Cola DOMUSFIRE C29 User manual

DOMUSFIRE C29 - C351
Installation,
use and maintenance manual
Heating Boiler
model :DOMUSFIRE C29 - C35
Read the instructions carefully before installation, use and maintenance.
The manual is an integral part of the unit.
484270010-EN_10/12
Hardware - M

DOMUSFIRE C29 - C352
1 GENERAL INFORMATION
1.1 Introduction
1.2 Using the manual
1.3 Safety rules
1.4 Technical description
1.5 Permissible use and fuel
1.6 Accessories supplied
1.7 Reference standards
1.8 Data plate
1.9 Boiler decommissioning
1.10 Instructions for requesting assistance and
replacement parts
2 TRANSPORT AND INSTALLATION
2.1 Conditions of supply, transport and storage
2.2 Place of installation, positioning and fire prevention
safety
2.3 Air inlet
2.4 Fume exhaust
2.4.1 Types of installation
2.5 Brazier and turbulator position check
2.6 Electrical connection
2.7 Wiring diagram
2.8 Wiring diagram for zone system
2.9 Plumbing connections
2.9.1 System water filling
2.9.2 System water characteristics
2.9.3 DHW system
2.9.4 Boiler hydraulic diagrams
2.10 Emergency
3 BOILER SAFETY
3.1 Safety distance from flammable materials.
3.2 Fume exhaust safety
3.3 Combustion chamber overpressure safety
3.4 Overheating - thermostats
3.5 Safety against flareback in the
pellet chute
3.6 Overcurrent electrical protection device
3.7 Water circuit overpressure safety
3.8 Fume extractor fan failure
4 BOILER USE
4.1 Introduction
4.2 Description of control panel
4.3 Lighting
4.3.1 Check before lighting
4.3.2 Startup stage
4.4 Work stage
4.4.1 Modifying the water temperature setting
4.4.2 Restart from STANDBY
4.4.3 Cleaning the brazier
4.4.4 DHW with rapid heat exchanger
4.4.5 DHW with storage tank
4.4.6 System with puffer / heat accumulator
4.5 Shutting down
4.6 Menu
4.6.1 menu 01 – chrono setting
4.6.2 menu 02 - user adjustment
4.6.3 menu 03 - user setting
4.6.4 menu 04 - boiler status
4.6.5 menu 05 - installer adjustments
4.7 Thermostat - external chronothermostat
4.8 Idle period (end of season)
5 BOILER CLEANING
5.1 Cleaning the brazier - brazier holder
5.2 Cleaning the ash container
5.3 Cleaning the fume extractor and
combustion chamber
5.4 Cleaning the air flow meter
5.5 Cleaning the flue - flue connection
5.6 Cleaning the exchanger with turbulator-
shaker device
6 MAINTENANCE
6.1 Introduction
6.2 Removing the boiler cladding
6.3 Boiler internal parts
6.4 Electrical components
6.5 Standard hydraulic components
7 TROUBLESHOOTING
7.1 Alarm management
8 ENCLOSURES
8.1 CE marking informations
8.2 Warranty conditions
8.3 Summary: GENERAL INFORMATION
8.4 Summary: GENERAL CLEANING

