Immergas EOLO Maior User manual

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EOLO Maior @
Wall-hung instant room-sealed fan
assisted boilers (type C)
User’s Manual
Installer
User
Technician

Dear Customer,
Congratulations on your purchase of a high quality Immergas product designed to ensure pro-
longed comfort and safety. As an Immergas customer you can count on a professional Authorised
Service Centre, professional personnel to guarantee constant efficiency of your boiler.
Read the following pages carefully as they contain important information on the correct use of your
boiler, observe all instructions to ma e the most of Immergas products.
Contact our local Authorised Service Centre as soon as possible to request the preliminary test
(required to validate the guarantee). Our technician will verify correct operating conditions, ma e
the necessary adjustments and will show you how to use the appliance correctly.
In the event of problems or maintenance requirements, contact our Authorised Service Centre to
ensure use of original spare parts and professional service.
General warnings
This instruction boo let is considered an integral part of the product and must be delivered to the
user with the appliance.
Store the boo let in a safe place and read carefully before using the appliance as it contains
important information to ensure safe installation operation and maintenance.
Installation and maintenance must be performed in compliance with current standards according
to the manufacturer’s instructions and by qualified personnel'.
Incorrect installation can cause damage or physical injury and the manufacturer declines all liability
for failure to observe instructions and standards. Maintenance must be performed by qualified
personnel. In this case, an Authorised Immergas Service Centre represents a guarantee of
professional and qualified services.
The appliance must be used according to the applications as specified in design. Any other use is
considered improper and therefore hazardous.
The manufacturer declines all contractual or non-contractual liability for damage caused by incorrect
installation or operation and failure to observe relative instructions.

1 Boiler Installation......................................................................................................................................3
1.1 Warnings. .................................................................................................................................................3
1.2 Main dimensions. .....................................................................................................................................3
1.3 Connection unit (supplied as standards with the boiler). .........................................................................4
1.4 Installing air inta e and flue exhaust terminals. .......................................................................................6
1.5 Flue exhaust via flues. ...........................................................................................................................15
1.6 Existing ducting flues. ............................................................................................................................15
1.7 Chimneys/Flues. ....................................................................................................................................16
1.8 System filling. .........................................................................................................................................16
1.9 Gas system start-up. ..............................................................................................................................16
1.10 Boiler start-up (ignition). .........................................................................................................................16
1.11 Circulation pump. ...................................................................................................................................17
1.12 Eolo 21-24 Maior @ boiler components. ...............................................................................................19
1.13 Eolo 27 Maior @ boiler components. .....................................................................................................20
1.14 Kits available on request. .......................................................................................................................20
2 Operation and maintenance instructions ...............................................................................................21
2.1 Preliminary testing. ................................................................................................................................21
2.2 Cleaning and Maintenance. ...................................................................................................................21
2.3 General Warnings. .................................................................................................................................21
2.4 Eolo Maior @ - Control Panel. ...............................................................................................................21
2.5 Brea downs and anomalies signaling....................................................................................................22
2.6 Boiler shutdown. ....................................................................................................................................23
2.7 Heating system pressure. ......................................................................................................................23
2.8 Draining the system. ..............................................................................................................................23
2.9 Anti-freeze protection. ............................................................................................................................23
2.10 Casing cleaning.......................................................................................................................................23
2.11 Decommissioning. ..................................................................................................................................23
3 Boiler start-up (preliminary testing) ........................................................................................................24
3.1 Eolo Maior @ hydraulic circuit diagram. ................................................................................................24
3.2 Eolo Maior @ electrical circuit diagram. ................................................................................................25
3.3 Troubleshooting. ....................................................................................................................................26
3.4 Converting the boiler in case of gas change. .........................................................................................26
3.5 Chec s following conversion to other type of gas. .................................................................................26
3.6 Possible adjustments for Eolo Maior @. ................................................................................................26
3.7 Eolo Maior @ boiler slow ignition adjustment. .......................................................................................27
3.8 Permanent reduction in timing. ..............................................................................................................27
3.9 Pump antibloc function. ........................................................................................................................27
3.10 Radiator antifreeze function. ..................................................................................................................27
3.11 Casing disassembly. ..............................................................................................................................28
3.12 Annual appliance maintenance. .............................................................................................................29
3.13 Eolo 21 Maior @ variable heating power. ..............................................................................................30
3.14 Eolo 24 Maior @ variable heating power. ..............................................................................................30
3.15 Eolo 27 Maior @ variable heating power. ..............................................................................................31
3.16 Eolo 21 Maior @ technical specifications. .............................................................................................32
3.17 Eolo 24 Maior @ technical specifications. .............................................................................................33
3.18 Eolo 27 Maior @ technical specifications. .............................................................................................34
INDEX
INSTALLER pag.
USER pag.
TECHNICIAN pag.
Immergas S.p.A. declines any responsibility for printing or writing errors, and reserves the right to alter commercial
and technical specifications without prior notice.

