Dixell
Installing and Operating Instructions
rel.1.0 –25/10/2000 - cod. 1592009540
1592009540 XW272K_full GB
XW272K
2/5
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
è
or
à
arrows within 10s.
4. To memorise the new set point value push the
SET key again or wait 10s.
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
è
or
à
to 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” +
à
. 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
è
or
à
.
3.
Press the “
SET” key to display its value (
and
LED starts blinking).
4.
Use
è
or
à
to 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
è
and
à
keys pressed together for more than 3 s the
è
and
à
keys.
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, the auxiliary output and the instrument.
TO UNLOCK THE KEYBOARD
Keep the
è
and
à
keys 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 and AUX buttons are active.
4.12
TO SEE THE PROBE VALUES
1.
Enter in “
Pr2” level.
2.
Select “
Prd” parameter with
è
or
à
.
3.
Press the “
SET” key to display “Pb1” label alternate with Pb1 value.
4.
Use
è
and
à
keys 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. (AUX and Light
can work)
CCO Compressors configuration : (Se,Al)
Se : The first compressor is always switched on before the second one.
Al : The compressors are switched on in an alternate way.
AC Anti-short cycle delay: (0÷30 min) interval between the compressor stop and the following restart.
AC1 Time delay between turning on compressor 1 and 2 : (0÷255 sec) allows to set the delay between
turning on the first and the second compressor.
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
Red Remote display : select which probe is displayed by the remote display (T620)
P1 = Thermostat probe; P2 = Evaporator probe; P3 = auxiliary 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: (-50,0÷110,0°C; -58÷230°F) (Enabled only when the evaporator
probe is present) sets the temperature measured by the 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 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.
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.
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)
