Pfannenberg DTT Series User manual

Operating Manual
Roof-mounted Cooling Unit
DTT series 6101 / 6201
Multi Controller (MC) – 230 V
Original instruction manual – Version 1.4, July 2022

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Operating Manual | Roof-mounted Cooling Unit | Multi Controller (MC) – 230 V | 086100023d 2/80
1About this manual .............................................................................................................................................................5
1.1 Use and safekeeping .....................................................................................................................................................5
1.2 Exclusion of liability........................................................................................................................................................5
1.3 Explanation of the notes ................................................................................................................................................6
1.4 Marking of contents........................................................................................................................................................7
1.4.1 Handling instructions ................................................................................................................................................7
1.4.2 Links and cross references ......................................................................................................................................7
2Safety..................................................................................................................................................................................8
2.1 Intended use ..................................................................................................................................................................8
2.2 Permissible usage conditions.........................................................................................................................................8
2.3 Foreseeable misuse.......................................................................................................................................................9
2.4 Duty of the operator .......................................................................................................................................................9
2.5 Terms of warranty........................................................................................................................................................10
2.5.1 Returning units .......................................................................................................................................................10
3Unit description ...............................................................................................................................................................11
3.1 Application description .................................................................................................................................................11
3.2 Scope of delivery .........................................................................................................................................................11
3.3 Ordering options ..........................................................................................................................................................11
3.4 Functional description ..................................................................................................................................................12
3.4.1 Air circuit ................................................................................................................................................................12
3.4.2 Filter adapter (option) .............................................................................................................................................13
3.4.3 Quick-change frame (option)..................................................................................................................................14
3.4.4 Flat duct system (option) ........................................................................................................................................15
3.4.5 Controller................................................................................................................................................................17
3.4.6 Refrigeration circuit ................................................................................................................................................19
3.4.7 Safety concept........................................................................................................................................................20
3.4.8 Condensate treatment............................................................................................................................................21
3.4.9 Energy-saving mode ..............................................................................................................................................23
3.4.10 Multimaster function ...............................................................................................................................................24
3.5 Type plate ....................................................................................................................................................................25
3.6 Signs and symbols on the unit .....................................................................................................................................26
3.7 Technical data..............................................................................................................................................................27
3.7.1 Refrigeration circuit ................................................................................................................................................27
3.7.2 Electrical data.........................................................................................................................................................27
3.7.3 Dimensions ............................................................................................................................................................28
3.7.4 Other unit data........................................................................................................................................................28

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4Assembly and initial commissioning.............................................................................................................................29
4.1 Safety information ........................................................................................................................................................29
4.2 Transport .....................................................................................................................................................................30
4.2.1 Transporting the cooling unit ..................................................................................................................................30
4.2.2 Crane transport ......................................................................................................................................................31
4.3 Storage ........................................................................................................................................................................32
4.4 Unpacking....................................................................................................................................................................32
4.5 Assembly .....................................................................................................................................................................33
4.5.1 General ..................................................................................................................................................................33
4.5.2 Making the assembly cut-out for the DTT-cooling unit ...........................................................................................33
4.5.3 Sticking on the surface seal ...................................................................................................................................35
4.5.4 Mounting the cooling unit on the switch cabinet .....................................................................................................36
4.5.5 Assembly with quick-change frame (option)...........................................................................................................38
4.6 Electrical connection ....................................................................................................................................................42
4.6.1 Notes for connecting cables to the unit ..................................................................................................................42
4.6.2 Electrical circuit diagram – Multi-Controller (MC) ...................................................................................................43
4.6.3 Multimaster Control ................................................................................................................................................44
4.6.4 Door contact switch................................................................................................................................................45
4.6.5 Collective fault signal..............................................................................................................................................46
4.6.6 External temperature sensor TS2...........................................................................................................................47
4.6.7 Mains connection ...................................................................................................................................................48
4.6.8 Adapting the unit to the mains voltage ...................................................................................................................50
5Operation..........................................................................................................................................................................51
5.1 General functions.........................................................................................................................................................51
5.2 Multi-Controller (MC) operation....................................................................................................................................52
5.2.1 Carrying out menu settings ....................................................................................................................................52
5.2.2 Menu overview .......................................................................................................................................................53
5.3 Operation of the cooling unit ........................................................................................................................................54
5.3.1 Operating conditions ..............................................................................................................................................54
5.4 Service interface ..........................................................................................................................................................55
5.4.1 Connecting/removing the USB adapter ..................................................................................................................56
5.5 Test mode....................................................................................................................................................................57
6Service and maintenance ...............................................................................................................................................58
6.1 Safety information ........................................................................................................................................................58
6.2 General ........................................................................................................................................................................59
6.3 Maintenance schedule .................................................................................................................................................60
6.4 Maintenance work........................................................................................................................................................61
6.4.1 Cleaning .................................................................................................................................................................61

