Immergas EOLO Maior Installation and operation manual

MAIOR EOLO
24 - 28 - 32
Instruction and
recommendation booklet
IE
*1.038763ENG*

e manufacturer declines all liability due to printing or transcription errors, reserving the right to make any modications to its technical and com-
mercial documents without prior notice.
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.
For assistance and scheduled maintenance contact Authorised 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 from bad weather.
e instruction book is an integral and essential part of the product and must also be given to the new user 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 an authorised company,
which has specic technical expertise in the system sector, as required by Law.
Improper installation or assembly of the Immergas appliance and/or components, accessories, kit and devices can cause unexpected problems for people, animals
and objects. Read the instructions provided with the product carefully to ensure proper installation.
Maintenance must be carried out by an authorised company. e Authorised Aer-sales Service represents a guarantee of qualication 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.
Product not intended for EU countries.

INDEX
USER pageINSTALLER page MAINTENANCE TECHNICIAN page
1 Boiler installation......................................5
1.1 Installation recommendations.................5
1.2 Main dimensions......................................6
1.3 Antifreeze protection................................6
1.4 Gas connection..........................................7
1.5 Hydraulic connection...............................7
1.6 Electrical connection................................7
1.7 Remote controls and room chrono-
thermostats (Optional).............................8
1.8 External probe (Optional). .....................8
1.9 Immergas ue systems.............................9
1.10 Outdoor installation in a partially
protected area. .........................................12
1.11 Concentric horizontal kit installation..13
1.12 Concentric vertical kit installation. .......14
1.13 Separator kit installation........................15
1.14 Ducting of ues or technical slots.........17
1.15 Conguration type B22, open chamber
and forced draught for indoors. ............17
1.16 Flue exhaust to ue/chimney.................17
1.17 Flues, chimneys, chimney pots and
terminals...................................................17
1.18 System lling............................................17
1.19 Gas system start-up.................................17
1.20 Boiler start up (ignition). .......................17
1.21 Circulation pump....................................18
1.22 Kits available on request.........................19
1.23 Boiler components..................................19
2 Use and maintenance instructions........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. .....................................22
2.6 Boiler shutdown ......................................23
2.7 Restoring central heating system
pressure.....................................................23
2.8 System draining......................................23
2.9 Antifreeze protection..............................23
2.10 Case cleaning...........................................23
2.11 Decommissioning. ..................................23
3 Boiler start-up (initial check) ................24
3.1 Hydraulic diagram. .................................24
3.2 Wiring diagram.......................................25
3.3 Troubleshooting. .....................................25
3.4 Information menu...................................26
3.5 Programming the P.C.B..........................26
3.6 Converting the boiler to
other types of gas.....................................28
3.7 Checks following conversion
to another type of gas. ............................28
3.8 Possible adjustments...............................28
3.9 Slow automatic ignition function..........28
3.10 ‘’Chimney sweep’’ function....................29
3.11 Pump anti-block function......................29
3.12 three-way anti-block function...............29
3.13 Radiator antifreeze function..................29
3.14 P.C.B. periodical self-check....................29
3.15 Solar panels coupling function..............29
3.16 appliance check and maintenance. .......29
3.17 Casing removal........................................30
3.18 Variable heat output................................32
3.19 Combustion parameters.........................34
3.20 Technical data..........................................35
3.21 Key for data nameplate...........................36

5
1-1
INSTALLERUSERMAINTENANCE TECHNICIAN
1BOILER INSTALLATION
1.1 INSTALLATION
RECOMMENDATIONS.
e Maior Eolo boiler has been designed for wall
mounted installation, for heating and produc-
tion of domestic hot water for domestic use and
similar purposes.
e place of installation of the appliance and
relative Immergas accessories must have suitable
features (technical and structural), such as to al-
low for (always in safe, ecient 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 (outdoors in the place for loading and
transporting the appliances and components)
as well as their eventual replacement with ap-
pliances 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
sealed chamber boilers for air intake and expul-
sion of ue gas.
Only professionally enabled companies are
authorised to install Immergas gas appliances.
Installation must be carried out according to
regulation standards, current legislation and in
compliance with local technical regulations and
the required technical procedures.
Attention: the manufacturer declines all liability
for damages caused by boilers removed from
other systems or for any non-conformities of
such equipment.
Before installing the appliance, ensure that it is
delivered in perfect condition; if in doubt, contact
the supplier immediately. Packing materials (sta-
ples, nails, plastic bags, polystyrene foam, etc.)
constitute a hazard and must be kept out of the
reach of children. If the appliance is installed in-
side or between cabinets, ensure sucient 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 the drain trap is blocked, or
if there are leaks from the hydraulic connec-
tions; otherwise, the manufacturer cannot be
held responsible for any damage caused to the
household appliances.
For the aforementioned reasons, we recommend
not placing furnishings, furniture, etc. under
the boiler.
In the event of malfunctions, faults or incorrect
operation, turn the appliance o and contact an
authorised company (e.g. the Authorised Tech-
nical 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
area is one in which the appliance is not
exposed to the direct action of the weather
(rain, snow, hail, etc..).
N.B.: this type of installation is only possible
when permitted by the laws in force in the ap-
pliance's country of destination.
- Installation of gas appliances, ue exhaust
pipes and combustion air intake pipes is
forbidden in places with a re risk (for ex-
ample: garages, closed parking stalls), and
in potentially dangerous places.
- Installation is prohibited on the vertical
projection of cooking hobs.
- Installation is forbidden in places/rooms that
constitute public areas of apartment build-
ings, internal stairways or other escape routes
(e.g. oor landings, entrance halls, etc.).
- Installation is also forbidden in places/rooms
that constitute public areas of apartment
buildings such as cellars, entrance halls, at-
tics, los, etc., unless otherwise provided for
by local regulations in force.
Attention: 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 (ac-
cording 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 suit-
able for their capacity and voltage.
YES NO

