Froling P4 Pellet 8 - 105 User manual

Installation Instructions
Pellet Boiler P4 Pellet 8 - 105
Translation of the original German installation instructions for technicians
Read and follow the instructions and safety information!
Technical changes, typographical errors and omissions reserved!
M0931113_en | Edition 25/02/2014
Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com

Version of 27 Oct 2011
Page 1 of 7
SUPPLEMENTARY INSTALLATION INSTRUCTIONS FOR THE UK MARKET
TO BE READ IN CONJUNCTION WITH THOSE IN THE MAIN INSTRUCTION MANUAL
These instructions together with those in the instruction manual cover the basic principles
to ensure the satisfactory installation of the boiler, although detail may need slight
modification to suit particular local site conditions.
In all cases the installation must comply with current Building Regulations, Local Authority
Byelaws and other specifications or regulations as they affect the installation of the boiler.
It should be noted that the Building Regulations requirements may be met by adopting the
relevant recommendations given in British Standards BS 8303, BS EN15287-1:2007 as an
alternative means to achieve an equivalent level of performance to that obtained following
the guidance given in Approved Document J.
Please note that it is a legal requirement under England and Wales Building Regulations
that the installation of the boiler is either carried out under Local Authority Building Control
approval or is installed by a Competent Person registered with a Government approved
Competent Persons Scheme. HETAS Ltd operate such a Scheme and a listing of their
Registered Competent Persons can be found on their website at www.hetas.co.uk.
CO Alarms:-
Building regulations require that when ever a new or replacement fixed solid fuel or
wood/biomass appliance is installed in a dwelling a carbon monoxide alarm must be fitted
in the same room as the appliance. Further guidance on the installation of the carbon
monoxide alarm is available in BS EN 50292:2002 and from the alarm manufacturer’s
instructions. Provision of an alarm must not be considered a substitute for either installing
the appliance correctly or ensuring regular servicing and maintenance of the appliance and
chimney system.
HEALTH AND SAFETY PRECAUTIONS
Special care must be taken when installing the boiler such that the requirements of the Health and Safety at
Work Act are met.
Handling
Adequate facilities must be available for loading, unloading and site handling.
Fire Cement
Some types of fire cement are caustic and should not be allowed to come into contact with the skin. In case
of contact wash immediately with plenty of water.
Asbestos
This boiler contains no asbestos. If there is a possibility of disturbing any asbestos in the course of installation
then please seek specialist guidance and use appropriate protective equipment.
Metal Parts
When installing or servicing this boiler care should be taken to avoid the possibility of personal injury.

Version of 27 Oct 2011
Page 2 of 7
BOILER PERFORMANCE
The nominal heat outputs for the various boilers are detailed in the main instruction manual:
PREPARATORY WORK AND SAFETY CHECKS
IMPORTANT WARNING
This boiler must not be installed into a chimney that serves any other heating appliance.
There must not be an extractor fan fitted in the same room as the boiler as this can cause the boiler to emit
fumes into the room.
Chimney
In order for the boiler to perform satisfactorily the chimney height must be sufficient to ensure an adequate
draught of approximately 15 Pa so as to clear the products of combustion and prevent smoke problems into
the room.
NOTE: A chimney height of not less than 4.5 metres measured vertically from the outlet of the boiler to the top
of the chimney should be satisfactory. Alternatively the calculation procedure given in BS EN 13384-1 may be
used as the basis for deciding whether a particular chimney design will provide sufficient draught.
The outlet from the chimney should be above the roof of the building in accordance with the provisions of
Building Regulations Approved Document J.
Because these boilers run at high efficiencies the temperature of the flue gases is lower than conventional
solid fuel appliances. Although they are not classed as condensing appliances, the low flue gas temperature
results in condensation occurring within the flue. Any chimney flue system must therefore be able to withstand
the effects of condensate and operate under wet conditions (designation letter W). In addition it should be
soot fire resistant and able to withstand the corrosive effects of flue products generated by solid fuels
(designation G and 3 respectively). If installation is into an existing masonry chimney then it will require re-
lining with a liner meeting the specification described above. Existing concrete or clay lined chimneys are not
suitable for these boilers and must be lined as described above. All installations must be in accordance with
Building Regulations Approved Document J.
Any existing chimney must be clear of obstruction and have been swept clean immediately before installation
of the lining system.
If there is no existing chimney then any new system must be to the designation described above and in
accordance with Building Regulations Approved Document J.
A single wall metal fluepipe is suitable for connecting the boiler to the chimney but is not suitable for use as
the complete chimney. The chimney and connecting fluepipe must not be less than the size of the outlet
socket of the boiler. The length of this connecting pipe should be kept to a minimum. Refer also to the main
instruction manual for further guidance.
Any bend in the chimney or connecting fluepipe should not exceed 45 . 90 bends should not be used,
except for connecting to a rear outlet appliance, and the connection should be no more than 150 mm in length
and have a debris trap.
Combustible material should not be located where the heat dissipating through the walls of fireplaces or flues
could ignite it. Therefore when installing the boiler in the presence of combustible materials due account must
be taken of the guidance on the separation of combustible material given in Building Regulations Approved
Document J and also in these boiler instructions.
If it is found that there is excessive draught in the chimney then a draught stabiliser should be fitted in the
chimney above the chimney above the flue pipe connection. Fitting of a draught stabiliser will affect the
requirement for the permanent air supply into the room in which the boiler is fitted in accordance with

