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Installing and Operating Instructions

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

ModBUS compatible monitoring system.

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

probe, ntc = NTC probe.

onF Enrgy saving key enabling: nu = disabled; oFF = not set it; ES = enabled.

dP1 Thermostat probe display

dP3 Third probe display- optional.

dP4 Fourth probe display.

rSE Real set point: (readable only), it shows the set point used during the energy saving

cycle or during the continuous cycle.

rEL Software release for internal use.

Ptb Parameter table code: readable only.

8. DIGITAL INPUT

(ENABLED WITH P3P = N)

The free voltage digital input is programmable in 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); CPr, F_C = Compressor OFF.

Since the door is opened, after the delay time set through parameter "did", the door alarm is

enabled, the display shows the message "dA" and the regulation restarts is rtr = yES. The

alarm stops as soon as the external digital input is disabled again. With the door open, the

high and low temperature alarms are disabled.

8.2 GENERIC ALARM (i1F = EAL)

As soon as the digital input is activated the unit will wait for "did" time delay before signalling

the "EAL" alarm message. The outputs status don't change. The alarm stops just after the

digital input is de-activated.

8.3 SERIOUS ALARM MODE (i1F = bAL)

When the digital input is activated, the unit will wait for "did" delay before signalling the "CA"

alarm message. The relay outputs are switched OFF. The alarm will stop as soon as the

digital input is de-activated.

8.4 PRESSURE SWITCH (i1F = PAL)

If during the interval time set by "did" parameter, the pressure switch has reached the number

of activation of the "nPS" parameter, the "CA" pressure alarm message will be displayed. The

compressor and the regulation are stopped. When the digital input is ON the compressor is

always OFF.

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

restart normal regulation.

8.5 START DEFROST (i1F = dFr)

It starts a defrost if there are the right conditions. After the defrost is finished, the normal

regulation will restart only if the digital input is disabled otherwise the instrument will wait until

the "MdF" safety time is expired.

8.6 INVERSION OF THE KIND OF ACTION: HEATING-COOLING (i1F = Htr)

This function allows to invert the regulation of the controller: from cooling to heating and

viceversa.

8.7 ENERGY SAVING (i1F = ES)

The Energy Saving function allows to change the set point value as the result of the SET+

HES (parameter) sum. This function is enabled until the digital input is activated.

8.8 DIGITAL INPUTS POLARITY

The digital input polarity depends on the "i1P" parameter.

i1P=CL: the input is activated by closing the contact.

i1P=OP: the input is activated by opening the contact

9. TTL SERIAL LINE – FOR MONITORING SYSTEMS

The TTL serial line, available through the HOT KEY connector, allows by means of the

external TTL/RS485 converter, XJ485-CX, to connect the instrument to a monitoring system

ModBUS-RTU compatible such as the X-WEB500/3000/300.

10. X-REP OUTPUT – OPTIONAL

As optional, an X-REP can be connected to the instrument, trough the HOY

KEY connector. The X-REP output EXCLUDES the serial connection.

11. INSTALLATION AND MOUNTING

Instrument XR20CX shall be mounted on vertical panel, in a

29x71 mm hole, and fixed using the special bracket supplied.

The temperature range allowed for correct operation is 0÷60

°C. Avoid places subject to strong vibrations, corrosive

gases,

excessive

recommendations apply to probes. Let air circulate by the

cooling holes.

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

To connect the X-REP to the

instrument the following

connectors must be used CAB-

51F(1m), CAB-52F(2m), CAB-

55F(5m),

dirt

humidity.

The

same

XR20CX

12. ELECTRICAL CONNECTIONS

The instrument is provided with screw terminal block to connect cables with a cross section up

to 2,5 mm

. Before connecting cables make sure the power supply complies with the

instrument's requirements. Separate the probe cables from the power supply cables, from the

outputs and the power connections. Do not exceed the maximum current allowed on each

relay, in case of heavier loads use a suitable external relay.

12.1 PROBE CONNECTION

The probes shall be mounted with the bulb upwards to prevent damages due to casual liquid

infiltration. It is recommended to place the thermostat probe away from air streams to correctly

measure the average room temperature. Place the defrost termination probe among the

evaporator fins in the coldest place, where most ice is formed, far from heaters or from the

warmest place during defrost, to prevent premature defrost termination.

13. HOW TO USE THE HOT KEY

13.1 HOW TO PROGRAM A HOT KEY FROM THE INSTRUMENT (UPLOAD)

Program one controller with the front keypad.

When the controller is ON, insert the "Hot key" and push 9 key; the "uPL" message

appears followed a by flashing "End"

Push "SET" key and the End will stop flashing.

Turn OFF the instrument remove the "Hot Key", then turn it ON again.

NOTE: the "Err" message is displayed for failed programming. In this case push again 9 key

if you want to restart the upload again or remove the "Hot key" to abort the operation.

13.2 HOW TO PROGRAM AN INSTRUMENT USING A HOT KEY

(DOWNLOAD)

Turn OFF the instrument.

Insert a programmed "Hot Key" into the 5 PIN receptacle and then turn the

Controller ON.

Automatically the parameter list of the "Hot Key" is downloaded into the Controller

memory, the "doL" message is blinking followed a by flashing "End".

After 10 seconds the instrument will restart working with the new parameters.

Remove the "Hot Key"..

NOTE the message "Err" is displayed for failed programming. In this case turn the unit off and

then on if you want to restart the download again or remove the "Hot key" to abort the

operation.

14. ALARM SIGNALS

Message

Cause

"P1"

Room probe failure

"P3"

Third probe failure

"P4"

Fourth probe failure

"HA"

Maximum temperature alarm

"LA"

Minimum temperature alarm

"HA2"

Condenser high temperature

"LA2"

Condenser low temperature

"dA"

Door open

"EA"

External alarm

"CA"

Serious

external

alarm

(i1F=bAL)

"CA"

Pressure

switch

alarm

(i1F=PAL)

14.1 ALARM RECOVERY

Probe alarms P1", "P3" and "P4" start some seconds after the fault in the related probe; they

automatically stop some seconds after the probe restarts normal operation. Check

connections before replacing the probe.

Temperature alarms "HA", "LA" "HA2" and "LA2" automatically stop as soon as the

temperature returns to normal values.

Alarms "EA" and "CA" (with i1F=bAL) recover as soon as the digital input is disabled.

Alarm "CA" (with i1F=PAL) recovers only by switching off and on the instrument.

14.2 OTHER MESSAGES

Pon

Keyboard unlocked.

PoF

Keyboard locked

noP

In programming mode: none parameter is present in Pr1

On the display or in dP2, dP3, dP4: the selected probe is nor enabled

noA

None alarm is recorded.

15. TECHNICAL DATA

Housing: self extinguishing ABS.

Case: XR20CX frontal 32x74 mm; depth 60mm;

Mounting: XR20CX panel mounting in a 71x29mm panel cut-out

Protection: IP20; Frontal protection: XR20CX IP65

Connections: Screw terminal block ≤ 2,5 mm

Power supply: according to the model: 12Vac/dc, ±10%; 24Vac/dc, ±10%; 230Vac ±10%,

50/60Hz, 110Vac ±10%, 50/60Hz

Power absorption: 3VA max

1592020022

Outputs

Compressor output acc. to par. "Con" and

"COF"

Outputs unchanged

Outputs unchanged.

It depends on the "Ac2" parameter

It depends on the "bLL" parameter

Compressor according to rrd

Output unchanged.

All outputs OFF.

All outputs OFF

wiring.

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