Emerson Dixell WING XW264K Wiring diagram

1592009550 XW264K GB r1.0 04.08.2015 XW264K 1/4 XW264K 1/4/
WING
XW264K
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.
Dixell Srl reserves the right to change the composition of its products, even without notice, ensuring the
same and unchanged functionality.
1.2 SAFETY PRECAUTIONS
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 avoiding sudden
temperature changes with high atmospheric humidity to prevent formation of condensation
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 opened.
In case of failure or faulty operation send the instrument back to the distributor or to “Dixell S.r.l.” (see
address) with a detailed description of the fault.
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 enough from each
other, without crossing or intertwining.
In case of applications in industrial environments, the use of mains filters (our mod. FT1) in parallel with
inductive loads could be useful.
2. GENERAL DESCRIPTION
Models XW264K, is microprocessor based controller suitable for applications on medium or low temperature
refrigerating units. They must be connected by means of a two-wire cable (1mm) at a distance of up to 30
meters to the keyboards T620, 185x38mm format, or V620 64x164mm format. It is provided with six relay
outputs to control compressor, two defrosts - which can be either electrical or hot gas - the evaporator fans, the
lights and an ON/OFF output. It is also provided with three NTC probe inputs, one for temperature control, two
to control the defrost end temperature of two evaporators. There are two digital inputs (free contact) for the door
switch and configurable by parameter.
The standard TTL output allows the user to connect, by means of a TTL/RS485 external module, a ModBUS-
RTU compatible monitoring system and to programme the parameter list with the “Hot Key”.
An output for remote display XW-REP, a 4÷20 mA output to control evaporator or condenser fans and the direct
serial output RS485 are available as options.
3. CONTROLLING LOADS
3.1 THE 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 FAST FREEZING
When defrost is not in progress, it can be activated the keypad by holding the okey pressed for about 3
seconds. The compressor operates in continuous mode 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, ofor about 3 seconds.
3.3 DEFROST
Three defrost modes are available through the “tdF” parameter: defrost with electrical heater, hot gas or
thermostatic defrost. The defrost interval is control by means of parameter “EdF”: (EdF=in) the defrost is made
every “IdF” time, (EdF=Sd) the interval “IdF” is calculate through Smart Defrost algorithm (only when the
compressor is ON and the evaporator temperature is bigger than “SdF” parameter).
At the end of defrost the drip time is controlled through the “Fdt” parameter.
This instrument can menage a defrost on two different evaporators. It waits the defrost end on both evaporators
before starting normal regulation
3.4 CONTROL OF EVAPORATOR FANS
The fan control mode is selected by means of the “FnC” parameter:
C-n fans will switch ON and OFF with the compressor and not run during defrost;
C-y fans will switch ON and OFF with the compressor, also during defrost
After defrost, there is a timed fan delay allowing for drip time, set by means of the “Fnd” parameter.
O-n fans will run continuously and not run during defrost;
O-y fans will run continuously also during defrost
An additional parameter “FSt” provides the setting of temperature, detected by the evaporator probe, above
which the fans are always OFF. This can be used to make sure circulation of air only if his temperature is lower
than set in “FSt”.
3.5 ON/OFF RELAY
The ON/OFF relay is switched ON when the instrument is ON and it is OFF when the instrument is switched
OFF. This relay cuts the common of the defrost relays, so that, when the instrument is switched OFF by
keyboard button none of the loads have power supply.
4. KEYBOARD
To display and modify target set point; in programming mode it selects a parameter or confirm an
operation.
By holding it pressed for 3s when max or min temperature is displayed it will be erased.
To see the max. stored temperature; in programming mode it browses the parameter codes or
increases the displayed value. By holding it pressed for 3s the fast freezing cycle is started.
To see the min stored temperature; in programming mode it browses the parameter codes or
decreases the displayed value.
By holding it pressed for 3s the defrost is started.
Switch ON and OFF the cold room light.
Switch ON and OFF the instrument.
KEY COMBINATIONS
+
To lock and unlock the keyboard.
+
To enter the programming mode.
+
To exit the programming mode.
4.1 USE OF LEDS
Each LED function is described in the following table.
LED
MODE
Function
ON
The compressor is running
FLASHING
- Programming Phase (flashing with LED )
- Anti-short cycle delay enabled
ON
The fan is running
FLASHING
Programming Phase (flashing with LED )
ON
The defrost is enabled
FLASHING
Drip time in progress
ON
The Fast Freezing cycle is enabled
ON
- ALARM signal
- In “Pr2” indicates that the parameter is also present in “Pr1”
Function of the LEDs placed on the left top side of buttons:
BUTTON
MODE
FUNCTION
SET
FLASHING
The Set point is displayed and it can be modified
SET
SLOW FLASHING
The Energy Saving is enabled
DEFROST
ON
The Manual Defrost is activated
LIGHT
ON
The Light is ON
ON/OFF
ON
The instrument is OFF
4.2 HOW TO SEE THE MIN TEMPERATURE
1. Press and release the nkey.
2. The “Lo” message will be displayed followed by the minimum temperature recorded.
3. By pressing the nkey or waiting for 5s the normal display will be restored.
4.3 HOW TO SEE THE MAX TEMPERATURE
1. Press and release the okey.
2. The “Hi” message will be displayed followed by the maximum temperature recorded.
3. By pressing the okey or waiting for 5s the normal display will be restored.
4.4 HOW TO RESET THE MAX AND MIN TEMPERATURE RECORDED
To reset the stored temperature, when max or min temperature is displayed :
1. Press SET key until “rST” label starts blinking.
N.B. After the installation RESET the temperature stored .
4.5 HOW TO SEE AND MODIFY THE SET POINT
1. Push and immediately release the SET key: the display will show the Set point value;
2. The SET LED start blinking;
3. To change the Set value push the o or narrows within 10s.
4. To memorise the new set point value push the SET key again or wait 10s.

