Immergas EOLO Extra 24 kW User manual

EOLO Extra kW
Instant wall-hung boilers
airtight chamber
for outdoors
EOLO Extra kW

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EOLO Extra kW
Wall-hung room sealed fan assisted boiler for
outdoors.
EOLO Extra 24 kW
EOLO Extra 28 kW
EOLO Extra 32 kW
EOLO Extra kW is a wall-hung room-sealed fan-assisted
boiler (type C) for central heating and producing domestic
hot water.
e boilers of the EOLO Extra kW series are type-approved
for installing outside the building in the open, using a top
cover kit (optional).
e boiler is available with an output power of 24 kW (20,640
kcal/h), 28 kW (24,080 kcal/h) and 32 kW (27,520 kcal/h).
One of the standard features on the boiler is an antifreeze
system that protects against temperatures as low as -15°C (but
the connecting pipes have to be lagged).
e boiler is easily controlled remotely controlled by a
Remote Control (see the CAR technical data sheet) which works
together with a microprocessor controlled p.c.b. with continuo-
us 2-sensor flame modulation (d.h.w. and central heating).
e knobs on the control panel are for setting boiler ope-
rating parameters. is panel visually displays status and the
functioning mode with the LEDs on it. Malfunctions can also
be seen on the Remote Control display.
e hydraulic circuit is equipped with a water-gas exchan-
ger in copper that uses a new 3-way electric valve group
and a new pump group made in a composite material on
which the circulator and the devices to control the hydraulic
circuit are housed (the system’s absolute pressure switch, a 3-bar
safety valve, an automatic system by-pass, etc.).
General features.
e supply of combustion air to inside the sealed chamber and
the expulsion of fumes are ensured by a fan whose correct ope-
ration is controlled by a differential fumes pressure switch.

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EOLO Extra 24 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
Height (mm) Width (mm) Depth (mm)
775 440 240
CONNECTIONS
GAS DOMESTIC
WATER SYSTEM
G AC AF R M
1/2” 1/2” 1/2” 3/4” 3/4”
EOLO Extra 28-32 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
Height (mm) Width (mm) Depth (mm)
775 520 250
CONNECTIONS
GAS DOMESTIC
WATER SYSTEM
G AC AF R M
1/2” 1/2” 1/2” 3/4” 3/4”

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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 / On / Programming / Reset main switch
13 - Parameters selection knob
14 - Parameters modification knob
15 - Boiler manometer
EOLO Extra kW Control panel.

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EOLO Extra 24 kW main components.
Legend:
1 - Boiler pressure gauge
2 - Domestic water probe
3 - D.h.w. flow switch
4 - Gas valve
5 - System pressure switch
6 - Burner
7 - Combustion chamber
8 - Airtight chamber
9 - Fan
10 - Testing hole (air A) - (fumes F)
11 - Pressure point with positive signal
12 - Pressure point with negative signal
13 - Flue pressure switch
14 - Delivery probe
15 - Safety thermostat
16 - Draught diverter
17 - Primary exchanger
18 - Ignition and detection electrodes
19 - System expansion vessel
20 - Automatic air vent
21 - Boiler circulator
22 - D.h.w. exchanger
23 - 3-bar valve (motorised)
24 - Automatic by-pass
25 - 3-way safety valve
26 - System draining cock
27 - Domestic water draining fitting
28 - System filling valve

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EOLO Extra 28-32 kW main components.
Legenda:
1 - Domestic water draining fitting
2 - Domestic water probe
3 - D.h.w. flow switch
4 - Gas valve
5 - System pressure switch
6 - Burner
7 - Combustion chamber
8 - Airtight chamber
9 - Fan
10 - Testing hole (air A) - (fumes F)
11 - Pressure point with positive signal
12 - Pressure point with negative signal
13 - Flue pressure switch
14 - Delivery probe
15 - Safety thermostat
16 - Draught diverter
17 - Primary exchanger
18 - Ignition and detection electrodes
19 - System expansion vessel
20 - Automatic air vent
21 - Boiler circulator
22 - D.h.w. exchanger
23 - 3-way valve (motorised)
24 - Automatic by-pass
25 - 3-bar safety valve
26 - System draining cock
27 - Boiler pressure gauge
28 - System filling valve

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EOLO Extra kW hydraulic diagram.
Legend:
1 - D.h.w. flow switch
2 - Flow limiter
3 - System filling valve
4 - Domestic water probe
5 - Gas valve
6 - Burner
7 - Primary exchanger
8 - Draught diverter
9 - Fan
10 - Airtight chamber
11 - Flue pressure switch
12 - Delivery probe
13 - Safety thermostat
14 - System expansion vessel
15 - Automatic air vent
16 - Boiler circulator
17 - System pressure switch
18 - D.h.w. exchanger
19 - 3-way valve
20 - Automatic by-pass
21 - System draining cock
22 - 3-bar safety valve
G - Gas supply
AC - D.h.w. outlet
AF - D.h.w. (cold) inlet
R - System return
M - System delivery
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.

