Immergas EOLO Mini Guida

Technical documentation Technical documentation

STEME ed 07/03

EOLO MINI

EOLO Mini

Instantaneous wall-hung room

sealed fan assisted boiler with

compact dimensions

EOLO Mini

- GENERAL FEATURES

EOLO MINI is a wall-hung boiler for central heating and the production of domestic hot water that

stands out for its compact dimensions (773 x 450 x 250).

The boiler features a microprocessor-controlled electronic board that electronically controls burner

ignition, central heating and d.h.w. temperature and flame modulation.

The unit has a working heat output of 20.000 kcal/h (23,3 kW) and features a standard antifreeze safety

device that ensures operation with temperatures as low as –5°C.

The hydraulic circuit features a copper water-gas exchanger, a 3-way hydraulic valve and a

STAINLESS-STEEL plate exchanger for the instantaneous production of domestic hot water.

Combustion air intake inside the sealed chamber and the expulsion of flues are ensured by a fan. the

correct operation of which is controlled by a pressure switch.

- MAIN DIMENSIONS AND CONNECTIONS

DIMENSIONS (mm)

HEIGHT WIDTH DEPTH

773 450 250

CONNECTIONS

GAS HOT WATER SYSTEM

G U E R M

1/2 “ 1/2 “ 1/2 “ 3/4 “ 3/4 “

V - power connection

G - gas supply

U - domestic hot water outlet

E - domestic hot water inlet

R - system return

M - system flow

Technical documentation Technical documentation

STEME ed 07/03

EOLO MINI

MAIN COMPONENT PARTS

(until serial number 2238340)

1 - Flue sampling point

2 – Air sampling point

3 - Adjustment and limit NTC sensor

4 - 3-way hydraulic valve

5 - Gas valve

6 - System filling valve

7 - Positive signal pressure point

8 - Negative signal pressure point

9 - Fan safety pressure switch

10- Sealed room

11- Exchanger overheat safety (115 ºC)

12- Expansion vessel

13- Combustion chamber

14- Automatic air vent valve

15- Circulating pump

16- D.h.w. exchanger

17- 3 bar safety valve

18- System drain valve

19- Flue hood

20- Primary heat exchanger

21- Ignition and detection electrodes

22- Burner

23- Control panel

24- Fan

25- Overheat safety thermostat (100

ºC)

Technical documentation Technical documentation

STEME ed 07/03

EOLO MINI

MAIN COMPONENT PARTS

(from serial number 2238341)

1 - Sampling points (A=air) (F=flue)

2 - Fan

3 - 3-way hydraulic valve

4 - Gas valve

5 - System filling valve

6 - Positive signal pressure point

7 - Negative signal pressure point

8 - Fan safety pressure switch

9 - Sealed room

10- Overheat safety thermostat (105°C)

11- Adjustment and limit NTC sensor

12- Expansion vessel

13- Combustion chamber

14- Automatic air vent valve

15- Circulating pump

16- D.h.w. exchanger

17- 3 bar safety valve

18- System drain valve

19- Flue hood

20- Primary heat exchanger

21- Ignition and detection electrodes

22- Burner

23- Control panel

CONTROL PANEL

1 - Boiler thermo-pressure gauge

2 - Flame presence yellow indicator lamp

3 - Boiler block led indicator lamp

4 - 0/SUMMER/WINTER/RESET switch

5 - D.h.w. temperature selector

6 - Central heating temperature selector

7 - Programmer clock hole plate

Technical documentation Technical documentation

STEME ed 07/03

EOLO MINI

HYDRAULIC CIRCUIT

(until serial number 2238340)

(from serial number 2238341)

1 - System filling valve

2 - Hot water flow micro switch

3 - Gas valve

4 - 3-way hydraulic valve

5 - Adjustment and limit NTC sensor

6 - D.h.w exchanger

7 - Burner

8 - Primary exchanger

9 - Sealed room

10 - Fan

11 - Flue safety pressure switch

12 - Flue hood

13 - Overheating safety thermostat (TS1)