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4.6 TO START A MANUAL DEFROST
1. Push the DEF key for more than 2 seconds and a manual defrost will start.
4.7 TO ENTER IN PARAMETERS LIST “PR1”
To enter the parameter list “Pr1” (user accessible parameters) operate as follows:
1. Enter the Programming mode by pressing the Set and DOWN key for few
seconds ( and start blinking).
2. The instrument will show the first parameter present in “Pr1”
4.8 TO ENTER IN PARAMETERS LIST “PR2”
To access parameters in “Pr2”:
1. Enter the “Pr1” level.
2. Select “Pr2” parameter and press the “SET” key.
3. The “PAS” flashing message is displayed, shortly followed by “0 - -” with a flashing zero.
4. Use oor nto input the security code in the flashing digit; confirm the figure by pressing “SET”. The
security code is “321“.
5. If the security code is correct the access to “Pr2” is enabled by pressing “SET” on the last digit.
Another possibility is the following: after switching ON the instrument the user can push Set and DOWN keys
within 30 seconds.
NOTE: each parameter in “Pr2” can be removed or put into “Pr1” (user level) by pressing “SET” + n. When a
parameter is present in “Pr1” LED is on.
4.9 HOW TO CHANGE THE PARAMETER VALUE
1. Enter the Programming mode.
2. Select the required parameter with oor n.
3. Press the “SET” key to display its value ( and LED starts blinking).
4. Use oor nto change its value.
5. 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 new programming is stored even when the procedure is exited by waiting the time-out.
4.10 HOW TO LOCK THE KEYBOARD
1. Keep the oand nkeys pressed together for more than 3 s the oand nkeys.
2. The “POF” message will be displayed and the keyboard is locked. At this point it is only
possible the viewing of the set point or the MAX o Min temperature stored and to switch ON
and OFF the light and the instrument.
TO UNLOCK THE KEYBOARD
Keep the oand nkeys pressed together for more than 3s.
4.11 ON/OFF FUNCTION
By pushing the ON/OFF key, the instrument shows “OFF” for 5 sec. and the ON/OFF LED is
switched ON.
During the OFF status, all the relays are switched OFF and the regulations are stopped; if a
monitoring system is connected, it does not record the instrument data and alarms.
N.B. During the OFF status the Light button is active.
4.12 TO SEE THE PROBE VALUES
1. Enter in “Pr2”level.
2. Select “Prd” parameter with oor n.
3. Press the “SET” key to display “Pb1” label alternate with Pb1 value.
4. Use o and nkeys to display the other probe values.
5. Press “SET” to move to the following parameter.
5. PARAMETER LIST
REGULATION
Hy Differential: (0,1÷25,5°C; 1÷45°F): Intervention differential for set point, always positive. Compressor
Cut IN is Set Point Plus Differential (Hy). Compressor Cut OUT is when the temperature reaches the set
point.
LS Minimum set point limit: (-50,0°C

