03_innen_engl_sk_3302 Installation Directions

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Schaltschrank-Kühlgerät

Cooling unit

Climatiseur

Koelaggregat

Kylaggregat

Condizionatori per armadi

di comando

Refrigerador para armarios

SK 3302.xxx

SK 3302.3xx

SK 3303.xxx

SK 3304.xxx

SK 3305.xxx

SK 3328.xxx

SK 3329.xxx

SK 3332.xxx

SK 3361.xxx

SK 3366.xxx

Montage-, Installations- und Bedienungsanleitung

Assembly and operating instructions

Manuel d’installation et de maintenance

Montage- en bedieningshandleiding

Montage- och hanteringsanvisning

Istruzioni di montaggio e funzionamento

Instrucciones de montaje

Rittal cooling unit assembly and operating instructions 3

Contents

1 Notes on documentation. . . . . . . . . . 4

1.1 Associated documents. . . . . . . . . . . . . . . . 4

1.2 CE labelling . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.3 Retention of documents. . . . . . . . . . . . . . . 4

1.4 Symbols used . . . . . . . . . . . . . . . . . . . . . . . 4

2 Safety instructions. . . . . . . . . . . . . . . 4

3 Device description . . . . . . . . . . . . . . . 5

3.1 Functional description . . . . . . . . . . . . . . . . 5

3.1.1 How it works . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.1.2 Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.1.3 Bus mode (e-Comfort controller only). . . . . . 5

3.1.4 Safety equipment . . . . . . . . . . . . . . . . . . . . . 6

3.1.5 Condensation . . . . . . . . . . . . . . . . . . . . . . . . 6

3.1.6 Filter mats . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.1.7 Door limit switch . . . . . . . . . . . . . . . . . . . . . . 6

3.1.8 Additional interface X3 . . . . . . . . . . . . . . . . . 7

3.2 Proper usage . . . . . . . . . . . . . . . . . . . . . . . . 7

3.3 Scope of supply . . . . . . . . . . . . . . . . . . . . . 7

4 Assembly and connection . . . . . . . . 7

4.1 Choosing the installation site . . . . . . . . . . 7

4.2 Assembly instructions . . . . . . . . . . . . . . . . 7

4.2.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4.2.2 Layout of the electronic components

in the enclosure . . . . . . . . . . . . . . . . . . . . . . 8

4.3 Fitting the cooling unit . . . . . . . . . . . . . . . . 8

4.3.1 Cutting out on the enclosure. . . . . . . . . . . . . 9

4.3.2 External mounting of the cooling unit . . . . . . 9

4.3.3 Partial internal mounting

of the cooling unit . . . . . . . . . . . . . . . . . . . . . 9

4.3.4 Full internal mounting of the cooling unit . . 11

4.4 Connecting the condensate discharge. . 12

4.5 Notes on electrical installation . . . . . . . . 12

4.5.1 Connection data . . . . . . . . . . . . . . . . . . . . . 12

4.5.2

Overvoltage protection

and supply line load

. . . . . . . . . . . . . . . . . . 12

4.5.3 Three-phase devices . . . . . . . . . . . . . . . . . 12

4.5.4 Door limit switch . . . . . . . . . . . . . . . . . . . . . 13

4.5.5 Notes on the flicker standard . . . . . . . . . . . 13

4.5.6 Potential equalisation . . . . . . . . . . . . . . . . . 13

4.6 Carrying out the electrical installation . . 13

4.6.1 Bus connection

(only in conjunction with several units with

an e-Comfort controller) . . . . . . . . . . . . . . . 13

4.6.2 Connection X3 for serial interface. . . . . . . . 13

4.6.3 Installing external transformers. . . . . . . . . . 13

4.6.4 Installing the power supply. . . . . . . . . . . . . 14

4.7 Finalising assembly . . . . . . . . . . . . . . . . . 20

4.7.1 Installing the filter media . . . . . . . . . . . . . . 20

4.7.2 Fitting the cooling unit. . . . . . . . . . . . . . . . . 20

4.7.3 Setting the filter mat monitor

(only with e-Comfort controller). . . . . . . . . . 20

5 Commissioning . . . . . . . . . . . . . . . . 20

6 Operation . . . . . . . . . . . . . . . . . . . . . 21

6.1 Control using the Basic controller . . . . . 21

6.1.1 Properties. . . . . . . . . . . . . . . . . . . . . . . . . . 21

6.1.2 Operating and error display. . . . . . . . . . . . 22

6.1.3 Test mode for the Basic controller . . . . . . . 23

6.1.4 Setting the temperature . . . . . . . . . . . . . . . 23

6.1.5 Resetting the Basic controller . . . . . . . . . . 23

6.2 Control using the e-Comfort controller . 23

6.2.1 Properties. . . . . . . . . . . . . . . . . . . . . . . . . . 23

6.2.2 Eco-mode. . . . . . . . . . . . . . . . . . . . . . . . . . 24

6.2.3 Launching test mode . . . . . . . . . . . . . . . . . 24

6.2.4 General programming information. . . . . . . 24

6.2.5 Editable parameters. . . . . . . . . . . . . . . . . . 25

6.2.6 Programming overview . . . . . . . . . . . . . . . 26

6.2.7 Defining system messages

for evaluation . . . . . . . . . . . . . . . . . . . . . . . 27

6.2.8 Setting the master-slave identifier . . . . . . . 28

6.2.9 Evaluating system messages. . . . . . . . . . . 28

6.2.10 Resetting the e-Comfort controller . . . . . . . 30

7 Inspection and maintenance. . . . . . 30

7.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

7.1.1 Compressed air cleaning

SK 3304.xxx, SK 3305.xxx . . . . . . . . . . . . . 30

7.1.2 Compressed air cleaning

SK 3328.xxx, SK 3329.xxx, SK 3332.xxx . . 34

8 Storage and disposal. . . . . . . . . . . . 39

9 Technical specifications . . . . . . . . . 39

10 List of spare parts . . . . . . . . . . . . . . 43

11 Appendix:

Cut-out and hole sizes

. . . . . . . . . . . 47

11.1 Dimensions for external mounting . . . . . 47

11.2 Dimensions for partial

internal mounting. . . . . . . . . . . . . . . . . . . 48

11.3 Dimensions for full internal mounting . . 49

4Rittal cooling unit assembly and operating instructions

1 Notes on documentation

These assembly instructions are aimed at tradesper-

sons who are familiar with assembly and installation

of the cooling unit, and at trained specialists who are

familiar with operation of the cooling unit.

1.1 Associated documents

There are two sets of instructions for the unit types

described here:

– Assembly and installation instructions enclosed

with the unit in the form of a paper document

– Assembly, installation and operating instructions

enclosed with the unit in the form of a PDF file

(Adobe Acrobat) on CD-ROM

We cannot accept any liability for damage associat-

ed with failure to observe these instructions. Where

applicable, the instructions for any accessories used

also apply.

1.2 CE labelling

The declaration of conformity is supplied with the unit

as a separate document.

1.3 Retention of documents

These instructions and all associated documents

constitute an integral part of the product. They must

be given to the plant operator. The plant operator is

responsible for storage of the documents so they are

readily available when needed.

1.4 Symbols used

Please observe the following safety instructions and

other notes in this guide:

Symbol for an instructed action:

• The bullet point indicates that you should perform

an action.

Safety and other instructions:

2 Safety instructions

Please observe the following general safety instruc-

tions when assembling and operating the unit:

– Assembly, installation and servicing may only be

performed by properly trained specialists.

– Screw the enclosure to the floor to prevent it from

tipping 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 also section 4.2.2).

– To ensure problem-free opening and closing of

the enclosure door, use a ride-up door roller (refer

to the accessories 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

enclosure must not exceed the specific useful

cooling output of the cooling unit.

– When transporting the enclosure with the cooling

unit externally mounted, always use an additional

shipping brace to support the cooling unit.

– The cooling unit must always be transported in an

upright position.

– Use only original spare parts and accessories.

– Do not make any changes to the cooling unit other

than those described in these instructions or asso-

ciated instructions.

– Risk of burn injuries! For cooling units with auto-

matic condensate evaporation, the surface of the

thermal element 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-energised. Connect the pre-fuse specified on

the rating plate.

Danger!

Immediate danger to life and limb!

Caution!

Potential threat to the product

and its environment.

Note:

Useful information

and special features.

3 Device description

Rittal cooling unit assembly and operating instructions 5

3 Device description

Depending on the model chosen, your cooling unit

may vary in appearance from the illustrations con-

tained in these instructions. However, the functions

are identical in principle.

Fig. 1: Device description

Legend

1 Blind rivet nut

2 Evaporator fan

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 Functional description

Enclosure cooling units are designed to dissipate

heat from enclosures by cooling the air inside the

enclosure and so protect the temperature-sensitive

components. They are built into the side or rear

panel or into the door of the enclosure.

