Fröling PE1 Pellet 7 User manual

Installation Instructions
Pellet boiler PE1 Pellet 7-35 / PE1 Pellet Unit 7-20
PE1 Pellet 7-35 PE1 Pellet Unit 7-20
Translation of the original German installation instructions for technicians
Read and follow the instructions and safety information!
Technical changes, typographical errors and omissions reserved!
M1441420_en | Edition 10/01/2020
Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com

Contents
1 General 5
2 Safety 6
2.1 Hazard levels of warnings 6
2.2 Qualification of assembly staff 7
2.3 Personal protective equipment for assembly staff 7
3 Design Information 8
3.1 Notes on standards 8
3.1.1 General standards for heating systems 8
3.1.2 Standards for structural and safety devices 8
3.1.3 Standards for heating water 8
3.1.4 Regulations and standards for permitted fuels 9
3.2 Installation and approval of the heating system 10
3.3 General information for installation room (boiler room) 10
3.4 Requirements for central heating water 11
3.5 Notes for using pressure maintenance systems 13
3.6 Use with storage tank 13
3.7 Chimney connection/chimney system 14
3.7.1 Draught limiter 15
3.7.2 Measuring port 15
3.8 Room air-independent operation 15
3.9 Air supply in the installation room 16
3.10 Note on installing an external combustion air supply 18
3.11 Simultaneous operation with other air-drawing systems (room ventilation, cooker
hood, centralised dust extraction system, etc.)
19
3.11.1 Room air-independent appliance 20
3.11.2 Room air-dependent appliance 20
3.11.3 Requirements for operating the room air-dependent appliance simultaneously with an air-
drawing system (e.g. with a room ventilation system, centralised dust extraction system, etc.)
21
3.12 Boiler ventilation 21
4 Technology 22
4.1 Dimensions - PE1 Pellet 7-35 22
4.2 Dimensions - PE1 Pellet Unit 7-20 23
4.3 Connections - PE1 Pellet 7-35 24
4.4 Components and connections - PE1 Pellet Unit 7-20 25
4.5 Technical specifications 26
4.5.1 PE1 Pellet 7-10 / PE1 Pellet Unit 7-10 26
4.5.2 PE1 Pellet 15-20 / PE1 Pellet Unit 15-20 27
4.5.3 PE1 Pellet 25-30 28
4.5.4 PE1 Pellet 32-35 29
4.5.5 Boiler data for planning the flue gas system 31
4.6 External suction module 32
Contents
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5 Assembly 33
5.1 Included in delivery 33
5.2 Tools required 34
5.3 Transport 35
5.4 Positioning 36
5.5 Temporary storage 37
5.6 Setting up in the boiler room 38
5.6.1 Moving the boiler in the boiler room 38
5.6.2 Operating and maintenance areas of the equipment 38
5.7 Install PE1 Pellet 39
5.7.1 Remove boiler from pallet 39
5.7.2 PE1 Pellet 25-35 – Prepare the boiler for transport and setup 41
5.7.3 Aligning the boiler on the floor 43
5.7.4 Prepare for room air-independent operation 44
5.8 Install the PE1 Pellet Unit 45
5.8.1 Remove boiler from pallet 45
5.8.2 Align the boiler with the floor 46
5.8.3 Install boiler filling and drainage system 47
5.8.4 Expansion with electronic heating cartridge (optional) 48
5.8.5 Install the connection set for room air-independent operation (optional) 48
5.8.6 Expansion with pipe assembly for storage loading (optional) 50
5.8.7 Expansion with pump assembly for second heating circuit (optional) 51
5.8.8 Fit the front cover 54
5.8.9 Disassembling to make transporting the PE1 Pellet Unit easier 55
5.9 Installing the discharge system 57
5.9.1 Installing the external suction module 57
5.9.2 Connect the suction hoses to the boiler 59
5.9.3 Assembly information for hose lines 60
Potential equalisation 61
5.10 Install the protective plate for the flue pipe 62
5.11 Electrical Connection 63
5.11.1 Information on circulating pumps 65
5.12 Final installation steps 66
6 Start-up 67
6.1 Filling the system with drinking water 67
6.2 Before commissioning / configuring the boiler 68
6.3 Initial startup 69
6.3.1 Permitted fuels 69
Wood pellets 69
6.3.2 Non-permitted fuels 69
6.3.3 Heating up for the first time 69
7 Decommissioning 70
7.1 Mothballing 70
7.2 Disassembly 70
7.3 Disposal 70
8 Notes 71
Contents
Installation Instructions PE1 Pellet 7-35 / PE1 Pellet Unit 7-20 | M1441420_en 3

