Page 1
Installing and Operating Instructions
Digital controller with off cycle defrost
XR20CX
CONTENTS
GENERAL WARNING___________________________________________________1
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)
2. GENERAL DESCRIPTION
Model XR20C, format 32 x 74 mm, is a digita l 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. The digital input can operate as
third temperature probe.
The HOT KEY output allows to connect the unit, by means of the externa l module XJ485-CX,
to a network line ModBUS-RTU compatible such as the 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 st arted
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”.
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.
Temper.
SET
Time
Compr.
ON
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4. FRONT PANEL COMMANDS
: 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 activate / deactivate the energy saving cycle.
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 8 key.
2. The “Lo” message will be displayed followed by the minimum temperature recorded.
3. By pressing the 8 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 9 key.
2. The “Hi” message will be displayed followed by the maximum temperature recorded.
3. By pressing the 9 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 displ ayed)
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.
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 9or 8 arrows within 10s.
4. To memorise the new set point value push th e SET key again or wait 10s.
2. Push and immediately release the SET key or wait for 5 seconds to
6.3 HOW TO START A MANUAL DEFROST
Push the DEF key for more than 2 seconds and a manual defrost will
start.
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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 mo de 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 mo de 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 wil l
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 9or 8 to change its value.
6. Press “SET” to store the new value and move to the following parameter.
To exit: Press SET + 9or 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
1. Keep pressed for more than 3 s th e 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 9and 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 ab out
3 seconds. The compressor operates to maintain the “ccS” set point for the time set through
the “CCt” parameter. The cycle can be te rminated 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 key, energy saving cycle is enabled: this
function allows to change the set point value as the result of the SET+ HES
To stop the energy saving push again the
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): 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 wit hout 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.
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COn Compressor ON time with faulty probe: (0÷255 min) time during which the
compressor is active in case of faulty t hermost at probe. With CO n= 0 compressor i s alw ays
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 cycl es: (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 poi nt . Tempera tur e alarm is enab led 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 wh en 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 betwee n th e det ecti on of an al arm
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 al arm 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 temper ature alarm delay: (0÷255 min) time interval between the detection
of the condenser alarm condition and alarm signalling.
dA2 Condenser temperature alarm excl usion 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 digi tal 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 o n the i nstrument 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 do A 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
÷15) Number of activation of the pressure switch, during
÷30,0°C/-22÷86°F)
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Adr Serial address (1÷244): Identifies the instrument address when connected to a
PbC Type of probe: it allows to set the kind of probe used by the instrument: PbC = PBC
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
rEL Software release for internal use.
Ptb Parameter table code: readable only.
ModBUS compatible monitoring system.
probe, ntc = NTC probe.
cycle or during the continuous cycle.
Installing and Operating Instructions
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 th e “ nPS” parameter, the “ CA” pressu re al arm message wi ll be disp laye d. Th e
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 cont act
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.
To connect the X-REP to the
instrument the following
connectors must be used CAB51F(1m), CAB-52F(2m), CAB55F(5m),
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 dirt or humidity. The same
recommendations apply to probes. Let air circulate by the
cooling holes.
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12. ELECTRICAL CONNECTIONS
The instrument is provided with screw terminal block to connect cables with a cross section up
2
to 2,5 mm
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.
2. When the controller is ON
3. Push “SET” key and the End will stop flashing.
4. Turn OFF
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)
1. Turn OFF the instrument.
2. Insert a programmed “Hot Key” into the 5 PIN receptacle and then turn the
3. Automatically the parameter list of the “Hot Key” is downloaded into the Controller
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
“P1” Room probe failure Compressor output acc. to par. “Con” and
“P3” Third probe failure Outputs unchanged
“P4” Fourth probe failure Outputs unchanged
“HA” Maximum temperature alarm Outputs unchanged.
“LA” Minimum temperature alarm Outputs unchanged.