SET; -58°F÷SET) Sets the minimum acceptable value for the set
point.
US Maximum set point limit: (SET

110°C; SET÷230°F) Set the maximum acceptable value for set point.
OdS Outputs activation delay at start up: (0÷255 min) 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. (Light can work)
AC Anti-short cycle delay: (0÷30 min) interval between the compressor stop and the following restart.
CCt Thermostat override: (0min ÷23h 50min) allows to set the length of the continuous cycle. Can be used,
for instance, when the room is filled with new products.
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.
DISPLAY
CF Temperature measurement unit: °C = Celsius; °F = Fahrenheit . When the measurement unit is
changed the SET point and the values of the regulation parameters have to be modified
rES Resolution (for °C): (in = 1°C; de = 0,1°C) allows decimal point display.
de = 0,1°C; in = 1 °C
Lod Local display : select which probe is displayed by the instrument:
P1 = Thermostat probe; P2 = Evaporator probe; P3 = 2nd evaporator probe
1r2 = difference between P1 and P2 (P1-P2)
Red Remote display : select which probe is displayed by the remote display (XW-REP)
P1 = Thermostat probe; P2 = Evaporator probe; P3 = 2nd evaporator probe
1r2 = difference between P1 and P2 (P1-P2)
DEFROST
tdF Defrost type:
rE = electrical heater (Compressor OFF)
rT = thermostat defrost. During the defrost time “MdF”, the heater switches On and OFF depending on the
evaporator temperature and “dtE” value.
in = hot gas (Compressor and defrost relays ON)
EdF Defrost mode:
in = interval mode. The defrost starts when the time “Idf” is expired.
Sd = Smartfrost mode. The time IdF (interval between defrosts) is increased only when the compressor
is running (even non consecutively) and only if the evaporator temperature is less than the value in "SdF”
(set point for SMARTFROST).
SdF Set point for SMARTFROST: (-30

30 °C/ -22

86 °F) evaporator temperature which allows the IdF
counting (interval between defrosts) in SMARTFROST mode.
dtE Defrost termination temperature 1st evaporator: (-50,0÷110,0°C; -58÷230°F) (Enabled only when the
evaporator probe is present) sets the temperature measured by the first evaporator probe which causes
the end of defrost.
dtS Defrost termination temperature 2nd evaporator: (-50,0÷110,0°C; -58÷230°F) (Enabled only when the
2nd evaporator probe is present) sets the temperature measured by the 2nd evaporator probe which causes
the end of defrost.
idF Interval between defrosts: (1÷120h) Determines the time interval between the beginning of two defrost
cycles.
MdF (Maximum) duration of first defrost: (0÷255 min) When P2P = n, no evaporator probe, it sets the
defrost duration, when P2P = y, defrost end based on temperature, it sets the maximum length for defrost.
MdS (Maximum) duration of second defrost: (0÷255 min) When P3P = n, no 2nd evaporator probe, it sets
the defrost duration, when P3P = y, 2nd defrost end based on temperature, it sets the maximum length for
2nd defrost.
dFd Display during defrost:
rt = real temperature; it = temperature reading at the defrost start; Set = set point; dEF = “dEF” label;
dEG = “dEG” label;
dAd Defrost display time out: (0