9 Appendix 72
9.1 Addresses 72
9.1.1 Address of manufacturer 72
Customer service 72
9.1.2 Address of the installer 72
Contents
4 Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com

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
know: [email protected].
Subject to technical change.
The EC Declaration of Conformity is only valid in conjunction with a delivery certificate,
which has been filled in correctly and signed as part of the commissioning process.
The original document remains at the installation site. Commissioning installers or
heating engineers are requested to return a copy of the delivery certificate together
with the guarantee card to Froling. On commissioning by FROLING Customer Service
the validity of the delivery certificate will be noted on the customer service record.
Issuing a delivery
certificate
General 1
Installation Instructions PE1 Pellet 7-35 / PE1 Pellet Unit 7-20 | M1441420_en 5

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.
2Safety
Hazard levels of warnings
6 Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com

2.2 Qualification of assembly staff
CAUTION
Assembly and installation by unqualified persons:
Risk of personal injury and damage to property
During assembly and installation:
❒ Observe the instructions and information in the manuals
❒ Only allow appropriately qualified personnel to work on the system
Assembly, installation, initial startup and servicing must always be carried out by
qualified personnel:
- Heating technician / building technician
- Electrical installation technician
- Froling customer services
The assembly staff must have read and understood the instructions in the
documentation.
2.3 Personal protective equipment for assembly staff
You must ensure that staff have the protective equipment specified by accident
prevention regulations.
▪ For transportation, setup and assembly:
- suitable work wear
- protective gloves
- sturdy shoes (min. protection class S1P)
Safety 2
Qualification of assembly staff
Installation Instructions PE1 Pellet 7-35 / PE1 Pellet Unit 7-20 | M1441420_en 7

3 Design Information
3.1 Notes on standards
The system must be installed and commissioned in accordance with the local fire and
building regulations. Unless contrary to other national regulations, the latest versions
of the following standards and guidelines apply:
3.1.1 General standards for heating systems
EN 303-5 Boilers for solid fuels, manually and automatically fed
combustion systems, nominal heat output up to 500 kW
EN 12828 Heating systems in buildings - design of water-based heating
systems
EN 13384-1 Chimneys - Thermal and fluid dynamic calculation methods
Part 1: Chimneys serving one appliance
ÖNORM H 5151 Planning of central hot water heating systems with or without hot
water preparation
ÖNORM M 7510-1 Guidelines for checking central heating systems
Part 1: General requirements and one-off inspections
ÖNORM M 7510-4 Guidelines for checking central heating systems
Part 4: Simple check for heating plants for solid fuels
3.1.2 Standards for structural and safety devices
ÖNORM H 5170 Heating installation - Requirements for construction and safety
engineering, as well as fire prevention and environmental
protection
ÖNORM M 7137 Compressed untreated wood – Requirements for storing pellets
at the end customer’s site
TRVB H 118 Technical directives for fire protection/prevention (Austria)
3.1.3 Standards for heating water
ÖNORM H 5195-1 Prevention of damage by corrosion and scale formation in
closed warm water heating systems at operating temperatures
up to 100°C (Austria).
VDI 2035 Prevention of damage hot water heating systems (Germany)
3Design Information
Notes on standards
8 Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com

SWKI BT 102-01 Water quality for heating, steam, cooling and air conditioning
systems (Switzerland)
UNI 8065 Technical standard regulating hot water preparation.
DM 26.06.2015 (Ministerial Decree specifying the minimum
requirements)
Follow the instructions of this standard and any related updates.
(Italy)
3.1.4 Regulations and standards for permitted fuels
1. BImSchV First Order of the German Federal Government for the
implementation of the Federal Law on Emission Protection
(Ordinance on Small and Medium Combustion Plants) in the
version published on 26 January 2010,
BGBl. JG 2010 Part I No. 4.
EN ISO 17225-2 Solid bio-fuel - Fuel specifications and classes
Part 2: Wood pellets for use in industrial and domestic systems
Design Information 3
Notes on standards
Installation Instructions PE1 Pellet 7-35 / PE1 Pellet Unit 7-20 | M1441420_en 9

