Immergas MINI EOLO 28 3E, Instruction And Warning Booklet

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1.7  IMMERGAS FLUE SYSTEMS.

Immergas supplies various solutions separately 

from the boiler regarding the installation of air 

intake terminals and flue extraction, which are 

fundamental for boiler operation.

Important: The boiler must only be installed 

together with an original Immergas air intake 

and flue gas exhaust system. This system can be 

identified by an identification mark and special 

distinctive marking bearing the note: “not for 

condensing boilers”.

The flue exhaust pipes must not be in contact with 

or be near to flammable materials. Moreover, 

they must not pass through buildings or walls 

made of flammable material.
See following paragraphs for the detailed descrip-

tion of the kits available

Positioning of double lip seals.

For correct 

positioning of lip seals on elbows and exten-

sions, follow the direction of assembly given in 

figure (Fig. 1-6).
•  Resistance factors and equivalent lengths. Each 

flue extraction system component has a 

Resist-

ance Factor

 based on experimental tests and 

specified in the table below. The resistance fac-

tor for individual components is independent 

from the type of boiler on which it is installed 

or the actual dimensions. It is, however, condi-

tioned by the temperature of the fluids that pass 

through the pipe and therefore varies according 

to applications for air intake or flue exhaust. 

Each single component has a resistance cor-

responding to a certain length in metres of pipe 

of the same diameter; the so-called 

equivalent 

length

, obtained from the ration between the 

relative Resistance Factors. 

All boilers have an 

experimentally obtainable maximum Resistance 

Factor equal to 100

. The maximum Resistance 

Factor allowed corresponds to the resistance 

encountered with the maximum allowed pipe 

length for each type of Terminal Kit. This 

information enables calculations to be made 

in order to verify the possibility of various 

configurations of flue extraction systems.

1.8  OUTDOOR INSTALLATION IN 

PARTIALLY PROTECTED AREA.

N.B.:

a partially protected area is one in which the 

appliance is not exposed to the direct action of the 

weather (rain, snow, hail, etc..).

.

•  Configuration type B, open chamber and fan 

assisted.

The relevant terminal must be used for this 

configuration (present in the intake kit for the 

installation in question), which must be placed 

on the central hole of the boiler (Fig. 1-8). Air 

intake takes place directly from the environment 

in which the boiler is installed and flue exhaust 

in individual flue or to the outside.

In this configuration the boiler is classified as 

type B

22

.

With this configuration:

-  air intake takes place directly from the environ-

ment in which the boiler is installed and only 

functions in permanently ventilated rooms;

- the flue exhaust must be connected to its own 

individual flue or channelled directly into the 

external atmosphere.

The technical regulations in force must be 

respected.

• Fitting the cover kit.

 To assemble and confi-

gure the cover kit correctly, please refer to the 

relative instructions sheet.

Max. length of exhaust duct.

 The flue pipe 

(vertical or horizontal) can be 

extended to a 

max. length of 12 m straight route, using insulated 

pipes

 (Fig. 1-27). To prevent problems of fume 

condensate in the exhaust pipe Ø 80, due to fume 

cooling through the wall, 

the length of the pipe 

(not insulated) must be limited to just 5 m.

Example of installation with direct vertical 

terminal in partially protected location.

 When 

the vertical terminal for direct discharge of com-

bustion fumes is used, a minimum gap of 300 

mm must be left between the terminal and the 

balcony above. The height X+Y+Z+W evaluated 

with respect to the balcony above, must be equal 

to or more than 2000 mm. (Fig. 1-9). The term W 

must only be considered if the balcony above has 

closed balustrade (W=0 if the balustrade is open).

• Configuration without cover kit (boiler 

type C).

By leaving the side plugs fitted, it is possible 

to install the appliance externally, in partially 

covered places, without the cover kit. Installa-

tion takes place using the Ø60/100 and Ø80/125 

concentric horizontal intake/ exhaust kits. Refer 

to the paragraph relative to indoor installation. 

In this configuration the top cover kit guarantees 

additional protection for the boiler. It is recom-

mended but not compulsory.

Diaphragm installation.

 For correct functioning 

of the boiler it is necessary to install a diaphragm 

on the outlet of the sealed chamber and before the 

intake and exhaust pipe (Fig. 1-10). The choice 

of suitable diaphragm takes place on the basis 

of the type of pipe and its maximum extension: 

this calculation can be carried out using the 

following tables:

N.B.:

 the diaphragms are supplied together with 

the boiler.

Intake diaphragm installation. 

For correct 

boiler functioning with Ø 80 separator kits and 

drain measuring > 1 m a diaphragm Ø 47 must 

be installed on the sealed chamber intake hole 

and before the intake pipe (Fig. 1-11). The choice 

of suitable diaphragm takes place on the basis 

of the type of pipe and its maximum extension: 

this calculation can be carried out using the 

following tables: