Immergas Maior Eolo 24 4E Product manual

MAIOR EOLO
24-28-32 4E
Instruction and
warning booklet
IE
*1.038771ENG*

Dear Customer,
Our compliments for having chosen a top-quality Immergas product, able to assure well-being and safety for a long period of time. As an Immergas customer
you can also count on a qualied aer-sales service, prepared and updated to guarantee constant eciency of your boiler. Read the following pages carefully: you
will be able to draw useful suggestions regarding the correct use of the appliance, the respect of which, will conrm your satisfaction for the Immergas product.
Contact our area authorised aer-sales centre as soon as possible to request commissioning. Our technician will verify the correct functioning conditions; he
will perform the necessary calibrations and will demonstrate the correct use of the generator.
For assistance and scheduled maintenance contact Authorised Immergas Aer-Sales centres: they have original spare parts and are specically trained directly
by the manufacturer.
General recommendations
All Immergas products are protected with suitable transport packaging.
e material must be stored in dry environments protected against bad weather.
e instruction book is an integral and essential part of the product and must be consigned to the new user also in the case of transfer or succession of ownership.
It must be stored with care and consulted carefully, as all of the warnings provide important safety indications for installation, use and maintenance stages.
is instructions manual provides technical information for installing Immergas boilers. As for the other issues related to boiler installation (e.g. safety in the work
site, environment protection, injury prevention), it is necessary to comply with the provisions specied in the regulations in force and principles of good practice.
In compliance with legislation in force, the systems must be designed by qualied professionals, within the dimensional limits established by the Law. Installation
and maintenance must be performed in compliance with the regulations in force, according to the manufacturer's instructions and by professionally qualied
sta, intending sta with specic technical skills in the plant sector, as envisioned by the Law.
Improper installation or assembly of the Immergas appliance and/or components, accessories, kit and devices can cause unexpected problems to people, animals
and objects. Read the instructions provided with the product carefully to ensure a proper installation.
Maintenance must be carried out by skilled technical sta. e Immergas Authorised Aer-sales Service represents a guarantee of qualications and
professionalism.
e appliance must only be destined for the use for which it has been expressly declared. Any other use will be considered improper and therefore potentially
dangerous.
If errors occur during installation, operation and maintenance, due to non compliance with technical laws in force, standards or instructions contained in this
book (or however supplied by the manufacturer), the manufacturer is excluded from any contractual and extra-contractual liability for any damages and the
appliance warranty is invalidated.
For further information regarding legislative and statutory provisions relative to the installation of gas heat generators, consult the Immergas site at the
following address: www.immergas.com

INDICE
USER pag.
Immergas S.p.A. declines all liability due to printing or transcription errors, reserving the right to make any modications to its technical and commercial
documents without forewarning.
INSTALLATOR pag. MAINTENANCE TECHNICIAN page
1 Boiler installation......................................5
1.1 Installation recommendations.................5
1.2 Main dimensions.......................................6
1.3 Anti-freeze protection. .............................6
1.4 Connections...............................................7
1.5 Remote controls and room chrono-
thermostats (optional)..............................8
1.6 External probe (optional).........................8
1.7 Immergas ue systems..............................9
1.8 Outdoor installation in partially protected
area..............................................................9
1.9 Indoor installation. .................................13
1.10 Flue exhaust to ue/chimney.................17
1.11 Ducting of existing ues.........................17
1.12 Flues, chimneys and chimney caps.......17
1.13 System lling............................................17
1.14 Gas system start-up.................................17
1.15 Boiler start-up (ignition)........................17
1.16 Circulation pump....................................18
1.17 Kits available on request.........................19
1.18 Boiler components..................................19
2 Instructions for use and maintenance..20
2.1 Cleaning and maintenance. ...................20
2.2 General warnings....................................20
2.3 Control panel...........................................20
2.4 Using the boiler........................................21
2.5 Troubleshooting. .....................................21
2.6 Boiler shutdown ......................................22
2.7 Restore central heating
system pressure........................................22
2.8 System draining.......................................22
2.9 Anti-freeze protection. ...........................22
2.10 Case cleaning...........................................22
2.11 Decommissioning...................................22
3 Boiler start-up
(initial check)...........................................23
3.1 Hydraulic diagram. .................................23
3.2 Wiring diagram.......................................24
3.3 Troubleshooting. .....................................24
3.4 Information menu...................................25
3.5 Programming the p.C.B. ........................25
3.6 Converting the boiler to other types of
gas..............................................................27
3.7 Checks following conversion to another
type of gas.................................................27
3.8 Possible adjustments...............................27
3.9 Slow automatic ignition function..........27
3.10 “Chimney sweep” function. ...................28
3.11 Pump anti-block function......................28
3.12 ree-way anti-block function..............28
3.13 Radiators anti-freeze function...............28
3.14 P.C.B. Periodical self-check....................28
3.15 Solar panels coupling function..............28
3.16 Yearly appliance check and
maintenance.............................................28
3.17 Casing removal........................................29
3.18 Variable heat output................................31
3.19 Combustion parameters.........................32
3.20 Technical data..........................................33
3.21 Data plate key...........................................34

5
1-1
INSTALLERUSER
MAINTENANCE TECHNICIAN
YES NO
1BOILER INSTALLATION
1.1 INSTALLATION
RECOMMENDATIONS.
e Maior Eolo boiler has been designed for wall
mounted installation; they must be used to heat
environments, to produce domestic hot water
and similar purposes.
e place of installation of the appliance and
relative Immergas accessories must have suitable
features (technical and structural) such to allow
(always in safety, efficiency and comfortable
conditions):
- installation (according to the provisions of the
technical legislation and technical regulations);
- maintenance operations (including scheduled,
periodic, routine and special maintenance);
- removal (to outdoors in the place for
loading and transporting the appliances
and components) as well as their eventual
replacement with appliances and/or equivalent
components.
In the case of wall installation the wall surface
must be smooth, without any protrusions or
recesses enabling access to the rear part. ey
are NOT designed to be installed on plinths or
oors (Fig. 1-1).
By varying the type of installation the classica-
tion of the boiler also varies, precisely:
- Boiler type B22 if installed without the 2 intake
caps and with the top cover kit.
- Type C boiler if installed using concentric pipes
or other types of pipes envisioned for the sealed
chamber boiler for intake of air and expulsion
of ue gas.
Only professionally qualied heating/plumbing
technicians are authorised to install Immergas
gas appliances. Installation must be carried out
according to the standards, current legislation
and in compliance with local technical regula-
tions and the required technical procedures. In-
stallation of the Maior Eolo boiler when powered
by LPG must comply with the rules regarding
gases with a greater density than air (remember,
as an example, that it is prohibited to install sy-
stems powered with the above-mentioned gas in
rooms where the oor is at a lower quota that the
average external country one). Before installing
the appliance, ensure that it is delivered in per-
fect condition; if in doubt, contact the supplier
immediately. Packing materials (staples, nails,
plastic bags, polystyrene foam, etc.) constitute
a hazard and must be kept out of the reach of
children. If the appliance is installed inside or
between cabinets, ensure sufficient space for
normal servicing; therefore it is advisable to
leave clearance of at least 3 cm between the boiler
casing and the vertical sides of the cabinet. Leave
adequate space above the boiler for possible water
and ue removal connections.
Keep all ammable objects away from the ap-
pliance (paper, rags, plastic, polystyrene, etc.).
Do not place household appliances underneath
the boiler as they could be damaged if the safety
valve intervenes (if not conveyed away by a
discharge funnel), or if there are leaks from the
connections; on the contrary, the manufacturer
cannot be held responsible for any damage cau-
sed to the household appliances.
In the event of malfunctions, faults or incorrect
operation, turn the appliance o immediately
and contact a qualified technician (e.g. the
Immergas Aer-Sales Assistance centre, which
has specically trained sta and original spare
parts). Do not attempt to modify or repair the
appliance alone. Failure to comply with the above
implies personal responsibility and invalidates
the warranty.
• Installation regulations:
- this boiler can be installed outdoors in a
partially protected area. A partially protected
location is one in which the appliance is not
exposed to the direct action of the weather
(rain, snow, hail, etc..).
- Installation in places with a fire risk is
prohibited (for example: garages, box), gas
appliances and relative ue ducts, ue exhaust
pipes and combustion air intake pipes.
- Installation is also prohibited in places/en-
vironments that constitute common parts of
oce condominiums such as stairs, cellars,
entrance halls, attics, los, escape routes,
etc. if they are not located inside technical
compartments under the responsibility of
each individual building and only accessible
to the user (technical compartments and the
appliances must be realised and installed in
compliance with re prevention Standards).
Important: Wall mounting of the boiler must
guarantee stable and ecient support for the
generator.
e plugs (standard supply) are to be used only in
conjunction with the mounting brackets or xing
template to x the appliance to the wall; they only
ensure adequate support if inserted correctly
(according to technical standards) in walls made
of solid or semi-hollow brick or block. In the
case of walls made from hollow brick or block,
partitions with limited static properties, or in any
case walls other than those indicated, a static test
must be carried out to ensure adequate support.
N.B.: the hex head screws supplied in the blister
pack are to be used exclusively to x the relative
mounting bracket to the wall.
ese boilers are used to heat water to below
boiling temperature in atmospheric pressure.
ey must be attached to a heating system sui-
table for their capacity and voltage.

6
1-2
INSTALLERUSER
MAINTENANCE TECHNICIAN
1.3 ANTIFREEZE PROTECTION.
Minimum temperature -5°C. e boiler is sup-
plied with an antifreeze function as standard that
activates the pump and burner when the system
water temperature in the boiler falls below 4°C.
e anti-freeze function is only guaranteed if:
- the boiler is correctly connected to gas and
electricity power supply circuits;
- the boiler is powered constantly;
- the boiler is not in “O ” mode;
- the boiler is not in no ignition block (Par.2.5);
- the boiler essential components are not faulty.
In these conditions the boiler is protected against
freezing to an environmental temperature of -5°C.
Minimum temperature -15°C. If the boiler is
installed in a place where the temperature falls
below -5°C, and in the event there is no gas (or
the boiler goes into ignition block), the appliance
can freeze.
To prevent the risk of freezing follow the instruc-
tions below:
- Protect the heating circuit from freezing by
adding a high quality anti-freeze liquid that is
not considered a health hazard. It is necessary
to carefully follow manufacturer instructions
regarding this liquid when considering the
percentage necessary that depends on the mini-
mum temperature the system is to be protected
from. An aqueous solution must be prepared
with a potential water pollution potential of 2
(EN 1717:2002).
e materials that Immergas boilers are made
from are resistant to ethylene and propylene glycol-
based anti-freeze liquids (If the mixtures have been
prepared according to industry standards).
For life and possible disposal, follow the supplier’s
instructions.
- Protect the domestic hot water circuit against
freezing by using an accessory that is supplied
on request (anti-freeze kit) comprising two
electric heating elements, the relevant cables
and a control thermostat (carefully read the
installation instructions contained in the ac-
cessory kit pack).
Boiler anti-freeze protection is thus ensured only if:
- the boiler is correctly connected to electricity
power supply circuits;
- main switch is inserted;
- the anti-freeze kit components are ecient.
In these conditions the boiler is protected against
freezing to temperature of -15°C.
e warranty does not cover damage due to inter-
ruption of the electrical power supply and failure
to comply with that stated on the previous page.
N.B.: if the boiler is installed in places where
the temperature falls below 0°C, the heating
attachment pipes must be insulated.
1.2 MAIN DIMENSIONS.
Height
(mm)
Width
(mm)
Depth
(mm)
781 440 340
CONNECTIONS
GAS DOMESTIC
HOT WATER SYSTEM
GAC AF R M
3/4” 1/2” 1/2” 3/4” 3/4”
Key:
G - Gas supply
AC - Domestic hot water outlet
ACV - Solar valve kit DHW inlet
(Optional)
AF - Domestic cold water inlet
R - System return
M - System ow
V - Electrical connection
N.B.: connection group (optional)

7
INSTALLERUSER
MAINTENANCE TECHNICIAN
1.4 CONNECTIONS.
Gas connection (Appliance category II2H3+).
Our boilers are designed to operate with methane
gas (G20) and LPG. Supply pipes must be the
same as or larger than the 3/4”G boiler tting.
Before connecting the gas line, carefully clean
inside all the fuel feed system pipes to remove any
residue that could impair boiler eciency. Also
make sure the gas corresponds to that for which
the boiler is prepared (see boiler data-plate). If
dierent, the appliance must be converted for
operation with the other type of gas (see conver-
ting appliance for other gas types). e dynamic
gas supply (methane or LPG) pressure must also
be checked according to the type used in the
boiler, as insucient levels can reduce generator
output and cause malfunctions.
Ensure correct gas cock connection. e gas
supply pipe must be suitably dimensioned accor-
ding to current regulations in order to guarantee
correct gas ow to the burner even in conditions
of maximum generator output and to guarantee
appliance eciency (technical specications).
e coupling system must conform to standards.
Fuel gas quality. e appliance has been desig-
ned to operate with gas free of impurities; other-
wise it is advisable to t special lters upstream
from the appliance to restore the purity of the gas.
Storage tanks (in case of supply from LPG
depot).
- New LPG storage tanks may contain residual
inert gases (nitrogen) that degrade the mixture
delivered to the appliance casing functioning
anomalies.
- Due to the composition of the LPG mixture,
layering of the mixture components may occur
during the period of storage in the tanks. is
can cause a variation in the heating power of
the mixture delivered to the appliance, with
subsequent change in its performance.
Hydraulic connection.
Important: In order not to void the warranty
before making the boiler connections, carefully
clean the heating system (pipes, radiators, etc.)
with special pickling or de-scaling products to
remove any deposits that could compromise
correct boiler operation.
In compliance with Standards in force it is man-
datory to treat the water in the heating system
chemically in order to protect the system and
appliance from deposits of lime scale.
Hydraulic connections must be made in a
rational way using the couplings on the boiler
template. e boiler safety valves outlet must be
connected to a draining funnel. Otherwise, the
manufacturer declines any responsibility in case
of ooding if the drain valve cuts in.
In order to meet the system requirements
established by the regulations in terms of
pollution of drinking water, we recommend
installing the IMMERGAS anti-backow kit to be
used upstream of the cold water inlet connection
of the boiler. It is also recommended that the heat
transfer uid (e.g. water + glycol) entered in the
primary circuit of the boiler (heating circuit),
complies with the local regulations in force.
Important: to preserve the duration of appliance
eciency features, in the presence of water whose
features can lead to the deposit of lime scale,
installation of the “polyphosphate dispenser” kit
is recommended.
Electrical connection: e “Maior Eolo” boiler
has an IPX5D protection rating for the entire
appliance. Electrical safety of the unit is reached
when it is correctly connected to an ecient
earthing system as specied by current safety
standards.
Important: Immergas S.p.A. declines any
responsibility for damage or physical injury
caused by failure to connect the boiler to an
ecient earth system or failure to comply with
the reference standards.
Also ensure that the electrical installation corre-
sponds to maximum absorbed power specications
as shown on the boiler data-plate. Boilers are sup-
plied complete with an “X” type power cable without
plug. e power supply cable must be connected to
a 230V ±10% / 50Hz mains supply respecting L-N
polarity and earth connection . is network
must also have a multi-pole circuit breaker with
class III over-voltage category. When replacing the
power supply cable, contact a qualied technician
(e.g. the Immergas Aer-Sales Technical Assistance
Service). e power cable must be laid as shown.
In the event of mains fuses replacement on the
connection board, use a 3.15A quick-blow fuses.
For the main power supply to the appliance,
never use adapters, multiple sockets or exten-
sion leads.

