eta SH Touch User manual

2012-11-14
EN_Englisch
Operation
Log Boiler
20-60 kW

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Contents
Conditions for warranty, guarantee, liability ........4
Emission measurement ...................................6
Chimney renovation .......................................7
Boiler functionality ........................................8
Start-up..................................................... 10
Checking water pressure, suitable fuel................ 10
Correct quantity of wood................................ 11
Water pressure, heating lines, cleaning lever........ 12
Charging status of buffer storage tank ................ 13
Adding wood .............................................. 14
Ignition, closing doors ................................... 15
Closing ignition and insulation doors ................. 16
Adding fuel................................................. 17
Safety........................................................ 18
Safety devices to prevent overheating ................18
Maintenance............................................... 20
Overview of activities .................................... 20
Each time the boiler is filled ............................ 21
Every 1 - 2 weeks ........................................ 22
Annually .................................................... 24
Every 3 years............................................... 28
Approval, antifreeze, pressure equalisation, venting
32
Softened water, safety valve .......................... 33
Return riser and safety devices ....................... 34
Minimum heat consumption, buffer storage tank 35
Split wood will dry out in just one summer ......... 36
Heating value of wood .................................. 37
User interface.............................................. 38
Adjusting the date and time ............................ 38
Changing the language .................................. 39
Changing function block names........................40
Alarm, error, warning, message........................ 41
Opening the text menu.................................. 42
Buffer [Buffer]............................................. 46
Overview, buttons, functions...........................46
Buffer with solar .......................................... 47
Combination tank with solar ...........................48
"Buffer bottom max." for solar heating systems.... 49
Heating circuit [HC1] ..................................... 50
Meanings of symbols
Important NOTICES for operation.
CAUTION: Failure to observe these notices can
result in property damage.
STOP: Failure to observe these notices can result in
personal injury.
Overview, buttons and functions...................... 50
Operating states........................................... 52
Setting heating time slots ............................... 54
The heating curve......................................... 56
"Day Heating threshold" and "Night Heating
threshold".................................................. 57
Adjusting the heating curve ............................ 58
Setting the "enable temperature" .....................60
Adjusting the "Set-back" ................................ 61
Service and maintenance records..................... 62
Contents

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2012-11
Preface
SH Operation
Dear Customer,
We are delighted to count you among our
customers.
To ensure satisfactory operation of your new boiler,
you need to know how to operate, clean and
maintain it. This manual contains information and
advice on much more than just the boiler itself.
Warranty and guarantee
You should also read the "Conditions for warranty,
guarantee, liability" (page 4) carefully. As a
rule, these conditions will be satisfied by a profes-
sional heating technician. Nevertheless, inform the
technician of our warranty conditions. All of the
requirements we impose are intended to prevent
damage that neither you nor we wish to occur.
Information worth knowing in this regard can also
be found starting on page 32.
Optimum use of the control systems installed in
our boilers
There are two different access levels for the control
system:
At the CUSTOMER level, you can adjust the control
system to your wishes and needs without any risk
of altering the system configuration set by the
heating system expert.
Only your technician or a customer service
employee should change settings at the SERVICE
level. Before making any adjustments to these
settings yourself, it is essential that you consult an
expert.
Read this manual
carefully before starting up the system. This is the
only way to ensure that you can operate your new
boiler efficiently and with minimum environ-
mental impact.
Take advantage of the knowledge and skills of an
expert.
Only allow an expert to assemble, install and
commission the equipment and make the basic
boiler settings. Insist on receiving an explanation
and training on how your new boiler functions and
how to operate and maintain it.
Extended warranty for commissioning performed
by an authorised partner company
If your newly installed boiler is commissioned
by an authorised partner company or one of our
customer service employees, we offer an extended
warranty. Refer to our warranty conditions in
effect at the time of purchase.
Service agreement
You can ensure the best care for your heating
system by taking out a service agreement with one
of our certified heating system contractors or our
own customer service.
Preface

