FRIEDHELM LOH Rittal 3302.3 Series User manual

Enclosure cooling unit
Assembly and operating instructions
3302.xxx
3302.3xx
3303.xxx
3304.xxx
3305.xxx
3328.xxx
3329.xxx
3332.xxx
3361.xxx
3366.xxx

Contents
EN
2Rittal enclosure cooling unit
Contents
1 Notes on documentation .................. 3
1.1 CE labelling.................................................. 3
1.2 Storing the documents................................. 3
1.3 Symbols used in these operating instructions 3
1.4 Other applicable documents ........................ 3
2 Safety notes ..................................... 3
3 Device description ............................ 4
3.1 TÜV-tested output measurement to
DIN EN 14511 .............................................. 4
3.2 Functional description .................................. 4
3.2.1 How it works ......................................................... 4
3.2.2 Control .................................................................. 5
3.2.3 Bus mode (e-Comfort controller only) .................... 5
3.2.4 Safety devices ....................................................... 5
3.2.5 Condensation ....................................................... 5
3.2.6 Filter mats ............................................................. 5
3.2.7 Door limit switch ................................................... 5
3.2.8 Additional interface X3 .......................................... 6
3.3 Proper use, foreseeable misuse ................... 6
3.4 Scope of supply........................................... 6
4 Assembly and connection ................ 6
4.1 Choosing the installation site........................ 6
4.2 Notes on assembly ...................................... 6
4.2.1 General ................................................................. 6
4.2.2 Layout of the electronic components in the
enclosure .............................................................. 7
4.3 Fitting the cooling unit .................................. 7
4.3.1 Making the cut-outs .............................................. 8
4.3.2 External mounting of the cooling unit ..................... 8
4.3.3 Partial internal mounting of the cooling unit ........... 8
4.3.4 Full internal mounting of the cooling unit ................ 9
4.4 Connecting the condensate discharge ....... 10
4.5 Notes on electrical installation .................... 11
4.5.1 Connection data ................................................. 11
4.5.2 Overvoltage protection and supply line load ........ 11
4.5.3 Three-phase devices ........................................... 11
4.5.4 Door limit switch ................................................. 11
4.5.5 Notes on the flicker standard .............................. 11
4.5.6 Potential equalisation .......................................... 12
4.6 Making the electrical connection ................ 12
4.6.1 Bus connection (only when interconnecting several
units with a Comfort controller) ............................ 12
4.6.2 Connection X3 for serial interface ........................ 12
4.6.3 Mounting external transformer ............................. 12
4.6.4 Installing the power supply .................................. 13
4.7 Finalising assembly .................................... 15
4.7.1 Installing the filter media ...................................... 15
4.7.2 Fitting the cooling unit ......................................... 15
4.7.3 Setting the filter mat monitor (only with e-Comfort
controller) ............................................................ 16
5 Start-up .......................................... 16
6 Operation ....................................... 16
6.1 Control using the Basic controller............... 16
6.1.1 Properties ........................................................... 16
6.1.2 Operating and error display ................................. 17
6.1.3 Test mode with the Basic controller .................... 18
6.1.4 Setting the temperature ...................................... 18
6.1.5 Resetting the Basic controller .............................. 18
6.2 Control using the e-Comfort controller........ 18
6.2.1 Properties ........................................................... 19
6.2.2 Eco mode ........................................................... 19
6.2.3 Launching test mode .......................................... 19
6.2.4 General information about programming ............. 20
6.2.5 Editable parameters ............................................ 21
6.2.6 Programming overview ....................................... 22
6.2.7 Defining system messages for evaluation ............ 23
6.2.8 Setting the master/slave identifier ........................ 24
6.2.9 Evaluating system messages .............................. 24
6.2.10 Reset the e-Comfort controller ............................ 26
7 Inspection and maintenance .......... 26
7.1 Compressed air cleaning 3304.xxx,
3305.xxx .................................................... 26
7.2 Compressed air cleaning 3328.xxx,
3329.xxx, 3332.xxx .................................... 30
7.3 Installation instructions for NEMA 4X
devices ...................................................... 35
8 Storage and disposal ..................... 36
9 Technical details ............................ 36
9.1 Technical specifications.............................. 36
9.2 Performance diagrams............................... 43
10 List of spare parts .......................... 44
11 Appendix ....................................... 47
11.1 Cut-out and hole sizes ............................... 47
11.1.1 Dimensions for external mounting ....................... 47
11.1.2 Dimensions for partial internal mounting .............. 50
11.1.3 Dimensions for full internal mounting ................... 51
11.2 Electrical wiring plan................................... 52

Rittal enclosure cooling unit 3
1 Notes on documentation
EN
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 Di-
rective 2006/42/EC and EMC Directive 2014/30/EC. A
corresponding declaration of conformity has been is-
sued. This can be found at the end of this document, or
on the Rittal homepage.
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 in paper and digital
format are available for the unit types described here.
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.
2 Safety notes
Please observe the following general safety notes when
assembling and operating the unit:
– Assembly, installation and servicing may only be per-
formed by properly trained specialists.
– Screw the enclosure to the floor to prevent it from tip-
ping over when the cooling unit is installed.
– Do not obstruct the air inlet and air outlet of the cooling
unit inside and outside the enclosure (see sec-
tion4.2.2 "Layout of the electronic components in the
enclosure").
– To ensure problem-free opening and closing of the en-
closure door, use a ride-up door roller (refer to the ac-
cessories in the Rittal Catalogue). This raises the door
slightly and balances out the weight of the cooling unit,
to prevent buckling of the door and associated seal
problems.
– The heat loss of the components installed in the enclo-
sure must not exceed the useful cooling power of the
cooling unit.
– Cooling units with item numbers: 3303.xxx, 3361.xxx,
3304.xxx, 3305.xxx, 3328.xxx, 3329.xxx and
3332.xxx must be transported in an upright position
and protected from tipping over.
– Units with item numbers 3302.xxx and 3366.xxx must
be transported lying flat.
– Shipping braces must be used when transporting a
unit that has already been mounted (on the enclosure).
A wooden structure made from square timbers or
boards to support the cooling unit at the bottom (see
fig. 1) is suitable for this purpose. The pallet should be
big enough to prevent the enclosure and cooling unit
overturning. If the cooling unit is mounted on a door,
ensure the door is kept closed during transport.
– Use only original spare parts and accessories
– Do not make any changes to the cooling unit other
than those described in these instructions or associat-
ed instructions.
– Risk of burns! On cooling units with automatic con-
densate evaporation, the surface of the thermal ele-
ment will get very hot during operation, and will remain
so for some time afterwards.
– The mains connector of the cooling unit must only be
connected and disconnected with the system de-en-
ergised. Connect the protective device specified on
the rating plate.
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.