8
45
31
58
1-3
1-5
1-4
INSTALLERUSER
MAINTENANCE TECHNICIAN
On/O digital timer thermostat
Comando Amico Remoto remote controlV2 (CARV2)
Position of the central
heating temperature user adjustment
Comando Amico Remoto remote controlV2or
On/Off chrono-thermostat electrical con-
nections (Optional). e operations described
below must be performed aer having removed
the voltage from the appliance. Any thermostat
or On/O environment chrono-thermostat must
be connected to clamps 40 and 41 eliminating
jumper X40 (Fig. 3-2). Make sure that the On/
O thermostat contact is of the “clean” type, i.e.
independent of the mains supply, otherwise the
electronic adjustment card would be damaged.
Any Comando Amico Remoto remote controlV2
must be connected to clamps 41 and 44 elimi-
nating jumper X40 on the circuit board, paying
attention not to invert the connections (Fig. 3-2).
Important: if the Comando Amico Remoto
remote controlV2 or any other On/O chrono-
thermostat is used arrange two separate lines in
compliance with current regulations regarding
electrical systems. No boiler pipes must ever be
used to earth the electric system or telephone li-
nes. Ensure elimination of this risk before making
the boiler electrical connections.
1.6 EXTERNAL PROBE OPTIONAL.
e boiler is prepared for the application of the
external probe (Fig. 1-4), which is available as
an optional kit.
e probe can be connected directly to the boiler
electrical system and allows the max. system
ow temperature to be automatically decreased
when the external temperature increases, in
order to adjust the heat supplied to the system
according to the change in external temperature.
e external probe always acts when connected
independently from the presence or type of room
thermostat used. e correlation between system
ow temperature and external temperature is de-
termined by the position of the selector switch on
the boiler control panel according to the curves
shown in the diagram (Fig. 1-5). e electric con-
nection of the external probe must be made on
clamps 38 and 39 on the boiler P.C.B. (Fig. 3-2).
1.5 REMOTE CONTROLS AND
ROOM CHRONOTHERMOSTATS
OPTIONAL.
e boiler is prepared for the application of room
chrono-thermostats or remote controls, which
are available as optional kits. (Fig. 1-3)
All Immergas chrono-thermostats are connected
with 2 wires only. Carefully read the user and
assembly instructions contained in the acces-
sory kit.
• On/O digital chrono-thermostat. e chrono-
thermostat allows:
- to set two room temperature values: one for
day (comfort temperature) and one for night
(lower temperature);
- to set up to four on/o dierential weekly
programs;
- to select the required operating mode from
the various possible alternatives:
• permanent functioning in comfort temp;
• permanent functioning in reduced temp;
• permanent functioning in adjustable anti-
freeze temp.
e chrono-thermostat is powered by two 1.5V
LR 6 type alkaline batteries.
• Comando Amico Remoto Remote Control De-
viceV2 (CARV2) with climate chrono-thermostat
function. In addition to the functions described
in the previous point, the CAR panelV2 enables
the user to control all the important infor-
mation regarding operation of the appliance
and the heating system with the opportunity
of easily intervening on the previously set
parameters without having to go to the place
where the appliance is installed. e panel is
provided with self-diagnosis to display any
boiler functioning anomalies. e climate chro-
no-thermostat incorporated into the remote
panel enables the system ow temperature to
be adjusted to the actual needs of the room
being heated, in order to obtain the desired
room temperature with extreme precision and
therefore with evident saving in running costs.
e chrono-thermostat is fed directly by the
boiler by means of the same 2wires used for
the transmission of data between boiler and
chrono-thermostat.
Important: if the system is subdivided into zones
using the relevant kit. the CARV2 must be used
with its climate thermostat function disabled, i.e.
it must be set to On/O mode.

9
1-6 1-7
INSTALLERUSER
MAINTENANCE TECHNICIAN
1.7 IMMERGAS FLUE SYSTEMS.
Immergas supplies various solutions separately
from the boiler regarding the installation of air
intake terminals and ue extraction, which are
fundamental for boiler operation.
Important: e boiler must only be installed
together with an original Immergas air intake
and ue gas exhaust system. is system can be
identied by an identication mark and special
distinctive marking bearing the note: “not for
condensing boilers”.
e ue exhaust pipes must not be in contact with
or be near to ammable materials. Moreover,
they must not pass through buildings or walls
made of ammable material.
See following paragraphs for the detailed descrip-
tion of the kits available.
Positioning of double lip seals. For correct
positioning of lip seals on elbows and extensions,
follow the direction of assembly given in gure
(Fig. 1-6).
• Resistance factors and equivalent lengths. Each
ue extraction system component has a Resi-
stance Factor based on experimental tests and
specied in the table below. e resistance factor
for individual components is independent from
the type of boiler on which it is installed or the
actual dimensions. It is, however, conditioned
by the temperature of the uids that pass throu-
gh the pipe and therefore varies according to
applications for air intake or ue exhaust. Each
single component has a resistance corresponding
to a certain length in metres of pipe of the same
diameter; the so-called equivalent length, obtained
from the ration between the relative Resistance
Factors. All boilers have an experimentally obtaina-
ble maximum Resistance Factor equal to 100. e
maximum Resistance Factor allowed corresponds
to the resistance encountered with the maximum
allowed pipe length for each type of Terminal
Kit. is information enables calculations to be
made in order to verify the possibility of various
congurations of ue extraction systems.
1.8 OUTDOOR INSTALLATION IN
PARTIALLY PROTECTED AREA.
N.B.: a partially protected area is one in which the
appliance is not exposed to the direct action of the
weather (rain, snow, hail, etc..).
• Conguration type B, open chamber and fan
assisted.
The relevant terminal must be used for this
conguration (present in the intake kit for the
installation in question), which must be placed
on the central hole of the boiler (Fig. 1-9). Air
intake takes place directly from the environment
in which the boiler is installed and ue exhaust
in individual ue or to the outside.
In this conguration the boiler is classied as
type B22.
With this conguration:
- air intake takes place directly from the envi-
ronment in which the boiler is installed and
only functions in permanently ventilated
rooms;
- the ue exhaust must be connected to its own
individual ue or channelled directly into the
external atmosphere.
The technical regulations in force must be
respected.
Flue gas separator adjustment. For correct
functioning of the boiler in conguration with
direct intake it is necessary to regulate the ue
gas shutter according to that stated in the relative
tables (Fig. 1-11).
• Cover kit assembly (Fig. 1-8). Remove the
two plugs and the gaskets present from the two
lateral holes with respect to the central one. Now
cover the right intake hole using the relevant
plate, xing it onto the le side using the two
supplied screws. Install the Ø80 outlet ange on
the central hole of the boiler, taking care to insert
the gasket supplied with the kit and tighten by
means of the screws provided. Install the upper
cover, xing it using the 4 screws present in the
kit, positioning the relevant gaskets. Engage the
90° Ø80 bend with the male end (smooth) in
the female end (with lip seal) of the Ø80 ange
unit until it stops. Introduce the gasket, making
it run along the bend. Fix it using the sheet steel
plate and tighten by means of the straps present
in the kit, making sure to block the 4 gasket
aps. Fit the male end (smooth) of the exhaust
terminal into the female end of the bend 90°
Ø80, making sure that the relevant wall sealing
plate is already tted; this will ensure hold and
joining of the elements making up the kit.
• Coupling of extension pipes. To install push-
tting extensions with other elements of the
ue extraction elements assembly, proceed as
follows: Install the pipe or elbow with the male
side (smooth) in the female section (with lip
seal) to the stop on the previously installed
element. is will ensure sealing eciency of
the coupling.
Max. length of exhaust duct. The flue pipe
(vertical or horizontal) can be extended to a
max. length of 12 m straight route, using insulated
pipes (Fig. 1-28). To prevent problems of ue gas
condensate in the exhaust pipe Ø80, due to ue
gas cooling through the wall, the length of the
pipe (not insulated) must be limited to just 5 m.
Example of installation with direct vertical
terminal in partially protected location. When
the vertical terminal for direct discharge of com-
bustion products is used, a minimum gap of 300
mm must be le between the terminal and the
balcony above. e height A + B (always with
respect to the balcony above), must be equal to
or greater than 2000 mm. (Fig. 1-10).
• Configuration without cover kit (boiler
typeC).
By leaving the side plugs tted, it is possible to
install the appliance externally, in partially co-
vered places, without the cover kit. Installation
takes place using the Ø60/100 and Ø80/125
concentric horizontal intake/ exhaust kits. Refer
to the paragraph relative to indoor installation.
In this conguration the top cover kit guarantees
additional protection for the boiler. It is recom-
mended but not compulsory.