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7Rectification of operating faults.....................................................................................................................................67
7.1 General ........................................................................................................................................................................67
7.1.1 Error messages......................................................................................................................................................68
7.1.2 System messages..................................................................................................................................................71
8Decommissioning............................................................................................................................................................72
8.1 Temporary decommissioning.......................................................................................................................................72
8.2 Final decommissioning ................................................................................................................................................72
9Dismantling and disposal ...............................................................................................................................................73
9.1 Safety information ........................................................................................................................................................73
9.2 Dismantling ..................................................................................................................................................................74
9.3 Disposal .......................................................................................................................................................................75
10 Spare parts and accessories..........................................................................................................................................76
11 Index .................................................................................................................................................................................77

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1 About this manual
1.1 Use and safekeeping
NOTE
Read the manual before starting any work on the unit/plant.
Observe the following points:
• The manual is part of the unit and must always be available on the product and accessible to the operator. The
manual must be kept complete, close to the machine and accessible to the respective authorized persons.
• The unit can only be commissioned, operated and serviced properly with the help of this manual.
• This manual refers only to the product specified on the title page.
• This manual is subject to change in the course of technical progress.
• This manual is part of the scope of delivery.
• This manual is valid from transport until final disposal and must be observed.
• Always keep the manual in a legible condition.
• Leave the manual with the unit in the event of a resale.
• The unit can present unavoidable residual hazards for persons and property. Therefore, personnel must read,
understand and observe the manual before beginning any work. In addition, every person who works on and with
the unit in any way must be instructed and aware of the possible dangers.
• This manual is aimed only at instructed and authorized specialist personnel.
• The owner must ensure that all persons concerned have read and understood the manual before starting work.
• Illustrations in this manual serve for general understanding and can differ from the actual version.
1.2 Exclusion of liability
Pfannenberg is not liable for any errors in this documentation. Liability for indirect and direct damages that occur in connection
with the delivery or use of this documentation is excluded insofar as this is legally permitted.
Pfannenberg reserves the right to change this document, including the exclusion of liability, at any time without notice and is not
liable for any consequences of this change.

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1.3 Explanation of the notes
The warnings are indicated by signal words which express the degree of danger.
The warnings must be heeded to avoid accidents, injuries and property damages.
Explanation of the warnings in this manual:
DANGER
Brief description of the danger
The signal word DANGER indicates an imminent danger.
Failure to heed this warning will lead to severe injury or death.
WARNING
Brief description of the danger
The signal word WARNING indicates a possible danger.
Failure to heed this warning can lead to severe injury or death.
CAUTION
Brief description of the danger
The signal word CAUTION indicates a possible danger.
Failure to heed this warning can lead to minor to moderate injuries.
ATTENTION
Brief description
The signal word ATTENTION indicates possible property damages.
Failure to heed the warning can lead to damages to the unit or plant.
NOTE
The signal word NOTE indicates further information about the unit or its use.

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1.4 Marking of contents
1.4.1 Handling instructions
Handling instructions are indicated in this manual as follows:
Requirements
Requirements and additional warnings
Required tools and materials
Tools and materials required for handling
Procedure
1. <Handling steps>
2. …
– <Intermediate result / Further instructions>
3. …
<Final result>
1.4.2 Links and cross references
Links and cross references are indicated in this manual as follows:
• If this document is available in digital form, the links are interactive. A CLICK will bring you to the desired target.
– The button combination <ALT> + <Cursor left> always returns you to the starting point.
• The table of contents is also interactive.
Cross references (example)
For further information, see section "Links and cross references", page 7.