6
1-2
INSTALLERUSERMAINTENANCE TECHNICIAN
Key:
G - Gas supply
AC - Domestic hot water outlet
ACV - Solar valve kit D.H.W. inlet
(Optional)
AF - Domestic cold water inlet
R - System return
M - System ow
V - Electrical connection
* = the boiler is equipped with a 90° gas
cock with 3/4” attachments and Ø18
mm tting to be welded.
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”
1.2 MAIN DIMENSIONS.
1.3 ANTIFREEZE 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 antifreeze 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 ignition failure block (Par.
2.5);
- the boiler essential components are not faulty.
In these conditions the boiler is protected against
freezing to an ambient temperature of -5°C.
Minimum temperature -15°C. If the boiler is
installed in a place where the temperature falls
below -3°C and in the event there is no gas (or
the boiler goes into ignition failure block), the
appliance can freeze.
To prevent the risk of freezing follow the instruc-
tions below:
- protects the central heating circuit from freez-
ing by introducing a top quality anti-freeze
liquid into this circuit, which is not noxious to
health. e instructions of the manufacturer of
this liquid must be followed scrupulously re-
garding the percentage necessary with respect
to the minimum temperature at which the
system must be kept. An aqueous solution must
be made with potential pollution class of water
2 (EN 1717:2002 or local regulations in force).
Warning: the excessive use of glycol could
jeopardise the proper functioning of the ap-
pliance.
e materials used for the central heating circuit
of Immergas boilers withstand ethylene and
propylene glycol based antifreeze liquids (if the
mixtures are prepared perfectly).
For life and possible disposal, follow the sup-
plier's instructions.
- Protect the domestic hot water circuit against
freezing by using an accessory that is supplied
on request (antifreeze 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 antifreeze protection is thus ensured only if:
- the boiler is correctly connected to electricity
power supply circuits;
- the main switch is on;
- the antifreeze 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 attach-
ment pipes must be insulated.

7
CAVO ALIMENTAZIONE 1-3
INSTALLERUSERMAINTENANCE TECHNICIAN
1.4 GAS CONNECTION.
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
name plate). If dierent, the appliance must be
converted for operation with the other type of
gas (see converting appliance for other gas types).
The dynamic gas supply (methane or LPG)
pressure must also be checked according to the
type used in the boiler, which must comply with
the technical standards in force, as insucient
levels can reduce generator output and cause
malfunctions.
Ensure correct gas cock connection. e gas sup-
ply pipe must be suitably dimensioned according
to current regulations in order to guarantee cor-
rect gas ow rate 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 technical
standards in force.
Fuel gas quality. e appliance was designed
to operate with combustible gas free of impuri-
ties; otherwise it is advisable to t special lters
upstream of the appliance to restore the purity
of the fuel.
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.
1.5 HYDRAULIC CONNECTION.
Attention: in order not to void the heat primary
exchanger 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.
A treatment of the heating and water system wa-
ter is required, in compliance with the technical
standards in force, in order to protect the system
and the appliance from deposits (e.g. scale),
slurry or other hazardous deposits.
Water 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 manufactur-
er declines any responsibility in case of ooding
if the drain valve cuts in.
Attention: the manufacturer declines all liability
in the event of damage caused by the installation
of an automatic lling system.
In order to meet the system requirements es-
tablished by the technical regulation in force in
relation to the 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.
Attention: to preserve the duration and the ef-
ciency features of the appliance, in the presence
of water whose features can lead to the deposit of
scale, installation of the “polyphosphate dispenser”
kit is recommended.
1.6 ELECTRICAL CONNECTION.
e “Maior Eolo” boiler has an IPX5D protection
rating for the entire appliance. Electrical safety
of the appliance is reached only when it is cor-
rectly connected to an ecient earthing system
as specied by current safety standards.
Attention: the manufacturer declines any re-
sponsibility for damage or physical injury caused
by failure to connect the boiler to an ecient
earth system or failure to comply with the refer-
ence standards.
Also ensure that the electrical installation cor-
responds to maximum absorbed power specica-
tions as shown on the boiler data-plate. Boilers
are supplied complete with an “X” type power
cable without plug. e power supply cable must
be connected to a 230V ±10% / 50Hz mains sup-
ply respecting L-N polarity and earth connection;
, this network must also have a multi-pole cir-
cuit breaker with class III over-voltage category.
When replacing the power supply cable, contact
a qualied rm (e.g. the Authorised Aer-Sales
Technical Assistance Service). e power cable
must be laid as shown (Fig. 1-3).
In the event of mains fuses replacement on the
modulation board, use a 3.15A fast fuses. For
the main power supply to the appliance, never
use adapters, multiple sockets or extension leads.
SUPPLY VOLTAGE CABLE

