Petric PP27A-G3 User manual

© Petrič d.o.o. 1
PELLET BOILER
PP27A –G3
Instructions for use, maintenance and installation
December, 2015

Instructions for Use, Maintenance and Installation Pellet boiler PP27 A –G3
© Petrič d.o.o. / 2015 2
We thank you for the trust that you’ve shown us by purchasing the PP 27A furnace.
We ask that you read the instructions for use before attempting to install and use your PP 27A
pellet boiler.
The combustion devices (hereinafter referred to as the “pellet boiler” or the “boiler”) built by
PETRIČ d.o.o. (hereinafter referred to as the “PP 27A”) are designed and tested in accordance
with the safety requirements laid out in the applicable European directives.
The instructions are intended for the end-users, the installers and the authorized service
personnel of the PP 27A pellet boiler.
If you have any doubts in connection with the instructions for use, or if you require any
clarification, please contact the manufacturer or an authorized PETRIČ d.o.o. representative.
Printing out, translating or reproducing the instructions for use, even partially, may only be done upon
obtaining an approval from the PETRIČ d.o.o. company.
The amount of carbon dioxide (CO2) formed by proper combustion of the wood biomass inside the boiler
is equal to the amount that would be emitted during the natural wood decomposition process.
The amount of carbon dioxide (CO2) produced during the combustion or decomposition of the wood is
the same as the amount of CO2that the tree sequestered in its lifetime, turning it into oxygen and
carbon.
By contrast, the use of non-renewable energy sources (wood char, heating oil, gas) emits vast
quantities of CO2that had been accumulated through millions of years, thereby contributing to the
greenhouse effect.

Instructions for Use, Maintenance and Installation Pellet boiler PP27 A –G3
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TABLE OF CONTENTS
1. THE PURPOSE OF THE INSTRUCTIONS FOR USE.................................................................................... 5
1.1. THE LABEL MEANINGS ...........................................................................................................................5
2. COMPONENTS OF THE BOILER .................................................................................................................. 6
3. THE BASIC REQUIRED STANDARDS.......................................................................................................... 7
4. BOILER SAFETY............................................................................................................................................ 7
5. RESPONSIBILITIES ....................................................................................................................................... 8
5.1. MANUFACTURER’S RESPONSIBILITY ................................................................................................... 8
5.2. USER’S RESPONSIBILITY ....................................................................................................................... 8
5.3. INSTALLERS’ RESPONSIBILITY..............................................................................................................9
6. PICKING THE BOILER UP; TRANSPORTATION AND INSTALLATION.................................................... 10
6.1. PICKING THE BOILER UP...................................................................................................................... 10
6.2. TRANSPORTING AND MOVING THE PELLET BOILER........................................................................ 10
7. INSTALLATION ............................................................................................................................................ 10
7.1. PLACEMENT........................................................................................................................................... 10
7.2. WASTE MANAGEMENT......................................................................................................................... 12
7.3. FLUE GAS EXHAUST............................................................................................................................. 12
7.4. AIR SUPPLY ........................................................................................................................................... 15
7.5. ELECTRICAL GRID CONNECTION........................................................................................................ 16
7.6. CONNECTING THE BOILER TO THE HEATING WATER CIRCUIT...................................................... 17
8. FIRST START OF THE BOILER................................................................................................................... 18
8.1. INSTRUCTIONS FOR PERSON, ANIMAL AND PROPERTY SAFETY.................................................. 18
9. SAFETY WARNING...................................................................................................................................... 19
9.1. SAFETY PRECAUTIONS FOR THE MAINTAINERS.............................................................................. 19
9.2. SAFETY PRECAUTIONS FOR THE USER ............................................................................................ 19
10. INSTRUCTIONS FOR SAFE IGNITION AND CLEANING OF THTHE BOILER.......................................... 20
10.1. INSTRUCTIONS FOR SAFE IGNITION.................................................................................................. 20
10.2. REGULAR MAINTENANCE AND CLEANING OF THE BOILER ............................................................ 20
10.3. INSPECTION AND PARTS THAT REQUIRE MAINTENANCE............................................................... 21
10.4. ADDITIONAL MAINTENANCE................................................................................................................ 23
11. IMPORTANT SAFETY DATA ....................................................................................................................... 23
12. FILLING THE PELLET HOPPER.................................................................................................................. 24
13. FUEL............................................................................................................................................................. 25
13.1. ACCEPTABLE FUEL............................................................................................................................... 25
13.2. UNACCEPTABLE FUEL.......................................................................................................................... 25
13.3. PELLET STORAGE................................................................................................................................. 25
14. THE CONTROLLER...................................................................................................................................... 26
14.1. Cautions ............................................................................................................................................... 26
14.2. Recommendations................................................................................................................................... 26
14.3. Keypad .................................................................................................................................................... 27
14.4. Menu structure......................................................................................................................................... 29
14.4.1. Navigating the menus..................................................................................................................... 29
14.5. Setting the clock...................................................................................................................................... 30
14.6. Setting the temperature........................................................................................................................... 30
14.7. Setting the operating power..................................................................................................................... 30
14.8. Setting the weekly programs ................................................................................................................... 31
14.9. Setting the fuel options............................................................................................................................ 32

