Froling S4 Turbo Owner's manual

Category
Thermostats
Type
Owner's manual
Operating instructions
Firewood boiler S4 Turbo (F)
Translation of original German version of operating instructions for operators.
Read and follow all instructions and safety instructions.
All errors and omissions excepted.
B1510723_en | Edition 07/09/2023
Table of Contents
ii B1510723_en | Operating instructions Firewood boiler S4 Turbo (F)
1 General ......................................................................................................................................................... 4
1.1 Operating principle ................................................................................................................................ 4
1.2 S4 Turbo Product Overview .................................................................................................................. 5
2 Safety............................................................................................................................................................ 6
2.1 Hazard levels of warnings ..................................................................................................................... 6
2.2 Pictograms used ................................................................................................................................... 7
2.3 General safety information .................................................................................................................... 8
2.4 Permitted uses ...................................................................................................................................... 9
2.4.1 The Clean Air Act 1993 and Smoke Control Areas.................................................................... 9
2.4.2 Permitted fuels ........................................................................................................................... 10
2.4.3 Fuels permitted under certain conditions ................................................................................... 11
2.4.4 Non-permitted fuels.................................................................................................................... 12
2.5 Qualification of operating staff............................................................................................................... 12
2.6 Protective equipment for operating staff ............................................................................................... 12
2.7 Safety devices....................................................................................................................................... 13
2.8 Residual risks........................................................................................................................................ 14
2.9 Emergency procedure........................................................................................................................... 15
2.9.1 Overheating of the system ......................................................................................................... 15
2.9.2 Smell of flue gas ........................................................................................................................ 16
2.9.3 Power failure / induced draught fan failure ................................................................................ 16
2.9.4 Fire in the system....................................................................................................................... 17
3 Notes for operating a heating system ....................................................................................................... 18
3.1 Installation and approval ....................................................................................................................... 18
3.2 Installation site ...................................................................................................................................... 18
3.3 Combustion air ...................................................................................................................................... 19
3.3.1 Combustion air supply at the installation room .......................................................................... 19
3.3.2 Simultaneous operation with other air-drawing systems............................................................ 20
3.4 Domestic hot water ............................................................................................................................... 21
3.5 Pressure maintenance systems ............................................................................................................ 22
3.6 Return lift............................................................................................................................................... 23
3.7 Combination with storage tank.............................................................................................................. 23
3.8 Chimney connection/chimney system................................................................................................... 23
4 Operating the System ................................................................................................................................. 24
4.1 Assembly and initial startup .................................................................................................................. 24
4.2 Switching on the power supply.............................................................................................................. 25
4.3 Before heating up the boiler .................................................................................................................. 25
4.3.1 Clean the heat exchanger pipes ................................................................................................ 25
4.3.2 Check the igniter tube (for automatic ignition) ........................................................................... 25
4.3.3 Reloading intervals when operating with storage tank............................................................... 26
4.3.4 Reload quantity calculation ........................................................................................................ 27
4.3.5 Determining the right amount of fuel.......................................................................................... 28
4.3.6 Reloading intervals when operating without storage tank or if the storage tank is too small..... 29
4.4 Filling the boiler with firewood ............................................................................................................... 30
4.5 Heat up firewood manually.................................................................................................................... 32
4.6 Heat up the firewood with automatic ignition......................................................................................... 32
4.7 Operate the boiler using the touch display............................................................................................ 34
4.7.1 Overview of the touch display .................................................................................................... 34
4.7.2 Select information displays ........................................................................................................ 40
4.7.3 Change boiler mode................................................................................................................... 42
4.7.4 Change date and time................................................................................................................ 42