8
45
31
58
1-4
1-6
1-5
INSTALLERUSERMAINTENANCE TECHNICIAN
MAX
MIN
Position of the central heating tem-
perature user adjustment
1.7 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. 1-4).
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 Immergas chrono-thermostat.
e chrono-thermostat allows:
- set two room temperature value: one for
daytime (comfort temperature) and one for
night-time (reduced temperature);
- set a weekly program with four daily switch
on and switch o times;
- select the required operating mode from the
various possible alternatives:
- manual mode (with adjustable tempera-
ture).
- automatic mode (with set program).
- forced automatic mode (momentarily
changing the temperature of the automatic
program).
e chrono-thermostat is powered by two 1.5V
LR 6 type alkaline batteries.
• Comando Amico Remoto remote controlV2
(CARV2) with chrono-thermostat function.
In addition to the functions described in the
previous point, the CARV2 panel enables the
user to control all the important information
regarding operation of the appliance and the
heating system with the opportunity to easily
intervene on the previously set parameters,
without having to go to where the appliance
is installed. e panel is provided with self-
diagnosis to display any boiler functioning
anomalies. The climate chrono-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 CARV2 is
fed directly by the boiler by means of the same 2
wires used for the transmission of data between
the boiler and device.
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.
Comando Amico Remoto Remote Control V2
or On/O 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 voltage, otherwise the
P.C.B. would be damaged. Any Comando Amico
Remoto Remote Control V2 must be connected to
clamps 41 and 44 eliminating jumper X40 on the
P.C:B., paying attention not to invert the polarity
in the connections (Fig. 3-2).
Important: if the Comando Amico Remoto
Remote Control V2 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
lines. Ensure elimination of this risk before mak-
ing the boiler electrical connections.
1.8 EXTERNAL PROBE OPTIONAL.
e boiler is designed for the application of the
Room ermostat (Fig. 1-5) which is available
as an optional kit. Refer to the relative instruc-
tion sheet for positioning of the external probe.
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 outdoor 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. 1-6). 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).

9
1-7
1-8
1-9
INSTALLERUSERMAINTENANCE TECHNICIAN
DIAPHRAGM
1.9 IMMERGAS FLUE SYSTEMS.
Immergas supplies various solutions separately
from the boilers regarding the installation of air
intake terminals and ue extraction, which are
fundamental for boiler operation.
Attention: the boiler must only be installed
together with an original Immergas air intake
and ue gas exhaust system, except for the C6
conguration, in compliance with the stand-
ards in force.is system can be identied by
an identication mark and special distinctive
marking bearing the note: “not for condens-
ing 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 exten-
sions, follow the direction of assembly given in
gure (Fig. 1-7).
• Resistance factors and equivalent lengths. Each
ue component has a Resistance 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 and has a dimen-
sionless size. It is however, conditioned by the
temperature of the uids that pass through the
pipe and therefore, varies according to applica-
tions 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,
can be obtained from the ratio between the
relative Resistance Factors. All boilers have an
experimentally obtainable 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. This
information allows calculations to be made to
verify the possibility of setting up various ue
congurations.
• Coupling extension pipes and concentric
elbows. To install push-tting extensions with
other elements of the ue, proceed as follows:
Install the concentric pipe or elbow with the
male side (smooth) on the female side (with lip
seal) to the end stop on the previously installed
element in order to ensure sealing eciency of
the coupling.
Attention: if the exhaust terminal and/or
concentric extension pipe needs shortening,
consider that the internal duct must always
protrude by 5 mm with respect to the external
duct.
• N.B.: for safety purposes, do not obstruct the
boiler intake/exhaust terminal, even temporar-
ily.
• N.B.: during the installation of the horizontal
pipes one must install a section clamp with
gusset every 3 metres for non-insulated pipes
and one every 2 metres for insulated pipes.
Flue gas separator adjustment. For correct
functioning of the boiler it is necessary to regu-
late the ue gas shutter positioned on the air/ue
gas sample points (Fig. 1-8).
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.
e appropriate adjustment is chosen based on
type of pipe and its extension: this calculation
can be made using specic tables.
Intake diaphragm installation. For correct
boiler 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. 1-9). e appropriate
diaphragm is chosen based on type of pipe and
its maximum extension: this calculation can be
made using the tables below:
N.B.: the diaphragms are supplied together with
the boiler as standard.

