Immergas EOLO Mini Manuale utente

EOLO Mini

24-28 kW Special

Compact wall-hung

instantaneous boilers

with sealed-room

EOLO Mini 24-28 kW Special

STEMkW Special ed 01/08 EOLO Mini kW Special

Technical Documentation Technical Documentation

EOLO Mini 24-28 kW Special

Compact instantaneous wall-hung room sealed

fan-assisted boiler (type C).

EOLO Mini 24 kW Special

EOLO Mini 28 kW Special

EOLO Mini kW Special is a wall-hung room-sealed fan-assi-

sted boiler (type C) for central heating and producing domestic

hot water, characterised by its extremely compact size.

e boiler is available with an output power of 24 kW Special

(20,640 kcal/h) and 28 kW Special (24,080 kcal/h).

e boilers of the EOLO Mini kW Special series are type-

approved also for installation outside the building in a partly

sheltered location.

Note: By a partly sheltered location we mean a place where the

appliance is not exposed directly to the weather (rain, snow, hail,

etc.).

e boiler is tted with a new microprocessor controlled p.c.b.

that electronically controls burner ignition, central heating and

d.h.w. temperatures and continuous ame modulation.

With the new electronics the boiler can be connected to a

Remote Control (CAR or CRD) letting you easily control the

boiler remotely.

One of the standard features on the boiler is an antifreeze

system that protects against temperatures as low as -5°C

(optional down to -15°C).

e hydraulic circuit is equipped with a water-gas exchan-

ger in copper, a pump group made in a composite material

and a new 3-way electric valve group that allows, according

to requirements, boiler water to circulate in the central heating

system or in a STAINLESS STEEL plate exchanger for the

General features.

instant production of domestic hot water. e primary circuit

is tted with an automatic by-pass and a 3-bar safety valve.

A d.h.w. ow switch enables boiler activation if there is a

d.h.w. request.

e supply of combustion air inside the sealed chamber and

the expulsion of fumes are ensured by a fan whose correct

operation is controlled by a dierential pressure switch.

e boiler’s operating parameters are set by turning the knobs,

with the visual display of status, mode and malfunctions by

means of the LEDs on the easy-to-read display panel.

STEMkW Special ed 01/08 EOLO Mini kW Special

Technical DocumentationTechnical Documentation

Legend:

G - Gas supply

AC - Domestic hot water ow

AF - Domestic cold water inlet

R - C.h. return

M - C.h. ow

V - Power supply connection

EOLO Mini 24 kW Special main dimensions and connections.

EOLO Mini 28 kW Special main dimensions and connections.

Legend:

G - Gas supply

AC - Domestic hot water ow

AF - Domestic cold water inlet

R - C.h. return

M - C.h. ow

V - Power supply connection

Height (mm) Width (mm) Depth (mm)

790 450 310

Connections

GAS DOMESTIC

WATER SYSTEM

GAC AF R M

3/4” 1/2” 1/2” 3/4” 3/4”

Height (mm) Width (mm) Depth (mm)

790 450 250

Connections

GAS DOMESTIC

WATER SYSTEM

GAC AF R M

3/4” 1/2” 1/2” 3/4” 3/4”

STEMkW Special ed 01/08 EOLO Mini kW Special

Technical Documentation Technical Documentation

Legend:

1 - Sample point (A air) - (F ue)

2 - Fan

3 - D.h.w. ow switch

4 - Gas valve

5 - Filling valve

6 - Positive signal pressure point

7 - Negative signal pressure point

8 - Flue pressure switch

9 - Sealed chamber

10 - Flow probe

11 - Safety thermostat

12 - System expansion vessel

EOLO Mini 24 kW Special main components.

13 - Combustion chamber

14 - Automatic vent valve

15 - Boiler pump

16 - 3-bar safety valve

17 - D.h.w. heat exchanger

18 - 3-way valve (motorized)

19 - Automatic by-pass

20 - Draining valve

21 - Flue hood

22 - Primary heat exchanger

23 - Ignition and detection electrodes

24 - Burner

Note: Coupling system (OPTIONAL)

STEMkW Special ed 01/08 EOLO Mini kW Special

Technical DocumentationTechnical Documentation

Legend:

1 - Sample point (A air) - (F ue)

2 - Fan

3 - D.h.w. ow switch

4 - Gas valve

5 - Filling valve

6 - Positive signal pressure point

7 - Negative signal pressure point

8 - Flue pressure switch

9 - Sealed chamber

10 - Flow probe

11 - Safety thermostat

12 - System expansion vessel

13 - Combustion chamber

EOLO Mini 24 kW Special main components.