DOMUSFIRE C29 - C353
1 GENERAL INFORMATION
1.1 Introduction
Dear Customer,
First of all we wish to thank you for the trust placed in us by purchasing one of our products. Please read and
carefully follow the advice given in this installation, use and maintenance manual in order make best use of the
product.
1.2 Using the manual
The Manufacturer reserves the right to make technical or aesthetic changes to the products at any time without
notice.
Boiler installation, use and maintenance operations must comply with the requirements given in this manual as well
as the European, National, Regional, Provincial and Municipal laws and regulations.
The drawings, measurements, diagrams and any other configurations are given only by way of example.
This manual is intended for the user of the heating/hot water system and is an integral part of the product; make sure
it always stays with the unit, even if sold, transferred to another owner or installed in another place, so that it can be
consulted at any time.
If lost or damaged, ask the authorised Service Centre for a copy so that the unit always has its own manual.
This symbol indicates the presence of an important message; failure to pay attention to it can result in
serious damage to the boiler and even injury.
Pay special attention to “words in bold face"
1.3 Safety rules
-Read the use and maintenance manual before installing, lighting and servicing the boiler.
-Have installation, the electrical connection, testing and maintenance carried out by a qualified and/or authorised
technician.
- Connect the boiler to an approved flue via an inspectionable terminal. The connection of more than one unit is
possible only if allowed by the local regulations and by the flue control authority.
-Connect the boiler to the extraction system by means of a pipe or air inlet from outside.
-Connect the boiler to an approved 230 V-50 Hz electrical socket.
-Make sure the electrical system and the sockets are suitable for the maximum absorption
of the unit, specified on the label and in this manual.
- The power plug must be easily accessible.
- Connect the unit to the heating system; under no circumstances can it be used without the hydraulic connection
and without water in the heating chamber and system.
- This unit must not be used by people (including children) with limited physical, sensory or mental abilities or
without experience and knowledge of it, unless instructed in its use by those responsible for their safety.
- Children must be supervised to make sure they do not play with the unit and in the place of installation.
- Arrange the power cable and any cables of external sensors so that they do not touch hot parts of the unit.
- Do not operate the unit with the fire door and/or ash box door open.
-Do not close or reduce the size of the combustion air inlet and fume exhaust openings.
-The boiler must not be used as an incinerator, but exclusively to heat the water of the heating and/or DHW
system, only using wood pellets having the characteristics described in this manual as fuel.
- Do not use flammable liquids or substances to light the boiler.
- The boiler must not be used as a waste incinerator.
-Do not handle easily flammable or explosive substances near the boiler while it is in operation.
- Avoid direct contact with parts of the unit that may become very hot during operation.
-The boiler must be disconnected from the power supply and cold before carrying out any maintenance.
-Ensure an ambient temperature of between 0°C and 35°C in the place of installation, avoiding too high air
humidity (e.g. in the presence of laundry hanging out to dry).
-Do not handle easily flammable or explosive substances near the boiler while it is in operation.
- Do not modify safety or adjustment devices without the manufacturer's express permission.
- Any tampering and/or unauthorised replacements with non-original parts of the boiler can create a risk for the
user's safety and relieves the manufacturer of any civil or penal liability.
- Only use original replacement parts recommended by the manufacturer.
-In case of malfunction, the boiler can be switched on again only after eliminating the cause of the problem; in
any case, do not disable the safety systems.
- In case of fire, turn the heating system off, disconnect the power and use adequate systems to extinguish the
flames, and/or call the Fire Department.
-Clean the brazier regularly at every lighting and/or pellet reloading.

DOMUSFIRE C29 - C354
-Avoid the formation of smoke and unburned products during lighting and/or normal operation; an excessive
amount of unburned pellets in the brazier must be removed manually before proceeding with lighting.
-Service the boiler at least once a year, planning it in advance with the personnel of the authorised Service
Centre.
-In case of operation faults, the boiler can only be relit after eliminating the cause of the problem; otherwise,
contact the After-Sales Service.
The manufacturer declines any liability for problems, breakage or accidents caused by failure to follow or
apply the instructions contained in this manual.
1.4 Technical description
The boiler works exclusively on pellets and enables easy installation with the heating and DHW system. Its
automatic control systems ensure optimum thermal efficiency and complete combustion; there are also systems to
ensure safe operation for the internal components and the user. This unit must only be used for heating water to a
temperature lower than boiling point.
When correctly installed, the unit works in any outside climatic conditions; in any case, in critical conditions (strong
wind, frost, etc. ) the safety systems can cut in and shut down the boiler.

DOMUSFIRE C29 - C355
Technical data - boiler model DOMUSFIRE

DOMUSFIRE C29 - C356
Overall dimensions Pellet boiler model DOMUSFIRE C29 - DOMUSFIRE C35
DETAIL A
KEY:
Power cable connection
Overpressure water discharge (1/2" F - 3 bar )
Heating system return (1" M)
Combustion air inlet ø 60mm
Water supply connection (1/2 F)
System water drain
Connection - delivery without pump (1" M)
Delivery pump inspection
Heating system delivery (1" M)
Fume exhaust pipe connection ø 100mm
Pressure/temperature gauge
Control panel model EVO
System water drain
Door to access fire door and ash box
Adjustable feet
Pellet hopper door
Turbulator shaker knob
KEY - OPTIONAL ELEMENTS
S - OPT DHW delivery pump inspection
T - OPT DHW return (3/4" pump)
U - OPT DHW delivery (3/4" M pump)
V - DHW overpressure water discharge (1/2" F - 6 bar)
W - OPT DHW return (1/2" M exchanger)
Z - OPT DHW delivery (1/2" M exchanger)
ACCESSORIES ON REQUEST
- DHW ASSEMBLY WITH PUMP AND EXCHANGER INSIDE
BOILER
- DHW ASSEMBLY WITH PUMP INSIDE BOILER
- SUPPLEMENTARY PELLET HOPPER - CAPACITY approx.
250 kg