3.2 Installation and approval of the heating system
The boiler should be operated in a closed heating system. The following standards
govern the installation:
EN 12828 - Heating Systems in Buildings
NOTICE! Each 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.
3.3 General information for installation room (boiler room)
Boiler room characteristics
▪ The floor must be even, clean and dry and have an adequate load-bearing
capacity.
▪ There must not be a potentially explosive atmosphere in the boiler room as the
boiler is not suitable for use in potentially explosive environments.
▪ The boiler room must be frost-free.
▪ The boiler does not provide any light, so the customer must ensure sufficient
lighting in the boiler room in accordance with national workplace design
regulations.
▪ When using the boiler above 2000 metres above sea level you should consult the
manufacturer.
▪ Danger of fire due to flammable materials.
The floor of the boiler room must not be flammable. No flammable materials
should be stored near the boiler. Flammable objects (e.g. clothing) must not be put
on the boiler to dry.
▪ Damage due to impurities in combustion air.
Do not use any solvents or cleaning agents containing chlorine and hydrogen
halides in the room where the boiler is installed (e.g. chlorination units for
swimming pools).
▪ Keep the air suction opening of the boiler free of dust.
▪ The system must be protected against the chewing or nesting of animals (e.g.
rodents etc.).
Ventilation of the boiler room
Ventilation air for the boiler room should be taken from and expelled directly outside,
and the openings and air ducts should be designed to prevent weather conditions
(foliage, snowdrifts, etc.) from obstructing the air flow.
Note on standards
3Design Information
Installation and approval of the heating system
10 Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com

Unless otherwise specified in the applicable building regulations for the boiler room,
the following standards apply to the design and dimensions of the air ducts:
ÖNORM H 5170 - Construction and fire protection requirements
TRVB H118 - Technical directives on fire protection/prevention
3.4 Requirements for central heating water
Unless contrary to other national regulations, the latest versions of the following
standards and guidelines apply:
Austria:
Germany:
ÖNORM H 5195
VDI 2035
Switzerland
:
Italy:
SWKI BT 102-01
UNI 8065
Observe the standards and also follow the recommendations below:
❒ Aim for a pH value of between 8.2 and 10.0. If the central heating water comes
into contact with aluminium, the pH value must be between 8.0 and 8.5
❒ Use prepared water which complies with the standards cited above for filling and
make-up water
❒ Avoid leaks and use a closed heating system to maintain water quality during
operation
❒ When filling with make-up water, always bleed the filling hose before connecting,
in order to prevent air from entering the system
Note on standards
Design Information 3
Requirements for central heating water
Installation Instructions PE1 Pellet 7-35 / PE1 Pellet Unit 7-20 | M1441420_en 11

Advantages of prepared water:
▪ Complies with the applicable standards
▪ Less of a drop in output due to reduced limescale build-up
▪ Less corrosion due to fewer aggressive substances
▪ Long-term cost savings thanks to improved energy efficiency
Permitted water hardness for the fill and make-up water in accordance with VDI 2035:
Overall heat
output
Total hardness at
<20 l/kW minimum
individual heat output 1)
Total hardness at
>20 ≤50 l/kW minimum
individual heat output 1)
Total hardness at
>50 l/kW minimum
individual heat output 1)
kW °dH mol/m³ °dH mol/m³ °dH mol/m³
≤50 no demand or 11.2 2 0.11 0.02
<16.8 2) <3 2)
>50 ≤200 11.2 2 8.4 1.5
>200 ≤600 8.4 1.5 0.11 0.02
>600 0.11 0.02
1.From specific system volume (litres nominal capacity/heat output; for multi-boiler systems use the smallest individual heat output)
2.In the case of systems with central heating boilers and for systems with electric heating elements
Additional requirements for Switzerland
The filling and make-up water must be demineralised (fully purified)
▪ The water must not contain any ingredients that could settle and accumulate in the
system
▪ This makes the water non-electroconductive, which prevents corrosion
▪ It also removes all the neutral salts such as chloride, sulphate and nitrate which can
weaken corrosive materials in certain conditions
If some of the system water is lost, e.g. during repairs, the make-up water must also be
demineralised. It is not enough to soften the water. The heating system must be
professionally cleaned and rinsed before filling the units.
Inspection:
▪ After eight weeks, the pH value of the water must be between 8.2 and 10.0. If the central
heating water comes into contact with aluminium, the pH value must be between 8.0 and
8.5
▪ Yearly. Values must be recorded by the owner
3Design Information
Requirements for central heating water
12 Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com

