Fröling PE1e User manual

Installation instructions
Pellet condensing boiler PE1e Pellet (ESP)
Translation of original German version of installation instructions for technicians.
Read and follow all instructions and safety instructions.
All errors and omissions excepted.
M2440122_en | Edition 07/09/2022

Table of contents
ii M2440122_en | Installation instructions Pellet condensing boiler PE1e Pellet (ESP)
1 General ......................................................................................................................................................... 4
1.1 About this manual ................................................................................................................................. 4
1.2 What do we mean by condensing boiler technology............................................................................. 4
2 Safety............................................................................................................................................................ 5
2.1 Hazard levels of warnings ..................................................................................................................... 5
2.2 Qualification of assembly staff .............................................................................................................. 6
2.3 Personal protective equipment for assembly staff ................................................................................ 6
3 Design Information...................................................................................................................................... 7
3.1 Overview of standards .......................................................................................................................... 7
3.1.1 General standards for heating systems ..................................................................................... 7
3.1.2 Standards for structural and safety devices............................................................................... 7
3.1.3 Standards for heating water....................................................................................................... 7
3.1.4 Regulations and standards for permitted fuels .......................................................................... 8
3.2 Installation and approval ....................................................................................................................... 8
3.2.1 Obligation to report as a condensing boiler system ................................................................... 8
3.3 Installation site ...................................................................................................................................... 8
3.4 Chimney connection/chimney system................................................................................................... 9
3.4.1 Connection line to the chimney.................................................................................................. 10
3.4.2 Measuring port ........................................................................................................................... 11
3.4.3 Draught limiter............................................................................................................................ 11
3.4.4 Explosion flap............................................................................................................................. 11
3.5 Combustion air for room air-dependent operation ................................................................................ 12
3.5.1 Combustion air supply at the installation room .......................................................................... 12
3.5.2 Simultaneous operation with other air-drawing systems............................................................ 13
3.6 Combustion air for room air-independent operation (RUL) ................................................................... 14
3.6.1 Definition of terms ...................................................................................................................... 14
3.6.2 Supply air line ............................................................................................................................ 15
3.6.3 Condensation............................................................................................................................. 15
3.7 Domestic hot water ............................................................................................................................... 16
3.8 Pressure maintenance systems ............................................................................................................ 17
3.9 Storage tank.......................................................................................................................................... 18
3.10 Return temperature control ................................................................................................................... 18
3.11 Wash-down water ................................................................................................................................. 18
3.12 Condensate drainage............................................................................................................................ 19
3.13 Boiler ventilation.................................................................................................................................... 19
4 Technology .................................................................................................................................................. 20
4.1 Dimensions ........................................................................................................................................... 20
4.2 Components and connections............................................................................................................... 21
4.3 Technical data....................................................................................................................................... 22
4.3.1 PE1e Pellet condensing boiler ................................................................................................... 22
4.3.2 PE1e Pellet condensing boiler ESP........................................................................................... 23
4.3.3 Boiler data for planning the flue gas system .............................................................................. 26
4.3.4 Data for planning a backup power supply.................................................................................. 26
4.4 External suction module........................................................................................................................ 27
5 Transport and storage ................................................................................................................................ 28
5.1 Delivery configuration............................................................................................................................ 28
5.2 Temporary storage................................................................................................................................ 28
5.3 Positioning............................................................................................................................................. 29
5.4 Positioning at the installation site .......................................................................................................... 30