DOMUSFIRE C29 - C357
Fire door opening - closing Boiler model DOMUSFIRE
1.5 Permissible use and fuel
The pellet boilers work exclusively on pellets in various types of wood complying with Standard DIN plus 51731 or
UNI EN 14961-2 or Ö-Norm M 7135 or having the following characteristics:
Heat value min 4.8 kWh/kg (4180 kcal/kg)
Density 680-720 kg/m3
Moisture max 10% weight
Diameter: 6 +0.5 mm
Ash percentage max 1.5% weight
Length: min 6mm- max 30 mm
Composition: 100% untreated wood from the wood industry or post consumer without added binding
substances or bark, complying with the current regulations
Packing in bags made from environmentally friendly or biodegradable material or paper
The pellet hopper is at the back of the boiler. The door is located in the top part and loading occurs manually only
with the boiler off, making sure not to overfill.
The use of pellets with characteristics different from those tested by the technician during first lighting involves a new
setting of the boiler pellet loading parameters; this operation is not covered by the warranty.
- Store the pellets in a dry place.
- For reasons of regular and efficient operation, pellets or other fuels cannot be manually loaded in the
brazier.
- Over time, the pellet hopper accumulates dust which could compromise proper feeding, therefore it is
advisable to remove any dust before reloading pellets.
- Do not load non-conforming fuels in the hopper.
- Do not put foreign bodies such as containers, boxes, bags, metals, etc., in the hopper.
- The use of poor quality or non-conforming pellets will damage and compromise the unit's operation,
invalidating the warranty and relieving the manufacturer of any liability.
1.6 Accessories supplied
The supply includes:
Power cable;
Installation, use and maintenance manual;
Opening - closing key.
To open the door, fit the handle
supplied and turn it clockwise
Fire and ash box door
opening-closing handle;
- Opening: anticlockwise
- Closing: clockwise
To open the outer door, pull
outwards.

DOMUSFIRE C29 - C358
1.7 Reference standards
Standard UNI 10683:2005 : Installation requirements for heat generators burning wood or other solid biofuels;
Standard UNI EN14785:2006 : Requirements for design, manufacture, construction, safety and performance,
instructions and marking, together with the relevant test methods for approval of
units burning pellets ;
Standard UNI EN303-5:2004 : Terminology, requirements, tests and marking relevant to Boilers for solid fuels, with
manual and automatic feed ;
Standard UNI 10412-2:2009 : Safety requirements for domestic-type heating units using heat generators fed with
solid fuel - part 2 ;
Standard CEI EN 60335-1 : Safety of electrical appliances for domestic and similar use - part 1;
Standard CEI EN 60335-2-102 : Safety of electrical appliances for domestic and similar use - part 2;
Standard CEI EN 55014-1 : Electromagnetic resistance - Requirements for electrical appliances, electric tools and
similar electrical equipment - Part 1: Interference;
Standard CEI EN 55014-2 : Electromagnetic resistance - Requirements for electrical appliances, electric tools and
similar electrical equipment - Part 2: Immunity; Product family standard;
Standard CEI EN 61000-3-2 : Limits for harmonic current emissions (Input current ≤16 A per phase);
Standard CEI EN 61000-3-3 : Limitation of voltage fluctuations and flicker in low voltage supply systems for
equipment with nominal current ≤16 A;
Standard CEI EN 62233 : Measuring methods for electromagnetic fields of electrical household appliances and
similar with reference to human exposure.
Standards DIN plus 51731 - UNI EN14961-2 - Ö-Norm M 7135 : Standards regarding the specifications and
classification of pellets.
1.8 Data plate
The data plate is visible on the inside of the pellet hopper door or on the back of the boiler. It gives the following
data. On it are listed all the technical data in the table par.1.4.
1.9 Boiler decommissioning
When the unit is no longer to be used, disconnect it from the power supply and empty all pellets from the hopper. For
disposal, the boiler must be sealed inside strong packing; contact the local authority in charge of such operations in
order to proceed according to the current local regulations, or take it to the dealer when purchasing a similar new
unit.
Under Article 13 Leg. Decree No. 151 of 25 July 2005 implementing Directive 2002/96/EC of 23 February 2003
on Waste Electrical and Electronic Equipment and procedures relating to measures aimed at preventing the
production of waste electrical and electronic equipment, called WEEE, promoting reuse, recycling and other
forms of recovery in order to reduce the amount to be sent for disposal and improving the operation of parties
participating in the life cycle of these products.
The barred waste bin symbol on the label indicates that, at the end of its service life, the unit must be collected
separately from other household waste.
1.10 Instructions for requesting assistance and replacement parts
To request any assistance and/or replacement parts, contact the dealer, area importer or the nearest authorised
service centre, clearly specifying the following: boiler model, serial number, date of purchase, list of replacement
parts, details of faults or malfunctioning.
- All operations on components must be carried out by authorised and/or qualified personnel.
- Make sure all electrical connections are disconnected and that the boiler is cold before any work
on it.
- Only use original replacement parts.