Instructions for Use, Maintenance and Installation Pellet boiler PP27 A –G3
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14.10. Changing the options’ settings................................................................................................................. 32
14.11. Troubleshooting....................................................................................................................................... 33
15. WIRING DIAGRAM....................................................................................................................................... 35
16. INFORMATION REGARDING THE DESTRUCTION AND DISPOSAL OF THE BOILER........................... 36
17. WARRANTY CONDITIONS .......................................................................................................................... 37
17.1. INSPECTION:.......................................................................................................................................... 37
17.2. WARRANTY TIME CONDITIONS:.......................................................................................................... 37
17.3. GENERAL WARRANTY CONDITIONS:.................................................................................................. 37
17.3.1. We declare the following: ............................................................................................................... 37
17.3.2. Claiming the warranty..................................................................................................................... 37
17.3.3. The period of time that spare parts and service is guaranteed....................................................... 37
17.3.4. The warranty does not cover damage due to the following: ........................................................... 37
17.4. THE COMPONENTS SUBJECT TO NORMAL WEAR AND THUS NOT COVERED BY THE
WARRANTY............................................................................................................................................ 38
17.4.1. SERVICE WITHIN THE WARRANTY PERIOD.............................................................................. 38
17.5. THE COURT OF JURISDICTION............................................................................................................ 38
18. MODEL PP 27A TECHNICAL CHARACTERISTICS.................................................................................... 39
19. BOILER IMENSIONS AND CONNECTIONS................................................................................................ 41
20. DECLARATION OF CONFORMITY.............................................................................................................. 42
21. CE LABEL..................................................................................................................................................... 43
22. CONNECTION DIAGRAMS (hydraulic and electric).................................................................................. 44

Instructions for Use, Maintenance and Installation Pellet boiler PP27 A –G3
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1. THE PURPOSE OF THE INSTRUCTIONS FOR USE
The instructions for use are meant to inform the user about the measures and the equipment required to
ensure safe and proper operation of the combustion device.
Read and consider the contents of this booklet carefully. In order to properly install, use and maintain
your boiler, you will need all the information contained in this booklet.
Store the instructions carefully and safely at a suitable location; you never know when you will need
them. The instructions for use, maintenance and installation are considered an integral part of the pellet
boiler unit.
In the case of the boiler changing ownership, the new owner must receive the instructions for use along
with the boiler.
If the instructions for use get lost, you may request a new copy of the instructions from the manufacturer
or from a person authorized by the manufacturer.
1.1. THE LABEL MEANINGS
DANGER: An important instruction on how to prevent accidents, fatalities and property
damage.
DANGER DUE TO ELECTRICAL WIRING: An important instruction on how to handle
the electrical wiring of the boiler properly in order to avoid accidents, fatalities and
property damage.
DANGER OF BURNS: An important instruction on how to prevent burns.
RECOMMENDATION: A recommendation by the boiler manufacturer on how to
improve the user’s experience in connection with the boiler, prolong the lifetime of the
boiler, etc.