3 Device description
EN
4Rittal enclosure cooling unit
Fig. 1: Transporting an enclosure/cooling unit combination
3 Device description
Depending on the model chosen, your cooling unit may
vary in appearance from the illustrations contained in
these instructions. However, the functions are identical
in principle.
Fig. 2: Device description
Key
1 Blind rivet nut
2Evaporatorfan
3 Electrical wiring plan
4 X2 master-slave connection
5 X3 optional serial interface
6 X1 terminal strip
7 Air outlet hole
8 Front half of the enclosure
9 Rear half of the enclosure
10 Louvred grille for air outlet
11 Display
12 Infill panel
13 Louvred grille for air inlet
14 Rating plate
15 Condensate discharge
16 Dispatch bag
3.1 TÜV-tested output measurement to
DIN EN 14511
All TopTherm cooling units in the output range from 300
to 4000 W are tested to the latest EN 14511-1-4:2013-
12 standard by independent test institute TÜV Nord.
This means you have peace of mind about the design of
the climate control solution and you can be sure you are
getting the performance you are paying for.
3.2 Functional description
3.2.1 How it works
The cooling unit (compression refrigeration system)
comprises four main components (see fig. 3): the evap-
orator (1), the refrigerant compressor (2), the condenser
(3), and the control or expansion valve (4), which are
connected by suitable pipework. This circuit is filled with
a readily boiling substance, the refrigerant. The refriger-
ant R134a (CH2FCF3) is chlorine-free. Its Ozone Deple-
tion Potential (ODP) is 0, making it very eco-friendly. A fil-
ter dryer (5) which is integrated into the hermetically
sealed cooling circuit provides effective protection
against moisture, acid, dirt particles, and foreign bodies
within the cooling circuit.
Fig. 3: Cooling circuit
In the evaporator coil (1), the liquid refrigerant is convert-
ed to a gaseous state. The energy needed for this pur-
pose is taken from the enclosure air in the form of heat,
which has the effect of cooling the enclosure air. In the
compressor (2), the refrigerant is heavily compressed,
so that it achieves a higher temperature inside the con-
denser (3) than the ambient air. This means that excess
heat may be emitted to the ambient air via the surface of
the condenser, as a result of which the temperature of
the refrigerant drops and it is converted back into liquid.
It is re-injected into the evaporator coil via a thermostatic
expansion valve (4), which causes it to cool down fur-
ther, and is then once again able to absorb the energy
from the enclosure air in the evaporator coil. The whole
cycle begins again.
Enclosure
Support
Cooling unit
10
9
8
11
13
12
16
15
14
1
2
4
5
6
7
3
PSAH-
Pressure
switch
Condenser fan
Expansion valve (4)
Temperature
control
Filter dryer (5)
Internal circuit
Compressor (2)
External circuit
Evaporator fan
Evaporator coil (1)
Condenser (3)

Rittal enclosure cooling unit 5
3 Device description
EN
3.2.2 Control
Rittal enclosure cooling units are fitted with a controller
for setting the functions of the cooling unit.
Depending on the design, this is either a Basic controller
(operating status display via LED) or an e-Comfort con-
troller (display plus extended functions, see section6
"Operation").
3.2.3 Bus mode (e-Comfort controller only)
The serial unit interface X2 allows you to create a bus
connection with up to ten cooling units using the master-
slave cable (shielded, four-wire cable, Model No.
3124.100). This allows you to implement the following
functions:
– Parallel unit control (the cooling units in the network
can be switched on and off simultaneously)
– Parallel door status message ("door open")
– Parallel collective fault message
Data is exchanged via the master-slave connection.
During commissioning, assign an address to each unit
that also includes the identifier "master" or "slave".
3.2.4 Safety devices
– In the cooling cycle, the cooling units (with the excep-
tion of type 3302.xxx) have a tested pressure switch to
EN 12 263 which is set to maximum PS (permissible
pressure); this operates via an automatic reset device
whenever the pressure drops again
– 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 refrigerant compressor and the fans are equipped
with thermal winding shields to protect against excess
current and excess temperatures
– 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 (terminals 3 – 5), via which system messages
from the device may be polled, e.g. using a PLC (1 x
change-over contact Basic controller, 2 x normally
open contacts e-Comfort controller)
3.2.5 Condensation
At high levels of humidity and low temperatures inside
the enclosure, condensation may form on the evapora-
tor coil.
The cooling units (except 3302.xxx, 3303.xxx and
3361.xxx) have automatic, electric condensate evapora-
tion. The thermal component used for this purpose is
based on self-regulating PTC technology. Condensate
arising on the evaporator coil is collected in a tank in the
external circuit of the cooling unit, and partially evaporat-
ed via the airflow. When the water level rises, the water
enters the PTC thermal component and is evaporated
(through-flow heater principle). The water vapour
streams out of the cooling unit with the airflow from the
external fan.
The PTC thermal component is permanently connected
and has no switchpoint. It is protected against short-cir-
cuits with miniature fuses (F1.1, F1.2). If the fuse has
tripped, any condensation is drained off via the safety
overflow.
For unit types 3302.xxx, 3303.xxx and 3361.xxx, the
condensate is routed downwards out of the unit via a
drain pipe on the evaporator coil divider panel. For this
purpose, a hose must be connected to the condensate
nozzle (see section4.4 "Connecting the condensate
discharge"). External condensate evaporators are avail-
able as accessories for these unit types (refer also to the
accessories in the Rittal Catalogue).
3.2.6 Filter mats
The entire cooling unit condenser is covered with a dirt-
repelling, easy-to-clean RiNano coating. In many appli-
cations, 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.
For air containing oil condensate, we recommend the
use of metal filters (also available as an accessory).
These may be cleaned with suitable detergents and re-
used.
Function of the filter mat monitor (with e-Comfort con-
troller only):
Dirt on the filter mat is automatically determined by
measuring the temperature difference in the external cir-
cuit of the cooling unit. As the level of filter mat soiling in-
creases, the temperature difference will increase. The
setpoint value of the temperature difference in the exter-
nal circuit adapts automatically to the relevant operating
points in the performance diagrams. Hence there is no
need to readjust the setpoint value for different unit op-
erating points.
3.2.7 Door limit switch
The cooling unit may be operated with a floating door
limit switch connected. The door limit switch is not in-
cluded with the supply (available as an accessory, Model
No. 4127.010).
The door limit switch function causes the fans and the
compressor in the cooling unit to be switched off after
approximately 15 seconds when the enclosure door is
opened (contacts 1 and 2 closed). This prevents the for-
mation of condensation 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 cuts back in with a delay of approximately 15 sec-
onds after the door has been closed, while the condens-