DOMUSFIRE C29 - C359
2 TRANSPORT AND INSTALLATION
2.1 Conditions of supply, transport and storage
The boiler is delivered wrapped in nylon protection and packed on a pallet + wooden crate after completing the
production cycle and the functional testing on the assembly line at the manufacturer's factory.
The unit complete with packing can be lifted using a lift truck, inserting the forks (of suitable length) in the special
spaces in the wooden pallet Make sure the equipment used for lifting and transport can take the boiler's weight,
specified on the data plate and in this manual.
Avoid taking the load in areas where it could be a danger if dropped.
- During transport and storage, avoid exposure to rain or persistent humidity.
- The boiler must only be moved in a vertical position by forklift, resting on the base.
- Use suitable equipment to remove the boards or wooden parts of the boiler packing.
- Disposal or recycling of the packing must be done by the end user, complying with local regulations on
waste and keeping it out of the reach of children or disabled persons.
2.2 Place of installation, positioning and fire-prevention safety
After preparing the water and electrical connections (by a qualified technician), open the packing, remove the boiler
from pallet and place it in the desired location, making sure it complies with the requirements in this manual.
Set the boiler down on the floor carefully without bumping and position it in the required place. Make sure the floor
can take its weight, otherwise see a specialised technician.
After removing the protective packing, be careful not to damage the mechanical and electrical parts by knocking or
splashing with water.
The place of installation must be sufficiently ventilated to allow the removal of any combustion smoke leaks.
The unit is suitable for operation in technical environments with min. temperature not below 0°C; it comes complete
with an antifreeze function that activates the heating pump for system water temperatures below 6°C, safeguarding:
heating chamber, heating/DHW circuit. The antifreeze function is active only when the boiler is electrically powered.
The boiler must also be suitably separated from flammable or combustible materials by air spaces or the use of
appropriate protective insulation; floors and/or ceiling-coverings in flammable or heat sensitive material must be
protected by panels of insulating material.
Make sure there are spaces at the sides and rear of the boiler, necessary for servicing and cleaning the unit, fume
ducts and the flue.
Also make sure the pellet hopper is easily accessible for loading the fuel.
The minimum distances for maintenance and safety must comply with the following table:
A= 500 mm
B= 500 mm
C= 500 mm
D
=
1000
mm
BOILER
OPTIONAL
SUPPLEMENTA
RY HOPPER
L= 1450 mm
P
=
700
mm

DOMUSFIRE C29 - C3510
The boiler is provided with 4 adjustable feet to facilitate positioning on not perfectly flat floors. To adjust the height,
tilt the boiler and turn the feet as required.
2.3 Air inlet
The boiler must have the combustion air needed to ensure proper operation, through external air inlets, and
specifically:
►
a wall air inlet of at least of 100 cm², communicating with the outside and suitably protected externally by a
grille, must be provided near the boiler;
►
or by connection directly to the outside with a suitable pipe of inside diameter 60mm and max. length 1.5 m
suitably protected at the end.
►
or through the room adjacent to that of installation provided the air is free to flow through permanent openings
communicating with the outside, meeting the requirements described above. The adjacent room must not be
subject to a lower pressure than the outside environment due to the draught effect created by the presence of
other possible units or suction devices. The adjacent room can not be used as a car garage, for storing
combustible material or for activities with fire risk.
The boiler air inlet connection or intake is located at the back and is round and 60 mm in diameter.
2.4 Fume exhaust
Fumes can be exhausted through a connection to an approved flue.
- The installer must check the efficiency and state of the flue and its conformity with the
local, national and European regulations.
- Only certified pipes and connections with adequate seals guaranteeing their tightness must be used.
- Flexible metal tubes or fibre cement pipes are prohibited.
- In case of fire, turn the boiler off, promptly call the fire department, and avoid continual attempts to
extinguish it.
Wall air inlet
min. 100 cm²
Antiwind
grille
Flue
Inspection door on
flue
T union with
inspection cap
Flue connection

DOMUSFIRE C29 - C3511
Canna
fumaria
Comignolo
antivento
Presad’aria
esterna
min.100cm
Camera
ispezionabile
Distanza min
ima
2
Raccordo
fumi
2.4.1 Types of installations
Listed below are definitions and requirements for correct installation of an
exhaust flue in accordance with Italian Standard UNI10683:
FLUE : a vertical duct for collecting and expelling, at an appropriate height
from ground, the fumes coming from a single unit and, where permitted,
more than one.
FLUE technical requirements :- it must be fumetight, isolated and
insulated depending on its use;
- it must have a mainly vertical path with axis deviation < 45°;
- it must be placed at a suitable distance from flammable materials by
means of insulation or air gap;
- it must preferably have a continuous, free and independent round internal
section;
- it is advisable for the flue to have an inspectionable chamber for the
collection of solid materials
- and any condensate, placed under the beginning of the fume duct.
FLUE CONNECTION or DUCT: duct or connection element between the
unit and flue for evacuation of fumes.
DUCT technical requirements: - it must not cross rooms where the installation of combustion units is not allowed;
- flexible metal tubes or fibre cement pipes are prohibited;
- the use of counter-sloping elements is prohibited;
- horizontal sections must have an upward slope of at least 3%;
- the length of the horizontal section must be minimal and not more than 3 m;
- there must not be more than 3 changes of direction without the T union;
- with change of direction > 90° a max. of 2 bends can be used with length in horizontal projection not exceeding 2 m.
- the fume duct must have a continuous section and allow the recovery of soot.
CHIMNEY CAP : a device placed on the top of the flue to facilitate the dispersion of fumes into the atmosphere.
CHIMNEY CAP technical requirements : - it must have a section equivalent to that of the flue;
- it must have a useful section not less than double the internal section of the flue;
- it must prevent the entry of rain and foreign bodies and ensure the discharge of fumes in any
atmospheric condition;
- it must ensure an adequate dilution of fumes and be positioned outside the backflow area;
- it must be without mechanical means of suction.
The direct discharge of fumes must take place on the roof and not towards closed spaces (even open air).
2.5 Turbulator and brazier position check
Before lighting the boiler, make sure the brazier is in the correct position, i.e. fitted in the special slots Also make
sure the turbulator shaker device is resting in the lower position. An incorrect position of the brazier and/or
turbulators can result in malfunctioning and excessive creation of dusts and unburnt products.
At every unit lighting, check the correct position of the brazier and turbulator shaker device.
2.6 Electrical connection
Connect one end of the power cable to the rear socket of the stove, and the other to a wall socket.
The voltage supplied by the system must match that specified on the stove data plate and in the technical data
section of this manual.
During stove idle periods it is advisable to remove the power cable.
- Make sure the electrical system complies with the regulations and has an earth connection and
differential switch in compliance with the current Standards
- The power cable must never touch the stove exhaust pipe.
Antiwind grille
Flue
Flue
connection
Inspectiona
ble chamber
Outside air inlet
min. 100 cm²
Min. distance 0.2m

