HDG K10 User manual

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HDG K10/15/21/26/33
Operating manual

Operating manual HDG K10 - 33 - Content
3
Content
1 Notes on this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1.2 Glossary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
2 Safety notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.1 Intended use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Basic system design principles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Basic principles for the content of the operating manual . . . . . . . . . . . . . . . . . . . .7
Proper and improper operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.2 Residual risks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
2.3 Warnings and safety symbols used. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
2.4 Safety instructions for the pellet storage room . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
2.5 Duty of information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3 Mode of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3.1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Cross section of HDG K10 - 33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3.2 Functional description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Combustion process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Boiler and weather-compensated heating control HDG Control . . . . . . . . . . . .14
Delivery system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Pellet suction system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Reservoir . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
3.3 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
3.4 Fuel quality requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Recommended fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
4 Planning and installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
4.1 Planning the heating system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Required room sizes and minimum clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Dimensions and connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Furnace room. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.2 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Chimney . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Electrical system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
4.3 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
4.4 Installing the heating system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Removing the transport pallet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Installing the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Fitting the filling and drain cock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Converting the flue pipe connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Operating manual HDG K10 - 33 - Content
4
Installing the reservoir . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Fitting the cladding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Installing the ash container. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Mounting the expansion modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Connecting the suction and return hoses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
4.5 Connecting the chimney. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
4.6 Electrical system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
4.7 Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
5 Commissioning the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.1 Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.2 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Setting the fuel quantity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Perform actuator test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Adapting parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
6 Using the heating system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
6.1 Control unit for HDG Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
6.2 Filling the pellet storage room . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
6.3 Filling the reservoir . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.4 Performing a chimney sweep measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.5 Switching off the heating system for repair work . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
7 Cleaning and servicing the heating system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
7.1 Cleaning and servicing schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
7.2 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Generally applicable safety instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Cleaning tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Emptying the ash container . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Cleaning the combustion chamber and burner pot . . . . . . . . . . . . . . . . . . . . . . . 49
Cleaning the flue gas fan and cleaning shaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Cleaning the flue gas pipe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Check the fill level of the water tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Checking and cleaning the reservoir and flap of the delivery unit . . . . . . . . . . 54
Cleaning the pellet storage room . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
8 Notes on dismantling and disposal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
8.1 Dismantling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
8.2 Disposal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
9 Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
10 Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

1 Notes on this manual – Introduction
5
1 Notes on this manual
1.1 Introduction
EASY AND SAFE OPERATION This operating manual contains important instructions on the
•HDG K10
•HDG K15
•HDG K21
•HDG K26
•HDG K33
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 K10 - 33.
TECHNICAL CHANGES We continuously develop and improve our boilers. The information
in this edition was correct at the time of going to press.
All details in these instructions on standards, regulations and
worksheets should be checked before use and should be compared
with the regulations applying locally at the site where the system is
installed.
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 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
✓Result of the action described
✎Cross reference for more explanation
•List
–List

1 Notes on this manual – Glossary
6
1.2 Glossary
Term Explanation
Actuator This is a component which carries out a certain function in the
heating system e.g. the worm feed stoking unit.
Automatic cleaning At intervals, automatically cleans the surface of the heat
exchangers.
Delivery system Pellet transport system in the pellet storage room.
Display Display of the boiler control unit.
Extinguishing device Extinguishes the contents of the reservoir if the temperature of the
contents exceeds 90°C.
HDG Control Boiler and heating system controller.
HDG K10 - 33 Heating system for burning wood pellets.
Heating system Comprised of boiler and corresponding accessories.
Pellet suction system Pellet transport system which connects the reservoir with the
delivery system.
Reservoir A container which supplies pellets to be burnt in the boiler via the
conveying auger.
Sensor Records certain parameters (temperature, fill level) and forwards
them to the control for analysis.
Wood pellets Binder-free pellets made of pressed, untreated wood.
Table 1/1 - Glossary