Instructions for Use, Maintenance and Installation Pellet boiler PP27 A –G3
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2. COMPONENTS OF THE BOILER

Instructions for Use, Maintenance and Installation Pellet boiler PP27 A –G3
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3. THE BASIC REQUIRED STANDARDS
The boiler PP27A was designed, manufactured and tested in accordance with EN 303-5: 2012.
We took into account the directives and standards as follows:
EC Machinery Directive 2006/42/EC,
EC Electromagnetic compatibility directive (EMC) 2004/108/EC
EC Low voltage directive (LVD) 2006/95/EEC
Harmonised standards:
EN ISO 12100: 2011;
EN 60204-1: 2006;
EN ISO 13857: 2008;
EN 61000-6-3: 2007;
EN 61000-6-2: 2005;
EN 61000-3-3:2009;
EN 61000-3-2: 2006;
EN 61000-3-2: 2006 A1: 2009
4. BOILER SAFETY
The boiler PP27A is tested according to standard EN 303-5:2012 and has passed all safety tests
required by this standard.
In addition to the safe operation controlled by the electronics are installed on the boiler additional safety
components, which operate independently of the electronics. List of this components are given in Table
1.
Table 1: Additional safety components
Name
Failure
Function
Pressure switch 1
Blockage of the chimney
Turn off dosing system
Time relay 2
Fan failure or fan blockage
Turn off dosing system
Time relay 1
Uncontrolled continuous dosing
Turn off dosing system
Pressure switch 2
Open cumbustion chamber door
Turn off dosing system
Thermostatic switch STB
Overheating water
Turn off dosing system
Proper and safe operation of the boiler is the responsibility of the installer and the boiler user.
Instructions for safe installation and use of the boiler are listed later in this “User manuals”.

Instructions for Use, Maintenance and Installation Pellet boiler PP27 A –G3
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5. RESPONSIBILITIES
5.1. MANUFACTURER’S RESPONSIBILITY
By supplying these instructions, PETRIČ d.o.o. disclaims any civil or criminal liability arising directly or
indirectly from the following:
an accident due to non-compliance with the standards and specifications laid out in these
instructions;
accidents due to disallowed and inappropriate operation by the user;
accidents due to modifications and repairs that were not authorized by the manufacturer,
PETRIČ d.o.o.;
poor maintenance;
unforeseen situations;
accidents due to the use of non-original or unsuitable spare parts.
PETRIČ d.o.o. shall not be held liable for any reimbursement of costs due to direct or indirect damage
caused by the product or connected to the product.
5.2. USER’S RESPONSIBILITY
The user must observe the following during the operation of the boiler:
the boiler should only be operated by a suitably trained adult person who is familiar with
the instructions regarding the boiler operation;
with the exception of the trained operator and the authorized boiler service personnel, or
adults authorized by the service personnel, no other person should be allowed in the
vicinity of the boiler;
the pellet boiler must be used according to the instructions laid out in the “Instructions
for Use, Maintenance and Installation” and in compliance with all the local regulations
valid at the site of the installation of the pellet boiler;
the boiler should be fuelled exclusively with wood pellets with the required properties, as
specified later in the text;
every time before starting the boiler, the operator must verify the electric power supply
of the boiler and the sealing of the chimney and chimney connectors; the operator must
also visually inspect the boiler to see if it’s in a suitable condition for start up.
only remove the ash from the boiler when both the boiler and the ash are at the same
temperature as the room where the boiler is installed (otherwise burns may occur);
clean the boiler using non-flammable cleaning agents only;
the ash from the boiler should only be disposed of and stored in a non-flammable
container with a lid, in order to prevent ignition;
it is forbidden to keep or store flammable or explosive substances in the room where the
boiler is installed;
the maximum permissible temperature of the water in the boiler is 80°C;
the minimum temperature of the water in the boiler during operation should not be lower
than 55°C, in order to prevent flue condensation in the boiler;
if there is a danger of explosion, fire or a gas leak, do not start the boiler;
when shutting the boiler off, observe the shutting off instructions later in the text; never
extinguish the boiler forcefully, such as by pouring or loading any kind of substance into
any part of the boiler or the chimney connector.
Register the boiler to concessionaires to implement the chimney-sweeping service
*User is obliged by the law to register the pellet boiler to chimney-sweeping service that
review the device and chimney connector
*depends of state law