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Conditions for warranty, guarantee, liability
Conditions for warranty, guarantee, liability
We can only guarantee and accept liability for the
function of our boiler if it is properly installed and
operated.
Requirement for warranty, guarantee and liability
is that this boiler be used in accordance with its
intended purpose, only for heating and hot
water supply with no more than 2,000 full-
load hours annually, and, in particular, that the
following general conditions be observed during
installation and operation:
For set-up, a dry room is required. In particular,
only condensation dryers may be used as clothes
dryers in the same room.
Local building and fire protection regulations must
be observed.
The log wood boiler is suitable for use with
air-dried split logs with no more than 20%
water content and wood briquettes. Use with
unsuitable fuels, especially refuse, coal and coke,
and also wet wood, is not permitted.
The combustion air must be free of aggressive
substances such as chlorine and fluorine
from solvents, cleaning agents, adhesives and
propellants, or ammonia from cleaning agents,
to prevent corrosion of the boiler and chimney.
Water is the intended heat-transfer medium. For
special anti-frost requirements, up to 30% glycol
may be added. Softened water is required for
the initial fill-up of the heating system and for
refilling after repairs. For the initial fill-up, the
value of 20,000 lt°dH for the system volume in
litres multiplied by the hardness (in degrees of
German hardness) may not be exceeded. The
pH value should be set between 8 and 9.
Addition of hard water should be minimised to
limit limescale build-up in the boiler. Set enough
shut-off valves to avoid bleeding large amounts of
water during repairs. Any leaks in the system must
be repaired at once.
Ensure a minimum return temperature of 60°C
to the boiler.
A safety valve (3 bar) as protection against excess
pressure and a thermal relief valve (95°C) to
protect against overheating must be installed by
the contractor.
To protect against air suction if the system cools
off, an expert must provide a sufficiently large
expansion tank or a pressure maintenance
system. Sufficient air venting must also be
ensured. Open expansion tanks or underfloor
heating with permeable piping also have a
high air intake, resulting in above-average boiler
corrosion. Corrosion damage to the boiler due to
improper air venting or high air intake is excluded
from warranty, guarantee and liability.
Operation at lower power than the lowest power
specified on the type plate is not permitted.
Only components provided by us may be used
for expansion of the control system, except for
commonly used units such as thermostats.
Cleaning and maintenance are required as
specified in the user manual.
Repairs are only permitted with spare parts
provided by us. The only exceptions are common
standardised parts such as electrical fuses or
fastening materials, as long as they possess
the required features and do not restrict the
functionality of the system.

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Conditions for warranty, guarantee, liability
SH Operation
Subject to technical alterations
We reserve the right to make technical
modifications without notice. Printing and
typesetting errors or changes of any kind made
in the interim are not cause for claims. Individual
configurations depicted or described here are only
optionally available. In the event of contradictions
between individual documents regarding delivery
scope, the information in our current price list
applies.
The installing contractor is liable for proper
installation according to the boiler's installation
instructions and the relevant rules and safety
regulations. If you as customer have installed
the heating system partly or entirely without
relevant training and in particular without
up-to-date practical experience, without having
the installation checked by a trained and
responsible expert, we exclude defects in our
delivery and consequential damages resulting
from this cause from our warranty, guarantee and
liability.
For repair of defects carried out by the
customer or by third parties, ETA only bears the
costs or remains obligated by warranty if this work
was approved in advance by the customer service
of ETA Heiztechnik GmbH.