Version of 27 Oct 2011
Page 3 of 7
Approved Document J (see also combustion air supply).
Adequate provision e.g. easily accessible soot door or doors must be provided for sweeping the chimney and
connecting fluepipe.
Connection to the chimney
All the boilers have a flue gas connector that allows connection to the main chimney using a suitable
connecting pipe. All joints must be sealed in accordance with the recommendations in Approved Document J.
See also “Chimney” above.
Hearth
The hearth should be able to accommodate the weight of the boiler and its chimney if the chimney is not
independently supported. The weight of the boiler is indicated in the instruction manual.
The boiler should always be installed on a non-combustible hearth of a size and construction that is in
accordance with the provisions of the current Building Regulations Approved Document J.
The clearance distances to combustible material beneath, surrounding or upon the hearth and walls adjacent
to the hearth should comply with the guidance on the separation of combustible material given in Building
Regulations Approved Document J and also in these boiler instructions.
Combustion air supply
In order for the boiler to perform efficiently and safely there should be an adequate air supply into the room in
which the boiler is installed to provide combustion air. This is particularly necessary if the room is double-
glazed or a flue draught stabiliser is operating in the same room as the appliance. The provision of air supply
to the boiler must be in accordance with current Building Regulations Approved Document J. An opening
window is not appropriate for this purpose.
Connection to the central heating system
Ensure the heating system is the correct design for the boiler. It is an essential requirement that the system
incorporates a heat storage buffer tank (often referred to as an accumulator). Full guidance is given in the
main installation manual. Depending on the intended design of the heating installation and also on the output
of the boiler, the central heating system must be in accordance, as appropriate, with either BS 6880:1988
Parts 1 to 3, Code of Practice for low temperature hot water heating systems of output greater than 45kW.
Further guidance is available from the following sources: BS EN 14336:2004: Heating Systems in Buildings.
Installation and commissioning of water based heating systems. BS EN 12828: 2003; Heating Systems in
Buildings. Design of water based heating systems. BS EN 12831: 2003; Heating Systems in Buildings.
Method for calculation of the design heat load.
Particular attention must be paid to the installation and correct functioning of any Thermal Safety Device
where necessary. This is described fully in the installation manual.

