Immergas EOLO Maior kW X User manual

EOLO Maior kW
Instantaneous wall-hung
boilers with sealed-room
EOLO Maior kW
EOLO Maior kW X
EOLO Maior kW X
Wall-hung boilers with sealed-
room for central heating only
or with external storage tank

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EOLO Maior 24-28-32 kW
Wall-hung boiler for heating and instantaneous
production of domestic hot water, with sealed
chamber and forced draught
EOLO Maior 24 kW
EOLO Maior 28 kW
EOLO Maior 32 kW
EOLO Maior kW is a wall-hung boiler room sealed fan assisted
(C type) for heating and production of domestic hot water.
is boiler can be installed also in B22 configuration thanks to
a special (optional) kit.
EOLO Maior kW boilers are approved for outdoor installation
in partially protected places.
N.B.: We mean partially protected place when the appliance is not
directly exposed to weather conditions (rain, snow, hail, etc..).
ere are 3 versions in the range, with powers of 24 kW
(20,640 kcal/h), 28 kW (24,080 kcal/h) and 32 kW (27,520
kcal/h).
e regulation and the control functions are managed by an
electronic control board microprocessor with continuous 2-
sensor flame modulation (d.h.w. and central heating).
anks to which the appliance can be connected to the Amico
Remote Control.
e boiler features a standard antifreeze safety device that
protects it against temperatures as low as -5°C (optional as
low as -15°C).
e hydraulic circuit features a copper water-gas
exchanger as well as a new hydraulic unit in a compound
material.
Besides the pump and 3-way electric diverter valve, that,
depending on needs, lets boiler water circulate in the central
heating system or in a stainless steel plate exchanger for the
instant production of domestic hot water, this unit also
houses the devices that control the hydraulic circuit (system
absolute pressure switch, system adjustable by-pass, etc.).
General features.
Combustion air flow into the sealed chamber and flue
extraction are ensured by a fan; the correct operation of which
is controlled by a differential pressure switch.
e boiler functioning parameters are set by turning the control
panel knobs.
e functioning status and possible anomalies are easily signal-
led by leds on the panel.

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EOLO Maior 28 kW X
Wall-hung boiler sealed chamber and forced
draught for heating only, pre-arranged for the
connection to a separate storage tank
EOLO Maior 28 kW X
EOLO Maior kW X is a wall-hung boiler room sealed fan
assisted (C type) that provides space heating only, pre-arranged
for the connection to a separate storage tank of 80, 105, 120,
e 200 litres, thanks to a special (optional) kit.
is boiler can be installed also in B22 configuration thanks to
a special (optional) kit.
EOLO Maior kW X boilers are approved for outdoor instal-
lation in partially protected places.
N.B.: We mean partially protected place when the appliance is not
directly exposed to weather conditions (rain, snow, hail, etc..).
e boiler is available with a power of 28 kW (24,080 kcal/
h).
e regulation and the control functions are managed by an
electronic control board microprocessor drive.
anks to which the appliance can be connected to the Amico
Remote Control.
e boiler features a standard antifreeze safety device that
protects it against temperatures as low as -5°C (optional as
low as -15°C).
e hydraulic circuit features a copper water-gas exchanger
as well as a new hydraulic unit in a compound material.
Besides the pump, this unit also houses the devices that con-
trol the hydraulic circuit (system absolute pressure switch, system
adjustable by-pass, etc.).
Combustion air flow into the sealed chamber and flue
extraction are ensured by a fan; the correct operation of which
is controlled by a differential pressure switch.
General features.
e boiler functioning parameters are set by turning the control
panel knobs.
e functioning status and possible anomalies are easily signal-
led by leds on the panel.

