Emerson Dixell XW30LH Installing And Operating Instructions

Digital controller for medium-low temperature
refrigeration applications
XW30LH – XW30LRH
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
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reference.
The instrument shall not be used for purposes different from those described hereunder. It cannot be
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used as a safety device.
• Check the application limits before proceeding.
Dixell Srl reserves the right to change the composition of its products, even without notice, ensuring
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the same and unchanged functionality.
1.2 SAFETY PRECAUTIONS
Check the supply voltage is correct before connecting the instrument.
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Do not expose to water or moisture: use the controller only within the operating limits avoiding sudden
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temperature changes with high atmospheric humidity to prevent formation of condensation
Warning: disconnect all electrical connections before any kind of maintenance.
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Fit the probe where it is not accessible by the End User. The instrument must not be opened.
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In case of failure or faulty operation send the instrument back to the distributor or to "Dixell S.r.l." (see
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address) with a detailed description of the fault.
Consider the maximum current which can be applied to each relay (see Technical Data).
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• 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
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with inductive loads could be useful.
2. GENERAL DESCRIPTION
Models XW30LH and XW30LRH, format 38x185mm, are microprocessor based controllers, suitable
for normal temperature applications on ventilated refrigerating units. They have 3 relay outputs to
control compressor, fan, and light.
They could be provided with a Real Time Clock which allows programming of up to 6 daily defrost
cycles, divided into holidays and workdays. A "Day and Night" function with two different set points is
fitted for energy saving. They are also provided with up to 3 NTC or PTC probe inputs, the first one for
temperature control, the second one, to be located onto the evaporator, to control the defrost
termination temperature and to managed the fan. One of the digital inputs can operate as third
temperature probe. The fourth probe is used to signal the condenser temperature alarm or to display a
temperature. NOTE: the fourth probe is available only for XW30LH models.
The HOT KEY output allows connecting the unit, by means of the external module XJ485-CX, to a
network line ModBUS-RTU compatible such as the dIXEL monitoring units of X-WEB family. It
allows programming the controller by means the HOT KEY programming keyboard.
The instrument is fully configurable through special parameters that can be easily programmed
through the keyboard.
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
Defrost is performed through a simple stop of the compressor.
The defrost interval depends on the presence of the RTC (optional). If the RTC is present is controlled
by means of parameter EdF:
EdF=in: a defrost starts after elapsing the idF time (standard way for controller without RTC).
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EdF=rtC: defrosts are scheduled by using a real time clock system, depending on the hours
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set in the parameters Ld1..Ld6, during workdays, and in Sd1...Sd6 during holidays.
Other parameters are used to control defrost cycles: its maximum length (MdF) and two defrost
modes: timed or controlled by the evaporator's probe (P2P).
3.3 CONTROL OF EVAPORATOR FANS
The fan control mode is selected by means of the FnC parameter:
FnC=C_n: fans will switch ON and OFF with the compressor and not run during defrost;
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FnC=o_n: fans will run even if the compressor is off, and not run during defrost;
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FnC=C_Y: fans will switch ON and OFF with the compressor and run during defrost;
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FnC=o_Y: fans will run continuously also during defrost.
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After defrost, there is a timed fan delay allowing for drip time, set by means of the Fnd parameter.
An additional parameter FSt provides the setting of temperature, detected by the evaporator probe,
above which the fans are always OFF. This is used to make sure circulation of air only if his
temperature is lower than set in FSt.
3.3.1 Forced activation of evaporator fans
This function, managed by the FCt parameter, is designed to avoid short cycles of evaporator fans,
which could happen when the controller is switched on or after a defrost (when the room air warms the
evaporator). If the temperature difference between the evaporator and the room probes is higher than
the value set in the FCt parameter the fans are switched on. With FCt=0 this function is disabled.
1592027560 XW30LH-XW30LRH GB r1.0 18.03.2015
3.3.2 Fans cyclic activation with compressor off.
When FnC=C-n or C-Y (fans working in parallel with the compressor), by means of the Fon and FoF
parameters the fans can carry out on and off cycles even if the compressor is switched off. When the
compressor is stopped the fans go on working for the Fon time. With Fon=0 the fans remain always
off, when the compressor is off.
4. FRONT PANEL COMMANDS
To display target set point; in programming mode it selects a parameter or confirm an
operation.
(DEF) To start a manual defrost.
(UP) To see the max stored temperature; in programming mode it browses the
parameter codes or increases the displayed value.
(DOWN) To see the min stored temperature; in programming mode it browses the
parameter codes or decreases the displayed value.
(OFF) To switch the instrument off, if onF=oFF.
(LiG) To switch the light, if oA3=Lig.
KEY COMBINATIONS:
+
+
+
4.1 USE OF LEDS
Each LED function is described in the following table.
LED MODE FUNCTION
ON Compressor enabled
Flashing Anti-short cycle delay enabled
ON Defrost enabled
Flashing Drip time in progress
ON Fans enabled
Flashing Fans delay after defrost in progress.
ON An alarm is occurring
ON Continuous cycle is running
ON Energy saving enabled
ON Light on
ON Measurement unit
°C/°F
Flashing Programming phase
5. AUTOMATIC KEYBOARD LOCK
To avoid accidental modifications of the controller settings, the XW30LH and XW30LRH keyboard
will be locked automatically if no key will be touched for 60 seconds. The controller will show
"LoC" flashing for few seconds when it's locking. The light key is operating even if the keyboard is
locked.
5.1 TO UNLOCK THE KEYBOARD
1. Touch any key.
2. The keys will be lighted.
3. Keep a key pushed for few seconds till the "on" message is displayed.
6. MAX & MIN TEMPERATURE MEMORIZATION
6.1 HOW TO SEE THE MIN TEMPERATURE
1.
Press and release the DOWN key.
2.
The "Lo" message will be displayed followed by the minimum temperature recorded.
3.
By pressing the DOWN key again or by waiting 5 sec the normal display will be restored.
6.2 HOW TO SEE THE MAX TEMPERATURE
1.
Press and release the UP key.
2.
The "Hi" message will be displayed followed by the maximum recorded temperature.
3.
By pressing the UP key again or by waiting 5 sec the normal display will be restored.
6.3 HOW TO RESET THE MAX AND MIN TEMPERATURE RECORDED
1. Keep SET key pressed more than 3 sec, 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.
7. MAIN FUNCTIONS
7.1 TO SET THE CURRENT TIME AND DAY (ONLY WITH RTC)
When the instrument is switched on, it's necessary to program the time and day.
1. Enter the Pr1 programming menu, by pushing the SET+ DOWN keys for 3 sec.
The rtC parameter is displayed. Push the SET key to enter the real time clock menu.
2.
3. The Hur (hour) parameter is displayed.
4. Push the SET and set current hour by the UP and DOWN keys, then push SET to
confirm the value.
5. Repeat the same operations with Min (minutes) and dAy (day) parameters.
To exit: Push both SET+UP keys or wait for 15 sec without pushing any keys.
XW30LH – XW30LRH
To lock & unlock the keyboard.
To enter in programming mode.
To return to the room temperature display.
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