Table of Contents
B1510723_en | Operating instructions Firewood boiler S4 Turbo (F) iii
4.7.5 Change desired DHW tank temperature.................................................................................... 43
4.7.6 One-time extra loading of an individual DHW tank .................................................................... 43
4.7.7 One-time extra loading of all existing DHW tanks...................................................................... 43
4.7.8 Set the heating curve of a heating circuit................................................................................... 44
4.7.9 Change room temperature (heating circuit without room temperature sensor) ......................... 45
4.7.10 Change room temperature (heating circuit with room temperature sensor) .............................. 46
4.7.11 Switch heating circuit mode ....................................................................................................... 46
4.7.12 Lock display/switch user level.................................................................................................... 47
4.7.13 Change the name of the components........................................................................................ 47
4.7.14 Configure the holiday program................................................................................................... 48
4.8 Reloading firewood ............................................................................................................................... 50
4.9 Switching off the power supply.............................................................................................................. 50
4.10 Checking the ash level in the boiler ...................................................................................................... 51
4.10.1 Emptying ash ............................................................................................................................. 51
4.10.2 Cleaning the grating................................................................................................................... 52
5 Servicing the system .................................................................................................................................. 53
5.1 General information on servicing .......................................................................................................... 53
5.2 Required tools ....................................................................................................................................... 54
5.3 Maintenance work by the operator........................................................................................................ 55
5.3.1 Inspection................................................................................................................................... 55
5.3.2 Periodic inspection and cleaning ............................................................................................... 56
5.4 Maintenance work by technicians ......................................................................................................... 66
5.4.1 Cleaning the Lambda probe....................................................................................................... 67
5.5 Emissions measurement by chimney sweep or regulatory body .......................................................... 69
5.5.1 General information on measurement ....................................................................................... 69
5.5.2 Create the measurement conditions and perform the measurement......................................... 70
5.6 Replacement parts ................................................................................................................................ 71
5.7 Disposal information.............................................................................................................................. 71
5.7.1 Disposal of the ash .................................................................................................................... 71
5.7.2 Disposal of system components ................................................................................................ 71
6 Troubleshooting .......................................................................................................................................... 72
6.1 General fault with power supply ............................................................................................................ 72
6.1.1 Behaviour of system after a power failure.................................................................................. 72
6.2 Extra cleaning of flue gas paths ............................................................................................................ 72
6.3 Excessive temperature.......................................................................................................................... 73
6.4 Faults with fault message...................................................................................................................... 73
6.4.1 Procedure for fault messages .................................................................................................... 74
1 | General
4 B1510723_en | Operating instructions Firewood boiler S4 Turbo (F)
1 General
Thank you for choosing a quality product from Froling. The product features a state-of-
the-art design and conforms to all currently applicable standards and testing
guidelines.
Please read and observe the documentation provided and always keep it close to the
system for reference. Observing the requirements and safety information in the
documentation makes a significant contribution to safe, appropriate, environmentally
friendly and economical operation of the system.
The constant further development of our products means that there may be minor
differences from the pictures and content. If you discover any errors, please let us
Subject to technical change.
Warranty and Guarantee Conditions
Our sale and delivery conditions will be applicable. These conditions have been made
available to customers, and customers have been made aware of them at the time of
order completion.
You can also find the guarantee conditions on the enclosed guarantee certificate.
1.1 Operating principle
The Froling S4 Turbo is a wood boiler for the non-condensing combustion of firewood.
The fuel loading chamber is filled with fuel via the fuel loading door located behind the
heat insulated door on the front of the boiler. The combustion grate, through which the
combustion gases are sucked into the combustion chamber by the induced draught
fan, is located below the fuel loading chamber. When the induced draught fan is used,
the combustion air around the pre-heating chamber door is sucked in and channelled
to the fuel via regulating flaps on the side air boxes (primary and secondary air). The
boiler water and flue gas temperature are regulated by the induced draught fan. The
primary air is used to adjust the boiler to the fuel and set the required output. The
secondary air is used to set the combustion performance by way of the Lambda probe
and servo-motor. The flue gas travels through the heat exchanger to the flue gas
outlet. In order to optimise heat transfer and for cleaning purposes, the heat
exchanger pipes are fitted with an Efficiency Optimisation System (WOS), which can
be operated using a lever or activated via a drive. The ash deposits at the bottom of
the combustion chamber and below the heat exchanger pipes can be removed via the
combustion chamber door on the front of the boiler.
