

5. TEMPERATURE ALARM AND ITS DURATION RECORDING (HACCP)

XR20C signals and records temperature alarms, together with their duration and max value reached. See drawing:

Ex. High temperature alarm

Temperature

Max

Temperature

High temp. alarm

Set

ALL

Low temp. alarm

Safe food zone

larm duration

Time

5.1 HOW TO SEE THE ALARM DURATION AND MAX (MIN) TEMPERATURE

If the alarm LED is on, an alarm has taken place. To see the kind of alarm, the max (min) reached temperature and alarm duration do as follows:

1. Push the Up or Down key.

2. On the display the following message is shown:: “HAL” for high temperature alarm (“LAL” fot the minimum allarm), followed by the Maximum (minimum) temperature. Then the “tiM” (tiMe) message is displayed, followed by the “Duration” in h.mm.

3. Then the instrument displays the temperature once again.

NOTE1: if an alarm is still occurring the “tim” shows the partial duration. NOTE2: the alarm is recorded when the temperature come back to normal values

5.2 HOW TO RESET A RECORDED ALARM OR ONE THAT IS

STILL OCCURRING

1. Hold the SET key pressed for more than 3s, while the recorded alarm is

displayed. (the rSt message will be displayed)

2. To confirm the operation, the “rSt” message starts blinking and the normal

temperature will be displayed.

1592007211 XR20C-D GB r1.0 22.04.2005.doc XR20C – XR20D 1/4

dIXEL

Installing and Operating Instructions

6. MAIN FUNCTIONS

6.1 HOW TO SEE THE SETPOINT

1. Push and immediately release the SET key: the display will show the Set point value;

2. Push and immediately release the SET key or wait for 5 seconds to display the probe value again.

6.2 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

3. To change the Set value push the o or n arrows within 10s.

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

LED starts blinking;

6.3 HOW TO START A MANUAL DEFROST

Push the DEF key for more than 2 seconds and a manual defrost will start.

6.4 HOW TO CHANGE A PARAMETER VALUE

To change the parameter’s value operate as follows:

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

To exit: Press SET + UP 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.

1. Enter the Programming mode by pressing the Set and DOWN key for 3s (

2. Select the required parameter.

3. Press the “SET” key to display its value (now only the LED is blinking).

4. Use “UP” or “DOWN” to change its value.

and

start blinking).

6.5 THE HIDDEN MENU

The hidden menu Includes all the parameters of the instrument.

6.5.1 HOW TO ENTER THE HIDDEN MENU

3. Select the required parameter.

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

5. Use o or n to change its value.

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

To exit: Press SET + o 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.

6.5.2 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 + n”. In HIDDEN MENU when a parameter is present in First Level the decimal point is on.

1. Enter the Programming mode by pressing the Set + n

key for 3s (LED 1 and

2. When a parameter is displayed keep pressed the Set+n

for more than 7s. The Pr2 label will be displayed immediately followed from the HY parameter.

NOW YOU ARE IN THE HIDDEN MENU.

start blinking).

LED is blinking).

6.6 HOW TO LOCK THE KEYBOARD

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

2. The “POF” message will be displayed and the keyboard will be locked. At this

point it will be possible only to see the set point or the MAX o Min temperature stored

3. If a key is pressed more than 3s the “POF” message will be displayed.

6.7 TO UNLOCK THE KEYBOARD

Keep pressed together for more than 3s the o and n keys, till the “Pon” message will be displayed.

6.8 THE CONTINUOUS CYCLE

When defrost is not in progress, it can be activated by holding the “o” 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 “o” for 3 seconds.

7. PARAMETERS

NOTE: the parameters preceded by dots are in the Hidden Menu. REGULATION Hy Differential: (0,1 ÷ 25,5°C / 1÷255 °F) Intervention differential for set point.

Compressor Cut IN is Set Point Plus Differential (Hy). Compressor Cut OUT is when the temperature reaches the set point.

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• LS Minimum set point: (- 50°C÷SET/-58°F÷SET): Sets the minimum

acceptable value for the set point.

• US Maximum set point: (SET÷110°C/ SET÷230°F). Set the maximum

acceptable value for set point.

Ot Thermostat probe calibration: (-12.0÷12.0°C;

-120÷120°F) allows to adjust possible offset of the thermostat probe.