2 Safety notes – Intended use
7
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 a detailed
explanation of 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 K10 - 33 heating
systems. 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 Bavaria
does not assume any liability for this.
PROPER AND IMPROPER OPERATION
PURPOSE OF THE HEATING
SYSTEM
The heating system HDG K10 - 33 was designed to burn wood pellets
in hot 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
8
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 can lead to burns.
Wait until the boiler has cooled down before touching non-
insulated components.
Danger!
Danger of asphyxiation due to lack of oxygen
If the boiler is in operation, carbon monoxide can be emitted
through the open doors and lids.
Do not leave the doors and lids open any longer than necessary.
Warning!
Danger of fire
Opening doors and lids to hot combustion residues during
operation can pose the danger of fires.
Keep the openings closed during operation, and when performing
cleaning work, allow the combustion residues to cool down before
you place them in a fireproof container.
Warning!
Danger from suspended loads
The boiler weighs over 300 kg. If the boiler is dropped during
transport, persons can be seriously injured and the boiler can be
damaged.
Make sure that you use appropriate lifting gear when placing the
boiler.

2 Safety notes – Warnings and safety symbols used
9
2.3 Warnings and safety symbols used
The following warnings and safety symbols are used in this
Operating manual:
Danger!
Danger of explosion due to carbon monoxide
Filling the burner pot with pellets manually may result in too much
fuel in the burner pot. Consequently the pellets will not be
optimally ignited and too much low temperature carbonisation gas
may result which can lead to an explosion.
Do not fill the burner pot manually.
Danger!
Dangerous electrical current or voltage
The circuit boards and other electrical components carry current.
Have work on electrical components performed only by a qualified
electrician and turn the main switch off.
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.
Warning!
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.

2 Safety notes – Warnings and safety symbols used
10
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.
Caution!
Danger of explosion
When working in areas marked with this symbol, there is a danger
of explosion due to high concentrations of carbon monoxide.
Warning!
Suspended loads
When working in areas marked with this symbol, there is a danger
of falling objects.
Caution!
Automatic start-up
Working in areas marked with this symbol can lead to injuries due
to automatic start-up.
Important!
Frost danger
Only install the heating system in a frost-proof room.
Instructions regarding disposal
Additional information for the operator

2 Safety notes – Safety instructions for the pellet storage room
11
2.4 Safety instructions for the pellet storage
room
After the storage room is filled, odourless carbon monoxide may
form and a lack of oxygen may arise. Therefore, in the first 6 weeks
after filling the storage room, it is prohibited to enter the storage
room, and only trained personnel may do so.
For pellet storage rooms, a special sticker (issued by the German
Association of wood and pellet fuels - DEPV) must be attached to the
access hatch to the fuel storage room.
It lists the following instructions.
•Access prohibited to unauthorised persons, keep children away!
•Smoking, flames and other sources of ignition prohibited.
•Turn the pellet boiler off for at least 1 hour before filling.
•Ensure adequate ventilation before entering.
•Beware of a risk of injury from moving components.
•Make sure filling is carried out properly.
2.5 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.
In addition, observe the VDI guideline 3464 “Storage of wood
pellets at the consumer”.

3 Mode of operation – Overview
12
3 Mode of operation
3.1 Overview
CROSS SECTION OF HDG K10 - 33
1 Vacuum fan
2 Flap of the delivery unit
3 Reservoir
4 Reservoir level indicator
5 Conveyor auger
6 Drive motor of stoker auger
7 Sensor for auger pipe safety thermostat
Figure 3/1 - Cross section of HDG K10 - 33
8
1
6
4
711
13
14
16
18
10
12
3
5
2
17
15
9