General | 1
B1510723_en | Operating instructions Firewood boiler S4 Turbo (F) 5
1.2 S4 Turbo Product Overview
1.1
1Insulated door
1.1 Maintenance overview
2Fuel loading door
3Pre-heating chamber door
4Combustion chamber door with inspection glass
5Lambdatronic S 3200 control, Ü "Overview of the touch display" [}34]
6Lever for heat exchanger cleaning system (WOS)
7Actuators for automatic regulation of primary and secondary air
8Automatic ignition (optional)
9Back insulating cover
10 Heat exchanger cover: Maintenance opening for cleaning the WOS system and heat
exchanger
11 Main switch
12 Service port
13 STL high-limit thermostat
2 | Safety
6 B1510723_en | Operating instructions Firewood boiler S4 Turbo (F)
2 Safety
2.1 Hazard levels of warnings
This documentation uses warnings with the following hazard levels to indicate direct
hazards and important safety instructions:
DANGER
The dangerous situation is imminent and if measures are not observed it will lead
to serious injury or death. You must follow the instructions!
WARNING
The dangerous situation may occur and if measures are not observed it will lead to
serious injury or death. Work with extreme care.
CAUTION
The dangerous situation may occur and if measures are not observed it will lead to
minor injuries.
NOTICE
The dangerous situation may occur and if measures are not observed it will lead to
damage to property or pollution.
Safety | 2
B1510723_en | Operating instructions Firewood boiler S4 Turbo (F) 7
2.2 Pictograms used
The following symbols are used in the documentation and/or on the boiler to show what is
required and forbidden and to give warnings.
In accordance with the Machinery Directive, signs fitted directly within the danger area of
the boiler indicate immediate hazards or safety procedures. These stickers must not be
removed or covered.
Refer to the operating instructions Wear safety shoes
Wear protective gloves Turn off the main switch
Keep the doors closed
Unauthorised access prohibited
Warning - hot surface Warning - hazardous electrical
voltage
Warning - hazardous or irritant
materials
Warning - automatic boiler startup
Warning of injury to fingers or
hands, automatic fan
2 | Safety
8 B1510723_en | Operating instructions Firewood boiler S4 Turbo (F)
2.3 General safety information
DANGER
If the device is used incorrectly:
Incorrect use of the system can cause severe injury and damage.
When operating the system:
rObserve the instructions and information in the manuals
rObserve the details on procedures for operation, maintenance and cleaning, as well
as troubleshooting in the respective manuals.
rAny work above and beyond this (e.g. servicing) must be carried out by a heating
engineer approved by Fröling Heizkessel- und Behälterbau GesmbH or by Froling
customer services
WARNING
External influences:
Negative external influences, such as insufficient combustion air or non-standard
fuel, can cause serious faults in combustion (e.g. spontaneous combustion of
carbonisation gases or flash fires) which can in turn cause serious accidents!
When operating the boiler, please note the following:
rInstructions and information regarding versions and minimum values, as well as
standards and guidelines for heating components in the instructions must be
observed.
WARNING
Severe injuries and damage can be caused by an inadequate flue gas system.
Problems with the flue gas system, such as poor cleaning of the flue pipe or
insufficient chimney draught, can cause serious faults in combustion (such as
spontaneous combustion of carbonisation gases or flash fires).
Take the following precautions:
rOptimum boiler performance can only be guaranteed if the flue gas system is
functioning correctly.
Safety | 2
B1510723_en | Operating instructions Firewood boiler S4 Turbo (F) 9
2.4 Permitted uses
The Froling Firewood boiler S4 Turbo is designed solely for heating domestic water. Only
the fuels specified in the "Permitted fuels" section may be used.
Ü "Permitted fuels" [}10]
The unit should only be operated when it is in full working order. It must be operated in
accordance with the instructions, observing safety precautions, and you should ensure
you are aware of the potential hazards. The inspection and cleaning intervals in the
operating instructions must be observed. Ensure that any faults which might impair safety
are rectified immediately.
The manufacturer or supplier is not liable for any damage resulting from non-permitted
uses.