Instructions for Use, Maintenance and Installation Pellet boiler PP27 A –G3
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5.3. INSTALLERS’ RESPONSIBILITY
The installer’s responsibilities include:
checking the pipes, the plumbing, the air supply and all the fixtures required for the
installation of the pellet boiler;
ensuring that the boiler is installed in compliance with the local regulations valid at the
site of the installation.
The installer must check the following:
the type of the machine they are installing;
the suitability of the installation site of the unit, that is, the minimum acceptable size of
the room where the pellet boiler is to be installed;
the manufacturer’s instructions regarding the combustion device that pertain to the flue
gas exhaust requirements;
the inner diameter of the chimney; the material used in its construction; whether it is
straight, that is, has a uniform surface; and that it is not obstructed;
the height and the vertical extension of the chimney;
whether the chimney has a cap of suitable durability;
the sealing performance of the chimney connection from the boiler to the chimney;
the possibility of an external air inlet;
If the results of the checks mentioned above are positive, the installation may be commenced.
Carefully follow the instructions supplied by the manufacturer, as well as the applicable safety
and fire safety standards.
After the installation has been completed, the installer must provide the buyer with the
following:
the manufacturer’s Instructions for Use, Maintenance and Installation (if they’re not
already included with the unit);
the documentation required by the applicable standards.
The installer takes full responsibility for the installation.

Instructions for Use, Maintenance and Installation Pellet boiler PP27 A –G3
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6. PICKING THE BOILER UP; TRANSPORTATION AND
INSTALLATION
6.1. PICKING THE BOILER UP
Waiting to be picked up at the manufacturer’s premises, the boiler is fully packaged, protected with
cardboard and plastic foil and set on a wooden base (a pallet) to facilitate transport. The Instructions for
Use, Maintenance and Installation are inside the boiler.
6.2. TRANSPORTING AND MOVING THE PELLET BOILER
From the time of picking the boiler up, all the transportation and movements are done on your own
responsibility. Take care of your safety when moving the boiler.
WHEN TRANSPORTING AND MOVING THE BOILER, YOU MAY ONLY USE
ACCESSORIES WITH SUFFICIENT LOAD BEARING CAPACITY. AVOID JERKY
AND/OR SUDDEN MOVEMENTS OF THE BOILER.
7. INSTALLATION
The responsibility for the installation tasks performed on-site lies solely with the buyer.
Before the boiler installation both installation place and chimney connection must be reviewed
and confirmed by the Chimney-sweeping service.
Before beginning the installation, the installer must check all the safety standards required by
law and in particular the following:
that the norms regarding pellet boiler installations conform to the local, national and
European norms;
that the requirements in this document are observed;
that the plumbing and the air supply are suitable for the type of installation;
that no temporary electrical connections have been carried out using uninsulated cables;
that the electrical system is properly grounded;
that personal protective equipment has been used throughout the process, along with all
the protections required by law;
that sufficient room is left to enable maintenance, in accordance with these instructions
(Figure 1).
7.1. PLACEMENT
When placing the boiler at the final location, consider the following:
if the walls and/or the floor in the vicinity are covered with a material that is not heat
resistant, it is necessary to provide appropriate protection using non-flammable
insulation;
maintain a safe distance (c. 50 cm) between the pellet boiler and any furniture,
appliances, etc;
in order to protect floors made of flammable materials, we recommend placing a metal
sheet of 3 to 4 mm thickness underneath the boiler; it should exceed the boiler depth by
at least 30 cm in the front;
storing flammable substances in the room where the boiler is installed is forbidden;
The pellet boiler should be installed at least 50 cm away from the walls, in order to
ensure a sufficient supply of air and facilitate access in case servicing is required;

Instructions for Use, Maintenance and Installation Pellet boiler PP27 A –G3
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Figure 1
if the pellet boiler is installed in a kitchen where there are other devices that are drawing
air off (e.g. an exhaust hood, various vent fans, etc.) or in a room with other solid fuel
combustion devices (e.g. a solid wood boiler, etc.), make sure that the volume of air
supplied is sufficient for the safe operation of the combustion device;
if the flue gas exhaust is routed through the ceiling, the penetration must be insulated
with a non-flammable insulation membrane;
Once the boiler is positioned, it has to be levelled using levelling screws. Take care when
considering the load bearing capacity of the floor; you have to take into account not only
the boiler itself but also a hopper full of pellets and a boiler full of water!

