HDG Euro 30 User manual

hdg-bavaria.com
HDG Euro 30/40/45/50
Operation Manual

Operation Manual HDG Euro 30/40/45/50 - Content
3
Content
1 Notes on this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Structure of the operating manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3 Glossary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2 Safety notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1 Intended use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Basic system design principles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Basic principles for the content of the operating manual . . . . . . . . . . . . . . . . . . . . 8
Proper and improper operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2 Residual risks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.3 Warnings and safety symbols used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
2.4 Duty of information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3 Mode of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Front view of HDG Euro 30/40/45/50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Cross-section of HDG Euro 30/40/45/50. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Rear and side view of HDG Euro 30/40/45/50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
3.2 Functional description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Boiler HDG Euro 30/40/45/50. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Boiler and weather-compensated heating control HDG Control . . . . . . . . . . . .17
3.3 Technical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
3.4 Fuel quality requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Log wood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Wood chips. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Pressed wood briquettes in accordance with DIN EN ISO 17225-3. . . . . . . . . . .21
Recommended fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Permitted fuel in accordance with 1st Federal Emission
Control Ordinance (Germany) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
4 Planning and installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
4.1 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
4.2 Structural requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Furnace room. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Required room sizes and minimum clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
4.3 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Chimney . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Electrical system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Water. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
4.4 Hydraulic connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
4.5 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

Operation Manual HDG Euro 30/40/45/50 - Content
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4.6 Installing the heating system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Installing the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Removing transport safety device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Installing the HDG Control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Installing the HDG automatic ignition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
4.7 Connecting the chimney. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
4.8 Electrical system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
4.9 Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
4.10 Connecting the thermal safety device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
5 Commissioning the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.1 Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.2 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Switching on the heating system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Testing system components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Setting the primary air guide and the grate height for the respective fuel . . 42
6 Using the heating system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
6.1 Control unit for HDG Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
6.2 Switching on the heating system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Emergency heating switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Fuel selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6.3 Heating up the system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6.4 Performing a chimney sweep test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Before the test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
On the day of the test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
During the test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
6.5 Switching off the heating system for repair work . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
6.6 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
7 Cleaning and servicing the heating system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
7.1 Cleaning and servicing schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
7.2 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Generally applicable safety instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Cleaning tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Cleaning the fuel chamber and ash compartment . . . . . . . . . . . . . . . . . . . . . . . . 65
Inspecting the pneumatic springs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Cleaning the heat exchanger surfaces and combustion chamber . . . . . . . . . . 69
Cleaning the burner nozzle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Cleaning the flue gas pipe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Cleaning the lambda sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Cleaning the flue gas temperature sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Cleaning the primary air inlets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Cleaning the flue gas fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Clean air control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Operation Manual HDG Euro 30/40/45/50 - Content
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Inspecting the door seals for leaks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
Cleaning the ignition fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
8 Notes on dismantling and disposal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81
8.1 Dismantling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81
8.2 Disposal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82
9 Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83
10 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84

1 Notes on this manual – Introduction
6
1 Notes on this manual
1.1 Introduction
SAFE AND SIMPLE OPERATION This Operating manual contains important instructions on the boiler
HDG Euro 30/40/45/50
and how to operate it properly and safely. Following these
instructions helps to avoid dangers, prevent repair costs and
downtimes, maintain reliability and extend the life expectancy of the
heating system.
READING THE OPERATING
MANUAL
This Operating manual must be read and observed by everyone who
operates or works on the HDG Euro 30/40/45/50.
TECHNICAL CHANGES We continuously develop and improve our boilers. The information
in this edition was correct at the time of going to press.
We reserve the right to make changes which may then differ from the
technical details and illustrations in this Operating manual.
COPYRIGHT Written permission is required from HDG Bavaria GmbH for
reprinting, storage in a data-processing system or transmission by
electronic, mechanical, photographic or any other means, and for
copies or translations of this publication, in whole or in part.
GUARANTEE The terms and conditions of the guarantee of your (central-heating)
boiler can be found in the enclosed information sheet.
SYMBOLS USED In this Operating manual, the following designations and symbols
are used for particularly important information:
1. Instructions to the operator
2. Work through the steps in the sequence specified.
✓Result of the action described
✎Cross reference for more explanation
•List
–List