10
INSTALLERUSERMAINTENANCE TECHNICIAN
Shutter regulation table
Maior Eolo 24.
Shutter regulation table
Maior Eolo 28.
Shutter regulation table
Maior Eolo 32.
Flue gas shutter notch
Type of installation
(extension of duct in metres) 1 3 4 5 6 10
Ø 60/100 horizontal concentric kit - - From 0 to
0.5
From 0.5 to
1.5 -From 1.5 to 3.0
Ø 60/100 vertical concentric kit - - From 0 to
2.2
From 2.2 to
3.7 -From 3.7 to 4.7
Ø 80/125 horizontal concentric kit - - From 0 to
0.5
From 0.5 to
4.6 -From 4.6 to 7.4
Ø 80/125 vertical concentric kit From 0 to
5.4
From 5.4 to
9.5 -From 9.5 to 12.2
Ø 80 vertical separator kit without bends *From 0
to 20
*From 20
to 40
**From 0
to 22 - - **From 22 to 32
Ø 80 horizontal separator kit with two bend *From 0
to 16
*From 16
to 35
**From 0
to 17 - - **From 17 to 28
Direct intake kit and Ø 80 drain in B22 conguration - - From 0 to 1 - From 1 to 12 -
* ese maximum extension values are considered intake with 1 metre exhaust pipe.
** ese maximum extension values are considered in draining with 1 metre intake pipe and Ø 44 diaphragm on the intake hole.
Flue gas shutter notch
Type of installation
(extension of duct in metres) 3 4 5 6 10
Ø 60/100 horizontal concentric kit - - From 0 to
0.5
From 0.5 to
1.5
From 1.5 to
3.0
Ø 60/100 vertical concentric kit - - From 0 to
2.2
From 2.2 to
3.7
From 3.7 to
4.7
Ø 80/125 horizontal concentric kit - - From 0 to
0.5
From 0.5 to
4.6
From 4.6 to
7.4
Ø 80/125 vertical concentric kit From 0 to
5.4
From 5.4 to
9.5
From 9.5 to
12.2
Ø 80 vertical separator kit without bends *From 0
to 20
*From 20
to 40
**From 0
to 22 -**From 22 to 32
Ø 80 horizontal separator kit with two bend *From 0
to 16
*From 16
to 35
**From 0
to 17 -**From 17 to 28
Direct intake kit and Ø 80 drain in B22 conguration - From 0 to 1 - From 1 to 12 -
* ese maximum extension values are considered intake with 1 metre exhaust pipe.
** ese maximum extension values are considered in draining with 1 metre intake pipe and Ø 50 diaphragm on the intake hole.
Flue gas shutter notch
Type of installation
(extension of duct in metres) 2 4 7 10
Ø 60/100 horizontal concentric kit - From 0 to
0.5
From 0.5 to
1.5
From 1.5 to
3.0
Ø 60/100 vertical concentric kit - From 0 to
2.2
From 2.2 to
3.7
From 3.7 to
4.7
Ø 80/125 horizontal concentric kit - From 0 to
0.5
From 0.5 to
4.6
From 4.6 to
7.4
Ø 80/125 vertical concentric kit From 0 to
5.4
From 5.4 to
9.5
From 9.5 to
12.2
Ø 80 vertical separator kit without bends *From 0
to 20
*From 20
to 40
**From 0
to 22
**From 22
to 32
Ø 80 horizontal separator kit with two bend *From 0
to 16
*From 16
to 35
**From 0
to 17
**From 17
to 28
Direct intake kit and Ø 80 drain in B22 conguration From 0 to 1 - From 1 to 12 -
* ese maximum extension values are considered intake with 1 metre exhaust pipe.
** ese maximum extension values are considered in draining with 1 metre intake pipe and Ø 50 diaphragm on the intake hole.

11
INSTALLERUSERMAINTENANCE TECHNICIAN
Tables of Resistance Factors and Equivalent Lengths.
TYPE OF DUCT
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 of
pipe in m
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 45° 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 hori-
zontal intake-exhaust Ø 60/100 Intake and
Exhaust 46 m 2.8 m 7.6
Intake m 20
Exhaust m 15
Concentric horizontal intake- exhaust
terminal Ø 60/100 Intake and
Exhaust 32 m 1.9 m 5.3 Intake m 14
Exhaust m 10.6
Concentric vertical intake-exhaust
terminal 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 90° Ø 80/125 Intake and
Exhaust 7.5 m 0.5 m 1.3 Intake m 3.3
Exhaust m 2.5
Concentric bend 45° 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
Concentric vertical intake-exhaust
terminal 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 hori-
zontal intake-exhaust Ø 80/125 Intake and
Exhaust 39 m 2.3 m 6.5
Intake m 16.9
Exhaust m 13
Concentric horizontal intake- exhaust
terminal 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 to 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 insula-
tion) Intake 2.3 m 0.1 m 0.4 Intake m 1.0
Exhaust 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
Exhaust 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
Exhaust 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
Exhaust 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