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Emission measurement
Emission measurement
Why measure emissions?
It is a requirement for the carbon monoxide (CO)
emissions of every boiler to be measured perio-
dically. In Germany, this periodical measurement
must also include a dust measurement.
There are several aspects of this that could go
wrong, resulting in incorrect measurements even
though the boiler fully and consistently complies
with these limits when operating in accordance
with the relevant standards.
Boiler and flue tube must be cleaned thoroughly
3 days before measurement
The chimney sweep will contact the owner of
the boiler when the measurement is due to take
place. The boiler and the flue tube must be cleaned
thoroughly 3 days before the measurement takes
place. The remaining charcoal stays in the fuel
chamber.
Heat up the boiler after cleaning
After cleaning, the boiler must be heated up again.
This allows dust that was stirred up during cleaning
to settle.
Under no circumstances clean the boiler and flue
tube on the day of the measurement!
Cleaning on the day of measurement should be
avoided as the chimney sweep's measuring probe
would measure the unsettled dust, resulting in a
falsely high dust reading.
The buffer must be empty at the start of the
measurement
The boiler and the buffer should be shut down
before the measurement. This is best done the
night before to prevent the boiler from switching
to partial load during the emission measurement.
Use half-metre logs for the emission
measurement
For the emission measurement, split half-metre
logs are to be used, stacked as tightly as possible
in the boiler (no round logs). The fuel chamber
should be filled as full as possible and the burn-
through openings on the grate must remain free.
Heat up boiler 1-2 hours before measurement
Heat up the boiler 1-2 hours before the chimney
sweep's arrival.
Ensure sufficient heat consumption
Open all the radiator valves and turn the radiator
thermostats to maximum.
Close doors at 100°C exhaust gas temperature
At 100°C exhaust gas temperature, close the
ignition door and the insulation door. Do not
open any doors before and during the emission
measurement. Also, do not stoke the fire.
Switch boiler to emission measuring mode
In the boiler overview screen, tap . This
switches the boiler into emission measurement
mode and operates it for 30 minutes at full load.
The control system ensures that sufficient heat is
channelled to the buffer, the heating circuits and
the hot water tank. The button shines green and
a countdown for the emission measurement
mode is displayed.
Wait 10 minutes, then perform emission
measurement
Once emission measuring mode has been activated
( ), wait for 10 minutes until the boiler has
reached the required operating temperature and
stable combustion is ensured. Then carry out the
emission measurement.
After the measurement
After the measurement, emission measurement
mode can be deactivated by pressing again. If
this button is not pressed, the boiler will auto-
matically switch back to normal mode after 30
minutes.

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Chimney renovation
SH Operation
Chimney renovation
Chimney renovation
With its controlled induced-draught fan and
adjustable minimum exhaust gas temperature,
your new boiler will largely adjust to existing flues
without the need for any special measures. Never-
theless, you should have the suitability of your flue
checked by a chimney sweep or chimney builder.
If the draught exceeds 30 Pa in very tall flues, a
draught-regulating damper is required.
Modern heating boilers are more efficient than
older ones and thus produce smaller amounts of
exhaust gas at considerably lower exhaust gas
temperatures.
Flues with "too large a cross-section" in particular
are no longer heated adequately. The moisture
contained in the exhaust gases condenses in the
flue and leads to very slow but inexorable destruc-
tion of old masonry chimneys.
Furthermore, if the diameter of the flue is too large,
the exit velocity and temperature are too low. The
exhaust gas does not have enough energy to rise
and, in extreme cases, the smoke can flow down
the roof.
If your flue does not have a water-resistant liner or
its diameter is too large, it will need to be reno-
vated with the addition of a moisture-insensitive
inner lining. If the existing flue cross-section is
adequate, a ceramic liner that is also resistant to
chimney fires is preferable to a stainless steel liner
when burning wood.
In the case of short flues that are not resistant to
moisture, it may suffice to raise the lower limit
for the exhaust gas temperature to 180°C in the
boiler's control system. In addition an auxiliary
air damper will help to keep the flue dry. If these
measures are deemed satisfactory, the flue should
be inspected to check whether it actually remains
dry. This is best discussed with the chimney sweep.
Also keep in mind that chimneys have a limited
service life. Timely renovation before the chimney
wall has been destroyed can be performed quickly
and easily by inserting a tube. But if the flue gas
condensates have penetrated the mortar joints,
then the entire flue must be dismantled and
rebuilt.