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EOLO Maior kW main dimensions and connections.
Legend:
G - Gas supply
AC - D.h.w. outlet
AF - D.h.w. (cold) inlet
R - System return
M - System delivery
V - Electrical connection
EOLO Maior kW control panel.
Legend:
1 - Stand by LED
2 - Burner on LED
3 - D.h.w. on LED
4 - Central heating on LED
5 - Temperature LED – Ignition stop malfunction
6 - Temperature LED – Flue pressure switch malfunction
7 - Temperature LED – System pressure insufficient malfunction
8 - Temperature LED – Circulation insufficient malfunction
9 - Temperature LED – Delivery probe faulty
10 - Temperature LED – Domestic hot water probe faulty
11 - Temperature LED – Overheating lock
12 - Stand-by-D.h.w./Remote Control (CAR)-D.h.w. and Heating-Reset-
selector switch
13 - D.h.w. temperature knob
14 - Central heating temperature knob
15 - Boiler manometer
Height (mm) Width (mm) Depth (mm)
830 440 350
CONNECTIONS
GAS DOMESTIC
HOT WATER SYSTEM
G AC AF R M
1/2” 1/2” 1/2” 3/4” 3/4”

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EOLO Maior kW X Main dimensions and connections.
EOLO Maior kW X Control panel.
Legend:
1 - Stand by LED
2 - Burner on LED
3 - D.h.w. on LED
4 - Central heating on LED
5 - Temperature LED – Ignition stop malfunction
6 - Temperature LED – Flue pressure switch malfunction
7 - Temperature LED – System pressure insufficient malfunction
8 - Temperature LED – Circulation insufficient malfunction
9 - Temperature LED – Delivery probe faulty
10 - Temperature LED – Domestic hot water probe faulty (optional)
11 - Temperature LED – Overheating lock
12 - Stand-by-D.h.w./Remote Control (CAR)-D.h.w. and Heating-Reset-
selector switch
13 - D.h.w. temperature knob (optional)
14 - Central heating temperature knob
15 - Boiler manometer
Legend:
G - Gas supply
RR - System filling
R - System return
M - System delivery
V - Electrical connection
Height (mm) Width (mm) Depth (mm)
830 440 350
CONNECTIONS
GAS WATER SYSTEM
G RR R M
1/2” 1/2” 3/4” 3/4”

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EOLO Maior kW main components.
Legend:
1 - Gas valve
2 - D.H.W. NTC probe
3 - D.H.W. flow switch
4 - D.H.W. heat exchanger
5 - Burner
6 - Combustion chamber
7 - Sealed chamber
8 - Fan
9 - Intakes (air A) - (flues F)
10 - Positive signal pressure point
11 - Negative signal pressure point
12 - Flue pressure switch
13 - Delivery NTC probe
14 - Overheating Safety thermostat
15 - Draught diverter
16 - Primary exchanger
17 - System expansion vessel
18 - Ignition and detection electrodes
19 - Automatic air vent
20 - Circulator
21 - System pressure switch
22 - 3-bar safety valve
23 - ree-way valve (motorized)
24 - System draining cock
25 - System filling valve

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EOLO Maior kW X main components.
Legend:
1 - Gas valve
2 - Burner
3 - Combustion chamber
4 - Sealed chamber
5 - Fan
6 - Intakes (air A) - (flues F)
7 - Positive signal pressure point
8 - Negative signal pressure point
9 - Flue pressure switch
10 - Delivery NTC probe
11 - Overheating Safety thermostat
12 - Draught diverter
13 - Primary exchanger
14 - Ignition and detection electrodes
15 - System expansion vessel
16 - Automatic air vent
17 - Circulator
18 - System pressure switch
19 - 3-bar safety valve
20 - ree-way valve plug
21 - System draining cock
22 - System filling valve

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Hot water for central heating and domestic use is produced
by a primary and secondary (d.h.w.) circuit that are engaged
according to requirements.
EOLO Maior kW hydraulic diagram.
Legend:
1 - D.H.W. flow switch
2 - D.H.W. NTC probe
3 - D.H.W. heat exchanger
4 - Gas valve
5 - Burner
6 - Primary exchanger
7 - Draught diverter
8 - Fan
9 - Sealed chamber
10 - Flue pressure switch
11 - Delivery NTC probe
12 - Overheating Safety thermostat
13 - System expansion vessel
14 - Automatic air vent
15 - Circulator
16 - ree-way valve (motorized)
17 - System draining cock
18 - System filling valve
19 - Adjustable by-pass
20 - System pressure switch
21 - 3-bar safety valve
22 - One-way valve
23 - Flow limiter
G - Gas supply
AC - D.h.w. outlet
AF - D.h.w. (cold) inlet
R - System return
M - System delivery