1 Notes on this manual – Structure of the operating manual
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1.2 Structure of the operating manual
The operating manual is structured as follows:
1.3 Glossary
Chapter This explains ...
1 Notes on this manual ... how to use this operating manual.
2 Safety notes ... everything on the subject of safety that you should consider
when using the heating system.
3 Mode of operation ... the structure and all of the features of the heating system.
4 Planning and installation ... how to properly plan and install the heating system.
5 Commissioning the system ... how the heating system is put into initial service.
6 Using the heating system ... how to properly operate the heating system.
7 Cleaning and servicing the
heating system
... how to clean the heating system and who is responsible for its
maintenance.
8 Notes on dismantling and
disposal
... what has to be considered when dismantling and disposing of
the heating system.
Table 1/1 - Structure of the operating manual
Term Explanation
Actuator This is a component that carries out a certain function in the
heating system, for example the thermal safety device (TAS).
Central module Pre-fabricated connection strip for electrical components
Flue gas fan Creates a vacuum inside the boiler and provides the boiler with air
for combustion.
HDG Control Boiler and heating system controller.
Lambda sensor Electrical component which monitors residual oxygen levels in the
flue gas.
Reload signal Electrical signal (in the form of an LED on the control unit) which
serves as a prompt to reload the fuel chamber.
Safety temperature limiter An automatic device that interrupts and locks the supply of energy
and combustion air when the maximum permissible boiler
temperature is reached. The energy supply or combustion air
supply can only be re-enabled after the boiler temperature has
fallen below a preset limit and has been reset by hand or by means
of a tool.
Sensor Monitors certain parameters (e.g. temperature) and sends them to
the control system for analysis.
Thermal safety device Safety device that allows cold water to flow through the safety
heat exchanger if the boiler becomes too hot.
Table 1/2 - Glossary

2 Safety notes – Intended use
8
2 Safety notes
2.1 Intended use
BASIC SYSTEM DESIGN PRINCIPLES
BASIC PRINCIPLES The heating system was built using state-of-the-art technology and
conforms to recognised safety regulations. Nevertheless, there is still
a risk of injury or death to users or bystanders, and of adverse effects
upon the heating system or upon other material goods. Have your
specialist heating company provide you with detailed
instructions on the operation of the heating system.
USING THE HEATING SYSTEM Only use the heating system when it is in perfect condition. Use it
properly, as intended, be aware of safety and hazards, and observe
the Operating manual. Have any faults which could impair safety
fixed immediately.
This device can be used by children over 8 years old and people with
reduced physical, sensory or mental capabilities or a lack of
experience and knowledge, provided they are supervised or have
been instructed on the safe use of the device and understand the
resulting risks. Children may not play with the device. Cleaning and
user maintenance must not be carried out by children without
supervision.
BASIC PRINCIPLES FOR THE CONTENT OF THE OPERATING MANUAL
SCOPE The content of this operating manual is intended exclusively for the
planning, installation and operation of the HDG Euro 30/40/45/50
boiler. The further implementation of applicable standards and
guidelines, for example regarding installation of the heating system
(pipework, etc.), is not part of this operating manual. HDG does not
assume any liability for this.
PROPER AND IMPROPER OPERATION
PURPOSE OF THE HEATING
SYSTEM
The HDG Euro 30/40/45/50 boiler is designed for the standard use of
burning untreated wood, for example in the form of split logs,
pressed wood briquettes and chippings, in water heating systems.
Any other application is considered improper use. The manufacturer
will accept no liability for any damage resulting from improper use.
The operator bears sole responsibility in such cases.
Proper use includes adherence to the installation, operation and
maintenance requirements specified by the manufacturer.

2 Safety notes – Residual risks
9
Modification of the specified operating values will affect the heating
system’s control programme and could lead to malfunctions. Only
trained maintenance and operating personnel may undertake
modifications to the operating values.
2.2 Residual risks
Despite all precautions, the following residual risks remain:
For more information on fuel, see chapter “3 Mode of operation”,
section “3.4 Fuel quality requirements”.
Caution!
Hot surfaces
Contact with the hot surfaces of the boiler (such as the flue gas
pipe) can result in burns. Even after the boiler is switched off, the
surfaces only cool down slowly.
Wait until the boiler has cooled down before touching non-
insulated components.
Danger!
Danger of asphyxiation due to carbon monoxide
If the boiler is in operation, carbon monoxide can be emitted
through the open doors or lids.
Always keep the doors and lids closed. Only open them when the
boiler has finished burning. Do not leave them open any longer
than necessary and never leave them open unattended.
Warning!
Danger of fire
When the heating system is in operation, open doors and lids
constitute a fire hazard. Furthermore, combustion residue (ash,
charcoal etc.) can reignite after being removed from the boiler.
Always keep the doors and lids closed. Only open them when the
boiler has finished burning. Do not leave them open any longer
than necessary and never leave them open unattended. Put the
annealed combustion residue in the ash pan of a non-flammable
and closable container.

