Rittal SK 3185830 User manual

Enclosure cooling unit
Assembly and operating instructions
SK 3185830
SK 3186930
SK 3187930
SK 3188940
SK 3189940
SK 3185835
SK 3186935
SK 3187935
SK 3188945
SK 3189945
SK 3185530
SK 3186630
SK 3187630
SK 3188640
SK 3189640

Preface
EN
2Rittal enclosure cooling unit
Preface
Dear Customer!
Thank you for choosing a "Blue e+" enclosure cooling
unit (referred to hereafter as "cooling unit") from Rittal.
Yours
Rittal GmbH & Co. KG
Rittal GmbH & Co. KG
Auf dem Stützelberg
35745 Herborn
Germany
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
www.rittal.com
www.rittal.de
We are always happy to answer any technical questions
regarding our entire range of products.
EN

Rittal enclosure cooling unit 3
Contents
EN
Contents
1 Notes on documentation .................. 4
1.1 CE labelling................................................... 4
1.2 Storing the documents.................................. 4
1.3 Symbols used in these operating
instructions ................................................... 4
1.4 Other applicable documents ......................... 4
2 Safety instructions ............................ 5
2.1 General safety instructions ............................ 5
2.2 Operating and technical staff......................... 5
2.3 Other dangers when using the cooling unit ... 5
2.4 IT safety instructions ..................................... 5
2.4.1 Measures for products and systems ..................... 5
3 Product description .......................... 7
3.1 Functional description and components........ 7
3.1.1 Function ............................................................... 7
3.1.2 Description "chemical version" .............................. 7
3.1.3 Components ........................................................ 8
3.1.4 Control ................................................................. 8
3.1.5 Safety devices ...................................................... 8
3.1.6 Condensation ....................................................... 8
3.1.7 Filter mats ............................................................ 9
3.1.8 Door limit switch ................................................... 9
3.2 Intended use, foreseeable misuse ................. 9
3.3 Scope of supply.......................................... 10
4 Transport and handling .................. 11
4.1 Delivery....................................................... 11
4.2 Unpacking .................................................. 11
4.3 Transport .................................................... 11
5 Installation ...................................... 12
5.1 Safety instructions....................................... 12
5.2 Siting location requirements ........................ 12
5.3 Assembly procedure ................................... 12
5.3.1 Assembly instructions ......................................... 12
5.3.2 Mounting options ............................................... 13
5.3.3 Make a mounting cut-out in the enclosure .......... 14
5.3.4 External mounting of the cooling unit .................. 15
5.3.5 Mounting the cooling unit externally on a
500 mm deep enclosure ..................................... 16
5.3.6 Partial internal mounting of the cooling unit ......... 17
5.3.7 Full internal mounting of the cooling unit ............. 18
5.3.8 Connect the condensate water discharge .......... 18
5.4 Electrical connection ................................... 19
5.4.1 Notes on electrical installation ............................. 19
5.4.2 Install the power supply ...................................... 21
5.4.3 Connect the alarm relays .................................... 22
5.4.4 Interfaces ........................................................... 22
6 Commissioning .............................. 23
7 Operation ....................................... 24
7.1 General....................................................... 24
7.2 Updater program ........................................ 24
7.3 Layout of the display ................................... 24
7.3.1 Start screen ........................................................ 24
7.3.2 Changing a parameter value ............................... 25
7.4 Information menu ....................................... 25
7.4.1 Temperature information .................................... 25
7.4.2 Device information .............................................. 25
7.4.3 Efficiency information .......................................... 26
7.5 Configuration menu.................................... 26
7.5.1 Temperature ....................................................... 26
7.5.2 Network ............................................................. 28
7.5.3 Alarm relays ....................................................... 29
7.5.4 Filter mats .......................................................... 29
7.5.5 Language settings .............................................. 30
7.5.6 Self-test .............................................................. 30
7.6 System messages...................................... 30
7.6.1 Occurrence of a malfunction ............................... 31
7.6.2 Display in case of errors ..................................... 31
7.7 List of system messages............................ 32
8 Inspection and maintenance ........... 35
8.1 Safety instructions for maintenance work ... 35
8.2 Notes on the refrigerant circuit ................... 35
8.3 Maintenance work on the cooling unit ........ 35
8.4 Compressed air cleaning............................ 35
8.4.1 Dismantling a unit with full internal mounting ....... 35
8.4.2 Dismantling the unit ............................................ 35
8.4.3 Cleaning the components with compressed air .. 38
8.4.4 Re-assembling the cooling unit ........................... 38
9 Storage and disposal ...................... 39
10 Technical specifications .................. 40
11 List of spare parts ........................... 43
12 Drawings ........................................ 44
12.1 Representation of mounting cut-outs ......... 44
12.2 Dimensions and installation depths ............ 46
13 Accessories .................................... 49
14 Customer service addresses .......... 50
15 Compact service information .......... 54

1 Notes on documentation
EN
4Rittal enclosure cooling unit
1 Notes on documentation
1.1 CE labelling
Rittal GmbH & Co. KG confirms the conformity of the
cooling unit with the European Union's Machinery Direc-
tive 2006/42/EC and EMC Directive 2014/30/EU. A sim-
plified declaration of conformity can be found in the as-
sembly and installation instructions enclosed with the
device (see also the Rittal website). These are the origi-
nal operating instructions.
1.2 Storing the documents
The assembly and operating instructions as well as all
other applicable documents are an integral part of the
product. They must be issued to everyone who works
with the unit and must always be available and on hand
for operating and maintenance personnel.
1.3 Symbols used in these operating in-
structions
The following symbols are used in this documentation:
This symbol indicates an "action point" and shows that
you should perform an operation or procedure.
1.4 Other applicable documents
Assembly and operating instructions exist as paper doc-
uments and/or digital data carriers for the unit types de-
scribed here and are enclosed with the equipment.
We cannot accept any liability for damage associated
with failure to observe these instructions. Where applica-
ble, the instructions for any accessories used also apply.
Danger!
A dangerous situation in which failure to
comply with the instructions will result in
death or severe injury.
Warning!
A dangerous situation which may cause
death or serious injury if the instructions
are not followed.
Caution!
A dangerous situation which may lead to
(minor) injuries if the instructions are not
followed.
Note:
Important notices and indication of situations
which may result in material damage.