3.1.1 How it works

The cooling unit (compression refrigeration system)

is comprised of four main components (cf. Fig. 2):

the evaporator (1), the coolant 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. Coolant R134a (CH2FCF3) is chlorine-

free. Its ozone destruction potential is 0, making it

very eco-friendly. A filter 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. 2: Cooling circuit

In the evaporator coil (1), the liquid coolant is con-

verted to a gaseous state. The energy needed for

this purpose 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 coolant is

heavily compressed, so that it achieves a higher

temperature inside the condenser (3) than the ambi-

ent 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 coolant

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

further, and is then once again able to absorb the

energy from the enclosure air in the evaporator coil.

The whole cycle begins again.

3.1.2 Control

Rittal enclosure cooling units are fitted with a con-

troller for setting the functions of the cooling unit.

Depending on the design, this is either a Basic con-

troller (display of the operating status via LED) or a

e-Comfort controller (display plus extended func-

tions, see chapter “6 Operation”, page 21).

3.1.3 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. SK 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”.

PSAH

pressure-

operated

switch Condenser fan

Expansion valve (4)

Temperature

control

Filter dryer (5)

Internal circuit

Compressor

(2)

External circuit

Evaporator fan

Evaporator coil (1)

Condenser (3)

6Rittal cooling unit assembly and operating instructions

3 Device description

3.1.4 Safety equipment

– In the cooling cycle, the cooling unit has a tested

pressure-operated switch to EN 12 263 which is

set to maximum PS (admissible 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

compressor switches itself off and automatically

switches itself back on again at higher tempera-

tures.

– 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 tem-

perature via the door limit switch function or via de-

energising), the device will switch back on with a

delay of 180 seconds.

– 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

(1x change-over contact Basic controller, 2 x nor-

mally open contacts e-Comfort controller).

3.1.5 Condensation

At high levels of humidity and low temperatures in-

side the enclosure, condensation may form on the

evaporator coil.

The cooling units (except SK 3302.xxx, SK 3303.xxx

and SK 3361.xxx) have automatic, electric conden-

sate evaporation. The thermal component used for

this purpose is based on self-regulating PTC tech-

nology. Condensate arising on the evaporator coil

is collected in a tank in the external circuit of the cool-

ing unit, and partially evaporated 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 con-

nected and has no switchpoint. It is protected

against short-circuits with miniature fuses (F1.1,

F1.2). If the fuse has tripped, any condensation is

drained off via the safety overflow.

For unit types SK 3302.xxx, SK 3303.xxx and

SK 3361.xxx, the condensation is routed downwards

out of the unit via a drain pipe on the evaporator coil

divider panel. For this purpose, a hose must be con-

nected to the condensate nozzle (see “4.4 Connect-

ing the condensate drain”, page 12). External con-

densate evaporators are available as accessories

for these unit types (refer also to the accessories in

the Rittal Catalogue).

3.1.6 Filter mats

The cooling unit condenser is finished all over with a

dirt-repelling, easy-to-clean RiNano coating. In many

cases, therefore, the use of filter media is unneces-

sary, particularly in the case of dry dusts.

For dry, coarse dust and lint in the ambient air, we

recommend installing an additional PU foam filter

mat (available as an accessory) in the cooling unit.

Depending on the incidence of dust, you will need

to replace the filter from time to time.

For air containing oil condensation, we recommend

the use of metal filters (also available as an accesso-

ry). These may be cleaned with suitable detergents

and reused.

Function of the filter mat monitor:

Dirt on the filter mat is automatically determined by

measuring the temperature difference in the external

circuit of the cooling unit. As the level of filter mat soil-

ing rises, the temperature difference will increase.

The nominal value of the temperature difference in

the external circuit adapts automatically to the rele-

vant operating points in the performance diagrams.

Hence there is no need to readjust the nominal value

for different operating points of the cooling unit.

3.1.7 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. PS 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 pre-

vents the formation of condensation inside the enclo-

sure 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 de-

lay of approximately 15 seconds after the door has

been closed, while the condenser fan and compres-

sor switch on after approximately 3 minutes.

Note:

– No external voltage must be applied to

the door contacts (terminals 1 and 2).

– For Basic controller cooling units with

230/115 V and 400 V/2-phase connec-

tion, the evaporator fan remains opera-

tional even with the door open.

4 Assembly and connection

Rittal cooling unit assembly and operating instructions 7

3.1.8 Additional interface X3

An additional interface card may be connected to

the 9-pole SUB-D connector X3 in order to incor-

porate the cooling unit into higher-level monitoring

systems (available as an accessory, interface card

Model No. SK 324.200).

3.2 Proper usage

Rittal enclosure cooling units were developed and

designed in accordance with the state-of-the-art and

the recognised rules governing technical safety.

Nevertheless, if used improperly, they may pose a

threat to life and limb or cause damage to property.

The unit is only intended for cooling enclosures. Any

other use is deemed improper. The manufacturer will

not be liable for any damages caused as a result of

improper use, or for incorrect assembly, installation

or use. All risk is borne solely by the user.

Proper usage also includes the observation of all

valid documents and compliance with the inspection

and servicing conditions.

3.3 Scope of supply

The unit is supplied in a packaging unit in a fully

assembled state.

Please check the delivery for completeness:

Tab. 1: Scope of supply

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 arrange-

ment of the cooling unit, must be carefully selected

so as to ensure good ventilation (distances bet-

ween units and distances 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 site must be free from excessive dirt and

moisture.

– The ambient temperature must not exceed 55°C.

– It must be possible to fit a condensate discharge

(see “4.4 Connecting the condensate discharge”,

page 12).

– The mains connection data as stated on the rating

plate of the unit must be guaranteed.

4.2 Assembly instructions

4.2.1 General

– Check the packaging carefully for signs of damage.

Traces of oil on damaged packaging are an indi-

cation of refrigerant loss and leakages. Packaging

damage may be the cause of a subsequent func-

tional failure.

– The enclosure must be sealed on all sides (IP 54).

Increased 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. PS 4127.010) which deactivates

the cooling unit when the enclosure door is opened

(see “3.1.7 Door limit switch”, page 6).

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

4 – 10

Dispatch bag:

– Assembly and installation instructions

– Assembly, installation and operating

instructions on CD-ROM

– Safety instructions

– Self-adhesive tape

– Connector X1

– Self-tapping screws

– Declaration of conformity

– Nuts, washers

1 Drilling template

8Rittal cooling unit assembly and operating instructions

4 Assembly and connection

4.2.2 Layout of the electronic components

in the enclosure

Fig. 3: Never direct the cold airflow at active components

Air diversion components are available as accesso-

ries – please refer to the Rittal catalogue.

It is important to ensure even air circulation inside the

enclosure. Under no circumstances should air inlet

and outlet openings be obstructed, otherwise the

cooling performance of the unit will be reduced.

Ensure the distance “x” (see Fig. 4) from electronic

components and other installed enclosures so that

the required air circulation is not obstructed and pre-

vented.

Fig. 4: Air circulation inside the enclosure

4.3 Fitting the cooling unit

The enclosure cooling unit may optionally be exter-

nally mounted on the enclosure (1), partially internal-

ly mounted (2) or fully internally mounted (3):

Fig. 5: Installation method

To this end, cut the side panel or door of the enclo-

sure as per the drilling template included with the

supply, and drill the relevant holes.

Caution!

Risk of condensation!

When arranging the components inside

the enclosure, please ensure that the

cold airflow from the cooling unit is not

directed at active components. Please

also ensure that the cold airflow is not

directed at the warm exhaust airflow

from active components such as con-

verters. This may lead to an air short-

circuit and therefore prevent adequate

climate control, or may even cause the

cooling unit’s internal safety devices to

cease cooling operation.

Note:

Units of type SK 3302.xxx can only be either

externally mounted or fully internally moun-

ted.

Units of type SK 3332.xxx can only be either

externally mounted or partially internally

mounted.

For mounting the units SK 3328.xxx,

SK 3329.xxx and SK 3332.xxx in the TS side

panel or rear panel, we recommend the use

of enclosure panel fasteners TS 8800.071

(see Rittal Catalogue).

1 2 3

4 Assembly and connection

Rittal cooling unit assembly and operating instructions 9

4.3.1 Cutting out on the enclosure

• Stick the supplied drilling template onto 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. 6: Attach the sealing 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. 7: Secure the cooling unit

(all models except SK 3302.1xx)

Fig. 8: Secure the cooling unit

(SK 3302.1xx “external mounting” only)

4.3.3 Partial internal mounting of the cooling unit

• Carefully remove the louvred grille and, where

applicable, the infill panel, from the enclosure by

pulling forwards.

• Carefully disconnect the connector from the rear of

the display and gently push it inwards through the

cable gland.