Table of contents
M2440122_en | Installation instructions Pellet condensing boiler PE1e Pellet (ESP) iii
5.4.1 Remove boiler from pallet .......................................................................................................... 30
5.4.2 Operating and maintenance areas of the equipment................................................................. 32
6 Assembly ..................................................................................................................................................... 33
6.1 Tools required ....................................................................................................................................... 33
6.2 Assembly overview ............................................................................................................................... 33
6.3 Accessories supplied ............................................................................................................................ 34
6.4 Installing the boiler ................................................................................................................................ 34
6.4.1 Levelling the boiler ..................................................................................................................... 34
6.4.2 Install balancing valve (optional)................................................................................................ 35
6.4.3 Control the return temperature control....................................................................................... 35
6.5 Installing the discharge system ............................................................................................................. 37
6.5.1 Installing the external suction module........................................................................................ 37
6.5.2 Connect the suction hoses to the boiler..................................................................................... 39
6.5.3 Assembly information for hose lines .......................................................................................... 40
6.6 Installing the condensation drain........................................................................................................... 42
6.7 Connect the connection line to the chimney ......................................................................................... 43
6.8 Hydraulic connection............................................................................................................................. 44
6.8.1 Connect the water supply to the boiler....................................................................................... 44
6.9 Electrical connection ............................................................................................................................. 45
6.9.1 Board overview .......................................................................................................................... 46
6.9.2 Mains connection ....................................................................................................................... 46
6.9.3 External suction module............................................................................................................. 47
6.9.4 Potential equalisation................................................................................................................. 47
6.10 Set condensing boiler heat exchanger in the software ......................................................................... 48
6.10.1 Condenser ................................................................................................................................. 48
6.11 Final installation steps........................................................................................................................... 49
6.11.1 Install the brackets for accessories............................................................................................ 49
6.11.2 Insulate the connection line ....................................................................................................... 50
6.11.3 Stick on an additional identification plate (on PE1e Pellet ESP)................................................ 50
7 Start-up......................................................................................................................................................... 51
7.1 Before commissioning / configuring the boiler ...................................................................................... 51
7.2 Initial startup.......................................................................................................................................... 52
7.2.1 Permitted fuels ........................................................................................................................... 52
7.2.2 Non-permitted fuels.................................................................................................................... 52
7.2.3 Heating up for the first time........................................................................................................ 52
8 Decommissioning ....................................................................................................................................... 53
8.1 Mothballing............................................................................................................................................ 53
8.2 Disassembly.......................................................................................................................................... 53
8.3 Disposal ................................................................................................................................................ 53
9 Appendix ...................................................................................................................................................... 54
9.1 Dismantling for location where positioning is difficult ............................................................................ 54
9.1.1 Tools required ............................................................................................................................ 54
9.1.2 Overview of disassembly steps.................................................................................................. 55
9.1.3 Dismantling the cardboard box and pallet.................................................................................. 57
9.1.4 Dismantling the cladding and controller box .............................................................................. 58
9.1.5 Removing the pellet container and stoker.................................................................................. 67
9.1.6 Removing the condensing boiler heat exchanger...................................................................... 68
9.1.7 Removing the ash removal screws and front boiler floor ........................................................... 69
9.1.8 Removing the boiler floor ........................................................................................................... 71
9.1.9 Disassembly of the WOS system in order to reduce weight (optional) ...................................... 72
9.1.10 Disassembly of the firebricks in order to reduce weight (optional)............................................. 74

1 | General
4 M2440122_en | Installation instructions Pellet condensing boiler PE1e Pellet (ESP)
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.
Issuing a delivery
certificate 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.
1.1 About this manual
These installation instructions contain information for the following boiler sizes of the
PE1e Pellet condensing boiler:
45, 50, 55, 60;
1.2 What do we mean by condensing boiler technology
Each type of fuel has a certain water content. During combustion, the moisture released
(as steam) would normally dissipate with the flue gases through the chimney. If the flue
gas temperature is very low, the moisture condenses. Die condensing boiler technology
uses the heat of condensation of the moisture to capture additional heat.

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M2440122_en | Installation instructions Pellet condensing boiler PE1e Pellet (ESP) 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.