Rittal enclosure cooling unit 5
2 Safety instructions
EN
2 Safety instructions
2.1 General safety instructions
Please observe the following general safety instructions
for the installation and operation of the system:
– Please be sure to observe the applicable regulations
governing electrical installations of the country in
which the cooling unit is installed and operated as well
as national regulations for accident prevention. Please
also observe any internal company regulations, such
as work, operating and safety regulations.
– Use only original Rittal products or products recom-
mended by Rittal in conjunction with the cooling unit.
– Please do not make any changes to the cooling unit
that are not described in these operating instructions
or other applicable assembly and operating instruc-
tions.
– The operational safety of the cooling unit is only war-
ranted if used as intended. The technical specifica-
tions and limit values stated must not be exceeded un-
der any circumstances. In particular, this applies to the
specified ambient temperature range and IP protec-
tion category.
– Operating the cooling unit in direct contact with water,
aggressive materials or inflammable gases and va-
pours is prohibited.
– Other than these general safety instructions, it is also
vital to observe the specific safety instructions when
carrying out the tasks described in the following chap-
ters.
– Please note the maximum weights that may be lifted
by individuals. It may be necessary to use lifting gear.
– Cooling units must be transported in an upright posi-
tion and secured to prevent them from tipping over.
– Shipping braces (such as a structure made from
square timbers or boards) must be used when trans-
porting cooling units already mounted on the enclo-
sure. These braces support the cooling unit and pre-
vent it from slipping in case of impact.
– Use a sufficiently large pallet to prevent it tipping over.
– If the cooling unit has been mounted on a door, close
the door and keep it closed during transportation.
2.2 Operating and technical staff
– The assembly, installation, commissioning, mainte-
nance and repair of this cooling unit may only be per-
formed by qualified, trained personnel.
– Only properly instructed personnel may operate a
cooling unit with the system operational.
– Children and persons with limited cognitive/coordina-
tive abilities must not operate, maintain or clean the
unit or be allowed to use it as a toy.
2.3 Other dangers when using the cooling
unit
When installing the cooling unit (see section 5 "Installa-
tion"), there is a risk that the enclosure could become
unbalanced and tip over.
In such cases, the enclosure should be bolted to the
floor as a precaution.
If the air inlet or outlet of the cooling unit is obstructed,
there is a risk of air short-circuits, resulting in inadequate
climate control.
Please ensure that the electronic assemblies in the en-
closure are installed in accordance with section 5.3.1
"Assembly instructions".
Where applicable, use suitable components to divert
the air.
Please observe the prescribed minimum distances at
the installation site as outlined in section 5.3.1 "As-
sembly instructions".
2.4 IT safety instructions
To ensure the availability, confidentiality and integrity of
data, products, networks and systems must be protect-
ed against unauthorised access.
Such protection can be achieved only with organisation-
al and technical measures. To satisfy the increased safe-
ty requirements, Rittal recommends the observance of
the following measures. Furthermore, more detailed in-
formation can be found on the websites of Bundesamt
für Sicherheit in der Informationstechnik (Federal Office
for IT Security – BSI).
2.4.1 Measures for products and systems
Embed products and systems not in public net-
works.
Make sure that the system is only operated in protect-
ed networks.
Configure the firewall
To protect your networks, and the embedded prod-
ucts and systems against external effects, configure a
firewall.
Also deploy a firewall for segmentation of a network or
to isolate a controller.
Consider defence-in-depth mechanisms during
the planning phase
Consider defence-in-depth mechanisms for your sys-
tem planning.
Defence-in-depth mechanisms cover several levels of
mutually coordinated security measures.
Restrict access authorisations
Restrict access authorisations to networks and sys-
tems to only persons that need an authorisation.

2 Safety instructions
EN
6Rittal enclosure cooling unit
Protect accesses
Do not use the default passwords; instead, use se-
cure, long passwords containing numbers, a mix of
upper case and lower case letters, symbols and no
repetitions.
Create random passwords with a password manager.
Deploy the current firmware version
Ensure that the current Rittal firmware is deployed on
all devices.
The firmware can be downloaded from the associated
product pages in the Internet.
Observe the associated Release Notes for new firm-
ware versions.
Deploy current security software
To identify and eliminate security threats, such as vi-
ruses, trojans and other malicious software, security
software should be installed on all PCs and kept up-
to-date.
Deploy whitelist tools to monitor the device context.
Deploy an intrusion-detection system to validate the
communication of your system.
Perform regular threat analyses
Rittal recommends that you perform regular threat
analyses.
The threat analyses allow you to determine whether
your adopted measures are effective.
Protect USB ports against access
USB ports must be protected against physical access.
Ensure that no unauthorised persons have access to
USB ports.
Sensitive data can be read for an unauthorised access
to USB ports.