12
1-10
1-11 1-12
INSTALLERUSERMAINTENANCE TECHNICIAN
1.10 OUTDOOR INSTALLATION IN A
PARTIALLY PROTECTED AREA.
N.B.: a partially protected location is one in which
the appliance is not exposed to the direct action of
the weather (rain, snow, hail, etc..).
is type of installation is only possible when
permitted by the laws in force in the appliance’s
country of destination.
• Conguration type B, open chamber and
forced draught.
Using the special coverage kit one can achieve
direct air intake (Fig. 1-10) and fumes exhaust in
a single ue or directly outside. In this congura-
tion it is possible to install the boiler in a partially
protected place. In this conguration the boiler
is classied as type B.
With this conguration:
- air intake takes place directly from the envi-
ronment in which the appliance is installed
(outside);
- the fumes exhaust must be connected to its own
single ue (B23) or ducted directly outside via a
vertical terminal for direct exhaust (B53) or via
an Immergas ducting system (B53).
The technical regulations in force must be
respected.
Flue gas separator adjustment. For correct
functioning of the boiler in conguration with
direct air intake it is necessary to regulate the ue
gas shutter according to that stated in the relative
tables (page 10).
• Coverage kit assembly (Fig. 1-11). 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 2 previously-removed 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 metal sheet plate and
tighten by means of the clips present in the kit,
making sure to block the 4 gasket aps. Fit the
male end (smooth) of the exhaust terminal into
the the female end of the bend 90° Ø 80, mak-
ing sure that the relevant wall sealing plate is
already tted; this will ensure hold and joining
of the elements making up the kit.
Max. length of exhaust duct. e ue pipe
(vertical or horizontal) can be extended to a
max. length of 12 linear metres, using insulated
pipes (Fig. 1-27). 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.
• Conguration without cover kit in a partially
protected location (type C boiler).
By leaving the side plugs tted, it is possible
to install the appliance externally, in partially
covered 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 upper cover kit guarantees
additional protection for the boiler. It is recom-
mended but not compulsory.
e cover kit includes:
N° 1 ermoformed cover
N° 1 Gasket locking plate
N° 1 Gasket
N° 1 Gasket tightening clip
N° 1 Intake hole covering plate
e terminal kit includes:
N° 1 Gasket
N° 1 Discharge ange Ø 80
N° 1 Bend 90° Ø 80
N° 1 Drain pipe Ø 80
N° 1 Wall sealing plate

13
C12
1-13 1-14
1-15
C12
1-16
C12
5
4
3
1
2
1
2
3
45
6
C12
INSTALLERUSERMAINTENANCE TECHNICIAN
1.11 CONCENTRIC HORIZONTAL KIT
INSTALLATION.
Type C configuration, sealed chamber and
fan assisted.
e position of the terminal (in terms of dis-
tances from openings, overlooking buildings,
floor, etc.) must be in compliance with the
regulations in force.
is terminal is connected directly to the outside
of the building for air intake and ue exhaust. e
horizontal kit can be installed with the rear, right
side, le side or front outlet. For installation with
frontal outlet, one must use the xing plate and
a concentric bend coupling in order to ensure
sucient space to carry out the tests required
by law upon commissioning.
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-
cluded 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; mak-
ing 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.
• Extensions for Ø 60/100 horizontal kit (Fig.
1-14). e kit with this conguration can be
extended up to a max. 2,82 horizontal m in-
cluding the terminal with grid and excluding
the concentric bend leaving the boiler. is
conguration corresponds to a resistance factor
of 100. In this case the special extensions must
be requested.
NOTE: when the boiler is installed in areas where
very cold temperatures can be reached, a special
anti-freeze kit is available that can be installed as
an alternative to the standard kit.
Horizontal intake-exhaust kit Ø 80/125 Kit
assembly (Fig. 1-22): install the bend with ange
(2) onto the central hole of the boiler inserting
the gasket (1) and tighten using the screws in-
cluded in the kit. Fit the male end (smooth) of
the adapter (3) up to the end stop on the female
side 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 end stop; making
sure that the internal and external wall sealing
plates have been tted; this will ensure sealing
and joining of the elements making up the kit.
Max 2820
Max 2805
Max 7300
Max 7195
e kit includes:
N° 1 - Gasket (1)
N° 1 - Concentric bend Ø 60/100 (2)
N° 1 - Int./exhaust concentric terminal Ø 60/100 (3)
N° 1 - Internal wall sealing plate (4)
N° 1 - External wall sealing plate (5)
e kit includes:
N° 1 - Gasket (1)
N° 1 - Concentric bend Ø 60/100 (2)
N° 1 - Adapter 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)
• Extensions for horizontal kit 0 80/125 (Fig.
1-16). e kit with this conguration can be
extended up to a max. horizontal length of
7.3 m including the terminal with grid and
excluding the concentric bend leaving the
boiler and the adapter 0 60/100 in 0 80/125.
is conguration corresponds to a resistance
factor of 100. In this case the special extensions
must be requested.