Instructions for Use, Maintenance and Installation Pellet boiler PP27 A –G3
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7.2. WASTE MANAGEMENT
DISPOSE OF THE PACKAGING MATERIAL IN A WAY THAT KEEPS IT OUT OF REACH
OF CHILDREN. THE BAG, FOIL, POLYSTYRENE, ETC. PRESENT A RISK OF
SUFFOCATION.
After the boiler has been installed, the remaining packaging materials should be handled in accordance
with applicable local regulations valid at the installation site.
7.3. FLUE GAS EXHAUST
The flue gas exhaust must be implemented in accordance with the applicable regulations. Only
stainless steel may be used for the flue gas exhaust. The flue gas piping must not be joined together
with the exhaust pipes of any other combustion devices. Routing the flue gas exhaust into enclosed or
semi-enclosed spaces, such as, for instance, a garage, a narrow passage or corridor, an underpass, or
any other similar spaces, is not permitted. When the connection between the boiler and the chimney
connector is made, the chimney expert should verify that the chimney connector has not been damaged
or punctured and that it’s sealing properly. If the chimney connector is found unsuitable, its cladding has
to be replaced with new, intact material and the connector must subsequently be re-approved by the
relevant authority.
The flue gas exhaust should be grounded according to the applicable
regulations. (The ground connection implementation is dictated by the law). The
ground connection must be independent from the boiler unit.
As regards the dimensions and the construction material, the chimney must be fully compliant with all
the applicable standards valid in the area of installation.
Chimneys in poor condition and/or those constructed from unsuitable materials (asbestos, galvanized
steel sheeting, etc., with rough or porous surface) contravene the law and endanger the operation of the
boiler.
The smoke may also be exhausted using a traditional chimney (see the figure below), provided that the
following rules are followed:
the chimney’s state of maintenance is inspected. If the chimney is old, it is advisable to renovate
it by inserting a stainless steel pipe, properly insulated with glass wool or vermiculite. To ensure
proper maintenance and/or a suitable renovation, seek the help of a chimney sweeping service;
the smoke may only be routed directly into a chimney in cases where the chimney is at most
20 x 20 cm or 20 cm in diameter and equipped with an inspection opening;
if the chimney is larger than that, an appropriately insulated stainless steel pipe of sufficient
diameter must be inserted;
For chimney diameter 20cm should be install the condensation drain or used the type of
the chimney with condensation tank.
make sure that the chimney connection is properly sealed;
avoid contact with flammable materials (such as, for instance, partially burned wood stubs); in
any case, there must be flame-resistant protection.
Key:
A) Wind-proof protection cap
B) Maximum dimensions 20 x 20 cm or 20 cm
diameter, maximum height 5-6 m
C) O-ring
D) Inspection opening
E) Condensate drain
F) The access gully
Figure 2
Due to the high efficiency of the boiler the flue gas temperature at
the exit of the boiler are relatively low. This may often occur the
condensation of the flue gases in the chimney. Modern chimneys
are usually all equipped with condensation containers-tanks, it
makes sense and is recommended over the gully to connect with
a drain system.

Instructions for Use, Maintenance and Installation Pellet boiler PP27 A –G3
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The diameter of the pipe depends on the power of the pellet boiler. This pellet boiler is designed for
pipes of 100 mm diameter. If you need to use pipes of 120 mm diameter, mount a 100 mm diameter T-
junction onto the boiler and then use a reducer Ø100/Ø120 mm.
Key:
A) Vermiculite and/or glass wool
B) Aluminium pipes
C) Cover plate
Figure 3
When using connectors between the pellet boiler and the chimney, you are required to use a T-junction
with an inspection opening looking directly into the boiler, or an elbow with a cleaning hatch. A T-
junction must facilitate collecting the ash that accumulates at the bottom of the pipe, as well as regular
cleaning, without requiring the disassembly of the piping. The smoke in the chimney connector is under
slight pressure, so it is necessary to verify that the ash cleaning cover is hermetically closed and that it
remains so after every cleaning. Make sure that the assembly was carried out correctly and check the
gasket condition.
It is recommended to avoid long horizontal runs of the pipes leading to the chimney. If this
is not possible, the pipes should not slope downwards, but upwards, at an angle of at least
5%. A horizontal pipe run should not exceed 3 m in length.
It is not recommended to run a pipe directly from the pellet boiler to the chimney with a
horizontal pipe longer than 1 m.