Version of 27 Oct 2011
Page 4 of 7
Electrical connections
The installation of any electrical services during the installation of this boiler and the associated heating
system must be carried out by a registered competent electrician and in accordance with the requirements of
the latest issue of BS 7671.
Commissioning and handover
Before commissioning this boiler be sure to read and follow the operation manuals to ensure that everything is
carried out in accordance with the correct procedures.
Ensure any loose parts are fitted in accordance with the instructions.
Once the boiler is under fire check all seals for soundness and that the boiler and water system are operating
correctly. Ensure that the flue is functioning correctly and that all products of combustion are vented safely to
atmosphere via the chimney terminal.
On completion of the installation and commissioning ensure that the instruction manuals for the boiler are left
with the customer. Ensure to advise the customer on the correct use of the appliance with the fuels likely to be
used on the boiler and warn them to use only the recommended fuels for the boiler. The user should be given
a demonstration of the required routine maintenance and safety checks. Remind the user of the importance of
regular chimney sweeping and servicing by qualified persons to ensure continued safe operation of the boiler.
Leave the boiler operational and inform the user that this is the case.
Advise the user what to do should smoke or fumes be emitted from the boiler. The customer should be
warned about the dangers to children, aged and/or infirm persons and that access to the boiler should be
protected by a lockable door.

Version of 27 Oct 2011
Page 5 of 7
SUPPLEMENTARY OPERATING INSTRUCTIONS FOR THE UK MARKET
TO BE READ IN CONJUNCTION WITH THOSE IN THE OPERATION MANUAL
READ THE OPERATION MANUAL AND T
TH HE ES SE E I IN NS ST TR RU UC CT TI IO ON NS S
C
CA AR RE EF FU UL LL LY Y B BE EF FO OR RE E U US SI IN NG G T TH HE E B BO OI IL LE ER R
WARNING NOTE
Properly installed, operated and maintained this boiler will not emit fumes into the dwelling. Occasional fumes
from de-ashing and re-fuelling may occur. However, persistent fume emission is potentially dangerous and must
not be tolerated. If fume emission does persist, then the following immediate action should be taken:-
(a) Open doors and windows to ventilate room
(b) Shut the boiler down in accordance with the instructions and vacate the room/building.
(c) Check for flue or chimney blockage and clean if required
(d) Do not attempt to relight the fire until the cause of the fume emission has been identified and corrected. If
necessary seek expert advice.
The most common cause of fume emission is flueway or chimney blockage. For your own safety these must
be kept clean at all times.
IMPORTANT NOTES
General
Before lighting the boiler check with the installer that the installation work and commissioning checks
described in the installation instructions have been carried out correctly and that the chimney has been swept
clean, is sound and free from any obstructions. As part of the boilers’ commissioning and handover the
installer should have shown you how to operate the boiler correctly.
In particularly cold weather the boiler should not be lit if there is a possibility that any part of the heating
system is frozen.
In case of a system fault the boiler is designed to safely shut itself down automatically. If however there is a
need to manually shut the boiler down please follow the instructions given in the operation manual. This
should only be done in emergency situations.
Always ensure the fuel charging door and the ash door are firmly shut after attending to the boiler as
overheating of the boiler may occur if these doors are not fully closed.
CO Alarm
Your installer should have fitted a CO alarm in the same room as the appliance. If the alarm sounds
unexpectedly, follow the instructions given under “Warning Note” above.

Version of 27 Oct 2011
Page 6 of 7
Protection of vulnerable persons
This type of boiler is unlikely to be installed in a part of the home that would be considered as part of the
general living area or easily accessible from such. It is intended to be installed in its own boiler room. This
boiler room should be guarded effectively with the use of an appropriate lockable door.
Chimney cleaning
The chimney should be swept a minimum of twice a year. It is important that the flue connection and chimney
are swept prior to lighting up after a prolonged shutdown period.
In situations where it is not possible to sweep through the boiler the installer will have provided alternative
means, such as a soot door. After sweeping the chimney the boiler flue outlet and the flue pipe connecting
the boiler to the chimney must be cleaned with a flue brush.
Periods of Prolonged Non-Use
If the boiler is to be left unused for a prolonged period of time then it should be given a thorough clean to
remove ash and unburned fuel residues. To enable a good flow of air through the boiler to reduce
condensation and to avoid door seals becoming stuck and subsequently damaged, leave the filling hatch and
combustion chamber doors slightly ajar. These actions will reduce the possibility of unnecessary damage and
corrosion.
It is important to check, and clean if necessary, the connecting pipe and the chimney prior to lighting up the
boiler after a prolonged period of non-use.
Extractor fan
There must not be an extractor fan fitted in the same room as the boiler as this can cause the boiler to emit
smoke and fumes into the room.
Aerosol sprays
Do not use an aerosol spray on or near the boiler when it is alight.
Use of operating tools
Always use the operating tools provided when handling parts likely to be hot when the boiler is in use.
Chimney Fires
If the chimney is thoroughly and regularly swept, chimney fires should not occur. However, if a chimney fire
does occur the control system of the boiler should shut down the system. Please follow the instructions in the
operation manual for emergency manually shutting down the boiler if it appears that the boiler has not shut
down automatically. This should cause the chimney fire to go out in which case the control should be kept at
the minimum setting until the fire in the boiler has gone out. The chimney and flueways should then be
cleaned. If the chimney fire does not go out when the above action is taken then the fire brigade should be
called immediately.
After a chimney fire the chimney should be carefully examined for any damage. Expert advice should be
sought if necessary