10
1-9
1-10
1-8
1-11
1-12
INSTALLERUSER
MAINTENANCE TECHNICIAN
VERTICAL TERMINAL KIT
FOR DIRECT DRAINING
INTAKE
COVER KIT DIAPHRAGM
Flue gas separator adjustment. For correct fun-
ctioning of the boiler it is necessary to regulate
the ue gas shutter positioned on the air/ue gas
sample points (Fig. 1-11).
Adjustment is carried out by loosening the
front retainer screw and moving the indicator
to the correct position, aligning its value to the
horizontal reference. Once adjustment has been
performed, tighten the screw to x the separator.
Appropriate adjustment takes place on the basis
of the type of pipe and its extension: this calcula-
tion can be carried out using the relevant tables.
Intake diaphragm installation. For correct boi-
ler functioning with Ø80 separator kits and drain
measuring > 1 m a diaphragm must be installed
on the sealed chamber intake hole and before
the intake pipe (Fig. 1-12). e choice of suitable
diaphragm takes place on the basis of the type of
pipe and its maximum extension: this calculation
can be carried out using the following tables:
N.B.: the diaphragms are supplied together with
the boiler.
e cover kit includes:
N° 1 Heat moulded cover
N° 1 Gasket clamping plate
N° 1 Gasket
N° 1 Gasket clamp
N° 1 N°1 Intake hole covering
plate
e terminal kit includes:
N° 1 Gasket
N° 1 Exhaust ange Ø80
N° 1 Bend 90° Ø80
N° 1 Exhaust pipe Ø80
N° 1 Wall sealing plate

11
INSTALLERUSER
MAINTENANCE TECHNICIAN
Shutter regulation table
Maior Eolo 24 4E.
Shutter regulation table
Maior Eolo 28 4E.
Shutter regulation table
Maior Eolo 32 4E.
Flue gas shutter notch
Type of installation
(duct length in metres)
1 3 4 5 6 10
Ø60/100 horizontal concentric kit - - Da 0 a 0,5 Da 0,5 a 1,5 - Da 1,5 a 3,0
Ø60/100 vertical concentric kit - - Da 0 a 2,2 Da 2,2 a 3,7 - Da 3,7 a 4,7
Ø80/125 horizontal concentric kit - - Da 0 a 0,5 Da 0,5 a 4,6 - Da 4,6 a 7,4
Ø80/125 vertical concentric kit - - Da 0 a 5,4 Da 5,4 a 9,5 - Da 9,5 a 12,2
Ø80 vertical separator kit without bends *Da 0 a 20 *Da 20 a 40 **Da 0 a 22 - - **Da 22 a 32
Ø80 horizontal separator kit with two bend *Da 0 a 16 *Da 16 a 35 **Da 0 a 17 - - **Da 17 a 28
Direct intake kit and Ø80 drain in B22 conguration - - Da 0 a 1 - Da 1 a 12 -
* ese maximum extension values are considered intake with 1 metre drain pipe
** ese maximum extension values are considered in draining with 1 metre intake pipe and Ø44 diaphragm on the intake hole.
Type of installation
(duct length in metres)
2 4 7 10
Ø60/100 horizontal concentric kit - Da 0 a 0,5 Da 0,5 a 1,5 Da 1,5 a 3,0
Ø60/100 vertical concentric kit - Da 0 a 2,2 Da 2,2 a 3,7 Da 3,7 a 4,7
Ø80/125 horizontal concentric kit - Da 0 a 0,5 Da 0,5 a 4,6 Da 4,6 a 7,4
Ø80/125 vertical concentric kit - Da 0 a 5,4 Da 5,4 a 9,5 Da 9,5 a 12,2
Ø80 vertical separator kit without bends *Da 0 a 20 *Da 20 a 40 **Da 0 a 22 ** Da 22 a 32
Ø80 horizontal separator kit with two bend *Da 0 a 16 *Da 16 a 35 **Da 0 a 17 ** Da 17 a 28
Direct intake kit and Ø80 drain in B22 conguration Da 0 a 1 - Da 1 a 12 -
* ese maximum extension values are considered intake with 1 metre drain pipe
** ese maximum extension values are considered in draining with 1 metre intake pipe and Ø 50 diaphragm on the intake hole.
Type of installation
(duct length in metres)
3 4 5 6 10
Ø60/100 horizontal concentric kit - - Da 0 a 0,5 Da 0,5 a 1,5 Da 1,5 a 3,0
Ø60/100 vertical concentric kit - - Da 0 a 2,2 Da 2,2 a 3,7 Da 3,7 a 4,7
Ø80/125 horizontal concentric kit - - Da 0 a 0,5 Da 0,5 a 4,6 Da 4,6 a 7,4
Ø80/125 vertical concentric kit - - Da 0 a 5,4 Da 5,4 a 9,5 Da 9,5 a 12,2
Ø80 vertical separator kit without bends *Da 0 a 20 *Da 20 a 40 **Da 0 a 22 - **Da 22 a 32
Ø80 horizontal separator kit with two bend *Da 0 a 16 *Da 16 a 35 **Da 0 a 17 - **Da 17 a 28
Direct intake kit and Ø80 drain in B22 conguration - Da 0 a 1 - Da 1 a 12 -
* ese maximum extension values are considered intake with 1 metre drain pipe
** ese maximum extension values are considered in draining with 1 metre intake pipe and Ø 50 diaphragm on the intake hole.