DOMUSFIRE C29 - C3512
2.7 Wiring diagram
PELLET SAF.
FUMES
INT. AUGER
SUPPL. HOPPER AUGER
HEATING
P.
IGNITER
HEATING P. DOUBLE P
3
-WAY FOR DHW
DHW P. DOUBLE P.
H2O SAF.
FUME ENCODER
AIR FLOW METER
LOW
P.
O.C. DISPLAY
H2O PRESSURE
TRAN
SDUCER
EXT. THERM. *
EXT. THERM. *
FUME PROBE
PUFFER / STORAGE
TANK H2O PROBE
HEATING H2O PROBE
BOILER PELLET LEVEL
HOPPER PELLET
LEVEL *
FLOW SWITCH *

DOMUSFIRE C29 - C3513
2.8 Wiring diagram for zone system
Before installing the boiler in the home, check the type of heating system; if there are several zones, a special
electronic controller for multi-zone circuits, available as an optional, must be installed. This is to prevent overheating
of the unit due to possible simultaneous closing of the zone valves and consequent stopping of hot water delivery
flow.
2.9 Plumbing connections
The heating capacity of the unit must be previously established by calculating the building's heat requirement
according to current regulations, by contacting a specialised technician.
According to Italian Standard UNI 10412-2 (2009) and proper installation technique, a heating system must be
provided with all the adjustment, control and safety components to ensure proper and safe operation, as well as
shutoff and non-return valves to allow the boiler to be isolated from the system in case of maintenance and/or
checks.
There are two types of systems: CLOSED VESSEL system and OPEN VESSEL system. In the present case, both
types are compatible with our unit, provided all the adjustment, control and safety components required by the
current regulations on installation are installed.
The pellet boiler has an internal heating water circuit complete with circulating pump, safety valve, air vent,
temperature probes and pressure transducer.
If the heating system is managed in zones a multi-zone controller, available on request, must be installed.
In solid fuel boilers, to avoid the return of cold water in the heating chamber during the heating phase, it is advisable
to install an AUTOMATIC THERMOSTATIC VALVE (available on request) in the system to improve combustion
efficiency and boiler life and also reduce the condensation of fumes in the flueways, with less deposits and tars.
Before connecting the boiler to the water circuit, thoroughly clean all system pipes to remove any residuals or
machining residuals that could compromise the proper operation of the adjustment, control and safety components.
During boiler transport, the rings and respective seals in the water system may come loose and/or break,
causing water leaks during operation; therefore make sure to check the tightening of the circulating pump
and heating chamber connection rings and vent the residual air during water filling and after the first hours
of operation.
2.9.1 System water filling
After carrying out the plumbing connections, it is possible to FILL the unit and system:
- open all the air vent valves of the radiators - manifolds - boiler and system;
- open the water filling cock gradually, making sure the vent valves work properly;
- fill the system slowly, to allow proper and complete evacuation of the air from the vent, bringing the circuit under
pressure (for a closed vessel system from 1.1 to 1.5 bar);
- when finished, close the filling cock and make sure all vent valves have discharged the air from the system.
The creation of a heating system with installation of the boiler must comply with all the applicable
National, Regional, Provincial and Local regulations in the country where the system is installed.
2.9.2 System water characteristics
The chemical-physical characteristics of the system and replenishing water are important for the proper operation
and service life of the boiler; in fact, with the use of low quality water the most frequent problem is due to scale,
which causes a reduction in heat exchange and generates corrosion.
It is therefore advisable to check the water quality and, in the conditions listed below, provide for treatment: - very
hard water ( >20°f ),
- considerable amounts of replenishing water or subsequent fillings,
- systems of some complexity and size.
2.9.3 DHW system
To connect the boiler to a DHW system, it is advisable to see a qualified technician in order to
best optimise the plumbing connections and the performance of the entire system without compromising unit
functionality.
One of the following optionals must be requested for the connection to the DHW circuit:
- a DHW pump on the delivery manifold with respective connection pipes for placing inside the boiler.
- or a DHW pump, plate heat exchanger and connection pipes for placing inside the boiler.
- or a 3-way valve for installing outside the boiler.