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2 Safety
2.1 Intended use
The Pfannenberg roof-mounted cooling units of the DTT-series are stationary cooling units for heat dissipation from switch
cabinets. The DTT-cooling units are mounted on the switch cabinet roof.
The cooling units have different cooling capacities. See the chapter "Refrigeration circuit", Page 27for exact capacity data.
The cooling units have a cut-out compatibility with air/air heat exchangers and air/water heat exchangers. The use of aluminum
filters, felt filters or bellows filters is possible with an additional adapter.
The cooling units are available with different controllers. Cooling units with a Standard-Controller (SC) or a Multi-Controller (MC)
are available. These controllers are control unit for setting refrigeration functions and operating data. They also enable readout
of system messages and diagnostic data.
The Multi-Controller (MC) is additionally equipped with a Multimaster function and an energy-saving mode.
• For detailed data of the controller, see chapter "Technical data", Page 27, "Electrical connection", Page 42and
"Operation", Page 51.
All Pfannenberg cooling units are RoHS compliant and free from:
• Silicone compounds
• PCT, asbestos, formaldehyde, cadmium
• Substances that cause wetting defects
2.2 Permissible usage conditions
• The permissible ambient air temperature of the DTT-cooling units is at +15°C to +55 °C (+59 °F to +131 °F).
• The permissible storage temperature of the DTT-cooling units may not exceed +70 °C (+158 °F).
• Operation of the DTT-cooling units is only permissible with stationary assembly and with the switch cabinets closed.

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2.3 Foreseeable misuse
The following points describe a foreseeable misuse of the unit:
• Use of the unit as a storage place, work platform.
• Attachment of transport aids.
• Installation in unsuitable locations.
• Outdoor operation.
• Operation outside of the permissible technical data. See section "Technical data".
• Operation without or with damaged sub-assemblies which serve for the safety of persons and the unit/plant.
• Use of cooling media not listed and approved in the "technical data".
• Cooling of media and objects not intended for operation of the unit.
• Blocking of the ambient air inlets and outlets by set down objects for example.
2.4 Duty of the operator
• The operator must ensure that the cooling units are only used for their intended purpose and that all hazards pertaining
to the life and health of users or third parties are avoided. The accident prevention guidelines and safety regulations must
also be observed.
• Unit faults must be responded to immediately.
• The owner must ensure that all users have read and understood this operating manual.
Non-compliance with this operating manual will void the warranty. The same applies if improper work has been carried out on
the unit by the customer and/or third parties without the consent of the manufacturer.

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2.5 Terms of warranty
ATTENTION
Loss of warranty!
Loss of warranty due to spare parts from other manufacturers.
• Only original parts are subject to quality control by the manufacturer.
• The use of spare parts from other manufacturers will lead to loss of warranty.
• Only use original manufacturer parts to ensure safe and reliable operation.
The warranty does not apply or shall expire in the following cases:
• Improper use of the unit.
• Non-compliance with the operating conditions or non-observance of the operating manual.
• Irregular maintenance of the cooling units.
• Damage due to failure to observe the maintenance recommendations.
• Damage to cooling units caused by dirty or blocked filters.
• Damage due to unauthorized opening of the refrigeration circuit.
• Modifications made to the unit or any change in the serial number.
• Transport damage or other accidents.
• Replacement of parts by unauthorized personnel.
2.5.1 Returning units
The following must be observed to assert warranty claims and to return the unit:
• Attach a precise description of the defect and the SRO (RMA) number assigned by Pfannenberg to the cooling unit.
• Enclose proof of purchase (copy of delivery note or invoice).
• Send the cooling unit with all supplied accessories, in original box or equivalent packaging, free of transport charges and
insured.
• Observe transport instructions, see section "Transport", Page 30.