12
INSTALLERUSER
MAINTENANCE TECHNICIAN
DUCT TYPE
Resistance
Factor
(R)
Equivalent
length in m of concentric
pipe Ø 60/100
Equivalent
length in m of concentric
pipe Ø 80/125
Equivalent
length
in m of pipe Ø 80
Concentric pipe Ø 60/100 m 1 Intake and
Exhaust 16,5 m 1 m 2,8 Intake m 7,1
Exhaust m 5,5
Concentric bend 90° Ø 60/100 Intake and
Exhaust 21 m 1,3 m 3,5 Intake m 9,1
Exhaust m 7,0
Concentric bend Ø 60/100 Intake and
Exhaust 16,5 m 1 m 2,8 Intake m 7,1
Exhaust m 5,5
Terminal complete with concentric
horizontal intake-exhaust
Ø 60/100 Intake and
Exhaust 46 m 2,8 m 7,6
Intake m 20
Exhaust m 15
Terminal complete with concentric
horizontal intake-exhaust Ø 60/100 Intake and
Exhaust 32 m 1,9 m 5,3 Intake m 14
Exhaust m 10,6
Terminal complete with concentric vertical
intake-exhaust
Ø 60/100 Intake and
Exhaust 41,7 m 2,5 m 7
Intake m 18
Exhaust 14
Concentric pipe Ø 80/125 m 1 Intake and
Exhaust 6 m 0,4 m 1,0 Intake m 2,6
Exhaust m 2,0
Concentric bend Ø 80/125 Intake and
Exhaust 7,5 m 0,5 m 1,3 Intake m 3,3
Exhaust m 2,5
Concentric bend Ø 80/125 Intake and
Exhaust 6 m 0,4 m 1,0 Intake m 2,6
Exhaust m 2,0
Terminal complete with concentric vertical
intake-exhaust
Ø 80/125 Intake and
Exhaust 33 m 2,0 m 5,5
Intake m 14,3
Exhaust m 11,0
Terminal complete with concentric vertical
intake-exhaust Ø 80/125 Intake and
Exhaust 26,5 m 1,6 m 4,4
Intake m 11,5
Exhaust m 8,8
Terminal complete with concentric
horizontal intake-exhaust
Ø 80/125 Intake and
Exhaust 39 m 2,3 m 6,5
Intake m 16,9
Exhaust m 13
Terminal complete with horizontal
intake-exhaust Ø 80/125 Intake and
Exhaust 34 m 2,0 m 5,6
Intake m 14,8
Exhaust m 11,3
Concentric adapter from Ø 60/100
to Ø 80/125 with condensate trap Intake and
Exhaust 13 m 0,8 m 2,2 Intake m 5,6
Exhaust m 4,3
Concentric adapter from
Ø 60/100 al Ø 80/125 Intake and
Exhaust 2 m 0,1 m 0,3 Intake m 0,8
Exhaust m 0,6
Pipe Ø 80 m 1 (with and without insulation) Intake 2,3 m 0,1 m 0,4 Intake m 1,0
Scarico 3 m 0,2 m 0,5 Exhaust m 1,0
Complete air intake terminal Ø 80 m 1
(with or without insulation) Intake 5 m 0,3 m 0,8 Intake m 2,2
Intake terminal Ø 80
Exhaust terminal Ø 80 Intake 3 m 0,2 m 0,5 Intake m 1,3
Scarico 2,5 m 0,1 m 0,4 Exhaust m 0,8
Bend 90° Ø 80 Intake 5 m 0,3 m 0,8 Intake m 2,2
Scarico 6,5 m 0,4 m 1,1 Exhaust m 2,1
Bend 45° Ø 80 Intake 3 m 0,2 m 0,5 Intake m 1,3
Scarico 4 m 0,2 m 0,6 Exhaust m 1,3
Parallel split Ø 80
from Ø 60/100 to Ø 80/80 Intake and
Exhaust 8,8 m 0,5 m 1,5 Intake m 3,8
Exhaust m 2,9
Tables of Resistance Factors and Equivalent Lengths.

13
1
3
2
45
C12
1-13
C12
C12 C12
C12
1-14
1-16
1-17
1-15
INSTALLERUSER
MAINTENANCE TECHNICIAN
1.9 INDOOR INSTALLATION.
• Type C conguration, sealed chamber and
fan assisted.
Horizontal intake - exhaust kit Ø60/100. Kit
assembly (Fig. 1-13): install the bend with ange
(2) onto the central hole of the boiler inserting
the gasket (1) and tighten using the screws in the
kit. Couple the terminal pipe (3) with the male
end (smooth) into the female end of the bend
(with lip seals) up to the stop; making sure that
the internal wall sealing plate and external wall
sealing plate have been tted, this will ensure
sealing and joining of the elements making up
the kit.
Note: when the boiler is installed in areas where
very rigid temperatures can be reached, a special
anti-freeze kit is available that can be installed as
an alternative to the standard kit.
• Coupling extension pipes and concentric
elbows Ø60/100. To snap-t extensions with
other elements of the ue extraction elements,
operate as follows engage the concentric pipe
or elbow with the male side (smooth) on the
female section (with lip seal) up to the stop
on the previously installed element. is will
ensure sealing and joining of the elements
correctly.
e Ø60/100 horizontal intake/exhaust kit can
be installed with the rear, right side, le side and
front outlet.
• Application with rear outlet (Fig. 1-14). e
970 mm pipe length enables routing through
a maximum thickness of 710 mm. Normally
the terminal must be shortened. Calculate
the distance by adding the following values:
Part thickness + internal projection + exter-
nal projection. e minimum indispensable
projection values are given in the gure.
• Application with side outlet (Fig. 1-15); Using
the horizontal intake-exhaust kit, without the
special extensions, enables routing through
a wall thickness of 724 mm with the le side
outlet and 646 with the right side outlet.
• Extensions for horizontal kit. e horizontal
intake-exhaust kit Ø60/100 can be extended
up to a max. horizontal distance of 3,000 mm
including the terminal with grid and excluding
the concentric bend leaving the boiler. is
conguration corresponds to a resistance factor
of 100. In these cases the special extensions
must be requested.
Connection with N°1 extension (Fig. 1-16).
Max. distance between vertical boiler axis and
external wall is 1855mm.
Connection with N°2 extensions (Fig. 1-17).
Max. distance between vertical boiler axis and
external wall is 2805mm.
Horizontal intake-exhaust kit Ø80/125. Kit
assembly (Fig. 1-18): install the bend with ange
(2) onto the central hole of the boiler inserting
the gasket (1) and tighten using the screws in the
kit. Fit the male end (smooth) of the adapter (3)
up to the stop on the female end of the bend (2)
(with lip seal). Fit the Ø80/125 (4) concentric
terminal pipe with the male end (smooth) to the
female end of the adapter (3) (with lip gasket) up
to the stop; making sure that the internal wall
sealing plate and external wall sealing plate have
been tted, this will ensure sealing and joining
of the elements making up the kit.
• Coupling extension pipes and concentric elbows
Ø80/125. To snap-t extensions with other ele-
ments of the ue extraction elements, operate as
follows engage the concentric pipe or elbow with
the male side (smooth) on the female section
(with lip seal) up to the stop on the previously
installed element. is will ensure sealing and
joining of the elements correctly.
e kit includes:
N°1 - Gasket (1)
N°1 - Concentric bend 90° (2)
N°1 - Intake-exhaust concentric pipe
Ø60/100 (3)
N°1 - Internal wall sealing plate (4)
N°1 - External wall sealing plate (5)