Fig. 9: Remove the louvred grille & disconnect the display

• Loosen the four nuts on the front enclosure half 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.

Risk of injury!

Carefully deburr all drilled holes and

cut-outs to prevent injuries caused by

sharp edges.

Risk of damage!

Stability of the cooling unit is only

guaranteed in its assembled state.

Brace the rear enclosure half to prevent

it from falling over before removing the

front enclosure half.

10 Rittal cooling unit assembly and operating instructions

4 Assembly and connection

Fig. 10: Remove 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 con-

nection points.

Fig. 11: Attach the sealing 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. 12: Secure the cooling unit

• Connect the fan connector and PE conductor.

• Mount the front enclosure tray using the washers

and nuts.

Fig. 13: Connect the display connector

• Carefully connect the display connector.

• Push the louvred grille and, where applicable,

the infill panel, onto the enclosure.

4 Assembly and connection

Rittal cooling unit assembly and operating instructions 11

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.

Fig. 14: Remove the louvred grille and disconnect

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. 15: Attach the sealing tape

• Loosen the four nuts and washers from the front

enclosure half.

• Push the unit into the mounting cut-out from the

inside of the enclosure, and secure it to the en-

closure from the outside using the washers and

nuts.

Only for SK 3302.xxx:

• Before installing, remove the four screws as shown.

Fig. 16: Only for SK 3302.xxx: Remove the four screws

Fig. 17: Secure the cooling unit

• Where necessary, additionally secure the unit

using the supplied mounting plates as shown in

Fig. 17.

• Carefully connect the display connector.

• Push the louvred grille and, where applicable,

the infill panel, onto the enclosure.

12 Rittal cooling unit assembly and operating instructions

4 Assembly and connection

4.4 Connecting the condensate discharge

Unit types SK 3302.xxx, SK 3303.xxx and

SK 3361.xxx support the installation of a condensate

discharge hose (Ø 1/2˝).

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).

Fig. 18: Connecting the condensate discharge

• Connect a suitable hose to the condensate nozzle

and secure using a hose clip.

• Lay the condensate hose into a pay-off or into the

external condensate evaporator (refer to accesso-

ries in the Rittal Catalogue).

4.5 Notes on electrical installation

When performing the electrical installation, it is im-

portant to observe all valid national and regional reg-

ulations 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 stand-

ards and regulations.

4.5.1 Connection data

– The connected voltage and frequency must

correspond 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 connec-

ted upstream of the unit at the supply end.

– Install the pre-fuse specified on the rating plate

to protect the cable and equipment from short-

circuits.

– The mains connection must ensure low-noise

potential equalisation.

4.5.2 Overvoltage protection and supply line

load

– The unit does not have its own overvoltage pro-

tection. Measures must be taken by the operator at

the supply end to ensure effective lightning and

overvoltage protection. The mains voltage must

not exceed a tolerance of ±10%.

– In accordance with IEC 61 000-3-11, the unit is

intended solely for use at sites with a continuous

current-carrying capacity (incoming mains power

supply) of more than 100 A per phase and with

a supply voltage of 400/230 V. If necessary, the

power supply company must be consulted to

ensure that the continuous current-carrying capa-

city at the point of connection 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). The same also applies to the transfor-

mer versions of types SK 3304.510, SK 3305.510,

SK 3328.510 and SK 3329.510 and to special-

voltage units which are likewise equipped with a

transformer.

– Install the slow pre-fuse specified on the rating

plate (miniature circuit-breaker with appropriate

characteristic – e. g. K characteristic – or fuse

gG standard type, power circuit-breaker or trans-

former circuit-breaker) to protect the cable and

equipment from short-circuits. Select a suitable

circuit-breaker in accordance 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 equipment.

Example: Specified setting range 6.3 – 10 A;

set to 6.3 A.

4.5.3 Three-phase devices

– The three-phase version of models SK 3304.xxx,

SK 3305.xxx, SK 3328.xxx, SK 3329.xxx and

SK 3332.xxx must be connected to a TN network

with star earthing via a circuit-breaker for plant

protection (current setting as per the rating plate).

Three-phase units with special voltages must be

protected with a circuit-breaker for transformer

protection (category AC-3) as per the rating plate.

– Units designed for three phase 400/460 V feature

additional monitoring of the rotary field or the

absence of a phase. If the rotary field is incorrect

or a phase is absent, the unit will not run.

4 Assembly and connection

Rittal cooling unit assembly and operating instructions 13

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

parallel and operated on one 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 :.

– The door limit switch only supports a floating

connection; 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 im-

pedance is less than approx. 1.5 :.

Where necessary, the unit operator should measure

the connected impedance or consult the responsible

power supply company. If there is no way of influenc-

ing the supply impedance and sensitive installed

components (e.g. BUS) are subjected to interfer-

ence, a line reactor or starting-current limiting device

should be connected upstream of the cooling unit to

restrict the startup current of the cooling unit.

4.5.6 Potential equalisation

If, for EMC reasons, the unit is to be integrated into

the existing potential equalisation system at the

customer, a conductor with a larger nominal cross-

section can be connected to the potential equalisa-

mounted cooling units.

According to the standard, the PE conductor in the

mains connection cable is not classified as an equi-

potential bonding conductor.

4.6 Carrying out the electrical installation

4.6.1 Bus connection

(only in conjunction with several units

with an e-Comfort controller)

When using several cooling units, the serial device

interface X2 can be used to connect up to ten cool-

ing units with the bus cable (Model No. SK 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. SK 3124.200) may be

connected to X3. This is used to evaluate system

messages in a PLC, for remotely setting parameters

and monitoring, or for integration into the facility

management system.

4.6.3 Installing external transformers

For SK 3361.x40 only.

Fig. 19: Installing external transformers (SK 3361.x40 only)

Note:

The electrical signals at the X2 interface are

of an extra-low voltage (not extra-low safety

voltages to EN 60 335-1).

Caution!

Regarding the last slave unit in the

group, do not, under any circumstances,

connect the remaining socket of the

Y cable SK 3124.100 into interface X3

of the cooling unit!

Attachment of the

unit’s rear panel

Mounted on 35 mm

support rail

DIN EN 50 022

Electrical connection

cooling unit

Connection at

the customer’s

230 V

tion connection point (attachment points) on wall-

14 Rittal cooling unit assembly and operating instructions

4 Assembly and connection

Fig. 20: Connection example: Master-slave operation

Legend

1 Serial interface (Model No. SK 3124.200)

2 Serial interface cable

3 Master-slave bus cable (Model No. SK 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. 21: Connection example: Door limit switch and master-slave operation

Legend

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. 1 on page 5, for key see page 19).

• If you would like the system messages from the

cooling unit to be evaluated via the system

message relay, you should also connect a suitable

low-voltage cable to connection clamps 3 – 5.

CMC

I/O unit

RTT

Master

Adr.: 09

X2 X3

X2 X3 X2

X2 X2

St. St. St.

Bu.

St.

Bu.

Adr.: 11 Adr.: 12RTT

Slave

RTT

Slave

Adr.: 19RTT

Slave

St.

Bu.

St.

Bu.

