Technical data

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Contents
1. Application
2. Technical data
3. Wall mounting
4. Safety notices
5. Electrical connection
6. Commencing operation and control
behaviour
7. Supplementary functions
8. BUS system
9. Technical information
10. Handling Instructions
11. Scope of supply and guarantee
12. Display screen and system analysis
13. Comfort control programming
1. Application
Enclosure cooling units are designed and built
to dissipate heat from enclosures by cooling
the air inside the enclosure and protecting
temperature-sensitive components. Enclosure
cooling units are particularly suitable for a
temperature range of +40°C to +55°C.
2. Technical data
(see table 2.1)
3. Wall mounting
According to production model, the wall-
mounted unit can be mounted, installed, or
partially installed, to choice (up to SK 3302.xxx
and SK 3332.xxx). Cut out the sections and drill
according to Fig. 3.1 at the fitting level.
3.1 Mounting
Cut the enclosed seals to the required length and
attach to the unit in accordance with Fig. 3.2.
Screw tapped pins into the blind nuts on the rear
of the unit. The unit is then to be secured using
washers and nuts.
3.2 Installation
First of all, the lamellar grid and belt are to be
removed. The plug is to be removed from the
display screen on the inner side of the belt.
Cut the enclosed seals to the required length
and attach to the unit in accordance with Fig. 3.2.
Loosen the nuts and washers, then fasten the unit
to the enclosure with the washers and nuts.
3.3 Partial installation
For partial installation the unit cover is to be
separated from the chassis. First of all, remove
the lamellar grid and belt. Carefully disconnect
the plug from the display screen. Loosen the
4 nuts and washers of the cover. Pull the cover
a little bit to the front. Disconnect the safety
connection between cover and chassis and
separate the plug-in connection for the fan.
Remove the unit cover completely. Loosen the
4 spacer bolts from the chassis. Attach the
enclosed seal all-round along the edge of the
chassis (see Fig. 3.2). Slide the chassis into
the mounting cut-out and screw-fasten with
4 spacer bolts. It is now fitted to the enclosure
in reverse sequence.
4. Safety notices
The following safety notices are to be observed
in their entirety for the correct use of the
equipment:
 To prevent the enclosure with the cooling unit
fitted tipping over, it is essential that this be
bolted to the floor.
 A roller door is to be used to ensure problem-
free opening and closing of the enclosure
door.
 A transportable enclosure with built-in cooling
unit may only be produced if an additional
transport anchorage to support the cooling
unit is used.
Prior to mounting, ensure that:
 the site for the enclosure, and hence the
arrangement of the cooling unit, is selected
so as to ensure good ventilation;
 the location is free from excessive dirt and
moisture;
 the cutout for air extraction is located
in the upper area of the enclosure;
 the mains connection ratings, as stated
on the rating plate, are available;
 the ambient temperature does not exceed
+55°C;
 the packaging shows no signs of damage.
Traces of oil on damaged packaging are an
indication of refrigerant loss and of leakage in
the unit system. Any damage to the packaging
may be the cause of subsequent malfunctions;
 the enclosure is sealed on all sides (IP 54).
Condensation will occur if the enclosure is leaky;
 the separation of the units from one another
and from the wall should not be less than
200 mm;
 air inlet and outlet are not obstructed on the
inside of the enclosure;
 units are only fitted horizontally in the specified
position.
Max. deviation from the true horizontal: 2°;
 condensate drainage is provided (see 9.3);
 electrical connection and repair are carried out
only by authorised personnel.
 Use only original replacement parts and
accessories.
 to avoid an increase in condensation, a door-
operated switch (e.g. PS 4127.000) should be
used which will switch the cooling unit off when
the enclosure door is opened (see 7.3);
 losses from the components installed in
the enclosure must not exceed the specific
refrigeration capacity of the cooling unit itself;
 the customer must not modify the cooling unit
in any way.
5. Electrical connection
The connected voltage and frequency must corre-
spond to the values stated on the rating plate.
During commissioning, the data on the rating
plate of the device shall apply. The cooling unit
must be connected to the mains via an all-pin iso-
lating device which ensures at least 3 mm contact
opening when switched off. The unit must not
have any additional temperature control connec-
ted up-stream at the supply end. The fans and
compressors built into single and three-phase
devices are intrinsically safe (thermal winding
protection).
