Fröling PE1c Pellet 16-22 User manual

Operating instructions
Pellet condensing boiler PE1c Pellet (ESP)
Translation of original German version of operating instructions for operators.
Read and follow all instructions and safety instructions.
All errors and omissions excepted.
B1590522_en | Edition 19/05/2022

Table of contents
ii B1590522_en | Operating instructions Pellet condensing boiler PE1c Pellet (ESP)
1 General ......................................................................................................................................................... 4
1.1 Product overview PE1c Pellet ............................................................................................................... 5
2 Safety............................................................................................................................................................ 6
2.1 Hazard levels of warnings ..................................................................................................................... 6
2.2 Pictograms used ................................................................................................................................... 7
2.3 General safety information .................................................................................................................... 8
2.4 Permitted uses ...................................................................................................................................... 9
2.4.1 Permitted fuels ........................................................................................................................... 9
2.4.2 Non-permitted fuels.................................................................................................................... 10
2.5 Qualification of operating staff............................................................................................................... 10
2.6 Protective equipment for operating staff ............................................................................................... 10
2.7 Safety Devices ...................................................................................................................................... 11
2.8 Residual risks........................................................................................................................................ 12
2.9 Emergency procedure........................................................................................................................... 14
2.9.1 Overheating of the system ......................................................................................................... 14
2.9.2 Smell of flue gas ........................................................................................................................ 14
2.9.3 Fire in the system....................................................................................................................... 14
3 Notes for operating a heating system ....................................................................................................... 15
3.1 Installation and approval ....................................................................................................................... 15
3.1.1 Obligation to report as a condensing boiler system ................................................................... 15
3.2 Installation site ...................................................................................................................................... 15
3.3 Combustion air for room air-dependent operation ................................................................................ 16
3.3.1 Combustion air supply at the installation room .......................................................................... 16
3.3.2 Simultaneous operation with other air-drawing systems............................................................ 17
3.4 Combustion air for room air-independent operation.............................................................................. 18
3.4.1 Definition of terms ...................................................................................................................... 18
3.4.2 Supply air line ............................................................................................................................ 19
3.4.3 Condensation............................................................................................................................. 19
3.5 Domestic hot water ............................................................................................................................... 20
3.6 Pressure maintenance systems ............................................................................................................ 22
3.7 Storage tank.......................................................................................................................................... 22
3.8 Chimney connection/chimney system................................................................................................... 22
3.9 Condensate drainage............................................................................................................................ 23
4 Operating the system.................................................................................................................................. 24
4.1 Assembly and initial startup .................................................................................................................. 24
4.2 Switching on the power supply.............................................................................................................. 25
4.3 Operate the boiler using the touch display............................................................................................ 25
4.3.1 Overview of the touch display .................................................................................................... 25
4.3.2 Select information displays ........................................................................................................ 31
4.3.3 Switch boiler ON/OFF ................................................................................................................ 33
4.3.4 Change boiler mode................................................................................................................... 33
4.3.5 Change date and time................................................................................................................ 34
4.3.6 Change desired DHW tank temperature.................................................................................... 34
4.3.7 One-time extra loading of an individual DHW tank .................................................................... 35
4.3.8 One-time extra loading of all existing DHW tanks...................................................................... 35
4.3.9 Set the heating curve of a heating circuit................................................................................... 36
4.3.10 Change room temperature (heating circuit without room temperature sensor) ......................... 37
4.3.11 Change room temperature (heating circuit with room temperature sensor) .............................. 38
4.3.12 Switch heating circuit mode ....................................................................................................... 38
4.3.13 Lock display/switch user level.................................................................................................... 39
4.3.14 Change the name of the components........................................................................................ 39