255 min) Sets the maximum time between the end of defrost and the
restarting of the real room temperature display.
dSd Start defrost delay: ( 0÷99min) This is useful when different defrost start times are necessary to avoid
overloading the plant.
Fdt Drain down time: (0÷60 min.) time interval between reaching defrost termination temperature and the
restoring of the control’s normal operation. This time allows the evaporator to eliminate water drops that
might have formed due to defrost.
dPO First defrost after start-up:
y = Immediately; n= after the IdF time
dAF Defrost delay after fast freezing: (0min÷23h 50min) after a Fast Freezing cycle, the first defrost will be
delayed for this time.
FANS
FnC Fan operating mode:
C-n = running with the compressor, OFF during the defrost;
C-y = running with the compressor, ON during the defrost;
O-n = continuous mode, OFF during the defrost;
O-y = continuous mode, ON during the defrost;
Fnd Fan delay after defrost: (0÷255 min) The time interval between the defrost end and evaporator fans start.
FSt Fan stop temperature: (-50÷110°C; -58÷230°F) setting of temperature, detected by evaporator probe,
above which the fan is always OFF.
ALARMS
ALC Temperature alarm configuration
rE = High and Low alarms related to Set Point
Ab = High and low alarms related to the absolute temperature.
ALU High temperature alarm setting: ( ALC= rE, 0

50°C or 90°F; ALC= Ab, ALL

110°C or 230°F)
when this temperature is reached and after the ALd delay time the HA alarm is enabled.
ALL Low temperature alarm setting: ( ALC = rE , 0

50 °C or 90°F; ALC = Ab , - 50°C or -58°F

ALU)
when this temperature is reached and after the ALd delay time, the LA alarm is enabled,.
AFH Temperature alarm and fan differential: (0,1÷25,5°C; 1÷45°F) Intervention differential for temperature
alarm set point and fan regulation set point, always positive.
ALd Temperature alarm delay: (0÷255 min) time interval between the detection of an alarm condition and the
corresponding alarm signalling.
dAO Delay of temperature alarm at start-up: (0min÷23h 50min) time interval between the detection of the
temperature alarm condition after the instrument power on and the alarm signalling.
EdA Alarm delay at the end of defrost: (0

255 min) Time interval between the detection of the temperature
alarm condition at the end of defrost and the alarm signalling.
dot Delay of temperature alarm after closing the door : (0

255 min) Time delay to signal the temperature
alarm condition after closing the door.
doA Open door alarm delay:(0÷254min,nu) delay between the detection of the open door condition and its
alarm signalling: the flashing message “dA” is displayed. If doA=nu the door alarm will be not signalled.
nPS Pressure switch number: (0

15) Number of activation of the pressure switch, during the “did” interval,
before signalling the alarm event (I2F= PAL).
ANALOGUE OUTPUT 4÷20 mA (OPTIONAL)
AOS Analogue output start point: (-50÷110°C or -58°÷230°F). Sets the temperature at which the analogue
output begins.
APB Analogue output band width:(-50÷110°C or -58°÷230°F) sets the width of the regulation band for the
analogue output. If APb is positive then it is above the start point and the kind of action is direct
(condenser application). If APb is negative then it is below the start point and the kind of action is inverse
(evaporator application).
CAO Input type for the analogue output: four input types can be selected:
P1 = room probe temperature; P2 = evaporator probe temperature; P3 = temperature of the third probe
1r2= temperature difference between the room probe and the evaporator probe
PROBE INPUTS
Ot Thermostat probe calibration: (-12.0

12.0°C/ -21

21°F) allows to adjust possible offset of the
thermostat probe.
OE 1st Evaporator probe calibration: (-12.0

12.0°C/ -21

21°F) allows to adjust possible offsets of the
evaporator probe.
O3 2nd Evaporator probe calibration: (-12.0

12.0°C/ -21

21°F) allows to adjust possible offsets of the 2nd
evaporator probe.
P2P 1st Evaporator probe presence:
n= not present: the defrost stops only by time; y= present: the defrost stops by temperature and time.
P3P 2nd Evaporator probe presence: n= not present; y= present.
HES Temperature increase during the Energy Saving cycle : (-30,0°C

30,0°C / -22÷86°F) sets the
increasing value of the set point during the Energy Saving cycle.