TECHNICIAN INSTALLER
USER
3
• Installation standards: these boilers are designed
exclusively for wall-mounted installation; they must
be used for room heating and the production of
domestic hot water for household and similar uses.
The wall surface must be smooth, i.e. without any
protrusions or cavities enabling access to the bac
part. They are NOT designed for installation on
plinths or floors (see figure).
Caution: installation of the boiler on the wall must
guarantee a stable and efficient support for the gen-
erator. The plugs supplied with the appliance ensure
adequate support only if inserted correctly (accord-
ing to technical standards) in walls comprising bric s
or breeze bloc s, partitions with limited static proper-
ties, or other provided that a static test is performed
to ensure adequate support.
These boilers are used to heat water to below boiling
temperature in atmospheric pressure.
The appliance must be connected to a heating cir-
cuit and domestic water distribution circuit in corre-
spondence to performance and power specifications.
It must also be installed in an ambient temperature
that does not fall below 0°C, and must not be ex-
posed to atmospheric agents.
1.2 Main dimensions.
Key:
G - Gas supply
U - Hot domestic water outlet
E - Domestic water inlet
R - System return
M - System delivery
V - Electrical connection
1BOILER INSTALLATION
1.1 Warnin s.
Immergas gas appliances must be installed exclu-
sively by a professionally qualified and authorised
technician.
Installation must be performed in compliance with
standards UNI and CEI, current legislation and in
observance with local technical standards accord-
ing to a professional code of practice.
The following standards must be observed in par-
ticular: UNI-CIG 7129 and 7131 and CEI 64-8 and
64-9.
Before installing the appliance, ensure that it is de-
livered in perfect condition; if in doubt, contact the
supplier immediately. Pac aging materials (staples,
nails, plastic bags, expanded polystyrene etc.) con-
stitute a hazard and must be ept out of the reach of
children.
If the appliance must be installed inside or between
other cabinets or items of furniture, ensure that suf-
ficient space is left for maintenance; a clearance of
2÷3 cm between the boiler casing and the sides of
the cabinet is recommended. Keep all flammable
objects well away from the appliance (paper, cloths,
plastic, polystyrene, etc.).
In the event of malfunctions, faults or incorrect op-
eration, switch the appliance off immediately and
contact a qualified technician (e.g. from the Immergas
Service centre to ensure use of original spare parts).
Never attempt to modify or repair the appliance alone.
Failure to observe the above implies personal respon-
sibility and renders the guarantee null and void.
YES NO
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058054053
sgnilpuoC
SAG CITSEMOD
RETAW GNITAEH
GUERM
"2/1"2/1"2/1"4/3"4/3

INSTALLER
USER
TECHNICIAN
4
1.3 Connection unit (supplied as standards
with the boiler).
Stora e tanks (in case of feed from LPG tank).
- New LPG storage tan s can contain residuals of
inert gases (nitrogen) which wea en the mixture
delivered to the unit, causing anomalous opera-
tion.
- Due to the composition of the LPG mixture, layer-
ing of the mixture’s components can occur during
the period of storage in the tan s. This can cause
a change in the heating power of the mixture deliv-
ered to the unit, with subsequent variation in its
performance.
Water connection. Before ma ing the connections,
all system piping must be carefully cleaned to re-
move any residuals that could impair boiler efficiency.
In order to prevent scaling in the heating system, the
provisions contained in standard UNI 8065, concern-
ing the treatment of water in heating systems for civil
use, must be complied with. Water connections must
be made in a rational way, using the connections on
the boiler template. The boiler safety valve outlet must
be connected to a discharge funnel. Otherwise, the
manufacturer declines any responsibility in case of
flooding if the drain valve cuts in.
Important: to preserve the life and efficiency of the
domestic circuit exchanger, it is advisable to install
the “polyphosphate proportioner” it in the presence
of water whose characteristics can give rise scale
deposits (in particular, and for example, the it is
recommended when water hardness is higher than
25 degrees French).
Electrical Connection. The Eolo Maior @ boiler is
designed with IPX4D protection rating. Electrical
safety of the unit is guaranteed when correctly con-
nected to an efficient earthing system as specified
by current safety standards.
Caution: Immergas S.p.A. declines all liability for
damage or physical injury caused by failure to con-
nect the boiler to an efficient earthing system or fail-
ure to observe CEI reference standards.
Also ensure that the electrical installation corre-
sponds to maximum absorbed power specifications
as shown on the boiler dataplate.
Boilers are supplied complete with an “X” type power
cable without plug. The power plug must be con-
nected to a 230V±10%-50Hz mains with the correct
pole sequence L-N and the earth connection; the
Key:
R - 3/4" System return
M - 3/4" System delivery
G - 1/2" Gas supply
U - 1/2" Domestic hot
water outlet
E - 1/2" Domestic water
inlet
V - 230V-50Hz Electrical
connection
The it comprises:
2 - 3/4" telescopic fittings
(R-M)
1 - 1/2" telescopic fitting
(U)
1 - 1/2" gas fitting (G)
1 - 1/2" ball valve
(E)
3 - Ø18 copper bend
2 - Ø14 copper bend
2 - adjustable expansion
plugs
2 - boiler support hoo s
Seals and O-Rings
Key:
1 - Gas valve
2 - Biconical ring Ø 18
3-Nut
4 - Gas pipe
Gas connection (Appliance cate ory II2H3+).
Our boilers are built to operate on methane gas (G20)
and LPG. Feed piping must be the same as or larger
than the 1/2"G boiler fitting. Before ma ing the gas
connection, carefully clean inside all the fuel feed
system piping in order to remove any residuals that
could impair good boiler operation. Also ma e sure
the gas corresponds to boiler specifications (see
boiler dataplate). If different, the boiler must be con-
verted for operation with the other type of gas (see
unit conversion in case of gas change). It is also im-
portant to chec the dynamic pressure of the gas
supply (natural gas or LPG) to be used for feeding
the boiler which must conform to UNI EN 437 and
relative attachments, as insufficient pressures can
reduce generator power, causing the user inconven-
iences.
Ensure that the gas coc connection is carried out
correctly, following the assembly sequence shown
in the figure. The gas supply pipe must be suitably
dimensioned according to current standards
(UNI7129) in order to guarantee correct gas delivery
to the boiler even in conditions of maximum genera-
tor output and to guarantee the unit’s performance
(technical data). The coupling system must conform
to standards UNI 7129 and UNI EN 1775.
Gas quality. The unit is designed to operate with
fuel gas free of impurities; otherwise, suitable filters
should be installed ahead of the unit in order to re-
store fuel purity.