2 Safety notes – Warnings and safety symbols used
10
2.3 Warnings and safety symbols used
The following warnings and safety symbols are used in this
Operating manual :
Danger!
Danger of explosion
A concentration of carbon monoxide that is too high can result in
an explosion.
Observe the flue draught requirement of the chimney.
Caution!
Risk of injury from automatically driven components
Working on the flue gas fan can lead to hand injuries due to the
moving parts.
When working on the flue gas fan, disconnect it from the mains.
Danger!
Electric shock
Working on live components (such as the central module) can result
in an electric shock.
Work on the live components may only be carried out by a qualified
electrician. Make sure the system is disconnected from the mains
and prevented from being switched on again.
Warning!
The boiler is under pressure.
Danger!
Dangerous electrical current or voltage
Work in areas marked with this symbol may only be performed by a
qualified electrician.
Warning!
Hazardous area
Working in areas marked with this symbol can lead to serious
injuries or to extensive material damage.

2 Safety notes – Warnings and safety symbols used
11
Caution!
Hand injuries can occur
Working in areas marked with this symbol can lead to hand injuries.
Caution!
Hot surfaces
Working in areas marked with this symbol can lead to burns.
Warning!
Danger of fire
Working in areas marked with this symbol can lead to a fire.
Danger!
Danger of asphyxiation due to lack of oxygen
When working in areas marked with this symbol, there is a danger
of asphyxiation due to high concentrations of carbon monoxide.
Warning!
Automatic start-up
Working in areas marked with this symbol can lead to injuries due
to automatic start-up.
Danger!
Danger of explosion
A concentration of carbon monoxide that is too high can result in
an explosion.
Warning!
Danger from suspended loads
Working in areas with this symbol may involve danger from falling
objects.
Important!
Frost danger
Only install the heating system in a frost-proof room.

2 Safety notes – Duty of information
12
2.4 Duty of information
READING THE OPERATING
MANUAL
Any person performing tasks on this system must read the Operating
manual prior to beginning work, particularly the chapter “2 Safety
notes”.
This is especially important for persons who only occasionally work
on the heating system, for example when cleaning or servicing it.
The Operating manual must always be kept readily accessible at the
place where heating system is installed.
Instructions regarding disposal
Additional information for the operator

3 Mode of operation – Overview
13
3 Mode of operation
3.1 Overview
FRONT VIEW OF HDG EURO 30/40/45/50
1 Control unit HDG Control Touch
2 Fuel chamber door
3 Fuel chamber door locking device
4 Actuator primary air
5 Ash door
6 Upright grate flap
7 Fly ash door
8 Actuator secondary air
9 Immersion sleeve cover cap for return temperature sensor
Figure 3/1 - Front view of HDG Euro 30/40/45/50
1
3
2
75
4
8
6
9

3 Mode of operation – Overview
14
CROSS-SECTION OF HDG EURO 30/40/45/50
1 Cleaning shaft lid
2 Safety heat exchanger
3 Flue gas deflector plate
4 Heat exchanger surfaces
5 Secondary combustion chamber with chamber stones
6 Burner nozzle
7 Flue ash compartment
8Ashcompartment
9Flatgrate
10 Fuel chamber
11 Primary air inlets
12 Pneumatic with safety stop
13 Pneumatic spring
Figure 3/2 - Cross-section of HDG Euro 30/40/45/50
13
8
6
5
4
3
2
1
11
10
12
7
9

3 Mode of operation – Overview
15
REAR AND SIDE VIEW OF HDG EURO 30/40/45/50
1 Flue gas temperature sensor
2STLreleasebutton
3 Lambda sensor
4 EM4 expansion module (optional)
5Centralmodule
6 Flue pipe connection 180 mm
7Fluegasfan
8 Return connection (DN 32 inside thread)
9 Filling/draining connection (DN 15 IG)
10 Fly ash door
11 Ignition fan (only in connection with HDG automatic ignition)
12 Differential pressure switch (only in connection with HDG
automatic ignition)
13 Supply connection (DN 32 inside thread)
14 Immersion sleeve cover cap for flow/return and STL sensors
15 Safety heat exchanger outlet (DN 20, inside thread)
16 Safety heat exchanger inlet (DN 20, inside thread)
17 Connection of immersion sleeve for thermal safety device (DN 15
inside thread)
Figure 3/3 - Rear and side view of HDG Euro 30/40/45/50
14
15
16
17
8
6
5
3
1
7
9
2
13
12
11
4
10