Version of 27 Oct 2011
Page 7 of 7
Permanent air vent
The boiler requires a permanent and adequate air supply in order for it to operate safely and efficiently.
In accordance with current Building Regulations the installer may have fitted a permanent air supply vent into
the room in which the boiler is installed to provide combustion air. This air vent should not under any
circumstances be shut off or sealed.
Recommended fuels
The boiler is designed to burn specific wood based fuels as detailed in the main instructions.
HETAS Ltd Approval
This appliance has obtained HETAS Ltd approval for burning the specified fuels. Approval does not cover the
use of other fuels either alone or mixed with the recommended fuels listed, nor does it cover instructions for
the use of other fuels.

Installation Instructions
Pellet Boiler P4 Pellet 8 - 105
Translation of the original German installation instructions for technicians
Read and follow the instructions and safety information!
Technical changes, typographical errors and omissions reserved!
M0931113_en | Edition 25/02/2014
Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com

Table of Contents
1 General 4
2 Safety 5
2.1 Hazard levels of warnings 5
2.2 Qualification of assembly staff 6
2.3 Protective equipment for assembly staff 6
2.4 Design Information 7
2.4.1 Notes on standards 7
General standards for heating systems 7
Standards for structural and safety devices 7
Standards for heating water 7
Standards for permitted fuels 8
2.4.2 Installation and approval of the heating system 8
2.4.3 General information for installation room (boiler room) 8
2.4.4 Requirements for central heating water 9
2.4.5 Notes for using pressure maintenance systems 9
2.4.6 Use with storage tank 10
2.4.7 Chimney connection/chimney system 11
Draught limiter 11
Boiler data for planning the flue gas system 11
2.4.8 Room air-independent operation 12
2.4.9 Boiler ventilation 13
3 Technology 14
3.1 Dimensions 14
3.1.1 Supply air connections for room air-independent operation 15
3.1.2 Flue gas pipe position 15
3.2 Components and connections 16
3.3 Technical specifications 17
3.3.1 P4 Pellet 8/15/20/25 17
3.3.2 P4 Pellet 32/38/45/48/60 18
3.3.3 P4 Pellet 80/100/105 19
3.3.4 Airborne sound level 20
4 Assembly 21
4.1 Materials supplied 21
4.1.1 Tools required 21
4.2 Positioning 21
4.3 Temporary storage 22
4.4 Setting up in the boiler room 23
4.4.1 Remove boiler from pallet 23
4.4.2 Moving the boiler in the boiler room 24
4.4.3 Minimum distances in the boiler room 25
4.5 Dismantling for location where positioning is difficult 26
4.5.1 Removing the stoker assembly and insulation 26
4.5.2 Removing the door and ash drawer (P4 Pellet 8 - 25) 27
4.5.3 Dismantling the suction cyclone cover 28
4.5.4 Dismantling the stoker unit 29
Table of Contents
2 Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com

