Baxi Senertec Dachs Pro 20 ST Installation instructions

Dachs Pro 20 ST
These instructions are intended for trained specialist sta.
Before commencing your work at the Dachs Pro 20 ST, read these instructions carefully.
In case of non-compliance, the warranty for any resulting damage will become void.
The safety instructions are particularly important.
Supplement to the translation of the
original German operating instructions
VW EcoBlue 2.0 - Generation 1.2 of iav
Article no. 14/4798.495.002 © Changes and errors reserved
Assembly, commissioning
and operation
Dachs Pro 20 ST
i
EN

Dachs Pro 20 ST
Applicable to: Assembly, commissioning and operation of Dachs Pro 20 ST with MSR Pro 20 ST
Article no. 14/4798.495.002
Baxi Commercial
Wood Lane
Erdington
Birmingham
B24 9QP
All rights reserved. The content of the present instructions is protected by copyright. Any form of duplication, even in
extracts, requires the written approval of Baxi SenerTec UK. The present instruction may not be copied, modied or saved
in any database whatsoever, be it electronically, mechanically or by any other means of recording. The publisher has the
sole right of use.
The right to changes and errors is reserved.

Dachs Pro 20 ST
Inhaltsverzeichnis
1 Introduction....................................................................................................................................................7
1.1 General information...............................................................................................................................................7
1.2 Additional documentation ...................................................................................................................................7
1.3 Symbols used ..........................................................................................................................................................8
1.4 Abbreviations..........................................................................................................................................................9
1.5 Responsibilities.......................................................................................................................................................9
1.5.1 Responsibilities of the installer.....................................................................................................................................................................9
1.5.2 Responsibilities of the operator.................................................................................................................................................................10
1.5.3 Responsibilities of the manufacturer.......................................................................................................................................................11
1.6 Homologations .....................................................................................................................................................12
2 Safety.............................................................................................................................................................13
2.1 General safety instructions.................................................................................................................................13
2.1.1 Structure of the general safety instructions..........................................................................................................................................13
2.1.2 Work on electric and electronic equipment .........................................................................................................................................14
2.1.3 Gas connection................................................................................................................................................................................................15
2.2 Intended use..........................................................................................................................................................15
2.3 Special safety instructions..................................................................................................................................16
2.3.1 Machine in running operation...................................................................................................................................................................16
2.3.2 Assembly and repair......................................................................................................................................................................................18
2.3.3 Servicing ............................................................................................................................................................................................................19
3 Technical specications ...............................................................................................................................20
3.1 Technical data........................................................................................................................................................20
3.1.1 Dachs Pro 20 ST overall system..................................................................................................................................................................20
3.1.2 Volkswagen EcoBlue 2.0 (Generation 1.2) CHP unit...........................................................................................................................21
3.1.3 MSR Pro 20 ST system controller ...............................................................................................................................................................22
3.1.4 2 × SE940 buer vessels ...............................................................................................................................................................................22
3.1.5 Frequency converter......................................................................................................................................................................................22
3.1.6 Accessories and communication ..............................................................................................................................................................22
3.2 Dimensions and connections.............................................................................................................................23
3.2.1 VW EcoBlue 2.0 (Generation 1.2) dimensions and connections....................................................................................................23
3.2.2 Buer vessel SE940 dimensions and connections..............................................................................................................................24
3.3 Circuit diagram......................................................................................................................................................26
4 Product description......................................................................................................................................27
4.1 Product information ............................................................................................................................................27
4.2 Operating principle..............................................................................................................................................28
4.3 Main components.................................................................................................................................................29
4.3.1 Dachs Pro 20 ST overall system..................................................................................................................................................................29
4.3.2 CHP unit (VW EcoBlue 2.0 - Generation 1.2)..........................................................................................................................................30
4.3.3 MSR Pro 20 ST...................................................................................................................................................................................................30
4.3.4 2 × SE940 buer vessels ...............................................................................................................................................................................30
4.3.5 Frequency converter......................................................................................................................................................................................30

