Immergas MAIOR EOLO 4 E Series Guide

MAIOR EOLO 4 E
Instantaneous wall-hung
boilers, sealed-room
with "Aqua Celeris" system
MAIOR EOLO 4 E

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MAIOR EOLO 24-28-32 4 E
Wall-mounted boiler with fan-assisted sealed
combustion chamber for central heating and
instantaneous domestic hot water production,
equipped with AQUA CELERIS system
MAIOR EOLO 24 4 E
MAIOR EOLO 28 4 E
MAIOR EOLO 32 4 E
MAIOR EOLO 4 E is a wall-mounted, sealed chamber,
fan-assisted generator (type C) for central heating and the
production of domestic hot water.
e boiler can be installed according to conguration B22 using
the relevant kit (optional).
e boilers in the MAIOR EOLO 4 E range are approved for
installation outside buildings in a partially protected location.
N.B.: A partially protected location is a place where the appliance
is not exposed to the direct eects of the weather (rain, snow, hail,
etc...).
e appliance is available with eective outputs of 24 kW
(20.640 kcal/h), 28 kW (24.080 kcal/h) and 32 kW (27.520
kcal/h).
Adjustment and control are entrusted to an integrated P.C.B.
with micro processor with continuous ame modulation by
means of 2 sensors (domestic water and central heating).
e new electronics allow the new Comando Amico Remoto
remote control (CAR V2) to be connected so that the boiler
can be managed and controlled remotely with extreme ease;
it is also designed for systems that are subdivided into zones
and to be connected to the new Multi-system Distribution
Manifolds (DIM V2).
e boiler has a standard anti-freeze safety devicethat protects
it to a minimum temperature of -5°C (optional to -15°C).
e hydraulic circuit has a bronze water-gas heat exchanger
and uses a new multi-purpose hydraulic unit made from
composite material (ICHS) which houses the pump and
3-way electric valve that allow the boiler water to circulate in
the CH system or in a STAINLESS steel plate heat exchanger
General features
for the instantaneous production of DHW according to
necessity, as well as the hydraulic circuit control devices
(absolute system pressure switch, adjustable system by-pass, 3-bar
calibrated system safety valve, etc.).
A domestic water ow switch allows the boiler to be activated
when domestic hot water is requested.
The range features the "Aqua Celeris" system, which
drastically reduces wait times for domestic hot water supply.
e boiler is deisgned to receive pre-heated water from a solar
storage tank; by activating this function through the boiler
parameters, the burner and the boiler turn on only if necessary
in order to reach the set domestic hot water set point.
e intake of combustion air inside the sealed chamber and
ue extraction are ensured by a fan which is guaranteed to
operate correctly by means of a dierential ue pressure switch.
e parameters to operate the boiler can be set by rotating
the knobs where you can view the operating status, mode and
anomalies that have occured using a digital interface with an
easy-to-read backlit display screen, located in the centre of
the dashboard.
e appliance has an IPX5D electric insulation rating: this
means that the boiler is protected against jets of water and
high humidity levels.

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Main MAIOR EOLO measurements and connections
Key:
V - Electrical connection
G - Gas supply
AC - Domestic hot water outlet
ACV- Solar valve kit DHW inlet
(Optional)
AF - Domestic cold water inlet
R - System return
M - System ow
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”
N.B.: connection group (optional)

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MAIOR EOLO controls panel
Key:
1 - Heating temperature selector
2 - Domestic hot water temperature
selector
3 - On/Stand-by/O Button
4 - Summer/Winter Button
5 - Reset Button
6 - Boost Button for Aqua Celeris
activation
7 - Operation in summer mode
8 - Boiler in Stand-by mode
9 - Operation in winter mode
10 - Blocked boiler, it needs to be
unblocked by pressing the “RESET”
button
11 - Flame presence symbol and relative
output scale
12 - Central heating room phase function
active
13 - Solar function active
14 - Anomaly present
15 - Chimney sweep function in progress
16 - DHW production phase function
active
17 - Domestic hot water temperature set
18 - Boiler connected toV2 remote
control (optional)
19 - Operation with external
temperature probe active (optional)
20 - Aqua Celeris function active
21 - Central heating temperature set
22 - Boiler manometer

