DKC Via Larga 15 Bedienungsanleitung
COOLERS FOR ELECTRICAL ENCLOSURES
OPERATION AND MAINTENANCE MANUAL
WALL MOUNT VERSION
CLIMATIZZATORI PER QUADRI ELETTRICI
MANUALE D’USO E MANUTENZIONE
VERSIONE DA PARETE
CLIMATIZADORES PARA CUADROS ELECTRICOS
MANUAL DE USO Y MANUTENCIÓN
VERSIÓN DE PARED
2
Table of contents
CAUTION ............................................................................................................................................................ 3
GENERAL SAFETY INSTRUCTIONS ...................................................................................................................... 3
OPERATING PRINCIPLE ...................................................................................................................................... 3
ACCEPTANCE AND STORAGE ............................................................................................................................. 4
HANDLING ......................................................................................................................................................... 4
INSTALLATION.................................................................................................................................................... 4
MECHANICAL MOUNTING ......................................................................................................................... 4
MOISTURE DRAIN ...................................................................................................................................... 5
ELECTRICAL CONNECTIONS ....................................................................................................................... 5
CONTROL, MONITORING AND SAFETY COMPONENTS ..................................................................................... 5
HP SAFETY PRESSURE SWITCH ................................................................................................................... 5
MECHANICAL REGULATION THERMOSTAT (EASY VERSION) ..................................................................... 6
ELECTRONIC REGULATION THERMOSTAT (BASE/ TOP VERSION) ............................................................. 6
PARAMETER SETTING .........................................................................................................................
STATUS ICONS ....................................................................................................................................
USE OF BUTTON COMBINATIONS AND THEIR FUNCTIONS ............................................................... 8
FIRST LEVEL VARIABLES ...................................................................................................................... 8
DIAGNOSTIC CODE TABLE .................................................................................................................. 9
START-UP ......................................................................................................................................................... 10
INITIAL TESTS AFTER START-UP ............................................................................................................... 10
MAINTENANCE ................................................................................................................................................ 11
PRODUCT DISPOSAL ........................................................................................................................................ 11
TROUBLE SHOOTING ....................................................................................................................................... 12
WARRANTY ...................................................................................................................................................... 13
MANUFACTURER NAME AND ADDRESS .......................................................................................................... 14
3
CAUTION
It is important to store the present manual in a clean and dry place. It refers to activities requiring
professionally qualified staff.
Do not try to alter the product or modify its characteristics. Do not use unqualified personnel for repair
activities, it may lead to failures, damages or safety risks.
A non-observance of the instructions and restrictions given in the present manual shall waive any our
responsibility for correct functioning and warranty of the product.
GENERAL SAFETY INSTRUCTIONS
The coolers must be used only for their intended purpose; only approved coolants must be applied.
Any attempt to activate the product with no coolant gas is strictly forbidden.
Never start the cooler before all external panels have been closed in order to avoid the risk of
electrocution or contact with moving parts.
In case it is necessary to evacuate the coolant from the system, do not disperse it in the environment,
but collect it by means of special exchange units.
OPERATING PRINCIPLE
The cooler is purposed to
cool electrical enclosures. It
may be externally mounted
to an enclosure wall. It allows
air cooling and dehumidifying
inside the enclosure and
avoiding failures of electrical
and electronic components
installed therein. The cooler
is provided with an
adjustable intervention
thermostat. The cooling
circuit starts to function only
after the pre-set temperature
has been reached.
The principal components
constituting the circuit are:
evaporator, condenser,
compressor and expansion
device.
The compressor compresses
the cooling fluid (R134a) at
high pressure and
temperature.
At the output of the compressor the cooling fluid in the state of overheated vapour is transferred to the
external exchange unit (condenser), where releases the heat to the external environment and condenses
completely.
4
At the inlet of the evaporator the expansion device is located (capillary or thermostatic valve), purposed to
reduce the cooling fluid pressure to a value, which allows its evaporation in the cold exchanger.
The coolant passing through the evaporator changes its state taking the heat away from the source (air
inside the enclosure to be conditioned) by means of the low temperature.
The evaporator is then connected to the compressor, so the fluid in the state of overheated vapour is
drawn by the compressor to be reintroduced into the circuit.
ACCEPTANCE AND STORAGE
Upon delivery of the products it is necessary to make sure they had been transported in the position
indicated by the symbols printed onto the package.
It is necessary to ensure the packing materials are undamaged and most importantly do not show oil spots,
which denote a leakage of cooling fluid.
The cooler is designed so that the compressor remains always in upright position. It may never be laid
down; if this happens, it is necessary to put it in upright position and then wait for 8 hours before setting it
in operation.