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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.
e heat contained in the flue produced by combustion is ab-
sorbed by the copper blades of the primary water-gas exchanger
(7) which, in turn, transfers it to the water circulating inside
it by means of the boiler pump (16).
e water is transferred directly into the system or else can
be diverted inside the stainless steel instantaneous plate ex-
changer (18).
is depends on the position of the motorised 3-way valve
(19) which, when idle, lets the water flow through the d.h.w.
exchanger (18); 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 cha-
racteristic curves are shown in the following graphs.
D
Flow-rate l/h
A
Head (m H2O)
EOLO Extra 24 kW
Head (kPa)
Flow-rate l/h
Head (m H2O)
EOLO Extra 28 kW
B
C
A
B
C
D
Head (kPa)
A = Head available to the system on maximum speed with the by-pass off.
B = Head available to the system on maximum speed with the by-pass on.
C = Head available to the system at second speed with the by-pass off.
D = Head available to the system at second speed with the by-pass on.

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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
1
2
EOLO Extra 32 kW
Flow-rate l/h
A
B
C
D
A = Head available to the system on maximum speed with the by-pass off.
B = Head available to the system on maximum speed with the by-pass on.
C = Head available to the system at second speed with the by-pass off.
D = Head available to the system at second speed with the by-pass on.
Head (m H2O)
Head (kPa)

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Exchanger
return
D.H.W.
EXCHANGER
DELIVERY
Motorised 3-way valve.
It is an electric motor (1) connected to the 3-way unit (2) and
locked by a fork that allows, according to the request made
(d.h.w. or central heating), boiler water to flow into the central
heating system or in the d.h.w. plate exchanger.
is depends on the position of the shutter (4) which closes
passage to the system while simultaneously opening it to the
d.h.w. exchanger (d.h.w. position) or vice versa (central heating
position).
e motor (1) is made to work by the electronic board and,
with each 180° rotation, the shutter (4) moves into both
positions.
e hydraulic part consists of a brass unit (2).
Operation in the central heating mode.
e shutter’s (4) counteracting spring (3) is not compressed
(central heating position), keeping passage to the d.h.w. plate
exchanger closed and passage to the system delivery open.
Both the spring (3) and shutter (4) are located inside the 3-
way brass body (2).
Operation in the d.h.w. mode.
e standard position of the hydraulic unit is always in the
d.h.w. mode.
e electric motor (1) pushes the rod (5) to which the shutter
(4) is connected which closes passage to the system, simulta-
neously opening it to the d.h.w. plate exchanger, the shutter’s
(4) contrasting spring (3) is compressed (d.h.w. position).
Both the spring (3) and shutter (4) are located inside the 3-way
valve brass body (2).
EXCHANGER
DELIVERY
SYSTEM
DELIVERY
1
2
3
4
5
Exchanger
delivery
System
delivery
D.h.w.
exchanger
delivery

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Safety devices and controls.
Automatic system by-pass (4).
is device guarantees circulation of water in the primary cir-
cuit (between delivery and return) even when this is prevented
by the system’s high resistance.
It is installed between the circulator body and the 3-way
unit.
It can be turned on or off by means of the screw (4) accessible
from the front; with the screwdriver slot horizontal the by-pass
is ON (open), with the screwdriver slot vertical the by-pass is
OFF (closed).
System filling device (7).
is device is a ball cock located between the boiler circuit
and d.h.w. cold water inlet and permits pressurisation of the
central heating system.
is unit is connected to the d.h.w. flow switch (6) by means
of a threaded fitting and to the pump unit (2) by means of
an O ring.
System pressure switch (5).
It reads the pressure inside the primary circuit.
It is housed on the circulator body (2) and coupled to a mi-
croswitch that prevents the burner working when the pressure
measured is below 0.3 bar.
It prevents the primary exchanger from overheating.
Automatic air vent (1).
It automatically expels any gaseous substances from the boiler
circuit.
It is mounted on the circulator’s delivery side, directly on its
body (2).
3-bar safety valve (3).
is valve prevents the safety pressure being exceeded in the
primary circuit (3 bar).
It is fitted on the front of the circulator body (2) and fixed on
the outside with a fork.
When this valve triggers water exits from the boiler return
pipe.
System expansion vessel (8).
It compensates for variations in volume as a result of the water
heating which also limits pressure variations.
It has an 8-litre capacity (5.1 useful litres) and a 1.0 bar preload
pressure.
It is located on the right of the boiler alongside the sealed
chamber and is connected to the cold water inlet manifold
by a copper pipe.
8
6
7
2
5
34
1
2