4 Assembly and connection
EN
6Rittal enclosure cooling unit
er fan and compressor switch on after approximately
3minutes.
3.2.8 Additional interface X3
An additional interface card may be connected to the 9-
pole SUB-D connector X3 in order to incorporate the
cooling unit into higher-level monitoring systems (availa-
ble as an accessory, interface card Model No.
3124.200).
3.3 Proper use, foreseeable misuse
The cooling unit is only intended for cooling connected
enclosures. Any other use is not permitted.
– The unit must not be installed and operated in loca-
tions which are accessible to the general public (see
DIN EN 60335-2-40, paragraph 3.119).
– The unit is designed solely for stationary use.
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.
3.4 Scope of supply
The unit is supplied in a packaging unit in a fully assem-
bled state.
Please check the scope of supply for completeness.
4 Assembly and connection
4.1 Choosing the installation site
When choosing the installation site for the enclosure,
please observe the following:
– The site for the enclosure, and hence the arrangement
of the cooling unit, must be carefully selected so as to
ensure good ventilation (clearance between units and
clearance between the unit and the wall must be at
least 200 mm in each case).
– The cooling unit must be installed and operated in a
vertical position (maximum deviation: 2°).
– The installation site must be free from excessive dirt,
aggressive ambient conditions and moisture.
– The ambient temperature must be within the limits
specified on the rating plate.
– It must be possible to fit a condensate discharge (see
section4.4 "Connecting the condensate discharge").
– The mains connection data as stated on the rating
plate of the unit must be guaranteed.
4.2 Notes on assembly
4.2.1 General
– Check the packaging carefully for signs of damage.
Traces of oil on damaged packaging are an indication
of refrigerant loss and leakages. Any packaging dam-
age may be the cause of a subsequent functional fail-
ure.
– The enclosure must be sealed on all sides (IP 54). In-
creased condensation will occur if the enclosure is not
airtight.
– In order to avoid excessive condensation inside the
enclosure, we recommend installing a door limit
switch (e.g. 4127.010) which deactivates the cooling
unit when the enclosure door is opened (see sec-
tion3.2.7 "Door limit switch").
Note:
– No external voltage may be applied to the
door contacts (terminals 1 and 2).
– For cooling units with basic control, the
evaporator fan continues to run even
when the door is open.
Note:
The electrical signals at the interface are of
an extra-low voltage (not extra-low safety
voltages to EN 60 335).
Qty. Description
1 Enclosure cooling unit
1
1
1
1
4 – 10
Dispatch bag:
– Assembly and operating instructions
–Self-adhesivetape
– Connector X1
–Grubscrews
– Nuts, washers
1 Drilling template
Tab. 1: Scope of supply

Rittal enclosure cooling unit 7
4 Assembly and connection
EN
4.2.2 Layout of the electronic components in the
enclosure
Fig. 4: Never direct the cold airflow at active components
Air diversion components are available as accessories –
please refer to the Rittal Catalogue.
It is important to ensure even air circulation inside the en-
closure. Under no circumstances should air inlet and
outlet openings be obstructed, otherwise the cooling
performance of the unit will be reduced. Ensure the dis-
tance "x" (see fig. 5) from components and other in-
stalled enclosures so that the required air circulation is
not obstructed and prevented.
Fig. 5: Air circulation inside the enclosure
4.3 Fitting the cooling unit
The enclosure cooling unit may optionally be externally
mounted on the enclosure (1), partially internally mount-
ed (2) or fully internally mounted (3):
Fig. 6: Installation method
To this end, cut the side panel or door of the enclosure
as per the drilling template included with the supply, and
drill the relevant holes.
Note:
Risk of condensation!
When arranging the electronic components
inside the enclosure, please ensure that the
cold airflow from the cooling unit is not di-
rected at active components. Please also
ensure that the cold airflow is not directed at
the warm exhaust airflow from active com-
ponents such as converters. This may lead
to an air short-circuit and therefore prevent
adequate climate control, or may even
cause the cooling unit’s internal safety de-
vices to cease cooling operation.
Note:
Units of type 3302.xxx and 3366.xxx can
only be either externally mounted or fully in-
ternally mounted.
Units of type 3332.xxx can only be either ex-
ternally mounted or partially internally
mounted; they cannot be mounted in locka-
ble doors on 600/1200 wide TS enclosures.
To mount units 3328.xxx, 3329.xxx and
3332.xxx in the TS side or rear panel, we
recommend using enclosure panel fasten-
ers 8800.071 (see Rittal Catalogue). For
high dynamic loads and mounting on the
enclosure door, we recommend using rein-
forced door hinges 8800.710 (see Rittal
Catalogue). Units with protection category
NEMA 4X are only suitable for external
mounting.
x
123