14
1
3
2
56
4
C32
1-21
1-20
C32
C12
1-18
C12
1-19
1
2
3
4
6
57
8
INSTALLERUSER
MAINTENANCE TECHNICIAN
MAXIMUM LENGTH
MAXIMUM LENGTH
Vertical kit with aluminium tile Ø80/125. Kit
assembly (Fig. 1-20): install the concentric ange
(2) on the central hole of the boiler inserting the
gasket (1) and tighten using the screws in the
kit. Fit the male end (smooth) of the adapter (3)
into the female end of the concentric ange (2).
Imitation aluminium tile installation. Replace the
tile with the aluminium sheet (5), shaping it to
ensure that rainwater runs o. Position the xed
half-shell (7) and insert the intake-exhaust pipe
(6). Fit the Ø80/125 concentric terminal pipe
with the male end (6) (smooth) to the female
end of the adapter (3) (with lip gasket) up to the
stop; making sure that the wall sealing plate has
been tted, this will ensure sealing and joining
of the elements making up the kit.
• Coupling extension pipes and concentric
elbows. To install push-fitting extensions
with other elements of the flue extraction
elements assembly, proceed as follows: engage
the concentric pipe or elbow with the male
side (smooth) on the female section (with lip
seal) up to the stop on the previously installed
element. is will ensure sealing and joining
of the elements correctly.
Important: if the exhaust terminal and/or exten-
sion concentric pipe needs shortening, consider
that the internal pipe must always protrude by
5mm with respect to the external pipe.
is specic terminal enables ue exhaust and
air intake, necessary for combustion, in a vertical
direction.
N.B.: e Ø80/125 vertical kit with aluminium
tile enables installation on terraces and roofs
with a maximum slope of 45% (25°) and the
height between the terminal cap and half-shell
(374mm) must always be respected.
e vertical kit with this conguration can be
extended up to a maximum of 12,200 mmvertical
rectilinear, with the terminal included (Fig. 1-21).
is conguration corresponds to a resistance
factor of 100. In this case the special extensions
must be requested.
The terminal Ø60/100 can also be used for
vertical exhaust, in conjunction with concentric
flange code 3.011141 (sold separately). The
height between the terminal cap and half-shell
(374mm) must always be respected.
e vertical kit with this conguration can be
extended up to a maximum of 4,700 mm vertical
rectilinear, with the terminal included (Fig. 1-21).
Separator kit Ø80/80. e Ø80/80 separator kit,
allows separation of theexhaustues andair intake
pipesaccordingtothediagramshownin thegure.
Combustion products are expelled from pipe (S).
Air is taken in through pipe (A) for combustion.
e intake pipe (A) can be installed either on the
right or le hand side of the central exhaust pipe
(S). Both ducts can be routed in any direction.
• Kit assembly (Fig. 1-22): install ange (4) on the
central hole of the boiler, tting gasket (1) and
tighten with the at-tipped hex screws included
in the kit. Remove the at ange present in the
lateral hole with respect to the central one (ac-
cording to needs) and replace it with the ange
(3), positioning the gasket (2) already present in
the boiler and tighten using the supplied self-
threading screws. Fit the male end (smooth) to
the bends (5) in the female end of the anges
(3 and 4). Fit the intake terminal (6) with the
male section (smooth) in the female section of
the bend (5) up to the stop, ensuring that the
internal and external wall sealing plates are
tted. Fit the exhaust pipe (9) with the male end
(smooth) to the female end of the bend (5) up
to the stop; making sure that the internal wall
sealing plate has been tted, this will ensure
sealing and joining of the elements making up
the kit.
e kit includes:
N°1 - Gasket (1)
N°1 - Female concentric ange
(2)
N°1 - Adapter Ø60/100
for Ø80/125 (3)
N°1 - Wall sealing plate (4)
N°1 - Aluminium tile (5)
N°1 - Concentric intake-
exhaust terminal
Ø80/125 (6)
N°1 - Fixed half-shell (7)
N°1 - Mobile half-shell (8)
e kit includes:
N°1 - Gasket (1)
N°1 - Concentric bend Ø60/100 (2)
N°1 - Adapter Ø60/100 for Ø80/125 (3)
N°1 - Int./exhaust concentric terminal
Ø80/125 (4)
N°1 - Internal wall sealing plate (5)
N°1 - External wall sealing plate (6)

15
4
6
5
1
3
2
78
5
9
7A
S
C82
1-22
C42
C52
1-23
1-25
C82
1-24
INSTALLERUSER
MAINTENANCE TECHNICIAN
Maximum usable length
(including intake terminal with grill and two 90° bends)
NON INSULATED PIPE INSULATED PIPE
Exhaust (m) Intake (m) Exhaust (m) Intake (m)
1 36,0* 6 29,5*
2 34,5* 7 28,0*
3 33,0* 8 26,5*
4 32,0* 9 25,5*
5 30,5* 10 24,0*
* e air intake pipe can be increased to 2.5 metres if the exhaust bend is
eliminated, 2 metres if the air intake bend is eliminated, and 4.5 metres
eliminating both bends.
11 22,5*
12 21,5*
• Extension pipes and elbows push-ttings. To
install push-tting extensions with other ele-
ments of the ue extraction elements assembly,
proceed as follows: engage the pipe or elbow
with the male side (smooth) in the female
section (with lip seal) up to the stop on the
previously installed element. is will ensure
sealing eciency of the coupling.
• Installation clearances. Figure 1-22 gives the
min. installation space dimensions of the
Ø80/80 separator terminal kit in limited
conditions.
• Figure 1-23 shows the conguration with ver-
tical exhaust and horizontal intake.
• Extensions for the separator kit Ø80/80. e
max. vertical straight length (without bends)
that can be used for Ø80 intake and exhaust
pipes is 41 metres of which 40 intake and 1
exhaust. The total length corresponds to a
resistance factor of 100. e total usable length
obtained by adding the length of the intake and
exhaust pipes Ø80, must not exceed the values
stated in the following table. If mixed accesso-
ries or components are used (e.g. changing from
a separator Ø80/80 to a concentric pipe), the
maximum extension can be calculated by using
a resistance factor for each component or the
equivalent length. e sum of these resistance
factors must not exceed 100.
• Temperature loss in flue ducts. To prevent
problems of ue gas condensate in the exhaust
pipe Ø80, due to ue gas cooling through the
wall, the length of the pipe must be limited to
just 5 m. (Fig. 1-25). If longer distances must
be covered, use Ø80 pipes with insulation (see
insulated separator kit Ø80/80 chapter).
N.B.: when installing the Ø80 ducts, a section
clamp with pin must be installed every 3metres.
e kit includes:
N°1 - Exhaust gasket (1)
N°1 - Flange seal (2)
N°1 - Female intake ange (3)
N°1 - Female exhaust ange (4)
N°2 - 90° bend Ø 80 (5)
N°1 - Intake terminal Ø 80 (6)
N°2 - Internal wall sealing plates (7)
N°1 - External wall sealing plate (8)
N°1 - Exhaust pipe Ø 80 (9)
Important: if installation requires extending the ue ttings up to the exhaust a length that exceeds the 12 m recommended, it is necessary to properly
consider the possibility that condensation may form inside the duct and therefore Immergas “Serie Blu” insulated ue ttings, or other ue ttings with
similar characteristics, should be used.