Instructions for Use, Maintenance and Installation Pellet boiler PP27 A –G3
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SAFETY WARNING
The flue gas exhaust MUST NOT BE CONNECTED:
to exhaust ducts used by other combustion devices (boilers, stoves, fireplaces,
etc.);
to vent systems (caps, vent fans, etc.);
using flexible piping.
The installation of draft control valves is forbidden!
Chimney connection using the 100 mm diameter pipe between the pellet boiler and the chimney
should satisfy the following:
no more than 6 m in total length;
every 90° elbow joint shortens the permissible maximum length of the chimney
connection by 1 m;
the length of the installed connector should be 3 m at most;
every elbow should be equipped with a hatch to enable cleaning;
the joints between the pipe segments must be sealed;
when mounting the chimney connector to the boiler, keep it as short and stable as
possible;
the chimney connector pipes longer than 1 m should be fixed properly, so that they
don’t loosen;
a chimney connector that is more than 1 m in total length should be fixed properly,
so that it doesn’t loosen;
all the chimney connector parts have to be removable and have to enable interior
inspection.
The total draft depends primarily on the chimney, which must contain no obstructions, which
include, for instance, constrictions and/or various angled connections. It is recommended to
only use pipe elbows at an angle of 45° at most; it’s better yet to use an angle of 30°.
In any case, it is imperative to ensure an initial vertical, straight pipe run of at least 1.5 m length,
this is the only way to ensure proper removal of flue gases.
If the draft in the exhaust system is poor (numerous elbows, inappropriate termination,
constrictions, etc.), this is due to the obstructions just listed. In such a case, the flue gas
exhaust will not be optimal, necessitating the adjustment of the pellet boiler parameters in order
to adapt the boiler operation to its exhaust system. This may only be carried out by an
authorized person.
The system of flue gas exhaust from the pellet boiler works on the basis of negative pressure
and the barely detectable pressure of the exhaust pipe. It is very important for the flue gas
exhaust to be hermetically sealed.
It is necessary to analyse the layout and structure of the space where the chimney is located. In
case it’s routed through a wall and/or the roof, it has to be integrated properly and in accordance
with fire safety standards; it also requires approval by the relevant authorities.

Instructions for Use, Maintenance and Installation Pellet boiler PP27 A –G3
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7.4. AIR SUPPLY
The air from the room that is necessary for complete combustion must be replaced with fresh air, either
through an opening in the wall, a slit in the boiler room door, or an open window. This will improve the
combustion and ensure a lower pellet consumption.
It is advisable to perform regular inspections of the air supply ducts, as this is the
only way to make sure that sufficient air is supplied to the combustion chamber.
To implement an external air intake or external air supply, you need a 110 mm diameter pipe with a
maximum length of 10 m. Every 90° elbow joint shortens the permissible maximum length of the air
supply line by 1 m; If the air supply pipe is longer than that, its diameter must be increased.
If a grate mounted on the facade is used, the opening for the draft has to be at least 100 cm². The
opening for the fresh air supply must be equipped with a grill to protect it from rain, wind and insects.
The opening must be made in the external wall of the room where the pellet boiler is installed (Figure 4).
Figure 4
DANGEROUS
It is forbidden to supply the air from a storage space containing flammable materials or a space
where a fire might start.
If there are other combustion devices located in the same room, the volume of air supplied must
be sufficient to support complete combustion in all the combustion devices.

