Immergas EOLO Superior PLUS 24 Leitfaden

Technical documentation Technical documentation

STESP ed 02/02 11

EOLO SUPERIOR PLUS

EOLO Superior PLUS

Wall-hung boiler with sealed

combustion chamber and fan-

assisted with external storage tank

EOLO 24 Superior PLUS

- GENERAL FEATURES

The EOLO Superior Plus is a wall boiler designed to be used together with PLUS storage

tanks ( 80 l, 105 l and 120 l).

Adjustment and control of the two units are entrusted to a microprocessor-controlled

electronic board which, thanks to a display, shows operating conditions (settings,

temperatures, safety devices, etc.).

The boiler has an efficiency over 90% and features a standard anti-frost device which

protects it down to temperatures of -5°C.

The hydraulic circuit features a high-head copper water-gas exchanger, an electric 3-way

valve and an adjustable system by-pass.

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.

The appliance is prearranged for the connection to a remote control panel (see Remote

Friend Control technical sheet), to the area control unit (see area control unit technical

sheet) and to the Multisystem Water Disconnector (see D.I.M. technical sheet).

The AISI 316 L STAINLESS STEEL storage tanks feature a standard anode and expansion

vessel and can be connected to the re-circulation system by means of a special kit (optional).

Technical documentation Technical documentation

STESP ed 02/02

EOLO SUPERIOR PLUS

MAIN DIMENSIONS AND CONNECTIONS

BOILER

DIMENSIONS (mm)

HEIGHT WIDTH DEPTH

850 450 350

CONNECTIONS

GAS SYSTEM

GRB-MB RI-MI

1/2 “ 3/4 “ 3/4 “

V - power connection

G - gas supply

RB - boiler return

MB - boiler flow

A - system filling

RI - system return

MI - system flow

STORAGE TANK UNIT

DIMENSIONS (mm)

80 l 105 l 120 l

HEIGHT 850 1020 850

WIDTH 500 500 600

DEPTH 500 500 600

CONNECTIONS

SYSTEM DOMESTIC HOT WATER

RB-MB EURC

3/4 “ 1/2 “ 1/2 “ 1/2 “

V - power supply

U - d.h.w. outlet

RB - boiler return

MB - boiler flow

E - d.h.w. inlet

RC - recirculation (optional)

Technical documentation Technical documentation

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EOLO SUPERIOR PLUS

EOLO Superior PLUS MAIN COMPONENTS

1 - Intake points (A=air) (F=fumes)

2 - Flue safety pressure switch

3 - Fan

4– System drain valve

5 - Gearmotor for 3-way valve

6 - Gas valve

7 - System filling valve

8 - Automatic air vent

9 - Sealed chamber

10 - Expansion vessel

11 - Adjustment and limit NTC probe

12 - Combustion chamber

13 - Overheat. safety thermostat

14 - Circulator

15- 3-bar safety valve

13- Pump pressure switch

17- 3-way valve

18- Adjustable automatic by-pass

19- Positive signal pressure point

20- Negative signal pressure point

21 - Draught diverter

22 - Primary exchanger

23 - Ignition and detection electrodes

24 - Burner

CONTROL PANEL

1 - Green heating operating indicator

2 - Heating temperature selector

3 - D.h.w. temperature selector

4 - Green d.h.w. operation indicator

5 - 0/SUMMER and CAR/WINTER switch

6 - Boiler pressure gauge

7 - Reset

8 - Temp./diagnostics display

9 - Burner operation indicator

Technical documentation Technical documentation

STESP ed 02/02 4

EOLO SUPERIOR PLUS

PLUS STORAGE TANK MAIN COMPONENTS

Storage tank 80 l Storage tank 105 l

Storage tank 120 l

1 - D.h.w. NTC sensor

2 - D.h.w. drain valve

3 - Thermometer

4 - D.h.w. expansion vessel

5 - Coil

6 - Anode

CONTROL PANEL

1 - Storage-tank ON-OFF

thermostat setting cap

2 - Storage tank thermometer

Technical documentation Technical documentation

STESP ed 02/02

EOLO SUPERIOR PLUS

HYDRAULIC CIRCUIT

1 - Gas valve

2 - 3-way valve gearmotor

3 – Electric 3-way valve

4 - Burner

5 - Primary exchanger

6 - Sealed chamber

7 - Draught diverter

8 - Fan fan

9 - Flue safety pressure switch

10- NTC limit and adjust. sensor

11- Air vent valve

12- Expansion vessel

13- Circulator

14- Overheat. safety thermostat

15- Pump pressure switch

16- 3-bar safety valve

17- Pump pressure meter

18- One way valve

19- Adjustable bypass

20- System drain valve

21- System filling valve

22- D.h.w. inlet cock.