Dachs Pro 20 ST
4.4 Control panel description ...................................................................................................................................31
4.3.6 MSR Pro 20 ST...................................................................................................................................................................................................31
4.4.1 CHP unit control panel..................................................................................................................................................................................32
4.5 Scope of delivery ..................................................................................................................................................34
4.6 Accessories and options......................................................................................................................................35
5 Prior to installation ......................................................................................................................................36
5.1 Installation regulations .......................................................................................................................................36
5.2 Installation requirements ...................................................................................................................................37
5.2.1 Installation height...........................................................................................................................................................................................37
5.2.2 Heating water requirements.......................................................................................................................................................................38
5.2.3 Heating installation and return temperatures .....................................................................................................................................39
5.2.4 Gas installation ................................................................................................................................................................................................39
5.2.5 Exhaust gas installation................................................................................................................................................................................40
5.2.6 Supply air apertures.......................................................................................................................................................................................40
5.2.7 Electric installation - Controller..................................................................................................................................................................40
5.3 Installation location requirements....................................................................................................................41
5.2.8 Dachs Pro 20 ST space requirements.......................................................................................................................................................41
5.3.1 Installation requirements.............................................................................................................................................................................43
5.3.2 Ambient conditions: ......................................................................................................................................................................................43
5.3.3 Installation requirements.............................................................................................................................................................................44
5.4 Transport................................................................................................................................................................45
5.4.1 Access to the installation location............................................................................................................................................................45
5.4.2 CHP unit transport..........................................................................................................................................................................................45
5.4.3 SE940 buer vessel transport to the installation location ...............................................................................................................46
5.5 Unpacking and preparations .............................................................................................................................46
5.6 Connection diagram ............................................................................................................................................47
6 Installation....................................................................................................................................................50
6.1 General information.............................................................................................................................................50
6.2 Assembly................................................................................................................................................................50
6.2.1 CHP installation ...............................................................................................................................................................................................50
6.2.2 Partial assembly of the CHP cladding......................................................................................................................................................50
6.2.3 Assembly of the MSR Pro 20 ST at the CHP ...........................................................................................................................................51
6.2.4 SE940 buer vessel installation .................................................................................................................................................................52
6.2.5 Frequency converter control box assembly..........................................................................................................................................55
6.3 Preparations ..........................................................................................................................................................55
6.4 Hydraulic connection...........................................................................................................................................56
6.5 Solar component connection.............................................................................................................................63
6.6 Cooling circuit connection..................................................................................................................................63
6.7 Gas connection .....................................................................................................................................................64
6.8 Oil supply connection..........................................................................................................................................67
6.9 Exhaust gas/supply air system...........................................................................................................................68
6.9.1 Exhaust gas system ........................................................................................................................................................................................69

14/4798.495.002 | 5
Dachs Pro 20 ST
6.9.2 Exhaust gas line dimensioning base........................................................................................................................................................70
6.9.3 Exhaust gas line - DN80 package..............................................................................................................................................................71
6.9.4 Exhaust gas line - DN100 (DN80) duct mounting...............................................................................................................................72
6.9.5 Exhaust gas line - DN100 (DN80) external wall....................................................................................................................................73
6.10 Electrical connection............................................................................................................................................74
6.10.1 CHP grid connection (CHP unit) ................................................................................................................................................................ 77
6.10.2 Electrical connection of the frequency converter to the CHP........................................................................................................78
6.10.3 Connection of the CO sensors to the CHP.............................................................................................................................................79
6.10.4 MSR Pro 20 ST grid connection..................................................................................................................................................................79
6.10.5 Connections in the MSR Pro 20 ST............................................................................................................................................................80
6.10.6 Dachs Pro 20 ST equipotential bonding.................................................................................................................................................86
6.10.7 Heating emergency switch connection .................................................................................................................................................87
6.11 Filling the unit .......................................................................................................................................................88
6.12 Finishing work.......................................................................................................................................................89
7 Commissioning.............................................................................................................................................90
7.1 General information.............................................................................................................................................90
7.2 Check list prior to commissioning.....................................................................................................................91
7.3 Commissioning procedure .................................................................................................................................94
7.4 Gas supply settings ..............................................................................................................................................95
7.5 Oil supply settings................................................................................................................................................95
7.6 Commissioning settings......................................................................................................................................95
7.6.1 Service level selection and start of MSR Pro 20 ST commissioning..............................................................................................95
7.6.2 Menu sequence during MSR Pro 20 ST commissioning ...................................................................................................................95
7.6.4 MSR Pro 20 ST settings in menu 8/1 Date/time �������������������������������������������97
7.6.3 MSR Pro 20 ST settings in menu 1/7 Dachs data ������������������������������������������97
7.6.5 MSR Pro 20 ST settings in menu 1/8 Dachs Pro 20 ST location information ����������������97
7.6.6 MSR Pro 20 ST settings in menu 11/2 Service tel�-no� �����������������������������������98
7.6.7 MSR Pro 20 ST settings in menu 11/6/2/20 Conrm commissioning ���������������������������98
7.6.8 Advanced MSR Pro 20 ST parameter settings.......................................................................................................................................98
7.6.9 Advanced CHP parameter settings ..........................................................................................................................................................99
7.7 Finishing work.......................................................................................................................................................99
7.7.1 Commissioning protocol..............................................................................................................................................................................99
7.7.2 Operator brieng............................................................................................................................................................................................99
8 Operation....................................................................................................................................................100
8.1 General information.......................................................................................................................................... 100
8.2 Control panel...................................................................................................................................................... 100
8.2.1 MSR Pro 20 ST control panel and menu structure............................................................................................................................100
8.2.2 CHP control panel and menu structure................................................................................................................................................102
8.3 Start-up................................................................................................................................................................ 103
8.4 Shutdown............................................................................................................................................................ 103
8.5 Frost protection ................................................................................................................................................. 103