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EOLO Maior kW X hydraulic diagram.
Legend:
1 - Gas valve
2 - Burner
3 - Primary exchanger
4 - Draught diverter
5 - Fan
6 - Sealed chamber
7 - Flue pressure switch
8 - Delivery NTC probe
9 - Overheating Safety thermostat
10 - System expansion vessel
11 - Automatic air vent
12 - Circulator
13 - System draining cock
14 - ree-way valve (without motor)
15 - Adjustable by-pass
16 - System pressure switch
17 - 3-bar safety valve
18 - System filling valve
G - Gas supply
RR - System filling
R - System return
M - System delivery
e primary circuit with relevant control and safety devices
is triggered each time there is a request for central heating or
antifreeze.

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Primary circuit (boiler circuit).
e primary circuit with relevant control and safety devices
is triggered each time there is a request for central heating
or domestic hot water.
Operation (see EOLO Maior kW).
e heat contained in the flue produced by combustion is ab-
sorbed by the copper blades of the primary water-gas exchanger
(6) which, in turn, transfers it to the water circulating inside
it by means of the boiler pump (15).
e water is transferred directly into the system or else can
be diverted inside the stainless steel instantaneous plate ex-
changer (3).
is depends on the position of the motorised 3-way valve
Head (kPa)
Flow rate Litres/h
A
A = Head available to the system on maximum speed with the by-pass off (adjustment screw fully tightened)
B = Head available to the system on maximum speed (screw tightened 1.5 turns compared to the adjustment screw completely loose)
C = Head available to the system on maximum speed with the by-pass open (adjustment screw completely loose)
Head (m H2O)
EOLO Maior 24 kW
Head (kPa)
Flow rate Litres/h
Head (m H2O)
EOLO Maior 28 kW - 28 kW X
B
C
A
B
C
(16) which, when idle, lets the water flow through the d.h.w.
exchanger (3); on the other hand, when responding to a heat-
ing request, the flow is diverted to the system delivery (M)
and return (R) pipes.
Flow-head graph.
e trend of the curve that represents the system’s flow-head
ratio depends on how fast the pump is working and on how
the system by-pass is adjusted. Depending on the position,
it provides the system with a higher or a smaller head. e
characteristic curves are shown in the following graphs.

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Boiler circulator (1).
It works on the primary circuit return, located immediately
after the 3-way diverter valve to which it is connected.
It is part of the integrated multi-function unit made in a
compound material.
A space on the body houses the automatic air vent (2).
Primary exchanger (1).
It is a water-gas lamellar exchanger with copper pipes and
fins (N° 75 fins 24 kW version) (N° 98 fins 28 and 32 kW
version). e central heating delivery NTC probe (2) and the
overheating safety thermostat (3) are located on the exchanger’s
outlet (delivery).
e four pipes it is made of are connected in series (4).
It is connected to the pump delivery and primary circuit deli-
very by means of pipes with threaded fittings.
1
34
2
Delivery
Return
A = Head available to the system on maximum speed with the by-pass off (adjustment screw fully tightened)
B = Head available to the system on maximum speed (screw tightened 1.5 turns compared to the adjustment screw completely loose)
C = Head available to the system on maximum speed with the by-pass open (adjustment screw completely loose)
EOLO Maior 32 kW
Head (m H2O)
Head (kPa)
Flow rate Litres/h
A
B
C

