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1.7 VENTILATION OF THE ROOMS.
In the room in which the boiler is installed it is
necessary that at least as much air ows as that
requested for by normal combustion of the gas
and ventilation of the room. Natural air ow must
take place directly through:
- permanent openings in the walls of the room
to be ventilated that lead towards the outside;
- ventilation pipes, individual or branched type.
e air used for ventilation must be withdrawn
directly from outside, in an area away from
sources of pollution. Natural air flow is also
allowed indirectly by air intake from adjoining
rooms. For further information relative to
ventilation of the rooms follow that indicated
by the standards in force and the following
modi cations and integrations.
Evacuation of foul air. In the rooms where
the gas appliances are installed it may also be
necessary, as well as the intake of combustion
agent air, to evacuate foul air, with consequent
intake of a further equal amount of clean air.
must be realised respecting the provisions of the
technical regulations in force.
1.8 FLUE DUCTS.
e gas appliances with attachment for the ue
gas discharge pipe must have direct connection
to chimneys or safely e cient ues.
The combustion products can be discharged
directly outside only if these are missing, as long
as the standard regulations for the ue terminal
are respected as well as the existing laws.
Connection to chimneys or flues. The
connection of the appliances to a chimney or
ue takes place by means of ue ducts.
In the event of ttings with pre-existing ues, these
must be perfectly clean because the detachment
of any waste from the walls during functioning,
could block the passage of ue gases, thus causing
extremely dangerous situations for the user.
e ue ducts must be connected to the chimney
or ue in the same room in which the appliance
is installed or, at most, in the adjoining room and
must comply with the requirements indicated by
the regulation.
1.9
FLUES/CHIMNEYS.
For the appliances with natural draught
individual chimneys and branched flues can
be used.
Individual chimneys.
e individual ues must
be dimensioned with respect to the standard
in force.
Branched ues. In buildings with lots of oors,
branched flues can be used for the natural
draught evacuation of combustion products. New
ues must be designed following the calculation
method and provisions of the regulation.
Chimney caps. A chimney cap is a device
crowning an individual chimney or collective
branched flue. The device facilitates the
dispersion of combustion products, even with
bad weather, and prevents the deposit of foreign
bodies.
It must meet the standard requirements
e outlet quota, corresponding to the top of the
chimney/ ue, independently of any caps, must
is
be out of the "back ow area", in order to prevent
the formation of counter-pressures that impede
the free discharge of the combustion products
into the atmosphere. It is therefore necessary
to use the minimum heights indicated in the
gures stated in the regulation, depending on
the slope of the roof.
Direct exhaust outside.
e natural draught
appliances, envisioned to be connected to a
chimney or a ue, can discharge the combustion
products directly to the outside, through a
pipe passing through the perimeter walls of
the building. In this case discharge takes place
through an exhaust ue, which is connected to
a draught terminal at the outside.
Exhaust flue. The exhaust flue must be in
compliance with the same requisites listed for
the ue ducts, with further provisions stated in
the regulation in force.
Positioning the exhaust terminals.
terminals must:
- be installed on external perimeter walls of the
building;
- be positioned according to the minimum
distances specified in current technical
standards.
Fume exhaust of forced draught appliances
in closed open-top environments. In spaces
closed on all sides with open tops (ventilation
pits, courtyards etc.), direct flue gas exhaust
is allowed for natural or forced draught gas
appliances with a heating power range from 4 to
35 kW, provided the conditions as per the current
technical standards are respected.
Important: it is prohibited to put the fumes
exhaust control device out of order voluntarily.
Every piece of this device must be replaced using
original spare parts if they have deteriorated. In
the case of repeated interventions of the fumes
exhaust control device, check the fumes exhaust
ue and the ventilation of the room in which the
boiler is located.
7
1.10 SYSTEM FILLING.
Once the boiler is connected, proceed with
system filling via the filling valve (Fig. 2-2).
Filling is performed at low speed to ensure
release of air bubbles in the water via the boiler
and heating system vents.
in automatic venting valve on the circulator.
Open the radiator vent valves. Close radiator
vent valves when only water escapes from them.
Close the lling valve when the boiler manometer
indicates approx. 1.2 bar.
N.B.: during these operations start up the
circulation pump at intervals, acting on the main
switch positioned on the control panel. Vent the
circulation pump by loosening the front cap and
keeping the motor running.
Tighten the cap a er the operation.
1.11 GAS SYSTEM START UP.
To start up the system, make reference to the
Standard:
is divides the systems and therefore
the start-up operations into three categories: new
systems, modi ed systems, re-activated systems.
In particular, for new gas systems:
- open windows and doors;
- avoid presence of sparks or open ames;
- bleed all air from the pipelines;
- check that the internal system is properly sealed
according to speci cations.
1.12 BOILER COMMISSIONING
IGNITION .
In order to issue the Declaration of Conformity
required by the regulations in force, one must
comply with the following requirements to
commission the boiler (the operations listed
below must only be performed by qualified
personnel and in the presence of sta only):
- check that the internal system is properly sealed
according to the regulations in force;
- make sure that the type of gas used corresponds
to boiler settings;
e exhaust
- check that there are no external factors that
may cause the formation of fuel pockets;
- switch the boiler on and check correct ignition;
- make sure that the gas ow rate and relevant
pressure values comply with those given in the
manual (par. 3.16);
- check the correct ventilation of the rooms;
- check the existing draught during normal
functioning of the appliance, e.g. a draught
gauge positioned at the exit of the appliance
combustion products;
- check that there is no back ow of combustion
products into the room, even during
functioning of fans;
- ensure that the safety device intervenes in the
event of gas supply failure and check the relative
intervention time;
- check activation of the main switch located
upstream of the boiler.
e boiler must not be started up even if only
one of the checks should be negative.
N.B.: the preliminary boiler check must be carried
out by an authorised company.
warranty is valid from the date of inspection.
e test certi cate and warranty is issued to the
user.
e boiler has a built-
e standard boiler
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