14
C32
C32
C32
C32
1-18
1-20
1-19
1-17
1
2
3
6
4
7
5
1
2
3
6
8
4
7
5
INSTALLERUSERMAINTENANCE TECHNICIAN
1.12 CONCENTRIC VERTICAL KIT
INSTALLATION.
Type C configuration, sealed chamber and
fan assisted.
Concentric vertical intake and exhaust kit. is
vertical terminal is connected directly to the out-
side of the building for air intake and ue exhaust.
N.B.: the vertical kit with aluminium tile enables
installation on terraces and roofs with a maxi-
mum slope of 45% (approx 25°) and the height
between the terminal cap and half-shell (374 mm
for Ø 60/100 and 260 mm for Ø 80/125) must
always be observed.
Vertical kit with aluminium tile Ø 60/100.
Kit assembly (Fig. 1-17): install the concentric
ange (2) on the central hole of the boiler, posi-
tioning gasket (1) with the circular projections
downwards in contact with the boiler ange, and
tighten using the screws contained in the kit.
Installation of the fake aluminium tile: replace
the tiles with the aluminium sheet (4), shaping
it to ensure that rainwater runs o. Position
the xed half-shell (6) on the aluminium tile
and insert the intake-exhaust pipe (5). Fit the
Ø 60/100 (3) concentric terminal pipe with the
male side (5) (smooth) into the ange (2) up to
the end stop; making sure that the wall sealing
plate has been tted (3), this will ensure sealing
and joining of the elements making up the kit.
• Extensions for vertical kit Ø 60/100 (Fig.
1-18). e kit with this conguration can be
extended to a max. straight vertical length of 4,7
m, including the terminal. is conguration
corresponds to a resistance factor of 100. In this
case specic extensions must be requested.
Vertical kit with aluminium tile Ø 80/125.
Kit assembly (Fig. 1-19): to install the kit Ø
80/125 one must use the anged adapter kit in
order to install the ue system Ø 80/125. Install
the anged adaptor (2) on the central hole of the
boiler, positioning gasket (1) with the circular
projections downwards in contact with the boiler
ange and tighten using the screws contained
in the kit. Installation of the fake aluminium
tile: replace the tiles with the aluminium sheet
(4), shaping it to ensure that rainwater runs o.
Position the xed half-shell (5) on the aluminium
tile and insert the intake-exhaust pipe (7). Fit the
Ø 80/125 concentric terminal pipe with the male
side (smooth) to the female side of the adapter (1)
(with lip gaskets) up to the end stop; making sure
that the wall sealing plate (3) has been tted, this
will ensure sealing and joining of the elements
making up the kit.
• Extensions for vertical kit Ø 80/125 (Fig. 1-20).
e kit with this conguration can be extended
up to a max. length of 12,2 m including the ter-
minal. If additional components are assembled,
the length equivalent to the maximum allowed
must be subtracted. In this case specic exten-
sions must be requested.
MAX 45%
MAXIMUM LENGTH 12200 mm
MAX 45%
MAXIMUM LENGTH 4700 mm
e xing plate kit includes:
N° 1 - Gasket (1)
N° 1 - Female concentric ange (2)
e vertical kit includes:
N° 1 - Int./exhaust concentric pipe 0
60/100 (3)
N° 1 - Wall sealing plate (4)
N° 1 - Aluminium tile (5)
N° 1 - Fixed half-shell (6)
N° 1 - Mobile half-shell (7)
e kit includes:
N° 1 - Gasket (1)
N° 1 - Female concentric ange
(2)
N° 1 - Adapter
Ø 80/125 (3)
N° 1 - Int./exhaust concentric
pipe 0 80/125 (4)
N° 1 - Wall sealing plate (5)
N° 1 - Aluminium tile (6)
N° 1 - Fixed half-shell (7)
N° 1 - Mobile half-shell (8)

15
C82 C42
C52
1-24
C82
1-21
1-22
1-23
1
4
79
556
7
8
3
2
S
A
INSTALLERUSERMAINTENANCE TECHNICIAN
Maximum usable lengths
(including intake terminal with grill and two 90° bends)
NON-INSULATED PIPE INSULATED PIPE
Drain (metres) Intake (metres) Drain (metres) Intake (metres)
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, 4.5 metres
eliminating both bends.
11 22.5*
12 21.5*
Attention: the boiler is designed to evacuate
the combustion products up to a maximum
extension of 27 linear metres from the exhaust,
with 1 m plus 90° bend at the intake. If the
installation requires a development of the ue
to the discharge that exceeds the recommended
12 m, due consideration must be given to the
formation of condensate that could take place
inside the pipe and insulated ue kits “NOT for
condensing boilers” must be used.
1.13 SEPARATOR KIT INSTALLATION.
Type C configuration, sealed chamber and
fan assisted.
This kit allows air to come in from outside
the building and the exhaust to exit from the
chimney, ue or intubated duct through divided
ue exhaust and air intake pipes. Combustion
products are expelled from pipe (S). Air is taken
in through pipe (A) for combustion. Both ducts
can be routed in any direction.
Separator kit Ø 80/80. Kit assembly (Fig. 1-21):
install the ange (4) on the central hole of the
boiler, interposing the 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 (according to
needs) and replace it with the ange (3), position-
ing 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 end
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.
• Installation clearances (Fig. 1-22). e mini-
mum installation clearance measurements of
the Ø 80/80 separator terminal kit have been
stated in some limit conditions.
• Figure 1-23 shows the conguration with verti-
cal exhaust and horizontal intake.
• Extensions for separator kit Ø 80/80. e max.
vertical straight length (without bends) usable
for Ø 80 intake and exhaust pipes is 41 metres
of which 40 intake and 1 exhaust. is total
length corresponds to a resistance factor of
100. e total usable length obtained by sum-
ming the Ø 80 intake and exhaust pipe lengths
can reach, as a maximum, the values provided
in the following table. If mixed accessories or
components are used, the maximum extension
can be calculated by using a resistance factor
for each component or its equivalent length.
e sum of these resistance factors must not
exceed 100.
Max 45%
e kit includes:
N°1 - Exhaust gasket (1)
N°1 - Female intake ange (3)
N°1 - Flange gasket (2)
N°1 - Female exhaust ange (4)
N°2 - 90° bend Ø 80 (5)
N°1 - Intake terminal Ø 80 (6)
N°2 - Internal rings (7)
N°1 - External grey wall sealing plate (8)
N°1 - Exhaust pipe Ø 80 (9)