TECHNICIAN INSTALLER
USER
5
mains must also be equipped with a multi-pole cir-
cuit brea er with a contact opening gap of at least 3
mm.
In the event of power cable replacement, contact an
authorised technician (e.g. Immergas Technical Serv-
ice).
The power cable must be laid as shown in the figure
below.
In the event of mains fuse replacement on the con-
trol card, use a 3,15A quic blow fuse. For the main
power supply to the appliance, never use adapters,
multiple soc ets or extension leads.
N.W.: when connecting the appliance, if the correct
L-N polarity is not observed the boiler does not de-
tect the flame and inhibits start-up. Also in the same
case, if the neutral is powered with residual voltage
over 30V, the boiler will probably operate, but only
temporarily. Measure the voltage readings with suit-
able tools; avoid the use of mains tester screwdriver.
If the power supply is phase-phase type at 230V, to
guarantee safe conditions equivalent to existing con-
ditions when the boiler is powered with a Phase-Neu-
tral mains, an adaptor it must be fitted on the boiler
for Phase-Phase mains, available on request. Con-
tact an Authorised Immergas Service Centre for in-
stallation of the it.
Timer room thermostats (Optional).
The boiler is designed for use with room thermostats.
These Immergas components are optional available
and provided when requested. All Immergas timer
room thermostats are connectable with 2 wires only.
Read, eeping attention, the instructions for mount-
ing and use, contained in the optional its.
•Digital timer room thermostat on/off. The thermo-
stat gives the following possibility:
- to adjust two different values of room
temperature: one for the day-hours (comfort
temperature) and one for night-hours (reduced
temperature);
- to set until four different wee ly programs for ig-
nitions and switches-off;
- to select the wished operation, choosing between
many possibilities:
•permanent operation at comfort temperature,
•permanent operation at reduced temperature,
•permanent operation at anti-freeze temperature.
The thermostat is supplied by two al aline batter-
ies of 1,5 V type LR6.
•Amico Remote Control with climatic timer room
thermostat functioning. Amico Remote Control
panel allows to the user, besides the functions ex-
plained on the above mentioned point, to control
all overall information about the boiler and the
heating system functioning, having the possibility
to control the boiler comfortably from a distance.
The panel of Amico Remote Control is equipped
with auto-diagnosis system that shows by the dis-
play (through some error-code) any possible
anomaly of the boiler. The timer room thermostat
incorporated in the remote panel, allows to ad-
equate the flow temperature to the radiators in base
of the real necessity of the ambient, in order to
POWER
CABLE
Auxiliary outlet
230V~50Hz
Max. 2A
Power supply
230V~50Hz
Zones P.C.B.
(optional)
Remote
Control
(optional)
Room thermostat
on/ off (optional)

INSTALLER
USER
TECHNICIAN
6
obtain the wished room temperature value with
extreme precision and saving money. The timer
room thermostat is supplied directly by the boiler
with 2 wires, useful for the transmission of data
between boiler and room thermostat.
Electrical connection of Amico Remote Control
and Timer Room Thermostat on/off (Optional).The
operations later on described have to be achieved
after ta en out the power supply of the boiler. The
thermostat or timer room thermostat on/off, has to
be connected on the terminals 40 and 41 removing
the jumper X20 (see the picture page 5). Control that
the contact of Thermostat on/off is of “clean” type,
namely independent from the net tension, if not the
printed control board should be damaged. Amico
Remote Control has to be connected on the termi-
nals 42 and 43 of printed control board, according
the polarity (see the picture page 5). The connection
with inverted polarity doesn’t damage the Amico
Remote Control, but doesn’t allow his functioning.
After the connection is necessary to remove the
jumper X20. The boiler will wor with functions ad-
justed on the Amico Remote Control panel only if
the main switch of the boiler is positioned on Sani-
tary/Amico Remote Control position ( ).
Important: In case of use of Amico Remote Control,
is obligatory to prearrange two separated lines,
according to the local norms concerning electric
plants. Boiler pipelines must never be used to earth
the electrical or telephone lines. Ensure elimination
of this ris before ma ing the boiler electrical con-
nections.
1.4 Installin air intake and flue exhaust termi-
nals.
Immergas supplies various solutions separately from
the boiler for the installation of air inta e and flue
extraction, fundamental for boiler operation.
N.B.: The boiler must be installed exclusively with
an ori inal Immer as air intake and flue extrac-
tion system as specified by standards. This sys-
tem is identifiable by a special identification mark
bearin the note: “not for condensin boilers”.
The flue ducts have not to be near or in contact with
inflammable materials, and they have not to pass
through buildings and walls made of inflammable
materials.
The types of terminals available from Immergas com-
prise:
• Concentric horizontal inta e and exhaust it. This
terminal enables air inta e and exhaust of flues
directly outside the building. The horizontal it can
be installed with a rear outlet, right-hand outlet, left-
hand outlet and front outlet as required (see page
10).
• Concentric vertical air inta e and exhaust it. This
terminal enables vertical air inta e and flue exhaust
directly outside the building (see page 12).
• Separator it (Ø 80/80). This it enables air inta e
to outside the building and flue exhaust via a flue
(see page 13). The central duct is used for flue
exhaust to the flue and the lateral duct is used for
air inta e to outside the building (can be mounted
on left or right side of central duct). Both ducts can
be routed in either direction (see page 13).
• Resistance factors and equivalent lengths. Each
flue extraction system component is designed with
a resistance factor based on preliminary tests and
specified in the table below. The resistance factor
for individual components does not depend either
on the type of boiler on which it is installed or the
actual dimensions. It is based on the temperature
of fluids conveyed through the ducts and therefore
varies according to applications for air inta e or
flue exhaust. Each component has a resistance
corresponding to a specific length in metres of pipe
with the same diameter; the so-called equivalent
length, based on the ratio between different resist-
ance factors, for example : Ø80 90° bend; resist-
ance factor on inta e 5; 1-metre Ø80 pipe; resist-
ance factor on inta e 2.3; equivalent length of 90°
Ø80 bend = 5: 2.3 = 2.2 m of Ø80 pipe on inta e.
In the same way each component has a resistance
factor corresponding to a specific length in metres
of a pipe with a different diameter, for example a
concentric 90° bend Ø60/100 Resistance Factor
21; pipe Ø80 m1 on exhaust, Resistance Factor =
3; Equivalent length of 90° bend Ø60/100 = 21 : 3 =
7 m of Ø80 pipe on exhaust. All boilers have a maxi-
mum resistance factor based on testing at 100. The
maximum admissible resistance factor corresponds
to the resistance detected with the maximum ad-
missible pipe length with each type of Terminal Kit
installed. This information enables calculations to
verify the possibility of various configurations of flue
extraction systems.