23- D.h.w. expansion vessel

24- 8-bar safety valve

25- Storage tank

26- Anode

27- D.h.w. NTC sensor

28- Storage tank coil

RI - System return

MI - System flow

RB - Storage tank return

MB - Storage tank flow

G - Gas supply

U - Hot d.h.w. outlet

E - Cold d.h.w. inlet

RC - Re-circulation (optional)

PRIMARY CIRCUIT (BOILER CIRCUIT)

The primary circuit, with relevant control and safety devices, operates every time there is a central

heating or d.h.w. request.

- OPERATION

The heat contained in the combustion products is absorbed by the copper blades of the water-gas

exchanger (5), which in turn transfers this to the water circulating inside by means of the boiler pump

(13).

When the boiler is working for water heating only, the water flows directly into the system, while it can

be deviated inside the storage tank coil (28) if combined with a PLUS unit.

This depends on the position of the 3-way electric valve (3) which, depending on the type of request,

allows the water to flow through the delivery pipe (M) and return pipe (R) system or causes its deviation

towards the storage tank coil (28).

Technical documentation Technical documentation

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EOLO SUPERIOR PLUS

- CIRCULATOR

This operates on the primary circuit return and is

located on the brass header assembly.

It is connected to the monobloc and exchanger by

means of threaded connecting pieces, while the

primary exchanger and expansion vessel are

connected by coupling pipes (2) with O.R. seal (3),

fastened with special forks (1).

- HEAD - FLOW GRAPH

The curve that represents the relation between the flow rate and the available head depends on

system bypass adjustment which, depending on its position, gives the system greater or less head.

The graph below refers to the pump operating at top speed with:

- A = Bypass disconnected (screw fully tightened)

- B = Standard bypass adjustment (screw tightened by 4.5 turns with respect to fully-tightened

position)

- C = Bypass open (screw fully loose)

- PRIMARY EXCHANGER

This is a water-gas blade type exchanger with

copper pipes and fins at the outlet of which an

NTC heating probe (5) is located.

The four pipes passing through the exchanger are

connected in parallel (1) two by two, to reduce

flow resistance to the utmost and provide a greater

available head.

It is connected to the pump flow and to the

primary circuit flow by means of coupling pipes

(2) with O.R. seal (4).

These are secured by means of special forks (3).

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STESP ed 02/02 7

EOLO SUPERIOR PLUS

- SAFETY DEVICES AND CONTROLS

System bypass (3)

This ensures water circulation in the primary circuit

(between flow and return) even when this is

prevented by the high resistance of the system.

It is mounted on a monobloc and can be adjusted by

means of a screw accessible from the bottom part of

the valve plate.

Pump pressure meter (1)

This detects the difference in pressure at pump

extremities.

Its housing is in the monobloc and is coupled to a

micro-switch that prevents burner operation in the

event of pump blockage or no water in the boiler

circuit.

Prevents primary exchanger overheating.

Automatic air vent (4)

Automatically expels any gaseous substances in

the boiler circuit.

Secured to the water side of the expansion vessel.

3-bar safety valve (2)

Fitted to the front part of the 3-way monobloc and

prevents safety pressure (3 bar) being exceeded in

the circuit.

When this trips, water exits from the flow pipe.

One way valve (7)

During domestic hot water production, this

prevents natural circulation occurring in the

central heating circuit.

Expansion vessel (5)

Compensates changes in volume following

heating of water and permits reducing pressure

changes.

It is fitted in the rear of the appliance and is

connected to the pump by means of the coupling

pipe (6).

It has a capacity of 8 l and a pre-load pressure of

0.8 bar.

Technical documentation Technical documentation

STESP ed 02/02

EOLO SUPERIOR PLUS

HYDRAULIC CIRCUIT

- SECONDARY CIRCUIT (D.H.W. CIRCUIT)

The domestic hot water circuit is engaged every time the water contained in the storage tank and

measured by means of the d.h.w. NTC sensor (4) has to be restored to the desired temperature.

- OPERATION

Following a d.h.w. request, the modulation board starts the boiler pump (1) and powers the motor of the

electric 3-way valve (2).

The consequent movement of the valve to d.h.w. position (see 3-way electric valve), closes the system

return pipe (RI) and, at the same time, opens the return pipe of the storage tank coil (RB).

This way, circulation is allowed in the coil (3) which, through its walls, enables the cold domestic water

to absorb the heat contained in the primary circuit water.