Rittal enclosure cooling unit 7
3 Product description
EN
3 Product description
3.1 Functional description and components
3.1.1 Function
There are two separate cooling circuits installed in the
cooling unit.
– One conventional refrigerant circuit (compression sys-
tem), and
– One heat pipe integrated into the condenser and
evaporator coil.
Fig. 1: Cooling circuit
Key
1 Compressor
2 Condenser (dual version)
3Expansionvalve
4 Evaporator coil (dual version)
5 Refrigerant circuit with heat pipe
6 Refrigerant circuit with compression system
7 Internal circuit
8 External circuit
9 Dryer/collector
10 Internal fan
11 External fan
12 PSAHpressure monitor
In both cooling circuits, the individual components are
connected with pipes in which the refrigerant R134a is
circulating. This refrigerant is very environmentally friend-
ly, thanks to the following properties:
– Does not deplete the ozone layer (ozone destruction
potential ODP = 0)
Refrigerant circuit with compression system
The refrigerant circuit with compression system is com-
prised of the following four main components:
1. Evaporator coil
2. Compressor
3. Condenser
4. Expansion valve
The evaporator coil fan draws hot air from the enclosure
in the internal circuit of the cooling unit and passes it
over the evaporator coil. After the evaporator coil, the
cooled air is fed back into the enclosure via the outlet
opening.
The air is cooled down by evaporating the refrigerant in
the evaporator coil. The refrigerant vapour is transported
by the compressor in the external circuit of the cooling
unit to the condenser. There, the refrigerant condenses
and becomes a liquid. The heat produced is dissipated
by the condenser fan. The downstream electronic ex-
pansion valve reduces the high pressure of the refriger-
ant, and the refrigerant is then fed back into the evapo-
rator coil.
Both the compressor and the two fans in the cooling unit
are activated via an inverter. This makes it possible to
control these components, so that the fan and compres-
sor may be activated for a longer time but at a lower out-
put and improved efficiency.
Refrigerant circuit with heat pipe
The additional second refrigerant circuit operates with-
out a compressor, expansion valve or other control ele-
ments, and is integrated into the evaporator coil and
condenser as a heat pipe.
The refrigerant inside the heat pipe (R134a) absorbs
thermal energy from the intake of enclosure air and
evaporates. The gaseous refrigerant then rises through
the pipeline until it reaches the condenser. The refriger-
ant is cooled down again in the condenser (provided Tu
< Ti), and the heat released is emitted into the environ-
ment. Gravity then causes the liquid refrigerant to flow
back down the pipelines. The whole cycle begins again.
3.1.2 Description "chemical version"
The following components of the cooling units are coat-
ed with an additional top coat of clear lacquer in the
"chemical version" (standard paint in the chemical sec-
tor):
– All outer sheet metal parts (chassis and cover)
– I/O board
– Controller/display
–Inverter
The following components of the refrigerant circuit inside
the cooling units that come into contact with the external
polluted air are painted with 2-component PUR paint:
– Heat exchanger (condenser and evaporator) including
pipe bends

3 Product description
EN
8Rittal enclosure cooling unit
– Compressor
– Refrigerant lines and their soldered joints
The paint used is resistant to
– Mineral oils, vegetable oils
– Emulsions for metal cutting
– Nitrogen
– Ammonia vapours (<100000 ppm)
– Hydrogen sulphide (<0.2 ppm)
– Sulphuric acid and sulphurous acid vapours (<2 ppm)
– Vapours of organic carbon disulphides and CS2
– Solutions ph 10 – ph 4 at room temperature
– Aqueous cleaners with surface-active substances,
pH 10 – pH 4 at room temperature
– Diesel at room temperature
– 5minutes exposure to ethanol, isobutanol, and petro-
leum ether at room temperature.
3.1.3 Components
Fig. 2: Main components of cooling unit
Key
1Cover
2 Chassis
3 Connection box
4 Evaporator fan
5Handle
6 Air outlet opening
7 Lower louvred grille for air inlet
8Display
9 Infill panel
10 Upper louvred grille for air outlet
11 Thread for eyebolt
3.1.4 Control
Rittal enclosure cooling units are fitted with a controller
for setting the functions of the cooling unit.
Operation using this controller is described in section 7
"Operation".
3.1.5 Safety devices
– In the refrigerant circuit, the cooling units have a type-
tested pressure monitor (to EN 12263) which switches
off the cooling unit if the maximum admissible pres-
sure is exceeded. Once the pressure drops back be-
low the admissible pressure, the unit will automatically
resume operation.
– Temperature monitoring prevents the evaporator coil
from icing over. If there is a risk of icing, the compres-
sor switches itself off and automatically switches itself
back on again at higher temperatures.
– The compressor is monitored and protected by the in-
verter to prevent overloading.
– The fans have a built-in overload protection with auto-
matic reset.
– In order to allow a reduction of pressure inside the
compressor and hence a safe restart, once it has been
switched off (e.g. upon reaching the set temperature
via the door limit switch function or via de-energising),
the device will switch back on with a delay of 180 sec-
onds.
– The device has floating contacts on the connection
pins on terminals 1 and 3 of the signal connector (X2),
via which system messages from the device may be
polled, e.g. using a PLC (2 x normally closed or nor-
mally open contacts).
3.1.6 Condensation
At high levels of humidity and low temperatures inside
the enclosure, condensate water may form on the evap-
orator coil.
The cooling units have an automatic electrical conden-
sate water evaporator. The thermal component used for
this purpose is based on self-regulating PTC technolo-
gy. Condensate water arising on the evaporator coil is
collected in a tank in the external circuit of the cooling
unit, and partially evaporated via the airflow. When the
water level rises, the water enters the PTC thermal com-
ponent and is evaporated (through-flow heater princi-
ple). The water vapour streams out of the cooling unit
with the airflow from the external fan.
The PTC thermal component is activated automatically
when the compressor is running, and continues to run
for around 15 minutes after the compressor has been
switched off. During the after-run phase, the condenser
fan will likewise continue to run at low speed.
In the event of a short-circuit in the PTC component or if
there is a risk of inverter overload (possible at high ambi-
ent temperatures), the PTC component will be deacti-
vated. This means that any condensate water arising
can be discharged via the safety overflow.

