A chimney/ ue used to exhaust com bus tion
products must be designed as follows:
ducting must ensure sealing of combustion prod ucts, be wa-
terproof and insulated;terproof and insulated
construction in incombustible material suitable to resist
normal mechanical stress, heat and action of combustion
products or condensation;
ducting routed vertically without reductions/throt tles;
adequate insulation to avoid condensation or cool ing of
ue gas, in particular if installed outside the building or
in rooms without heating;
be adequately spaced, or, be tted with an air jack et for
insulation from zones with com bus ti ble and/or easily
installation of a solid materials col lec tion unit be low the rst
ue channel at a height of at least 500mm
designed with an internal circular, square or rec tan gu lar
section (in that latter two cases with round ed angles with
a radius no less than 20 mm). Hydraulically equivalent
sections are also ad mit ted;
installation of a chimney terminal at the top of the ue in
compliance with speci cations below and in compliance
without mechanical suction devices installed at the top of
in ues routed inside or against inhabited build ings, there
must be no risk of pressure surges.
ese devices are installed on sin gle or mul-
tiple ues, to facilitate dispersion of com bus tion products
also in adverse weather conditions and prevent deposit of
foreign matter. Chimney caps must meet the following
useful output section no less than double that of the ue/
suitably designed to prevent penetration of rain or snow
designed to ensure constant exhaust of com bus tion pro-
ducts with any direction or angle of wind.
e outlet height, corresponding to the height of the top of
the ue/chimney, regardless of chimney caps, must be outside
the “back ow zone”, to avoid the risk of counterpressure that
prevents the free re lease of combustion products into the
atmosphere. ere fore always observe the minimum heights
indicated in the gures in standards.
Positioning the draft terminals.
be installed on external perimeter walls of the build ing;
be positioned according to the min i mum distances speci-
ed in current technical standards.
Fumes exhaust on natural draught appliances in open
In spaces closed on all sides
with open tops (ventilation pits, light wells, inner court-
yards, etc.), direct discharge of fumes is allowed for natural
or forced draught gas appliances with a heat output from 4
to 35 kW, provided the speci cations of current technical
Once the boiler is connected, proceed with system lling via
the lling valve (see gure page 116).
Filling is performed at low speed to ensure release of air bub-
bles in the water via the boiler and heating sys tem vents.
e boiler is equipped with an automatic venting valve loca-
ted on the circulation pump. Check that the cap is loosened
and open the vent valves on the ra di a tors and close only when
Close the lling valve when the boiler pressure gauge indi-
: During this operation, activate the circulation pump at
regular intervals by means of the main switch on the control
Vent the circulation pump by loosening the front cap and
keeping the motor run ning.
Tighten the cap on completion.
To start up the system proceed as follows:
avoid presence of sparks or naked ames;
vent all air from pipelines;
check gas intake sealing e ciency with the boiler gas
shuto valve closed, checking that there is no gas transfer
Boiler start-up (ignition).
e following con di tions are required for boiler start-up:
ensure gas intake sealing e ciency with the shuto valves
closed and subsequently open with gas valve closed over
an interval of 10 minutes in which no gas transfer must
be detected by the meter;
ensure that the type of gas used corresponds to boiler
switch on the boiler and ensure correct ignition;
ensure that the gas ow rate and pressure values correspond
to manual speci cations (see page 122);
ensure that the safety device is engaged in the event of gas
supply failure and check activation time;
check activation of the main circuit-breaker switch up-
stream of the boiler and on the unit;
- check that the concentric intake/exhaust terminal (if tted)
e boiler must not be started up in the event of fail ure to
comply with any of the above.
Preliminary boiler testing must be performed by qual i ed per-
sonnel (e.g. free of charge by an Authorised Immergas Service
Centre). e boiler guarantee is valid as of the date of testing.
e test certi cate and guarantee is issued to the user on com-
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