3.5 Notes for using pressure maintenance systems
Pressure maintenance systems in hot-water heating systems keep the required
pressure within predefined limits and balance out volume variations caused by
changes in the hot-water temperature. Two main systems are used:
Compressor-controlled pressure maintenance
In compressor-controlled pressure maintenance units, a variable air cushion in the
expansion tank is responsible for volume compensation and pressure maintenance. If
the pressure is too low, the compressor pumps air into the tank. If the pressure is too
high, air is released by means of a solenoid valve. The systems are built solely with
closed-diaphragm expansion tanks to prevent the damaging introduction of oxygen
into the heating water.
Pump-controlled pressure maintenance
A pump-controlled pressure maintenance unit essentially consists of a pressure-
maintenance pump, relief valve and an unpressurised receiving tank. The valve
releases hot water into the receiving tank if the pressure is too high. If the pressure
drops below a preset value, the pump draws water from the receiving tank and feeds it
back into the heating system. Pump-controlled pressure maintenance systems with
open expansion tanks (e.g. without a diaphragm) introduce ambient oxygen via the
surface of the water, exposing the connected system components to the risk of
corrosion. These systems offer no oxygen removal for the purposes of corrosion
control as required by VDI 2035 and in the interests of corrosion protection should not
be used.
3.6 Use with storage tank
NOTICE
In principle it is not necessary to use a storage tank for the system to run
smoothly. However, we recommend that you use the system with a storage tank,
as this ensures a continuous supply of fuel in the ideal output range of the boiler.
For the correct dimensions of the storage tank and the line insulation (in accordance
with ÖNORM M 7510 or guideline UZ37) please consult your installer or Froling.
⇨ See "Addresses" [page 72]
Design Information 3
Notes for using pressure maintenance systems
Installation Instructions PE1 Pellet 7-35 / PE1 Pellet Unit 7-20 | M1441420_en 13

3.7 Chimney connection/chimney system
EN 303-5 specifies that the entire flue gas system must be designed to prevent,
wherever possible, damage caused by seepage, insufficient feed pressure and
condensation. Please note in this respect that flue gas temperatures lower than 160K
above room temperature can occur in the permitted operating range of the boiler.
The flue gas temperatures (for clean systems) and additional flue gas values can be
found in the table below.
The connection between the boiler and the chimney system should be as short as
possible. The upward angle of the connection should not exceed 30 - 45°. Insulate the
connection. The entire flue gas system - chimney and connection - should be
calculated in accordance with EN 13384-1.
Local regulations and other statutory regulations also apply.
NOTICE! The chimney must be authorised by a smoke trap sweeper or chimney
sweep.
NOTICE! TRVB H 118 (Austria only) stipulates that an explosion flap must be installed
in the connecting piece (flue pipe) directly next to the boiler. It should be situated in
such a way that is poses no risk to persons!
3Design Information
Chimney connection/chimney system
14 Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com