Table of contents
B1590522_en | Operating instructions Pellet condensing boiler PE1c Pellet (ESP) iii
4.3.15 Configure the holiday program................................................................................................... 40
4.4 Switch the boiler ON/OFF on the room console.................................................................................... 41
4.5 Adjust pellet consumption counter after fuel delivery............................................................................ 42
4.5.1 Notes on filling the fuel stores.................................................................................................... 42
4.5.2 Correct the remaining pellet amount in store room.................................................................... 43
4.5.3 Adjust the pellet consumption counter to the fuel ...................................................................... 43
4.5.4 Setting the automatic notification for minimum level.................................................................. 45
4.5.5 Resetting the pellet consumption counter.................................................................................. 46
4.6 Check the fill level of the ash container and empty if required.............................................................. 46
4.6.1 Check the fill level of the ash container ..................................................................................... 46
4.6.2 Empty ash container .................................................................................................................. 47
4.7 Switching off the power supply.............................................................................................................. 48
5 Servicing the system .................................................................................................................................. 49
5.1 General information on servicing .......................................................................................................... 49
5.2 Required tools ....................................................................................................................................... 50
5.3 Maintenance work by the operator........................................................................................................ 51
5.3.1 Inspection................................................................................................................................... 51
5.3.2 Periodic inspection and cleaning ............................................................................................... 52
5.4 Maintenance work by technicians ......................................................................................................... 62
5.4.1 Checking and cleaning the combustion grate ............................................................................ 63
5.4.2 Cleaning the measurement line of the underpressure controller ............................................... 63
5.4.3 Cleaning the Lambda probe....................................................................................................... 64
5.5 Emissions measurement by chimney sweep or regulatory body .......................................................... 65
5.5.1 Switch on the system ................................................................................................................. 65
5.5.2 Start emissions measurement ................................................................................................... 66
5.6 Replacement parts ................................................................................................................................ 66
5.7 Disposal information.............................................................................................................................. 66
5.7.1 Disposal of the ash .................................................................................................................... 66
5.7.2 Disposal of system components ................................................................................................ 66
6 Troubleshooting .......................................................................................................................................... 67
6.1 General fault with power supply ............................................................................................................ 67
6.1.1 Behaviour of system after a power failure.................................................................................. 67
6.2 Excessive temperature.......................................................................................................................... 67
6.3 Faults with fault message...................................................................................................................... 68
6.3.1 Procedure for fault messages .................................................................................................... 68

1 | General
4 B1590522_en | Operating instructions Pellet condensing boiler PE1c 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.
Warranty and Guarantee Conditions
Our sale and delivery conditions will be applicable. These conditions have been made
available to customers, and customers have been made aware of them at the time of
order completion.
You can also find the guarantee conditions on the enclosed guarantee certificate.

General | 1
B1590522_en | Operating instructions Pellet condensing boiler PE1c Pellet (ESP) 5
1.1 Product overview PE1c Pellet
3
13 14
11
16
15
12
4
7
68
12
9
10
5
1Main switch 9Lambda probe
2High-limit thermostat STL 10 Under-pressure controller
3Lambdatronic P 3200 control 11 Combustion chamber
4WOS Efficiency Optimisation System 12 Induced draught unit fan
5Flue gas temperature sensor 13 Ashcan 18
61) Wash nozzle of flushing device 14 Combustion grate
17Electrostatic particle separator 15 Drain pan
8Flushing device 16 Condensation drain
1. depending on model

2 | Safety
6 B1590522_en | Operating instructions Pellet condensing boiler PE1c Pellet (ESP)
2 Safety
2.1 Hazard levels of warnings
This documentation uses warnings with the following hazard levels to indicate direct
hazards and important safety instructions:
DANGER
The dangerous situation is imminent and if measures are not observed it will lead
to serious injury or death. You must follow the instructions!
WARNING
The dangerous situation may occur and if measures are not observed it will lead to
serious injury or death. Work with extreme care.
CAUTION
The dangerous situation may occur and if measures are not observed it will lead to
minor injuries.
NOTICE
The dangerous situation may occur and if measures are not observed it will lead to
damage to property or pollution.

Safety | 2
B1590522_en | Operating instructions Pellet condensing boiler PE1c Pellet (ESP) 7
2.2 Pictograms used
The following symbols are used in the documentation and/or on the boiler to show what is
required and forbidden and to give warnings.
In accordance with the Machinery Directive, signs fitted directly within the danger area of
the boiler indicate immediate hazards or safety procedures. These stickers must not be
removed or covered.
Refer to the operating instructions Wear safety shoes
Wear protective gloves Turn off the main switch
Keep the doors closed Wear a dust mask
Work under the supervision of a
second person
Lock
Unauthorised access prohibited No fire, open flames or smoking
Warning - hot surface Warning - hazardous electrical
voltage
Warning - hazardous or irritant
materials
Warning - automatic boiler startup
Warning of injury to fingers or
hands, automatic fan
Warning of injury to fingers or
hands, automatic screw
Warning of injury to fingers or
hands, gear/chain drive
Warning of injury to fingers or
hands, cutting edge
Hand injury warning Warning of injury from being pulled
into rotating shafts
Increased CO concentration
warning
Slipping hazard warning