3 Mode of operation – Functional description
13
8Ashcontainer
9 Combustion grate drive motor
10 Ignition element
11 Ash compartment
12 Ash removal / cleaning system drive motor
13 Primary air pin
14 Burner pot
15 Drop chute
16 Heat exchanger surfaces incl. turbulators
17 Combustion chamber temperature sensor
18 Control unit HDG Control Touch
3.2 Functional description
COMBUSTION PROCESS
In boiler HDG K10 - 33, the pellets are automatically transported from
the fuel storage room to the reservoir using the delivery system with
the assistance of the pellet suction system. The feeding system
conveys the pellets to the burner pot of the boiler.
The automatic pellet suction system does not need to be fitted. In
this case the reservoir will be filled manually.
The combustion process starts with a preliminary flushing. The flue
gas fan and the combustion chamber of the boiler is flushed with
fresh air. The next step is the ignition phase. The supplied pellets are
automatically ignited with a heating element. In the subsequent
flame stabilisation phase, even combustion is established.
The system then changes to modulation mode. In this mode,
combustion is carried out according to the required output.
The boiler HDG K10 - 33 is equipped as standard with an automatic
heat exchanger cleaning system. This ensures a consistently high
heat transfer and consequently a high level of efficiency.
If the extracted power falls below the minimum nominal thermal
power or there is no heating request, the boiler goes into burn-out
mode. The flue gas fan continues running until the burner pot has
cooled down.
To prevent the grating from slagging up and to ensure ash removal
occurs, the grate plate is moved at intervals. The automatic ash
removal system transports the accumulated fly and combustion ash
to the external ash container.
The air necessary for combustion is supplied as required via a speed-
controlled flue gas fan.
Sensors are used to:
– Continuously monitor the firing

3 Mode of operation – Functional description
14
– Adapt the boiler output to the heat requirements
– Minimise emissions
– To optimise boiler efficiency
BOILER AND WEATHER-COMPENSATED HEATING CONTROL HDG
CONTROL
BOILER CONTROL UNIT The boiler control unit of the pellet boiler HDG K10 - 33 is the
electronic hub. It consists of the ready-to-use control panel and
control unit on the top right side of the boiler. Using the control unit,
you can regulate the boiler and call up information on the current
process.
If the heating circuits issue a request for more heat, the pellet system
automatically switches to the flushing operating mode and the
combustion process begins.
Once the desired boiler temperature has been reached, i.e. the need
for heat has been met, the heating system changes to Burn out
mode and subsequently to the operating status Standby.
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
•Control of the second boiler
•Transfer of heat into the district heating grid
•Solar system for hot water and support of the heating system
✎For a description of the HDG Control boiler and weather-compen-
sated heating control, refer to the “HDG Control” operating
manual.
DELIVERY SYSTEM
The delivery system is in the pellet storage room. Various delivery
system options are available.
•Suction probes: The pellets are drawn up through 8 suction
probes in the fuel storage room.
•Auger: Via an auger, the pellets on the sloping floor are
transported to the transfer station.
•Pellet mole: The pellet mole moves freely in the fuel storage room.
•Pellet fabric silo: External pellet storage made from polyester.
The delivery system is controlled by the control system HDG Control.

3 Mode of operation – Functional description
15
PELLET SUCTION SYSTEM
The pellet suction system links the delivery system with the reservoir
of the HDG K10 - 33 boiler. This process is monitored by sensors and,
using the boiler control system, can be limited to various times of
day.
RESERVOIR
Various versions are available:
Reservoir
Automatic
Reservoir
Manual, small
(Day container)
Reservoir
Manual, large
(Week container)
Filling Automatic (pellet
suction system)
By hand By hand
Volume 107 kg 107 kg 200 kg
Table 3/1 - Reservoir