4 Assembly and connection
EN
8Rittal enclosure cooling unit
4.3.1 Making the cut-outs
Affix the supplied drilling template to the side panel or
door of the enclosure using adhesive tape.
There are dimensioning lines on the drilling template to
suit the various installation options for your cooling unit.
Using the dimension drawings (see Appendix), identify
the valid lines and dimensions for your installation type
on the drilling template.
Mark, drill and deburr the holes.
Make the cut-outs including the line width as per the
drilling template.
Deburr the cut-outs.
4.3.2 External mounting of the cooling unit
Cut the supplied sealing tape to the correct length and
stick it carefully along the back of the unit so that no
gaps are left at the joints.
Fig. 7: Applying the self-adhesive tape
Screw the supplied grub screws into the blind nuts on
the rear of the unit.
Secure the unit using the supplied washers and nuts.
Fig. 8: Securing the cooling unit (all models except 3302.1xx)
Fig. 9: Securing the cooling unit (3302.1xx only "external
mounting")
4.3.3 Partial internal mounting of the cooling unit
Carefully remove the louvred grille and, where applica-
ble, the infill panel, from the enclosure by pulling for-
wards.
Carefully disconnect the connector from the rear of the
display and gently push it inwards through the cable
gland.
Fig. 10: Removing the louvred grille & disconnecting the display
Loosen the four nuts on the front half of the enclosure
and pull the enclosure forwards by approx. 5 cm.
Loosen the flat-pin connectors of the PE conductor
between the two enclosure halves.
Disconnect the fan connection.
Remove the front enclosure tray completely.
Caution!
Carefully deburr all drilled holes and
cut-outs to prevent injuries caused by
sharp edges.
Caution!
Stability of the cooling unit is only guar-
anteed in its assembled state. Brace
the rear half of the enclosure to prevent
it from falling over before removing the
front half.

Rittal enclosure cooling unit 9
4 Assembly and connection
EN
Fig. 11: Removing the cover
Remove the four spacer bolts.
Cut the supplied sealing tape to the correct length and
stick it carefully along the inside of the rear enclosure
half so that no gaps are left at the connection points.
Fig. 12: Applying the self-adhesive tape
Push the rear enclosure half into the mounting cut-out
and secure it with the four spacer bolts.
Push the display cable through the cable gland of the
front enclosure half.
Fig. 13: Securing the cooling unit
Connect the fan connector and PE conductor.
Mount the front enclosure tray using the washers and
nuts.
Fig. 14: Connecting the display connector
Carefully connect the display connector.
Push the louvred grille and, where applicable, the infill
panel, onto the enclosure.
4.3.4 Full internal mounting of the cooling unit
Carefully remove the louvred grille and the infill panel
from the enclosure by pulling forwards.
Carefully disconnect the connector from the rear of the
display.

4 Assembly and connection
EN
10 Rittal enclosure cooling unit
Fig. 15: Removing the louvred grille & disconnecting the display
Cut the supplied sealing tape to the correct length and
stick it carefully along the front enclosure half so that
no gaps are left at the connection points.
Fig. 16: Applying the self-adhesive tape
Loosen the four nuts and washers from the front en-
closure half.
Push the unit into the mounting cut-out from the inside
of the enclosure, and secure it to the enclosure from
the outside using the washers and nuts.
Only for 3302.xxx:
Before installing, remove the four screws as shown.
Fig. 17: 3302.xxx only: removing the four screws
Fig. 18: Securing the cooling unit
Where necessary, additionally secure the unit using
the supplied mounting plates as shown in fig. 18.
Carefully connect the display connector.
Push the louvred grille and, where applicable, the infill
panel, onto the enclosure.
4.4 Connecting the condensate discharge
A condensate discharge hose can be fitted to all types
of cooling unit (except NEMA 4X devices).
The condensate discharge
– must be laid with a suitable and constant gradient (no
siphoning)
– must be laid without kinks
– must not have a reduced cross-section if extended
The condensate hose is available as an accessory (refer
also to Accessories in the Rittal Catalogue).
Note:
The tightening torque for the nuts is 6 Nm.
4x