Only original spare parts or specific alternative spare parts authorised by the
manufacturer may be used. Any kind of change or modification made to the product will
invalidate the manufacturer’s conformity with the applicable guideline(s). In such cases,
the product will need to undergo new hazard evaluation procedures by the operator. The
operator will then be fully responsible for the declaration of conformity according to the
valid guideline(s) for the product and will need to issue a corresponding declaration for
the device. This person will then assume all of the rights and responsibilities of a
manufacturer.
2.4.1 The Clean Air Act 1993 and Smoke Control Areas
Under the Clean Air Act local authorities may declare the whole or part of the district of
the authority to be a smoke control area. It is an offence to emit smoke from a chimney of
a building, from a furnance or from any fixed boiler if located in a designated smoke
control area. It is also an offence to acquire an „unauthorised fuel“ for use within a smoke
control area unless it is used in an „exempt“ appliance („exempted“ from the controls
which generally apply in the smoke control area). The Secretary of State for Environment,
Food and Rural Affairs has powers under the Act to authorise smokeless fuels or exempt
appliances for use in smoke control areas in England. In Scotland and Wales this power
rests with Ministers in the devolved administrations for those countries. Separate
legislation, the Clean Air (Northern Ireland) Order 1981, applies in Northern Ireland.
Therefore it is a requirement that fuels burnt or obtained for use in smoke control areas
have been „authorised“ in Regulations and that appliances used to burn solid fuel in
those areas (other than „authorised“ fuels) have been exempted by an Order made and
signed by the Secretary of State or Minister in the devolved administrations.
Further information on the requirements of the Clean Air Act can be found here: http://
smokecontrol.defra.gov.uk
Your local authority is responsible for implementing the Clean Air Act 1993 including
designation and supervision of smoke control areas and you can contact them for details
of Clean Air Act requirements.
The Froling S4 Turbo 22, S4 Turbo 28, S4 Turbo 34, S4 Turbo 40, S4 Turbo 50 and S4
Turbo 60 have been recommended as suitable for use in smoke control areas when
burning fuels as listed under "Permitted fuels".
2 | Safety
10 B1510723_en | Operating instructions Firewood boiler S4 Turbo (F)
2.4.2 Permitted fuels
Firewood
Firewood up to max. 55 cm long.
Water content Water content (w) greater than 15% (equivalent to wood moisture u > 17%)
Water content (w) less than 25% (equivalent to wood moisture u < 33%)
Note on standards EU: Fuel as per EN ISO 17225 – Part 5: Firewood class A2 / D15 L50
Additional for
Germany: Fuel class 4 (§3 of the First Federal Emissions Protection Ordinance
(BimSchV) in the last amended version)
Tips for
storing wood Use wind-exposed areas where possible for storage (e.g. store at edge of forest instead of in
forest)
Walls of buildings facing the sun are ideal
Create a dry underlay, where possible with air access (line with round timber, pallets, etc.)
stack split wood and store in such a way that it is protected from the elements
If possible, stock fuel for the day in a warm place (e.g. in boiler room) (pre-heats the fuel!)
Safety | 2
B1510723_en | Operating instructions Firewood boiler S4 Turbo (F) 11
Storage time dependent upon water content
Wood type Water content
15 – 25% less than 15
%
Storage in heated and ventilated room
(approx. 20°C)
Soft wood (e.g.
spruce)
approx.
6months
from 1 year
Hardwood (e.g.
beech)
1 – 1.5 years from 2 years
Outdoor storage (protected from elements,
exposed to wind)
Soft wood (e.g.
spruce)
2 summers from 2 years
Hardwood (e.g.
beech)
3 summers from 3 years
Freshly cut wood has an approximate water content of 50 to 60%. As the above table
shows, the water content of the firewood decreases the longer the wood is stored
depending on how dry and warm the storage location is. The ideal water content of
firewood is between 15 and 25%. If the water content falls below 15%, we recommend
you adjust the combustion control to the fuel.
The air duct should be adjusted accordingly for optimal burning of these fuels (w < 15%).
Ü "Extra cleaning of flue gas paths" [}72]
2.4.3 Fuels permitted under certain conditions
Wood briquettes
Wood briquettes for non-industrial use with a diameter of 5-10 cm and 5-50 cm long.