Dachs Pro 20 ST
9 Settings .......................................................................................................................................................104
9.1 List of parameters.............................................................................................................................................. 104
9.2 Setting parameters............................................................................................................................................ 104
9.3 Reading out operating data ............................................................................................................................ 104
10 Maintenance ...............................................................................................................................................105
10.1 General information.......................................................................................................................................... 105
10.2 Maintenance signals ......................................................................................................................................... 105
10.3 Regular maintenance........................................................................................................................................ 106
10.4 Repair................................................................................................................................................................... 106
11 Troubleshooting.........................................................................................................................................106
11.1 Error codes .......................................................................................................................................................... 106
11.1.1 MSR Pro 20 ST error codes.........................................................................................................................................................................106
11.1.2 CHP error codes.............................................................................................................................................................................................107
11.2 Error memory ..................................................................................................................................................... 107
11.2.1 MSR Pro 20 ST error memory....................................................................................................................................................................107
11.2.2 VW EcoBlue 2.0 (Generation 1.2) error memory................................................................................................................................107
11.3 Error nding........................................................................................................................................................ 107
12 Decommissioning.......................................................................................................................................108
12.1 Decommissioning procedure.......................................................................................................................... 108
12.2 Recommissioning .............................................................................................................................................. 110
13 Spare parts..................................................................................................................................................110
13.1 General information.......................................................................................................................................... 110
13.2 Spare parts overview ........................................................................................................................................ 110
13.3 Spare parts list.................................................................................................................................................... 111
13.4 Sources of supply............................................................................................................................................... 111

Dachs Pro 20 ST
1 Introduction
Carefully read these instructions before starting any work. The safety instructions are particularly important.
These instructions contain, among other things:
●The structure and individual modules of the Dachs Pro 20 ST overall system.
●Additional information on assembly of the Dachs Pro 20 ST overall system and the necessary preconditions
involved.
●Notes on safe handling of the system.
●Description of the MSR Pro 20 ST controller unit and its operation.
●Commissioning instructions for the Dachs Pro 20 ST overall system.
●Check list for assembly and commissioning of the Dachs Pro 20 ST overall system.
1.1 General information
These instructions describe assembly, commissioning and operation of the Dachs Pro 20 ST overall system with the MSR Pro
20 ST controller unit.
These instructions are intended for authorised specialist sta assigned with assembly, commissioning and service,
maintenance and repair of the VW EcoBlue 2.0 (Generation 1.2) and is a supplement to the existing VW documentation (iav).
These instructions serve installers as a “guideline”and additional documentation for complete installation of the Dachs Pro
20 ST overall system. For this reason, some chapters refer to the original VW operating instructions (iav).
The operator of the system may use these instructions as a source of information for necessary requirements and safe
operation of the unit.
Note:
The hydraulic and electrical diagrams are depicted as schematic diagrams only. Accessories
required for hydraulics, safety and control technology must be provided and installed according
to DIN, EN, and VDI regulations.
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Reference:
Before starting any work, please read the following applicable instructions and notes:
1.2 Additional documentation
●4798.492.xxx, Dachs Pro 20 ST planning documentation.
●4798.522.xxx, EcoBlue 2.0 (Generation 1.2) installation manual - iav documentation of VW.
●4798.530.xxx, EcoBlue 2.0 (Generation 1.2) user manual - iav documentation of VW.
●4798.494.xxx, MSR Pro 20 ST operation and conguration instructions.
●4798.497.xxx, MSR Pro 20 ST brief instruction.