Rittal enclosure cooling unit 11
4 Assembly and connection
EN
Fig. 19: Connecting the condensate discharge
Connect a suitable hose to the condensate nozzle and
secure using a hose clip.
Route the condensate hose to a drain or into the ex-
ternal condensate evaporator (refer to Accessories in
the Rittal Catalogue).
4.5 Notes on electrical installation
When performing the electrical installation, it is important
to observe all valid national and regional regulations as
well as the provisions of the responsible power supply
company. The electrical installation may only be carried
out by a qualified electrician who is responsible for com-
pliance with the applicable standards and regulations.
4.5.1 Connection data
– The connected voltage and frequency must corre-
spond to the values stated on the rating plate
– The cooling unit must be connected to the mains via
an all-pin isolating device, which ensures at least
3 mm contact opening when switched off
– No additional temperature control may be connected
upstream of the unit at the supply end
– Install the protective device specified on the rating
plate to protect the line and equipment from short-cir-
cuits.
– The mains connection must ensure low-noise poten-
tial equalisation
4.5.2 Overvoltage protection and supply line load
– The unit does not have its own overvoltage protection.
Measures must be taken by the operator at the supply
end to ensure effective lightning and overvoltage pro-
tection. The mains voltage must not exceed a toler-
ance of ±10%.
– In accordance with IEC 61 000-3-11, the unit is in-
tended solely for use at sites with a continuous cur-
rent-carrying capacity (incoming mains power supply)
of more than 100 A per phase and with a supply volt-
age of 400/230 V. If necessary, the electricity supply
company must be consulted to ensure that the contin-
uous current-carrying capacity at the point of connec-
tion to the public grid is sufficient for connection of
such a unit.
– The fans and compressors in single- and three-phase
units are intrinsically safe (thermal winding protection).
This also applies to transformer versions, types
3304.510, 3305.510, 3328.510 and 3329.510, and to
special-voltage units which are likewise equipped with
a transformer.
– Install the protective device specified on the rating
plate to protect the line and equipment from short-cir-
cuits (miniature circuit-breaker with appropriate char-
acteristic – e.g. "K" characteristic – or gG standard
type slow fuse, circuit-breaker for plant or transformer
protection). Select a suitable circuit-breaker in accord-
ance with the information specified on the rating plate:
Set it to the minimum specified value. This will achieve
the best short-circuit protection for cables and equip-
ment. Example: Specified setting range 6.3 – 10 A; set
to 6.3 A.
4.5.3 Three-phase devices
– The electrical connection for devices in the three-
phase version MUST be made with a clockwise rotat-
ing field
– The three-phase version of models 3304.xxx,
3305.xxx, 3328.xxx, 3329.xxx and 3332.xxx must be
connected to a TN network with star earthing via a cir-
cuit-breaker for plant protection (current setting as per
the rating plate). Three-phase units with special volt-
ages must be protected with a circuit-breaker for
transformer protection (category AC-3) as per the rat-
ing plate.
– Units designed for three phase 400/460 V feature ad-
ditional monitoring of the rotary field or the absence of
a phase. If the rotary field is incorrect or a phase is ab-
sent, the unit will not run.
4.5.4 Door limit switch
– Each door limit switch must only be assigned to one
cooling unit.
– Several door limit switches may be connected in par-
allel to one cooling unit.
– The minimum cross-section for the connection cable
is 0.3 mm2for a cable length of 2 m.
– The line resistance to the door limit switch must not
exceed a maximum of 50 .
– 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.
30 mA DC.
Connect the door limit switch to terminals 1 and 2 of
the connector.
4.5.5 Notes on the flicker standard
The flicker limits specified in standard EN 61 000-3-3 or
-3-11 are adhered to, provided the supply impedance is
less than approx. 1.5 .
Where necessary, the unit operator should measure the
connected impedance or consult the responsible elec-
tricity supply company. If there is no way of influencing

4 Assembly and connection
EN
12 Rittal enclosure cooling unit
the supply impedance and sensitive installed compo-
nents (e.g. BUS) are subjected to interference, a line re-
actor or starting-current limiting device should be con-
nected upstream of the cooling unit to restrict the start-
up current of the cooling unit.
4.5.6 Potential equalisation
If, for EMC reasons, the unit is to be integrated into the
customer’s existing potential equalisation system, a
conductor with a larger nominal cross-section can be
connected to the potential equalisation connection point
(attachment points) on the wall-mounted cooling units.
According to the standard, the PE conductor in the
mains connection cable is not classified as an equipo-
tential bonding conductor.
4.6 Making the electrical connection
4.6.1 Bus connection
(only when interconnecting several units
with a Comfort controller)
When using several cooling units, the serial device inter-
face X2 can be used to connect up to ten cooling units
with the bus cable (Model No. 3124.100).
When interconnecting, please note the following:
– De-energise the cooling units to be connected
– Ensure proper electrical insulation
– Make sure the cables are not laid in parallel to power
lines
– Make sure that the lines are short
4.6.2 Connection X3 for serial interface
The interface card (Model No. 3124.200) may be con-
nected to X3. This is used to evaluate system messages
in a PLC, for remotely setting parameters and monitor-
ing, or for integration into the facility management sys-
tem.
4.6.3 Mounting external transformer
Only for 3361.x40.
Fig. 20: Mounting external transformer (3361.x40 only)
Note:
The electrical signals at the X2 interface are
of an extra-low voltage (not extra-low safety
voltages in accordance with EN 60 335-1).
Note:
With the last slave unit in the group, do not,
under any circumstances, connect the re-
maining socket of the Y cable 3124.100 into
interface X3 of the cooling unit!
Mounting device
rear panel
Fastening to 35 mm
support rail
DIN EN 50 022
Mains connection for
Cooling unit
Customer-side
connection
230 V