3 Mode of operation – Technical data
16
3.3 Technical data
*Maximum operating temperatures of up to 110 °C can also briefly occur.
Type of boiler HDG K10 HDG K15 HDG K21 HDG K26 HDG K33
Performance data (measured according to DIN EN 303-5)
Nominal thermal power 9.9 kW 15 kW 21 kW 25.9 kW 32.5 kW
Minimum thermal power 3.0 kW 4.3 kW 6.3 kW 7.6 kW 9.8 kW
Boiler efficiency at nominal thermal power 94.4 % 93.8 % 93.9 % 93.9 % 94.8 %
Electrical power consumption at nominal
thermal power 28 W 33 W 41 W 48 W 77 W
Electrical connection:
•Voltage
•Frequency
•Back-up fuse
230 V
50 Hz
13 A (slow-blow)
General boiler data
Boiler class 5
Maximum permissible operating pressure 3.0 bar
Maximum supply temperature 85 °C*
Minimum return temperature 20 °C
Water capacity 39 l 47 l
Weight 261 kg 283 kg
Planning data for flue calculation (DIN EN 13384-1)
Flue gas temp. (Tw) at nominal thermal power
Flue gas temp. (Tw) at lowest thermal power
98 °C
78 °C
119 °C
82 °C
127 °C
87 °C
134 °C
90 °C
138 °C
92 °C
Flue gas mass flow, nominal thermal power
Flue gas mass flow, minimum thermal power
0.0058kg/s
0.0025kg/s
0.0085kg/s
0.0034kg/s
0.0118kg/s
0.0044kg/s
0.0146kg/s
0.0049kg/s
0.0180kg/s
0.0060kg/s
CO2content at nominal thermal power
CO2content at minimum thermal power
13.4 %
9.7 %
14.2 %
10.1 %
14.2 %
11.3 %
14.2 %
12.1 %
14.6 %
12.3 %
Flue draught requirement (Pw) 5 Pa
Diameter of flue pipe connection 130 mm
Height at middle of flue gas pipe connection 1050 mm (top) / 750 mm (rear)
Water-side connections
Supply and return connections DN 25, outside thread
Recommended pipe dimensions (minimum) DN 25
Water-side resistance, 10 K
Water-side resistance, 20 K
360 Pa
100 Pa
760 Pa
210 Pa
1430 Pa
390 Pa
2150 Pa
580 Pa
3110 Pa
860 Pa
Other information
Sound pressure level 45.3 dB(A) 45.7 dB(A) 46.1 dB(A) 46.5 dB(A) 47.6 dB(A)
Min. Air inlet cross section 150 cm²
Table 3/2 - Technical data

3 Mode of operation – Fuel quality requirements
17
3.4 Fuel quality requirements
Only wood pellets are permissible as fuel for the HDG K10 - 33 boiler.
Wood pellets are pressed into a cylindrical shape. They consist of
untreated shavings and sawdust from the wood processing industry
as well as unprocessed forestry waste. They have a standardised
diameter and length. They are pressed at a very high pressure and
have a very low water content. The energy contained in 2 kg of
pellets corresponds approximately to the energy contained in a litre
of heating oil.
Essential criteria for the definition of the property classes are the
length and diameter, moisture content and ash content of the fuel.
LENGTH AND DIAMETER The diameter of the pellets used must be in accordance with D06, i.e.
6 mm +/- 1 mm. The length of the pellets must measure between
3.15 mm and 40 mm. A maximum of 1.0% by weight of the pellets
may be longer than 45 mm.
WATER CONTENT The water content must be less than 10% (M10) for property classes
A1, A2 and B.
ASH CONTENT The ash content of the property class A2 and B is higher than that of
A1 due to the higher proportion of bark, needles and leaves. The
maximum ash content for property class A1 is 0.7% by weight (A0.7),
for property class A2 the maximum ash content is 1.2 % by weight
(A1.2) and for property class B the maximum ash content is 2.0 % by
weight (A2.0). In accordance with the 1st Federal Emission Control
Ordinance, operation with pellets in Germany is limited to property
class A1.
Alternatively pellets with the “ENplus” or “DINplus” certificate are
also suitable as they meet the quality requirements of property class
A1.
RECOMMENDED FUEL
It is important that fuel is used according to HGD fuel specifications
In particular, all fuel requirements concerning size, water content
and ash content must be met..
With regard to the quality standards for pellets, DIN EN ISO 17225-2
“Biogenic solid fuel - fuel specifications and classes - classification of
pellets” applies.
In accordance with this standard, the properties of pellets that can
be used with the HDG K10 - 33 are specified below in more detail.
Pay particular attention to the fuel quality, both when ordering and
at delivery.
Important!
If there is a significant change of fuel, the system must be reset
accordingly and checked for emissions by authorised specialists.

