Installation And Mounting; Electrical Connections; Alarm Signals - Emerson Dixell XR20CH Installing And Operating Instructions

OTHER
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 on/off key enabling: nu = disabled; oFF = enabled; ES = not set it.
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.
1592038010 XR20CH GB r1.0 05.05.2014
To connect the X-REP to the
instrument the following
connectors must be used CAB-
51F(1m), CAB-52F(2m), CAB-
55F(5m),

11. INSTALLATION AND MOUNTING

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
2
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)
1. Program one controller with the front keypad.
When the controller is ON, insert the "Hot key" and push o key; the "uPL" message
2.
appears followed a by flashing "End"
3. Push "SET" key and the End will stop flashing.
4. 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 o 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)
1. Turn OFF the instrument.
2. Insert a programmed "Hot Key" into the 5 PIN receptacle and then turn the
Controller ON.
3. Automatically the parameter list of the "Hot Key" is downloaded into the Controller
memory, the "doL" message is blinking followed a by flashing "End".
4. After 10 seconds the instrument will restart working with the new parameters.
5. 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
(i1F=bAL)
"CA" Pressure
(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.
XR20CH
Instrument XR20CH 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 dirt or
recommendations apply to probes. Let air circulate by the
cooling holes.
Outputs
Compressor output acc. to par. "Con" and
"COF"
Outputs unchanged
Outputs unchanged
Outputs unchanged.
Outputs unchanged.
It depends on the "Ac2" parameter
It depends on the "bLL" parameter
Compressor according to rrd
Output unchanged.
external alarm All outputs OFF.
switch alarm All outputs OFF
humidity. The same
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