X10

12345

X10

X10 X10 X10 X10

X2 X2 X2 X2 X2 X2

12345

L2 L3 L1

12345

L2 L3 L1

12345

L2 L3 L1

12345

L2 L3

12345

X10

23456

Adr.: 06 Adr.: 11 Adr.: 12 Adr.: 13 Adr.: 14 Adr.: 15

22 2 2 2

34432

Adr.: 16

4 Assembly and connection

Rittal cooling unit assembly and operating instructions 15

Fig. 22: Electrical wiring plan no. 1

Fig. 23: Electrical wiring plan no. 2

22 21

X1 L1 L2

12345

Mains

12312321

Power S1

123

NTC I red

NTC E blue

Te r m

L1 L2 R1

SK 3302.100/.110, SK 3302.300/.310

X1 L1 L2

12345

12 3 12 3 21

Power

123

NTC_I

Serial2

22 21

X2 X3

83A2

NTC_E

NTC_C

NTC_A

Level

Te r m

K2 K1 MS1

SK 3303.500/.510, SK 3303.600/.610, SK 3361.500/.510, SK 3361.600/.610

Mains

16 Rittal cooling unit assembly and operating instructions

4 Assembly and connection

Fig. 24: Electrical wiring plan no. 3

Fig. 25: Electrical wiring plan no. 4

SK 3361.540/.640

L1 PE 12345

22 21

5X1

123

Power

12312

NTC I red

123

X2 X3

K2 K1 MS1Serial

NTC E blue

NTC C white

NTC A yellow

Level green

Term

L1 L2 PE

230 V

Mains

PE PE

SK 3304.500/.600/.510/.520/.504/.514/.610

12312321

Power

123

Serial

MS1

PE 12345

X2 X3A2

NTC I red

NTC E blue

NTC C white

NTC A yellow

Level green

Te r m

22 21

L2L1

PE PE

F11

Mains

4 Assembly and connection

Rittal cooling unit assembly and operating instructions 17

Fig. 26: Electrical wiring plan no. 5

Fig. 27: Electrical wiring plan no. 6

22 21

12312321

F10 F11 E1

Power

123

SerialB1

MS1

L1 L2

L1 L2/N

L1 L2

NPE 12345

NTC I red

NTC E blue

NTC C white

NTC A yellow

Level green

Te r m

C12

C11

SK 3305.500/.510/.504/.514/.520, SK 3328.500/.510/.504/.514/.520, SK 3329.500/.510/.504/.514/.520,

SK 3305.600/.610, SK 3328.600/.610, SK 3329.600/.610

F11

MainsPE PE

SK 3304.540, SK 3304.544, SK 3305.540, SK 3305.544, SK 3328.540/.544, SK 3329.540/.544,

SK 3304.640, SK 3305.640, SK 3328.640, SK 3329.640, SK 3366.540, SK 3366.640

NTC I red

PE X2

L1 PE 12345

L3L2

321

Power

12241

1234

F3F2 F4

12341212312

M4 F5

X1 X3

22 21

NTC E blue

NTC C white

NTC A yellow

Level green

Te r m

MS1Serial

12343

K2 K1

F11 F12

Mains

18 Rittal cooling unit assembly and operating instructions

4 Assembly and connection

Fig. 28: Electrical wiring plan no. 7

Fig. 29: Electrical wiring plan no. 8

SK 3366.500/.510/.600/.610

22 21

12312321

F10

F11 E1

Power

321

123

SerialB1

L1 L2

L1 L2/N

L1 L2

NPE 12345

X3A2

NTC I red

NTC E blue

NTC C white

NTC A yellow

Level green

Te r m

F11

Mains

M51

C1.2

C1.1

SK 3332.540/.640

RST

Power

2413

412321

L1 PE 12345

3212

123

NTC I red

SerialB1

22 21

NTC E blue

NTC C white

NTC A yellow

Level green

Te r m

MS1

X1 L2 L3

1234

F11

F12

Mains

4 Assembly and connection

Rittal cooling unit assembly and operating instructions 19

Legend

A1 Power PCB

A2 Display terminal

A3 Starter relay and RC element

B1 Temperature sensor, internal temperature

B2 Icing hazard temperature sensor

B3 Condenser temperature sensor

B4 Ambient temperature sensor

B5 Condensate warning sensor (optional)

C1.2 Start-up capacitor

C1.1, C2, C4 Running capacitors

E1 Condensate evaporator

F2 PSAH pressure-operated switch (3302.1x0 has bridge instead of pressostat)

F3 Bimetal contact compressor

F11/F12 Miniature fuses, condensate evaporator

K1 Relay collective fault 1

K2 Relay collective fault 2

L1 LED operational green

L2 LED alarm red

M1 Compressor

M2 Condenser fan

M4 Evaporator fan

R1 Potentiometer for setting the temperature

S1 Door limit switch (without door limit switch: terminal 1, 2 open)

T1 Transformer (optional)

X1 Main terminal strip

X2 Master-slave connection

X3 Optional interface

Tab. 2: Contact data

Note:

For technical data refer to the rating plate.

cos f = 1

L/R = 20 ms

I max. = 2 A

U max. = 250 V

I min. = 100 mA

U max. = 200 V

U min. = 18 V

I max. = 2 A

20 Rittal cooling unit assembly and operating instructions

5 Commissioning

4.7 Finalising assembly

4.7.1 Installing the filter media

The cooling unit condenser is finished all over with a

dirt-repelling, easy-to-clean RiNano coating. In many

cases, therefore, the use of filter media is unneces-

sary, particularly in the case of dry dusts.

For dry, coarse dust and lint in the ambient air, we

recommend installing an additional PU foam filter

mat (available as an accessory) in the cooling unit.

For air containing oil condensation, we recommend

the use of metal filters (also available as an accesso-

ry). When used in textile plants with heavy lint con-

tamination, lint screens should be used (available as

an optional extra).

• Pull the louvred air inlet grille from the enclosure.

• Insert the filter mat into the louvred grille as shown

in Fig. 30 and push it back onto the enclosure.

Fig. 30: 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.

Fig. 31: 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

measuring the temperature difference in the external

circuit of the cooling unit (see “6.2.6 Programming

overview”, page 26). As the level of filter mat soiling

rises, the temperature difference will increase. The

nominal 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 nominal value

for different operating points of the cooling unit.

5 Commissioning

• 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 sec.,

followed by “ECO” for activated eco-mode. Then

the enclosure internal temperature appears in the

7-segment display.

You can now make your individual settings on the

unit, e.g. set the temperature or (with e-Comfort con-

troller only) assign the network identifier, etc. (refer to

the “Operation” chapter).

Caution! Risk of damage!

The oil must collect in the compressor in

order to ensure effective lubrication and

cooling.

Do not operate the cooling unit for

at least 30 min. after assembling the

equipment.

6 Operation

Rittal cooling unit assembly and operating instructions 21

6Operation

You can operate the cooling unit using the controller

on the front of the device (Fig. 1, no. 11, page 5).

Depending on the model, the unit is equipped with

a Basic or an e-Comfort controller.

6.1 Control using the Basic controller

For unit types SK 3302.xxx.

Fig. 32: Basic controller

Legend

1 Controller trim panel

2 Temperature setting

3 LED green (“line”)

4 LED red (“alarm”)

5 Reset button

6.1.1 Properties

– Two voltage variants are supported:

–115 V

–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-operated switch has switched

– Switching hysteresis: 5 K.

If the cooling unit is oversized and compressor

running times are < 1 minute the switching

hysteresis is automatically increased to protect

the cooling unit.

– Floating system message contact in case

of overtemperature

– Temperature setting

(setting range 30 – 55°C) via potentiometer

– Test function

– System messages via flashing mode

(see “6.1.2 Operating and error system”,

page 22)

The cooling unit operates automatically i.e. after

switching on the power supply, the evaporator fan

(see Fig. 2, page 5) will run continuously and perma-

nently circulate the internal 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.

22 Rittal cooling unit assembly and operating instructions

6 Operation

6.1.2 Operating and error display

The Basic controller monitors and controls the cool-

ing unit. It indicates the operating and error status via

the green and red LEDs (Fig. 32, no. 3 and 4):

Tab. 3: Operating and error display of the Basic controller

Key to flash intervals

| = 500 ms (red LED on)

_ = 500 ms (red LED off)

***** = 3 s pause (red LED off)

The overtemperature message (red LED illuminated)

may also be polled via an integral floating contact on

the connection clamp of the cooling unit (system

message relay with changeover contact, see con-

nection diagrams under “4.6.4 Installing the power

supply”, page 14):

– Terminal 3: NC (normally closed)

– Terminal 4: C (connection of the supply voltage

to the system message 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,

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.

LED Status Cause Solution

Green

(line)

Illuminated Voltage present,

unit operational

–

Flashing Only with door limit switch installed:

Enclosure door open

In order to avoid condensation, close the

enclosure 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) |_|_|*****|_|_|*****|_|_|*****|_|_|*****|_|_|*****

Interior temperature

sensor defective

(4) |_|_|_|*****|_|_|_|*****|_|_|_|*****|_|_|_|*****

Anti-icing sensor

defective

(5) |_|_|_|_|*****|_|_|_|_|*****|_|_|_|_|*****|_|_|_|_|

Overload Compressor overloaded (6) |_|_|_|_|_|*****|_|_|_|_|_|*****|_|_|_|_|_|*****

Interior fan overloaded (7) |_|_|_|_|_|_|*****|_|_|_|_|_|_|*****|_|_|_|_|_|_|

Exterior fan overloaded (8) |_|_|_|_|_|_|_|*****|_|_|_|_|_|_|_|*****

Device

status/

condition

Overload mode

(heat loss)

(9) |_|_|_|_|_|_|_|_|*****|_|_|_|_|_|_|_|_|*****

Warning

(ambient

conditions)

Anti-icing alarm (2) |_|*****|_|*****|_|*****|_|*****|_|*****|_|*****|_|

Off No

display

No power – Check power supply

Rotary current phase

monitoring

“LED off” = Incorrect

phase connection

–Swap phases

6 Operation

Rittal cooling unit assembly and operating instructions 23

6.1.3 Test mode for the Basic controller

The Basic controller is equipped with a test function

whereby the cooling unit commences cooling ope-

ration independently of the set temperature or door

limit switch function.

First you must dismantle the trim panel of the controller.

• 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

forwards slightly.