Rittal enclosure cooling unit 9
3 Product description
EN
If the fuse has tripped, any condensate water is drained
off via the safety overflow. The condensation is routed
downwards out of the unit via a drain pipe on the evap-
orator coil divider panel. For this purpose, a hose may be
connected to the condensate water nozzle (see section
5.3.8 "Connect the condensate water discharge").
3.1.7 Filter mats
The entire cooling unit condenser is covered with a dirt-
repelling, easy-to-clean hydrophobic RiNano coating. In
many applications, therefore, the use of filter media is
unnecessary, particularly with dry dusts.
For dry, coarse dust and lint in the ambient air, we rec-
ommend installing an additional PU foam filter mat (avail-
able as an accessory) in the cooling unit. Depending on
the incidence of dust, you will need to replace the filter
mat from time to time (see section 8 "Inspection and
maintenance").
For oily ambient air, we recommend the use of metal fil-
ters (also available as an accessory). These may be
cleaned with suitable detergents and reused.
3.1.8 Door limit switch
The cooling unit may be operated with a floating door
limit switch connected. The door limit switch is available
as accessory from Rittal.
The door limit switch function causes the fans and the
compressor in the cooling unit to gradually slow down
and then switch off after approximately 15 seconds
when the enclosure door is opened (contacts 5 and 6
closed). This prevents the formation of condensate wa-
ter inside the enclosure while the enclosure door is
open. In order to prevent damage to the unit, it is
equipped with an ON delay: The evaporator fan will cut
in again after a delay of a few seconds on closure of the
door.
Please note that no external voltage may be applied to
the door contacts (connection clamps 5 and 6).
3.2 Intended use, foreseeable misuse
The cooling unit is intended exclusively for cooling
closed control cabinets as well as for professional use.
Any other use is not permitted.
The cooling unit is intended for indoor and semi-outdoor
use as standard. Semi-outdoor use is defined as fol-
lows:
– Siting in a roofed outdoor area.
The cooling unit is protected from the direct impacts
of weather conditions such as precipitation or perma-
nent sunlight.
– Always use within the admissible temperature range.
– The device is secure from unauthorized public access.
The cooling unit must not be installed and operated in lo-
cations which are accessible to the general public.
The cooling unit is designed solely for stationary use.
The cooling unit must not be used in environments with
conductive, flammable and explosive dusts.
These include:
– Graphite dusts
– Metal dusts
– Cereal dusts
– Wood dusts
– Textile fibres and lint
The cooling unit is state of the art and built according to
recognised safety regulations. Nevertheless, improper
use can pose a threat to the life and limb of the user or
third parties, or result in possible damage to the system
and other property.
Consequently, the cooling unit must only be used prop-
erly and in a technically sound condition! Any malfunc-
tions which impair safety should be rectified immediate-
ly.
Proper use also includes the observance of the docu-
mentation provided, and compliance with the inspection
and maintenance conditions.
Rittal GmbH & Co. KG is not liable for any damage which
may result from failure to comply with the documenta-
tion provided. The same applies to failure to comply with
the valid documentation for any accessories used.
Inappropriate use may be dangerous. Examples of inap-
propriate include:
– Use of the cooling unit over long periods with the en-
closure open.
– Use of impermissible tools.
– Improper operation.
– Improper rectification of malfunctions.
– Use of accessories not approved by Rittal GmbH &
Co. KG.

3 Product description
EN
10 Rittal enclosure cooling unit
3.3 Scope of supply
Description Illustration SK 3185x3x SK 3186x3x
SK 3187x3x
SK 3188x4x
SK 3189x4x
Enclosure cooling unit 1x
Shipping bag with
– Assembly and installation instructions 1x
– Grub screw M8 x 40 mm 6x
–NutM8 6x
–WasherM8 6x
– Sealing tape 10x10 mm 1x2.7 m 1x4.1 m
– Spring terminal 4x 6x
– Corner bracket 4x
– L-shaped bracket 2x –
–Clip 2x
– Attachment for partial installation 1x
–T-rail 1x
– Connector 1x
– Signal connector 1x
– Ferrite core 1x
Tab. 1: Scope of supply

Rittal enclosure cooling unit 11
4 Transport and handling
EN
4 Transport and handling
4.1 Delivery
The cooling unit is supplied in one packaging unit.
Check the packaging carefully for signs of damage.
Traces of oil on damaged packaging indicate a loss of
refrigerant and/or a leak in the cooling unit. Any pack-
aging damage may be the cause of a subsequent
functional failure.
4.2 Unpacking
Remove the packaging materials from the cooling unit.
Check the cooling unit for any damage that may have
occurred during transport.
Check the supply contents for completeness (see sec-
tion 3.3 "Scope of supply").
4.3 Transport
Depending on the chosen version, the cooling unit may
weigh up to 73 kg. The components in the cooling unit
chassis account for the bulk of the weight.
At the rear of the cooling unit is a handle which can be
used to briefly lift the cooling unit when inserting into the
mounting cut-out.
There is also an M12 thread at the top of the chassis,
into which a Rittal eyebolt (e.g. belonging to an enclo-
sure) may be screw-fastened. The cooling unit is readily
transported with the aid of lifting gear and an indoor
crane.
Fig. 3: Thread and eyebolt on top of the chassis
Key
1Eyebolt
2 M12 thread
Before transporting by crane, please ensure that the
lifting gear and crane have sufficient load capacity to
transport the cooling unit safely.
Never allow anyone to stand beneath a suspended
load, even for a short time, during transportation by
crane.
Protect the lifting gear on the crane hook from load de-
flection, because the load's centre of gravity may be
off-centre.
First position the cooling unit close to the installation
site and protect from accidentally being knocked over.
Transporting a pre-assembled unit
Shipping braces (such as a structure made from
square timbers or boards) must be used when trans-
porting cooling units already mounted on the enclo-
sure.
These braces support the cooling unit and prevent it
from slipping in case of impact.
Use a sufficiently large pallet to prevent it tipping over.
If the cooling unit has been mounted on a door, close
the door and keep it closed during transportation.
Fig. 4: Shipping braces
Key
1 Fitted cooling unit
2 Supporting structure
3 Pallet underneath the cooling unit
Note:
After unpacking, the packaging materials
must be disposed of in an environmentally
friendly way.
Note:
Damage and other faults, e.g. incomplete de-
livery, should be reported immediately, in
writing, to the shipping company and to Rittal
GmbH & Co. KG.
Warning!
Please note the maximum weights that
may be lifted by individuals. It may be
necessary to use lifting gear.
Note:
An eyebolt with M12 thread may be ordered
as an accessory from Rittal (see section 13
"Accessories").

