1592009221 XW20L-V GB r1.0 30.05.2011 XW20L – XW20V 1/4
WING
XW20L – XW20V
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.
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
Model XW20L, 38x185 mm format, and model XW20V, 100x64 format, are microprocessor based
controllers suitable for applications on medium or normal temperature refrigerating units. They are
provided with 2 relay outputs to control compressor and the lights.
They are also provided with 1 NTC or PTC probe inputs for temperature control. There are 1 digital
inputs (free contact) configurable by parameter.
An output allows the user to programme the parameter list with the “Hot Key”.
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 o key 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, o for about
3 seconds.
3.3 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).
Defrost is performed through a simple stop of the compressor. Parameter “IdF” controls the interval
between defrost cycles, while its length is controlled by parameter “MdF”.
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 light of the cold-room
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
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”
ON The light is on
4.2 HOW TO SEE THE MIN TEMPERATURE
1. Press and release the n key.
2. The “Lo” message will be displayed followed by the minimum temperature recorded.
3. By pressing the n key or waiting for 5s the normal display will be restored.
4.3 HOW TO SEE THE MAX TEMPERATURE
1. Press and release the o key.
2. The “Hi” message will be displayed followed by the maximum temperature recorded.
3. By pressing the o key 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 n 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
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