"HA2" Condenser high temperature It depends on the “Ac2” parameter
"LA2" Condenser low temperature It depends on the “bLL” parameter
“dA” Door open Compressor according to rrd
“EA” External alarm Output unchanged.
“CA” Serious external alarm
“CA” Pressure switch alarm
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
PoF
noP
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
. Before connecting cables make sure the power supply complies with the
appears followed a by flashing “End”
the instrument remove the “Hot Key”, then turn it ON again.
Controller ON.
memory, the “doL” message is blinking followed a by flashing “End”.
Message Cause Outputs
(i1F=bAL)
(i1F=PAL)
Keyboard unlocked.
Keyboard locked
In programming mode: none parameter is present in Pr1
On the display or in dP2, dP3, dP4: the selected probe is nor enabled
, insert the “Hot key” and push 9 key; the "uPL" message
“COF”
All outputs OFF.
All outputs OFF
2
wiring.
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l
Display: 3 digits, red LED, 14,2 mm high; Inputs: Up to 4 NTC or PTC probes.
Digital input: free voltage contact
Relay outputs: compress or SPST 8(3) A, 250 Vac; or 20(8)A 250Vac
Data storing: on the non-volatile memory (EEPROM).
Kind of action: 1B; Pollution grade: 2;Software class: A.;
Rated impulsive voltage: 2500V; Overvoltage Category: II
Operating temperature: 0÷60 °C;Storage temperature: -30÷85 °C.
Relative humidity: 20÷85% (no condensing)
Measuring and regulation range: NTC probe: -40÷110°C (-40÷230°F);
Resolution: 0,1 °C or 1°C or 1 °F (selectable); Accuracy (amb ien t temp. 25°C) : ±1 °C ±1
digit
PTC probe: -50÷150°C (-58÷302°F)
Installing and Operating Instructions
16. CONNECTIONS
The X-REP output excludes the TTL output.. It’s present in the following codes:
XR20CX- xx2xx, XR20CX –xx3xx;
16.1 XR20CX – 8A COMPRESSOR
Room
9101112
8(3)A250V
12 3 6 7
N.C.
Comp
12Vac/dc supply: connect to the terminals 7 and 8.
24Vac/dc supply: connect to the terminals 7 and 8.
120Vac supply: connect to the terminals 7 and 8.
Line
8
Hot Key /IV Probe
TTL or X-REP output
16.2 XR20CX – 20A COMPRESSOR
Room
9101112
20(8)A250V
456 7
Comp
Line
12Vac/dc supply: connect to the terminals 7 and 8.
24Vac/dc supply: connect to the terminals 7 and 8.
120Vac supply: connect to the terminals 7 and 8.
8
Hot Key /IV Probe
TTL or X-REP output
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17. DEFAULT SETTING VALUES
Labe
Set
Set point LS÷US 3.0/37 - - -
Hy
Differential
LS
Minimum set point
US
Maximum set point
Ot
Thermostat probe calibration
P3P
Third probe presence n=not present; Y=pres. n Pr2
O3
Third probe calibration
P4P
Fourth probe presence n=not present; Y=pres. n Pr2
O4
Fourth probe calibration
OdS
Outputs delay at start up 0÷255 min 0 Pr2
AC
Anti-short cycle delay
CCt
Continuos cycle duration 0.0÷24.0h 0.0 Pr2
CCS Set point for continuous cycle (-55.0÷150,0°C) (-67÷302°F) 3/37 Pr2
COn
Compressor ON time with faulty probe
COF
Compressor OFF time with faulty
probe
CH
Kind of action CL=cooling; Ht= heating cL Pr1
CF
Temperature measurement unit
rES
Resolution
dLy Display temperature delay 0 ÷ 20.0 min (10 sec.) 0 Pr2
IdF
Interval between defrost cycles
MdF
(Maximum) length for defrost
dFd
Displaying during defrost
dAd MAX display delay after defrost 0 ÷ 255 min 30 Pr2
ALc
Temperat. alarms configuration
ALU
MAXIMUM temperature alarm
ALL
Minimum temperature alarm
AFH
Differential for temperat. alarm
recovery
ALd
Temperature alarm delay
dAo
Delay of temperature alarm at start up
AP2
Probe for temperat. alarm of
condenser
AL2 Condenser for low temperat. alarm (-55 ÷ 150°C) (-67÷ 302°F) -40/-40 Pr2
AU2 Condenser for high temperat. alarm (-55 ÷ 150°C) (-67÷ 302°F) 110/230 Pr2
Differ. for condenser temp. alar.