Do not set the unit in operation if a coolant leakage is found.
Installation, maintenance and repair activities must be carried out only by qualified personnel. Only filter
substitutions may be performed by a non-specialized staff.
During the operations of handling and storage wall mount coolers are to be kept in vertical
position, while roof mount ones in horizontal position, at the temperature in the range
between -10°C and + 0°C.
HANDLING
Having removed the packing materials, coolers are to be handled using the dedicated fixing
points located in the upper part. Use the supplied eyebolts paying attention to balance the
cooler and to avoid any impact.
INSTALLATION
Having removed the packing materials, make sure that there are no leakages of oil or gas and
that no parts or documents are left in the package. The supply voltage indicated on the device
name plate is to be in conformity with the requested one.
MECHANICAL MOUNTING
The coolers may be mounted inside or outside the enclosure. The cooler must always be
installed in upright position (with the compressor in the bottom) with the maximum standoff
from the upright position equal to 2°.
Before mounting it is necessary to ensure the enclosure minimum protection degree is IP54
in order avoid problems caused by external air condensing.
In case of a cooler mounting onto a door, it is necessary to verify if the hinges are capable to
sustain the device weight.
In any case the cooler is to be mounted as high as possible in order to draw out the hottest
air from the enclosure. To perform the installation it is necessary to cut the sheet steel with
5
the help of a template supplied or request its drawing at our Technical Department. The cooler is provided
with a polyurethane seal applied by continuous molding and does not require further seals reducing
significantly the installation time.
If the device is not installed correctly, the IP 54 protection degree will be lost.
MOISTURE DRAIN
BASE and TOP versions are provided with a condensate evaporator located inside the cooler. In case of
extreme environmental conditions the evaporator may be insufficient. Therefore a “too full” drain is
provided, to channel the excess liquid outside the system.
EASY version is provided with an external moisture drain.
In any case there is a joint located below the cooler base on the right side, which must be connected to a
moisture collection pipe.
ELECTRICAL CONNECTIONS
The installation is to be performed in accordance to the standards in force in the country of operation. The
supply circuit of the cooler is to be protected by a multipole magnetothermic differential switch.
Make sure the supply voltage indicated on the device name plate is in conformity with the requested one.
The cooler is provided with one or two electrical connectors located on its rear side.
A black coloured connector, which is always provided, is purposed for the cooler power connection. In case
of single-phase coolers it is necessary to connect the three clamps marked N L1 PE.
Some models (TOP version) are provided with another connector, of grey colour, purposed for signal
connection. Depending on the model they can be:
free alarm contact: the contact is closed in case the temperature inside the electrical enclosure
remains beyond a pre-set limit for a certain time;
digital input of remote ON/OFF, door opening limit switch.
In any case it is necessary to refer to the electrical circuit diagram attached to the present manual.
CONTROL, MONITORING AND SAFETY COMPONENTS
The cooler is provided with control and monitoring components assuring its correct functioning. An
intervention of these automatisms indicates a failure of the device. It is forbidden to make an electrical
bypass of the existing components. Besides being dangerous this manipulation waives the product
warrantee.
HP SAFETY PRESSURE SWITCH
The function of this component is to stop the compressor operation when the internal pressure of the
supply circuit exceeds the calibration level (24bar).
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MECHANICAL REGULATION THERMOSTAT (EASY VERSION)
The thermostat bulb is located at the inlet of the air drawn-in from the
enclosure and monitors the temperature, sanctioning the compressor and
condenser fan activation.
Manual regulation of the thermostat is to be performed by qualified personnel,
by turning its regulation pin after having cut the power and removed the
protection housing.
Turn the pin counter-clockwise in order to increase the setpoint.
Turn the pin clockwise in order to reduce the setpoint.
Too low temperature inside the enclosure may cause serious problems to the
components and lead to excessive energy consumption.
It is recommended to set a temperature not lower than 30°C and not higher
than 40°C. It is reminded that the thermostat has a differential of
approximately 4 °C and hence the compressor shall start functioning at a
temperature exceeding the deactivation temperature approximately by 4°C.
The manufacturer default setting is 35°C.
ELECTRONIC REGULATION THERMOSTAT (BASE/ TOP VERSION)
It indicates the internal enclosure temperature while in operation.
The setpoint is pre-set by the manufacturer to the value of 34°C with a differential of 2°C.
The cooler is activated at the default temperature (34°C) and deactivated at the default temperature plus
the differential (36°C).