Fig. 33: Loosen the trim panel of the Basic controller

• Carefully raise 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

illuminated.

• Next, rotate the potentiometer back to the required

setpoint.

6.1.4 Setting the temperature

To change the temperature setting:

• Dismantle the trim panel of the controller as

described in “6.1.3 Test mode for the Basic

controller”, page 23.

• Set the required temperature on the temperature

setting device (Fig. 32, page 21).

• 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 manually reset the Basic controller:

• Dismantle the trim panel of the Basic controller

as described in “6.1.3 Test mode for the Basic

controller”, page 23.

• Press the reset button (Fig. 32, no. 5) for at least

3 sec.

The red LED is extinguished.

• Re-install the Basic controller.

6.2 Control using the e-Comfort controller

For unit types SK 33xx.5xx and SK 33xx.6xx.

Fig. 34: e-Comfort controller

Legend

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)

4 7-segment display

6.2.1 Properties

– Three voltage variants are supported:

–115 V

–230 V

– 400/460 V, 3-phase, supports multiple voltages

without rewiring

– Integral start-up delay and door limit switch

function

Note:

With the Basic controller, the temperature

is preset at the factory to +35°C. In order

to save energy, do not set the temperature

any lower than is actually necessary.

24 Rittal cooling unit assembly and operating instructions

6 Operation

– 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 connect-

ed slave devices or in the event of the door limit

switch function, the affected slave unit will report

to the master unit, which will switch all the other

cooling units on or off as required.

– Switching hysteresis: Adjustable within the range

2 – 10 K, preset to 5 K.

– Visualisation of the current enclosure internal tem-

perature and all error messages in the 7-segment

display.

–

Using an interface card (Model No. SK 3124.100)

the unit may be incorporated into higher-level

remote monitoring systems such as the Rittal

Computer Multi Control CMC.

The cooling unit operates automatically i.e. after

switching on the power supply, the evaporator fan

(see Fig. 2, page 5) starts to run and circulates the

internal enclosure air. The compressor and con-

denser fan are regulated by the e-Comfort controller.

The e-Comfort controller has a 7-segment display

(Fig. 34, no. 4). After switching on the power supply,

the current software version initially appears on this

display for approx. 2 seconds, as well as the activat-

ed eco-mode. Followed by a preset option (e. g. t10)

or the temperature.

In regular operation, the display shows both the tem-

perature (in degrees Celsius or Fahrenheit – users

may switch between the two) and any error messages

The current enclosure internal temperature is usually

displayed permanently. In the event of an error mes-

sage, this will alternate with the temperature display.

The unit is programmed using buttons 1 – 3 (Fig. 34).

The relevant parameters also appear in the display.

6.2.2 Eco-mode

All Rittal TopTherm cooling units with e-Comfort

controller from firmware 3.2 have the energy-saving

eco-mode, which is activated in the delivered state.

The eco-mode is used to save energy in the cooling

unit 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

evaporator fan in the internal circuit is switched off as

appropriate if the actual enclosure internal tempera-

ture drops to 10 K below the setpoint temperature

set. To reliably measure the internal temperature

also during this process, the fan starts cyclically for

30 sec. (see Fig. 35). If the internal temperature

reaches the range 5 K below the setpoint set again,

the fan switches back to continuous operation.

If required, the eco-mode can be deactivated via the

control display. For this purpose switch the parame-

ter from 1 to 0 in the programming level (see Tab. 4,

page 25). The fan then runs continuously.

Fig. 35: Diagram of eco-mode

6.2.3 Launching test mode

The e-Comfort controller is equipped with a test func-

tion whereby the cooling unit commences cooling

operation independently of the set temperature or

door limit switch function.

• Simultaneously press buttons 1 and 2 (Fig. 34)

for at least 5 sec.

The cooling unit will commence operation.

After approximately 5 minutes, test mode will end.

The unit switches off and changes to normal oper-

ation.

6.2.4 General programming information

Using buttons 1, 2 and 3 (Fig. 34) you can change

24 parameters within the preset ranges (min. value –

max. value).

Tables 4 and 5 show the parameters which can be

altered. Fig. 36 of page 26 shows which buttons

must be pressed.

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 is oversized and compressor running

times are < 1 minute the switching hysteresis

is automatically increased to protect the

cooling unit.

Note on temperature settings:

With the e-Comfort controller, the tempe-

rature 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

necessary.

Note on useful cooling output:

Interactive performance diagrams for

calculating the useful cooling output may

be found at www.rittal.com.

Internal fan

status

Internal

temperature

Time

Setpoint

–5°C

Setpoint

–10°C

OFF

10 min.

30 sec.

10 min.

6 Operation

Rittal cooling unit assembly and operating instructions 25

In principle, the programming is identical for all

editable parameters.

To enter programming mode:

• Press button 2 (“Set”) for approx. 5 sec.

The controller is now in programming mode. While in

programming mode, if you do not press any buttons

for approx. 30 sec., the display will first flash, then

the controller will switch back to normal display

mode. The “Esc” display indicates that any made

changes have not been saved.

• Press the programming buttons ▲ (°C) or ▼ (°F)

to switch back and forth between the editable

parameters (see tables 4 and 5).

• Press button 2 (“Set”) to select the displayed

parameter for editing.

The current value of this parameter is displayed.

• Press one of the programming buttons ▲ (°C) or

▼ (°F).

The “Cod” display will appear. 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 sec.

“Acc” will appear in the display to indicate that the

changes have been saved. The display will then

switch back to regular operation (enclosure internal

temperature).

You can also program the e-Comfort controller

using a

diagnosis software package (Model No.

SK 3159.100),

the supply of which also includes

a connection cable to the PC. The cable connector

on the rear of the e-Comfort controller display serves

as an interface.

6.2.5 Editable parameters

See also Fig. 36 on page 26.

Tab. 5: System messages which may be evaluated via relays

The system messages A1 – A19 may additionally be

evaluated via two floating system message relays. In

this way, one of the two system message relays may

be allocated to each system message.

System alarm relay with normally open contact: see

connection diagrams under “4.6.4 Installing the

power supply”, page 14:

– Terminal 3: NO (normally open, relay 2)

– Terminal 4: C (connection of the supply voltage

to the system message relay)

– Terminal 5: NO (normally open, relay 1)

The definition NO refers to the de-energised state.

As soon as power is applied to the cooling unit, both

system message relays (relay 1 and 2) energise.

This is the normal operating state of the cooling unit.

As soon as a system message occurs or the power

supply is interrupted, the corresponding relay will

drop out and open the contact.

Program system messages with the value

0: System message is not sent to the system

message relay, but merely appears in the

display

1: System message is evaluated by relay 1

2: System message is evaluated by relay 2

Progr.

level

Display

screen

Min.

value

Max.

value

Factory

setting

Type or location of fault

7 A1 0 2 0 Enclosure door open

8 A2 0 2 0 Internal temperature of enclosure too high

9 A3 0 2 0 Filter monitoring

10 A4 0 2 0 Ambient temperature too high/too low

11 A5 0 2 0 Icing hazard

12A6 021 PSA

H pressure-operated switch

13 A7 0 2 2 Evaporator coil

14 A8 0 2 1 Condensate warning

15 A9 0 2 1 Condenser fan blocked or defective

16 A10 0 2 1 Evaporator fan blocked or defective

17 A11 0 2 2 Compressor

18 A12 0 2 1 Condenser

19 A13 0 2 1 Ambient temperature sensor

20 A14 0 2 1 Icing temperature sensor

21 A15 0 2 1 Condensate warning temperature sensor

22 A16 0 2 1 Internal temperature sensor

23 A17 0 2 1 Phase monitoring

24 A18 0 2 0 EPROM

25 A19 0 2 0 LAN/Master-Slave

28 Rittal cooling unit assembly and operating instructions

6 Operation

6.2.8 Setting the master-slave identifier

When several cooling units are connected together

(maximum ten), one of the cooling units must be

defined as the “master” and the others as “slaves”.

For this purpose, assign a corresponding identifier

(address) to each cooling unit which will enable the

cooling unit to be identified in the network.

If one of the slave units reaches the set temperature

or if the door limit switch function is activated, the

affected slave unit will report to the master unit,

which then deactivates all the other cooling units.

On the master cooling unit (00 = factory setting),

set the number of slave units present in the network:

01: Master with 1 slave cooling unit

02: Master with 2 slave cooling units

03: Master with 3 slave cooling units

04: Master with 4 slave cooling units

05: Master with 5 slave cooling units

06: Master with 6 slave cooling units

07: Master with 7 slave cooling units

08: Master with 8 slave cooling units

09: Master with 9 slave cooling units

On the slave cooling unit (00 = factory setting),

set its own address:

11: Slave cooling unit no. 1

12: Slave cooling unit no. 2

13: Slave cooling unit no. 3

14: Slave cooling unit no. 4

15: Slave cooling unit no. 5

16: Slave cooling unit no. 6

17: Slave cooling unit no. 7

18: Slave cooling unit no. 8

19: Slave cooling unit no. 9

Fig. 37: Master-slave connection (example)

For further connection examples, see “4.6.1 Bus

connection (only in conjunction with several units

with an e-Comfort controller)”, page 13.