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Boiler functionality
Wood gasification
Before wood can burn, it must first be converted
into gas by application of heat. From 100°C, the
moisture contained in the wood is driven off. From
200°C, the process of decomposition into 20%
charcoal and 80% wood gas, a mixture of carbon
dioxide, carbon monoxide, hydrogen, methane,
methanol, various phenols, acetone and acetic
acid begins. Gas is released from a temperature of
400°C. However, a temperature of at least 900°C
is required to fully break down phenols (wood tar)
into combustible carbon, carbon monoxide and
hydrogen; 1100°C is better. In addition to a high
temperature, breaking down complex compounds
into wood gas also requires time; this explains why
the gas flame of a wood fire lasts so long.
Large wood supply in the fuel chamber
At the base of the stack of wood in the fuel
chamber, a small gasification fire is maintained
through a controlled flow of air (primary air) (1).
The boiler's control system regulates the output
of the gasification fire via the flow of primary air
(2). The wood gas is drawn downwards into a hot
combustion chamber. This prevents the stack of
wood in the fuel chamber from undergoing uncon-
trolled gasification and starting to burn and makes
it possible to have a boiler with a large supply of
wood that burns slowly for a long time.
Mixing nozzle and complete turbulence
A mixing nozzle (3) is located between the fuel
chamber and the combustion chamber. Here
preheated combustion air (secondary air) is mixed
with the wood gas. The flame exiting the mixing
nozzle hits the hot bottom of the combustion
chamber with high velocity and experiences
further turbulence (4), ensuring that every bit
of combustible gas finds sufficient oxygen for
complete burnout.
Complete burnout in the glow zone
To achieve uncooled combustion at high tempe-
ratures, the patented glow-zone combustion
chamber is made from refractory brick and is also
thermally insulated (5). In this glow zone, the
flame has enough time at temperatures between
900°C and 1100°C to break down and burn the
very last of the resistant carbon rings (phenols)
from the lignin in the wood. This enables the log
boiler to go below the limit of 100 mg of carbon
monoxide in the exhaust gas per MJ of output.
Boiler functionality

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Boiler functionality
SH Operation
Induced-draught adjusts to the flue
Thanks to the induced draught concept, the entire
interior of the boiler is under a negative pressure.
This means that no smoke or low-temperature
carbonisation gases can escape from the boiler
regardless of the phase of operation. The induced-
draught fan accommodates every flue, even those
with small cross-sections. Speed control and conti-
nuously adjustable dampers for combustion air
make draught limiters in the flue virtually unne-
cessary. Setting a minimum exhaust gas tempe-
rature prevents condensate formation in masonry
flues and allows the low-temperature capability of
modern flues to be fully utilised.
Turbulent heat exchanger with simple cleaning
The hot gas only enters the cold section of the
boiler following complete combustion. Once in the
cold section, it transfers its heat to the boiler water,
first while smoothly flowing through a long ash
collection duct (7) and then turbulently through
heat exchanger tubes equipped with turbulators.
The more turbulent the flow, the more the gas
comes into contact with the tube walls, thus
ensuring maximum transfer of heat to the boiler
water. This ensures low exhaust gas temperatures
and high efficiency. Pulling the cleaning lever
about 10 times prior to opening the boiler to refill
with fuel moves the turbulators up and down in
the heat exchanger tubes. The resulting fly ash
drops into the ash collecting duct, leaving the heat
exchanger clean.
Optimum fuel efficiency with lambda control
Gasification of the wood (output) can be controlled
via the flow of primary air. Through use of the
lambda-controlled secondary air (6), combustion
is kept clean and highly efficient. A lack of air
means there is not enough oxygen for complete
combustion. On the other hand, too much air
also results in incomplete combustion as it cools
the fire. Below 700°C, not all of the wood gas is
burned. Too much air also pulls unused heat out
of the boiler. The lambda probe ensures optimum
combustion and maximum fuel utilisation not only
with selected wood on the test stand, but also in
everyday operation.