3.7.1 Draught limiter
We generally recommend the installation of a draught limiter. A draught limiter must
be installed if the maximum permissible feed pressure as given in the boiler data for
planning the flue gas system is exceeded.
NOTICE! Install the draught limiter directly under the mouth of the flue line, as the
pressure is constantly low at this point.
3.7.2 Measuring port
For measuring the emissions of the system, a suitable measuring port must be
installed in the connecting piece between the boiler and chimney system.
D
D
M
2 x D
In front of the measuring port (M) a straight inlet section should be located at a
distance corresponding to about twice the diameter (D) of the connecting piece. A
straight outlet section at a distance corresponding to about the single diameter of the
connecting piece should be provided after the measuring port. The measuring port
must remain closed whenever the system is in operation.
The diameter of the measuring probe used by Froling customer service is 14 mm. To
avoid measuring errors due to the ingress of false air, the diameter of the measuring
port must not exceed 21 mm.
3.8 Room air-independent operation
The PE1 Pellet has a central air connection on the back of the boiler. If appropriate
supply air and flue gas connections are installed, the boiler can be classified according
to EN 15035 as a type C42 / type C82 or according to DIBt as a type FC42x / type FC52x.
The conditions for room air-independent operation of the boiler at the installation site
must be clarified with the local authority responsible (authority, chimney sweep, ...).
Definitions as per EN 15035
Boiler that is connected via its combustion air supply and flue gas outlet, with a
connecting piece that may be supplied, to a shared chimney with a shaft for
combustion air supply and a shaft for flue gas outlet. The mouths of the air and flue
gas chimney are either concentric or so close to each other that similar wind
conditions apply.
NOTICE! Air is supplied by an air and flue gas system!
Type C4
Design Information 3
Chimney connection/chimney system
Installation Instructions PE1 Pellet 7-35 / PE1 Pellet Unit 7-20 | M1441420_en 15

A boiler that is connected via its combustion air supply and flue gas outlet, with a
connecting piece, to a wind protection device and a single or shared chimney.
NOTICE! Air supply via an air supply line that is independent from the chimney
system!
NOTICE! This design requires a wind protection device. If a protective grating is fitted,
you must ensure that the mesh size is sufficiently large to prevent a significant loss of
pressure and/or seal from dirt!
The second index "2" (C42 / C82) indicates type C boilers with a blower fan downstream
of the combustion chamber or the heat exchanger.
Definitions as per DIBt
One appliance with flue gas fan for connection to an air/flue system. The combustion
air line from the air shaft and the connecting piece to the chimney are part of the
appliance.
One appliance with flue gas fan for connection to a chimney. The combustion air line
from the air shaft and the connecting piece to the chimney are part of the appliance.
When dimensioning pipe bends in the supply air line you should note that:
The ratio of the radius of curvature (r) to pipe diameter (d) should be greater than 1
r:d ≥ 1
For example:
- Diameter of supply air connection = 60 mm
- Minimum radius of pipe bends = 60 mm
Install the supply air line in as straight a line as possible and over the shortest path.
Keep the number of pipe bends to a minimum.
In addition, the following applies: The maximum resistance of the supply air line is 20
Pa!
You can find the necessary dimensions of the supply air connections in the boiler in
the technical data sheets.
3.9 Air supply in the installation room
The system is operated in open flue mode, i.e. the combustion air required to operate
the pellet boiler is drawn from the installation room.
Requirements for the supply of combustion air to the installation room:
▪ Observe the following at the combustion air opening leading outside:
– Weather conditions must not affect the air flow in any way (e.g. snow and
foliage)
– The free cross-sectional area must be maintained taking into account e.g.
covering grid plates, slats, etc.
Type C8
Type FC42x
Type FC52x
3Design Information
Air supply in the installation room
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▪ If air lines exceed 2 m or if the combustion air is discharged mechanically, the flow
rate must be calculated (maximum flow rate = 1 m/s)
NOTICE! Observe the standards cited in these instructions as well as other national
and local regulations!
⇨ See "Note on standards" [page 8]
Design Information 3
Air supply in the installation room
Installation Instructions PE1 Pellet 7-35 / PE1 Pellet Unit 7-20 | M1441420_en 17

3.10 Note on installing an external combustion air supply
NOTICE! Install the combustion air supply (piping) in accordance with the applicable
standards
⇨ See "Notes on standards" [page 8]
❒ Connect supply air duct to the connection provided (external combustion air) on
the pellet boiler and make sure that it is properly sealed.
Condensation
Supply air ducts are normally led along cellar ceilings to the appliance. The
temperature difference between the cold air drawn from outside and the room
temperature inside the building shell inevitably results in condensation, usually at the
unprotected metal air lines.
NOTICE! The greater the temperature difference between the outside air temperature
and room temperature, the greater the risk of condensation
In Germany, the following additional requirement must be observed: The lines must be
installed with an incline making sure that any condensation water can drain away and
the outside air can be drawn in without allowing water or animals from entering the
building.
To avoid condensation:
❒ Line the supply air duct with sufficient heat insulation
➥Depends on the average room temperature and the temperature of the outside
air, as well as the local conditions
➥The surface temperature must be higher than the room temperature's dew
point even in unfavourable weather conditions (cold winters)
3Design Information
Note on installing an external combustion air supply
18 Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com