14/4798.495.0028 | Introduction
Dachs Pro 20 ST
●4798.529.xxx, Dachs Pro 20 ST customer information.
●4798.399.xxx, SenerTec information brochure on heating water treatment.
●4798.496.xxx, GSM modem for Dachs Pro 20 ST with MSR Pro 20 ST.
●4798.499.xxx, Analogue modem module for Dachs Pro 20 ST with MSR Pro 20 ST.
●FAQ on Dachs Pro 20 ST
Attention:
This symbol warns against material and environmental damage.
!
Note:
This symbol highlights important additional information.
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Reference:
This symbol highlights important documents.
Attention! Danger:
This symbol warns against the risk of personal injury.
1.3 Symbols used
The following symbols are used throughout the entire instructions. This symbol serves as a warning and highlights general
hazards, necessary measures or helpful notes.
●This symbol marks lists.
►This symbol indicates actions to be taken.
1. Numbered lists mark action steps the order of which is important.
The following symbols and typographic distinctions are used in this document:
Symbols:
Typographic distinctions:
●Commands and functions are displayed in Courier New.
●File names and save paths are displayed in italics..
●Warnings, notes, references, tips and emphases are displayed in bold letters.
internal cross-reference

14/4798.495.002 Introduction | 9
Dachs Pro 20 ST
1.4 Abbreviations
1.5 Responsibilities
DVGW Deutscher Verein des Gas- und Wasserfaches
[German association of the gas and water industry]
AC Alternating current
FeuVO Feuerungsverordnung
[German ordinance on ring installations]
Oh Operating hours
GS Gas supplier CHP Combined heat and power generation
(here also: CHP unit)
CHP Combined Heat and Power CAN Controller Area Network
AEGS Air-exhaust gas system CO Carbon monoxide
STB Safety temperature limiter DC Direct current
TCR Technical connection requirements dB(A) Sound pressure level with A-weighting
TI air Technical instructions on air pollution control EGS Electronic gas safety controller
TRGI Technical regulation for gas installations EVU Energy provider
DNO Distribution network operator IP International Protection
F1-F7 Sensors F1 - F7 KFE Boiler lling and discharge valve
PWM Pulse width modulation (pump signal) PSI Buer vessel interface
1.5.1 Responsibilities of the installer
Disassembled transport as well as assembly, commissioning, service, maintenance and repair of the Dachs Pro 20 ST may
only be carried out by authorised and certied specialist sta. Product training carried out by SenerTec or by a training
institution commissioned by SenerTec is a minimum requirement. All work on the electrical equipment may only be carried
out by trained electricians. Please also note the following:
●Before commencing any work, carefully read all provided instructions.
●During assembly and connection of the unit, adhere to the applicable regulations and standards.
●Check the unit prior to commissioning.
●Instruct the operator on how to operate the unit.
●Inform the operator about the necessity of regular maintenance and the consequences of any non-observance.
●Submit all documents supplied to the operator.
Reference:
Please observe the requirements and contents of the iav Documentation of VW in particular.
Attention:
Initial commissioning may only be implemented by the SenerTec customer service in cooperation with the VW
customer service.
!