14 - Expansion vessel

15 - Automatic air vent valve

16 - Circulating pump

17 - Flow limiting device

18 - System drain valve

19 - 3-bar safety valve

20 - Overheat safety thermostat (TS2)

(fitted until serial number 2238340)

G - Gas supply

U - Hot water outlet

E - Hot water inlet

R - System return

M - System delivery

Technical documentation Technical documentation

STEME ed 07/03

EOLO MINI

The hot water used for central heating and the d.h.w. supply is produced by a primary circuit and a

secondary circuit (domestic hot water), which operate according to need.

PRIMARY CIRCUIT (BOILER CIRCUIT)

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

heating, domestic hot water request or antifreeze request.

- OPERATION

The heat contained in the flues produced by combustion is absorbed by the copper blades of the

water-gas exchanger (8) which, in turn, transfers this to the water that circulates inside by means

of the boiler pump (16).

The hot water then directly enters the heating system through the delivery pipe (M) and return

pipe (R).

- CIRCULATOR

This operates on the primary circuit return and

is physically located on the brass return

manifold unit.

It is connected to the monobloc and primary

exchanger by means of pipes with threaded

fittings.

The casing features a threaded fitting onto

which the automatic release valve (1) is

fastened.

- HEAD FLOW GRAPH

The curve representing the system flow and

head ratio depends on the speed of pump

operation.

The curves shown on the graph alongside

refer to:

- A = Circulator at top speed

- B = Circulator at second speed

- C = Circulator at top speed with by-pass

(optional) on

- D = Circulator at second speed with

by-pass (optional) on

Technical documentation Technical documentation

STEME ed 07/03

EOLO MINI “S”

- PRIMARY HEAT EXCHANGER

This is a blade type water-gas exchanger consisting of four pipes connected together in series.

This is connected to pump delivery (return) and to primary circuit delivery (delivery) by means

of coupling pipes (3) featuring O.R. seals (5) secured by means of special forks (4).

(until serial number 2238340)

At the outlet.(delivery) is the overheating safety

thermostat at 115 ºC (2).

The outlet pipe features the 100 °C safety

thermostat (6) and the NTC delivery sensor (7).

(from serial number 2238341)

At the outlet.(delivery) are the overheating safety

thermostat at 105 ºC (2) and the NTC delivery

sensor (7).

On the outlet pipe is fitted anything.

Technical documentation Technical documentation

STEME ed 07/03

EOLO MINI

- SAFETY DEVICES AND CONTROLS

System bypass (1) (optional)

Ensures circulation of water in the primary circuit

(between delivery and return) even when the high

resistance of the system does not permit.

It is fitted between the system delivery and return

connection pipes.

System filling valve

This cock is located between the boiler circuit and

the cold d.h.w. inlet and permits pressurising the

heating system

The housing is obtained in the lower part of the

three-way valve body to which it is screwed up.

(see no. “13” 3-way valve ).

System drain valve (3)

This is a brass cap featuring a hose connector

fitted (screwed) on the bottom part of the return

manifold (2).

By loosening this, the water of the primary circuit

can be externally released.

3-bar safety valve (4)

Prevents safety pressure being exceeded in the

circuit (3 bar).

It is connected in the front part of the manifold (2)

to which it is fitted on the side by a socket screw.

Operation of this valve causes water to run out of

the return pipe.

Automatic air vent (6)

Allows automatic expulsion of any gaseous

substances in the boiler circuit.

It is fitted to the delivery pipe of the pump directly

to the body.

Expansion vessel (7)

This compensates for any changes in volume

caused by water heating and permits restricting

pressure changes.

It is positioned on the right of the boiler alongside

the sealed chamber and has a pre-load pressure of

0.8 bar and a capacity of 6 l.

It is connected to the return manifold (2) by means

of a copper pipe (5) with threaded fittings.