Note on standards EU: Fuel as per EN ISO 17225 - Part 3:
wood briquettes class B / D100 L500 Form 1 - 3
Additional for
Germany: Fuel class 5a (§3 of the First Federal Emissions Protection Ordinance
(BImSchV) - applicable version)
Notes on
use When burning wood briquettes use the settings for extremely dry fuel
Wood briquettes must be heated up with firewood as per EN ISO 17225-5
(at least two layers of firewood under the wood briquettes)
The fuel loading chamber must not be filled more than 3/4 full, as the wood briquettes expand
during combustion
Even when using the settings for dry fuel, burning wood briquettes can cause combustion
problems. In such cases, repairs must be carried out by qualified staff. Please contact Froling
customer services or your installer.
2 | Safety
12 B1510723_en | Operating instructions Firewood boiler S4 Turbo (F)
2.4.4 Non-permitted fuels
The use of fuels other than those defined in the "Permitted fuels" section, and particularly
the burning of refuse, is not permitted
NOTICE
In case of use of non-permitted fuels:
Burning non-permitted fuels increases the cleaning requirements and leads to a
build-up of aggressive sedimentation and condensation, which can damage the
boiler and also invalidates the guarantee! Using non-standard fuels can also lead
to serious problems with combustion!
For this reason, when operating the boiler:
rUse only the permitted fuels
2.5 Qualification of operating staff
CAUTION
If unauthorised persons enter the Installation room / boiler room:
Risk of personal injury and damage to property
rThe operator is responsible for keeping unauthorised persons, in particular children,
away from the system.
Only trained operators are permitted to operate the unit. The operator must also have
read and understood the instructions in the documentation.
2.6 Protective equipment for operating staff
You must ensure that staff have the protective equipment specified by accident
prevention regulations!
For operation, inspection and cleaning:
- suitable work wear
- protective gloves
- sturdy shoes
- dust mask
Safety | 2
B1510723_en | Operating instructions Firewood boiler S4 Turbo (F) 13
2.7 Safety devices
11 13
TA SV
Underneath the back insulating cover (9):
11 MAIN SWITCH (switches off the power supply)
For shutting down the entire system
rThe power to all components is switched off.
ÄWARNING! Only switch off the boiler when it has burnt down and cooled off.
13 HIGH-LIMIT THERMOSTAT (STL) (protection against overheating)
The STL switches off the combustion system when the boiler reaches 105°C. The pumps
continue to run. Once the temperature falls below approx. 75°C, the STL can be reset
mechanically.
TA THERMAL DISCHARGE VALVE (protection against overheating)
The thermal discharge valve opens a valve at approx. 100°C and feeds cold water to the
safety heat exchanger to lower the boiler temperature
SV SAFETY VALVE (protection against overheating/excessive pressure)
When the boiler pressure reaches a maximum of 3 bar, the safety valve opens and the
heated water is blown off in the form of steam.
2 | Safety
14 B1510723_en | Operating instructions Firewood boiler S4 Turbo (F)
2.8 Residual risks
WARNING
When the main switch is switched off in heating mode:
The boiler is placed in an uncontrolled state. Any resulting boiler malfunctions can
cause serious injury and damage.
Therefore:
rAllow the fire to burn out completely and let the boiler cool, only then switch off the
main switch.
ÄID fan switches off when "Off" status has been reached
(flue gas temperature < 80 °C, boiler temperature < 65 °C)
WARNING
When touching hot surfaces:
Severe burns are possible on hot surfaces and the flue gas pipe!
When work is carried out on the boiler:
rShut down the boiler according to procedure (“Off” operating status) and allow it to
cool down
rProtective gloves must usually be worn for work on the boiler, and it should only be
operated using the handles provided
rInsulate the flue gas pipes and do not touch them during operation
WARNING
If you open the combustion chamber door, pre-heating door, fuel loading door during
operation:
This may result in injury, damage or flue gas generation!
