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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 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.
2. GENERAL DESCRIPTION
Model XW20LS is microprocessor based controller suitable for
applications on refrigerating units. It is provided with 2 relay outputs.
Model XW30LS is microprocessor based controller suitable for
applications on refrigerating units. It is provided with 3 relay outputs.
3. CONTROLLING LOADS
3.1 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 DEFROST
Two defrost modes are available through the "tdF" parameter: defrost
through electrical heater (tdF = EL) and hot gas defrost (tdF = in).
Other parameters are used to control the interval between defrost
cycles (IdF), its maximum length (MdF).
At the end of defrost dripping time is started, its length is set in the Fdt
parameter. With Fdt =0 the dripping time is disabled.
3.3 CONTROL OF EVAPORATOR FANS
The fan control mode is selected by means of the "FnC" parameter.
An additional parameter "FSt" provides the setting of temperature,
detected by the evaporator probe, above which the fans are always
OFF.
3.3.1 Forced activation of fans
Functioning: if the difference of temperature between the evaporator
and the room probes is more than the value of the Fct parameter, the
fans are switched on. With Fct=0 the function is disabled.
4. MAX & MIN TEMPERATURE MEMORIZATION
4.1 HOW TO SEE THE MIN TEMPERATURE
1.
Press and release the
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2.
The "Lo" message will be displayed followed by the minimum
temperature recorded.
1598018305 XW20LS-XW30LS IRD IT-GB-FR-TD-ES r1.0 10.01.2008
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Manual GB
3.
By pressing the
display will be restored.
4.2 HOW TO SEE THE MAX TEMPERATURE
1.
Press and release the
2.
The "Hi" message will be displayed followed by the maximum
temperature recorded.
3.
By pressing the
display will be restored.
4.3 HOW TO RESET THE MAX AND MIN TEMPERATURE
RECORDED
1.
Hold press the SET key for more than 3s, while the max. or min
temperature is displayed. (rSt message will be displayed)
2.
To confirm the operation the "rSt" message starts blinking and
the normal temperature will be displayed.
5. MAIN FUNCTIONS
5.1 HOW TO SEE THE SETPOINT
1.
Push and immediately release the SET key: the display will
show the Set point value;
Push and immediately release the SET key or wait for 5
2.
seconds to display the probe value again.
5.2 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
To memorise the new set point value push the SET key again or
4.
wait 10s.
5.3 HOW TO START A MANUAL DEFROST
Push the DEF key for more than 2 seconds and a manual defrost will
start.
5.4 HOW TO CHANGE A PARAMETER VALUE
To change the parameter's value operate as follows:
Enter the Programming mode by pressing the SET + n
1.
for 3s (the "°C" or "°F" LED starts blinking).
2.
Select the required parameter. Press the SET key to display its
value.
3.
Use "UP" or "DOWN" to change its value.
4.
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 set value is stored even when the procedure is exited by
waiting the time-out to expire.
5.5 THE HIDDEN MENU
The hidden menu Includes all the parameters of the instrument.
5.5.1 HOW TO ENTER THE HIDDEN MENU
1.
Enter the Programming mode by pressing the SET +
for 3s (the "°C" or "°F" LED starts blinking).
2.
Released the keys, then push again the SET+
than 7s. The Pr2 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
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5.
Use
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or
6.
Press SET to store the new value and move to the following
parameter.
To exit: Press SET +
XW20LS - XW30LS
n
n
n n
key again or by waiting 5s the normal
o
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key.
o
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key again or by waiting 5s the normal
o o
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or
n
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n
n
n
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to change its value.
o
o
o o
or wait 15s without pressing a key.
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