Immergas MAIOR EOLO 4 E Series Leitfaden

MAIOR EOLO 4 E

Instantaneous wall-hung

boilers, sealed-room

with "Aqua Celeris" system

MAIOR EOLO 4 E

STMaE4E and 07/11 MAIOR EOLO 4 E

Technical Documentation Technical Documentation

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.

STMaE4E and 07/11 MAIOR EOLO 4 E

Technical DocumentationTechnical Documentation

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)

STMaE4E and 07/11 MAIOR EOLO 4 E

Technical Documentation Technical Documentation

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

STMaE4E and 07/11 MAIOR EOLO 4 E

Technical DocumentationTechnical Documentation

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)

STMaE4E and 07/11 MAIOR EOLO 4 E

Technical Documentation Technical Documentation

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

STMaE4E and 07/11 MAIOR EOLO 4 E

Technical DocumentationTechnical Documentation

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.

STMaE4E and 07/11 MAIOR EOLO 4 E

Technical Documentation Technical Documentation

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

STMaE4E and 07/11 MAIOR EOLO 4 E

Technical DocumentationTechnical Documentation

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).

Flow

Return

MAIOR EOLO 24

Flow

Return

MAIOR EOLO 28 - 32

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