1598024001 XR44CX ISA GB r2.0 21.06.2012.doc
XR44CX
2/4
6.
MAIN FUNCTIONS
6.1
HOW TO: SEE THE SET POINT
1.
Push and immediately release the SET key: the display will show the Set
point value.
2.
Push and immediately release the SET key or wait for 5 sec to display
the probe value again.
6.2
HOW TO CHANGE THE SET POINT
1.
Push the SET key more than 2 sec to change the Set point value.
2.
The value of the set point will be displayed and the “°C” or “°F” LED will start blinking.
3.
To change the Set value push the UP
or DOWN arrows within 10 sec.
4.
To save the new set point value, push the SET key again or wait for 10 sec.
6.3
HOW TO START A MANUAL DEFROST
Push the DEF key for more than 2 sec and a manual defrost will start.
6.4
HOW TO: CHANGE A PARAMETER VALUE
To change a parameter value, operate as follows:
1.
Enter the Programming mode by pressing the SET+DOWN buttons for 3s (the °C or °F LED will
start blinking).
2.
Select the required parameter. Press the SET button to display its actual value.
3.
Use UP or DOWN buttons to change its value.
4.
Press SET button to store the new value and move to the following parameter.
To exit: Press SET + UP buttons or waiting for 15s without pressing any key.
NOTE: the set value is stored even when the procedure is exited by waiting for 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 mode by pressing the SET+DOWN buttons for 3 sec (the °C or °F LED
will start blinking).
2.
Released the buttons and then push again the SET+DOWN buttons for more than 7s. The Pr2
label will be displayed immediately followed from the HY parameter.
Now it is possible to browse the hidden menu.
3.
Select the required parameter.
4.
Press the SET button to display its value.
5.
Use UP or DOWN to change its value.
6.
Press SET to store the new value and move to the following parameter.
To exit: Press SET+DOWN or wait 15 sec without pressing a key.
NOTE1: if no parameter is present in Pr1 menu, after 3 sec the “noP” message will be displayed.
Keep the buttons pushed till the Pr2 message will be displayed.
NOTE2: the set value is stored even when the procedure is exited by waiting for 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 (Pr2) can be moved into the user level (Pr1) by pressing
SET+DOWN buttons. If a parameter is part of the user level, when showed in the hidden menu the
decimal point will be lit.
6.6
HOW TO: LOCK THE KEYBOARD
1.
Keep both UP and DOWN buttons pressed for more than 3 sec.
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 button is pressed more than 3 sec the “PoF” message will be displayed
6.7
HOW TO: UNLOCK THE KEYBOARD
Keep pressed together for more than 3 sec the UP
and DOWN 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 UP key pressed for about 3 sec.
The compressor operates to maintain the CCS set point 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 UP for 3
sec.
6.9
THE ON/OFF FUNCTION
With “onF = oFF”, pushing the ON/OFF key, the instrument is switched off. The “OFF”
message is displayed. In this configuration, the regulation is disabled.
To switch the instrument on, push again the ON/OFF key.
WARNING: Loads connected to the normally closed contacts of the relays are always
supplied and under voltage, even if the instrument is in stand by mode.
7.
PARAMETERS
REGULATION
HY
Differential: (0.1 to 25.5°C; 1 to 45°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: (-55°C to SET; -67°F to SET) sets the minimum value for the set
point.
US
Maximum set point: (SET to 150°C; SET to 302°F) set the maximum value for set
point.
ot
Thermostat probe calibration: (-12.0 to 12.0°C; -21 to 21°F) allows to adjust possible
offset of the thermostat probe.
P2P
First evaporator probe presence: (n; Y) n = not present, the defrost stops by time;
Y = present, the defrost stops by temperature.
oE
First evaporator probe calibration: (-12.0 to 12.0°C; -21 to 21°F) allows to adjust
possible offset of the evaporator probe.
P3P
Second evaporator probe presence (P3): (n; Y) n = not present, the terminals
operate as digital input; Y = present, the terminals operate as third probe.
o3
Second evaporator probe calibration (P3): (-12.0 to 12.0°C; -21 to 21°F) allows to
adjust possible offset of the third probe.
odS
Outputs activation delay at start up: (0 to 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 for first compressor: (0 to 50 min) minimum interval between
the compressor stop and the following restart.
AC1
Anti-short cycle delay for second compressor: (0 to 50 min) minimum interval
between the compressor stop and the following restart.
CCt
Compressor ON time during continuous cycle: (0.0 to 24h00min, res. 10 min)
allows to set the length of the continuous cycle. Compressor stays on without
interruption during CCt time. This is useful, for instance, when the room is filled with
new products.
CCS
Set point for continuous cycle: (-55 to 150°C; -67 to 302°F) it sets the set point
used during the continuous cycle.
Con
Compressor ON time with faulty probe: (0 to 255min) 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 to 255min) 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; °F) °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.
Lod
Instrument display: (P1; P2, P3, P4, SET, dtr) it selects which probe is displayed by
the instrument. P1 = Thermostat probe; P2 = Evaporator probe; P3 = Third probe (only
for model with this option enabled); P4 = Fourth probe, SET = set point; dtr =
percentage of visualization.
DEFROST
tdF
Defrost type: (EL; in) EL = electrical heater; in = hot gas.
dtE
First defrost termination temperature: (-55 to 50°C; -67 to 122°F) (enabled only
when EdF=Pb) sets the temperature measured by the evaporator probe, which causes
the end of defrost.
dtS
Second defrost termination temperature: (-55 to 50°C; -67 to 122°F) (enabled only
when EdF=Pb) sets the temperature measured by the evaporator probe, which causes
the end of defrost.
idF
Interval between defrost cycles: (0 to 120 hours) determines the interval of time
between two defrost cycles.
MdF (Maximum) length for first defrost: (0 to 255 min) 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.
MdS (Maximum) length for second defrost: (0 to 255 min) 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.
dSd
Start defrost delay: (0 to 99 min) this is useful when different defrost start times are
necessary to avoid overloading the plant.
dFd
Temperature displayed during defrost: (rt; it; SEt; dEF) rt = real temperature;
it = temperature at defrost start; SEt = set point; dEF = “dEF” label.
dAd
MAX display delay after defrost: (0 to 255 min) sets the maximum time between the
end of defrost and the restarting of the real room temperature display.
Fdt
Drip time: (0 to 120 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: (n; Y)
n = after the idF time,
Y = immediately.
dAF
Defrost delay after continuous cycle: (0.0 to 24h00min, res. 10min) time interval
between the end of the fast freezing cycle and the following defrost related to it.
FANS
FnC
Fans operating mode: (C-n; o-n; C-Y; o-Y) C-n = runs with the compressor, OFF
during defrost; o-n = continuous mode, OFF during defrost; C-Y = runs with the
compressor, ON during defrost; o-Y = continuous mode, ON during defrost.
Fnd
Fans delay after defrost: (0 to 255min) interval between end of defrost and evaporator
fans start.
FCt
Temperature differential to avoid fan short cycles: (0 to 59°C; 0 to 90°F) (N.B.: if
FCt=0 function disabled) if the difference of temperature between the evaporator and
the room probes is higher than FCt value, the fans will be switched on.
FSt
Fans stop temperature: (-55 to 50°C; -67 to 122°F) setting of temperature, detected
by evaporator probe, above which fans are always OFF.
ALARMS
ALU
MAXIMUM temperature alarm:
If ALC=Ab: [ALL to 150.0°C or ALL to 302°F]
If ALC=rE: [0.0 to 50.0°C or 0 to 90°F]
when this temperature is reached the alarm is enabled, after the ALd delay time.