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DIGITAL INPUTS
odc Compressor and fan status when open door:
no = normal; Fan = Fan OFF; CPr = Compressor OFF; F_C = Compressor and fan OFF.
I1P Door switch input polarity: CL : the digital input is activated by closing the contact;
OP : the digital input is activated by opening the contact.
I2P Configurable digital input polarity:
CL : the digital input is activated by closing the contact;
OP : the digital input is activated by opening the contact
I2F Digital input operating mode: configure the digital input function:
EAL = generic alarm; bAL = serious alarm mode; PAL = Pressure switch; dFr = Start defrost;
AUS = Not used; Es = Energy Saving; onF = remote On/OFF.
did Time interval/delay for digital input alarm:(0

255 min.) Time interval to calculate the number of the
pressure switch activation when I2F=PAL. If I2F=EAL or bAL (external alarms), “did” parameter defines
the time delay between the detection and the successive signalling of the alarm.
OTHER
Adr RS485 serial address (1÷247): Identifies the instrument address when connected to a ModBUS
compatible monitoring system.
rEL Release software: (read only) Software version of the microprocessor.
Ptb Parameter table: (read only) it shows the original code of the Dixell parameter map.
Prd Probes display: (read only) display the temperature values of the evaporator probes Pb2 and Pb3.
Pr2 Access to the protected parameter list (read only).
6. DIGITAL INPUTS
The Wing series can support up to 2 free contact digital inputs. One is always configured as door switch, the
second is programmable in seven different configurations by the “I2F” parameter.
6.1 DOOR SWITCH INPUT
It signals the door status and the corresponding relay output status through the “odc” parameter:
no = normal (any change);
Fan = Fan OFF;
CPr = Compressor OFF;
F_C = Compressor and fan OFF.
Since the door is opened, after the delay time set through parameter “dOA”, the alarm output is enabled and the
display shows the message “dA”. The alarm stops as soon as the external digital input is disabled again. During
this time and then for the delay “dot” after closing the door, the high and low temperature alarms are disabled.
6.2 CONFIGURABLE INPUT - GENERIC ALARM (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.
6.3 CONFIGURABLE INPUT - SERIOUS ALARM MODE (BAL)
When the digital input is activated, the unit will wait for “did” delay before signalling the “BAL” alarm message.
The relay outputs are switched OFF. The alarm will stop as soon as the digital input is de-activated.
6.4 CONFIGURABLE INPUT - PRESSURE SWITCH (PAL)
If during the interval time set by “did” parameter, the pressure switch has reached the number of activation of
the “nPS” parameter, the “PAL” pressure alarm message will be displayed. The compressor and the regulation
are stopped. When the digital input is ON the compressor is always OFF.
6.5 CONFIGURABLE INPUT - START DEFROST (DFR)
It executes 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.
6.6 CONFIGURABLE INPUT - ENERGY SAVING (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.
6.7 CONFIGURABLE INPUT - REMOTE ON/OFF (ONF)
This function allows to switch ON and OFF the instrument.
6.8 DIGITAL INPUTS POLARITY
The digital inputs polarity depends on “I1P” and “I2P” parameters.
CL : the digital input is activated by closing the contact.
OP : the digital input is activated by opening the contact
7. INSTALLATION AND MOUNTING
Keyboard T620 shall be mounted on vertical panel, in a 150x31 mm hole, and fixed using two screws

3 x
2mm. To obtain an IP65 protection grade use the front panel rubber gasket (mod. RG-L).
Keyboard V620 shall be mounted on vertical panel, in a 72x56 mm hole, and fixed using screws