Instructions for Use, Maintenance and Installation Pellet boiler PP27 A –G3
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7.5. ELECTRICAL GRID CONNECTION
The combustion unit requires an electrical connection. Our pellet boilers are equipped with a medium
temperature power supply cable. If the power supply cable is damaged and needs to be replaced, call
our repair service.
DANGEROUS
Before you begin with the electrical connection, make sure:
the electrical wiring characteristics fit the requirements listed on the combustion device;
that the flue gas exhaust is grounded according to the applicable regulations and local
directives (the ground connection implementation is dictated by the law);
the power supply cable must never reach a temperature higher than 80° above ambient. If
you wish to connect the boiler directly to the electrical grid, insert a bipolar switch with
contact point spacing of at least 3 mm, suitable for use with the required voltage and in
compliance with applicable regulations. Yellow/green striped grounding cable must be
interrupted with the switch. The bipolar switch must be accessible at all times, even after
the boiler has been installed.
The machine operates on 220 V –50 Hz. Make sure that the electric cables are not routed
under the boiler, that they are far enough from hot surfaces and that they are not
touching any sharp parts that could damage them. If the voltage supplied to the boiler is
too high, the life expectancy of the electrical components is substantially reduced.
The pellet boiler must be connected to the electrical grid. The power supply cable for the boiler is
marked “Napajanje”. The other cable is for the connection of the pump; it is marked “Črpalka”.
DANGEROUS
If the power supply cable is damaged, it needs to be replaced. Only an authorized person may
replace it, and the connection of the boiler to the electrical grid may likewise only be performed
by an expertly trained person! The electrical connection has to be easily accessible even after
the boiler has been installed.

Instructions for Use, Maintenance and Installation Pellet boiler PP27 A –G3
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7.6. CONNECTING THE BOILER TO THE HEATING WATER CIRCUIT
DANGEROUS
The connection of the boiler to the heating water circuit may only be performed by a suitably
trained installer.
The joints and connections of the pipes should not leak (guaranteed water-tightness).
The connection should be carried out according to the following procedure (see chapter 19. and 22):
connect the cold water line of the heating water circuit to the connector marked “Hladna voda”;
connect the hot water line of the heating water circuit to the connector marked “Topla voda”;
the filling line for the boiler should be connected to the connector marked “Polnilni priključek”.
To assess connections for »hot« and »cold« water it is necessary to remove the service panel with
keyboard »A« and then connect both line:
»Hot« water with connector »B«
»Cold« water with connector »C«
Connection is carried out through the side slots which have been previously removed. (See Figure 5)
Figure 5
Return water protection system
For proper operation of the boiler, return water temperature should be min.55°C. This is achieved by
using water protection system shown in Chapter 22 on page 44.

Instructions for Use, Maintenance and Installation Pellet boiler PP27 A –G3
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8. FIRST START OF THE BOILER
The first start of the boiler may only be performed by an authorized person;
otherwise, the warranty is voided.
After starting the boiler for the first time, an operation test of at least 30 minutes duration has to be
performed.
8.1. INSTRUCTIONS FOR PERSON, ANIMAL AND PROPERTY SAFETY
We would like to inform the installer about some general guidelines that need to be followed, if the pellet
boiler is to be installed correctly. Those are the standards required, but they are not sufficient; for more
in-depth information, you have to read the rest of the Instructions for Use, Maintenance and Installation.
Connect the pellet boiler to the electrical grid;
do not allow children and animals to approach the boiler;
do not use any fuel other than high quality pellets;
inform all users about possible risks and dangers and teach them how to use the pellet boiler;
if the pellet boiler is set on a wooden floor, it is advisable to insulate it.
DANGEROUS
The pellet boiler operates by maintaining a negative pressure in the combustion chamber, so
make sure that the flue gas exhaust is SEALED, BOTH THERMALLY AND AGAINST SMOKE
EMISSION.
When the boiler has been ignited for the first time, part of the paint that the boiler is coated with
evaporates*, so it is essential that you ventilate the room afterwards.
(*because of stabilization after the painting process)
Mandatory measurement of flue gases emission
In the first start-up of the boiler it is mandatory to carry out emission measurements of flue gases
which can be performed by an authorized service technician or the concessionaire for the
chimney-sweeping services.