TECHNICIAN INSTALLER
USER
7
Resistance Factors and Equivalent Len ths.
DUCT TYPE
Resistance
Factor
(R)
Equivalent length in
metres of concentric
pipe Ø 60/100
Equivalent length in
metres of concentric
pipe Ø 80/125
Equivalent length in
metres of pipe Ø 80
Concentric pipe Ø 60/100 1 m
90° bend concentric Ø 60/100
45° bend concentric Ø 60/100
Terminal complete with concentric horizontal
inta e-exhaust Ø 60/100
Concentric pipe Ø 80/125 m 1
90° bend concentric Ø 80/125
Inta e
and
exhaust
16.5
m 1
Inta e
7.1m
Inta e
and
exhaust
21
m 1,3
Inta e
9.1m
Inta e
and
exhaust
16.5
m 1
Inta e
m 7.1m
Inta e
and
exhaust
46
m 2,8
Inta e
m 20m
Inta e
and
exhaust
6
m 0,4
Inta e
2.6m
Inta e
and
exhaust
7.5
m 0,5
Inta e
3.3m
Exhaust
5.5 m
Exhaust
7.0m
Exhaust
m 5.5m
Inta e
m 14m
Exhaust
2.0m
Exhaust
2.5m
m 2,8
m 3,5
m 2,8
Exhaust
m 15m
m 7,6
Exhaust
10.6m
m 5,3
m 1,9
Inta e
and
exhaust
32
Terminal complete with concentric horizontal
inta e-exhaust Ø 60/100
m 1,0
m 1,3
45° bend concentric Ø 80/125 Inta e
and
exhaust
6
m 0,4
Inta e
2.6m
Exhaust
2.0m
m 1,0
Terminal complete with concentric vertical inta e-
exhaust Ø 80/125
Inta e
and
exhaust
33
Inta e
14.3m
Exhaust
11.0m
m 2,0 m 5,5
Terminal complete with concentric vertical inta e-
exhaust Ø 80/125
m 1,6
Inta e
11.5m
Exhaust
8.8m
Inta e
and
exhaust
26.5
m ,

INSTALLER
USER
TECHNICIAN
8
DUCT TYPE
Resistance
factor
(R)
Equivalent length in
metres of concentric
pipe Ø 60/100
Equivalent length in
metres of concentric
pipe Ø 80/125
Equivalent length in
metres of pipe
Ø 80
Concentric adapter from Ø 60/100
to Ø 80/125 with condensate collector
Inta e
5.6 m
Exhaust
4.3 m
Pipe Ø 80 m 1
(with or without insulation)
Intake
1.0 m
Inta e terminal Ø 80
Exhaust terminal Ø 80
Intake
2.2 m
Intake
1.3 m
90°bend Ø 80 Inta e
50.3 m 0.8 m Intake
2.2 m
Exhaust
6,5 0.4 m 1.1 m Exhaust 2.1 m
45° bend Ø 80 Inta e
30.2 m 0.5 m Intake
1.3 m
Exhaust
40.2 m Exhaust
1.3 m
0.6 m
Exhaust
1.0 m
0.8 m
Inta e
and
exhaust
13
Complete inta e terminal Ø 80 m 1
(with or without insulation)
0.4 m
0.5 m
Inta e
2,3
Exhaust
3
0.8 m
Inta e
5
0.5 m
Inta e
30.2 m
0.3 m
0.2 m
0.1 m
2.2 m
Sdoppiato parallelo Ø 80
da Ø 60/100 a Ø 80/80
Intake
3.8 m
Exhaust
2,9 m
0.5 m
Inta e
and
exhaust
8.8
1.5 m
2.3 m
Inta e
16.9 m
Exhaust
13 m
Inta e
and
exhaust
39
Terminal complete with concentric horizontal
inta e-exhaust Ø 80/125 6.5 m
Inta e
14.8 m
Exhaust
11.3 m
Concentric adapter from
Ø 60/100 to Ø 80/125 Inta e
0.8 m
Exhaust
0.6 m
Terminal complete with concentric horizontal
inta e-exhaust Ø 80/125 2.0 m
Inta e
and
exhaust
34
0.1 m
Inta e
and
exhaust
2
5.6 m
0.3 m
Resistance Factors and Equivalent Len ths.
Exhaust
0.8 m
0.4 m
Exhaust
2.5 0.1 m
Terminal complete with concentric vertical inta e-
exhaust Ø 60/100 Inta e
18 m
7 m2.5 m
Exhaust
14 m
Inta e
and
exhaust
41.7

TECHNICIAN INSTALLER
USER
9
DIAPHRAGM Duct length in metres
Ø 60/100 horizontal
Ø 46
Ø 48
From 0 to 1
From 1 to 2
Over 2
NONE
DIAPHRAGM Duct length in metres
Ø 60/100 vertical
Ø 46
Ø 48
From 0 to 2.7
From 2.7 to 3.7
NONE Over 3.7
DIAPHRAGM *Duct length in metres
Ø 80 horizontal duct with two
bends
Ø 46
Ø 48
NONE
From 0 to 20
From 20 to 26
Over 26
DIAPHRAGM Duct length in metres
Ø 80/125 horizontal
Ø 46
Ø 48
NONE
From 0 to 1.9
From 1.9 to 4.6
Over 4.6
DIAPHRAGM Duct length in metres
Ø 80/125 vertical
Ø 46
Ø 48
From 0 to 6.8
From 6.8 to 9.5
NONE Over 9.5
DIAPHRAGM *Duct length in metres
Ø 80 vertical duct without
bends
Ø 46
Ø 48
From 5 to 25
From 25 to 33
NONE Over 33
From 0 to 5
Ø 42,5
Eolo 21 Maior @ diaphra m table. Eolo 24 Maior @ diaphra m table.
DIAPHRAGM Duct length in metres
Ø 60/100 horizontal
Ø 44
Ø 47
From 0 to 1
From 1 to 2
Over 2
NONE
DIAPHRAGM Duct length in metres
Ø 60/100 vertical
Ø 44
Ø 47
From 0 to 2.7
From 2.7 to 3.7
NONE Over 3.7
DIAPHRAGM Duct length in metres
Ø 80/125 horizontal
Ø 44
Ø 47
NONE
From 0 to 1.9
From 1.9 to 4.6
Over 4.6
DIAPHRAGM Duct length in metres
Ø 80/125 vertical
Ø 44
Ø 47
From 0 to 6.8
From 6.8 to 9.5
NONE Over 9.5
DIAPHRAGM *Duct length in metres
Ø 80 horizontal duct with two
bends
Ø 44
Ø 47
NONE
From 0 to 16
From 16 to 28
Over 28
DIAPHRAGM *Duct length in metres
Ø 80 vertical duct without
bends
Ø 44
Ø 47
From 5 to 21
From 21 to 33
NONE Over 33
From 0 to 5
Ø 41,5