The thermostat is provided with a minimum time delay between the deactivation and the next activation of
the compressor equal to three minutes.
Thermostat
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PARAMETER SETTING
BUTTON
FUNCTION
UP BUTTON
Increases values / Scrolls the parameters up
Mutes the alarm, if any
DOWN
BUTTON
Decreases values / Scrolls the parameters down.
Stand
-
by
If kept down for more than 1 sec,
alternates the Stand
-
by state to the normal
functioning state and vice versa. A BEEP is produced to confirm the state
alteration. In Stand-by the system is not functioning and OFF sign alternates the
temperature value on the display.
Set
Displays the
setpoint
Allows to set the setpoint if pressed simultaneously with UP or DOWN button.
STATUS ICONS
ICON
MEANING
REFRIG
E
RATION CO AND ICON
LED OFF = Refrigeration OFF
LED ON = Refrigeration ON
Flashing LED = Refrigeration ON holding up the delay time (3 minutes after the previous stop)
ALAR
ICON
LED OFF = No alarm
LED ON = Indicates, that a temperature alarm has been given and then withdrawn (HACCP alarm).
Flashing LED = Active alarm
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USE OF BUTTON COMBINATIONS AND THEIR FUNCTIONS
FUNCTION / BUTTON COMBINATION
SET CONFIGURATION
/
/ /
/
(Set +
(Set + (Set +
(Set + t
tt
to
oo
ou
uu
u)
))
)
Press the "Set" button to view the current SETPOINT value (temperature).
Keeping the "Set" button down and pressing one of the two buttons (t) or (u) the SETPOINT value is modified.
To return to the temperature viewing the "Set" is to be released, modified settings shall be automatically saved.
1st LEVEL PROGRA ING
/
/ /
/
(
((
(t
tt
t+
++
+u
uu
u)
))
)
Press and hold simultaneously “UP” and “DOWN” buttons for more than 3 sec in order to access the first level
programming menu. Having accessed the menu a confirmation BEEP is generated. After 30 sec the menu is exited
automatically.
FIRST LEVEL VARIABLES
VARIABLE
EANING
DEF.
r0
Temperature differential
referred
to the main
SET
POINT
< Range: 0,2 ÷ 10°C >
It is expressed by an absolute value and defines the hysteresis of the temperature to the
SETPOINT.
2
A1
inimum temperature alarm
< Range: - 45 ÷ -20 °C >
The absolute temperature referred to the environment probe, below which the LOW
temperature alarm is activated upon the delay time (6 minutes) expiration, consisting in an
alternation of EL symbol and the temperature on the display and the alarm icon flashing.
After the alarm has ended, the alarm icon remains on, in order to signal its intervention,
until the UP button is pressed.
0
A2
aximum temperature alarm
< Range: 3 ÷ 10 °C >
If the temperature exceeds the value equal to (setpoint+r0+A2), upon the delay time (6
minutes) expiration, the HIGH temperature alarm is activated, consisting in an alternation
of EH symbol with the temperature on the display and the alarm icon flashing.
After the alarm has ended, the alarm icon remains on, in order to signal the alarm
intervention, until the UP button is pressed.
10
9
DIAGNOSTIC CODE TABLE
Var
EANING
E0
X
Environmental probe functional failure
E2
X
EEPROM
memory error
.
All outputs are deactivated, except the alarm ones, if
any.
EH
X
Maximum temperature alarm
.
Flashing EH symbol alternated with the temperature
(See A2 parameter)
EL
X
Minimum temperature alarm.
Flashing EL symbol alternated with the temperature
(See A1 parameter)
orH
Temperature out of the upper range
(> +99.0°C)
orL
Temperature out of the lower range
(<
-
45.0°C)
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START-UP
Having performed the installation, it is recommended to wait for at least 30 minutes before starting the
system up, in order to allow the lubricant oil collection in the compressor.
Normally upon the system start-up only the evaporator fan is activated, purposed for the air recycling
inside the enclosure. The compressor and the external air fan are not activated, if the internal enclosure
temperature is lower than the one set on the thermostat. In order to test the system, it is necessary to
increase the enclosure internal temperature or decrease the set temperature (35°C set as a default by the
manufacturer).
At these conditions the compressor and the condenser fan are activated. The internal circulation fan must
be always functioning, while the external fan is activated and deactivated simultaneously with the
compressor.
Having tested the correct functioning of the system, it is necessary to set the internal temperature
thermostat to the required value (recommended value 35°C)
INITIAL TESTS AFTER START-UP
Make sure that the air coming from the condenser fan is not drawn back into the enclosure. Observe the
minimum distances specified at the figure below.
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