Take the following precautions:
rDo not open the combustion chamber door or pre-heating chamber door while the
boiler is running
rKeep the fuel loading door closed during operation and only open briefly during
reloading intervals
rProtective gloves must be worn for work on the boiler, and it should only be operated
using the handles provided
WARNING
If non-permitted fuel types are used:
Non-standard fuels can cause serious faults in combustion (e.g. spontaneous
combustion of carbonisation gases / flash fires) which can lead to serious
accidents!
Take the following precautions:
rOnly use fuels specified in the "Permitted fuels" section of these operating
instructions.
Safety | 2
B1510723_en | Operating instructions Firewood boiler S4 Turbo (F) 15
WARNING
When inspecting and cleaning the boiler with the main switch on:
Serious injuries possible due to boiler/individual components starting up
automatically (induced draught)!
Before inspection and cleaning work in/on the boiler:
rAllow the fuel in the boiler to burn off
rAllow boiler to cool off and switch off main switch
NOTICE
Automatic ignition set incorrectly or not carried out
Possible damage to equipment from frost, etc.
Take the following precautions:
rCheck the start time that has been set for automatic ignition
rAfter a short time, ensure that automatic ignition has been carried out successfully
ÄDue to differing fuel compositions, Froling cannot guarantee successful automatic
ignition. The manufacturer/supplier is not responsible for resulting damage.
2.9 Emergency procedure
2.9.1 Overheating of the system
If the system overheats and the safety devices fail to operate, proceed as follows:
NOTICE!Do not under any circumstances switch off the main switch or disconnect
the power supply.
rKeep all the doors on the boiler closed
rSwitch boiler off by tapping “Boiler OFF”
rOpen all mixing valve taps, switch on all pumps.
ÄThe Froling heating circuit control takes on this function in automatic operation.
rLeave the boiler room and close the door
rOpen any thermostatic valves on the radiator and ensure sufficient heat dissipation
from the rooms
If the temperature does not drop:
rContact the installer or Froling customer services
2 | Safety
16 B1510723_en | Operating instructions Firewood boiler S4 Turbo (F)
2.9.2 Smell of flue gas
DANGER
If you smell flue gas in the boiler room:
Inhaling toxic flue gas can potentially be fatal!
If you smell flue gas in the room where the boiler is installed:
rKeep all the doors on the boiler closed
rVentilate the room where the boiler is installed
rClose the fire door and doors to living areas
rAllow the fire to burn out completely and let the boiler cool
Recommendation: Do not install smoke alarms and carbon monoxide detectors near the
system.
2.9.3 Power failure / induced draught fan failure
A power failure, among others, can be identified based on the following points:
Display remains dark despite touching it
LED status does not flash / light up
No noise from the units (e.g. induced draught fan) can be heard
If the induced draught fan fails when there is power supply, the display shows the error
message “ID fan does not rotate, in spite of full activation”.
DANGER
In the event of a power failure or induced draught fan failure during heating mode:
The boiler is placed in an uncontrolled state. Life-threatening injury is possible
when opening the doors.
What to do in the event of a power failure / induced draught fan failure:
rKeep all the doors on the boiler closed
rVentilate the room where the boiler is installed
rClose the fire door and doors to living areas
rAllow the fire to burn out completely and let the boiler cool
Recommendation: Equip the boiler with an uninterruptible power supply (USV,
photovoltaic system, etc.). This ensures correct combustion of the firewood and prevents
possible uncontrolled conditions (tarring of the heat exchanger, etc.).
Recommendation: Do not install smoke alarms and carbon monoxide detectors near the
system.
Safety | 2
B1510723_en | Operating instructions Firewood boiler S4 Turbo (F) 17
2.9.4 Fire in the system
DANGER
In case of fire in the system:
Risk of death by fire and poisonous gases
Emergency procedure in case of fire:
rLeave the boiler room
rClose the doors
rInform the fire department
3 | Notes for operating a heating system
18 B1510723_en | Operating instructions Firewood boiler S4 Turbo (F)
3 Notes for operating a heating system
Carrying out modifications to the system and changing or disabling safety equipment is
prohibited.