5 Installation
EN
12 Rittal enclosure cooling unit
5 Installation
5.1 Safety instructions
Please be sure to observe the applicable regulations
governing electrical installations of the country in
which the device is installed and operated, as well as
national regulations for accident prevention. Please
also observe any internal company regulations, such
as work, operating and safety regulations.
The technical specifications and limit values stated
must not be exceeded under any circumstances. In
particular, this applies to the specified ambient tem-
perature range and IP protection category.
5.2 Siting location requirements
When choosing the installation site for the enclosure,
please observe the following:
– The site for the enclosure, and hence the positioning
of the cooling unit, must be carefully selected so as to
ensure good ventilation (clearance between cooling
units and clearance between a cooling unit and the
wall must be at least 200 mm in each case).
– The cooling unit must be installed and operated with a
maximum deviation of 2° from the vertical.
– The installation site must be free from excessive dirt,
aggressive ambient conditions and moisture.
– The ambient temperature must not exceed 60 °C
(140 °F).
– It must be possible to fit a condensate water discharge
(see section 5.3.8 "Connect the condensate water
discharge").
– The mains connection data as stated on the rating
plate of the cooling unit must be guaranteed.
Size of installation room
–Unit SK 3185x3x must not be installed in rooms of
less than 3 m³.
–Units SK 3186x3x and SK 3187x3x must not be in-
stalled in rooms of less than 6 m³.
–Units SK 3188x4x and SK 3189x4x must not be in-
stalled in rooms of less than 12 m³.
Electromagnetic interference (EMI)
– Interfering electrical installations (high frequency) must
be avoided.
– Signal cables must be laid separately from live cables
(fig. 20).
5.3 Assembly procedure
5.3.1 Assembly instructions
Before assembling, please ensure that the enclosure
is sealed on all sides (IP 54). Increased condensation
will occur later during operation if the enclosure is not
airtight.
If applicable, additionally fit a door limit switch (such as
4127010) to the enclosure which switches off the
cooling unit when the enclosure door is opened to pre-
vent excessive condensation (see section 3.1.8 "Door
limit switch").
Please ensure that the electronic assemblies in the en-
closure allow the even circulation of air.
Warning!
Please note the maximum weights that
may be lifted by individuals. It may be
necessary to use lifting gear.
Warning!
Work on electrical systems or equip-
ment may only be carried out by an elec-
trician or by trained personnel under the
guidance and supervision of an electri-
cian. All work must be carried out in ac-
cordance with electrical engineering
regulations.
The cooling unit may only be connected
after the aforementioned personnel have
read this information!
Use only insulated tools.
Follow the connection regulations of the
appropriate electrical supply company.
The cooling unit must be connected to
the mains via an all-pole disconnecting
device to overvoltage category III
(IEC 61058).
The cooling unit is not de-energised until
all of the voltage sources have been dis-
connected!

Rittal enclosure cooling unit 13
5 Installation
EN
Fig. 5: Air circulation inside the enclosure
Under no circumstances should the air inlet and outlet
openings of the cooling unit be obstructed. Only in this
way is it possible to ensure that the maximum cooling
output is available.
Please ensure that the cold airflow from the cooling
unit is not directed at active components.
Fig. 6: Never direct the cold airflow at active components
(example illustration)
If appropriate, install components to divert the air.
When installing in a dismantled door or side panel,
please ensure that it cannot fall over when installing
the cooling unit in the mounting cut-out.
5.3.2 Mounting options
In principle, there are three different options for installing
the cooling unit on an enclosure door or side panel.
Fig. 7: Mounting options (example illustration)
Key
1 External mounting
2 Partial internal mounting
3 Full internal mounting
– External mounting: All of the cooling unit is outside the
enclosure.
– Partial internal mounting: The cooling unit chassis is in-
side the enclosure, while the cover and the louvred
grilles are outside.
– Full internal mounting: All of the cooling unit is inside
the enclosure. Only the louvred grilles project on the
outside.
Your chosen installation option will ultimately depend on
how much space you require inside and outside of the
enclosure. The various mounting options have no influ-
Model No. Dimensions x and y [mm]
SK 3185xxx 195
SK 3186xxx/SK 3187xxx 185
SK 3188xxx/SK 3189xxx 200
Tab. 2: Dimensions "x" and "y"
Note:
The pictures in this chapter illustrate the in-
stallation of the cooling unit in an enclosure
door. Installation in a side panel is carried out
in the same way.
Note:
– Full internal mounting of the 4 kW and 6 kW
cooling unit is not possible.
– For enclosures with 500 mm depth, 2 kW
to 6 kW units may only be externally
mounted on the side panel.
– For the 1.6 kW unit, all mounting variants
are supported, even for enclosures with
500 mm depth.