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Checking water pressure, suitable fuel Start-up
Suitable fuel
The firewood must be air-dry, i.e. it must have
dried for at least one year and have a water
content under 20%. We recommend using half-
metre split logs with an average diameter of 10
cm.
7 - 9 cm
13 - 16 cm
8 - 10 cm
12 - 15 cm
Boards may only be added between the logs and
in no case should they be included in the first layer
as they would block the burn-through opening in
the grate.
Small pieces of firewood may only be used for
heating if added as a minor component to the
primary fuel. The smaller the pieces of firewood,
the less of them should be added.
Wood briquettes measuring 6 cm to 10 cm in
diameter in compliance with ÖNORM M 7135;
Germany: 1.BimSchV 15 July 1988 Fuel Class 4.
Only one oversized log per boiler filling
Only 1 oversized split log or 1 stump can be placed
in the top layer, but no more. Complete burning
may require 2 combustion phases.
Unsuitable fuel
Wet fuel with a moisture content in excess of 20%
may not be burned as it results in condensation
which can lead to corrosion of the boiler's fuel
chamber walls. The following may not be burned:
rubbish, paper and cardboard (only for start-up),
wood dust from sanding, sawdust, wood chips
smaller than thumb-sized, coal and coke, and fuels
generally prohibited by local air quality regu-
lations, such as railway sleepers, plastic-coated
plywood, impregnated wood etc.
Check water pressure
With a log boiler, it is no trouble to glance at the
pressure gauge daily or at least regularly. In houses
with up to three storeys, the water pressure in a
cold system should be between 1 and 2 bar, for a
warm system between 1.5 and 2.5 bar.
The most common defects in a heating system, i.e.
leaks and boiling over, result in a low water alert.
In the event of insufficient volume compensation,
water is released via the safety release valve. Either
the expansion tank is too small, the diaphragm
in the expansion tank is torn or a tap or valve
between the heating system and the expansion
tank was shut unintentionally. In this case, open
the valve or tap, remove the lever or hand wheel
and attach it to the valve with a wire.
Water will generally need to be added after the
radiators have been bled.
Minimum pressure
To establish the minimum pressure for a cold
heating system (especially when the buffer is also
cold from top to bottom), determine the height
of the space requiring heating above the heating
system's pressure gauge and add three metres. The
result is the minimum pressure in metres. Dividing
the metre value by ten gives you the minimum
pressure in bar, as shown on most pressure gauges.
Return temperature at least 60°C
The boiler return temperature should be at least
60°C to prevent corrosive condensation of flue
gases in the heat exchanger. The control system
monitors the return temperature. If the boiler
return temperature is too low, a warning appears
on the display.
Start-up
Checking water pressure, suitable fuel

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Start-up Correct quantity of wood
SH Operation
Correct quantity of wood
When not much heating is needed only place a
small amount of wood in the boiler
Absorbing all the heat from a boiler fully loaded
with wood would require buffer storage tanks
larger than needed for winter operation and also
larger than those normally installed. When less
heat is required, i.e. for hot water in the summer,
or during the evening shortly before the night
set-back, only load the boiler with the amount of
wood actually needed.
The table below displays the amount of wood
needed for summer operation for different boiler
sizes (= fuel chamber capacity), wood type, buffer
volume and buffer charging status. Bear in mind
that an "buffer top" temperature sensor that is
installed too low reduces the usable volume.
If the living space already needs some heating,
start with the amount of wood in indicated in
the table below. To establish the correct amount,
approach the fully charged buffer state slowly,
adding one or two more logs every heating
cycle. If too much wood is loaded, an emergency
shutdown of the boiler will occur. If the boiler
overheats, the flow of air is stopped. The fire
will go out, but the hot wood will continue to
smoulder for a while and the unburned wood gas
resulting from the lack of air will create tar deposits
in the boiler and flue. This happening once or
twice in an emergency is not a problem. However,
if this situation occurs every day, the boiler's heat
exchanger will become clogged with tar.
Note the energy density of the fuel
The energy content of 50 litres of wood briquettes
corresponds to 100 litres of beech wood or 150
litres of spruce.
Current buffer charging status is shown in
overview
The current buffer charging status in percent is
shown in the boiler [Boiler] and buffer [Buffer]
overviews. The buffer charging status is the
average of the three buffer temperatures (top,
middle, bottom) between 30°C (=0%) and 80°C
(=100%).
SH20, SH30 Buffer charging status SH40, SH50, SH60
Maximum fuel load Buffer size Maximum fuel load
Briquettes Beech Spruce 3,300 l 2,200 l 1,650 l 1,100 l Spruce Beech Briquettes
90% 85% 80% 70%
85% 78% 70% 55%
1/4 80% 70% 60% 40%
1/4 75% 63% 50% 25% 1/4
70% 55% 40% 10%
1/2 65% 48% 30% 0%
60% 40% 20% 1/4 1/8
55% 33% 10%
1/4 1/2 3/4 50% 25% 0% 1/2
45% 18%
40% 10%
Full 35% 0%
30%
3/4 25% 3/4 1/2 1/4
20%
15%
10%
5%
1/2 Full 0% Full
Correct quantity of wood