16
C82
1-27
1-28
C82
C82
1-26
5
4
1
3
2
5678
8
10 11 9
SA
INSTALLERUSER
MAINTENANCE TECHNICIAN
Insulated separator kit Ø80/80. Kit assembly
(Fig. 1-26): install ange (4) on the central hole of
the boiler, tting gasket (1) and tighten with the
at-tipped hex screws included in the kit. Remo-
ve the at ange present in the lateral hole with
respect to the central one (according to needs)
and replace it with the ange (3), positioning
the gasket (2) already present in the boiler and
tighten using the supplied self-threading screws.
Insert and slide cap (6) onto bend (5) from the
male side (smooth), and join bends (5) with the
male side (smooth) in the female side of ange
(3). Fit bend (11) with the male side (smooth)
into the female side of ange (4). Fit the male
end (smooth) of the intake terminal (7) up to the
stop on the female end of the bend (5), making
sure you have already inserted the wall sealing
plates (8 and 9) that ensure correct installation
between pipe and wall, then x the closing cap
(6) on the terminal (7). Join the exhaust pipe (10)
with the male side (smooth) in the female side
of the bend (11) to the end stop, ensuring that
the wall sealing plate (8) is already inserted for
correct installation between the pipe and ue.
• Coupling extension pipes and elbows. To snap-
t extensions with other elements of the ue gas
extraction elements, operate as follows: engage
the concentric pipe or elbow with the male
side (smooth) on the female section (with lip
seal) up to the stop on the previously installed
element. is will ensure sealing and joining
of the elements correctly.
• Insulation of separator terminal kit. Whenever
there are ue gas condensate problems in the
exhaust pipes or on the external surface of the
intake pipes, on request Immergas supplies
insulated intake-exhaust pipes. Insulation
may be necessary on the exhaust pipe, due to
excessive loss of temperature of the ue gas on
their route. Insulation may be necessary on the
intake pipe as the air entering (if very cold)
may cause the outside of the pipe to fall below
the dew point of the environmental air. e
gures (Fig. 1-27 and 1-28) illustrate dierent
applications of insulated pipes.
Insulated pipes are formed of a Ø80 internal
concentric pipe and a Ø125 external pipe with
static air space. It is not technically possible
to start with both Ø80 elbows insulated, as
clearances will not allow it. However starting
with an insulated elbow is possible by choosing
either the intake or exhaust pipe. When star-
ting with the insulated intake bend it must be
engaged on its ange until it is taken up to stop
on the ue gas exhaust ange, a situation that
takes the two intake ue gas exhaust outlets to
the same height.
• Temperature loss in insulated ue ducting.
To prevent problems of ue gas condensate in
the exhaust pipe Ø80, due to ue gas cooling
through the wall, the length of the pipe must be
limited to 12 m. e gure (Fig. 1-28) illustrates
a typical insulation application in which the
intake pipe is short and the exhaust pipe is very
long (over 5 m). e entire intake pipe is in-
sulated to prevent moist air in the place where
the boiler is installed, in contact with the pipe
cooled by air entering from the outside. e
entire exhaust pipe, except the elbow leaving
the splitter is insulated to reduce heat loss from
the pipe, thus preventing the formation of ue
gas condensate.
N.B.: When installing the insulated pipes, a
section clamp with pin must be installed every
2 metres.
• Conguration type B, open chamber and fan
assisted.
When using type B installation conguration
indoors, it is compulsory to install the relative up-
per cover kit along with the ue gas discharge kit.
e air intake comes directly from the area where
the boiler is installed and from the ue exhaust
in each single ue or directly from outdoors.
e boiler in this conguration, following the
assembly instructions stated in the par. 1.8 is
classied as type B.
With this conguration:
- air intake takes place directly from the envi-
ronment in which the boiler is installed and
only functions in permanently ventilated
rooms.
- e ue exhaust must be connected to its own
individual ue or channelled directly into the
external atmosphere.
- Type B open chamber boilers must not be
installed in places where commercial, artisan
or industrial activities take place, which use
products that may develop volatile vapours
or substances (e.g. acid vapours, glues, paints,
solvents, combustibles, etc.), as well as dusts
(e.g. dust deriving from the working of wood,
coal nes, cement, etc.), which may be dama-
ging for the components of the appliance and
jeopardise functioning.
On installation indoors in type B conguration
it is mandatory to install the relevant top cover
kit along with the ue gas exhaust kit.
The technical regulations in force must be
respected.
e kit includes:
N°1 - Exhaust gasket (1)
N°1 - Flange seal (2)
N°1 - Female intake ange (3)
N°1 - Female exhaust ange (4)
N°1 - Bend 90° Ø 80 (5)
N°1 - Pipe closure cap (6)
N°1 - Intake terminal Ø 80 insulated (7)
N°2 - Internal wall sealing plates (8)
N°1 - External wall sealing plate (9)
N°1 - Discharge pipe Ø 80 insulated (10)
N°1 - Concentric bend 90° Ø 80/125 (11)

17
INSTALLERUSER
MAINTENANCE TECHNICIAN
1.10 FLUE EXHAUST TO FLUE/CHIMNEY.
Flue gas exhaust does not necessarily have to be
connected to a branched type traditional ue.
e ue exhaust can be connected to a special
LAS type multiple ue. Multiple and combined
ues must be specially designed according to
the calculation method and requirements of the
standards, by professionally qualied technical
sta. Chimney or ue sections for connection
of the exhaust pipe must comply with requisites
of technical standards in force.
1.11 DUCTING OF EXISTING FLUES.
With a specic “ducting system” it is possible to
reuse existing ues, chimneys and technical ope-
nings to discharge the boiler ue gases. Ducting
requires the use of ducts declared to be suitable
for the purpose by the manufacturer. Follow the
installation and user instructions provided by the
manufacturer and the requirements of standards.
1.12 FLUES, CHIMNEYS AND CHIMNEY
CAPS.
e ues, chimneys and chimney caps for the
evacuation of combustion products must be in
compliance with applicable standards.
Positioning the draught terminals. e draught
terminals must:
- be installed on external perimeter walls of the
building;
- be positioned according to the minimum di-
stances specied in current technical standards.
Combustion products exhaust of fan assisted
appliances in open-top closed environments.
In spaces closed on all sides with open tops
(ventilation pits, courtyards etc.), direct ue gas
exhaust is allowed for natural or forced draught
gas appliances with a heating power range from
4 to 35 kW, provided the conditions as per the
current technical standards are respected.
1.13 SYSTEM FILLING.
Once the boiler is connected, proceed with sy-
stem lling via the lling valve (Fig. 2-2).
Filling is performed at low speed to ensure rele-
ase of air bubbles in the water via the boiler and
heating system vents.
e boiler has a built-in automatic venting valve
on the pump. Check if the cap is loose.
Open the radiator air vent valves. Close radiator
vent valves only when water escapes from them.
Close the lling valve when the boiler manometer
indicates approx. 1.2 bar.
N.B.: during these operations turn on the
circulation pump at intervals, by means of the
stand-by/summer winter button (2) positioned
on the control panel. Vent the circulation pump
by loosening the front cap and keeping the motor
running.
Tighten the cap aer the operation.
1.14 GAS SYSTEM STARTUP.
To start up the system proceed as follows:
- open windows and doors;
- avoid presence of sparks or naked ames;
- bleed all air from pipelines;
- check that the internal system is properly sealed
according to specications.
1.15 BOILER STARTUP IGNITION.
For issue of the envisioned Declaration of Con-
formity, the following must be performed for
boiler start-up:
- check that the internal system is properly sealed
according to specications;
- make sure that the type of gas used corresponds
to boiler settings;
- switch the boiler on and check correct ignition;
- make sure that the gas ow rate and relevant
pressure values comply with those given in the
manual (par. 3.18);
- ensure that the safety device is engaged in the
event of gas supply failure and check activation
time;
- check activation of the main switch located
upstream from the boiler;
- check that the intake/exhaust concentric ter-
minal (if tted) is not blocked.
e boiler must not be started up even if only
one of the checks should be negative.
N.B.: the boiler preliminary check must be carried
out by a qualied technician. e conventional
boiler warranty is valid as of the date of testing.
e test certicate and warranty is issued to the
user.