5 Installation
EN
14 Rittal enclosure cooling unit
ence on the cooling output of the cooling unit, which re-
mains the same in all cases.
– If there are a large number of components installed in-
side the enclosure, external mounting or partial in-
ternal mounting of the cooling unit may be appropri-
ate. In such cases, the space inside the enclosure may
be insufficient for full internal mounting, or it may not
be possible to guarantee adequate cooling of all com-
ponents inside the enclosure.
– If the space surrounding the enclosure is limited,
full internal mounting may be suitable, so as to keep
essential escape routes clear.
5.3.3 Make a mounting cut-out in the enclosure
In order to mount the cooling unit on the enclosure, a
suitable mounting cut-out must be made in the door or
side panel of the enclosure. In principle, the mounting
cut-out is identical for all three mounting options. Only
the external mounting of 2 kW to 6 kW units (i.e. all units,
except for the 1.6 kW unit 3185x3x) on the side panel of
a 500 mm deep enclosure requires a special mounting
cut-out.
Using the diagrams in section 12.1 "Representation of
mounting cut-outs", calculate the required dimensions
for your mounting cut-out.
Drill all the required holes and make the mounting cut-
out.
Carefully deburr all drilled holes and the cut-out to pre-
vent injuries caused by sharp edges.
Note:
The dimensions of the mounting cut-outs
can be found in section 12.1 "Representation
of mounting cut-outs".
Caution!
Drilled holes and cut-outs that have not
been fully deburred may cause cut inju-
ries, particularly when assembling the
cooling unit.

Rittal enclosure cooling unit 15
5 Installation
EN
5.3.4 External mounting of the cooling unit
Fig. 8: Assembly video "External mounting, 600 mm"
(example illustration)
Cut the sealing tape in the dispatch bag to the re-
quired length so that it can be placed all the way round
the rear of the cooling unit once.
Start by positioning the sealing tape on the bottom
edge, so that the joint between the two ends of the
sealing tape is likewise on the lower edge of the unit.
Carefully stick the sealing tape as close to the edge as
possible on the rear of the cooling unit.
Screw the two threaded bolts into the external blind
threaded bushes at the bottom rear of the cooling unit.
Push the two locating springs included with the supply
into the relevant holes at the top edge of the cooling
unit at the rear.
These locating springs will prevent the cooling unit
from falling out of the mounting cut-out later on before
it is properly secured with the threaded bolt.
Lift up the cooling unit, preferably with a lifting eye us-
ing suitable lifting gear, and initially set the cooling unit
down with the two bottom threaded bolts on the door
or side panel of the enclosure.
If transportation by crane is not possible, lift the cool-
ing unit into the mounting cut-out in the same way us-
ing the handle.
Push the cooling unit into the mounting cut-out at the
top until the locating springs behind the cut-out latch
home.
Screw the two threaded bolts into the external blind
threaded bushes at the top rear of the cooling unit.
Attach the two corner brackets to the threaded bolts
at the top and secure with the corresponding washers
and hex nuts (maximum torque: 5 Nm).
Next, attach the two corner brackets to the threaded
bolts at the bottom and secure with the corresponding
washers and hex nuts (maximum torque: 5 Nm).
Insert the six spring terminals (or four spring terminals
for the 1.6 kW unit 3185x3x) into the rear of the cooling
unit.
These spring terminals ensure that the cooling unit is
directly in contact with the mounting cut-out of the en-
closure door over the entire height.
If applicable, re-attach the door or side panel including
cooling unit to the enclosure, if not mounted directly
on the enclosure.

5 Installation
EN
16 Rittal enclosure cooling unit
5.3.5 Mounting the cooling unit externally on a
500 mm deep enclosure
Fig. 9: Assembly video "External mounting, 500 mm"
Cut the sealing tape in the dispatch bag to the re-
quired length so that it can be placed all the way round
the rear of the cooling unit once.
Start by positioning the sealing tape on the bottom
edge, so that the joint between the two ends of the
sealing tape is likewise on the lower edge of the unit.
Carefully stick the sealing tape as close to the edge as
possible on the rear of the cooling unit.
Push the two locating springs included with the supply
into the relevant holes at the top edge of the cooling
unit at the rear.
These locating springs will prevent the cooling unit
from falling out of the mounting cut-out later on before
it is properly secured with the threaded bolt.
First, screw the two threaded bolts into the internal
blind threaded bushes at the top rear of the cooling
unit.
Then, screw the two threaded bolts into the blind
threaded bushes half-way up the rear of the cooling
unit.
Finally, screw the two threaded bolts into the internal
blind threaded bushes at the bottom rear of the cool-
ing unit.
Lift up the cooling unit, preferably with a lifting eye
using suitable lifting gear, and set it down with the
threaded bolts in the relevant holes of the enclosure.
Push the cooling unit into the mounting cut-out at the
top until the locating springs behind the cut-out latch
home.
Attach the two corner brackets to the threaded bolts
at the top and secure with the corresponding washers
and hex nuts (maximum torque: 5 Nm).
Secure the remaining threaded bolts at the bottom
with the corresponding washers and hex nuts (maxi-
mum torque: 5 Nm).

Note:
The description in this section applies to the
external mounting of 2 kW to 6 kW cooling
units on the side panel of a 500 mm deep en-
closure. External mounting on deeper enclo-
sures is also possible with this mounting
method.
For the 1.6 kW unit, external mounting on a
500 mm deep enclosure uses the same
mounting cut-out as a wider enclosure (see
section5.3.4 "External mounting of the cool-
ing unit").