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Water pressure, heating lines, cleaning lever Start-up
Boiler start-up
Check water pressure
Before starting up, check the heating system's
water pressure (see also page 10). In houses
with up to three storeys, the water pressure in a
cold heating system should be between 1 and 2
bar, for a warm system between 1.5 and 2.5 bar.
Open heating lines
If the system is new or has been out of operation
for some time, verify whether the return riser
mixing valve is in "AUTO" position and all
shut-off valves in the heating lines are open.
Keep ball valves completely open to avoid ruining
the seals. Open valves by turning anti-clockwise,
and then turn back 1/4 turn from the fully open
position to relieve pressure on the valve stem.
Operate cleaning lever
With the insulation door still closed, clean the heat
exchanger by operating (10x) the cleaning lever
on the side.
10x
Afterwards, leave the lever pointing towards the
rear of the boiler. Then the turbulators remain in
position in the water-cooled heat exchanger.
Open insulation door, draught fan starts
automatically
When the insulating door is opened, the draught
fan starts automatically and the on/off button
in the boiler overview shines green. The operating
mode changes to "Insulation door open".
Water pressure, heating lines, cleaning lever

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Start-up Buffer charging status
SH Operation
If the draught fan does not start, it has been
deactivated by the safety temperature limiter due
to boiler overheating and a corresponding warning
appears on the display. The safety temperature
limiter can be manually released as soon as the
boiler temperature has fallen below 70°C.
Open fuel chamber door
The draught fan must be running before the
fuel chamber door is opened so that any
combustion gas can be extracted from the fuel
chamber. If the boiler has not safely cooled, no
boiler doors may be opened without an operating
draught fan. A sudden inflow of air in the presence
of smouldering wood may result in an explosion.
Combustion chamber
door
Fuel chamber door
The fuel chamber door is always closed during
both start-up and heating operation. It is
opened only when ash is removed from the boiler.
Check fuel chamber
Use the poker to distribute ashes and charcoal
evenly throughout the fuel chamber. In the panels,
the two upper openings for primary air must
be free. Also, the 3 burn-through openings in
the grate must stay open so that the fire reaches
the combustion chamber during ignition.
Primary air openings
Burn-through openings
Check buffer charging status
Before starting the boiler, check the current buffer
charging status to avoid adding too much
wood. The table on page 11 shows how much
wood should be added. The buffer charging status
is shown in percent values in the boiler overview.
Pay particular attention to the different energy
densities of the fuels.
Buffer charging status

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Adding wood Start-up
Place logs close together in fuel chamber
Add the required amount of closely spaced logs
to the fuel chamber. Stack the logs instead of
throwing them in at random. Always place the first
layer of logs lengthwise.
Adjust log over burn-through opening
Lift the bottom log above the burn-through
opening with the poker and place pieces of
charcoal (from the fuel chamber) or small pieces
of wood under it so that the burn-through
openings in the grate remain clear. To make
ignition easier, next to the log on the left and
right there should be a small gap separating it
from the neighbouring logs.
Place only 1 oversized log on top
Only 1 oversized split log or 1 stump can be placed
in the top layer, but no more. Two combustion
phases may be needed for complete burning.
Brushwood, coarse wood chips or carpentry
waste should be added only as a secondary fuel
among the split logs
First place half of the required amount of logs in
the fuel chamber (at least 3 layers). Then alterna-
tely add the secondary fuel (brushwood, coarse
wood chips or carpentry waste) and additional
logs.
The smaller the pieces of secondary fuel are,
the more logs must be added between them.
Adding wood