2 | Safety
6 M2440122_en | Installation instructions Pellet condensing boiler PE1e Pellet (ESP)
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:
rObserve the instructions and information in the manuals
rOnly 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!
▪ During transport, erection and installation:
- wear suitable work wear
- wear protective gloves
- wear safety shoes (min. protection class S1P)

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M2440122_en | Installation instructions Pellet condensing boiler PE1e Pellet (ESP) 7
3 Design Information
3.1 Overview of standards
Perform installation and commissioning of the system 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)
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 | Design Information
8 M2440122_en | Installation instructions Pellet condensing boiler PE1e Pellet (ESP)
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
3.2 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.
3.2.1 Obligation to report as a condensing boiler system
A condensing boiler system with condensate discharge must be reported to the
responsible regional authorities (for instance the water and sewage board in Austria).
3.3 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

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3.4 Chimney connection/chimney system
1
2
3
4
1Connection line to the chimney
2Measuring port
3Explosion flap (for automatic boilers)
4Thermal insulation
NOTICE!The chimney must be authorised by a smoke trap sweeper or chimney
sweep.
The entire flue gas system (chimney and connection) must be laid out as per ÖNORM /
DIN EN 13384-1 or ÖNORM M 7515 / DIN 4705-1.
The flue gas temperatures (for clean systems) and additional flue gas values can be
found in the table in the technical data.
Local regulations and other statutory regulations are also applicable.
▪ Wood fuel may only be used with soot-fire-resistant chimney systems. Plastic pipes
are not permitted.
▪ Due to the low flue gas temperatures, only moisture resistant chimneys with suitable
condensation drainage can be used with condensing boiler technology.

3 | Design Information
10 M2440122_en | Installation instructions Pellet condensing boiler PE1e Pellet (ESP)
3.4.1 Connection line to the chimney
Requirements for the connection line:
▪ this should be as short as possible and follow an upward incline to the chimney (30 -
45° recommended)
▪ thermally insulated
▪ leak-tight against overpressure
MFeuV1) (Germany) EN 15287-1 and EN 15287-2
400
100
[mm]
D
20
23
3 x D
[mm]
D
(min. 375)
1,5 x D
(min. 200)
2
4
1. Observe the fire regulations of the respective federal state
2. Component made of flammable material
3. Nonflammable insulating material
4. Radiation shield with rear ventilation
Minimum distance from flammable substances as per MFeuV1) (Germany):
▪ 400 mm excluding thermal insulation
▪ 100 mm if at least 20 mm thermal insulation is installed
Minimum distance from flammable materials as per EN 15287-1 and EN 15287-2:
▪ 3 x nominal diameter of connection line, but at least 375 mm (NM)
▪ 1.5 x nominal diameter of connection line for radiation shield with rear ventilation, but
at least 200 mm (NM)
NOTICE!The minimum distances must be observed in accordance with the
standards and guidelines applicable in the region
Any backflow of condensation in the condensing boiler heat exchanger does not pose a
problem as it will be drained through the siphon. A condensation trap is therefore not
required.
We generally recommend using the Froling FAR connection pipe. This connection pipe is
pressure-tight and, therefore, perfect for the boiler system. Together with the boiler
system, the FAR connection pipe is designed in accordance with machine guidelines and
is the optimal connection to the boiler.

Design Information | 3
M2440122_en | Installation instructions Pellet condensing boiler PE1e Pellet (ESP) 11
3.4.2 Measuring port
2 x D
D
D
M
Upstream of the measuring port (M) there should be a straight run-in section with a length
about twice the diameter (D) of the connection line. Downstream of the measuring port
(M) there should be a straight run-out section with a length about the diameter (D) of the
connection line. 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.
Recommendation: When using the Froling FAR connection pipe, a flue pipe element
with integrated measuring port can be used.
3.4.3 Draught limiter
As the connection line to the chimney must be pressure-tight on systems with condensing
boiler technology, it is not permitted to install a draught limiter in the connection line.
Likewise, if the entire chimney unit is designed with overpressure, a draught limiter must
not be fitted.
Exception: If the chimney is calculated or operated with underpressure, it is
recommended that a draught limiter be fitted in the chimney below the connection line.
3.4.4 Explosion flap
TRVB H 118 (only Austria) stipulates that an explosion flap must be installed in the
connection line to the chimney, directly next to the boiler. It should be situated in such a
way that is poses no risk to persons!