4.5.5 Positioning dimensions after dismantling 32
4.5.6 Notes for reassembly 33
4.6 Assembling the pellet boiler 34
4.6.1 Before Installation 34
Checking the seal of the ash doors 34
Adjusting the doors 34
4.6.2 Fitting the induced draught fan 37
4.6.3 Fitting the ash container and doors (P4 Pellet 32 - 105) 38
4.7 Connecting the discharge system 39
4.8 Power connection 40
4.8.1 Information on circulating pumps 41
4.8.2 Comfort pellet box port 42
5 Start-up 43
5.1 Before commissioning / configuring the boiler 43
5.1.1 Setting the "Max level and Min level” sensor 44
5.2 Initial startup 44
5.2.1 Permitted fuels 44
Wood pellets 44
5.2.2 Non-permitted fuels 44
5.2.3 Heating up for the first time 45
6 Decommissioning 46
6.1 Mothballing 46
6.2 Disassembly 46
6.3 Disposal 46
7 Appendix 47
7.1 Addresses 47
7.1.1 Address of manufacturer 47
7.1.2 Address of the installer 47
Table of Contents
Installation Instructions P4 Pellet 8 - 105 | M0931113_en 3

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 guide‐
lines.
Please read and observe the documentation provided and always keep it close to the
system for reference. It contains important safety information and all the operation and
maintenance specifications needed to operate the system safely, properly, environ‐
mentally friendly and cost-effectively.
The constant further development of our products means that there may be minor dif‐
ferences 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 cer‐
tificate
1General
4 Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com

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 or damage to property.
Safety 2
Hazard levels of warnings
Installation Instructions P4 Pellet 8 - 105 | M0931113_en 5

2.2 Qualification of assembly staff
CAUTION
Assembly and installation by untrained personnel:
Risk of personal injury and damage to property.
During assembly and installation:
❒ Observe the instructions and information in the manuals
❒ Only allow trained staff to carry out assembly and installation
Assembly, installation, initial startup and servicing must always be carried out by quali‐
fied personnel:
- Heating technician / building technician
- Electrical installation technician
- Froling customer services
The assembly staff must have read and understood the instructions in the documenta‐
tion.
2.3 Protective equipment for assembly staff
You must ensure that staff have the protective equipment specified by accident pre‐
vention regulations.
▪ For transportation, setup and assembly:
- suitable workwear
- protective gloves
- sturdy shoes
2Safety
Qualification of assembly staff
6 Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com

2.4 Design Information
2.4.1 Notes on standards
The system must be installed and commissioned in accordance with the local fire and
building regulations. The following standards and regulations should always be ob‐
served:
General standards for heating systems
EN 303-5 Boilers for solid fuels, manually and automatically fed combus‐
tion 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 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
Standards for structural and safety devices
ÖNORM H 5170 Heating installation - Requirements for construction and safety
engineering, as well as fire prevention and environmental pro‐
tection
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)
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 Sheet 1 Prevention of damage in water heating systems - Scale forma‐
tion in domestic water heating systems and hot water heating
systems (Germany)
SWKI 97-1 Water quality for heating, steam, cooling and air conditioning
systems (Switzerland)
D.P.R. no. 412 Regulations for the planning, installation, running/operation and
maintenance of heating systems in buildings to reduce energy
consumption with reference to Article 4, Comma 4 of the Legis‐
lative Decree of 9 January 1991, No. 10 (Italy)
Safety 2
Design Information
Installation Instructions P4 Pellet 8 - 105 | M0931113_en 7

Standards for permitted fuels
EN 14961-2 Solid biofuel, fuel specifications and classes.
Part 2: Wood pellets for non-industrial use
1. BImSchV First Ordinance of the German Federal Government for imple‐
mentation of the Federal Emission Protection Law, BGBl. I P.
491, in the applicable version.
2.4.2 Installation and approval of the heating system
The boiler should be operated in a closed heating system. The following standards
govern the installation:
ÖNORM / DIN 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: Inform the civic/municipal building authorities.
Germany: Notify an approved chimney sweep and the building authorities.
2.4.3 General information for installation room (boiler room)
Boiler room characteristics
▪ 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 provide sufficient light‐
ing in the boiler room in accordance with national workplace design regulations.
▪ When using the boiler over 2000 metres above sea level you should consult the
manufacturer.
▪ Danger of fire due to flammable materials.
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 in the room where
the boiler is installed.
▪ Keep the air suction opening of the boiler free from dust.
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 (foli‐
age, snowdrifts, etc.) from obstructing the air flow.
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:
Note on standards
2Safety
Design Information
8 Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com