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1
34
Circulator
delivery
System
return
CIRCULATOR
RETURN
SYSTEM
RETURN
D.H.W.
EXCHANGER
RETURN
Motorised 3-way diverter valve for combi mod-
els.
Whenever a request is made (for domestic hot water or central
heating) thanks to this 3-way electric diverter valve, working on
the primary circuit return, boiler water is transferred either to
the heating system or to the d.h.w. exchanger (plate type).
is depends on the position of the shutter (5) which shuts
off passage to the system and simultaneously opens the way
to the d.h.w. exchanger (domestic hot water position) or, vice
versa (central heating position).
is shutter (5) is moved in either position by powering the
motor (1).
e hydraulic part of the boiler consists of a unit made in a
composite material (2) that also includes the circulator and it is
operated by a motor (1) which causes it to move as required.
Operation.
When the central heating or domestic hot water position has
to be reached the motor (1) is switched on by the integrated
board.
Each time the motor turns of 180° it causes the shutter (5) to
move and it compresses (central heating position) or releases the
shutter’s contrast spring (4) (domestic hot water position).
Both the spring (4) and shutter (5) are inside the 3-way car-
tridge (3).
When the position requested is reached hydraulically, one of
two limit switches (6) located inside the motor box (1) opens
and closes alternately.
When idle, the shutter (5) is positioned in d.h.w. functio-
ning.
Each time an heating request is satisfied the motor (1) turns
and releases the shutter's contrast spring (4).
On the contrary, at the end of each d.h.w. request, the shutter
(5) remains in the position reached.

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Safety devices and controls for combi versions.
Adjustable system by-pass (2).
is device guarantees the circulation of water in the primary
circuit (between delivery and return) even when it would be
prevented by the high resistance of the system.
It is mounted on the delivery manifold (1) and adjusted by a
screw that can be accessed from the bottom of the valve sup-
porting plate.
System filling unit (3).
is is a ball cock located between the boiler circuit and the
domestic cold water inlet and it makes possible to pressurise
the central heating system.
e cock is connected to a filling up fitting (4) which, in turn,
is connected to the motorised 3-way diverter valve unit.
System pressure switch (5).
is switch detects the pressure inside the primary circuit. It
is housed in the delivery manifold unit (1) and coupled to a
microswitch that prevents the burner working when the pres-
sure measured is below 0.3 bar.
It prevents the primary exchanger overheating.
Automatic air vent (6).
It automatically expels any gaseous substances from the boiler
circuit.
It is mounted on the circulator delivery, directly on the hy-
draulic unit.
Safety valve 3 bar (7).
It prevents the safety pressure being exceeded in the primary
circuit (3 bar).
It is located at the front of the delivery manifold unit (1) and
fixed on the outside by a fork.
When this valve trips it causes water to come out through the
delivery pipe.
System expansion vessel (8).
It compensates the changes in volume following the heating
of water and permits to reduce pressure changes.
It has an 10-litre capacity (7.4 useful litres) and a 1.0 bar
preload pressure.
It is located at the back of the appliance.
System
delivery
2
1
4
6
3
7
5
1
8

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43
1
5
2
6
CIRCULATOR
RETURN
SYSTEM
RETURN
CAP
Motorized 3-way valve for "X" models heating
only (optional).
is electrical three-way valve operates on the primary circuit
return and it allows, according to the specific request (d.h.w.
or heating), the water circulation in the heating circuit or in
the cylinder coils (Separate storage tank of 80, 105, 120 e 200
litres).
is depends on the position of the shutter (5) wich shuts
off passage to the system and simultaneously opens the way
to the cylinder coils (domestic hot water position), or viceversa
(central heating position).
e shutter (5) switching in both the positions is realized by
supplying the (optional) electric motor (1).
e hydraulic part of the boiler consist of a unit made in a
composite material (2) that also includes the circulating pump
and it is operated by a motor (1) (optional) that causes it to
move as required.
Before fitting the motor it is necessary to remove the cap (6)
locked with the respective fork.
Heating only functioning.
e cap (6) pushes the shutter (5) and compresses the shutter’s
contrast spring (4) (heating position), in this way the hydraulic
group is always positioned in heating functioning mode.
Both the spring (4) and shutter (5) are inside the 3-way car-
tridge (3).
Heating and domestic hot water functioning (using the
optional motorized 3-way valve).
e functioning is the same that for combi models (see previous
pages).
Circulator
delivery
System
return