Rittal enclosure cooling unit 17
5 Installation
EN
5.3.6 Partial internal mounting of the cooling unit
Fig. 10: Mounting video "Partial internal mounting" (example
illustration)
At the front of the cooling unit, pull the top louvred
grille away from the mounting clips on the cover, and
place or lay it down somewhere safe.
Flip open the bottom louvred grille below the infill pan-
el.
Release the two stays in the hinge mechanism at the
top from the brackets attached to the cover of the
cooling unit.
Pull the bottom louvred grille forwards out of its hold-
ers, and place or lay it down somewhere safe.
Gently pull the infill panel including display forwards to
release it from the mounting clips on the cover.
On the rear of the display, disconnect both of the con-
nectors (PE conductor and connection) and remove
the infill panel completely from the cooling unit.
Place the infill panel somewhere safe.
Carefully push the connector including connection ca-
ble inwards through the cable gland in the cover.
Loosen the four threaded bolts in the corners of the
cover which connect the cover to the chassis.
Carefully pull the cover forwards (approx. 5 cm) from
the chassis.
The PE conductor connection between the cover and
the chassis is located on the left-hand side, around
half-way up.
Pull the flat-pin connector of the PE conductor off in-
wards, preferable on the chassis.
Remove the cover completely from the chassis, and
place or lay it down somewhere safe.
There is a clip prefitted to the top edge of the chassis
on the front. This clip will later prevent the chassis from
falling out of the mounting cut-out before it is properly
secured with the threaded bolt.
Lift up the chassis, preferably with a lifting eye using
suitable lifting gear, and insert it into the mounting cut-
out in the door or side panel of the enclosure from the
inside with the edge fold at the bottom of the chassis.
If transportation by crane is not possible, lift the chas-
sis into the mounting cut-out in the same way using
the handle.
Push the chassis into the mounting cut-out at the top
until the clip behind the cut-out latches home.
Make sure that the clip behind the cut-out is fully
snapped in towards the top.
Please also insert the wedge element from the exterior
up to the stop in order to fasten the clip in the upper
position.
Set the cover down at the front near the chassis.
Slide the flat-pin connector of the PE conductor into
place, and ensure that the cover and chassis are con-
nected.
Place the cover fully over the chassis, and connect the
cover and the chassis using the four threaded bolts in
the corners of the cover.
Tighten the four threaded bolts in the corners of the
cover to reconnect the cover with the punched section
(maximum torque: 4 Nm).
Thread the connection cables of the display outwards
through the cable gland in the cover.
Connect the PE conductor and connector at the rear
of the display.
Install the complete infill panel on the cooling unit.
Place the bottom louvred grille onto the holders and
secure the two stays at the top of the hinge mecha-
nism into the brackets attached to the cover of the
cooling unit.
Finally, replace the top louvred grille onto the cover.
If applicable, re-attach the door or side panel including
cooling unit to the enclosure, if not assembled directly
on the enclosure.
Caution!
The cooling unit will only be stable as
long as the cover and chassis are con-
nected. For this reason, be sure to brace
the chassis, in particular, to prevent it
from falling over before removing the
cover.
Warning!
The PE conductor which connects the
cover and the chassis must be connect-
ed to both connectors in all cases. Oth-
erwise, there is a risk of injury from
electric shock if the unit connection was
faulty or defective.

5 Installation
EN
18 Rittal enclosure cooling unit
5.3.7 Full internal mounting of the cooling unit
Fig. 11: Mounting video "Full internal mounting" (example illus-
tration)
First, dismantle the top and bottom louvred grilles as
well as the infill panel and the display in the same way
as for partial internal mounting (see section 5.3.6 "Par-
tial internal mounting of the cooling unit").
Cut the sealing tape in the dispatch bag to the re-
quired length so that it can be placed all the way round
the cover once.
Start sticking the sealing tape at the bottom edge, so
that the joint between the two ends of the sealing tape
is likewise on the bottom edge of the unit.
Carefully stick the sealing tape as close as possible to
the edge of the cover.
On the front top edge of the cover, push the locating
springs included with the supply into the relevant
holes.
These locating springs will prevent the cooling unit
from falling out of the mounting cut-out later on before
it is properly secured with the threaded bolt.
Lift up the cooling unit, preferably with a lifting eye us-
ing suitable lifting gear.
If transportation by crane is not possible, lift the cool-
ing unit into the mounting cut-out in the same way us-
ing the handle.
Position it in the mounting cut-out in the door or side
panel of the enclosure with the two brackets at the
bottom of the cover.
Push the cooling unit into the mounting cut-out at the
top until the locating springs behind the cut-out latch
home.
Mount the corner brackets onto the top two threaded
bolts from the outside.
Mount the L-shaped brackets onto the bottom two
threaded bolts from the outside.
Next, working from the outside of the enclosure, se-
cure the four threaded bolts in the corners of the cover
using the corresponding washers and hex nuts from
the pack (maximum torque: 5 Nm).
Insert the six spring terminals (or two spring terminals
for the 1.6 kW unit 3185x3x) into the cover of the cool-
ing unit.
These spring terminals ensure that the cooling unit is
directly in contact with the mounting cut-out of the en-
closure door over the entire height.
Connect the PE conductor and connector at the rear
of the display.
Install the complete infill panel on the cooling unit.
Place the bottom louvred grilles onto the holders and
secure the two stays of the top hinge mechanism into
the brackets attached to the cooling unit cover.
Finally, replace the top louvred grille onto the cover.
If applicable, re-attach the door or side panel including
cooling unit to the enclosure if not mounting directly on
the enclosure.
5.3.8 Connect the condensate water discharge
There is a condensate water evaporator fitted in the ex-
ternal circuit of the cooling unit. With an enclosure con-
nected, this condensate water evaporator may typically
evaporate condensate water volumes of up to 100 ml/h.
If larger quantities of condensate water are produced, a
condensate water discharge hose may additionally be
fitted. This hose allows condensate water to be routed
out of the cooling unit pressurelessly. A suitable hose is
available as an accessory from Rittal (see section 13
"Accessories").
Please follow the instructions given below:
– The hose must be laid with an adequate and constant
gradient to prevent siphoning.
– The hose must be laid without any kinks.
– If extended, the cross-section of the hose must not be
reduced.
– The hose should be routed to a drain or external con-
densate water evaporator by the customer.
Fig. 12: Connection for condensate water discharge hose
Key
1 Connection point
2 Hole in enclosure for hose
Connect a suitable hose to the condensate water dis-
charge nozzle and secure using a hose clip.
Lay the hose as per the instructions above.

