Operating Manual
XR03/04CX 03132014_MM XR03CX – XR04CX
7. PARAMETERS
REGULATION
Hy Differential: (0,125°C / 1 ÷ 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÷SET/-67°F÷SET): Sets the minimum value for the set point..
US Maximum SET POINT: (SET÷99°C/ SET÷99°F). Set the maximumvalue for set point.
ot First probe calibration: (-9.9÷9.9°C / -99 ÷ 99°F) allows to adjust possible offset of the first
probe.
P2 Evaporator probe presence: n= not present; y= the defrost stops by temperature.
oE Second probe calibration: (-9.9÷9.9°C / -99 ÷ 99°F) allows to adjust possible offset of the
second probe.
od Outputs activation delay at start up: (0÷99min) 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.
Cy Compressor ON time with faulty probe: (0÷99 min) time during which the compressor is
active in case of faulty thermostat probe. With Cy=0 compressor is always OFF.
Cn Compressor OFF time with faulty probe: (0÷99 min) time during which the compressor is
OFF in case of faulty thermostat probe. With Cn=0 compressor is always active.
DISPLAY
CF 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, oE,
o1, AU, AL have to be checked and modified if necessary).
rE Resolution (only for °C):(dE ÷ in) dE= decimal between -9.9 and 9.9°C; in= integer
Ld Default display: (P1 ÷ P2) P1= thermostat probe; P2= evaporator probe. SP=Set point
dy Display delay: (015 min.) when the temperature increases, the displayis updated of 1 °C/1°F
after this time.
DEFROST
td Defrost type: (EL – in) EL= electrical heater, compressor OFF; in= hot gas, compressor ON;
dE Defrost termination temperature: (-55÷50°C / -67÷99°F) if P2=Y it sets the temperature measured
by the evaporator probe,which causes the end of defrost.
id Interval between defrost cycles: (0÷99 ore) Determines the time interval between the
beginning of two defrost cycles.
nd Maximum length for defrost: (0÷99 min. with 0 no defrost) when P2=n, (not evaporator
probe: timed defrost) it sets the defrost duration, when P2 = y (defrost end based on
temperature) it sets the maximum length for defrost.
dd Start defrost delay: ( 0÷99min) This is useful when different defrost start times are necessary
to avoid overloading the plant.
dF Display during defrost: (rt / it / SP / dE) rt= real temperature; it= start defrost temperature;
SP= SET-POINT; dE= label dE.
dt Drip time: (0÷99 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.
dP Defrost at power –on: (y÷n) y= at power on defrost starts; n= defrost doesn’t start at power-on
ALARM
AU Maximum temperature alarm: (AL÷99°C/99°F) when this temperature is reached the alarm
is enabled, after the “Ad” delay time.
AL Minimum temperature alarm: (-55÷AU°C /-67÷AU°F) when this temperature is reached the
alarm is enabled, after the “Ad” delay time.
Ad Temperature alarm delay: (0÷99 min) time interval between the detection of an alarm
condition and alarm signalling.
dA Exclusion of temperature alarm at startup: (0÷99 min) time interval between the detection of the
temperature alarm condition after instrumentpower on and alarm signalling.
OTHER
d1 Thermostat probe display (read only)
d2 Evaporator probe display (read only)
Pt Parameter code table
8. INSTALLATION AND MOUNTING
Instrument XR03CX and XR04CX 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 060 °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.
9. ELECTRICAL CONNECTIONS
The instrument is provided with screw terminal block to connect cables with a cross section up to 2,5
mm2. 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.
1.1 PROBES
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.
10. HOW TO USE THE HOT KEY
1.2 HOW TO PROGRAM THE HOT KEY FROM THE INSTRUMENT (UPLOAD)
1. Program one controller with the front keypad.
2. When the controller is ON, insert the “Hot key” and push key; the "uP" message appears
followed a by flashing “Ed”
3. Push “SET” key and the “Ed” will stop flashing.
4. Turn OFF the instrument remove the “Hot Key”, then turn it ON again.
NOTE: the “Er” 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.
1.3 HOW TO PROGRAM AN INSTRUMENT USING 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
“do” message is blinking followed a by flashing “Ed”.
4. After 10 seconds the instrument will restart working with the new parameters.
5. Remove the “Hot Key”.
NOTE: the “Er” 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.
11. ALARM SIGNALLING
Mess.
Cause
Outputs
"P1"
Room probe failure
Compressor output according to
“Cy” e “Cn”
"P2"
Evaporator probe failure
Defrost end is timed (Only XR04CX)
"HA"
Maximum temperature alarm
Outputs unchanged
"LA"
Minimum temperature alarm
Outputs unchanged
1.4 ALARM RECOVERY
Probe alarms P1” and “P2” 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” and “LA” automatically stop as soon as the temperature returns
to normal values.
Alarms “EA” and “CA” (with iF=bA) recover as soon as the digital input is disabled.
12. TECHNICAL DATA
Housing: self extinguishing ABS.
Case: frontal 32x74 mm; depth 50mm;
Mounting: panel mounting in a 71x29mm panel cut-out
Protection: IP20; Frontal protection: IP65
Connections: Screw terminal block 2,5 mm2wiring.
Power supply: according to the model 110Vac 10%, 50/60Hz --- 230Vac 10%, 50/60Hz
Power absorption: 3.5 VA max
Display: 2 digits, red LED, 14,2 mm high; Inputs: Up to 2 NTC probes.
Relay outputs: compressor SPST 20(8)A 250Vac or 8(3) A 250Vac
defrost or Aux: SPDT 8(3) 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: -25÷60 °C.
Relative humidity: 2085% (no condensing).
Measuring and regulation range: NTC probe: -40÷110°C.
Resolution: 0,1 °C or 1°C or 1 °F (selectable); Accuracy (ambient temp. 25°C): ±0,1 °C ±1 digit
13. CONNECTIONS
XR03CX
NOTE: In model with 110Vac the power supply has to be connected to 6-7 terminal
XR04CX
NOTE: In model with 110Vac the power supply has to be connected to 6-7 terminals.