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Safety devices and controls for "X" models
heating only.
Adjustable system by-pass (2).
is device guarantees the circulation of water in the primary
circuit (between delivery and return) even when it would be
prevented by the high resistance of the system.
It is mounted on the delivery manifold (1) and adjusted by a
screw that can be accessed from the bottom of the valve sup-
porting plate.
System filling unit (3).
is is a ball cock located between the boiler circuit and the
domestic cold water inlet and it makes possible to pressurise
the central heating system.
e cock is connected to a filling up fitting (4) which, in turn,
is connected to the motorised 3-way diverter valve unit.
System pressure switch (5).
is switch detects the pressure inside the primary circuit. It
is housed in the delivery manifold unit (1) and coupled to a
microswitch that prevents the burner working when the pres-
sure measured is below 0.3 bar.
It prevents the primary exchanger overheating.
Automatic air vent (6).
It automatically expels any gaseous substances from the boiler
circuit.
It is mounted on the circulator delivery, directly on the hy-
draulic unit.
Safety valve 3 bar (7).
It prevents the safety pressure being exceeded in the primary
circuit (3 bar).
It is located at the front of the delivery manifold unit (1) and
fixed on the outside by a fork.
When this valve trips it causes water to come out through the
delivery pipe.
System expansion vessel (8).
It compensates the changes in volume following the heating
of water and permits to reduce pressure changes.
It has an 10-litre capacity (7.4 useful litres) and a 1.0 bar
preload pressure.
It is located at the back of the appliance.
2
1
7
5
1
8
3
6
4
System
delivery

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Secondary circuit (domestic hot water circuit) for combi versions only.
Operation.
Running the domestic hot water causes cold water to flow
through the d.h.w. flow switch (1) and, as a result, the electrical
contact connected to it closes (see the electrical circuit).
After this, the integrated board starts the domestic hot water
priority function phase whereby the burner is ignited and, if
there is an on-going central heating request, the 3-way diverter
valve (2) switches and moves into the working position (see
operation of the 3-way hydraulic diverter valve).
is causes the return pipe (R) to close and the simultaneous
opening of the passage to the d.h.w. exchanger (3).
is prevents circulation in the central heating system while
it is allowed in the plate exchanger inside which the domestic
cold water absorbs the heat contained in the primary circuit
water (see d.h.w. exchanger).
is means that the central heating function is off in this phase,
the production of domestic hot water having priority.
e water-water heat exchange takes place inside the d.h.w.
exchanger (3) which is fixed with screws to the d.h.w. outlet
body (1) and to the d.h.w. inlet body (2).
e part at the top of the left body allows the delivery water to
enter the primary circuit while the part at the bottom allows
the domestic hot water to exit.
Likewise, the top of the right body allows the domestic cold
water to enter while at the bottom, return of the primary
circuit.
e d.h.w. probe (4), by means of which the integrated board
is able to measure the temperature of the domestic hot water,
is mounted on the domestic hot water outlet body (1).
Primary circuit
delivery
Primary circuit
return
4
1
3
2
Primary circuit
delivery
Primary circuit
return
Domestic hot water
outlet
Domestic cold water
inlet

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1
2
1
1
Primary
circuit
delivery
Primary
circuit
return
D.h.w. flow switch (1).
When domestic hot water is drawn at a rate of 2 litres/min or
less and dynamic pressure is 0.3 bar, the d.h.w. flow meter (1)
enables the boiler to work in the d.h.w. mode.
is takes place by means of a magnet that, upon lifting when
it is hit by the flow of domestic cold water, moves closer to
an electrical contact (reed relay) causing it to move due to the
magnetic effect.
When the contact closes, located outside the pipe through
which the water flows, it enables the integrated board to start
the domestic hot water priority functioning phase.
It is fixed with a pin to the valve supporting plate.
A flow limiting device (2) is mounted on the outlet of the
d.h.w. flow switch, 7.55 l/min (2 bar) for model 24 kW, 9.0
l/min (2 bar) for model 28 kW and a 11.28 l/min (2 bar) for
model 32 kW.
D.h.w. exchanger.
is is a water-water exchanger consisting of stainless steel
plates placed on top of each other (16 in the 24 kW version,
20 in the 28 kW version, and 22 in the 32 kW version) on the
surface of which flows, in counter current, the water of the
boiler circuit and the domestic cold water and through which
heat exchange occurs between the two liquids.
For the hydraulic coupling four O rings (1) are used that al-
low direct coupling to the d.h.w. inlet body and to the d.h.w.
outlet body.
D.h.w.
outlet D.c.w.
inlet
Domestic cold water
inlet