This also applies to SK 3304.110 / .510,
SK 3305.110 / .510, SK 3328.110 / .510,
SK 3329.110 / .510 transformer types, and to
specially rated units which are also fitted with a
transformer.
Line protection should be provided by means of
the pre-fuse specified on the rating plate. Only
one automatic cutout should be connected bet-
ween the cooling unit and the power supply. A
time-lag backup-fuse as specified on the rating
plate (safety cutout K-characteristic or time-lag
lead fuse) is mandatory.
The three phase supplies for the SK 3304.... /
SK 3305.... / SK 3328.... / SK 3329.... /
SK 3332.... must be connected via a motor safety
switch to a TN grid with grounded star point.
Summation current as specified on the rating
plate. Specially rated three-phase units must be
protected by means of transformer safety
switches (category AC-6A) specified on the rating
plate.
For units designed for three phase 400/460 V,
the rotary field or the absence of a phase is also
monitored. If the rotary field is incorrect or a phase
is absent, the unit will not run.
The cooling unit does not have its own surge
protection. Surge protection must be provided
by the operator in the power supply wiring,
including both lightning and power surge
protection. The power supply voltage must
not deviate from the tolerances by any more
than +/–10 %.
In accordance with IEC 61 000-3-11, the unit is
intended solely for use at sites with a continuous
current-carrying capacity (incoming mains power
supply) > 100 A per phase and with a supply
voltage of 400/230 V. If necessary, the power
supply company must be consulted to ensure that
the continuous current-carrying capacity at the
point of connection to the public grid is sufficient
for connection of the unit. The chosen mains
connection form must guarantee low-noise
equipotential bonding.
Observe the relevant regulations during
installation!
English
6. Commencing operation
and control behaviour
Following the completion of mounting and a
waiting period of approximately 30 minutes
(to allow oil to collect in the compressor in order
to ensure lubrication and cooling).
6.1 Basic control system
Version .....100 / .110 / .140
The cooling unit operates automatically, i.e. after
electrical connection, the evaporator fan will run
continuously to circulate the air inside the
enclosure. The installed basic controller (setting
the desired internal temperature; factory setting
+35°C) provides automatic control switch-off of
the cooling unit by the set value of the fixed
switching difference of 5 K.
6.1.1 Temperature setting at the basic
controller
First of all, the lamellar grid and belt with the
incorporated display is to be removed from the
unit. The display lock is then to be slackened and
this is to be pushed forward off the lamellar grid/
belt. Finally, the display screen (1) is carefully
removed, e.g. with a screwdriver. The desired
nominal temperature can be set on the
potentiometer (2) which is now accessible. After
the temperature has been set, the display of all
screens in the lamellar grid is to be locked once
more. The lamellar grid and belt are to be
fastened to the unit again.
Fig. 6.1 Basic controller
6.1.2 Operation of the basic controller
The basic controller monitors and controls the
cooling unit. After the supply voltage has been
connected, the green LED (3) lights to indicate
readiness for operation. The green LED is
connected in series with a door limit switch, and
flashes if the enclosure door is opened. The red
LED (4) signals too high a temperature inside the
enclosure; at 5 K above the set value, the red LED
comes on permanently. In addition, the excess
temperature message can still be queried via an
integrated potential-free contact in the cooling
unit connection terminal.
K1 fault signal relay with changeover contact
Ter minal 3: NC (normally closed)
Ter minal 4: C (connection between voltage
supply and fault signal relay)
Ter minal 5: NO (normally open)
The definitions NC and NO refer to the de-
energised state. As soon as voltage is applied to
the cooling unit, the fault signal relay picks up.
As a result, the relay contacts change their state
(contact 3 – 4 open; contact 4 – 5 closed),
representing the normal operating status of the
cooling unit. As soon as a system message
occurs or the voltage supply is interrupted, the
relay drops out. (see also circuit diagrams on
page 39).
The high pressure alarm in the cooling circuit is
indicated by the red LED flashing. In this case,
the unit is to be reset manually, by pressing the
rubberized potentiometer display (5) for
3 seconds (see 6.1.1).
If the red LED flashes on the SK 3302.xxx, check
the plug connector on the board and replace if
necessary.
Test mode
By holding down the potentiometer for 5 seconds,
the cooling unit will commence cooling operation,
irrespective of the setpoint.
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03_S_3302_xxx_12_15_eng.fm Seite 10 Donnerstag, 8. Dezember 2005 12:15 12