16
C82
1-26
1-27
C82
C82
1-25
A S
1
810
11 5
7
3
2
S
A
4
89
6
INSTALLERUSERMAINTENANCE TECHNICIAN
• Temperature loss in ue ducts (Fig. 1-24). To
prevent problems of ue gas condensate in the
exhaust pipe Ø 80, due to fume cooling through
the wall, the length of the exhaust pipe must be
limited to just 5 metres. If longer distances must
be covered, use Ø 80 pipes with insulation (see
insulated separator kit Ø 80/80 chapter).
Insulated separator kit Ø 80/80. Kit assembly
(Fig. 1-25): install the ange (4) on the central
hole of the boiler, interposing the 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. 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 ter-
minal (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 cor-
rect 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.
• 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
my 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. 1-26 and 1-27) 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 clear-
ances will not allow it. However starting with an
insulated elbow is possible by choosing either
the intake or exhaust pipe. When starting with
the insulated intake bend it must be engaged on
its ange until it is taken up to end 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
insulated exhaust pipe Ø 80, due to ue gas
cooling through the wall, the length of the pipe
must be limited to 12 metres. e gure (Fig.
1-27) illustrates a typical insulation applica-
tion in which the intake pipe is short and the
exhaust pipe is very long (over 5 m). e entire
intake pipe is insulated 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 fume condensate.
N.B.: when installing the insulated pipes, a
section clamp with gusset must be installed
every 2 metres.
MAX 12 m
e kit includes:
N°1 - Exhaust gasket (1)
N°1 - Flange gasket (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 rings (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)
MAX 21 m

17
INSTALLERUSERMAINTENANCE TECHNICIAN
1.14 DUCTING OF FLUES OR
TECHNICAL SLOTS.
Ducting is an operation through which, via
the introduction of one or more relevant pipes,
one achieves a system for the evacuation of the
combustion products of a gas appliance, made
up from the coupling of an existing or new
ducting pipe with a chimney, ue or technical
slot (also in new buildings). Ducting requires
ducts declared to be suitable for the purpose by
the manufacturer, following the installation and
user instructions, provided by the manufacturer
and the requirements of the standards in force.
1.15 CONFIGURATION TYPE B22,
OPEN CHAMBER AND FORCED
DRAUGHT FOR INDOORS.
e appliance can be installed inside buildings
in B23 mode; in this case, all technical rules and
national and local regulations in force, must be
complied with.
- 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 harm-
ful for the components of the appliance and
jeopardise operation.
- in B22 conguration, unless otherwise provided
for by local regulations in force: the boilers
must not be installed in bedrooms, bathrooms
or bedsits. ey must neither be installed in
rooms containing solid fuel heat generators
nor in rooms communicating with said rooms.
- e installation of appliances in B23 congu-
rations are only recommended in places that
are not lived in and which are permanently
ventilated.
e suitable kit referred to in paragraph 1.10
must be used for installation.
1.16 FLUE EXHAUST TO FLUE/CHIMNEY.
e ue exhaust does not necessarily have to be
connected to a branched type traditional ue.
e ue exhaust, for boiler clots installed in C
configuration, can be connected to a special
LAS type multiple ue. For Bccongurations,
exhaust is only allowed into individual chimney
or directly into the external atmosphere via a
suitable terminal. Multiple and combined ues
must be specially designed according to the
calculation method and requirements of the
technical standards in force, by a professionally
qualied company. Chimney or ue sections for
connection of the ue exhaust pipe must comply
with requisites of technical standards in force.
1.17 FLUES, CHIMNEYS, CHIMNEY POTS
AND TERMINALS.
e ues, chimneys and chimney pots for the
evacuation of combustion products must be in
compliance with applicable standards. Chimneys
and roof-installed exhaust terminals must com-
ply with the outlet height and with the distance
from technical volumes set forth by the technical
standards in force.
Positioning the wall ue exhaust terminals. e
wall ue exhaust terminals must:
- be installed on external perimeter walls of the
building;
- be positioned according to the minimum dis-
tances specied in current technical standards.
Combustion products exhaust of natural
draught or fan assisted appliances in open-top
closed environments. In spaces closed on all
sides with open tops (ventilation pits, court-
yards etc.), direct combustion product exhaust
is allowed for natural draught or fan assisted gas
appliances with a heat input range from 4 to 35
kW, provided the conditions as per the current
technical standards are respected.
1.18 SYSTEM FILLING.
Once the boiler is connected, proceed with sys-
tem lling via the lling cock (Fig. 2-2). Filling is
performed at low speed and using the automatic
vent functions to ensure release of air bubbles in
the water via the boiler and heating system vents.
e boiler has a built-in automatic venting valve
on the circulator. Check if the cap is loose. Open
the radiator vent valves.
Close radiator vent valves when only water
escapes from them.
Close the lling cock when the boiler pressure
gauge 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.
Screw the cap back on aer the operation.
1.19 GAS SYSTEM STARTUP.
To start up the system, refer to the technical
standard in force.
In particular, for new gas systems:
- open windows and doors;
- avoid presence of sparks or open ames;
- bleed all air from the pipelines;
- check that the internal system is properly sealed
according to the specications set forth by
technical regulations in force.
1.20 BOILER START UP IGNITION.
To commission the boiler (the operations listed
below must only be performed by a qualied rm
and without any unauthorised persons):
- check that the internal system is properly sealed
according to the specications set forth by
technical regulations in force;
- make sure that the type of gas used corresponds
to boiler settings;
- Check that there are external factors that may
cause the formation of fuel pockets;
- 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 intervenes in the
event of gas supply failure and check the relative
intervention time;
- check activation of the main switch located
upstream from the boiler and in the boiler;
- check that the intake and/or exhaust terminals
(if tted) are not blocked.
e boiler must not be started up even if only
one of the checks should be negative.