DOMUSFIRE C29 - C3514
After completing the DHW connection it is necessary to access the technical menu of the controller and select the
type of circuit; every specific DHW function set: DHW EXCHANGER, ACCUMULATOR (PUFFER) or DHW
STORAGE TANK appears on the display at the moment of heating-DHW switchover with one of the messages given
below and remains until the end of the DHW request by the thermostat or flow switch :
2.9.4 Boiler hydraulic diagrams
Hydraulic diagram - Pellet boiler with pump
Pellet boiler
Control
system
IN
OUT Thermostat T>
85 °C
Pellet heating
chamber
A - DELIVERY Heating male 1”
B - RETURN Heating male 1”
C - DHW DELIVERY male 3/4"
D - DHW RETURN male 3/4"
E - Water supply F1/2”
F - Water overpressure discharge F1/2"
KEY:
Drain cock
Pressure gauge/pressure sensor
Circulating pump
Membrane expansion tank
Shutoff valve/cock
Non-return valve
Circuit/heating chamber air vent
Pressure relief valve P max 3 bar
Pressure relief valve P max 6 bar
Flow switch
Plate heat exchanger for DHW
Circuit balancing valves
Automatic thermostatic valve
Safety sensor T > 85 °C
Water temperature sensor
Circuit pressure sensor
Valves to be included in the system during
installation - not supplied with the unit

DOMUSFIRE C29 - C3515
2.10 Emergency
Suitable fire-prevention devices should be arranged for any eventuality.
In case of a fire, proceed as follows:
- Immediately disconnect the power plug;
- Extinguish the fire using suitable fire-extinguishers;
- Call the fire department immediately;
- Do not use jets of water to extinguish the fire.
Hydraulic diagram of pellet Boiler with DHW plate heat exchanger _07-2012
Pellet boiler
Control
system
IN
OUT Thermostat T>
85 °C
Pellet heating
chamber
A - DELIVERY Heating male 1”
C - DHW DELIVERY male 1/2"
B - RETURN DHW male 1”
E - Water supply F1/2”
F - Water overpressure discharge F1/2"
KEY:
Drain cock
Pressure gauge/pressure sensor
Circulating pump
Membrane expansion tank
Shutoff valve/cock
Non-return valve
Circuit/heating chamber vent
Pressure relief valve P max 3 bar
Pressure relief valve P max 6 bar
Flow switch
Plate heat exchanger for DHW
Circuit balancing valves
Automatic thermostatic valve
Safety sensor T > 85 °C
Water temperature sensor
Circuit pressure sensor
Valves to be included in the system during
installation - not supplied with the unit

DOMUSFIRE C29 - C3516
3 BOILER SAFETY
3.1 Safety distance from flammable materials
To prevent the risk of fire, unit positioning must respect a minimum distance from flammable materials, according to
that given in the technical table of the manual and on the data plate.
Pay attention to the type of floor and ceiling-covering in the place of installation: for delicate and flammable materials
it is advisable to use adequate thermal diaphragms or panels (see par. 2.2 ).
3.2 Fume exhaust safety
In normal operation the combustion chamber is in a negative pressure, guaranteeing seal against any smoke leaks
into the room. If a certain vacuum level is not reached or the fume exhaust outlet is blocked, the vacuum switch
detects the lack of a negative pressure inside the combustion chamber or the air flow meter detects a lack of
combustion air flow and, through the electronic controller, switches off the auger rotation motor, signalling the
anomaly with a message on the control panel 'AL8 NO NEG PRESS' or 'AL9 INSUF DRAUGHT'.
3.3 Combustion chamber overpressure safety
Any and/or sudden combustion fume overpressures inside the chamber and fume exhaust ducts are discharged by
opening of the safety valves located above the ash door. During normal operation these valves are kept closed by
their weight and the negative pressure in the combustion chamber, ensuring a seal against any smoke escaping.
Periodically check closing, the integrity of the device and its operation.
3.4 Overheating - safety thermostats
3.5 Safety against flare-back in the pellet chute
The solutions preventing flare-back are:
►
negative pressure in the combustion chamber see par. 3.2.
►
the siphon shape of the pellet chute.
►
the hopper temperature safety see par. 3.4.
3.6 Overcurrent protection device
The unit is protected against overcurrent by 2A fuse/s on the power supply of the main boiler switch located at the
back.
3.7 Water circuit overpressure safety
Any overpressure of the water inside the chamber, by P>3 bar, is discharged through activation of the safety valve
installed in the hydraulic system inside the stove.
Do not tamper with the safety devices.
3.8 Fume extractor fan failure
If the fume extractor fan stops for any reason, the electronic controller instantly stops the pellet supply, displaying the
message 'AL4 FAN FAIL'.
T1
T2
On the bottom of the hopper, and namely on the pellet chute and on the top part
of the heating chamber, there are two temperature probes connected to the
respective safety thermostats that automatically shut off the pellet supply in case
of excessive heating. In this case the extractor and/or fans continue working,
allowing the unit to cool down rapidly. The fault is displayed on the control panel
with the message 'AL 7 THERMAL SAF'. In case of activation, proceed as
follows:
►
Allow the boiler to cool down for at least 45 minutes.
►
Reset the thermostat by pressing the button near the switch behind the
boiler (figure opposite) after removing the protection, and namely:
T1 - heating chamber water temperature thermostat
T2 - pellet chute temperature thermostat
►
Restart the boiler normally.
Pellet hopper thermostat activation temperature: > 85°C
Heating chamber thermostat activation temperature: > 95°C