14 - Automatic vent valve

15 - Boiler pump

16 - 3-bar safety valve

17 - D.h.w. heat exchanger

18 - 3-way valve (motorized)

19 - Automatic by-pass

20 - Draining valve

21 - Flue hood

22 - Primary heat exchanger

23 - Ignition and detection electrodes

24 - Burner

Note: Coupling system (OPTIONAL)

STEMkW Special ed 01/08 EOLO Mini kW Special

Technical Documentation Technical Documentation

Legend:

1 - Burner operating LED

2 - D.h.w. operating LED

3 - C.h. operating LED

4 - Temperature LED - Malfunction - circulation insu-

cient

5 - Temperature LED - Malfunction - ow probe

6 - Temperature LED - Malfunction - ignition block

Control Panel.

7 - Temperature LED - Malfunction - overheating block

8 - Temperature LED - Malfunction - ue pressure switch

9 - D.h.w. stand-by selector/Remote Control - D.h.w. and C.h.-

Reset

10 - D.h.w. temperature selector

11 - C.h. temperature selector

12 - Boiler gauge

STEMkW Special ed 01/08 EOLO Mini kW Special

Technical DocumentationTechnical Documentation

Legend:

1 - D.h.w. ow switch

2 - Flow limiter

3 - Filling valve

4 - Gas valve

5 - Burner

6 - Primary heat exchanger

7 - Flue hood

8 - Fan

9 - Sealed chamber

10 - Flue pressure switch

11 - Flow probe

12 - Safety thermostat

13 - System expansion vessel

14 - Automatic vent valve

15 - Boiler pump

16 - D.h.w. heat exchanger

17 - 3-way valve (motorized)

18 - Automatic by-pass

19 - Draining valve

20 - 3-bar safety valve

G - Gas supply

AC - Domestic hot water ow

AF - Domestic cold water inlet

R - System return

M - System ow

Hydraulic circuit.

e primary circuit, with relevant control and safety devices,

is operated each time either a central heating or d.h.w.

request is made.

Operation.

e heat contained in the fumes produced by combustion

is absorbed by the copper blades of the water-gas primary

exchanger (6) which, in turn, transfers it to the water circula-

ting inside thanks to the boiler circulator (15).

e water is transferred directly into the system or can be

deviated to the instant stainless steel plate exchanger (16).

is depends on the position of the motorised 3-way diverter

valve (17) which, when idle allows the water to ow to the

d.h.w. exchanger (16) while if a central heating request is

made it deviates the ow to the system’s ow (M) and return

(R) pipes.

Primary circuit (Boiler Circuit).

e hot water for central heating and domestic use is produ-

ced by a primary and a secondary (d.h.w.) circuits that work

as required.

STEMkW Special ed 01/08 EOLO Mini kW Special

Technical Documentation Technical Documentation

Head ow rate graph.

e course of the curve that represents the ow rate/head ratio

available for the system depends on how fast the circulator is

working which, depending on the position, gives the system

a bigger or smaller head. e characteristic curves are shown

in the following graphs.

A = Head available to the system at third speed (with automatic by-pass)

B = Head available to the system at second speed (with automatic by-pass)

EOLO Mini 28 kW Special

EOLO Mini 24 kW Special

Head (m H2O)

Flow rate (l/h)

Head (kPa)

Head (m H2O)

Head (kPa)

Flow rate (l/h)

STEMkW Special ed 01/08 EOLO Mini kW Special

Technical DocumentationTechnical Documentation

Boiler circulator (1).

e pump works on the primary circuit return; it is part of the

pump body unit made in a composite material.

e automatic air vent (2) is housed directly on the body.

Primary exchanger (1).

It is a lamellar water-gas exchanger with copper tubes and ns

and at whose outlet (ow) the central heating NTC ow probe

(6) and the overtheating safety thermostat (2) are located.

e four pipes it is made of are connected in series (1).

It is connected to the circulator ow and to the primary circuit

ow by means of push-tted pipes (3) and O rings (5) and

locked with forks (4).

e exchangers of the 24 and 28 versions dier in the number

of ns (86 in the 24 version and 103 in the 28 version) and in the

dierent layout of the ow and return pipes (see drawing).

Flow

Return

Flow

Return

EOLO Mini 28 kW Special

EOLO Mini 24 kW Special

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