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3 Unit description
3.1 Application description
WARNING
Risk of injury due to impermissible use of the units.
Improper use of units can lead to serious accidents.
• Only use cooling units in stationary operation.
The Pfannenberg roof-mounted cooling units of the DTT-series are designed for heat dissipation from switch cabinets. The
innovative arrangement of the climate circuits prevents a cold bridge to the switch cabinet,; the risk of condensate forming in the
switch cabinet is avoided.
The evaporator unit in the upper section of the cooling units guarantees trouble-free condensate separation without switch
cabinet contact.
• The cooling units operate with refrigerant that is very difficult to ignite and is not harmful to the ozone layer.
• The DTT-cooling units are only approved for stationary operation.
As cooling units of protection class IP 54, the cooling units are largely dust-protected.
Limitation: Dust can penetrate despite this under permanent exposure. The cooling units withstand splash water but not a
continuous water jet.
3.2 Scope of delivery
The scope of delivery consists of:
• DTT-cooling unit
• Brief operating instructions of the cooling unit
• Accessory kit: According to unit type - e.g. seal, fixing material, electrical plug connectors
• Special accessories if required (e.g. TS2-temperature sensor for cooling units with Multi-Controller (MC))
3.3 Ordering options
ATTENTION
Damage to the unit!
Damage to the unit due to non-genuine spare parts.
• Only original parts are subject to the manufacturer’s quality control.
• For safe and reliable operation, use only original parts of the manufacturer.
See chapter "Spare parts and accessories", Page 76for Pfannenberg part numbers for spare parts.
An optional extension by a filter adapter for different filter mats (felt filter, pleated filter and metal filter) is available.
DTT-cooling units offer the additional option of a quick-change frame. It allows easy, convenient replacement of the cooling
units. The cooling units have different sizes.
• For the Pfannenberg part numbers for accessory orders, see chapter "Spare parts and accessories", Page 76.

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3.4 Functional description
3.4.1 Air circuit
CAUTION
Risk of burns
Risk of burns due to high temperatures at the ambient air outlet. The air outlet can get very hot depending on the ambient
temperature.
• Do not hold any parts of the body directly in front of the ambient air outlet (A).
Front view View from below
Fig. 1: Air circuit switch cabinet DTT
A Ambient air outlet
B Ambient air inlet
C Hot air inlet (switch cabinet)
D Cold air outlet (switch cabinet)
1 DTT-cooling unit
G00027

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3.4.2 Filter adapter (option)
Fig. 2: Filter adapter on the cooling unit
For permanent protection of the external air circuit from contamination, the optional filter adapter (1) can be fitted with a filter
mat (2) at the air inlet (3) of the cooling unit.
The filter adapter (1) is simply clipped into the air inlet (3). Only one filter adapter per unit is needed. All filter types are suitable
for the adapter.
Order number Description
18310000151 Filter adapter, RAL 7035
18300000147 Felt filter (standard, dusty air without oil vapors)
18300000148 Pleated filter (longer life, dusty air without oil vapors)
18300000149 Aluminum filter (oily air)
Tab. 1: Order information filter adapters and filter mats
G00051

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3.4.3 Quick-change frame (option)
Fig. 3: Quick-change frame
DTT-cooling units (1) with quick-change frames (2) are quick and easy to assemble. The flexibility allows easy, convenient
replacement of the cooling units.
NOTE
Quick-change frames that are assembled with a “Performance-Cut” offer optimum colling unit performance at minimum
current consumption, see chapter "Dimensions of "Performance-Cut” unit cut-out", Page 34.
G00028

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3.4.4 Flat duct system (option)
WARNING
Danger of fire due to short-circuits
Formation of condensate in the switch cabinet can lead to a fire risk due to short-circuits.
Condensate can form on the flat duct system.
• Check the flat duct system in the switch cabinet regularly for condensate formation.
• Shut down the unit immediately and inform your superiors if condensate forms.
• Find and remedy the cause of the condensate formation (e.g. switch cabinet not sealed tightly).
Fig. 4: Flat duct system
The flat duct system (2) supports the air distribution in confined switch cabinets. It ensures optimized cooling unit capacity with
adapted current consumption. The flat duct system (2) is used with a PAD-frame (1).
G00029

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3.4.4.1 PAD-frame
Three different PAD-frames are provided for the flat duct system (see Fig. 5):
• DTT-cooling units 6101/6201 size 1 (500 W/1000 W): PAD-single-duct system with PAD-single-duct frame.
• DTT-cooling units 6301/6401 size 2 (1500 W/4000 W): PAD-dual-duct system with PAD-dual-duct frame.
• DTT-cooling units 6601/6801 size 3 (1500 W/4000 W): PAD-dual-duct system with PAD-dual-duct frame.
PAD-frame (single-duct system)
DTT-cooling units 6101/6201
PAD-frame (dual-duct system*)
DTT-cooling units 6301/6401
PAD-frame (dual-duct system*)
DTT-cooling units 6601/6801
Fig. 5: PAD-frame
* The PAD-dual-duct system requires the use of two PAD-air duct systems.
The DTT-cooling units need the following PAD-frames and the following PAD-air duct system:
Order number Designation Order number Designation
18315000005 DTT 6101/6201 PAD-frame (single-duct
system)
18315000002 PAD-air duct system*
18315000001 DTT 6601/6801 PAD-frame (dual-duct
system*)
18315000004 PAD-extension package
18315000000 DTT 6301/6401 PAD-frame (dual-duct
system*)
Tab. 2: Ordering information for PAD-systems
* The PAD-dual-duct system requires the use of two PAD-air duct systems.
G00030