Instructions for Use, Maintenance and Installation Pellet boiler PP27 A –G3
© Petrič d.o.o. / 2015 19
9. SAFETY WARNING
9.1. SAFETY PRECAUTIONS FOR THE MAINTAINERS
Before complying with the safety regulations the maintainer must:
always use safety devices and individual safety equipment in accordance with the 89/391/EEC
directive;
disconnect the electrical power supply before starting any work;
always use suitable tools;
make sure, before starting any work on the boiler, that both the boiler and the ash inside are
cold, especially before touching either;
CONSIDER THE BOILER UNUSABLE IF EVEN A SINGLE SAFETY DEVICE IS FAULTY,
INCORRECTLY REPAIRED OR MALFUNCTIONING!
Make no changes of any kind, for any reason, except as allowed and/or approved by the
manufacturer or an authorized person;
always use original spare parts; don’t wait for a part of the boiler to become worn before
replacing it. Replacing a worn part before it breaks down helps prevent injuries due to a sudden
break-down of a component; such injuries may seriously endanger persons and/or their
property.
Check for any condensation that would suggest water infiltration or the cooling of flue gases.
We recommend finding out the cause for the condensation, so that normal boiler operation can
be re-established.
9.2. SAFETY PRECAUTIONS FOR THE USER
The space where the pellet boiler is to be located, or the installation site, must comply with local,
national and European norms.
The pellet boiler is a combustion device. Certain external boiler surfaces may reach very high
temperatures during operation.
The pellet boiler is designed to burn only wood pellets
(pellets of 6 mm diameter and 30 mm length, with humidity content up to 10%).
Children must not approach the boiler during operation and play with it!
When using the combustion device, comply with the following:
DO NOT approach and do not touch the combustion chamber door during the operation
of the boiler, as there is a DANGER OF BURNS!
DO NOT approach and do not touch the chimney connection during the operation of the
boiler, as there is a DANGER OF BURNS!
DO NOT clean any parts of the combustion device during the operation of the boiler!
Do not open the combustion chamber door during the operation of the boiler; proper
combustion requires the combustion chamber door to be hermetically sealed.
DO NOT remove ash during the operation of the boiler!
DO NOT allow children and animals to approach the pellet boiler!
OBSERVE THE REQUIREMENTS IN THIS DOCUMENT!
Use exclusively wood pellets compliant with the specifications laid out later in the text!

Instructions for Use, Maintenance and Installation Pellet boiler PP27 A –G3
© Petrič d.o.o. / 2015 20
Observe the maintenance instructions!
DO NOT use the pellet boiler in case of incorrect operation or other abnormalities,
unusual sounds and/or suspicious malfunctions!
The combustion chamber contains rotating parts that can injure you!
DO NOT spill water over the boiler and do not use water to extinguish the flames in the
combustion chamber!
DO NOT lean on the boiler, as it might be unstable and tip over!
DO NOT use the pellet boiler as a support or fasten other objects to it!
DO NOT leave the hopper cover open!
DO NOT touch the painted parts of the boiler during its operation!
DO NOT use wood or wood char in the pellet boiler!
DO NOT use the boiler as an incinerator!
Always ensure complete safety!
10. INSTRUCTIONS FOR SAFE IGNITION AND CLEANING OF
THTHE BOILER
10.1. INSTRUCTIONS FOR SAFE IGNITION
NEVER use heating oil, lamp oil or any other oil, nor any other flammable liquid to ignite the
pellet boiler. Keep all such liquids far away from the boiler during its operation.
Make sure that the pellet boiler stands securely and that it doesn’t move.
Verify that you have closed the combustion chamber door properly and that it is closed during
the operation of the boiler.
Only vacuum clean the ash when the pellet boiler is cold.
Do not use abrasive agents to clean the pellet boiler.
10.2. REGULAR MAINTENANCE AND CLEANING OF THE BOILER
The pellet boiler is equipped with an automatic heat exchanger scrubbing device and a device for
automatic removal of ash from the combustion chamber. Despite the automatic ash removal we
recommend regular inspection and, if necessary, cleaning of the combustion vessel or the chamber. It
bears keeping in mind that ash is an insulator and that a poorly cleaned boiler will lead to higher pellet
consumption, as well as a higher chance of malfunctions.
When using pellets that comply with the specifications laid out later in the text, the ash container needs
to be emptied either once per month, or once per every 3-4 hoppers worth of pellets burned, but this is
not a rule! The rate of ash accumulation in the boiler depends on several different factors, so we
recommend paying special attention to the ash build-up after the commencement of boiler operation.
The use of a vacuum cleaner with a dust separator will simplify the cleaning of the ash from the boiler.
Before starting any maintenance, including any cleaning, observe the following safety measures:
Safety warning
Always make sure that the pellet boiler and the ash within are cold!
Turn off the pellet boiler before starting any work!
Vacuum the ash from the combustion chamber whenever you empty the ash container;
vacuum and carefully clean the combustion vessel whenever you empty the ash container
(only when the boiler is cold)