Technical documentation Technical documentation

STEME ed 07/03

EOLO MINI

HYDRAULIC CIRCUIT

SECONDARY CIRCUIT (DOMESTIC HOT WATER CIRCUIT)

- OPERATION

A d.h.w. request causes cold water to flow through the 3-way valve (1) and its subsequent movement to

operating position (see hydraulic 3-way valve operation).

This causes the delivery pipe (M) to close with simultaneous opening of the passage towards the d.h.w.

exchanger (2).

This way, circulation is prevented in the heating system, while this does occur in the plate exchanger,

inside which the d.h.w. cold water absorbs the heat contained in the primary circuit water (see d.h.w.

exchanger).

During this stage, the central heating function is disengaged and d.h.w. production has priority.

- DOMESTIC HOT WATER

EXCHANGER

This is a water-water exchanger consisting of 13

stainless-steel plates, one over the other, on the

surface of which the boiler circuit water and d.h.w.

cold water run in counter-current, and by means of

which heat exchange between the two liquids occurs.

It is fitted horizontally and is connected to the 3-way

valve (primary circuit delivery), to the hot water

outlet pipe and to the return pipe of the primary

circuit by means of threaded unions with flat seal (1).

From serial number 1511772 for NIKE Mini and from

serial number 1507922 for EOLO Mini, the hydraulic

coupling to the 3-way valve (cold water inlet) is of

the coupling type with OR seal (2), while previously

it was obtained by means of a threaded union with flat

seal.

Technical documentation Technical documentation

STEME ed 07/03

EOLO MINI

- 3-WAY HYDRAULIC VALVE

Whenever a domestic hot water request is made, the 3-way valve has to deviate the flow of water

of the primary circuit from the central heating system to the plate exchanger.

It is therefore connected to both the primary circuit (primary circuit delivery, system delivery

and d.h.w. exchanger delivery) and to the d.h.w. circuit (cold water inlet, plate exchanger cold

water inlet).

The component part consists of a brass structure with inside an area where the transit (supply) of

d.h.w. is detected and another area where, as a result, deviation is made to the boiler circuit.

Inside are devices that carry out this function and which, if necessary, can be replaced using the

revision kit for three-way valves in which are fitted all the component parts subject to wear

(diaphragm, rods, OR, shutter, etc).

To perform this operation, the lid (6) will have to be removed and the two parts separated that

make up the valve body after loosening the socket-head retention screws (9).

The 3-way valve assembly also features the housings for the system filling stopcock (13) and

the 8 l/min flow limiting device (8).

Technical documentation Technical documentation

STEME ed 07/03

EOLO MINI

Idle position (central heating)

The thrust exercised by the spring “1”

affects the diaphragm plate “4” and the

d.h.w. valve “3” fastened to rod “5”.

The valve “2” is thus kept up tight

with consequent closing of the passage

towards the d.h.w. exchanger and the

simultaneous opening towards the

system delivery pipe (M).

Following a central heating request,

pump operation causes circulation in

the system through the delivery pipe

(M) and return pipe (R).

Operating position (d.h.w.)

The flow of domestic hot water inside

the valve invests the d.h.w. valve which,

when idle, is tight up against the plate of

the perforated diaphragm “4”.

Upon transit of the water, the pressure

downstream of valve “3” is less than that

upstream (“venturi effect”).

With a flow of at least 1.5 l/min and a

dynamic water pressure of 0.3 bar, the

pressure difference between the two

points is such as to cause movement of

diaphragm “4”.

This permits pressing spring “1” and the

release of spring “11” with the

consequent movement of valve “2” and

rods “5” and “6”.

In this condition, the delivery pipe (M) is

closed while the passage towards the

plate exchanger is open.

At the same time, rod “7” positions (drops) at the point of contact of rods “5” and “6” causing the

electrical closing of the d.h.w. microswitch “8”.

At the end of the supply, the pressure difference upstream and downstream of the d.h.w. valve “3” is

cancelled out, allowing the valve to return to idle position.

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