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3.4.5 Controller
The controllers are control units for setting refrigeration functions and operating data. They allow readouts of system messages
and diagnostic data.
The controllers have a service interface at which different configurations are possible.
They also have a connection for collective fault signals.
Fig. 6: Control unit Multi-Controller (MC)
1 LED light
2 Control panel
3 BACK button
4 SCROLL UP button
5 SCROLL DOWN button
6 SET button
Operating/display element Function
LED light Indicates the operating mode:
Continuous light = fault-free / flashing = operating fault
Control panel
(4-digit)
Shows system information:
Temperature measuring unit, energy function, operating mode, system data, error number and
menu settings/menu items/menu level.
BACK button • Activation of the menu settings.
• Jump back to the next highest menu level.
SCROLL UP / DOWN button SCROLL UP / DOWN of the menu items or the display elements, in the current menu level.
SET button • Selection of the current menu item.
• Jump to the next lowest menu level.
Tab. 3: Operating and display elements on the Multi-Controller
G00018

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Cooling units with a Multi-Controller (MC) have a control unit with a green LED light and a control panel. The control unit is on
the unit cover.
Steady lighting of the green LED light when mains voltage is applied indicates fault-free operating mode. System information is
displayed on the control panel.
The following system information displays are possible:
Control panel System information
Display – Temperature (°C/°F) of the control sensor in normal operating condition.
Display – Execute stop mode. Door is open.
Alternating display with temperature and stop mode, for fault Er00.
Display: StoP Er00 Temperature.
Display - Execution of the energy function, is activated in energy-saving mode
Alternating display with temperature display (°C/°F).
Display - Error number when a fault occurs.
In case of a fault, error number (Er01-Er15) alternating with temperature display (°C/°F).
Exception error Er00: StoP Er00 Temperature.
Tab. 4: System information on the Multi-Controller
For details of error messages, see "Error messages", Page 68.

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3.4.6 Refrigeration circuit
Fig. 7: Refrigeration circuit
1 Compressor
2 Condenser
3 Expansion valve
4 Evaporator
5 Condenser (external)
6 Evaporator fan (internal)
7 Electronic control with temperature sensor
The cooling units consist of different components, see Fig. 7.
• The compressor (1) compresses the refrigerant with high pressure. The temperature rises.
• This heat is dissipated into the ambient air in the condenser (2). The refrigerant becomes liquid.
• The condenser fan (5) sucks in room air through the condenser (2) and discharges it into the ambient air.
• If the refrigerant passes through the expansion valve (3), there is a drop in pressure.
• In the evaporator (4), the refrigerant draws heat from the air inside the cabinet and evaporates it. The air inside
the cabinet is cooled and dehumidified.
• The evaporator fan (internal) (6) sucks in the air from inside the cabinet through the evaporator (4) and feeds it
back into the switch cabinet as cool air.
The cooling units are controlled by a temperature sensor (7). It measures the air inside the switch cabinet.
G00004

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3.4.7 Safety concept
WARNING
Risk of injury due to modified safety devices.
Non-functional, modified or defective safety devices lead to serious accidents.
• All modifications to the unit and especially the safety devices are prohibited.
• In case of defective safety devices, shut down the unit immediately and take it out of operation.
3.4.7.1 Safety devices
• The cooling units have a tested pressure switch in accordance with EN 12263. The pressure switch reacts to a pressure
increase in the refrigeration circuit by switching off automatically.
• The fans and compressors are protected against overloading and overheating. For example, the compressor is protected
against overspeeding.
3.4.7.2 Additional protection function
Only cooling units with antifreeze option.
• The compressors and fans switch off if there is a danger of freezing.
• The unit must be restarted to exit this switch-off function.