• OdS Outputs activation delay at start up: (0÷255min) This function is

enabled at the initial start up of the instrument and inhibits any output activation for the period of time set in the parameter.

AC Anti-short cycle delay: (0÷50 min) minimum interval between the

compressor stop and the following restart.

• CCt Compressor ON time during continuous cycle: (0.0÷24.0h; res.

10min) Allows to set the length of the continuous cycle: compressor stays on without interruption for the CCt time. Can be used, for instance, when the room is filled with new products.

• COn Compressor ON time with faulty probe: (0÷255 min) time during which

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

• COF Compressor OFF time with faulty probe: (0÷255 min) time during

which the compressor is OFF in case of faulty thermostat probe. With COF=0

compressor is always active.

CH Type of action: CL = cooling; Ht = heating. DISPLAY

• CF Temperature measurement unit:

°C=Celsius; °F=Fahrenheit. WARNING: When the measurement unit is changed the SET point and the values of the parameters Hy, LS, US, Ot, ALU and ALL have to be checked and modified if necessary).

rES Resolution (for °C): (in = 1°C; dE = 0.1 °C) allows decimal point display. DEFROST IdF Interval between defrost cycles: (0÷120h) Determines the time interval

between the beginning of two defrost cycles.

MdF (Maximum) length for defrost: (0÷255min) When P2P = n, (not evaporator

probe: timed defrost) it sets the defrost duration, when P2P = y (defrost end based on temperature) it sets the maximum length for defrost.

• dFd Temperature displayed during defrost: (rt = real temperature; it =

temperature at defrost start; SEt = set point; dEF = “dEF” label)

• dAd MAX display delay after defrost: (0÷255min). Sets the maximum time

between the end of defrost and the restarting of the real room temperature display.

ALARMS

• ALC Temperature alarms configuration: (Ab; rE)

Ab= absolute temperature: alarm temperature is given by the ALL or ALU

values. rE = temperature alarms are referred to the set point. Temperature alarm is enabled when the temperature exceeds the “SET+ALU” or “SET-ALL” values.

ALU MAXIMUM temperature alarm: (SET÷110°C; SET÷230°F) when this

temperature is reached the alarm is enabled, after the “ALd” delay time.

ALL Minimum temperature alarm: (-50.0 ÷ SET°C;

-58÷230°F when this temperature is reached the alarm is enabled, after the “ALd” delay time.

• ALd Temperature alarm delay: (0÷255 min) time interval between the

detection of an alarm condition and alarm signalling.

• dAO Exclusion of temperature alarm at startup: (from 0.0 min to 23.5h)

time interval between the detection of the temperature alarm condition after instrument power on and alarm signalling.

DIGITAL INPUT (IF AVAILABLE) i1P Digital input polarity: oP: the digital input is activated by opening the

contact; CL: the digital input is activated by closing the contact.

i1F Digital input configuration:

EAL = external alarm: “EA” message is displayed; bAL = serious alarm “CA”

message is displayed. PAL = pressure switch alarm, “CA” message is displayed; dor = door switch function; dEF = activation of a defrost cycle; LHt =not enabled; Htr = kind of action inversion (cooling – heating).

did: (0÷255 min)

with i1F= EAL or i1F = bAL digital input alarm delay: delay between the

detection of the external alarm condition and its signalling.

with i1F= dor: door open signalling delay with i1F = PAL: time for pressure switch function: time interval to

calculate the number of the pressure switch activation.

nPS Pressure switch number: (0

switch, during the “did” interval, before signalling the alarm event (I2F= PAL).

If the nPS activation in the did time is reached, switch off and on the instrument to restart normal regulation.

• odc Compressor status when open door: no, Fan = normal; CPr, F_C =

Compressor OFF

OTHER PbC Type of probe: it allows to set the kind of probe used by the instrument: PbC

= PBC probe, ntC = NTC probe.

• rEL Software release for internal use.

• Ptb Parameter table code: readable only.

8. DIGITAL INPUT (IF AVAILABLE)

The free contact digital input is programmable in five different configurations by the “i1F” parameter.

8.1 DOOR SWITCH INPUT (i1F = dor)

It signals the door status and the corresponding relay output status through the “odc” parameter:

no, Fan = normal (any change);

÷15) Number of activation of the pressure

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