Rittal enclosure cooling unit 13
4 Assembly and connection
EN
Fig. 21: Connection example: Master-slave operation
Key
1 Serial interface (Model No. 3124.200)
2 Serial interface cable
3 Master-slave bus cable (Model No. 3124.100)
RTT Rittal TopTherm cooling units
X1 Supply connection/door limit switch/alarms
X2 Master/slave connection Sub-D, 9-pole
X3 Serial interface Sub-D, 9-pole
St. Sub-D connector, 9-pole
Bu. Sub-D jack, 9-pole
Adr. Address
Fig. 22: Connection example: Door limit switch and master-slave operation
Key
1 Master cooling unit
2 Slave cooling units
3 2-door enclosure with two door limit switches
4 Enclosure with door limit switch
4.6.4 Installing the power supply
Complete the electrical installation by following the
wiring plan on the rear of the cooling unit (see fig. 2, for
key see page 15).
If you would like the system messages from the cool-
ing unit to be evaluated via the system message relay,
you should also connect a suitable low-voltage cable
to terminals 3 – 5.
X2
CMC
I/O unit
RTT
Master
Adr.: 09
X1
X2 X3
X1
X2 X3
X1
X2 X3
X1
X2 X3
X2 X3 X2
X2
X2 X2
X2
X2
St. St. St.
Bu.
St.
Bu.
X2
Adr.: 11 Adr.: 12RTT
Slave
RTT
Slave
Adr.: 19RTT
Slave
St.
Bu.
St.
Bu.
3
2
1
X10
L1
L2
N
PE
12345
1
X10 X10 X10 X10 X10
X2 X2 X2 X2 X2 X2
X2
L1
PE
12345
L1
L2
N
PE
12345
L2 L3 L1
PE
12345 L2 L3 L1
PE
12345 L2 L3 L1
PE
12345 L2 L3
L1
L2 N
PE
12345
X10
23456
1
Adr.: 06 Adr.: 11 Adr.: 12 Adr.: 13 Adr.: 14 Adr.: 15
22 2 2 2
34432
Adr.: 16

4 Assembly and connection
EN
14 Rittal enclosure cooling unit
Fig. 23: Electrical wiring plan no. 1
Fig. 24: Electrical wiring plan no. 2
3302.100/.110, 3302.300/.310
3303.500/.510, 3303.600/.610, 3361.500/.510, 3361.600/.610, 3361.540/.640
3304.500/.510/.504/.514/.520/.600/.610
3305.500/.510/.504/.514/.520, 3328.500/.510/.504/.514/.520, 3329.500/.510/.504/.514/.520,
3305.600/.610, 3328.600/.610, 3329.600/.610, 3366.500/.510/.600/.610

Rittal enclosure cooling unit 15
4 Assembly and connection
EN
Fig. 25: Electrical wiring plan no. 3
Key
X1 Main terminal strip
X2 Master/slave connection
X3 Optional interface
K1 Relay collective fault 1
K2 Relay collective fault 2
Door Door limit switch (without door limit switch: terminal 1, 2
open)
4.7 Finalising assembly
4.7.1 Installing the filter media
The entire cooling unit condenser is covered with a dirt-
repelling, easy-to-clean RiNano coating. In many appli-
cations, 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. For air contain-
ing oil condensate, we recommend the use of metal fil-
ters (also available as an accessory). When used in
textile plants with heavy lint contamination, lint screens
should be used (available as an optional extra).
Pull the louvred air inlet grille off the enclosure.
Insert the filter mat into the louvred grille as shown in
fig. 26 and push it back onto the enclosure.
Fig. 26: Installing the filter mat
4.7.2 Fitting the cooling unit
For partial and full internal mounting only.
Connect the connector to the rear of the display.
Place the louvred grille onto the unit at the front, and
press it down until you hear it snap into place.
3304.540/.544, 3305.540/.544, 3328.540/.544, 3329.540/.544
3304.640, 3305.640, 3328.640, 3329.640, 3366.540/.640, 3332.540/.640
Note:
For technical data, refer to the rating plate.
AC
cos φ = 1
DC
Res. Load
I max. = 2 A
U max. = 250 V
I min. = 100 mA
U max. = 30 V
I max. = 2 A
Tab. 2: Relay contact data

5 Start-up
EN
16 Rittal enclosure cooling unit
Fig. 27: Connect the display and attach the louvred grille
4.7.3 Setting the filter mat monitor
(only with e-Comfort controller)
Function of the filter mat monitor:
Dirt on the filter mat is automatically detected by meas-
uring the temperature difference in the external circuit of
the cooling unit (see section6.2.6 "Programming over-
view"). As the level of filter mat soiling increases, the
temperature difference will increase. The setpoint value
of the temperature difference in the external circuit
adapts automatically to the relevant operating points in
the performance diagrams. Hence there is no need to
readjust the setpoint value for different unit operating
points.
5 Start-up
Once all the assembly and installation work is com-
plete, switch on the power supply to the cooling unit.
The cooling unit starts running:
– With Basic controller: The green operating LED ("line")
is illuminated.
– With e-Comfort controller: The software version of the
controller first appears for approx. 2 seconds, then
"ECO" to show Eco mode is enabled. The internal en-
closure temperature will then appear in the 7-segment
display
You can now make your individual settings on the unit,
e.g. set the temperature or (with e-Comfort controller
only) assign the network identifier, etc. (refer to section6
"Operation").
6 Operation
You can operate the cooling unit using the controller on
the front of the device (fig. 2, item 11). Depending on the
model, the unit is equipped with a Basic or e-Comfort
controller.
6.1 Control using the Basic controller
For Model Nos. 3302.xxx.
Fig. 28: Basic controller
Key
1 Controller trim panel
2 Temperature setter
3 LED green ("line")
4 LED red ("alarm")
5 Reset button
6.1.1 Properties
– Rated operating voltage: 115 V or 230 V
– Integral start-up delay and door limit switch function
– Protective function to prevent icing
– Monitoring of all motors (compressor, condenser fan,
evaporator fan)
– Phase monitoring for three-phase units
– Visualisation of the operating status via LED display:
– Voltage on, unit operational
– Door open (only if door limit switch installed)
– Warning of overtemperature
– High-pressure monitor has switched
– Switching hysteresis: 5 K
If the cooling unit and compressor run times are too
long < 1 minute, the switching hysteresis to protect
the cooling unit is automatically increased.
– Floating system message contact in case of overtem-
perature
Note:
The oil must be collected in the compressor
in order to ensure effective lubrication and
cooling.
Do not operate the cooling unit for at least
30 minutes after assembling the equipment.
34
1
2
5