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4
1
3
2
5
4
Operation.
When domestic hot water is drawn cold water flows inside
the d.h.w. flow switch (1) which closes the electrical contact
coupled to it (see the electrical circuit).
As a result, the integrated board starts the d.h.w. priority phase
that ignites the burner and, if there’s an ongoing central heating
request, switches the 3-way diverter valve (2) moving it into the
working position (see operation of the hydraulic 3-way valve).
is causes the delivery pipe (M) to close and simultaneously
the passage opens to the d.h.w. exchanger (3).
In this way circulation in the central heating system is preven-
ted while it is allowed in the plate exchanger, inside which the
domestic cold water absorbs the heat from the primary circuit
water (see d.h.w. exchanger).
So in this phase, central heating is off, domestic hot water
having priority.
e water/water heat exchange occurs inside the d.h.w. exchan-
ger (3) which is secured to the d.h.w. inlet (1) and outlet (2)
body with screws.
e top of the body on the left allows cold domestic water to
enter, while at the bottom it allows primary circuit return.
In the same way, the top part of the body on the right allows
the outlet of domestic hot water while at the bottom it allows
primary circuit delivery.
Secondary circuit (D.h.w. Circuit).
Cold water
inlet
Primary circuit
delivery
Primary
circuit return
D.h.w. outlet
D.h.w. outlet

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1
1
Primary
circuit
delivery
Primary
circuit
return
D.h.w. flow switch (2).
Whenever domestic hot water is drawn at a rate of at least 1.5
l/min and a dynamic pressure of 0.3 bar, the flow switch (2)
enables the boiler to work in the d.h.w. mode.
is is done by means of a magnet that, lifting when hit by the
flow of domestic cold water, moves near to an electrical contact
(reed relay) causing it to move thanks to the magnetic effect.
When the contact closes, which is located outside the pipe
through which the water flows, it enables the adjustment board
to start the domestic hot water priority phase.
It consists of two parts (one in brass and one in plastic) that are
coupled together and locked with a pin.
A G1/4” thread on its body connects it to the filling unit
(3).
An 7.0 l/min (2 bar) for model 24, 9.0 l/min (2 bar) for model
28 and a 11.5 l/min (2 bar) for model 32 is installed at the
flow switch exit.
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
Cold
water
inlet
1
2
3
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 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.
4
5
6
8
7
1
3
2

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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).

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Flue circuit.
Operation.
e products of combustion, after having hit the water-gas
exchanger (2), are slowed down and distributed by the plate
(12) thus increasing combustion efficiency. ey are then
conveyed to a draught diverter (4) on top of which the flue
extractor (fan) (5) is mounted.
Fan operation ensures forced expulsion of the flue and, at the
same time creates a vacuum in the sealed chamber (3) so the
combustion air can be extracted from outside.
Correct fume extraction is controlled by a differential flue pres-
sure switch (6) that enables or prevents burner ignition.
Air-flue intake traps (7-8).
e top outer part of the sealed chamber features two intake
traps with screw closing, accessible from the front and from
where combustion air (7) and flue (8) can be sampled.
Flue pressure switch signal pressure points (9-10).
e top outer part of the sealed chamber features two pressure
points with screw closing by means of which it is possible to
measure the signal on the ends of the flue pressure switch
(6).
e negative pressure point (9) is connected to a “Y” shaped
pipe (11) which, in turn, is connected to the negative pressure
point of the flue pressure switch (6) and to the pressure point
positioned on the fan.
e positive pressure point (10) is connected directly to the
inside of the sealed chamber.
Flue pressure switch (6).
It is located at the top inside the sealed chamber and detects, by
means of the relative points, the difference in pressure between
the fan outlet (negative signal) and the inside of the sealed
chamber (positive signal).
e signal measured by the pressure switch is variable accord-
ing to the length of the air inlet/exhaust terminals and can be
measured by the relative pressure points located at the top of
the sealed chamber (9-10).
9
10
8
7
5
12
2
6
11
4

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When it triggers it causes a switch to close (S6) that acts on the
integrated board enabling or preventing burner ignition.
Flue pressure switch
triggering pressures
ON
Pa (mm H2O)
ON
Pa (mm H2O)
EOLO Extra 24 kW 52 (5.3) 42 (4.3)
EOLO Extra 28 kW 44 (4.5) 36 (3.7)
EOLO Extra 32 kW 52 (5.3) 42 (4.3)
Fan (5).
e extractor operates downstream from the combustion
chamber and is fixed vertically to the top of the draught diverter
(4) from where it extracts the flue and conveys them to the
exhaust pipes to which the boiler is connected. It simultaneou-
sly guarantees the flow of air inside the sealed chamber.
It is controlled by the integrated board and its operation coin-
cides essentially with that of the burner.