Rittal enclosure cooling unit 19
5 Installation
EN
5.4 Electrical connection
5.4.1 Notes on electrical installation
When carrying out the electrical installation, it is impor-
tant to observe all valid national and regional regula-
tions as well as the provisions of the responsible
power supply company.
– Electrical installation must only be carried out by a
qualified electrician who is responsible for compliance
with the existing standards and regulations.
– All cables routed into the wiring compartment have to
be insulated for the maximum voltage of the power
supply.
Connection data
– The connected voltage and frequency must corre-
spond to the ranges stated on the rating plate. The
units support multiple voltages.
– The cooling unit must be connected to the mains via
an all-pole disconnect to overvoltage category III (IEC
61058-1).
– The unit is intrinsically safe and does not require any
additional external safety devices for safe operation.
– The connection cable must be protected with a minia-
ture circuit-breaker.
– No additional temperature control may be connected
upstream of the unit at the supply end
– To ensure the proper functioning of internal presso-
stats in the event of a malfunction, a line fuse of no less
than 15 A is required.
– If a motor circuit-breaker or circuit-breaker is used, it
should be selected in accordance with EN 60898-1
(tripping characteristic type D).
– For applications in UL-approved facilities, any CCMR-
type fuse from Littelfuse may be used, or alternatively,
a UL-certified air circuit-breaker.
– Suitable miniature circuit-breakers and circuit-break-
ers can be found under Rittal accessories (see sec-
tion10 "Technical specifications" and section13 "Ac-
cessories").
– Thanks to the integral inverter technology, convention-
al start-up currents (start-up of internal motors) are not
externally visible.
– The mains infeed and the signal cable may optionally
be of a shielded design.
– Low-noise potential equalisation must be guaranteed
with the mains connection.
Overvoltage protection and supply line load
Rittal recommends the following measures for protect-
ing the cooling units in non-standard environmental and
connection conditions.
– The unit does not have its own overvoltage protection.
Measures must be taken at the supply end by the
switchgear manufacturer or operator to ensure effec-
tive protection against lightning and overvoltage.
– The units are classified as overvoltage category III and
meet the requirements of EN 60204-1 on the electrical
equipment of machines. The mains voltage must not
deviate by more than the tolerance specified in sec-
tion10 "Technical specifications".
– The discharge current may exceed 3.5 mA.
– The units are high-voltage tested ex works. An addi-
tional high voltage test must only be carried out with a
DC voltage supply source (1500 VDC max.).
– EMC interference signals arising in local industry and
plant networks may deviate significantly from those
specified in the standards. In these types of network
situations, an external EMC filter should be used.
– If the combined output of the frequency converters,
power converters or transformers in the network
where the device is being operated is >70 kVA, the
customer must connect a Class II surge voltage pro-
tector in the mains supply line upstream of the cooling
unit. The surge voltage protector must be designed to
EN 61800 -1. The following values may be assumed
as starting-points for the design:
Technical specifications for a suitable overvoltage pro-
tection module:
– Terminal voltage Uc = 350…400 V, 50/60 Hz
– Maximum current Imax = 40 kA
– Rated current In = 20 kA
– Breakdown voltage Up = 1.75 kV
Three-phase devices
– There is no need to observe a counterclockwise or
clockwise phase rotation when making the electrical
connection for inverter devices in the three-phase ver-
sion. The electronics incorporated into the devices au-
tomatically create the required phase rotation.
– In three-phase devices, the absence of a phase is de-
tected, and the device is switched off.
– Outgoing equipment is monitored by the inverter, and
deactivated in the event of a malfunction in the elec-
tricity supply.
Door limit switch
– Each door limit switch can only be assigned to one
cooling unit.
– Several door limit switches may be operated in parallel
with one cooling unit.
Transformers,
power electronics
Assumed discharge
energy
70 kVA…100kVA 40J
100 kVA…200kVA 80J
200 kVA…400kVA 160J
400 kVA…800kVA 320J
Tab. 3: Design of the surge voltage protector

5 Installation
EN
20 Rittal enclosure cooling unit
– The minimum cross-section for the connection cable
is 0.3 mm² for a cable length of 2 m.
– The line resistance to the door limit switch must not
exceed a maximum of 50 Ω.
– The maximum admissible line length is 10 m.
– The door limit switch only supports a floating connec-
tion; no external voltages.
– The contact of the door limit switch must be closed
when the door is open.
– The safety extra-low voltage for the door limit switch is
provided by the internal power pack: Current approx.
5mADC.
Connect the door limit switch to terminals 5 and 6 of
the signal connector.
Fig. 13: Connections at rear (example illustration)
Key
1 Connection for IoT interface 3124300 (X3)
2 Connection for signal connector (X2)
3 Connection for mains connector (X1)
Installing the ferrite core
Attach the ferrite core from the scope of delivery to the
signal cables near the connection plug to prevent in-
terference in the signal transmission.
Fig. 14: Signal cable with mounted ferrite core
Potential equalisation
If, for EMC reasons, the unit is to be integrated into the
customer's existing potential equalisation system, a
conductor may be connected to the potential equalisa-
tion connection point. The connection point is labelled
with the required switch symbol.
Fig. 15: Connection point for potential equalisation (example il-
lustration)
Key
1 Connection point M6
Attach the potential equalisation to the unit's connec-
tion point using the screw, washer and contact wash-
er.
Fig. 16: Potential equalisation arrangement
Key
1 Ring terminal with PE conductor
2 Contact washer
3Washer
4 Screw