Rittal enclosure cooling unit 17
6 Operation
EN
– Temperature setting
(setting range 30 – 55°C) via potentiometer
– Test function
– Flashing mode to indicate system messages.
See section6.1.2 "Operating and error display"
The cooling unit operates automatically, i.e. after switch-
ing on the power supply, the evaporator fan (see fig. 3)
will run continuously and permanently circulate the inter-
nal enclosure air. The built-in Basic controller ensures
automatic normal shut-down operation of the cooling
unit by the value of the fixed preset switching difference
of 5 K.
6.1.2 Operating and error display
The Basic controller monitors and controls the cooling
unit. It indicates the operating and error status via the
green and red LEDs (fig. 28, items 3 and 4):
Key to flash intervals
| = 500 ms (red LED on)
_ = 500 ms (red LED off)
***** = 3 s pause (red LED off)
The overtemperature message may also be polled via an
integral floating contact on the cooling unit terminal (sys-
tem message relay with changeover contact, see con-
nection diagrams under section4.6.4 "Installing the
power supply"):
– Terminal 3: NC (normally closed)
– Terminal 4: C (connection of the supply voltage to the
fault signal relay)
– Terminal 5: NO (normally open)
The NC and NO definitions refer to the de-energised
state. As soon as power is applied to the cooling unit,
LED Status Cause Solution
Green
(line)
Illuminated Power supply on,
unit operational
–
Flashing Only with door limit switch installed:
enclosure door open
In order to avoid condensation, close the enclo-
sure door as quickly as possible.
Only with door limit switch installed:
enclosure door closed
Check the position of the door limit switch.
Red
(alarm)
Alarm/error/warning Number of flash
intervals for the
red LED
Flash interval
Implement
a
reset
Device reset (12) |_|_|_|_|_|_|_|_|_|_|_|*****|_|_|_|_|_|_|_|_|_|_|_|
High pressure alarm (0) |_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|
Sensors Potentiometer defective or
display error
(3) |_|_|*****|_|_|*****|_|_|*****|_|_|*****|_|_|*****
Internal temperature
sensor defective
(4) |_|_|_|*****|_|_|_|*****|_|_|_|*****|_|_|_|*****
Anti-icing sensor defective (5) |_|_|_|_|*****|_|_|_|_|*****|_|_|_|_|*****|_|_|_|_|
Overload Compressor overloaded (6) |_|_|_|_|_|*****|_|_|_|_|_|*****|_|_|_|_|_|*****
Interior fan overloaded (7) |_|_|_|_|_|_|*****|_|_|_|_|_|_|*****|_|_|_|_|_|_|
Exterior fan overloaded (8) |_|_|_|_|_|_|_|*****|_|_|_|_|_|_|_|*****
Device sta-
tus/state
Overload mode
(heat loss)
(9) |_|_|_|_|_|_|_|_|*****|_|_|_|_|_|_|_|_|*****
Warning Anti-icing alarm (2) |_|*****|_|*****|_|*****|_|*****|_|*****|_|*****|_|
Overtemperature warning (1) |*****|*****|*****|*****|*****|*****|*****|*****|*****|
Off No display No power – Check power supply
Rotary current phase moni-
toring:
"LED off" = Incorrect
phase connection
– Swap phases
Tab. 3: Operating and error display on the Basic controller

6 Operation
EN
18 Rittal enclosure cooling unit
the system message relay picks up, so that the relay
contacts change status (contact 3 – 4 open; contact 4 –
5 closed).
This is the normal operating state of the cooling unit. As
soon as an error message occurs or the power supply is
interrupted, the relay drops out and contact 3 – 4 is
closed.
6.1.3 Test mode with the Basic controller
The Basic controller is equipped with a test function
whereby the cooling unit commences cooling operation
independently of the set temperature or door limit switch
function.
First you must remove the controller trim panel.
Switch off the mains voltage.
Remove the louvred grille or infill panel in which the
controller is installed.
Release the display lock from behind and pull it for-
wards slightly.
Fig. 29: Releasing the Basic controller trim panel
Carefully lift the trim panel, e.g. using your thumb or a
flat screwdriver, and remove it.
You can now start test mode.
Rotate the potentiometer to the left-hand stop, then
hold the rubberised potentiometer display down while
you re-connect the mains voltage.
The cooling unit will commence operation and the green
LED will flash (I_II_I_II_ . . .). Test mode is completed after
approximately 5 minutes. The unit switches off and
changes to normal operation.
Key
I = LED 500 ms on
_ = LED 500 ms off
In normal operation, the green LED is permanently illumi-
nated.
Next, rotate the potentiometer back to the required
setpoint.
6.1.4 Setting the temperature
To change the temperature setting:
Take the trim panel off the controller as described in
section6.1.3 "Test mode with the Basic controller".
Set the required temperature on the temperature set-
ting device (fig. 28).
Carefully push the trim panel onto the display until you
hear it snap into place.
Push the display back into the infill panel or louvred
grille.
Re-attach the louvred grille or infill panel to the cooling
unit.
6.1.5 Resetting the Basic controller
Following a high-pressure alarm in the cooling cycle, and
once the cause has been rectified, you will need to man-
ually reset the Basic controller:
Take the trim panel off the Basic controller as de-
scribed in section6.1.3 "Test mode with the Basic
controller".
Press the reset button (fig. 28, item 5) for at least
3seconds.
The red LED is extinguished.
Re-install the Basic controller.
6.2 Control using the e-Comfort controller
For unit types 33xx.5xx and 33xx.6xx.
Fig. 30: e-Comfort controller
Key
1 Programming button, also display of the set temperature
unit (degrees Celsius)
2 Set button
3 Programming button, also display of the set temperature
unit (degrees Fahrenheit)
47-segmentdisplay
Note:
With the Basic controller, the temperature is
preset at the factory to +35°C.
In order to save energy, do not set the tem-
perature lower than that actually necessary.
12
43