3.11 Simultaneous operation with other air-drawing systems (room
ventilation, cooker hood, centralised dust extraction system, etc.)
1 PE1 Pellet 5 Under-pressure monitoring system1)
2 Room ventilation 6 Window-tilting switch/drive system2)
(installed by customer)
3 Centralised dust extraction system 7 Combustion air supply from outside
4 Cooker hood with extraction mode 8 Outside air
1.An under-pressure monitoring system switches air-drawing systems (e.g. room ventilation, etc.) off when the under-pressure in the
installation room exceeds a certain limit. This prevents a reversal of the combustion gas flow in the chimney and thus smoke from being
sucked back into the installation room.
2.A window-tilting switch prevents major air-drawing systems (e.g. 3 or 4) from operating with the window closed. A drive systems tilts the
window open when air-drawing systems (e.g. 3 or 4) are in operation. This prevents a reversal of the combustion gas flow in the chimney
and thus smoke from being sucked back into the installation room.
The following applies if the appliance is to be operated in conjunction with other air-
drawing systems:
❒ The possibility of simultaneous operation of appliance and other air-drawing
systems (e.g. room ventilation) must be clarified in advance with the responsible
chimney sweep
❒ Observe the chimney sweep's assessment criteria
➥These apply until an appropriate regulation has been published
❒ Only use approved safety equipment (e.g. under-pressure monitoring system and/
or window-tilting switch with DIBt certification [DE])
❒ Make sure that the combustion air supply line and the connecting piece are
properly sealed at the chimney. Any flexible aluminium pipes used for the supply
air line must be protected against mechanical loads.
Design Information 3
Simultaneous operation with other air-drawing systems (room ventilation, cooker hood, centralised
dust extraction system, etc.)
Installation Instructions PE1 Pellet 7-35 / PE1 Pellet Unit 7-20 | M1441420_en 19

3.11.1 Room air-independent appliance
The pellet boiler is suitable for room air-independent operation up to a maximum
permissible room-side under-pressure of 8 Pa. Provided the permissible room-side
under-pressure limit is not exceeded, there are no restrictions regarding simultaneous
operation of air-drawing systems (e.g. with a room ventilation system). If the under-
pressure in the installation room is higher than the permissible under-pressure limit,
the appliance is classified as room air-dependent and must be equipped with a safety
system (under-pressure monitoring system).
In Germany, the following additional requirement must be observed: An under-
pressure monitoring system approved according to DiBt (e.g. P4 air pressure alarm)
must be fitted. This system must monitor the maximum under-pressure of 4 Pa in the
installation room.
3.11.2 Room air-dependent appliance
In the case of room air-dependent appliances, some restrictions apply regarding
simultaneous operation of air-drawing systems (e.g. with a room ventilation system,
etc.). Safety equipment is required in these cases.
As a basic rule:
▪ When operating air-drawing systems (e.g. room ventilation, etc.) simultaneously
with a room air-dependent appliance, the room-side under-pressure must not
exceed 4 Pa.
In addition, at least one of the following three requirements must be met:
(Source: Section 4 MFeuV 2007 / 2010)
▪ Use safety equipment that prevents simultaneous operation of appliance and other
air-drawing systems
OR
▪ Monitor the extraction of the flue gas using special safety equipment
OR
▪ Make sure that the outside air lines required for the appliance are isolated from the
outside air lines required for the ventilation system. This ensures that no
dangerous under-pressure can develop while operating the appliance.
Simultaneous operation
A safety system must ensure that no dangerous under-pressure can develop when the
systems are operated simultaneously. In the event of a fault, the safety system will
switch off one of the air-drawing systems (e.g. the room ventilation system, etc.).
Alternating operation
An approved safety system (e.g. based on under-pressure or temperature readings)
must ensure that the air-drawing system and the appliance cannot be operated at the
same time. Any further processing of the signals must also comply with this safety
philosophy. Shutting down the power supply is permitted and sufficient.
3Design Information
Simultaneous operation with other air-drawing systems (room ventilation, cooker hood, centralised
dust extraction system, etc.)
20 Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com