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Start-up Ignition, closing doors
SH Operation
Under no circumstances should brushwood,
coarse wood chips or carpentry waste be used
for the bottom layer. Such fine material burns
too quickly, resulting in incomplete combustion in
the combustion chamber, which is still cold during
start-up. As a result, soot builds up in the heat
exchanger.
Close fuel chamber door, open ignition door
Close the fuel chamber door and then open the
ignition door.
If the boiler is not to be started up yet, close both
doors and in the boiler overview, press the on/off
button so that it shines red.
Ignite the fire with cardboard and newspaper
Place crumpled paper or a few pieces of cardboard
in front of the first layer of wood and ignite it.
The draught fan sucks the flame over the tightly
stacked logs, causing them to ignite more quickly.
For heavy, smooth hardwood, larger pieces of
kindling may be needed for ignition.
Never use petrol, turpentine or similar
materials as an "ignition aid": risk of explosion!
The ignition door should be kept open after
ignition to monitor the progress of the fire. It
should only be closed once the boiler's exhaust gas
temperature has reached 100°C. How long it takes
the fire to start depends on the type of wood used;
rough spruce may need only 2 minutes, smooth
beech may require 5 minutes until the required
exhaust gas temperature of 100°C is reached.
Ignition, closing doors

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Closing ignition and insulation doors Start-up
At 100°C exhaust gas temperature, close ignition
door and insulating door.
Once a few logs are burning well and the
exhaust gas temperature is over 100°C, close
the ignition door and the insulating door. The
exhaust gas temperature is displayed in the boiler
overview. At over 100°C, an arrow appears to
indicate that the ignition door should be closed.
When the insulating door is closed, the boiler
automatically switches to ignite mode and,
once the residual oxygen content is below 15%,
to heating mode. The boiler is now in heating
mode and regulates the combustion of the wood
independently.
Avoid opening boiler doors unnecessarily
Avoid opening the insulating door and the fuel
chamber door unnecessarily in heating mode.
That disrupts the boiler control and increases fuel
consumption. Also keep the ignition door and the
combustion chamber door closed.
Never open the insulating door and the fuel
chamber door when the boiler is in "Calibrating
lambda probe" or overtemperature mode.
Completion of heating mode with ember burnout
Once the wood in the boiler has been burned
(residual oxygen content below 15% for more than
5 minutes) or the exhaust gas temperature falls
below 80°C, the boiler automatically starts burnout
("Ember burnout" mode). If the de-ash button
was not pressed, the boiler frees the secon-
dary air ducts of ash with fresh air. Charcoal and
embers remain in the boiler by design so that
newly added wood can be ignited more easily.
Complete ember burnout for cleaning
For cleaning after the last heating operation, in the
overview press the de-ash button (which
then shines green).
Ember retention is then deactivated and the boiler
performs a complete ember burnout (duration
~1 hour), burning most of the charcoal in the fuel
chamber to make subsequent cleaning of the boiler
easier.
Closing ignition and insulation doors

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Start-up Adding fuel
SH Operation
Adding fuel
Adding fuel
You should only add fuel when the buffer
charging status is below 30% and the fuel
chamber has burned to empty.
If wood has been added and there are still embers
in the boiler, it automatically tries to ignite the
wood again. If the wood is hard to ignite and
there are only a few remaining embers, it may help
to push the charcoal together in the middle before
refilling. If the remaining embers do not ignite the
wood, light it with paper and cardboard through
the ignition door.