14/4798.495.00210 | Introduction
Dachs Pro 20 ST
1.5.2 Responsibilities of the operator
The operator is obliged to provide the necessary constructional requirements for assembly and commissioning as well as for
safe and intended use of the systems.
Furthermore, the operator is obliged and solely responsible for the registration, notication and operation of the unit in
accordance with applicable regulations.
The installer is obliged to adhere to the national laws, regulations and standards of the respective country of the installation
location. Among others, these include the following:
●The provisions of the applicable building law.
●The re protection regulations.
●The technical requirements for the gas supply connection.
●The safety instructions in accordance with DIN, DVGW, VDE, TAB and the EU.
●Stipulations for the erection of power plants with a nominal voltage of up to 1000V.
●The operation of electrical units.
Note:
Outside of Germany, apart
from national regulations, the
international standard IEC 60364
Electrical Installation of Buildings is to
be complied with.
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Notication and authorisation obligation
Global and local regulations and TCR (technical connection requirements) of:
●Electric utility/distribution network operators (DNO)
●Gas suppliers (GS)
●Water authorities
●Chimney sweeps
●Building inspection
●Main customs oce
are to be observed with regard to registration obligations. In case of technically justiable deviations from these local
regulations, an approval by the responsible supplier is to be obtained before installing the Dachs Pro 20 ST.
Prior to commissioning:
●A leakage test of the gas duct according to TRGI must be carried out.
●The exhaust gas system is to be approved by the responsible master chimney sweep, i.e. the authority responsible
for inspecting gas installations (e.g. in the case of shared chimneys).
●A frost-protected operation of the unit is to be ensured. This means that suitable frost protection measures
adapted to the ambient conditions have to be implemented.
●It is to be ensured that the heating water quality complies with the required specications of the manufacturer.
●It is to be ensured that the fuel corresponds to the required gas category.

14/4798.495.002 Introduction | 11
Dachs Pro 20 ST
1.5.3 Responsibilities of the manufacturer
Reference:
The declaration of conformity, certicates, approvals and manufacturer declarations on the Dachs Pro
20 ST can be found in the operator documentation folder or in the iav Documentation of VW.
Note:
The Dachs Pro 20 ST with its capacity is not subject to the German TI-air
(<1MW) and does therefore not require any authorisation. As is the case
for heating boilers of this size, there is no obligation of notication to the
responsible authorities. The specications of the applicable building code
[Landesbauordnung in Germany] shall be authoritative.
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Warranty:
Any warranty claim is subject to proper assembly as well as proper use/operation of the unit in accordance with applicable
SenerTec and VW instructions as well as regular maintenance by trained and authorised specialists only.
Disclaimer of warranty:
In particular for damage which cannot be directly or indirectly traced back to the manufacturer, for example:
●Incorrect planning and assembly (e.g. fuel supply, hydraulic and electrical connections, exhaust gas evacuation).
●Commissioning, maintenance and repair by buyers or third parties.
●Natural wear and tear.
●Incorrect, improper treatment, alteration, repair.
●Unsuitable operating media, non-admitted lubricants.
An application with the corresponding DNO is mandatory in Germany, for example. The stipulation of the required cos φ is
communicated to the applicant by the DNO once the connection has been approved (VDE-AR-N 4105).
Our Dachs products with CE mark have been developed and manufactured in accordance with the EC directives applicable
at the time of inspection. This is conrmed by the manufacturer of the product in an EC declaration of conformity and by
labelling the product with the CE mark.
Devices subject to the EC gas appliances directive have been tested and certied by the accrediting inspection authority
indicated next to the CE mark by means of the respective ID number.
Subject to technical modications.
The manufacturer will not assume any liability in the following cases:
●In case of non-compliance with the operating instructions of the unit (SenerTec as well as VW documentation).
●In case of insucient maintenance and/or servicing of the unit.
●In case of non-compliance with the installation instructions and requirements for the unit.
The majority of countries do not have harmonised EU directives and regulations for the installation and commissioning of
units in buildings. For this reason, when installing Dachs products, the responsible installation company has to adhere to the
national laws, regulations and standards of the respective country.