For details of how to set the identifier, see “6.2.5

Editable parameters”, page 25 or “6.2.6 Program-

ming overview”, page 26, parameter “Ad”.

6.2.9 Evaluating system messages

In the e-Comfort controller, system messages are

indicated by a number in the display.

Following the appearance of messages A03, A06

and A07 and after rectifying their cause, you will

need to reset the e-Comfort controller (see “6.2.10

Resetting the e-Comfort controller”, page 30).

Notes:

– Only one unit may be configured as

master, and its identifier must match the

number of slave units connected.

– The slave units must have different

identifiers.

– The identifiers must be numbered in

ascending order without any gaps.

Master

Slave

6 Operation

Rittal cooling unit assembly and operating instructions 29

Tab. 6: Troubleshooting with the e-Comfort controller

Display

screen

System message Possible cause Measures to rectify the fault

A01 Enclosure door open Door open or door limit switch

incorrectly positioned

Close door, position door limit switch correctly,

check connection if necessary

A02 Internal temperature

of enclosure too high

Cooling capacity inadequate/unit undersized.

Error as a consequence of messages A03 to

A17.

Check cooling capacity

A03 Filter monitoring Filter mat soiled Clean or replace;

reset the e-Comfort controller

A04 Ambient temperature

too high/too low

Ambient temperature outside of admissible

operating range (+10°C to +60°C)

Raise or lower the ambient temperature

(e.g. heat or ventilate the room)

A05 Icing hazard Operational display in case of icing hazard.

Evaporator coil fan may be mechanically

blocked, defective, or cold air outlet

obstructed.

Set the enclosure interior temperature to

a higher value. Check the evaporator fan;

release or exchange if necessary.

A06 PSAH pressure-operated

switch

Ambient temperature too high Lower the ambient temperature;

reset the e-Comfort controller

Condenser soiled Clean the condenser;

reset the e-Comfort controller

Filter mat soiled Clean or replace;

reset the e-Comfort controller

Condenser fan defective Replace; reset the e-Comfort controller

E-valve defective Have the sensor repaired by a refrigeration

engineer; reset the e-Comfort controller

PSAH pressure-operated switch defective Have the switch replaced by a refrigeration

engineer; reset the e-Comfort controller

A07 Evaporator coil Lack of coolant; sensor in front of or behind

condenser defective.

Have the sensor repaired by a refrigeration

engineer; reset the e-Comfort controller

A08 Condensate warning Condensate discharge kinked or blocked Check condensate discharge; repair any kinks

or blockages in the hose as necessary

Only in units with optional

condensate evaporation

Check the evaporation unit,

exchange if necessary

A09 Condenser fan Blocked or defective Clear the blockage; replace if necessary

A10 Evaporator fan Blocked or defective Clear the blockage; replace if necessary

A11 Compressor Compressor overloaded

(internal winding protection)

No action required;

unit switches back on automatically.

Defective

(check by measuring the winding resistance)

Exchange by refrigeration engineer

A12 Condenser temperature

sensor

Open or short-circuit Replace

A13 Ambient temperature

sensor

Open or short-circuit Replace

A14 Icing temperature sensor Open or short-circuit Replace

A15 Condensate warning

temperature sensor

Open or short-circuit Replace

A16 Internal temperature sensor Open or short-circuit Replace

A17 Phase monitoring For three-phase devices only:

Incorrect rotary field/phase absent

Exchange two phases

A18 EPROM error New board obstructed Software update needed (only following board

installation with more recent software):

Enter the programming level with Code 22;

press button 1 and confirm with “Set” until

“Acc” appears. Next, disconnect the unit from

the mains and reconnect.

A19 LAN/Master-Slave Master and slave not connected Check setting and/or cable

A20 Voltage drop Error display not shown Event is stored in the log file

E0 Display message Connection problem between the display

and the controller board

Reset: Switch power supply off, then switch

on again after approx. 2 sec.

Cable defective; connection loose Exchange the boards

OL Overload Ambient parameters or heat loss outside of the applicable limits

b07 Cooling circuit leak Sensor B3 and B4 mixed up Correct sensor position

rSt Reset Manual device reset required,

see “6.2.10 Resetting the e-Comfort controller”, page 30.

30 Rittal cooling unit assembly and operating instructions

7 Inspection and maintenance

6.2.10 Resetting the e-Comfort controller

After the occurrence of faults A03, A06 and A07,

you will need to reset the e-Comfort controller.

• Press buttons 1 (▲) and 3 (▼) (Fig. 34) simul-

taneously for 5 sec.

The system messages will disappear and the tem-

perature display will be shown.

7 Inspection and maintenance

7.1 General

The cooling circuit is designed in the form of a main-

tenance-free, hermetically sealed system. The cool-

ing unit is filled with the required quantity of refriger-

ant at the factory, checked for leaks, and subjected

to a functional test run.

The installed maintenance-free fans are mounted on

ball bearings, protected against moisture and dust,

and fitted with a temperature monitor. The life expec-

tancy is at least 30,000 operating hours. The cooling

unit is thus largely maintenance-free. All that may be

required from time to time is to clean the components

of the external air circuit using a vacuum cleaner or

compressed air if they become visibly dirty. Any

stubborn, oily stains may be removed using a non-

flammable detergent, such as degreaser.

Maintenance interval: 2000 operating hours. Depen-

ding on the level of contamination in the ambient air,

the maintenance interval may be reduced to suit the

air pollution intensity.

Sequence of maintenance measures:

– Check the level of dirt.

– Filter soiling? Replace the filter if necessary.

– Cooling membranes soiled? Clean if necessary.

– Activate test mode; cooling function OK?

– Check noise generation of compressor and fans.

7.1.1 Compressed air cleaning

SK 3304.xxx, SK 3305.xxx

Fig. 38: Disconnect the power cord

Fig. 39: Remove the upper louvred grille

Risk of electric shock!

The unit is live.

Switch off the power supply before open-

ing, and take suitable precautions

against

it being accidentally switched back on.

Caution!

Risk of fire!

Never use flammabel liquids

for cleaning.

7 Inspection and maintenance

Rittal cooling unit assembly and operating instructions 31

Fig. 40: Remove the lower louvred grille

Fig. 41: Remove the infill panel

Fig. 42: Disconnect the connector from the display (1)

Fig. 43: Disconnect the connector from the display (2)

32 Rittal cooling unit assembly and operating instructions

7 Inspection and maintenance

Fig. 44: Cooling unit without grille

Fig. 45: Remove the external circuit fan

(loosen the four screws)

Fig. 46: Remove the fan

Fig. 47: Disconnect the fan connectors

Fig. 48: Dismantle cover (loosen 4 nuts)

Fig. 49: Push back the display cable

Fig. 50: Push the display cable through the cable gland

7 Inspection and maintenance

Rittal cooling unit assembly and operating instructions 33

Fig. 51: Remove the cover (1)

Fig. 52: Remove the cover (2)

Fig. 53:

Loosen the earthing cable between the cover

and the chassis (1)

Fig. 54:

Loosen the earthing cable between the cover

and the chassis (2)

Fig. 55: Clean out the heat exchanger coil and compressor

chamber using compressed air (1)

34 Rittal cooling unit assembly and operating instructions

7 Inspection and maintenance

Fig. 56: Clean out the heat exchanger coil and compressor

chamber using compressed air (2)

7.1.2 Compressed air cleaning

SK 3328.xxx, SK 3329.xxx, SK 3332.xxx

Fig. 57: Disconnect the power cord

Fig. 58: Remove the upper louvred grille (1)

Fig. 59: Remove the upper louvred grille (2)

7 Inspection and maintenance

Rittal cooling unit assembly and operating instructions 35

Fig. 60: Remove the upper louvred grille (3)

Fig. 61: Remove the lower louvred grille (1)

Fig. 62: Remove the lower louvred grille (2)

Fig. 63: Remove the infill panel

36 Rittal cooling unit assembly and operating instructions

7 Inspection and maintenance

Fig. 64: Disconnect the display cable

Fig. 65: Push back the display cable and press it through

the cable gland (1)

Fig. 66: Push back the display cable and press it through

the cable gland (2)

Fig. 67: Loosen the four screws of the external circuit fan

Fig. 68: Remove the external circuit fan

Fig. 69: Disconnect the fan connectors (1)

Fig. 70: Disconnect the fan connectors (2)

Fig. 71: Disconnect the fan connectors (3)

7 Inspection and maintenance

Rittal cooling unit assembly and operating instructions 37

Fig. 72: Disconnect the fan earthing cable (1)

Fig. 73: Disconnect the fan earthing cable (2)

Fig. 74: Loosen the four nuts of the cover

Fig. 75: Remove the cover

Fig. 76: Disconnect the earthing cable (1)

38 Rittal cooling unit assembly and operating instructions

7 Inspection and maintenance

Fig. 77: Disconnect the earthing cable (2)

Fig. 78: Clean out the heat exchanger coil and compressor

chamber using compressed air (1)

Fig. 79: Clean out the heat exchanger coil and compressor

chamber using compressed air (2)

Fig. 80: Clean out the heat exchanger coil and compressor

chamber using compressed air (3)

8 Storage and disposal

Rittal cooling unit assembly and operating instructions 39

8 Storage and disposal

During storage, the cooling unit must stand upright.