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Safety devices to prevent overheating Safety
Safety
Safety devices to prevent overheating
Safety devices to prevent overheating
The following safety chain takes effect if the boiler
exceeds the operating temperature for any reason:
• over 87°C -> pump safety run
• over 90°C -> draught fan switched off
• over 95°C -> thermal emergency cooling valve
• over 105℃ -> safety temperature limiter
• over 3 bar water pressure -> safety valve
Pump safety run
If the boiler temperature exceeds 87°C (=factory
setting [Pump safety run]), the pump safety run
starts. All heating pumps and boiler pumps
that are connected to the boiler control are
switched on to dissipate heat from the boiler.
This action prevents the boiler temperature from
rising further and triggering further safety devices
such as the safety temperature limiter and thermal
emergency cooling valve. This emergency cooling is
indicated on the display by "heat dissipation".
The heat dissipation is limited with the
maximum flow temperature set in the
heating circuits and the hot water setpoint
temperature.
Boiler overheating
If 90°C boiler temperature (factory setting [Boiler
max.]) is reached, the control system switches
the draught fan off and a warning message
appears on the display. Reasons for a boiler tempe-
rature increase include:
• too much wood added (see page 11)
• heating circuits unexpectedly switched off
• heating pump failed
• heating line inadvertently shut off
Once the boiler temperature has fallen below 86°C,
heating resumes automatically.
During such emergency shutdowns the wood
continues to emit gas and the unburned wood
gas causes tar deposits in the boiler and
chimney.
Thermally actuated drain valve (to be supplied by
technician)
Independent of the other safety devices, the
thermal emergency cooling valve is non-electri-
cally triggered at boiler temperatures between
92°C and 97°C. The thermal emergency cooling
valve is opened by means of a sensor system
containing a liquid that expands when heated (no
electricity required). It causes the boiler's safety
heat exchanger to be flooded with drinking
water, dissipating the excess heat out of the boiler
into the sewer.
If the thermal emergency cooling valve activates
frequently, check whether it activates at a
temperature below 92°C and replace it if necessary.
Safety temperature limiter
For additional safety against boiler overheating, a
safety temperature limiter is built into the boiler.
When a boiler temperature of 105°C (tolerance
100°C to 106°C) is reached, the power supply to
the draught fan is switched off.
If the boiler temperature falls below 70°C, the
safety temperature limiter can be manually reset.
The reset button is recessed into the door frame
above the fuel chamber door. To reset, press it
deeply into the recess.
Safety temperature limiter
Safety valve against excess pressure (to be
supplied by technician)
The most common cause of safety valve activation
is either an undersized expansion tank or heating
lines that have been shut off. The safety valve also
serves as a backup safety device to prevent boiler
overheating in the event that all other devices in
the safety chain fail.

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Safety Safety devices to prevent overheating
SH Operation
The safety valve must be installed in the flow
line right where it leaves the boiler, as it cannot
dissipate any heat if installed in the return line.
In rare cases when neither the thermal emer-
gency cooling valve nor the safety temperature
limiter trips, the pressure and temperature will
increase until the safety valve opens. If this occurs,
it is crucial to check that the thermal emergency
cooling valve and the safety temperature limiter
are working properly. If cold water is drawn from
an on-premises well with its own pump, a power
failure may be the reason for failure of the thermal
emergency cooling valve. If this occurs frequently,
a larger air chamber in the building's water supply
or a separate air chamber for the thermal emer-
gency cooling valve is required.

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Overview of activities Maintenance
Regular cleaning and servicing
To ensure that the boiler operates optimally and
reliably, it must be cleaned and serviced at regular
intervals.
Maintenance and cleaning of the boiler must be
performed within the specified periods (see table).
Cleaning and maintenance overview
The table provides an overview of the required
cleaning and maintenance.
The "To be done by" column indicates which
activities you as customer can deal with and which
must be performed by an expert.
Activity
Frequency
To be done by
Every 1 - 2
weeks
Annual
maintenance
Every
3 years
Operate cleaning lever X X X Customer
Check water pressure X X X Customer
De-ash boiler XXXCustomer
Check walls of ash collection duct X X X Customer
Check safety valves and thermal emergency cooling valve X X X Customer
Clean casing and display XXXCustomer
Remove ash behind panels X X Customer
Clean primary and secondary air duct X X Customer
Check and clean flue tube X X Customer
Clean heat exchanger box X X Customer
Check turbulators for tar deposits X X Customer
Clean draught fan X X Customer
Check safety valves X X Customer
Check door seals X X Customer
Check safety devices X Expert
Clean the lambda probe XExpert
Inspect seal on heat exchanger cover X Expert
Perform emission measurement XExpert
Calibrate lambda probe X Expert
Perform heating test X Expert
Reset maintenance counter X Expert
Maintenance
Overview of activities