14/4798.495.00212 | Introduction
Dachs Pro 20 ST
1.6 Homologations
The Dachs Pro 20 ST with VW EcoBlue 2.0 (Generation 1.2) CHP unit complies with all applicable regulations of EU directives
and has been designed, constructed and inspected according to the standards specied in the inspection reports.
●Use of unsuitable heating water.
●Chemical, electro-chemical and electric inuences.
●Use of drinking water which does not correspond to the generally accepted rules of practice.
The warranty regulations of the General Terms and Conditions of SenerTec GmbH, Schweinfurt, in their respective current
version shall apply.
Reference:
The declaration of conformity, certicates, approvals and manufacturer declarations on the Dachs Pro
20 ST can be found in the operator documentation folder or in the iav Documentation of VW.
Standards and regulations:
●DVGW VP 109 - Turn-key combined heat and power plants.
●DIN 6280 - Parts 14 and 15 - Combined heat and power system (CHPS) with reciprocating internal combustion
engines.
●DIN V 19250 - Basic Safety Considerations for control and instrumentation technology equipment.
●DIN EN 298 - Automatic gas burner control systems for gas burners and gas burning appliances with or without
fans.
●DIN EN 60730-1 /-2-5 - Automatic electrical controls for household and similar use.
●DIN EN 303-1 - Heating boilers with forced draught burners.
●DIN EN 60335-1 - Household and similar electrical appliances - Safety.
●DIN 4702 - Part 2 - Central heating boilers; test code.
●DIN V VDE 0126 - Automatic disconnection device between a generator and the public low-voltage grid.
●DIN EN 60068-2-1 / -2 / -30 - Environmental testing.
●DIN EN 61000-3-2 /-3 and DIN EN 61000-4-2 /-3 /-4 /-5 /-6 /-11 - Electromagnetic compatibility.
●DIN EN 61810-1 - Electromagnetic compatibility.
●DIN EN 60947-5-1 - Low-voltage switchgear and controlgear.
●DIN EN 61558-2-4 - Safety of transformers, reactors, power supply units and similar products for supply voltages
up to 1100 V.
●VDE-AR-N 4105 - Generator units with low-voltage distribution networks - Technical minimum requirements for
generator units to be connected to and operated in parallel with low-voltage distribution networks.
●DIN V VDE V 0124-100 - Grid integration of generator plants - Low-voltage - Test requirements for generator units
to be connected to and operated in parallel with low-voltage distribution networks.
●DIN EN 50438 - Requirements for micro-generating plants to be connected in parallel with public low-voltage
distribution networks.
●DIN EN 82079 - Preparation of instructions for use - Structuring, content and presentation - Part 1: General
principles and detailed requirements.
●DIN VDE 0100 - Erection of low voltage installations - List of relevant standards and transitional dispositions.

14/4798.495.002 Safety | 13
Dachs Pro 20 ST
Note:
In order to integrate the CHP technology into the
buildings, standards/directives such as TRGI, TRF,
TRWI, VDI 2035 are to be observed.
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2 Safety
2.1 General safety instructions
2.1.1 Structure of the general safety instructions
Danger
Danger symbols Information on type and source of danger.
Explanation and indication of the consequences
of the risk.
• Information on avoiding the risk.
In case of emergency: Recommended
behaviour in case of emergency.
This chapter describes the general risks resulting from working with the Dachs Pro 20 ST as well as measures for preventing
hazardous situations and how to react in the event of an accident.
All work on the unit, such as assembly, commissioning, servicing and repair, may only be carried out by certied and
authorised specialist sta.
The unit has been designed in accordance with the statutory regulations applicable at the time of delivery and incorporates
state-of-the-art safety technology. Any potential residual hazards are indicated by safety warnings and described in these
instructions.
Please note the safety warnings attached to the machine. The machine may only be operated if all safety equipment is in
place. Hazardous areas between the unit and equipment on site have to be secured. Regularly check all safety equipment,
warning systems and automatic shutdowns.
Before initial commissioning, the exhaust gas system including safety equipment (e.g. CO sensors) is to be inspected for
eciency by a specialist engineer. Before commissioning, the electrical connections are to be checked by a certied specialist
engineer. After any alteration to the unit including modications of electrical or hydraulic connections, the inspection has
to be repeated.
The safety warnings highlight special risks occurring when handling combined heat and power units. Such risks may occur
when operating a combustion engine (heat, moving parts, exhaust gas, noise) in connection with electrical equipment
(danger of electrocution).
Reference:
Please particularly observe standards, guidelines, regulations and legal requirements
additionally specied in the iav documentation relevant for planning and installation.
Reference:
Please particularly observe the safety requirements and contents of the iav Documentation of VW.

14/4798.495.00214 | Safety
Dachs Pro 20 ST
2.1.2 Work on electric and electronic equipment
When working on electric equipment, the
assembly and commissioning instructions as
well as the instructions on the replacement of
service and spare parts are to be adhered to.
For personal safety, the prescribed connection
requirements and precautions are to be
complied with.
Danger
Risk of electrocution.
Severe bodily harm or death may be the consequence.
• Before commencing any maintenance and repair, the
Dachs is to be de-energised.
• A risk of electrocution persists even if the power
generation of the unit has been interrupted.
• De-energise the supply lines at the fuses of the main and
sub-distribution.
• Secure de-energised supply lines against reactivation.
• Use a test device to ensure that the system has been de-
energised.
Seek medical assistance following an electric shock.
Attention! Danger:
Work on the electronic equipment
may only be carried out by
authorised specialist sta.
The following danger symbols are used:
General danger Danger due to moving parts Harmful substances
Electrical voltage / current Hot surface Corrosive substances
Explosion hazard Hot uids and fumes Environmental damage
Lack of oxygen Noise
In the head line of general safety instructions, the following elements are used:
 + Danger (red): Any non-compliance leads to death or severe injury.
 + Warning (orange): Any non-compliance may lead to death or severe injury.
 + Caution (blue): Any non-compliance may lead to personal injury.
 Caution (blue): Any non-compliance may lead to environmental and material damage.