4 Planning and installation – Planning the heating system
18
4 Planning and installation
4.1 Planning the heating system
REQUIRED ROOM SIZES AND MINIMUM CLEARANCES
* for HDG K21/26/33. For HDG K10/15 = 710 mm
** with 107 kg reservoir. With 200 kg reservoir = 1425 mm
Minimum room height: 1850 mm
Recommended room height: 2250 mm
Figure 4/1 - Room sizes and minimum clearances in mm
*
**
*
**
Flue pipe behind Flue pipe above

4 Planning and installation – Planning the heating system
19
DIMENSIONS AND CONNECTIONS
* with 107 kg reservoir. With 200 kg reservoir = 1470 mm
** with 107 kg reservoir. With 200 kg reservoir = 1425 mm
1 Boiler supply connection (DN 25, outside thread)
2 Boiler return connection (DN 25, outside thread)
FURNACE ROOM
APPLICABLE REGULATIONS Local building regulations always apply. In Germany, individual state
regulations on boilers and furnaces (FeuVO) also apply.
Make sure there is an adequate supply of fresh air to the boiler room
so that there is enough air available for the combustion process and
to protect the operator from the hazards of insufficient oxygen.
INSTALLATION A base is not necessary for installation of the heating system. Ensure
alignment on a horizontal plane.
To ensure unhindered operation and maintenance of the heating
system, it is imperative that the heating system is installed in
accordance with the specifications of HDG Bavaria and that the
minimum spacing requirements are observed.
Figure 4/2 - Dimensions (mm) and connections
*
**
1
2
Important!
Building regulations may differ from country to country and state to
state.
For this reason, consult a qualified specialist for the planning and
installation of your boiler room.
Observe the fire safety regulations.

4 Planning and installation – Connections
20
Also note that the thresholds in DIN 4109 “Soundproofing in building
construction” may not be exceeded.
More detailed information can be found in the relevant local and
national regulations.
We recommend that objects which are not needed for the operation
or maintenance of the heating system not be stored in the boiler
room.
4.2 Connections
CHIMNEY
The benefits of the HDG K10 - 33 can only be enjoyed if all of the
prerequisites for good combustion are ensured. The heating system
and chimney form a single functional unit and must be adapted to
one another in order to guarantee fault-free and economical
operation.
Since the flue temperature may lie below 100°C when the system is
partially loaded, a chimney/flue is required which meets the
requirements of DIN EN 13384-1: 2003-03 “Thermal and fluid
dynamic calculation methods”. If it does not meet this standard,
contact your specialist heating company or chimney engineer.
Another essential criterion is to achieve the correct flue draught. This
depends on three major factors.
CHIMNEY CHARACTERISTICS The requirements for minimising the draught loss in the chimney are:
•Good thermal insulation to avoid the flue gases cooling down too
quickly.
•Smooth interior surface to reduce the flow resistance.
•Chimney well-sealed to avoid outside air leaking in. Air
penetrating from the outside speeds up the cooling of the flue
gases.
Also observe the accident prevention regulations of the official
safety organisations.
According to EN 303-5, the entire flue system must be installed in
such a way that contamination, condensation and insufficient flue
draught are avoided. Note here that in the accessible operational
area of the boiler, flue gas temperatures of less than 160 K above
room temperature may arise.
✎The required flue gas values are listed in chapter “3 Mode of
operation”, section “3.3 Technical data”.
When planning the flue system, a flue calculation based on DIN EN
13384-1 must be performed by authorised specialists.