3 x 2mm. To
obtain an IP65 protection grade use the front panel rubber gasket (mod. RGW-V).
Instrument XW264K shall be mounted in a panel with two or more screws and it must be connected to the
keyboard by means of a two-wire cable (1mm). 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 the air circulate by the cooling holes.
7.1 T620 CUT OUT
165
150
31
+0.5
-0
+0.5
-0
+1
-1
Ø3 x2
7.2 V620: CUT OUT
56
72
40
83,5
7.3 MOUNTING WITH KEYBOARD COVER OPENING DOWNWARD
CLICK!
1
2
2
3
3
1
1
7.4 MOUNTING WITH KEYBOARD COVER OPENING UPWARD
CLICK!
1
2
2
2
3
3
1
1
8. ELECTRICAL CONNECTIONS
The instruments are provided with screw terminal block to connect cables with a cross section up to 2,5 mm2 for
the digital and analogue inputs. Relays and power supply have a Faston connection (6,3mm). Heat-resistant
cables have to be used. 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.
N.B. Maximum current allowed for all the loads is 20A.
8.1 PROBE CONNECTIONS
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 probes among the evaporators fins in the coldest places, where most
ice is formed, far from heaters or from the warmest place during defrost, to prevent premature defrost
termination.
9. TTL SERIAL LINE
The TTL connector allows, by means of the external module TTL/RS485, to connect the unit to a network line
ModBUS-RTU compatible as the Dixell monitoring system XJ500 (Version 3.0).
The same TTL connector is used to upload and download the parameter list of the “HOT KEY“. These
instruments can be ordered with direct serial output RS485 (Optional).
10. USE OF THE PROGRAMMING “HOT KEY “
The Wing units can UPLOAD or DOWNLOAD the parameter list from its own E2 internal memory to the “Hot
Key” and vice-versa.
10.1 DOWNLOAD (FROM THE “HOT KEY” TO THE INSTRUMENT)
1. Turn OFF the instrument by means of the ON/OFF key, remove the TTL serial cable if present, insert
the “Hot Key” and then turn the Wing ON.
2. Automatically the parameter list of the “Hot Key” is downloaded into the Wing memory, the “DoL”
message is blinking. After 10 seconds the instrument will restart working with the new parameters.
3. Turn OFF the instrument remove the “Hot Key”, plug in the TTL serial cable, then turn it ON again.
At the end of the data transfer phase the instrument displays the following messages:
“end “ for right programming. The instrument starts regularly with the new programming.

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“err” 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.
10.2 UPLOAD (FROM THE INSTRUMENT TO THE “HOT KEY”)
1. Turn OFF the instrument by means of the ON/OFF key and remove the TTL serial cable if present; then
turn it ON again.
2. When the Wing unit is ON, insert the “Hot key” and push okey; the "uPL" message appears.
3. Push “SET” key to start the UPLOAD; the “uPL” message is blinking.
4. Turn OFF the instrument remove the “Hot Key”, plug in the TTL serial cable, then turn it ON again.
At the end of the data transfer phase the instrument displays the following messages:
“end “ for right programming.
“err” for failed programming. In this case push “SET” key if you want to restart the programming again or
remove the not programmed “Hot key”.
11. ALARM SIGNALS
Message
Cause
Outputs
“P1”
Thermostat probe failure
Alarm output ON; Compressor output according to
parameters “COn” and “COF”
“P2”
1st Evaporator probe failure
Alarm output ON; Other outputs unchanged
“P3”
2nd Evaporator probe failure
Alarm output ON; Other outputs unchanged
“HA”
Max. temperature alarm
Alarm output ON; Other outputs unchanged
“LA”
Min. temperature alarm
Alarm output ON; Other outputs unchanged
“EE”
Data or memory failure
Alarm output ON; Other outputs unchanged
“dA”
Defrost timeout alarm
Alarm output ON; Other outputs unchanged
“dAL”
Door switch alarm
Alarm output ON; Other outputs unchanged
“EAL”
External alarm
Alarm output ON; Other outputs unchanged
“BAL”
Serious external alarm
Alarm output ON; Other outputs OFF
“PAL”
Pressure switch alarm
Alarm output ON; Other outputs OFF
The alarm message is displayed until the alarm condition is recovery.
All the alarm messages are showed alternating with the room temperature except for the “P1” which is flashing.
To reset the “EE” alarm and restart the normal functioning press any key, the “rSt” message is displayed for
about 3s.
11.1 SILENCING BUZZER
Once the alarm signal is detected the buzzer can be silenced by pressing any key.
11.2 “EE” ALARM
The Dixell instruments are provided with an internal check for the data integrity. Alarm “EE” flashes when a
failure in the memory data occurs. In such cases the alarm output is enabled.
11.3 ALARM RECOVERY
Probe alarms : “P1” (probe1 faulty), “P2” and “P3”; they automatically stop 10s after the probe restarts normal
operation. Check connections before replacing the probe.
Temperature alarms “HA” and “LA” automatically stop as soon as the thermostat temperature returns to normal
values or when the defrost starts.
Door switch alarm “dA” stop as soon as the door is closed.
External alarms “EAL”, “BAL” stop as soon as the external digital input is disabled “PAL” alarm is recovered by
switching OFF the instrument.
12. TECHNICAL DATA
T820 keyboard
Housing: self extinguishing ABS.
Case: T620 facia 38x185 mm; depth 23mm; V620 facia 64x164 mm; depth 23mm
Mounting : T620 panel mounting in a 150x31 mm panel cut-out with two screws.