INSTALLER
USER
TECHNICIAN
10
Diaphra m installation. To ensure correct opera-
tion of the boiler, a diaphragm (see figure) must be
installed on output of the sealed chamber before the
inta e and exhaust duct. Selection of a suitable dia-
phragm depends on the type of ducting used and
maximum length: calculations can be made using
the values in the tables:
N.W.: Diaphragms are supplied as standard with the
boiler.
*The values for maximum length are considered with
1 metre of exhaust pipe and the remaining on in-
ta e.
Horizontal intake-exhaust kit Ø60/100. Kit assem-
bly: install the bend with flange (2) on the central
hole of the boiler ta ing care to insert the seal (1)
and secure by means of the screws supplied with
the it. Join the male end (smooth section) of termi-
nal pipe (3) to the female section (with lip-seal) of
bend (2) to the end stop and ensure that the internal
and external washers are fitted to achieve perfect
sealing of all couplings.
• Snap-fit couplings of concentric pipes or extensions
and elbow fittings Ø60/100. To install extension
Eolo 27 Maior @ diaphra m table.
Ø 45
NONE
From 0 to 1
Over 1
DIAPHRAGM Duct length in metres
Ø 60/100 horizontal
Ø 45
NONE
From 0 to 2,7
Over 2,7
DIAPHRAGM Duct length in metres
Ø 60/100 vertical
Ø 45
NONE
From 0 to 1,9
Over 1,9
DIAPHRAGM Duct length in metres
Ø 80/125 horizontal
Ø 45
NONE
From 0 to 6,8
Over 6,8
DIAPHRAGM Duct length in metres
Ø 80/125 vertical
Ø 45
NONE
From 0 to 20
Over 20
DIAPHRAGM *Duct length in metres
Ø 80 horizontal duct with two
bends
Ø 45
NONE
From 0 to 25
Over 25
DIAPHRAGM *Duct length in metres
Ø 80 vertical duct without
bends
The it comprises:
2 - Seal (1)
1 - Concentric 90° bend
(2)
1 - Inta e/Exh. concentric
pipe Ø60/100 (3)
1 - Internal washer (4)
1 - External washer (5)
DIAPHRAGM
Positionin of double-lip seals. For correct posi-
tioning of the lip seals on elbows and extensions,
follow the order of assembly shown in the figure.

TECHNICIAN INSTALLER
USER
11
Connection with 1 extension. Max. distance be-
tween vertical boiler axis and external wall: 1855
mm.
Connection with 2 extensions. Max. distance be-
tween vertical boiler axis and external wall 2805.
Horizontal intake-exhaust kit Ø 80/125. Kit assem-
bly: install the bend with flange (2) on the central
hole of the boiler ta ing care to insert the seal (1)
and tighten with the screws supplied in the it. Fit
the adapter (3) with the male section (smooth) in the
female section of the bend (2) (with lip seal) to the
end stop. Fit the concentric terminal Ø 80/125 (4)
with the male section (smooth) in the female section
of the adapter (3) (with lip seal) to the end stop, en-
suring that the internal and external washers are fit-
ted to ensure sealing efficiency of all couplings.
• Snap fit extension pipe fittings and concentric el-
bows Ø 80/125. To install snap-fit extensions with
other elements of the boiler assembly, proceed as
follows: fit the concentric pipe or elbow with the
male section (smooth) on the female section (with
lip seal) to the end stop on the previously installed
to ensure sealing efficiency of the coupling.
Caution: if the exhaust terminal and/or extension
concentric pipe needs shortening, consider that the
internal duct must always protrude by 5 mm with re-
spect to the external duct.
Normally the horizontal inta e/exhaust it Ø 80/125
is used in the event of using particularly long exten-
sions; the it Ø 80/125 can be installed with a rear,
right-hand, left-hand or front outlet.
• Extensions for horizontal it. The horizontal inta e/
exhaust it Ø 80/125 can be extended up to a
couplings on other flue extraction components, pro-
ceed as follows: fit the concentric pipe or concen-
tric elbow with the male section (smooth) on the
female section (with lip-seal) of the previously in-
stalled component to the end stop to ensure per-
fect sealing of the coupling.
The horizontal inta e-exhaust it Ø 60/100 can be
installed with a rear, right-hand, left-hand, or front
outlet as required.
• Application with rear outlet. The 970 mm pipe length
enables partial routing through a maximum thic -
ness 728 mm. Normally the terminal should be
shortened. Calculate the distance by adding the
following: Part thic ness + internal protrusion + ex-
ternal protrusion. Minimum protrusion values are
given in the figure below.
• Application with lateral outlet; using the horizontal
inta e-exhaust it only, without the special
extensions, enables routing through a wall
thic ness of 905 mm.
• Extensions for horizontal it. The horizontal inta e-
exhaust it Ø 60/100 can be extended up to a max.
horizontal distance of 3000 mm including the grille
terminal and excluding the concentric bend on out-
put of the boiler. This configuration corresponds to
a resistance factor of 100. In this case special ex-
tensions must be requested.
The it comprises:
2 - seal (1)
1 - Concentric bend
Ø 60/100 (2)
1 - Adapter Ø 60/100 for Ø
80/125 (3)
1 - Concentric Int./Exh.
bend Ø 80/125 (4)
1 - Internal washer (5)
1 - External washer (6)