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Main MAIOR EOLO parts
Key:
1 - Sample points (air A) - (ue gases 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 - Flue hood
14 - Safety thermostat
15 - Primary heat exchanger
16 - Ignition and detection electrode
17 - System expansion vessel
18 - Aqua Celeris
19 - Burner
20 - System pressure switch
21 - Air vent valve
22 - Boiler pump
23 - Plate heat exchanger
24 - 3-way valve (motorised)
25 - System draining valve
26 - By-pass
27 - 3 bar safety valve
N.B.: connection group (optional)

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e hot water used for central heating and domestic hot water
is produced via a primary and a secondary circuit (DHW)
which are aected according to necessity.
MAIOR EOLO hydraulic diagram
Key:
1 - Domestic hot water ow switch
2 - System lling valve
3 - Flow limiter
4 - Domestic hot water probe
5 - Aqua Celeris Resistance
6 - Gas valve
7 - Aqua Celeris
8 - System expansion vessel
9 - Burner
10 - Primary heat exchanger
11 - Flue hood
12 - Sealed chamber
13 - Flue pressure switch
14 - Fan
15 - Flow probe
16 - Safety thermostat
17 - Air vent valve
18 - Boiler pump
19 - System draining valve
20 - System pressure switch
21 - Plate heat exchanger
22 - 3-way valve (motorised)
23 - By-pass
24 - 3 bar safety valve
G - Gas supply
AC - Domestic hot water outlet
AF - Domestic hot water inlet
R - System return
M - System ow

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Primary circuit (boiler circuit).
e primary circuit, with relative control and safety devices,
starts up every time there is a central heating or domestic
hot water request.
How it works (see MAIOR EOLO)
e heat contained in the ue produced by combustion is
absorbed by the copper blades of the water-air heat exchanger
(10) which, then transfers the heat to the water that circulates
inside by the boiler pump (18).
e water is either sent directly into the system or it can be
deviated inside the STAINLESS steel instantaneous plate heat
exchanger (21).
Head (kPa)
Flow rate Litres/h
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.
Head (m H2O)
MAIOR EOLO 24
Head (kPa)
Flow rate Litres/h
Head (m H2O)
MAIOR EOLO 28
is depends on the position of the 3-way motorised valve (22),
which allows ow towards the domestic water heat exchanger
(21) in its resting position, or deviates it towards the ow (M)
and return (R) pipes following a request for central heating.
Head-ow rate graphics
e progress of the curve that represents the ow rate-head ratio
available to the system depends on the operating speed of the
pump and adjustment of the system by-pass which, according
to the position, allows you to set more or less head on the
system. e graph below illustrates the characteristic curves.
A
B
C
D
A
B
C
D

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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.
MAIOR EOLO 32
Head (m H2O)
Head (kPa)
Flow rate Litres/h
A
B
C
D

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Boiler pump (1)
Operates on the primary circuit return. It is part of the pump
body unit made with composite material.
ere is a seat built into the body where the automatic air
vent valve (2) is housed with O-ring sealing.
To remove the air vent valve from the pump body, turn the
valve counter-clockwise by a quarter turn.
Primary Exchanger (1)
is is a lamellar water-gas heat exchanger with bronze pipes
and ns that have the central heating ow NTC probe (6)
and the overheating safety thermostat (2) positioned on their
outlet (ow).
e four pipes that it is made of are connected in series (1).
It is connected to the pump ow and to the primary circuit
ow using push-tting pipes (3) with O.R. seal (5) and locked
with clips (4).
e heat exchangers for versions 24, 28 and 32 dier in their
number of ns (86 ns in version 24) (89 ns in version 28)
(104 ns in version 32), and also for the dierent arrangement
for ow and return (see picture below).
1
34
5
2
6
Flow
Return
1
34
5
2
6
MAIOR EOLO 24
Flow
Return
MAIOR EOLO 28 - 32
1
2