AH2
recovery
Ad2 Condenser temperature alarm delay 0 ÷ 254 (min.) , 255=nU 15 Pr2
Delay of cond. temper. alarm at start
dA2
up 0.0 ÷ 23h 50’
Compr. off for condenser low
bLL
temperature alarm n(0) - Y(1)
Compr. off for condenser high
AC2
temperature alarm n(0) - Y(1)
i1P
Digital input polarity oP=opening;CL=closing cL Pr1
i1F
Digital input configuration EAL, bAL, PAL, dor; dEF; Htr,
did
Digital input alarm delay 0÷255min 15 Pr1
nPS Number of activation of pressure
switch
odc
Compress status when open door no; Fan; CPr; F_C no Pr2
rrd
Regulation restart with door open
alarm
HES
Differential for Energy Saving (-30°C÷30°C) (-54°F÷54°F) 0/0 Pr2
Adr
Serial address 0÷247 1 Pr2
PbC
Kind of probe Ptc; ntc ntc Pr1
onF
on/off key enabling nu, oFF; ES ES Pr2
dP1
Room probe display -- -- Pr1
dP3
Third probe display -- -- Pr1
dP4
Fourth probe display -- -- Pr2
rSE
Real set point value actual set -- Pr2
rEL
Software release -- -- Pr2
Ptb
Map code -- -- Pr2
Name Range °C/°F
0,1÷25.5°C/ 1÷ 255°F
-50°C÷SET/-58°F÷SET
SET÷110°C/ SET ÷ 230°F
-12÷12°C /-120÷120°F
-12÷12°C /-120÷120°F
-12÷12°C /-120÷120°F
0 ÷ 50 min
0 ÷ 255 min
0 ÷ 255 min
°C ÷ °F
in=integer; dE= dec.point
1 ÷ 120 ore
0 ÷ 255 min
rt, it, SEt, DEF
rE= related to set;
Ab = absolute
Set÷110.0°C; Set÷230°F
-50.0°C÷Set/ -58°F÷Set
(0,1°C÷25,5°C) (1°F÷45°F)
0 ÷ 255 min
0 ÷ 23h e 50’
nP; P1; P2; P3; P4
[0,1°C ÷ 25,5°C] [1°F ÷
45°F]
AUS
0 ÷15
n – Y
2.0/4 Pr1
-50/-58 Pr2
110/230 Pr2
0.0/0 Pr1
0.0/0 Pr2
0.0/0 Pr2
1 Pr1
15 Pr2
30 Pr2
°C/°F Pr2
dE /in Pr1
8 Pr1
20 Pr1
it Pr2
Ab Pr2
110/230 Pr1
-50/-58 Pr1
½ Pr2
15 Pr2
1.3 Pr2
P4 Pr2
5/4 Pr2
1,3 Pr2
n Pr2
n Pr2
dor Pr1
15 Pr2
y Pr2
1592020022 XR20CX GB ES m&M r1.1 05.03.2007.doc XR20CX 4/4
Dixell S.p.A. Z.I. Via dell’Industria, 27
32010 Pieve d’Alpago (BL) ITALY
tel. +39 - 0437 - 98 33 - fax +39 - 0437 - 98 93 13
E-mail: dixell@dixell.com - http://www.dixell.com
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