2 | Safety
8 B1590522_en | Operating instructions Pellet condensing boiler PE1c Pellet (ESP)
2.3 General safety information
DANGER
If the device is used incorrectly:
Incorrect use of the system can cause severe injury and damage.
When operating the system:
rObserve the instructions and information in the manuals
rObserve the details on procedures for operation, maintenance and cleaning, as well
as troubleshooting in the respective manuals.
rAny work above and beyond this (e.g. servicing) must be carried out by a heating
engineer approved by Fröling Heizkessel- und Behälterbau GesmbH or by Froling
customer services
WARNING
External influences:
Negative external influences, such as insufficient combustion air or non-standard
fuel, can cause serious faults in combustion (e.g. spontaneous combustion of
carbonisation gases or flash fires) which can in turn cause serious accidents!
When operating the boiler, please note the following:
rInstructions and information regarding versions and minimum values, as well as
standards and guidelines for heating components in the instructions must be
observed.
WARNING
Severe injuries and damage can be caused by an inadequate flue gas system.
Problems with the flue gas system, such as poor cleaning of the flue pipe or
insufficient chimney draught, can cause serious faults in combustion (such as
spontaneous combustion of carbonisation gases or flash fires).
Take the following precautions:
rOptimum boiler performance can only be guaranteed if the flue gas system is
functioning correctly.

Safety | 2
B1590522_en | Operating instructions Pellet condensing boiler PE1c Pellet (ESP) 9
2.4 Permitted uses
The Froling Pellet boiler PE1c Pellet is designed solely for heating domestic water. Only
the fuels specified in the "Permitted fuels" section may be used.
Ü "Permitted fuels" [}9]
The unit should only be operated when it is in full working order. It must be operated in
accordance with the instructions, observing safety precautions, and you should ensure
you are aware of the potential hazards. The inspection and cleaning intervals in the
operating instructions must be observed. Ensure that any faults which might impair safety
are rectified immediately.
The manufacturer or supplier is not liable for any damage resulting from non-permitted
uses.
Only original spare parts or specific alternative spare parts authorised by the
manufacturer may be used. Any kind of change or modification made to the product will
invalidate the manufacturer’s conformity with the applicable guideline(s). In such cases,
the product will need to undergo new hazard evaluation procedures by the operator. The
operator will then be fully responsible for the declaration of conformity according to the
valid guideline(s) for the product and will need to issue a corresponding declaration for
the device. This person will then assume all of the rights and responsibilities of a
manufacturer.
2.4.1 Permitted fuels
Wood pellets
Wood pellets made from natural wood with a diameter of 6mm
Note on standards EU: Fuel acc. to EN ISO 17225 - Part 2: Wood pellets class A1 / D06
and/or: ENplus / DINplus certification scheme
General note:
Before refilling the store, check for pellet dust and clean if necessary.
TIP: Fit the Froling PST pellet deduster for separating the dust particles contained in the
return air

2 | Safety
10 B1590522_en | Operating instructions Pellet condensing boiler PE1c Pellet (ESP)
2.4.2 Non-permitted fuels
The use of fuels other than those defined in the "Permitted fuels" section, and particularly
the burning of refuse, is not permitted
NOTICE
In case of use of non-permitted fuels:
Burning non-permitted fuels increases the cleaning requirements and leads to a
build-up of aggressive sedimentation and condensation, which can damage the
boiler and also invalidates the guarantee! Using non-standard fuels can also lead
to serious problems with combustion!
For this reason, when operating the boiler:
rUse only the permitted fuels
2.5 Qualification of operating staff
CAUTION
If unauthorised persons enter the Installation room:
Risk of personal injury and damage to property
rThe operator is responsible for keeping unauthorised persons, in particular children,
away from the system.
Only trained operators are permitted to operate the unit. The operator must also have
read and understood the instructions in the documentation.
2.6 Protective equipment for operating staff
You must ensure that staff have the protective equipment specified by accident
prevention regulations!
▪ For operation, inspection and cleaning:
- suitable work wear
- protective gloves
- sturdy shoes
- dust mask
When working with dust from the electrostatic particle
separator, use dust masks in filter class FFP2 or higher