3 | Design Information
12 M2440122_en | Installation instructions Pellet condensing boiler PE1e Pellet (ESP)
3.5 Combustion air for room air-dependent operation
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
3.5.1 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
TRVB H118 - Technical directives on fire protection/prevention

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M2440122_en | Installation instructions Pellet condensing boiler PE1e Pellet (ESP) 13
3.5.2 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:
DiBt requires that an approved under-pressure monitoring system (such as air pressure
monitor P4) which monitor the maximum under-pressure to 4 Pa must be installed in the
installation room.
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.

3 | Design Information
14 M2440122_en | Installation instructions Pellet condensing boiler PE1e Pellet (ESP)
3.6 Combustion air for room air-independent operation (RUL)
12
3
1Boiler
2Air extraction system (such as centralised dust extraction system, room ventilation)
3Combustion air supply from outside (irrespective of ambient air)
3.6.1 Definition of terms
There is 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
Type C4Boiler 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 C8A 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
Type FC42x 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.
Type FC52x 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.

Design Information | 3
M2440122_en | Installation instructions Pellet condensing boiler PE1e Pellet (ESP) 15
3.6.2 Supply air line
NOTICE!Install the combustion air supply (piping) in accordance with the
applicable standards
Ü "Overview of standards" [}7]
rConnect the supply air line leak-tight to the connection on the boiler
ÄRefer to the dimensions of the supply air line connection on the boiler in the
Technical Data
When dimensioning pipe bends in the supply air line, ensure that:
The ratio of the radius of curvature (r) to pipe diameter (d) is greater than 1
r:d ≥ 1
For example:
- supply air line diameter = 160 mm
- minimum radius of pipe bends = 160 mm
▪ The supply air line should be as straight as possible and take the shortest path
▪ Keep the number of pipe bends to a minimum
▪ Max. resistance of the supply air line: 20 Pa
3.6.3 Condensation
NOTICE!The greater the difference between the temperature of the outside air
being drawn in and the 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:
rJacket the entire supply air line with suitable thermal insulation

3 | Design Information
16 M2440122_en | Installation instructions Pellet condensing boiler PE1e Pellet (ESP)
3.7 Domestic hot 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:
rAim 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 8.2 and 9.0
rUse prepared water which complies with the standards cited above for filling and
make-up water
rAvoid leaks and use a closed heating system to maintain water quality during
operation
rWhen filling with make-up water, always bleed the filling hose before connecting, in
order to prevent air from entering the system
rThe heating water must be clear and free from substances that lead to sediments.
rWith regard to corrosion protection, the use of fully demineralised filling and make-up
water with an electrical conductivity of up to 100 µS/cm is recommended in
accordance with EN 14868
Advantages of low-salt or fully demineralised 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
Filling and make-up water as well as heating water in accordance with VDI 2035:
Total heat output in kW Total earth alkalis in mol/m³ (total hardness in °dH)
Specific system volume in l/kW heat output1)
≤ 20 20 to ≤40 > 40
≤ 50
specific water content
heat generator ≥ 0.3 l/kW2)
none ≤ 3.0 (16.8) < 0.05 (0.3)
≤ 50
specific water content
heat generator < 0.3 l/kW2)
(e.g. circulation water heater) and
systems with electric heating
elements
≤ 3.0 (16.8) ≤ 1.5 (8.4)
> 50 to ≤ 200 ≤ 2.0 (11.2) ≤ 1.0 (5.6)
> 200 to ≤ 600 ≤ 1.5 (8.4) < 0.05 (0.3)
> 600 < 0.05 (0.3)
1. For calculating the specific system volume, the smallest individual heating capacity is to be used for systems with several heat generators.
2. In systems with several heat generators with different specific water contents, the smallest specific water content is decisive in each case.

