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Installing and Operating Instructions

6.4 HOW TO CHANGE A PARAMETER VALUE

To change the parameter's value operate as follows:

1. Enter the Programming mode by pressing the Set + 8 keys for 3s (the "°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 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 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 + 8 keys for 3s (the "°C" or "°F" LED

starts blinking).

2. Released the keys, then push again the Set+8 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 9 or 8 to change its value.

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

To exit: Press SET + 9 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 + 8 ".

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

6.6 HOW TO LOCK THE KEYBOARD

Keep pressed for more than 3 s the UP + DOWN keys.

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

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 9 and 8 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 "9 " 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 "9 " for 3 seconds.

6.9 THE ENERGY SAVING FUNCTION

With "onF = ES", pushing the

function allows to change the set point value as the result of the SET+ HES

To stop the energy saving push again the

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): n= not present:, the terminal operates as digital input.; y=

present:, the terminal operates as third probe.

O3 Third probe calibration (P3): (-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.

1592020022 XR20CX GB ES m&M r1.1 05.03.2007.doc

key, energy saving cycle is enabled: this

key.

XR20CX

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)

AP2 Probe selection for temperature alarm of condenser: nP = no probe; P1 =thermostat

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

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

15) Number of activation of the pressure 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.

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

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

OTHER

1592020022

30,0°C/-22÷86°F)

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