18
1-28
A
B
C
D
Maior Eolo 24
Maior Eolo 28
Maior Eolo 32
A
A
B
B
C
C
D
D
INSTALLERUSERMAINTENANCE TECHNICIAN
1.21 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 circulation
pump is already tted with a capacitor.
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. 25 Fig. 1-29). If nec-
essary, the by-pass can be adjusted according to
system requirements from a minimum (by-pass
excluded) to a maximum (by-pass inserted)
represented by the graph (Fig. 1-28). Make the
regulation using a at head screwdriver, turn
clockwise and insert the by-pass, anti-clockwise
it is excluded.
Head available to the system.
Head (m H2O)
Head (m H2O)Head (m H2O)
Flow rate (l/h)
Flow rate (l/h)
Flow rate (l/h)
Head (kPa)Head (kPa)Head (kPa)
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

19
1-29
INSTALLERUSERMAINTENANCE TECHNICIAN
1.23 BOILER COMPONENTS.
1.22 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 heating
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 by request.
• Polyphosphate dispenser kit. e polyphos-
phate 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. If installed outdoors in a partially
sheltered place with direct air intake, it is
compulsory to mount the appropriate top
protection cover for the correct functioning of
the water heater and to protect it from adverse
weather conditions (Fig. 1-6); or, if installed
indoors in conguration type B, it is compul-
sory to mount the appropriate top protection
cover along with the ue exhaust kit.
• 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.
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 - Flow probe
13 - Fumes hood
14 - Safety thermostat
15 - Primary heat exchanger
16 - Ignition and detection electrodes
17 - System expansion vessel
18 - Burner
19 - System pressure switch
20 - Vent valve
21 - Boiler circulator pump
22 - Plate heat exchanger
23 - ree-way valve (motorised)
24 - System draining valve
25 - By-pass
26 - 3 bar safety valve

20
2-1
INSTALLERUSERMAINTENANCE TECHNICIAN
2USE AND MAINTENANCE INSTRUCTIONS
2.1 CLEANING AND MAINTENANCE.
Attention: to preserve the boiler's integrity
and keep the safety features, performance and
reliability, which distinguish it, unchanged over
time, you must execute maintenance operations
on a yearly basis in compliance with what is stated
in the relative point at “annual check and main-
tenance of the appliance”, in compliance with
national, regional, or local standards in force.
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 air intake/
ue exhaust terminals (if tted) are not blocked.
If temporary shutdown of the boiler is required,
proceed as follows:
a) drain the heating system if antifreeze is not
used;
b) shut-o all electrical, water and gas supplies.
In the case of work or maintenance to structures
near ducting or devices for ue extraction and the
relative accessories, switch o the appliance and
on completion of the operations make sure that
an authorised company veries the eciency of
the ducting or the 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.
• Attenzione: the use of components involving
use of electrical power requires some funda-
mental 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 appli-
ance exposed to weathering (rain, sunlight,
etc.);
- the appliance power cable must not be replaced
by the user;
- if the cable is damaged, switch o the appliance
and solely contact an authorised company to
replace it;
- if the appliance is not to be used for a certain
period, disconnect the main power switch.
N.B.: the temperatures indicated by the display
have a tolerance of +/- 3°C due to environmental
conditions that cannot be attributed to the boiler.
At the end of its service life, the appliance must
not be disposed of like normal household waste
nor abandoned in the environment, but must
be removed by a professionally authorised
company. Contact the manufacturer for disposal
instructions.
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
7 - Functioning in summer mode
8 - Boiler in Stand-by mode
9 - Functioning in winter mode
10 - Boiler in block requiring unblock via
“RESET” button
11 - Flame presence symbol and relative
power scale
12 - Room central heating phase operating
mode active
13 - Solar function active
14 - Presence of anomalies
15 - Chimney sweep function in progress
16 - DHW production phase operating mode
active
17 - Domestic hot water temperature set
18 - Boiler connected to CAR V2 (optional)
19 - Functioning with external temperature
probe active (optional)
20 - Booster function active
21 - Central heating temperature set
22 - Boiler manometer
2.3 CONTROL PANEL.