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is circuit consists of an atmospheric burner and a modulat-
ing gas valve that permit, respectively, the combustion of gas
and the regulation of its flow rate.
Operation.
When the main coils (3) are powered it causes both shutters
inside the valve to open which lets gas through to the burner.
Consequently the flow rate/pressure in output is adjusted by
acting on the gas valve stabiliser by means of the modulation
coil (1). e gas is injected into the horizontal Venturi pipes
(shafts) through the burner nozzles (7). e air-gas mixture is
created inside these pipes and set alight by the discharge of the
ignition electrodes (5).
Modulating gas valve.
e gas valve (SIT 845) features two main coils (3) and a
modulation coil (1) controlled by the integrated board.
e maximum and minimum outlet pressure settings can be
made on this valve (see gas regulations).
Main electrical coils (3).
ey are two ON-OFF type coils energised (230 Vac) by the
integrated board when the burner has to be ignited.
ey are electrically connected in parallel and energised by
mains power through a special connector (2).
Modulation coil (1).
is low-voltage coil is controlled by the integrated board.
It controls the gas valve stabiliser and is used to change the
outlet pressure in a way proportionate to the dc current that
runs through it.
Gas circuit.
Burner.
e burner consists of horizontal Venturi pipes (6) inside which
gas is injected by the same number of nozzles (7) mounted on
the respective manifold (8).
e diameter of the nozzles (7) varies according to the type of
gas utilised (see technical data).
e number of the nozzles is 11 (24 kW version), 14 (28 kW
version) and 15 (32 kW version).
Ignition occurs thanks to an integrated electronic board that
controls both the ignition (5) and detection (4) electrodes.
Ignition electrodes (5).
ey are controlled by the integrated board that produces an
electric discharge between the electrodes.
ey are positioned on the front of the burner.
Detection electrode (4).
It is controlled by the integrated board and detects burner
ignition.
It is positioned on the front of the burner beside the ignition
electrodes.
1
3
2
4
5
6
8
7

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Gas adjustments.
e maximum and the minimum gas pressure adjustments
can be made on the gas valve respecting the values shown in
the heat outputs table, in function of the model and the gas
type (see technical data).
Measurements are made using a differential manometer
connecting it's positive pressure point to the gas valve outlet
(4) and it's negative pressure point to the positive pressure
point in the flange with traps located at the top of the sealed
chamber (see figure).
Legend:
1 - Modulation coil
2 - Minimum output adjustment
3 - Maximum output adjustment nut
4 - Gas valve outlet pressure point
5 - Gas valve inlet pressure point
6 - Protection cap
Valve SIT 845
SIT 845 gas valve
Adjustment maximum pressure.
Run off some domestic hot water after having set its tempera-
ture selector on maximum.
Turn the brass nut (3) clockwise to increase pressure to the
burner and counter clockwise to reduce it.
Adjustment minimum pressure
(to be done after the adjustment maximum pressure).
After having cut electrical power to the modulation coil, turn
the screw (2) clockwise to increase pressure to the burner and
anticlockwise to reduce it.
Gas conversion.
ere are special kits to adapt the boiler to a gas type different
to the one for which the boiler is set as standard (natural gas
or LPG).
Conversion consists in changing the burner nozzles and moving
the gas type selector “NATURAL GAS – LPG” (S8) on the
integrated board.
Maximum and minimum pressures are then regulated on the
gas valve as described above.
e maximum and minimum output setting in the central
heating phase can be set via the parameters (see integrated
board operation).
e burner ignition pressure is not regulated because the
type of board operation does not require such a setting (see
integrated board operation).