Rittal enclosure cooling unit 19
6 Operation
EN
6.2.1 Properties
– Rated operating voltage:
–115Vor
–230Vor
– 400/460 V, 3-phase, supports multiple voltages
without rewiring
– Integral start-up delay and door limit switch function
– Protective function to prevent icing
– Monitoring of all motors (compressor, condenser fan,
evaporator fan)
– Phase monitoring for three-phase units
– Master-slave function with a maximum of ten units.
One device functions as a master unit. Once the set
temperature is reached by one of the connected slave
devices or in the event of the door limit switch function,
the affected slave unit will report to the master unit that
switches all the other cooling units on or off as re-
quired.
– Switching hysteresis: adjustable from 2 – 10 K, preset
to 5 K
– Visualisation of the current internal enclosure temper-
ature and all error messages in the 7-segment display
– Using an interface card (Model No. 3124.200), the unit
may be incorporated into higher-level remote monitor-
ing systems.
The cooling unit operates automatically, i.e. after switch-
ing on the power supply, the evaporator fan (see fig. 3)
will run and circulate the internal enclosure air. The com-
pressor and condenser fan are regulated by the e-Com-
fort controller. The e-Comfort controller has a 7-seg-
ment display (fig. 30, item 4). After switching on the pow-
er supply, the current software version initially appears
on this display for approx. 2 seconds together with the
symbol to show Eco mode is enabled, followed by a pre-
set option (e.g. t10) or the temperature.
In regular operation, the display shows both the temper-
ature (in degrees Celsius or Fahrenheit – users may
switch between the two) and any error messages.
The current internal enclosure temperature is usually dis-
played permanently. In the event of an error message,
this alternates with the temperature display.
The unit is programmed using buttons 1 – 3 (fig. 30). The
relevant parameters also appear in the display.
6.2.2 Eco mode
All Rittal TopTherm cooling units with e-Comfort control-
ler from firmware 3.2 have the energy-saving eco mode,
which is enabled in the delivered state.
The eco mode is used to save energy in the heat ex-
changer if there is no thermal load, or there is a low ther-
mal load in the enclosure (e. g. standby operation, no
production or weekend). During this process the evapo-
rator fan in the internal circuit is switched off as appro-
priate if the actual internal enclosure temperature drops
to 10 K below the specified setpoint temperature. To en-
sure the internal temperature is reliably measured during
this process, the fan starts cyclically for 30 sec. every 10
minutes (see fig. 31). If the internal temperature drops to
a range 5 K below the setpoint set again, the fan switch-
es back to continuous operation.
If required, eco mode can be disabled on the control dis-
play. For this purpose switch the parameter from 1 to 0
in the programming level (see tab.4). The fan then runs
continuously.
Fig. 31: Eco mode
6.2.3 Launching test mode
The e-Comfort controller is equipped with a test function
whereby the cooling unit commences cooling operation
independently of the set temperature or door limit switch
function.
Simultaneously press buttons 1 and 2 (fig. 30) for at
least 5 sec.
The cooling unit will commence operation. Test mode is
completed after approximately 5 minutes. The unit
switches off and changes to normal operation.
ON
Status
internal fan
Internal
temperature
Time
Setpoint
-5°C
Setpoint
-10°C
OFF
10 min.
30 sec.
10 min.

6 Operation
EN
20 Rittal enclosure cooling unit
6.2.4 General information about programming
Using buttons 1, 2 and 3 (fig. 30) you can change
24 parameters within the preset ranges (min. value,
max. value).
Tables 4 and 5 show the parameters which can be al-
tered. fig. 32 on page 22 shows which buttons must be
pressed.
In principle, the programming is identical for all editable
parameters.
To enter programming mode:
Press button 2 ("Set") for approx. 5 seconds.
The controller is now in programming mode. While in
programming mode, if you do not press any buttons for
approx. 30 seconds, the display will first flash, then the
controller will switch back to normal display mode. "Esc"
in the display indicates that any changes made have not
been saved.
Press the programming buttons (°C) or (°F) to
switch between the editable parameters (see tables 4
and 5).
Press button 2 ("Set") to select the displayed parame-
ter for editing.
The current value of this parameter is displayed.
Press one of the programming buttons (°C) or
(°F).
"Cod" will appear in the display. In order to be able to
change a value, you must enter the authorisation code
"22".
Keep the programming button (°C) held down until
"22" appears.
Press button 2 ("Set") to confirm the code.
You can now alter the parameter within the preset limits.
Press one of the programming buttons (°C) or
(°F) until the required value appears.
Press button 2 ("Set") to confirm the change.
You can now alter other parameters in the same way.
There is no need to re-enter the authorisation code "22".
To exit programming mode, press button 2 ("Set")
again for approximately 5 seconds.
"Acc" will appear in the display to indicate that the
changes have been saved. The display then switches
back to regular operation (internal enclosure tempera-
ture).
You can also program the e-Comfort controller using a
diagnosis software package (Model No. 3159.100),
which is supplied with a connection cable to the PC. The
cable connector on the rear of the e-Comfort controller
display serves as an interface.
Note on switching hysteresis:
With a low hysteresis and short switching
cycles, there is a risk that cooling may not
be adequate or that only partial sections of
the enclosure are cooled. If the cooling unit
and compressor run times are too long
< 1 minute, the switching hysteresis to pro-
tect the cooling unit is automatically in-
creased (see message "LH" in section
6.2.9 "Evaluating system messages").
Note on temperature settings:
With the e-Comfort controller, the tempera-
ture is preset at the factory to +35°C.
In order to save energy, and due to the risk
of increased condensation, do not set the
temperature lower than that actually neces-
sary.
Note on useful cooling power:
Interactive performance diagrams for calcu-
lating the useful cooling power may be
found at www.rittal.com.