13. | Technical data______________________________________________________________________ 2 |
14. | Connections _______________________________________________________________________ 3 |
15. | Default setting values ________________________________________________________________ 3 |
2. GENERAL WARNINGS
PLEASE READ BEFORE USING THIS MANUAL
1.This manual is part of the product and should be kept near the instrument for easy and quick reference.
2.The instrument shall not be used for purposes different from those described hereunder. It cannot be used as a safety device.
3.Check the application limits before proceeding.
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.p.A.” (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.
3. GENERAL DESCRIPTION
The XR03CX, in 32⋅74x50mm short format, is microprocessor based controller suitable for applications on normal temperature refrigerating units. It provides two relay output: one for compressor and the other one for alarm signalling or as auxiliary output. It provides an NTC probe input and a digital input for alarm signalling, for switching the auxiliary output or for start defrost. The instrument is fully configurable through special parameters that can be easily programmed through the keyboard or the by HOTKEY.
The XR04CX, in 32⋅74x50mm short format, is microprocessor based controller suitable for applications on normal or low temperature refrigerating units. It provides two relay output: one for compressor and the other one for defrost. It provides two NTC probe inputs, one for room temperature and other one to control defrost termination. The instrument is fully configurable through special parameters that can be easily programmed through the keyboard or the by HOTKEY.
4. REGULATION
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 “Cy” and “Cn”.
5. DEFROST
XR03CX
Defrost is performed through a simple stop of the compressor. Parameter “id” controls the interval between defrost cycles, while its length is controlled by parameter “Md”.
XR04CX
Two defrost modes are available through the “td” parameter:
•td=EL → defrost through electrical heater (compressor OFF)
•td=in → hot gas defrost (compressor ON).
Other parameters are used to control the interval between defrost cycles (id) ), its maximum length (Md) and two defrost modes: timed or controlled by the evaporator’s probe. At the end of defrost dripping time is started, its length is set in the dt parameter. With dt=0 the dripping time is disabled.
+ | To lock or unlock the keyboard |
+ | To enter in programming mode |
+ | To return to room temperature display |
LED | MODO | SIGNIFICATO |
| On | Compressore enabled |
| Flashing | Anti short cycle delay enabled (AC parameter) |
| On | Defrost in progress |
| Flashing | Dripping in progress |
| On | Measurement unit |
| Flashing | Programming mode |
| On | Measurement unit |
| Flashing | Programming mode |
HOW TO SEE THE SET POINT
1.Push and immediately release the SET key, the set point will be showed;
2.Push and immediately release the SET key or wait about 5s to return to normal visualisation.
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 o or n arrows within 10s.
4.To memorise the new set point value push the SET key again or wait 10s.
HOW TO START A MANUAL DEFROST
Push the DEF 
key for more than 2 seconds and a manual defrost will start
HOW TO CHANGE A PARAMETER VALUE
To change the parameter’s value operate as follows:
1.Enter the Programming mode by pressing the SET+ 
keys for 3s (“°C” or “°F” LED starts blinking).
2.Select the required parameter. Press the “SET” key to display its value
3.Use 
or 
to change its value.
4.Press “SET” to store the new value and move to the following parameter.
To exit: Press SET+ 
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.
HIDDEN MENU
The hidden menu includes all the parameters of the instrument.
HOW TO ENTER THE HIDDEN MENU
1.Enter the Programming mode by pressing the SET+ 
keys for 3s (“°C” or “°F” LED starts blinking).
2.Released the keys, then push again the SET+ 
keys for more than 7s. The L2 label will 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 
or 
to change its value.
6.Press “SET” to store the new value and move to the following parameter.
To exit: Press SET+ 
or wait 15s without pressing a key.
NOTE1: if none parameter is present in L1, after 3s the “nP” message is displayed. Keep the keys pushed till the L2 message is displayed.
NOTE2: the set value is stored even when the procedure is exited by waiting the time-out to expire.
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+ 
. In HIDDEN MENU when a parameter is present in First Level the decimal point is on.
TO LOCK THE KEYBOARD
•Keep pressed for more than 3s the 
and 
keys.
•The “OF” message will be displayed and the keyboard will be locked. If a key is pressed more than 3s the “OF” message will be displayed.
TO UNLOCK THE KEYBOARD
Keep pressed together for more than 3s the 
and 
keys till the “on” message will be displayed.
7. PARAMETERS
REGULATION
AUX