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Intake and outlet systems.
(see the intake and outlet terminal instructions).
e EOLO Extra kW boiler is designed for connecting the
couple-on air intake/outlet pipes and can be installed indoors
or outdoors in the open or in a partly sheltered location in the
following configurations:
Outdoors (in the open):
- room-sealed fan-assisted with direct air intake (type C)
utilising a cover kit;
Outdoors (in a partly sheltered location):
- room-sealed fan-assisted (type C) using the vertical or ho-
rizontal concentric kits, keeping the side plates on and not
having to use the top cover kit.
Indoors:
- fan-assisted with open chamber (type B) using the cover
kit;
- room-sealed fan-assisted (type C).
As far as concerns the head losses of each accessory, the various
combinations that can be created and the position of the
flue shutter which depends on the length of the pipes, see
the instructions for the air intake/outlet terminals (boiler
instruction manual).
e coupling of the accessories (curves, extensions, terminals)
is the push-fitting type and sealing is ensured by silicon lip
seals.
Room sealed fan assisted configuration with di-
rect air intake (type C) for outdoor installation
in the open (see figure on right).
By using the cover (1), positioned on top of the sealed chamber,
the boiler can be installed outdoors in the open.
Intake.
e two plates (3) – closing the holes at the top of the sealed
chamber – have to be removed in order to mount the cover
(1).
Combustion air is taken directly from the environment,
exploiting the gap between the bottom of the cover (1) and
the top of the boiler.
Note: in the 28 kW version it is compulsory to cover the left
intake hole with the plate (3).
Outlet.
A flange (2) is used for coupling the 80 mm diameter outlet pi-
pes, used in the split systems. You can have either a horizontal
(A) or vertical (B) outlet depending on the accessories used.
To avoid condensate problems, the outlet pipe should be li-
mited to 5 straight metres for normal pipes and 12 straight
metres for insulated pipes.
Maximum permitted length is 12 straight metres.
To ensure the boiler works properly with this kit, the flue
shutter needs to be adjusted on reference “5” (see boiler in-
struction manual).
1
B
A
2
3
Fan-assisted with open chamber (type B) con-
figuration for indoor installation (see figure
above).
e cover kit described previously is used. By removing the
side plates from the sealed chamber, air is taken in directly
from the room where the boiler is installed.
Fumes are discharged through 80 diameter pipes in a single
flue or directly outside.
Room-sealed fan-assisted (type C) configura-
tion.
(See EOLO Maior kW)
Outlet.
(See EOLO Maior kW)
Intake.
(See EOLO Maior kW)
Intake and Outlet kit.
(See EOLO Maior kW)

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Electrical circuit.
EOLO Extra kW electrical circuit is controlled 100% by a mi-
croprocessor controlled p.c.b. that controls all boiler functions
together with the CAR control panel.
Some of the control and safety devices operate at mains voltage
(230 Vac) while others at low voltage.
Legend:
A5 - CAR interface board
B1 - Delivery probe
B2 - D.h.w. probe
B4 - External probe (optional)
CAR - Remote control
CZ - Zone control unit (optional)
E1 - Ignition electrodes
E2 - Detection electrode
E4 - Safety thermostat
F1 - Line fuse
F2 - Neutral fuse
M1 - Boiler circulator
M20 - Fan
M30 - 3-way valve
R5 - D.h.w. temperature trimmer
R6 - Central heating trimmer
R10 - Main selector switch
S4 - D.h.w. flow switch
S5 - System pressure switch
S6 - Flue pressure switch
S8 - Gas type selector switch
T1 - Ignition transformer
Y1 - Gas valve
Y2 - Gas valve modulator
230 V AC circuit.
Safety devices and controls.
is detects ignition of the burner by whose flame it is covered.
It is connected to the integrated board.
Detection electrode
(E2)
ey interrupt power to the circuit when power input is over
3.15 A.
ey are fitted on the integrated board.
Line fuse (F1)
Neutral fuse (F2)
Fuse
3,15 AF 250 V

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