14/4798.495.002 Safety | 15
Dachs Pro 20 ST
2.1.3 Gas connection
The stipulations of DVFG-TRF 2012 are to be
strictly adhered to.
A gas shut-o valve with thermal shut-o unit
(TSOU) must be installed.
Attention! Danger:
The gas line is a safety-relevant
component and may only
be mounted by authorised
specialist sta.
Danger
Risk of explosion caused by room air saturated with gas.
Danger of suocation caused by under-saturation of
breathing air.
Severe bodily harm or death may be the consequence.
• Immediately deactivate the unit as soon as you notice the
smell of gas.
• Avoid open ames, do not smoke, do not operate any
electrical switches or contacts.
• Interrupt the gas supply.
• Ensure fresh air supply.
• Check the connections and lines for leakage.
• Immediately repair any leakage.
• Notify the gas supplier if the leakage is upstream of the gas
meter.
In case of non-controllable gas leakage, leave the
hazardous area and notify the re services.
2.2 Intended use
Any other functions or applications beyond this are regarded as not intended. SenerTec GmbH shall not assume any liability
for any damage resulting from this unintended use. The operator shall bear the entire risk.
Attention! Danger:
The unit may only be operated according to its specied intended use.
During system testing, the Dachs Pro 20 ST may only be operated with specied modules and approved system
technology.
Any unintended use may lead to personal injury or damage to the machine.
The following situations are regarded as incorrect operation:
●Operation with system technology not recommended by the manufacturer.
●Operation with fuels other than those specied and approved.
●Operation with machine settings changed by the operator.
●Operation with supply connections changed by the operator.
●Operations under ambient conditions other than those approved.
The unit may only be operated according to its intended use as described in the present document.
Combined heat and power generation units (CHP), also referred to as micro CHP, are systems or units that work according
to the principle of combined heat and power generation to simultaneously generate electricity and heat. The Dachs Pro 20
ST works according to this principle. However, it is designed for decentralised utilisation and application of the generated
energies inside the building.

14/4798.495.00216 | Safety
Dachs Pro 20 ST
2.3 Special safety instructions
2.3.1 Machine in running operation
After being switched on, the machine starts automatically and parts are put in rotation. Among other things, the exhaust gas
ow contains nitrogen oxides and carbon monoxide. Engine components and the exhaust gas system heat up considerably.
If the machine is operated while the acoustic enclosure is open (e.g. for test purposes), the noise level is hazardous to health.
Danger
Danger of suocation caused by exhaust gas which has not
been discharged.
Severe bodily harm or death may be the consequence.
• Immediately deactivate the unit as soon as you notice the
smell of exhaust gas.
• Ensure sucient fresh air supply.
• Check the exhaust gas system for leakage.
• Immediately repair any leakage.
In case of any physical impairment, immediately contact
the emergency medical assistance service.
Warning
Danger of burns caused by hot surfaces.
Severe burns may be the consequence.
• Before commencing any work, wait for the machine to cool
down.
• Wear gloves.
Cool burnt areas and seek medical assistance for further
treatment of the wound.
Warning
Danger of burns caused by hot uids and fumes.
Severe burns may be the consequence.
• Please note that overpressure in the system may lead to hot steam
escaping from the safety valves.
• Please note that circulating uids (heating water, cooling water, solar
uid) heat up considerably.
• Wear gloves.
Cool burnt areas and seek medical assistance for further treatment
of the wound.

14/4798.495.002 Safety | 17
Dachs Pro 20 ST
Warning
Danger of accidents caused by missing safety equipment.
Unauthorised changes to the system may lead to severe injuries.
• Check the electrical and mechanical safety equipment
before operating the unit.
• Do not operate the machine if the ywheel cover is not
installed.
• Do not carry out any changes to the safety equipment.
In case of injury, immediately seek medical assistance.
Caution
Danger caused by machine noise.
Hearing impairment may be the consequence.
• Wear hearing protection when working on the running
machine.
Seek medical assistance if you notice any impairment to
your sense of hearing.