Safety | 2
B1590522_en | Operating instructions Pellet condensing boiler PE1c Pellet (ESP) 11
2.7 Safety Devices
2.1
SV
2.1 BOILER OFF (switches off the boiler to prevent overheating)
rTap “Boiler OFF"
ÄAutomatic mode is switched off
ÄControl system follows the boiler shutdown procedure
ÄPumps continue to run
3 MAIN SWITCH (switches off the power supply)
Before carrying out work on/in the boiler:
rTap “Boiler OFF"
ÄAutomatic mode is switched off
ÄControl system follows the boiler shutdown procedure
rSwitch off the main switch and let the boiler cool down
4 SAFETY TEMPERATURE LIMITER (STL) (protection against overheating)
The STL (high-limit thermostat) switches off the combustion system when the boiler
reaches 100°C. The pumps continue to run. Once the temperature falls below approx.
75°C, the STL can be reset mechanically.
5 DOOR SWITCH (protection against access to moving components)
If the insulated door opens while the boiler is operating, all of the units stop to prevent
injuries at moving components. If the insulated door remains open for more than a
specified time, the boiler automatically follows the shutdown procedure.
SV SAFETY VALVE (protection against overheating/excess pressure)
When the boiler pressure reaches a maximum of 3 bar, the safety valve opens and the
heated water is blown off in the form of steam.

2 | Safety
12 B1590522_en | Operating instructions Pellet condensing boiler PE1c Pellet (ESP)
2.8 Residual risks
DANGER
If maintenance work is performed when the system is in operation:
Risk to life from high voltage electrodes!
Before carrying out work on/in the electrostatic precipitator:
rSwitch off the power supply and take precautions to prevent accidental switching on
rEarth and short circuit HV electrodes
rAlways have work carried out by a qualified electrician
rObserve the applicable standards and regulations
ÄWork must not be carried out on electrical components by unauthorised persons
DANGER
Persons using pacemakers whilst in the immediate vicinity of the electrostatic particle
separator:
Interference of the pacemaker by electromagnetic fields of the particle separator is
possible!
Therefore:
rMaintain a safety distance of at least one metre from the electrostatic particle
separator
rPerform work only when the electrostatic particle separator is switched off
WARNING
When touching hot surfaces:
Severe burns are possible on hot surfaces and the flue gas pipe!
When work is carried out on the boiler:
rShut down the boiler according to procedure (“Boiler off” operating status) and allow
it to cool down
rProtective gloves must usually be worn for work on the boiler, and it should only be
operated using the handles provided
rInsulate the flue gas pipes and do not touch them during operation

Safety | 2
B1590522_en | Operating instructions Pellet condensing boiler PE1c Pellet (ESP) 13
WARNING
If non-permitted fuel types are used:
Non-standard fuels can cause serious faults in combustion (e.g. spontaneous
combustion of carbonisation gases / flash fires) which can lead to serious
accidents!
Take the following precautions:
rOnly use fuels specified in the "Permitted fuels" section of these operating
instructions.
WARNING
When inspecting and cleaning the boiler with the main switch on:
Serious injuries possible due to automatic boiler startup!
Before inspection and cleaning work in/on the boiler:
rSwitch the boiler off by tapping “Boiler off”
The boiler follows the shutdown procedure and switches to "Boiler off“ mode
rAllow the boiler to cool for at least 1 hour
rSwitch off the main switch and take precautions to prevent accidental switching on

2 | Safety
14 B1590522_en | Operating instructions Pellet condensing boiler PE1c Pellet (ESP)
2.9 Emergency procedure
2.9.1 Overheating of the system
If the system overheats and the safety devices fail to operate, proceed as follows:
NOTICE!Do not under any circumstances switch off the main switch or disconnect
the power supply.
rKeep all the doors on the boiler closed
rOpen all mixing valve taps, switch on all pumps.
ÄThe Froling heating circuit control takes on this function in automatic operation.
rLeave the boiler room and close the door
rOpen any thermostatic valves on the radiator and ensure sufficient heat dissipation
from the rooms
If the temperature does not drop:
rContact the installer or Froling customer services
2.9.2 Smell of flue gas
DANGER
If you smell flue gas in the boiler room:
Inhaling toxic flue gas can be fatal!
If you smell flue gas in the room where the boiler is installed:
rKeep all the doors on the boiler closed
rShut down the boiler according to procedure
rVentilate the room where the boiler is installed
rClose the fire door and doors to living areas
Recommendation: Do not install smoke alarms and carbon monoxide detectors near the
system.
2.9.3 Fire in the system
DANGER
In case of fire in the system:
Risk of death by fire and poisonous gases
Emergency procedure in case of fire:
rLeave the boiler room
rClose the doors
rInform the fire department