3 x 2mm.
Distance between the holes 165mm
V620: panel mounting in a 56x72 mm panel cut-out with two screws.

3x2mm. Distance between the
holes 40mm
Protection: IP20; Frontal protection: IP65 with frontal gasket mod RG-L. (optional)
Connections: Screw terminal block

2,5 mm2heat-resistant wiring and 6,3mm
Power supply: from XW230K power module
Display: 3 digits, red LED, 14,2 mm high; Optional output: buzzer
Power module XW264K
Housing: self extinguishing ABS; Case: facia 38x185 mm; depth 76mm
Mounting: panel mounting in a 150x31 mm panel cut-out with two screws.

3 x 2mm.
Distance between the holes 165mm
Protection: IP20.
Frontal protection: IP65 with frontal gasket mod RG-L. (optional)
Connections: Screw terminal block

2,5 mm2heat-resistant wiring and 6,3mm Faston; Optional
disconnectable terminal blocks (max.12A)
Power supply: 230Vac or. 110Vac

10%; Power absorption: 7VA max.
Display: 3 digits, red LED, 14,2 mm high; Inputs: 3 NTC probes
Digital inputs: 2 free voltage
Relay outputs: Total current on loads MAX. 20A
compressor: relay SPST 8(3) A, 250Vac
light: relay SPST 16(3) A, 250Vac (or optional relay SPST 16(3) A, special for fluorescent lights)
fans: relay SPST 8(3) A, 250Vac
1st defrost: relay SPDT 8(3) A, 250Vac
2nd defrost : relay SPDT 8(3) A, 250Vac
ON/OFF: SPST relay 16(3) A, 250Vac
Other output: Alarm buzzer (Standard)
Direct RS485 (optional)
Serial output : TTL standard; Communication protocol: Modbus - RTU
Data storing: on the non-volatile memory (EEPROM).
Kind of action: 1B; Pollution grade: normal; Software class: A.
Operating temperature: 0÷60 °C; Storage temperature: -25÷60 °C.
Relative humidity: 20