Always comply with all fire, building and electrical regulations when installing or operating
the system, in addition to following the operating instructions and mandatory regulations
that apply in the country in which the tank is operated.
3.1 Installation and approval
The boiler should be operated in a closed heating system. The following standards
govern the installation:
Note on standards EN 12828 - Heating Systems in Buildings
IMPORTANT: Every heating system must be officially approved.
The appropriate supervisory authority (inspection agency) must always be informed when
installing or modifying a heating system, and authorisation must be obtained from the
building authorities:
Austria: report to the construction authorities of the community or magistrate
Germany: report new installations to an approved chimney sweep / the building
authorities.
3.2 Installation site
Requirements for the load bearing substrate:
Flat, clean and dry
Non-combustible and with sufficient load-bearing capacity
Conditions at the installation site:
▪ Frost-free
Sufficiently well lit
Free of explosive atmospheres such as flammable substances, hydrogen halides,
cleaning agents and consumables
Installation at altitude higher than 2000 metres above sea level only after consultation
with the manufacturer
The system must be protected against gnawing and nesting by animals (such as
rodents)
No flammable materials in proximity to the system
Observe national and regional regulations regarding the installation of smoke and
carbon monoxide detectors
Notes for operating a heating system | 3
B1510723_en | Operating instructions Firewood boiler S4 Turbo (F) 19
3.3 Combustion air
12
4
3
1Boiler in room air-dependent operation
2Air extraction system (such as centralised dust extraction system, room ventilation)
3Under-pressure monitoring system
4Combustion air supply from outside
3.3.1 Combustion air supply at the installation room
The system is operated in open flue mode, i.e. the combustion air required to operate the
boiler is drawn from the installation room.
Requirements:
Opening to the atmosphere
Weather conditions must not affect the air flow in any way (e.g. snow and foliage)
Cross-section area free of obstructions such as cover gratings and slats
Air supply lines
For air supply lines longer than 2 metres and where mechanical means are used
to feed combustion air, the flow rate must be calculated (maximum flow rate = 1 m/
s)
Note on standards ÖNORM H 5170 - Construction and fire protection requirements
3 | Notes for operating a heating system
20 B1510723_en | Operating instructions Firewood boiler S4 Turbo (F)
3.3.2 Simultaneous operation with other air-drawing systems
Where the boiler is operated in room air-dependent mode with simultaneous operation of
other air-drawing systems (such as room ventilation), safety devices are necessary:
Air pressure monitor
Flue gas thermostat
Window-tilting drive system, window-tilting switch
NOTICE!Clarify the safety devices with appropriate flue sweep / chimney sweep
Recommendation for room ventilation:
Use “intrinsically-safe” room ventilation systems with F classification
As a basic rule:
Room under-pressure max. 8Pa
Air-drawing systems must not exceed the room under-pressure value
If the room under-pressure value is exceeded, safety equipment (under-pressure
monitoring system) is necessary
In Germany, the following additional requirement must be observed:
A gauge that monitors the negative pressure gauge (e.g. air pressure sensor P4) and is
approved by the DIBt (German Technical Authority in the Construction Sector) must be
used. This monitor tracks the maximum negative pressure of 4 Pa at the installation site.
In addition, at least one of the following three requirements must be met:
(Source: Section 4 MFeuV 2007 / 2010)
Dimension the cross-section of the combustion air opening so that when the boiler is
in operation the maximum under-pressure is not exceeded (simultaneous operation)
Use safety equipment that prevents simultaneous operation (alternate operation)
Monitor the flue gas outlet using safety devices (such as a flue gas thermostat)
Simultaneous operation
An approved safety system (such as an air pressure monitor) ensures that during
simultaneous operation of the boiler and the air-drawing appliance the pressure
conditions are maintained. In the event of a fault, the safety system will switch off one of
the air-drawing systems.
Alternating operation
An approved safety system (such as a flue gas thermostat) ensures (e.g. by switching off
the power supply) that the boiler cannot be operated simultaneously with the air-drawing
appliance.
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Froling S4 Turbo Owner's manual

Category
Thermostats
Type
Owner's manual

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