INSTALLER
USER
TECHNICIAN
12
maximum horizontal length of 7300 mm including
the terminal grille and excluding the concentric
bend on output of the boiler and the adapter Ø 60/
100 in Ø 80/125 (see figure page 12). This con-
figuration corresponds to a resistance factor of
100. In these cases specific extensions must be
requested.
N.W.: when installing the ducts, a section clamp
with pin must be installed every 3 metres.
• External grille. The inta e/exhaust terminal mod-
els Ø 60/100 and Ø 80/125, if correctly installed,
blend with external building aesthetics. Ensure that
the silicon washer is fitted snugly against the ex-
ternal wall.
N.W.: for safety purposes, do not totally or partially
obstruct the boiler inta e/exhaust terminal even
temporarily.
Vertical kit with aluminium tile Ø 80/125. Kit as-
sembly: install the concentric flange (2) on the cen-
tral hole of the boiler ta ing care to insert the seal (1)
supplied with the it and tighten by means of the
screws supplied with the boiler. Fit the male section
(smooth) of the adapter (3) coin the female section
of the concentric flange (2). Installing the imitation
aluminium tile. Replace the tile with the aluminium
sheet (5), shaping it to ensure off-flow of rainwater.
Position the fixed half-shell (7) on the aluminium tile
and insert the inta e/exhaust pipe (6). Fit the con-
centric terminal Ø 80/125 with the male section (6)
(smooth), in the female section of the adapter (3)
(with lip seal) to the end stop, ensuring that washer
(4) si already fitted to ensure sealing efficiency of all
couplings.
• Snap fit extension pipe fittings and concentric el-
bows Ø 80/125. To install snap-fit extensions with
other elements of the boiler assembly, proceed as
follows: fit the concentric pipe or elbow with the
male section (smooth) on the female section (with
lip seal) to the end stop on the previously installed
to ensure sealing efficiency of the couplings.
Caution: if the exhaust terminal and/or extension
concentric pipe needs shortening, consider that the
internal duct must always protrude by 5 mm with re-
spect to the external duct.
This specific terminal enables flue exhaust and air
inta e in a vertical direction.
N.W.: the vertical it Ø 80/125 with aluminium tile
enables installation on terraces and roofs with maxi-
mum gradient of 45% (24°) and the height between
the terminal cap and half-shell (374 mm) must be
strictly observed.
This vertical it configuration can be extended to a
maximum length of 12200 mm in a vertical straight
route, including the terminal (see figure below). This
configuration corresponds to a resistance factor of
100. In this case specific extensions must be re-
quested.
Terminal Ø 60/100 can also be used for vertical ex-
haust, in conjunction with concentric flange code no.
3.011141 (sold separately). height between the ter-
minal cap and half-shell (374 mm) must be strictly
observed (see drawing below).
This vertical it configuration can be extended to a
maximum length of 4700 mm in a vertical straight
line, including the terminal (see figure below).
MAX. LENGTH 4700 mm
MAX. LENGTH 12200 mm
The it comprises:
2 - Seal (1)
1 - Female concentric flange
(2)
1 - Adapter Ø 60/100 for Ø
80/125 (3)
1 - Washer(4)
1 - Aluminium tile (5)
1 - Int./Exh. concentric pipe
Ø 80/125 (6)
1 - Fixed half-shell (7)
1 - Mobile half-shell (8)

TECHNICIAN INSTALLER
USER
13
Separator kit Ø 80/80. The separator it Ø 80/80,
enables the division of the flue exhaust pipes and air
inta e pipes according to the diagram shown in the
figure. Combustion products are expelled from duct
(A). Air is ta en in through duct (B) for combustion.
Inta e duct (B) can be installed either on the right or
left hand side of the central exhaust duct (A). Both
ducts can be routed in any direction.
• Assembly of separator it Ø 80/80. Install flange
(4) on the central hole of the boiler ta ing care to
insert seal (1) supplied with the it and tighten by
means of the screws on the boiler. Remove the
flat flange on the lateral hole (depending on instal-
lation requirements) and replace with flange (3)
inserting seal (2) already fitted on the boiler and
tighten with the screws supplied. Joins bends (5)
with the male section (smooth) in the female section
of the flanges (3 and 4). Fit the inta e terminal (6)
with the male section (smooth) in the female section
of the flange (5) to the end stop with the internal
and external washers inserted. Join the exhaust
pipe (9) with the male section (smooth) in the
female section of the bend (5) to the end stop
ensuring that the internal washer is fitted and to
ensure sealing efficiency of the couplings.
• Snap fit extension pipe fittings and elbows. To in-
stall snap-fit extensions with other elements of the
boiler assembly, proceed as follows: fit the pipe or
elbow with the male section (smooth) on the fe-
male section (with lip seal) to the end stop on the
previously installed to ensure sealing efficiency of
the couplings.
• Installation clearances. The following figure shows
the minimum installation clearances for the termi-
nal separator it Ø 80/80 in maximum admissible
conditions.
• Extension for separator it Ø 80/80. The maximum
straight length (without bends) on a vertical route,
for inta e and exhaust pipes Ø80 is 41 metres, 40
of which on inta e and 1 on exhaust. This total
length corresponds to a resistance factor of 100.
The total effective length, obtained by adding the
length of inta e and exhaust pipes Ø 80 must not
exceed the maximum values specified in the table
below. If mixed accessories 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 the resistance factor for each
component or the equivalent length. The total of
the resistance factors must not exceed 100.
• Temperature drops in flue ducts. To avoid the prob-
lem of flue condensation in the exhaust pipe Ø 80,
due to cooling through the walls, the length of the
duct must be restricted to within 5 metres. If longer
distances have to be covered, use pipe diameters
Ø 80 with insulation (see insulated separator it Ø
80/80).
The it comprises:
2 Seal (1)
1 - Female inta e
flange (3)
1 - Flange seal (2)
1 - Female exhaust
flange (4)
2 - 90° bend Ø 80 (5)
1 - Inta e terminal Ø 80
(6)
2 - Internal washers (7)
1 - External washer (8)
1 - Exhaust pipe Ø 80 (9)
A = EXHAUST
B= INTAKE