DOMUSFIRE C29 - C3517
4 BOILER USE
4.1 Introduction
The pellet boiler has the advantage of combining the heat generated by the combustion of wood with the
convenience of automatic water temperature management and the possibility of weekly programming of switching
on/off, as well as the connection of a thermostat and/or chronothermostat and start-stop remote control.
For safe and reliable use:
- when lighting and using the unit the first time, unpleasant odours may be created, therefore air the room
thoroughly;
- the hopper must only be filled with good quality pellets; make sure the bag does not come into contact with the
hot surfaces of the boiler;
- do not put any fuel other than the prescribed pellets in the hopper;
- the unit must not be used as a waste incinerator;
- the boiler must only operate with the fire door always closed.
- the fire and ash door seals must be checked periodically to prevent air from entering;
- to ensure thermal efficiency and correct operation it is necessary to clean the brazier every time pellets are
loaded;
- when lighting the boiler for the first time, allow it to heat up gradually by setting low operating temperatures (see
the section on temperature setting);
- during lighting, operation and shutdown, the boiler may creak a little due to the heat expansion.
4.2 Description of control panel
The control panel comprises a backlit LCD, on/off button 'P4’, SET/MENU button ‘P3’, four menu buttons 'P1’, ‘P2’,
‘P5’, ‘P6’, and seven boiler operation status LEDs.
The panel enables boiler lighting and shutdown, adjustment during operation and the setting of management and
maintenance programs.
The display shows all the information on boiler operation status.
To access the menus, proceed as follows:
- press the SET button ‘P3’;
- press the buttons ‘P5’, ‘P6’ to scroll the various menus;
- press one of the increase/decrease buttons ‘P1’, ‘P2’, to set the required parameter;
- press the SET button ‘P3’ to confirm the parameter value.
On accessing the menu it is possible to obtain the various types of displays and make settings, depending on the
access level.
Given below is the table of controls and respective messages displayed during programming or setting operation
parameters:
Backlit LCD
IR receiver
Status indicators
Setting buttons
Display indications
On - selection
button
Setting
and selection
buttons

DOMUSFIRE C29 - C3518
button description mode action top display bottom display limits
SET TEMPERATURE Increase the WATER AND AMBIENT
thermostat temperature value SET H2O/air Temperature
air 7°C ÷ 40
°C water
30°C ÷ 80
°C
PROGRAMMING Increase the selected parameter Selected
parameter Parameter value -
1 Increase
temperature
WORK Display temperatures Fume temperature Water temperature -
SET TEMPERATURE Decrease the water and ambient thermostat
temperature value SET H2O/air Temperature
air 7°C ÷ 40
°C water
30°C ÷ 80
°C
PROGRAMMING Decrease the selected parameter Selected
parameter Parameter value
2 Decrease
temperature
WORK Display stove operation status Pressure in water
circuit fume fan speed
3 Set/Menu - Access the SET temperature and the user
and technician parameters menu with
successive pressing SET/parameter Temperature/value
WORK Press for 2 seconds to turn the stove on or
off, if off or on respectively. Display current status
BLOCK Reset the stove, returning it to off status OFF
4 ON/OFF Reset
PROGRAMMING Use to exit the programming menu at any stage of the modification. Modifications are
saved.
5 Decrease power WORK/OFF Decrease the power or the DHW storage
tank water thermostat Temperature value (if
enabled) Power level SET DHW
temperature 1-5
6 Increase power WORK/OFF Increase the power or the DHW storage
tank water thermostat Temperature value (if
enabled) Power level SET DHW
temperature 1-5
The Figure opposite describes the meaning of the status
indicators in the left part of the display.
Activation of one of the segments on the display signals
activation of the corresponding device according to the
list opposite.
4.3 Lighting
4.3.1 Check before lighting
Before lighting the boiler:
- make sure to have read and understood the information given in the manual;
- the hopper must be filled with pellets;
- the combustion chamber must be clean;
- the brazier must be completely free, cleaned of any combustion residuals and correctly fitted in the brazier
holder;
- check hermetic closing of the ash box and fire door;
- check the connection of the power cable and switching to ON/1 of the switch located on the back of the boiler.
- check opening of the delivery and return shutoff valves as well as the water circuit pressure.
- At first startup, remove all the components that could burn (instructions/label) from the boiler firebox.
- Any lighting done after long idle periods requires the removal of any residual pellets that have remained
inside the hopper, in being damp fuel no longer suitable for combustion, and complete cleaning of the
combustion chamber.
External contact
Chrono
Heater
Auger
Fume extractor
DHW circuit activation
HEATING circuit activation
ALARM