85% (no condensing)
Measuring and regulation range: NTC probe: -40÷110°C (-58÷230°F)
Resolution: 0,1 °C or 1°C or 1 °F (selectable).
Accuracy (ambient temp. 25°C): ±0,5 °C ±1 digit
13. CONNECTIONS
13.1 XW264K
L
19 18 15 142022 21
Comp
N
16(6)A
Light
1 2 3 4 6 87 910
Kbrd
Def.1
Room
Def.2
5
131617
Def1 Fan
12 112324
8(3)A
8(3)A8(3)A
250V~
8(3)A
Def2
16(6)A
Supply: 230Vac or 120Vac or 24Vac according to the model
14. DEFAULT SETTING VALUES
Label
Name
Range
Default
Level
REGULATION
°C/°F
Set
Set point
LS÷US
-5/23
Pr1
Hy
Differential
0,1÷25,5 °C; 1÷45°F
2/4
Pr1
LS
Minimum set point
-50,0°C÷SET; -58°F÷SET
-30/-22
Pr2
US
Maximum set point
SET ÷ 110°C, SET ÷ 230°F
20/68
Pr2
OdS
Outputs activation delay at start up
0÷255 min.
1
Pr2
AC
Anti-short cycle delay
0÷30 min.
1
Pr1
CCt
Compressor ON time during fast freezing
0 ÷ 23h 50 min.
0
Pr2
COn
Compressor ON time with faulty probe
0÷255 min.
15
Pr2
COF
Compressor OFF time with faulty probe
0÷255 min.
30
Pr2
DISPLAY
CF
Temperature measurement unit
°C ÷ °F
°C/°F
Pr2
rES
Resolution (integer/decimal point)
in ÷ de
de
Pr1
Lod
Local display
P1 ÷ 1r2
P1
Pr2
Red
Remote display
P1 ÷ 1r2
p1
Pr2
DEFROST
tdF
Defrost type
rE, rT, in
rE
Pr1
EdF
Defrost mode
In, Sd
In
Pr2
SdF
Set point for SMART DEFROST
-30 ÷ +30°C; -22÷+86°F
0
Pr2
dtE
Defrost termination temperature (1°Evaporator)
-50,0÷110°C; -58÷230°F
8/46
Pr1
dtS
Defrost termination temperature (2°Evaporator)
-50,0÷110°C; -58÷230°F
8/46
Pr1
IdF
Interval between defrost cycles
1÷120h
6
Pr1
MdF
(Maximum) length for 1° defrost
0÷255 min.
30
Pr1
MdS
(Maximum) length for 2° defrost
0÷255 min.
30
Pr1
dFd
Displaying during defrost
rt, it, SEt, dEF, dEG
it
Pr2
dAd
MAX display delay after defrost
0÷255 min.
30
Pr2
dSd
Defrost delay
0÷99min
0
Pr2
Fdt
Draining time
0÷60 min.
0
Pr2
dPO
First defrost after start up
n ÷ y
n
Pr2
dAF
Defrost delay after fast freezing
0 ÷ 23h 50 min.
2
Pr2
FANS
FnC
Fans operating mode
C-n, C-y, O-n, O-y
O-n
Pr2
Fnd
Fans delay after defrost
0÷255 min.
10
Pr2
FSt
Fans stop temperature
-50,0÷110°C; -58÷230°F
2/35
Pr2
ALARMS
ALC
Temperature alarms configuration
rE÷Ab
rE
Pr2
ALU
MAXIMUM temperature alarm
-50,0÷110°C; -58÷230°F
10/20
Pr1
ALL
minimum temperature alarm
-50,0÷110°C; -58÷230°F
10/20
Pr1
AFH
Temperature alarm and fan differential
0,1÷25,5 °C; 1÷45°F
2/4
ALd
Temperature alarm delay
0÷255 min.
15
Pr2
dAO
Delay of temperature alarm at start up
0 ÷ 23h 50 min.
1,3
Pr2
EdA
Alarm delay at the end of defrost
0÷255 min.
30
Pr2
dot
Delay of temperature alarm after closing the door
0÷255 min.
15
Pr2
dOA
Open door alarm delay
0÷254 min.,nu
15
Pr2
nPS
Pressure switch activation number
0÷15
0
Pr2
ANALOGUE INPUTS
Ot
Thermostat probe calibration
-12,0÷12,0°C; -21÷21°F
0
Pr1
OE
1st evaporator probe calibration
-12,0÷12,0°C; -21÷21°F
0
Pr2
O3
2nd evaporator probe calibration
-12,0÷12,0°C; -21÷21°F
0
Pr2
P2P
1st evaporator probe presence
n ÷ y
y
Pr2
P3P
2nd evaporator probe presence
n ÷ y
n
Pr2
HES
Temperature increase during the En. Saving cycle
-30÷30°C; -22÷86°F
0
Pr2
DIGITAL INPUTS
Odc
Open door control
no, Fan, CPr, F_C
Fan
Pr2
I1P
Door switch polarity
CL÷OP
CL
Pr2
I2P
Configurable digital input polarity
CL÷OP
CL
Pr2
i2F
Digital input configuration
EAL, bAL, PAL,
dFr, AUS, ES, OnF
EAL
Pr2
dId
Digital input alarm delay
0÷255 min.
5
Pr2
OTHER
Adr
Serial address
0÷247
1
Pr1
rEL
Software release
- - -
1.0
Pr2
Ptb
Map code
- - -
- - -
Pr2
Prd
Probes display
Pb1÷Pb3
- - -
Pr2
Pr2
Access parameter list
- - -
- - -
Pr2