The closed cooling circuit contains refrigerant and oil

which must be properly disposed of for the sake of

the environment. Disposal can be performed at the

Rittal plant.

Please contact us for advice.

9 Technical specifications

Fig. 81: Rating plate (technical specifications)

– Observe the mains connection data (voltage and

frequency) as per the rating plate.

– Observe the pre-fuse as per the specifications on

the rating plate.

Caution! Risk of damage!

The cooling unit must not be subjected

to temperatures above +70°C during

storage.

40 Rittal cooling unit assembly and operating instructions

9 Technical specifications

EN Unit Model No. SK

Basic controller,

RAL 7035 –3302.100 3302.110 3302.300 3302.310 – – – –

Basic controller,

stainless steel –3302.2003302.210––––––

e-Comfort controller,

RAL 7035 –– – – – 3303.500 3303.510 3304.500 3304.510

e-Comfort controller,

NEMA 4X –– – – – 3303.504 3303.514 3304.504 3304.514

e-Comfort controller,

stainless steel cover –– – – – 3303.600 3303.610 3304.600 3304.610

Rated voltage V

230, 1~,

50/60

115, 1~,

230, 1~,

50/60

115, 1~,

230, 1~,

50/60

115, 1~,

230, 1~,

50/60

115, 1~,

50/60

Rated current A 1.6/1.7 3.3 1.6/1.7 4.0 2.6/2.6 5.7 3.9/4.3 8.0/8.8

Start-up current A 3.0/3.4 8.0 4.3/5.3 12.0 5.1/6.4 11.5 12.0/14.0 26.0/28.0

Pre-fuse T A 10.0 10.0 10.0 10.0 10.0 10.0 10.0 11.0 – 16.0

Motor circuit-breaker –––––––––

Transformer circuit-breaker––––––––䡲

Miniature circuit breaker or

fuse gG (T) –䡲䡲䡲䡲䡲䡲䡲 –

Useful cooling output

QkL 35 L 35

to DIN 3168 L 35 L 50

300/320

150/170

300

150

300/320

150/160

300

150

500/610

280/350

500

280

1000/1450

1050/1100

1000/1450

980/1050

Power consumption Pel L 35 L 35

to DIN 3168 L 35 L 50

245/255

255/275

290

340

285/300

320/340

290

340

360/380

420/390

470

500

640/720

750/850

670/750

780/880

Refrigeration factor H = Qk/Pel 1.2 1.2 1.1 1.1 1.4 1.4 1.6 1.6

Refrigerant

– Type

– Filling

–

R134a

100

R134a

100

R134a

100

R134a

170

R134a

170

R134a

325

R134a

325

Admissible pressure bar2525252528282525

Temperature setting range °C +20 to +55 +20 to +55 +20 to +55 +20 to +55 +20 to +55 +20 to +55 +20 to +55 +20 to +55

Setting range °C +30 to +55 +30 to +55 +30 to +55 +30 to +55 +20 to +55 +20 to +55 +20 to +55 +20 to +55

Noise level dB (A) < 61 < 61 < 61 < 61 < 61 < 61 < 64 < 64

Protection category to EN 60 529

– Internal circuit

– External circuit

–

IP 54

IP 34

Protection category – (NEMA 4X)1)

Dimensions (W x H x D) mm 280 x 550 x 140 525 x 340 x 153 280 x 550 x 206

(285 x 620 x 298

)

400 x 950 x 260

(405 x 1020 x 358)1)

Weight kg 13 13 13 17 17 (25)1) 17 (25)1) 39 (49)1) 44 (54)1)

1) Information relevant for NEMA 4X

9 Technical specifications

Rittal cooling unit assembly and operating instructions 41

Unit Model No. SK

e-Comfort controller,

RAL 7035 –3304.540 3305.500 3305.510 3305.540 3328.500 3328.510 3328.540 3329.500

e-Comfort controller,

NEMA 4X –3304.544 3305.504 3305.514 3305.544 3328.504 3328.514 3328.544 3329.504

e-Comfort controller,

stainless steel cover –3304.640 3305.600 3305.610 3305.640 3328.600 3328.610 3328.640 3329.600

Rated voltage V, Hz

400, 3~, 50/

460, 3~, 60

230, 1~,

50/60

115, 1~,

50/60

400, 3~, 50/

460, 3~, 60

230, 1~,

50/60

115, 1~,

50/60

400, 3~, 50/

460, 3~, 60

230, 1~,

50/60

Rated current A 2.2/2.1 5.5/5.8 11.5/12.5 2.5/2.8 6.1/6.6 13.4/14.8 2.8/3.3 8.2/9.3

Start-up current A 11.5/12.7 22.0/24.0 26.0/28.0 12.2/11.3 20.0/22.0 40.0/38.0 6.8/7.8 20.0/24.0

Pre-fuse T A 6.3 – 10.0 16.0 14.0 – 20.0 6.3 – 10.0 16.0 18.0 – 25.0 6.3 – 10.0 16.0

Motor circuit-breaker – 䡲 ––䡲 ––䡲 –

Transformer circuit-breaker – – – 䡲 ––䡲 ––

Miniature circuit breaker or

fuse gG (T) –– 䡲 – – 䡲 ––䡲

Useful cooling output QkL 35 L 35

to DIN 3168 L 35 L 50

1000/1460

880/990

1500/1510

1150/1200

1500/1660

1150/1270

1500/1510

1230/1250

2000/2360

1620/1745

2000/2360

1620/1745

2000/2350

1450/1690

2500/2660

1840/1920

Power consumption Pel L 35 L 35

to DIN 3168 L 35 L 50

670/820

760/930

870/980

1030/1150

1010/900

1180/1060

820/1000

980/1170

935/1055

1080/1250

965/1085

1110/1280

920/1145

1145/1395

1270/1410

1470/1700

Refrigeration factor H = Qk/Pel 1.71.71.51.82.12.12.22.0

Refrigerant

– Type

– Filling

–

R134a

325

R134a

600

R134a

600

R134a

600

R134a

950

R134a

950

R134a

950

R134a

950

Admissible pressure bar2525252528282828

Temperature setting range °C +20 to +55 +20 to +53 +20 to +53 +20 to +55 +20 to +55 (+20 to +50)1)

Setting range °C +20 to +55 +20 to +50 +20 to +50 +20 to +55 +20 to +55 (+20 to +50)1)

Noise level dB (A) < 64 < 64 < 64 < 64 < 64 < 64 < 64 < 64

Protection category to EN 60 529

– Internal circuit

– External circuit

–

IP 54

IP 34

Protection category – (NEMA 4X)1)

Dimensions (W x H x D) mm 400 x 950 x 260 (405 x 1020 x 358)1) 400 x 1580 x 295 (405 x 1650 x 388)1)

Weight kg 40 (50)1) 41 (51)1) 46 (56)1) 42 (52)1) 66 (80)1) 73 (87)1) 67 (80)1) 69 (83)1)

1) Information relevant for NEMA 4X

42 Rittal cooling unit assembly and operating instructions

9 Technical specifications

Unit Model No. SK

e-Comfort controller, RAL 7035 –3329.510 3329.540 3332.540 3361.500 3361.510 3361.540

e-Comfort controller, NEMA 4X –3329.514 3329.544 – – – –

e-Comfort controller, stainless steel cover –3329.610 3329.640 3332.640 3361.600 3361.610 3361.640