18
A
B
C
D
Maior Eolo 24 4 E
Maior Eolo 28 4 E
Maior Eolo 32 4 E
A
A
B
B
C
C
D
D
1-29
INSTALLERUSER
MAINTENANCE TECHNICIAN
Total head available to the system.
A = Head available to the system at
maximum speed with by-pass
excluded.
B = Head available to the system at
maximum speed with by-pass
inserted.
C = Head available to the system
at second speed with by-pass
excluded.
D = Head available to the system
at second speed with by-pass
inserted.
1.16 CIRCULATION PUMP.
e boilers are supplied with a built-in circula-
tion pump with 3-position electric speed control.
e boiler does not operate correctly with the
circulation pump on rst speed. To ensure opti-
mal boiler operation, in the case of new systems
(single pipe and module) it is recommended to
use the pump at maximum speed. e pump is
already tted with a condenser.
Pump release. If, aer a prolonged period of
inactivity, the circulation pump is blocked,
unscrew the front cap and turn the motor sha
using a screwdriver. Take great care during this
operation to avoid damage to the motor.
By-pass regulation (part. 26 Fig. 1-30). If ne-
cessary, the by-pass can be regulated according
to system requirements from a minimum (by-
pass excluded) to a maximum (by-pass inserted)
represented by the graphics (Fig. 1-29). Make
the regulation using a at head screwdriver, turn
clockwise and insert the by-pass, anti-clockwise
it is excluded.
Head (kPa)Head (kPa)
Head (m H2O)Head (m H2O)Head (m H2O)
Flow rate (l/h)
Flow rate (l/h)
Flow rate (l/h)
Head (kPa)

19
1- 30
INSTALLERUSER
MAINTENANCE TECHNICIAN
Key:
1 - Sample points (air A) - (ue gas F)
2 - Sealed Chamber
3 - Fan
4 - Combustion chamber
5 - Domestic hot water ow switch
6 - Gas valve
7 - Domestic hot water probe
8 - System lling valve
9 - Positive signal pressure point
10 - Negative signal pressure point
11 - Flue pressure switch
12 - Delivery probe
13 - Flue hood
14 - Safety thermostat
15 - Primary heat exchanger
16 - Ignition and detection electrodes
17 - System expansion vessel
18 - Aqua Celeris
19 - Burner
1.17 KITS AVAILABLE ON REQUEST.
• System shut o valves kit. e boiler is designed
for installation of system interception cocks
to be placed on ow and return pipes of the
connection assembly. is kit is particularly
useful for maintenance as it allows the boiler to
be drained separately without having to empty
the entire system.
• System zone control unit Kit. If the central he-
ating system is to be divided into several zones
(max. three) in order to interlock them with
separate adjustments and to keep water ow
rate high for each zone, Immergas supplies zone
system kits on request.
• Polyphosphate dispenser kit. e polyphosphate
dispenser reduces the formation of lime-scale
and preserves the original heat exchange and
domestic hot water production conditions.
e boiler is prepared for application of the
polyphosphate dispenser kit.
• Cover kit. For outdoor installations, in partially
protected areas and with direct air intake, the
top protection cover must be tted for a correct
functioning of the boiler and to protect it from
storms (Fig. 1-5). For indoor installations, type
B conguration, a suitable top protection cover
coupled with the ue exhaust kit must be tted.
• Anti freeze kit with resistance (on request). If
the boiler is installed in a place where the tem-
perature falls below -5°C and in the event there
is no gas, the appliance can freeze. To prevent
freezing of the domestic hot water system, an
anti freeze kit with an electrical resistance can be
tted from the relative cable and from a control
thermostat.
e above-mentioned kits are supplied complete
with instructions for assembly and use.
1.18 BOILER COMPONENTS.
20 - System pressure switch
21 - Vent valve
22 - Boiler pump
23 - Plate heat exchanger
24 - ree-way valve (motorised)
25 - System draining valve
26 - By-pass
27 - 3 bar safety valve
N.B.: connection group (optional)

20
2-1
INSTALLERUSER
MAINTENANCE TECHNICIAN
2.3 CONTROL PANEL.
Key:
1 - Central heating temperature selector
2 - Domestic hot water temperature selec-
tor
3 - On/Stand-by/O Button
4 - Summer/Winter Button
5 - Reset button
6 - Boost Button for Aqua Celeris activa-
tion
7 - Functioning in summer mode
8 - Boiler in Stand-by mode
9 - Functioning in winter mode
10 - Boiler in block does not require release
via “RESET” button
11 - Flame presence symbol and relative
power scale
12 - Functioning room central heating phase
active
13 - Solar function active
14 - Presence of anomalies
15 - Chimney sweep function in progress
16 - Functioning production phase active
17 - Domestic hot water temperature set
18 - Boiler connected to remote controlV2
(optional)
19 - Functioning with external temperature
probe active (optional)
20 - Aqua Celeris Function active
21 - Central heating temperature set
22 - Boiler manometer
2INSTRUCTIONS FOR USE AND MAINTENANCE
2.1 CLEANING AND MAINTENANCE.
Important: the heating systems must undergo
periodical maintenance (regarding this, see the
section dedicated to the technician, relative to
“yearly control and maintenance of the applian-
ce”) and regular checks of energy efficiency
in compliance with national, regional or local
provisions in force. is ensures that the optimal
safety, performance and operation characteristics
of the boiler remain unchanged over time.
We recommend stipulating a yearly cleaning and
maintenance contract with your zone technician.
2.2 GENERAL WARNINGS.
Never expose the wall-mounted boiler to direct
vapours from a cooking surface.
Use of the boiler by unskilled persons or children
is strictly prohibited.
Do not touch the ue gas exhaust terminal (if pre-
sent) due to the high temperatures it can reach;
For safety purposes, check that the concentric
air intake/flue exhaust terminal (if fitted), is
not blocked.
If temporary shutdown of the boiler is required,
proceed as follows:
a) drain the water system if anti-freeze is not
used;
b) shut-o all electrical, water and gas supplies.
In the case of work or maintenance to structures
located in the vicinity of ducting or devices for ue
extraction and relative accessories, switch o the
appliance and on completion of operations ensure
that a qualied technician checks eciency of the
ducting or other devices.
Never clean the appliance or connected parts
with easily ammable substances.
Never leave containers or ammable substances
in the same environment as the appliance.
• Attention: the use of components that employ
electrical power requires some fundamental
rules to be observed:
- do not touch the appliance with wet or moist
parts of the body; do not touch when barefoot;
- never pull electrical cables or leave the ap-
pliance exposed to atmospheric agents (rain,
sunlight, etc.);
- the appliance power cable must not be replaced
by the user;
- in the event of damage to the cable, switch o
the appliance and contact exclusively qualied
sta for replacement;
- if the appliance is not to be used for a certain
period, disconnect the main power switch.