Alto Shaam XR20CX Installation Manual

dIXEL

Installing and Operating Instructions

1592020020

4. FRONT PANEL COMMANDS

Digital controller with off cycle defrost

XR20CX

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 _____________________________________________________ 1

7. PARAMETERS ________________________________________________________ 2

8. DIGITAL INPUT ________________________________________________________ 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 _____________________________________________________ 3

16. CONNECTIONS _______________________________________________________4

17. 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 operating limits

• 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

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

• 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

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

SAFETY PRECAUTIONS

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

opened.

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

enough from each other, without crossing or intertwining.

in parallel with inductive loads could be useful.

2. GENERAL DESCRIPTION

Model XR20C, format 32 x 74 mm, is a digital thermostat with off cycle defrost designed for refrigeration applications at normal temperature. It provides a relay output to drive the compressor. It is also provided with 2 NTC or PTC probe inputs, the first one for temperature control, the second one, optional, to connect to the HOT KEY terminals to signal the condenser temperature alarm or to display a temperature. As an option, the digital input can operate as third 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. 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”.

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

an operation.

(DEF) To start a manual defrost

(UP): To see the max. stored temperature; in programming mode it browses the

parameter codes or increases the displayed value.

(DOWN) To see the min stored temperature; in programming mode it browses the

parameter codes or decreases the displayed value.

To switch the instrument off, if onF = oFF.

Not enabled

KEY COMBINATIONS:

+ To enter in programming mode. + To return to the room temperature display.

To lock & unlock the keyboard.

4.1 USE OF LEDS

Each LED function is described in the following table.

LED MODE FUNCTION

ON Compressor enabled

Flashing Anti-short cycle delay enabled

ON Defrost enabled

ON An alarm is occurring

ON Continuous cycle is running ON Energy saving enabled

°C/°F

ON Measurement unit

°C/°F

Flashing Programming phase

5. MAX & MIN TEMPERATURE MEMORIZATION

5.1 HOW TO SEE THE MIN TEMPERATURE

1. Press and release the n key.

2. The “Lo” message will be displayed followed by the minimum temperature recorded.

3. By pressing the n key again or by waiting 5s the normal display will be restored.

5.2 HOW TO SEE THE MAX TEMPERATURE

1. Press and release the o key.

2. The “Hi” message will be displayed followed by the maximum temperature recorded.

3. By pressing the o key again or by waiting 5s the normal display will be restored.

5.3 HOW TO RESET THE MAX AND MIN TEMPERATURE RECORDED

1. Hold press the SET key for more than 3s, while the max. or min temperature is displayed. (rSt message will be displayed)

2. To confirm the operation the “rSt” message starts blinking and the normal temperature will be displayed.

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;

display the probe value again.

2. Push and immediately release the SET key or wait for 5 seconds to

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 “°C” or “°F” LED starts blinking;

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.

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:

1592020020 XR20CX GB m&M r1.0 30.11.2006.doc XR20CX 1/4

dIXEL

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

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 15s without pressing a key. NOTE: the set value is stored even when the procedure is exited by waiting the time-out to

expire.

starts blinking).

Installing and Operating Instructions

6.5 THE HIDDEN MENU

The hidden menu Includes all the parameters of the instrument.

6.5.1 HOW TO ENTER THE HIDDEN MENU

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

starts blinking).

2. Released the keys, then push again the Set+n keys for more than 7s. The Pr2 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 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. NOTE1: if none parameter is present in Pr1, after 3s the “noP” message is displayed. Keep

the keys pushed till the Pr2 message is displayed. NOTE2: 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.

6.6 HOW TO LOCK THE KEYBOARD

1. Keep pressed for more than 3 s the UP + DOWN 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 to maintain the “ccS” set point 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.

6.9 THE ON/OFF FUNCTION

WARNING: Loads connected to the normally closed contacts of the relays are always supplied and under voltage, even if the instrument is in stand by mode.

With “onF = oFF”, pushing the ON/OFF key, the instrument is switched off. The “OFF” message is displayed. In this configuration, the regulation is disabled. To switch the instrument on, push again the ON/OFF key.

7. PARAMETERS

REGULATION Hy Differential: (0,1 ÷ 25,5°C / 1÷255 °F) Intervention differential for set point. Compressor

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

LS Minimum set point: (- 50°C÷SET/-58°F÷SET): Sets the minimum value for the set point. US Maximum set point: (SET÷110°C/ SET÷230°F). Set the maximum 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.

P3P Third probe presence (P3) – Only if this option is present: n= not present:, the

terminal number 9 operates as digital input.; y= present:, the terminal number 9 operates as third probe.

O3 Third probe calibration (P3) – Only if this option is present: (-12.0÷12.0°C; -

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

P4P Fourth probe presence: (n = Not present; y = present). o4 Fourth probe calibration: (-12.0÷12.0°C) allows to adjust possible offset of the fourth

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.

CCS Set point for continuous cycle: (-50÷150°C) it sets the set point used during the

continuous cycle.

1592020020

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. dLy Display delay: (0 ÷20.0m; risul. 10s) when the temperature increases, the display is

updated of 1 °C/1°F after this time.

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.

AFH Differential for temperature alarm recovery: (0,1÷25,5°C; 1÷45°F) Intervention

differential for recovery of temperature alarm.

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.

CONDENSER TEMPERATURE ALARM (detected by the fourth probe) AL2 Low temperature alarm of condenser: (-55÷150°C) when this temperature is reached

the LA2 alarm is signalled, possibly after the Ad2 delay.

Au2 High temperature alarm of condenser: (-55÷150°C) when this temperature is reached

the HA2 alarm is signalled, possibly after the Ad2 delay.

AH2 Differential for temperature condenser alarm recovery: (0,1÷25,5°C; 1÷45°F) Ad2 Condenser temperature alarm delay: (0÷255 min) time interval between the detection

of the condenser alarm condition and alarm signalling.

dA2 Condenser temperature alarm exclusion at start up: (from 0.0 min to 23.5h, res.

10min)

bLL Compressor off with low temperature alarm of condenser: n = no: compressor

keeps on working; Y = yes, compressor is switched off till the alarm is present, in any case regulation restarts after AC time at minimum.

AC2 Compressor off with high temperature alarm of condenser: n = no: compressor

keeps on working; Y = yes, compressor is switched off till the alarm is present, in any case regulation restarts after AC time at minimum.

DIGITAL INPUT 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; AUS = not enabled; Htr = kind of action inversion (cooling – heating); FAn = do not set it; ES = Energy saving.

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

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.

rrd Outputs restart after doA alarm: no = outputs not affected by the doA alarm; yES =

outputs restart with the doA alarm;

HES Temperature increase during the Energy Saving cycle : (-30,0°C÷30,0°C/-22÷86°F)

it sets the increasing value of the set point during the Energy Saving cycle.

OTHER Adr Serial address (1÷244): Identifies the instrument address when connected to a

ModBUS compatible monitoring system.

÷15) Number of activation of the pressure switch, during

1592020020 XR20CX GB m&M r1.0 30.11.2006.doc XR20CX 2/4

+ 2 hidden pages