ÖNORM H 5170 - Construction and fire protection requirements
TRVB H118 - Technical directives on fire protection/prevention
2.4.4 Requirements for central heating water
The following standards and guidelines apply:
Austria:
Germany:
Switzerland:
Italy:
ÖNORM H 5195-1
VDI 2035
SWKI 97-1
D.P.R. no. 412
NOTICE! Note on filling with make-up water: always bleed the filling hose before con‐
necting, in order to prevent air from entering the system.
Observe the standards and also follow the recommendations below:
❒Max. cumulative value for alkaline earth: 1.0 mmol/l or 100 mg/l (corresponds to
5.6 dH)
❒ Use softened water as the make-up water
❒ Avoid leaks and use a closed heating system to maintain water quality during op‐
eration
2.4.5 Notes for using pressure maintenance systems
Pressure maintenance systems in hot-water heating systems keep the required pres‐
sure 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 ex‐
pansion 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 in‐
to the heating water.
Pump-controlled pressure maintenance
A pump-controlled pressure maintenance unit essentially consists of a pressure-main‐
tenance 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 expan‐
sion 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.
Note on standards
Note on standards
Safety 2
Design Information
Installation Instructions P4 Pellet 8 - 105 | M0931113_en 9

2.4.6 Use with storage tank
NOTICE
In principle it is not necessary to use a storage tank for the system to run smooth‐
ly. 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 47]
2Safety
Design Information
10 Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com

2.4.7 Chimney connection/chimney system
EN 303-5 specifies that the entire flue gas system must be designed to prevent, wher‐
ever possible, damage caused by seepage, insufficient feed pressure and condensa‐
tion. 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 cal‐
culated 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!
Draught limiter
The installation of a draught limiter is recommended.
NOTICE! Install the draught limiter directly under the mouth of the flue line, as the
pressure is constantly low at this point.
Boiler data for planning the flue gas system
Description P4 Pellet
8 15 20 25 32 38
Flue gas temperature at nominal
load
°C 140 150 150 150 160 160
Flue gas mass flow at nominal
load
kg/s 0.007 0.010 0.014 0.018 0.022 0.025
Flue gas mass flow at partial load 0.003 0.004 0.006 0.007 0.009 0.011
Required feed pressure at nominal
load
mbar 0.08 0.08 0.08 0.08 0.08 0.08
Required feed pressure at partial
load
0.06 0.06 0.06 0.06 0.06 0.06
Maximum permissible feed pres‐
sure
as per ÖNORM / DIN EN 303-5
Flue spigot diameter mm 130 130 130 130 150 150
Safety 2
Design Information
Installation Instructions P4 Pellet 8 - 105 | M0931113_en 11

Description P4 Pellet
45 / 48 60 80 100 105
Flue gas temperature at nominal load °C 160 170 160 170 170
Flue gas mass flow at nominal load kg/s 0.039 0.043 0.060 0.076 0.079
Flue gas mass flow at partial load 0.017 0.019 0.021 0.026 0.028
Required feed pressure at nominal
load
mbar 0.08 0.08 0.08 0.08 0.08
Required feed pressure at partial load 0.06 0.06 0.06 0.06 0.06
Maximum permissible feed pressure as per ÖNORM / DIN EN 303-5
Flue spigot diameter mm 150 150 200 200 200
2.4.8 Room air-independent operation
The P4 Pellet has a central air connection on the back of the boiler. If appropriate sup‐
ply air and flue gas connections are installed, the boiler can be operated independent‐
ly of room air as a type C42 or type C82 in the sense of EN 15035.
Definition of type C8 as per EN 15035
A boiler that is connected via its combustion air supply and flue gas outlet, with a con‐
necting 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!
Definition of type C8 as per EN 15035
A boiler that is connected via its combustion air supply and flue gas outlet, with a con‐
necting 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 sys‐
tem!
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.
2Safety
Design Information
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