3 Mode of operation – Functional description
16
3.2 Functional description
BOILER HDG EURO 30/40/45/50
GENERAL INFORMATION The HDG Euro 30/40/45/50 is a special boiler for the firing of wood up
to 50 cm in length. The HDG Control Touch system regulates the
combustion and output as well as the weather-compensated
heating. The HDG Euro 30/40/45/50 boiler and the HDG Control
Touch system are harmonised with one another and form a
functional unit. This enables wood to be converted into heat energy
in an environmentally sound and convenient manner.
COMBUSTION PROCESS
Inside the HDG Euro 30/40/45/50 boiler, fuel which has been
manually placed in the fuel chamber (1) and ignited is degassed
through the addition of primary air.
The resulting wood gas is mixed with secondary air in the
combustion chamber (2) where it is burnt off.
Ashes are collected in the large ash compartments (4) for
combustion ash and fly ash.
The air necessary for combustion is supplied as required via the flue
gas fan (5) and two actuators with metering mechanisms (3).
Figure 3/4 - Boiler HDG Euro 30/40/45/50
1
7
53
6
2
4

3 Mode of operation – Functional description
17
The lambda sensor (6), the boiler temperature sensor and the flue
gas temperature sensor (7) are used to do the following:
•To continuously monitor the firing
•To adjust the boiler output
•To minimise emissions
•To optimise boiler efficiency
BOILER AND WEATHER-COMPENSATED HEATING CONTROL HDG
CONTROL
BOILER CONTROL UNIT The HDG Control boiler control unit is the electronic hub of the
boiler. It consists of the ready-to-use central module and control unit
HDG Control Touch on the fuel chamber door of the boiler. Using the
control unit, you can regulate the boiler and call up information on
the current process.
HEATING CIRCUIT CONTROL The HDG Control controls the entire energy management of the
heating system including the following, depending on the version:
•Accumulator management
•Weather-compensated heating circuits
•Domestic hot water heating
•Peak load boiler control
•Local heating transfer (mains pump)
•Solar system for hot water and support of the heating system
✎For a description of the HDG Control boiler and weather-
compensated heating control, refer to the “HDG Control”
operating manual.

3 Mode of operation – Technical data
18
3.3 Technical data
Type of boiler HDG Euro 30 HDG Euro 40 HDG Euro 45 HDG Euro 50
Performance data (measured according to DIN EN 303-5)
Nominal thermal power 30 kW 40 kW 45 kW 48 kW
Minimum thermal power - 30 kW
Boiler efficiency at nominal thermal
power
92.6 % 92.3 % 92.1 % 92.0 %
Electrical power consumption at
nominal thermal power 94 W 125 W 145 W 157 W
Electrical connection:
•Voltage
•Frequency
•Back-up fuse
AC 1x230 V
50 Hz
10 A
General boiler data
Boiler class 5
Maximum permissible operating
pressure
3 bar
Maximum supply temperature 95 °C*
Minimum return temperature 60 °C
Water capacity 178 l
Fuel chamber capacity 220 l
Weight (net) 979 kg / 1029 kg with scale liner
Planning data for flue calculation (DIN EN 13384-1)
Flue gas temperature (Tw) at
•Nominal thermal power
•Minimum thermal power
140 °C
140 °C
160 °C
140 °C
170 °C
140 °C
180 °C
140 °C
Flue gas mass flow at
•Nominal thermal power
•Minimum thermal power
0.0160 kg/s
0.0160 kg/s
0.0220 kg/s
0.0160 kg/s
0.0240 kg/s
0.0160 kg/s
0.0260 kg/s
0.0160 kg/s
CO2content at nominal thermal
power
16.4 % 16.7 % 16.8 % 16.9 %
CO2content at lowest thermal
power
14 %
Flue draught requirement (Pw) 13 Pa 14 Pa 15 Pa
Diameter flue pipe connection 180 mm
Height at middle of the flue gas
pipe connection
1106 mm
Water-side connections
Supply and return connections
(bushing)
DN 32, inside thread
Safety heat exchanger connections
(bushing)
DN 20, inside thread
Connection for filling/draining
(bushing)
DN 15, inside thread
Recommended pipe dimensions
(minimum)
DN 32
Table 3/1 - HDG Euro 30/40/45/50 technical data