INSTALLER
USER
TECHNICIAN
14
N.W.: when installing the Ø 80 ducts, a section clamp
with pin must be installed every 3 metres.
Insulated separator kit Ø 80/80. Kit assembly: In-
stall flange (4) on the central hole of the boiler ta -
ing care to insert seal (1) supplied with the it and
tighten by means of the screws on the boiler. Re-
move the flat flange on the lateral hole (depending
on installation requirements) and replace with flange
(3) inserting seal (2) already fitted on the boiler and
tighten with the screws supplied. Insert and slide cap
(6) onto bend (5) on the male section (smooth) and
join bends (5) with the male section (smooth in the
female section of flange (3). Fit bend (10) with the
male section (smooth) in the female section of flange
(4). Join the inta e terminal (7) with the male section
(smooth in the female section of bend (5) to the end
stop, ensuring that washers (8) are inserted to
achieve correct installation between the pipe and wall
and fit the end cap (6) on terminal (7). Join the ex-
haust pipe (9) with the male section (smooth) in the
female section of the bend (10) to the end stop, en-
suring that the washer (8) is already inserted for cor-
rect installation between the pipe and flue. • Snap fit extension pipe fittings and elbows. To in-
stall snap-fit extensions with other elements of the
boiler assembly, proceed as follows: fit the con-
centric pipe or elbow with the male section (smooth)
36.0*
INSULATED DUCT
Maximum effective lengths
(including inta e terminal with grille and two 90° bends)
Inta e (metres)
NON-INSULATED DUCT
Exhaust (metres) Inta e (metres) Exhaust (metres)
29.5*
16
28.0*
234.5* 7
26.5*
333.0* 8
25.5*
432.0* 9
24.0*
530.5* 10
22.5*
11
21.5*
12
*The inta e duct can be increased by 2.5 metres if
the bend on exhaust is eliminated, 2 metres if the
inta e bend is eliminated or 4 metres of both bends
are removed.
The it comprises:
2 - Seal (1)
1 - Flange seal (2)
1 - Female inta e flange (3)
1 - Female exhaust flange (4)
1 - 90° bend Ø 80 (5)
1 - Pipe end cap (6)
1 - Insulated inta e terminal Ø 80 (7)
3 - Washers (8)
1 - Insulated exhaust pipe Ø 80 (9)
1 - Concentric 90° bend Ø 80/125 (10)
A= EXHAUST
B = INTAKE

TECHNICIAN INSTALLER
USER
15
on the female section (with lip seal) to the end stop
on the previously installed to ensure sealing effi-
ciency of the couplings.
• Insulation of separator terminal. In the event of
problems of condensation of flues inside the ex-
haust pipes or on the outside surface of the inta e
pipes, on request Immergas supplies insulated in-
ta e and exhaust pipes. Insulation may be neces-
sary on exhaust pipes due to excessive drops in
temperature of flues during conveyance from the
boiler and on the inta e pipes as air on input (cold)
may cause the external pipe temperature lower
than the dew point of the ambient air. The figures
below illustrate different applications of insulated
pipes.
Insulated pipes comprise an internal Ø 80 concen-
tric pipe and a Ø 125 external pipe with static air
jac et. Technically it is not possible to start with
both Ø 80 elbows insulated as clearances will not
allow this type of installation. However an insulated
elbow can be used by selecting either the inta e
or exhaust pipe. If an insulated inta e pipe is used,
the flange must be inserted to the end stop on the
flue extraction flange to ensure that the height of
the two inta e and exhaust outlets is aligned.
• Temperature loss in insulated ducting. To avoid the
problem of flue condensation in insulated exhaust
Ø 80 pipes, due to cooling via the wall, the ex-
haust pipe length must be restricted to 12 metres.
The figure above illustrates a typical insulation ap-
plication in which the inta e pipe is short and the
exhaust pipe very long (over 5 m). The entire in-
ta e pipe is insulated to prevent condensation of
humid air in the boiler environment in contact with
the cooled pipe conveying cool outdoor air. The
entire exhaust pipe is insulated with the exception
of the elbow on output of the splitter, to reduce heat
dispersion from the duct and prevent formation of
flue condensate.
N.W.: when installing the insulated ducts, a sec-
tion clamp with pin must be installed every 2 me-
tres.
1.5 Flue exhaust via flues.
Flue exhaust does not necessarily have to be con-
nected a branched type traditional flue and can be
connected to a special LAS type multiple flue. Flues
must be specially designed according to specifica-
tions in the standard by qualified professional
personnel.
Chimney or flue sections for connection of the ex-
haust pipe must comply with requirements as laid
down in standards.
1.6 Existin ductin flues.
With a specific “ducting system” it is possible to re-
use existing flues, chimneys and technical slots to
discharge the boiler fumes. Ducting requires the use
of ducts declared suitable for the purpose by the
manufacturer, following the installation and opera-
tion instructions provided by the manufacturer, and
the requirements of UNI 10845 standard.