In this phase, the central heating function is disconnected as the production of d.h.w. has priority.

- HEAD - FLOW TO STORAGE TANK GRAPH

To ensure the heat exchange of the

entire nominal heat output of the boiler,

the hydraulic connection to the PLUS

unit (optional) must have flow

resistances below those shown on the

graph alongside.

Technical documentation Technical documentation

STESP ed 02/02 9

EOLO SUPERIOR PLUS

- STORAGE TANK UNIT (optional)

The PLUS storage tank units ( 80 l, 105 l and 120

l) consist of a coil storage tank unit insulated with

polystyrene supplied complete with covering and

instrument panel.

The storage tank is made entirely of AISI 316 L

stainless steel and consists of an outer jacket

enclosed in the top part by a flange secured by 12

screws.

Inside is a coil (two in the case of the 120 l model)

consisting of a concentric-spiral shaped stainless-

steel pipe that develops in the bottom part of the

storage tank and through the walls of which the

heat exchange occurs between the hot water of the

primary circuit and the water in the storage tank.

This ensures the water in the storage tank is always

at a constant temperature and, in the case of a water

request, results in the instantaneous production of

hot water.

If necessary, the coil can be removed from the

storage tank after taking off the upper inspection

flange.

The storage tank unit is complete with a series of

devices that not only ensure proper operation, but

also protect its integrity:

Anode (6)

This is fitted in the storage tank and protects this

against the effects of galvanic currents.

It is screwed onto the upper flange.

Polyphosphate metering unit (optional)

Prevents limestone deposits on the coil walls.

The kit is fitted at the cold domestic water inlet.

Safety valve unit (14)

This assembly is located in the top part of the storage

unit near the cold domestic water inlet.

Besides an 8-bar valve (“7” d.h.w. circ.) which

prevents safety pressure being exceeded inside the

storage tank, it comprises:

- a flow limiting device - 12 l/min (80 l and 105 l

versions only)

- an one way valve (“8” d.h.w. circ.) to prevent the

increase in pressure resulting from d.h.w heating

causing a return towards the cold water system.

ON-OFF thermostat kit (12) (optional)

Adapts operation of the storage tank unit to systems

with ON-OFF type temperature control.

It consists of a thermostat, the bulb of which is fitted

in place of the NTC sensor which is electrically

connected to the terminal board of the storage tank

instrument panel.

Adjustment is made from the control panel after

having removed the special plate (13).

Re-circulation kit (11) (optional)

Permits connecting the pipes of any d.h.w. re-

circulation system.

It consists of a pipe that is fitted in the storage tank

after removing the anode (7) and the relevant cap.

When the kit is installed, the anode (7) must be

screwed onto the end of the pipe.

D.h.w. drainage valve (10)

This is a brass cap complete with hose connection

located (screwed) onto the outer wall of the

storage tank by means of which the water inside

the tank can be drained off.

NTC Storage tank sensor (NB) (4)

Enables the modulation board to determine the

temperature of the water in the storage tank.

It is fitted in a bulb holder in contact with the outer

wall of the storage tank.

D.h.w. expansion vessel (9)

Compensates changes in volume caused by the heating

of the water in the storage tank.

The 80 l and 105 l versions have a capacity of 4 l,

while the 120 l version holds 5 l.

PLUS 80 l UNIT

Technical documentation Technical documentation

STESP ed 02/02

1010

EOLO SUPERIOR PLUS

- MOTORISED 3-WAY VALVE

This is a 3-way electric valve operating on the return pipe of the primary circuit that permits,

according to the type of request (d.h.w. or central heating), running boiler water into the central

heating system or into the storage tank coil.

This depends on the position of the shutter (3) which impedes transit towards the system and at the

same time permits this towards the storage tank (d.h.w. position) or vice versa (central- heating

position).

Movement of the shutter (3) in both positions is achieved by energising the motor (1).

Operation

When the central heating or d.h.w. position has

to be achieved, the motor (1) is operated by the

modulation board.

Operation of the motor, whose number of revs

is reduced by a special system of gears,

involves rotation of a disc (6) fastened

eccentrically on the shaft of the motor.

Movement of this disc causes the movement of

a special coupling (5) which, at each 180°

rotation, compresses (d.h.w. position) or

releases (heating position) the contrast spring

of the shutter (4).

Hydraulic achievement of the required position

causes, alternately, the opening of a limit

switch (2) and the closing of the other.

This permits de-energising the motor and

locking this in the achieved position, and

enabling motor operation only when a different

request is made (d.h.w. or central- heating

signal).

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