DOMUSFIRE C29 - C3519
4.3.2 Startup stage
To light the boiler, press the button ‘P4’ for 3 seconds: the message ‘START’ will appear on the display.
This stage is automatic and managed entirely by the electronic controller without the possibility of changing the
parameters.
Alternatively the boiler can be lit by pressing the buttons P4 and P5 together for 3 seconds. The message
AWAITING REQUEST appears on the display. With this mode the boiler switches to standby status and carries out
the lighting-start stage only if a request for heat is recognised, e.g. to heat the water or for DHW (if available).
The boiler carries out the startup stages in sequence according to the procedures defined by the parameters that
manage levels and times, reaching the work condition unless anomalies or alarms occur, according to the following
table:
status duration devices conditions for going to next status
igniter Fume extr. auger exch.
OFF - OFF OFF OFF OFF ON/OFF
START - PREHEAT 40 sec. ON ON OFF OFF time elapsed 40 sec.
PELLET PRELOAD Pr40 ON ON ON OFF time elapsed Pr40
AWAITING FLAME Pr41 ON ON OFF OFF time elapsed Pr41
PELLET LOADING - ON ON ON OFF fume temperature > Pr13
FIRE PRESENT Pr02 OFF ON ON ON time elapsed Pr02
WORK - OFF ON ON ON ambient temperature < SET temperature fume temperature < Pr14
WORK MODULATE - OFF ON ON ON ambient temperature < SET temperature water temperature > water SET fume temperature < Pr14
BRAZIER CLEANING Pr12 OFF ON ON ON with frequency Pr03
WORK - OFF ON ON ON ON/OFF to switch off
FINAL CLEANING Pr39 (*) OFF ON OFF - (*) Pr39 starts when Tfumes < Pr13
After a certain time has elapsed, if the fume temperature has not reached the permissible minimum value the boiler
goes in alarm status.
- Do not use flammable liquids to light the unit.
- In case of persistent failed lighting, contact the Service Centre.
Clock
Dialogue box
Water temperature
Storage tank-Puffer H 2 0
temperature
Button ‘P4’

DOMUSFIRE C29 - C3520
4.4 Work stage
After the 'STARTUP' stage, the boiler goes to the 'WORK' mode which is the normal operation mode.
The user can adjust the heating power from the max. value of 5 to a min. of 1 with the buttons ‘P5’ and ‘P6’.
DHW circuit function activation ON is displayed by the segment/LED [A].
- Make sure to check the pellet level in the hopper so that the flame does not go out due to lack of
pellets.
- Make sure the unit is off when loading pellets.
- The pellet hopper lid must always remain closed; it must only be opened when loading fuel.
- The bags of pellets must be kept at least 1.5 m from the boiler.
4.4.1 Modifying the water temperature setting
To modify the water temperature just select the MENU’ 03 mode by
pressing the button P3.
Then use the buttons ‘P1’ and ‘P2’to enter MENU’ M 3-6 and to set
the desired temperature .
When the water temperature has reached the set value or the
fume temperature has reached the set max. value, the power is
automatically brought to the min. value, MODULATION status.
When the fume temperature reaches a set max. value the message 'MODULATE F' appears on the control panel and
the stove activates the flame modulation procedure without any user intervention, whereas if the temperature exceeds
280°C the alarm 'AL3 HOT FUMES' appears and the boiler activates the shutdown procedure.
4.4.2 Restart from STANDBY
With activation of the STANDBY function and
ambient or Puffer thermostat, at the end of shutdown the boiler
goes to cooling status, bringing the fume extractor speed to the set
value for brazier cleaning. Relighting occurs as soon as the water
temperature reaches the SET value.
4.4.3 Cleaning the brazier
During normal operation in work mode, the 'BRAZIER CLEANING'
mode is activated at parameter-fixed intervals for a set duration.
Clock
Storage tank or
Puffer H20
temperature
Dialogue box
Water temperature
Button ‘P6’
Button ‘P5’
Real power in work equal to
1
- flashing
Power set to
3
A
Set power
Heating chamber water