Notes for operating a heating system | 3
B1590522_en | Operating instructions Pellet condensing boiler PE1c Pellet (ESP) 15
3 Notes for operating a heating system
Carrying out modifications to the system and changing or disabling safety equipment is
prohibited.
Always comply with all fire, building and electrical regulations when installing or operating
the system, in addition to following the operating instructions and mandatory regulations
that apply in the country in which the tank is operated.
3.1 Installation and approval
The boiler should be operated in a closed heating system. The following standards
govern the installation:
Note on standards EN 12828 - Heating Systems in Buildings
IMPORTANT: Every heating system must be officially approved.
The appropriate supervisory authority (inspection agency) must always be informed when
installing or modifying a heating system, and authorisation must be obtained from the
building authorities:
Austria: report to the construction authorities of the community or magistrate
Germany: report new installations to an approved chimney sweep / the building
authorities.
3.1.1 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).
3.2 Installation site
Requirements for the load bearing substrate:
▪ Flat, clean and dry
▪ Non-combustible and with sufficient load-bearing capacity
Conditions at the installation site:
▪ Frost-free
▪ Sufficiently well lit
▪ Free of explosive atmospheres such as flammable substances, hydrogen halides,
cleaning agents and consumables
▪ Installation at altitude higher than 2000 metres above sea level only after consultation
with the manufacturer
▪ The system must be protected against gnawing and nesting by animals (such as
rodents)
▪ No flammable materials in proximity to the system

3 | Notes for operating a heating system
16 B1590522_en | Operating instructions Pellet condensing boiler PE1c Pellet (ESP)
3.3 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
3.3.1 Combustion air supply at the installation room
The system is operated in open flue mode, i.e. the combustion air required to operate the
boiler is drawn from the installation room.
Requirements:
▪ Opening to the atmosphere
– Weather conditions must not affect the air flow in any way (e.g. snow and foliage)
– Cross-section area free of obstructions such as cover gratings and slats
▪ Air supply lines
– For air supply lines longer than 2 metres and where mechanical means are used
to feed combustion air, the flow rate must be calculated (maximum flow rate = 1 m/
s)
Note on standards ÖNORM H 5170 - Construction and fire protection requirements
TRVB H118 - Technical directives on fire protection/prevention

Notes for operating a heating system | 3
B1590522_en | Operating instructions Pellet condensing boiler PE1c Pellet (ESP) 17
3.3.2 Simultaneous operation with other air-drawing systems
Where the boiler is operated in room air-dependent mode with simultaneous operation of
other air-drawing systems (such as room ventilation), safety devices are necessary:
▪ Air pressure monitor
▪ Flue gas thermostat
▪ Window-tilting drive system, window-tilting switch
NOTICE!Clarify the safety devices with appropriate flue sweep / chimney sweep
Recommendation for room ventilation:
Use “intrinsically-safe” room ventilation systems with F classification
As a basic rule:
▪ Room under-pressure max. 8Pa
▪ Air-drawing systems must not exceed the room under-pressure value
– If the room under-pressure value is exceeded, safety equipment (under-pressure
monitoring system) is necessary
In Germany, the following additional requirement must be observed:
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 | Notes for operating a heating system
18 B1590522_en | Operating instructions Pellet condensing boiler PE1c Pellet (ESP)
3.4 Combustion air for room air-independent operation
12
3
1Boiler
2Air extraction system (such as centralised dust extraction system, room ventilation)
3Combustion air supply from outside (irrespective of ambient air)
3.4.1 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.

Notes for operating a heating system | 3
B1590522_en | Operating instructions Pellet condensing boiler PE1c Pellet (ESP) 19
3.4.2 Supply air line
NOTICE!Install the combustion air supply (piping) in accordance with the
applicable standards
Overview of standards
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
3.4.3 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 | Notes for operating a heating system
20 B1590522_en | Operating instructions Pellet condensing boiler PE1c Pellet (ESP)
3.5 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.