3 Mode of operation – Fuel quality requirements
19
*Maximum operating temperatures of up to 110 °C can also briefly occur.
3.4 Fuel quality requirements
The HDG Euro 30/40/45/50 boiler is designed for the standard use of
burning untreated wood in the form of logs, wood chips, shavings
and pressed wood briquettes.
LOG WOOD
Essential criteria are the length, diameter and water content of the
fuel.
LENGTH AND DIAMETER For the log wood boiler HDG Euro 30/40/45/50, firewood with a
length of up to 50 cm (L50) can be used. The maximum diameter of
the firewood is specified as D15 (diameter of maximum 15 cm).
The firewood must be split at least once so as to provide an optimal
surface for gasifying the wood. The major proportion of the firewood
should measure between 8 and 12 cm in diameter.
WATER CONTENT When selecting fuel, note that the calorific value of the wood is
primarily dependent on the water content. The more water
contained in the wood, the smaller the calorific value, since the water
vaporises in the course of the burning process and thereby
consumes heat. This leads to a decreased efficiency and thus to
higher fuel consumption. A higher water content in the fuel also
Water-side resistance at nominal
thermal power
•10 K
•20 K
2400 Pa
640 Pa
Other information
Burning duration per filling with
fuel in accordance with fuel
recommendations
Beech:
up to 7 h
Spruce:
up to 6 h
Beech:
up to 6 h
Spruce:
up to 5 h
Beech:
up to 5 h
Spruce:
up to 4 h
Sound pressure level < 70 dB(A)
Min. air inlet cross section 150 cm2
Type of boiler HDG Euro 30 HDG Euro 40 HDG Euro 45 HDG Euro 50
Table 3/1 - HDG Euro 30/40/45/50 technical data
With regard to the quality standards for solid fuel the DIN EN ISO
17225 “Biogenic solid fuel - fuel specifications and classes -
classification of wood chips” applies.
•Part 5 “Classification of log wood”
•Part 4 “Classification of wood chips”
•Part 3 “Classification of wood briquettes”
In accordance with this standard, the properties of fuels that can be
used with the HDG Euro 30/40/45/50 are specified below in more
detail.

3 Mode of operation – Fuel quality requirements
20
results in a steadily decreasing output of the (central-heating) boiler,
greater amounts of ash and smoke, as well as making it increasingly
unfit for storage. In addition, this can lead to extensive tarring of the
boiler, the flue pipe and chimney, and cause a chimney fire.
Logs should therefore be split before they are cured. This is done in
order to achieve a water content which makes them suitable for
burning within a reasonable amount of time (approx. two years).
The maximum permissible water content of log wood for the HDG
Euro 30/40/45/50 is 20% (M20).
For technical considerations, a representative calorific value is
selected depending on water content. For burning that is both
economical and low on emissions, the calorific value should not be
less than 4 kWh/kg.
WOOD CHIPS
Essential criteria for the definition of the property classes are particle
size, moisture content and ash content of the fuel.
PARTICLE SIZE In accordance with DIN EN ISO 17225-4, the fuel specifications for
wood chips are classified in P45S. The numeric value of the P class
refers to the size of the wood chips in mm, which fit through a
circular mesh with the indicated sieve opening size.
•P45S
For HDG Euro 30/40/45/50, wood chips classified in the P45S
category or larger can be used as fuel.
WATER CONTENT The water content in accordance with DIN EN ISO 17225-4 for
property class A1 with M10 (≤ 10 %) or M25 (≤ 25 %) differs here from
the water content for property class A2 with M35 (≤ 35 %). The
maximum permissible water content for wood chips is 20 % (M20)
and therefore corresponds to the property class A1.
Water content Moisture Calorific value Relative wood
consumption
10.0 % 11.1 % 4.6 kWh/kg 87 %
20.0 % 25.0 % 4.0 kWh/kg 100 %
26.0 % 35.0 % 3.7 kWh/kg 110 %
30.0 % 42.9 % 3.4 kWh/kg 120 %
Table 3/2 - Calorific value depending on water content
P class
Main content
(mass fraction min.
60%)
Fine content
(% by weight)
≤ 3.15 mm
Coarse content
(% by weight)
Max. length, max. cross section
P45S 3.15 mm < P ≤ 45 mm ≤ 10 % ≤ 10 % > 63 mm, all ≤ 200 mm, cross
section of the outsized particles ≤ 6 cm2
Table 3/3 - Particle size