INSTALLER
USER
TECHNICIAN
16
1.7 Chimneys/Flues.
General notes. A chimney/flue used to exhaust com-
bustion products must be designed as follows:
-ducting must ensure sealing of combustion prod-
ucts, be waterproof and insulated;
- construction in incombustible material suitable to
resist normal mechanical stress, heat and action
of combustion products or condensation;
- ducting routed vertically without reductions/throt-
tles;
- adequate insulation to avoid condensation or cool-
ing of flue gas, in particular if installed outside the
building or in rooms without heating;
- be adequately spaced, or, be fitted with an air jac et
for insulation from zones with combustible and/or
easily flammable materials;
-installation of a solid materials collection unit be-
low the first flue channel at a height of at least
500mm, fitted with a metal airtight door;
- designed with an internal circular, square or rec-
tangular section (in that latter two cases with
rounded angles with a radius no less than 20 mm).
Hydraulically equivalent sections are also admit-
ted;
- installation of a chimney terminal at the top of the
flue in compliance with specifications below and in
compliance with standards;
- without mechanical suction devices installed at the
top of the duct;
- in flues routed inside or against inhabited build-
ings, there must be no ris of pressure surges.
Chimney caps. These devices are installed on sin-
gle or multiple flues, to facilitate dispersion of com-
bustion products also in adverse weather conditions
and prevent deposit of foreign matter. Chimney caps
must meet the following requirements:
- useful output section no less than double that of
the flue/chimney;
- suitably designed to prevent penetration of rain or
snow in the flue/chimney;
- designed to ensure constant exhaust of combus-
tion products with any direction or angle of wind.
The outlet height, corresponding to the height of the
top of the flue/chimney, regardless of chimney caps,
must be outside the “bac flow zone”, to avoid the
ris of counterpressure that prevents the free release
of combustion products into the atmosphere. There-
fore always observe the minimum heights indicated
in the figures in standards.
Positionin the draft terminals. Draft terminals
must:
- be installed on external perimeter walls of the build-
ing;
- be positioned (see figure) according to the mini-
mum distances specified in current technical
standards.
Fumes exhaust on natural drau ht appliances in
open top closed environments. In spaces closed
on all sides with open tops (ventilation pits, light wells,
inner courtyards, etc.), direct discharge of fumes is
allowed for natural or forced draught gas appliances
with a heat output from 4 to 35 W, provided the speci-
fications of current technical standardsare complied
with (UNI 7129 par. 4.7).
1.8 System fillin .
Once the boiler is connected, proceed with system
filling via the filling valve (see figure page 20).
Filling is performed at low speed to ensure release
of air bubbles in the water via the boiler and heating
system vents.
The boiler is equipped with an automatic air vent
positioned on the expansion vessel, that is in the rear
side of combustion sealed chamber. Chec that the
cap is loosened and open the vent valves on the ra-
diators and close only when water is delivered.
Close the filling valve when the boiler pressure gauge
indicates approx. 1,2 bar.
N.W.: During this operation, activate the circulation
pump at regular intervals by means of the main switch
on the control panel. Vent the circulation pump by
loosening the front cap and eeping the motor run-
ning.
Tighten the cap on completion.
1.9 Gas system start-up.
To start up the system proceed as follows:
- open windows and doors;
- avoid presence of spar s or na ed flames;
- vent all air from pipelines;
- chec gas inta e sealing efficiency with the boiler
gas shutoff valve closed, chec ing that there is no
gas transfer for at least 10 minutes.
1.10 Boiler start-up (i nition).
The following conditions are required for boiler start-
up:
- ensure gas inta e sealing efficiency with the shutoff
valves closed and subsequently open with gas
valve closed over an interval of 10 minutes in which

TECHNICIAN INSTALLER
USER
17
no gas transfer must be detected by the meter;
- ensure that the type of gas used corresponds to
boiler settings;
- switch on the boiler and ensure correct ignition;
- ensure that the gas flow rate and pressure values
correspond to manual specifications (see page 30-
31);
- ensure that the safety device is engaged in the
event of gas supply failure and chec activation
time;
- chec activation of the main circuit-brea er switch
upstream of the boiler and on the unit;
- chec that the concentric inta e/exhaust terminal
(if fitted) is not bloc ed.
The boiler must not be started up in the event of fail-
ure to comply with any of the above.
Preliminary boiler testing must be performed by quali-
fied personnel (e.g. free of charge by an Authorised
Immergas Service Centre). The boiler guarantee is
valid as of the date of testing.
System pump head Eolo 21 Maior @.
Head in mmw.g.
A
B
Flow rate Litres/h
C
D
The test certificate and guarantee is issued to the
user on completion.
1.11 Circulation pump.
Eolo Maior @ boilers are supplied with a built-in cir-
culation pump with 3-position electric speed control.
If the circulating pump is adjusted on the first speed,
the boiler doesn’t operate correctly.
To ensure optimal boiler operation, in the case of
new systems (single pipe and modul) use the circu-
lation pump at maximum speed (third setting). The
circulation pump is already fitted with a capacitor.
Pump release (when required). After a prolonged
period of disuse, if the pump is bloc ed, loosen the
front cap and rotate the motor using a screwdriver.
Ta e great care during this operation to avoid dam-
age to the motor.
A = Head available on third speed
setting
B = Head available on second
speed setting
C = Head available on third speed
setting with by-pass inserted
D = Head available on second
speed setting with by-pass
inserted

INSTALLER
USER
TECHNICIAN
18
A
B
D
C
Flow rate Litres/h
Head in mmw.g.
System pump head Eolo 27 Maior @.
A = Head available on third speed
setting
B = Head available on second
speed setting
C = Head available on third speed
setting with by-pass inserted
D = Head available on second
speed setting with by-pass
inserted
A
B
DC
System pump head Eolo 24 Maior @.
Flow rate Litres/h
Head in mmw.g.
A = Head available on third speed
setting
B = Head available on second
speed setting
C = Head available on third speed
setting with by-pass inserted
D = Head available on second
speed setting with by-pass
inserted

TECHNICIAN INSTALLER
USER
19
1.12 Eolo 21-24 Maior @ boiler components.
Key:
1 - Air/flue inta e soc ets (A air) - (F flue)
2 - Fan safety pressure switch
3 - Flue extraction fan
4 - Domestic hot water NTC thermistor
5 - Gas valve
6 - Draining valve
7 - Central heating filling valve
8 - Automatic air vent valve
9 - Sealed chamber
10 - Expansion vessel
11 - Central heating NTC thermistor
12 - Over heat safety thermostat
13 - Combustion chamber
14 - Circulating pump
15 - Water pressure switch
16 - Plated heat exchanger
17 - 3 bar safety valve
18 - Automatic by-pass exclusion stem
19 - 3 way hydraulic valve
20 - Positive signal pressure soc et
21 - Negative signal pressure soc et
22 - Flue hood
23 - Primary heat exchanger
24 - Ignition / detection electrodes
25 - Burner