14/4798.495.00218 | Safety
Dachs Pro 20 ST
2.3.2 Assembly and repair
Some Dachs Pro 20 ST components exceed the maximum recommended load to be lifted by individual persons. These
include pre-mounted components on delivery as well as some spare parts. When working with heavy loads, lifting devices
are to be used and dicult to move parts to be secured.
Warning
Risk of injury due to sharp edges.
Cutting injuries may be the consequence.
• Always wear gloves when carrying sharp machine,
cladding and housing components.
Seek medical assistance after initial treatment of the
wound.
Caution
Danger caused by excessive weight of machine
components.
When working on the machine, the maximum lifting loads may
not be exceeded.
• Use lifting equipment.
• Work with others.
Seek medical assistance if you notice any impairment
due to heavy lifting.
Caution
Danger caused by insucient light at the workstation.
Increased risk of injury.
• Ensure that no lamps are damaged.
• Only work with sucient lighting.

14/4798.495.002 Safety | 19
Dachs Pro 20 ST
2.3.3 Servicing
When operating the Dachs Pro 20 ST, acidic condensate forms. Condensate and waste products from the neutralisation
process (e.g. when using the SenerTec neutralisation box) has to be handled appropriately. Unit-specic safety regulations
depend on the functional principle of the device type used.
Caution
Danger due to waste oil, lling and operating media.
Environmental damage may be the consequence.
• Waste oil, lling and operating media (such as glycol, acidic
condensate) is to be properly disposed of.
Warning
Danger of chemical burns caused by acids and alkaline
solutions.
Chemical burns may be the consequence.
• Wear protective glasses when transferring condensate.
• Wear gloves when handling the condensate.
• Condensate is to be properly disposed of.
Thoroughly rinse eyes with clear water. Rinse o exposed
skin surfaces with plenty of clear water. Seek medical
assistance for follow up treatment.
Reference:
Please particularly observe the safety requirements and contents of the iav
Documentation of VW concerning the EcoBlue 2.0 (Generation 1.2).
Attention:
The safety information specied in chapter 2 of these instructions are a rough overview of
potential safety risks at the Dachs Pro 20 ST overall system.
Please observe the detailed safety instructions in the individual chapters and applicable
documentation.

14/4798.495.00220 | Technical specications
Dachs Pro 20 ST
3 Technical specications
3.1 Technical data
The technical data refer to the Dachs Pro 20 ST overall system including Volkswagen EcoBlue 2.0 (Generation 1.2) CHP unit in
combination with the MSR Pro 20 ST system controller, 2 SE940 buer vessels and one frequency converter.
3.1.1 Dachs Pro 20 ST overall system
Reference:
The specied values serve as basis for projecting.
For the full technical data of the Dachs Pro 20 ST, please refer to the
Dachs Pro 20 ST technical data sheet, art. no. 4798.493.xxx.
Fig. 1: Dachs Pro 20 ST overall system
Tab.1: Technical data - Dachs Pro 20 ST overall system (excerpt)
Overall system general parameters
Operating mode Grid parallel operation
Fuel Natural gas (H/L) according to DVGW G 260
Gas appliance type B23P
Noise emission
(sound pressure level according to DIN 60804) < 50 dB (A)
Flow temperature - Dachs outlet connection max. 90 °C
Return temperature - Dachs inlet min. 30 °C, max. 70 °C
Ambient air temperature (installation site) min. 5 °C, max. 40 °C
Electrical connection 400 V AC / 50 Hz / cosφ = 0,95
Dimensions and weights
Length / Width / Height of CHP unit approx. 117 / 90 / 175cm
Length / Width / Height of CHP unit with MSR Pro 20 ST approx. 135 / 90 / 175cm
Empty weight of CHP unit approx. 800 kg
Diameter / Height 1 SE940 buer vessel approx. 100 / 212 cm
Weight 1 SE940 buer vessel (empty/lled) approx. 170 / 1110 kg
Overall system installation dimensions (L / W / H) approx. 310 / 240 / 220 cm (buer vessel length side)
approx. 340 / 210 / 220 cm (buer vessel broad side)