Design Information | 3
M2440122_en | Installation instructions Pellet condensing boiler PE1e Pellet (ESP) 17
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
3.8 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 | Design Information
18 M2440122_en | Installation instructions Pellet condensing boiler PE1e Pellet (ESP)
3.9 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 Fröling.
Additional requirements for Switzerland in accordance with LRV Appendix 3, section 523
Automatic boilers for wood pellets with a rated thermal output of more than 70 kW must
be equipped with a heat accumulator of a volume of at least 25 litres per kW rated
thermal output. These dimensioning specifications apply up to 500 kW nominal heat
output.
3.10 Return temperature control
If the hot water return is below the minimum return temperature, some of the hot water
outfeed will be mixed in. This is done by the return temperature control, which is
integrated in the hydraulics on the side panel of the boiler.
3.11 Wash-down water
Normal drinking water or rainwater can be used for flushing the condensing boiler heat
exchanger; the use of grey water is not permitted.
NOTE: When making connections to the public water supply, comply with the local
regulations.
The condensing boiler heat exchanger is flushed every 10-20 heating hours and requires
about 22-35 litres of flushing water for each flushing operation.
The temperature of the flushing water at the heat exchanger outlet is a maximum of 40
°C.
The following specifications must be observed for the flushing water connection:
▪ At least Water pressure: 3 bar
▪ Max. water pressure: 6 bar
▪ Maximum water temperature: 25°C

Design Information | 3
M2440122_en | Installation instructions Pellet condensing boiler PE1e Pellet (ESP) 19
3.12 Condensate drainage
The condensate must be continuously drained into the waste water system in accordance
with local regulations for heating systems with condensing boiler technology.
In respect of the condensate drainage, ensure:
▪ Line of raw material resistant to condensate
▪ Diameter at least 50 mm
▪ Lengths of line as short as possible
▪ Fall gradient at least 3°
▪ Frost-free
▪ Easily accessible for disassembly and cleaning
▪ Inspection at regular intervals
NOTICE!The condensate connection may not be changed or closed.
NOTICE!If the pipework to the drain cannot be installed in a correct fashion, the
use of waste water pumping system is recommended. Suitable systems are
available on request from Fröling GesmbH.
3.13 Boiler ventilation
rFit the automatic ventilating valve at the highest point on the boiler or at the ventilation
connection (if present).
ÄThis ensures that air in the boiler is constantly expelled, thus preventing
malfunctions caused by air in the boiler
rCheck that the boiler ventilation is working properly
ÄAfter installation and periodically according to manufacturer’s instructions
Tip: rFit a vertical pipe as a calming section in front of the automatic ventilating valve in
such a way that the ventilating valve is positioned above the water level in the boiler
Recommendation: rFit a microbubble separator in the pipes to the boiler
ÄFollow the manufacturer's instructions!

4 | Technology
20 M2440122_en | Installation instructions Pellet condensing boiler PE1e Pellet (ESP)
4 Technology
4.1 Dimensions
B5
L1
L2
H5
H6
B6
B3
B2
B1
B4
B7
B8
H4
H2 H1
H3
Item Description Unit 45-60
L1 Boiler length mm 1690
L2 Total length 1780
B1 Distance between flow connection and side of boiler 590
B2 Distance between fresh water connection and side of boiler 395
B3 Distance between flue gas pipe connection and side of boiler 205
B4 Distance between return connection and side of boiler 510
B5 Distance between condensation drain connection and side of
boiler
270
B6 Distance of supply air connection to side of boiler (optional) 560
B7 Boiler width 730
B8 Boiler width incl. cover for electrostatic particle separator
(optional)
810
H1 Height of flow connection / fresh water 1425
H2 Height, return connection 645
H3 Height of supply air connection (optional) 100
H4 Height, condensation drain connection 330
H5 Height, flue pipe connection 1025
H6 Boiler height 1620