Rated voltage V, Hz 115, 1~,

50/60

400, 3~, 50/

460, 3~, 60

400, 3~, 50/

460, 3~, 60

230, 1~,

50/60

115, 1~,

400, 2~,

50/60

Rated current A 17.0/20.0 3.7/3.8 4.2/4.2 2.7/2.7 5.3 1.2/1.4

Start-up current A 44.0/42.0 6.8/7.6 9.2/11.0 6.0/9.6 12.0 3.1/3.3

Pre-fuse T A 18.0 – 25.0 6.3 – 10.0 6.3 – 10.0 10.0 10.0 6.3 – 10.0

Motor circuit-breaker – – 䡲䡲 –––

Transformer circuit-breaker – 䡲 –– ––䡲

Miniature circuit breaker or fuse gG (T) – – – – 䡲䡲 –

Useful cooling output QkL 35 L 35

to DIN 3168 L 35 L 50

255/2660

1840/1920

2500/2700

1900/1950

4000/4400

3070/3570

750/790

570/570

750

500

750/790

570/570

Power consumption Pel L 35 L 35

to DIN 3168 L 35 L 50

1300/1440

1500/1730

1295/1495

1545/1845

1720/2120

1990/2460

420/450

480/510

570

670

420/450

480/510

Refrigeration factor H = Qk/Pel 1.9 1.9 2.3 1.8 1.3 1.7

Refrigerant

– Type

– Filling

–

R134a

950

R134a

950

R134a

3000

R134a

280

R134a

260

R134a

280

Admissible pressure bar 28 28 28 28 28 28

Temperature setting range °C +20 to +55 (+20 to +50)1) +20 to +52 +20 to +55

Setting range °C +20 to +55 (+20 to +50)1) +20 to +52 +20 to +55

Noise level dB (A) < 64 < 64 < 64 < 64 < 64 < 64

Protection category to EN 60 529

– Internal circuit

– External circuit

–

IP 54

IP 34

Protection category – (NEMA 4X)1)

Dimensions (W x H x D) mm

400 x 1580 x 295

(405 x 1650 x 388)

500 x 1580 x 340

280 x 550 x 206

Weight kg 76 (90)1) 70 (83)1) 91 22 22 22

1) Information relevant for NEMA 4X

Unit Model No. SK

e-Comfort controller, RAL 7035 –3366.500 3366.510 3366.540

e-Comfort controller, stainless steel cover –3366.600 3366.610 3366.640

Rated voltage V, Hz 230, 1~,

50/60

115, 1~,

50/60

400, 3~, 50/

460, 3~, 60

Rated current A 6.7/6.9 13.6/13.8 2.7/2.9

Start-up current A 22.0/24.0 43.0/47.0 8.0/8.8

Pre-fuse T A 10.0 14.0 – 20.0 6.3 – 10.0

Motor circuit-breaker – – – 䡲

Transformer circuit-breaker – – 䡲 –

Miniature circuit breaker or fuse gG (T) – 䡲 ––

Useful cooling output QkL 35 L 35

to DIN 3168 L 35 L 50

1500/1500

1050/1100

1500/1500

1050/1100

1500/1500

980/1080

Power consumption Pel L 35 L 35

to DIN 3168 L 35 L 50

940/1070

1115/1230

940/1070

1115/1230

970/1120

1140/1310

Refrigeration factor H = Qk/Pel 1.6 1.6 1.5

Refrigerant

– Type

– Filling

–

R134a

700

R134a

700

R134a

700

Admissible pressure bar 28 28 28

Temperature setting range °C +20 to +55 +20 to +55 +20 to +55

Setting range °C +20 to +55 +20 to +55 +20 to +55

Noise level dB (A) 72 72 72

Protection category to EN 60 529

– Internal circuit

– External circuit

–

IP 54

IP 34

Dimensions (W x H x D) mm 450 x 1590 x 195

Weight kg454946

10 List of spare parts

Rittal cooling unit assembly and operating instructions 43

10 List of spare parts

Fig. 82: Spare parts for SK 3302.xxx

Fig. 83: Spare parts for SK 3302.3xx

55 100

SK 3302.xxx

SK 3302.3xx

100

71 71

44 Rittal cooling unit assembly and operating instructions

10 List of spare parts

Fig. 84: Spare parts for SK 3303.xxx, SK 3361.xxx

Fig. 85: Spare parts for SK 3304.xxx, SK 3305.xxx

100

SK 3303.xxx

SK 3361.xxx

100

101

SK 3304.xxx

SK 3305.xxx

102

10 List of spare parts

Rittal cooling unit assembly and operating instructions 45

Fig. 86: Spare parts for SK 3328.xxx, SK 3329.xxx

Fig. 87: Spare parts for SK 3332.xxx

SK 3328.xxx

SK 3329.xxx

100

101

102

SK 3332.xxx

100

102

101

46 Rittal cooling unit assembly and operating instructions

10 List of spare parts

Fig. 88: Spare parts for SK 3366.xxx, SK 3377.xxx

Legend

1 Compressor

5 Condenser fan

10 Evaporator fan

15 Dispatch bag

20 Expansion valve

25 Filter dryer

30 PSAH pressure-operated switch

40 Controller board

45 Louvred grille 1

46 Louvred grille 2

50 Infill panel

55 Display

71 Temperature sensor

75 Enclosure tray

80 Transformer

90 Evaporator coil

100 Condenser

101 Condensate evaporator

102 Miniature fuse, condensate evaporator

(T4A; 6.3 x 32 mm)

SK 3366.xxx

71 30

100

101

102

Note:

As well as the spare part number, when

ordering spare parts the following informa-

tion must be provided:

–Unit model

– Fabrication number

– Date of manufacture

This information may be found

on the rating plate.

11 Appendix: Cut-out and hole sizes

Rittal cooling unit assembly and operating instructions 47

11 Appendix:

Cut-out and hole sizes

11.1 Dimensions for external mounting

Fig. 89: SK 3302.xxx external mounting

(except SK 3302.3xx)

Fig. 90: SK 3302.3xx external mounting

Fig. 91: SK 3303.xxx, SK 3361.xxx external mounting

Fig. 92: SK 3366.xxx, SK 3377.xxx external mounting

Fig. 93: SK 3304.xxx, SK 3305.xxx external mounting

Fig. 94: SK 3328.xxx, SK 3329.xxx external mounting

280

550

501

251 140

525

471

340

281

153

262

266

280

480 15.5

550

532

Ø 8 (4x)

206

Ø 8

(10x) 155

354

340

326

354

260 55

260

165.5

353 360

85.5 360 353 78.5

354

400

250

350

280

32.5

255

950

350

Ø 9.5 (8x)

385

350

260

295

280

350

Ø 13 (10x)

400

310

380

1580

260

25 550

320

325

275

340

48 Rittal cooling unit assembly and operating instructions

11 Appendix: Cut-out and hole sizes

Fig. 95: SK 3332.xxx external mounting

11.2 Dimensions for partial internal

mounting

Fig. 96: SK 3303.xxx, SK 3361.xxx partial internal mounting

Fig. 97: SK 3304.xxx, SK 3305.xxx partial internal mounting

Fig. 98: SK 3328.xxx, SK 3329.xxx partial internal mounting

Fig. 99: SK 3332.xxx partial internal mounting

500

380

440

Ø 13 (10x)

45330

1580

164

360

380500

375275

340

280

(230)

254

524

Ø 8 (4x)

18 x 45

266

497

523

550

106

100

155

105

370

330

Ø 9.5 (4x)

380

950

920

25 x 45

400

370

320

Ø 13 (4x)

1558

1554

1540

1580

R9.5 (2x)

376

150

145

500

362

1530

1550

474

Ø 13 (4x)

1580

145 195

11 Appendix: Cut-out and hole sizes

Rittal cooling unit assembly and operating instructions 49

11.3 Dimensions for full internal mounting

Fig. 100: SK 3302.1xx full internal mounting

Fig. 101: SK 3302.3xx full internal mounting

Fig. 102: SK 3303.xxx, SK 3361.xxx full internal mounting

Fig. 103: SK 3304.xxx, SK 3305.xxx full internal mounting

Fig. 104: SK 3328.xxx, SK 3329.xxx full internal mounting

Fig. 105: SK 3366.xxx, SK 3377.xxx full internal mounting

18 x 45°

280

(230)

200

254

524

Ø 8 (4x)

266

492

518

550

Ø 15 (2x)

525

510

499

340

325

314

5598

Ø 7.5 (4x)

20 x 45

164

(230)

18 x 45°

Ø 19 (2x)

Ø 8 (4x)

280

200

254

266

492

518

550

524

200

R95

380

Ø 9.5 (4x)

400

370

R6 (4x) 25

920

950

25 x 45

210

400

370

320

Ø 13 (4x)

1558

1554

1540

1580

R9.5 (2x)

376

245

45 1500

1510

400

1st edition 07.2011 / ID no. 328 124 / Drawing no. A4491200SK23

䡲Enclosures

䡲Power Distribution

䡲Climate Control

䡲IT Infrastructure

䡲Software & Services

RITTAL GmbH & Co. KG

Postfach 1662 䡠 D-35726 Herborn

Phone +49(0)2772 505-0 䡠 Fax +49(0)2772 505-2319

E-mail: info@rittal.de 䡠 www.rittal.com

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