18
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1.18 FLUES, CHIMNEYS, CHIMNEY
POTS AND TERMINALS.
The flues, chimneys and chimney pots for the
evacuation of combustion products must be in
compliance with applicable standards. Chimneys
and roof-installed exhaust terminals must com-
ply with the outlet height and with the distance
from technical volumes set forth by the technical
standards in force.
Positioning the wall flue exhaust terminals.
The
wall flue exhaust terminals must:
- be installed on external perimeter walls of the
building;
- be positioned according to the minimum dis-
tances specified in current technical standards.
Combustion products exhaust of natural
draught or fan assisted appliances in open-top
closed environments.
In spaces closed on all
sides with open tops (ventilation pits, court-
yards etc.), direct combustion product exhaust
is allowed for natural draught or fan assisted gas
appliances with a heat input range from 4 to 35
kW, provided the conditions as per the current
technical standards are respected.
1.19 SYSTEM FILLING.
Once the boiler is connected, proceed with sys-
tem filling via the filling cock (Fig. 2-11). Filling
is performed at low speed to ensure release of air
bubbles in the water via the boiler and central
heating system vents.
The pump may be noisy on start-up due to the
presence of air. This noise should stop after a
few minutes of functioning and however after
having correctly bled the air contained in the
hydraulic circuit.
The boiler incorporates an automatic vent valve
positioned on the boiler pump and one posi-
tioned on the hydraulic manifold.
Make sure
that the hoods are loosened.
Open the radiator
vent valves.
Close radiator vent valves when only water
escapes from them.
Close the filling cock when the boiler pressure
gauge indicates approx. 1.2 bar.
N.B.:
during these operations, turn on the circu-
lating pump at intervals using the main switch
on the control panel.
Vent the circulation pump
by loosening the front cap and keeping the motor
running and assuring that the liquid that escapes
cannot cause injury/damage to persons/objects.
Tighten the cap after the operation.
Attention:
to carry out the filling procedure
correctly, activate the "automatic vent" function,
see paragraph 3.15.
1.20 CONDENSATE TRAP FILLING.
On first lighting of the boiler combustion prod-
ucts may come out the condensate drain; after a
few minutes’ operation check that this no longer
occurs. This means that the trap is filled with
condensate to the correct level preventing the
passage of combustion products.
1.21 GAS SYSTEM START-UP.
To start up the system, refer to the technical
standard in force.
In particular, for new gas systems:
- open windows and doors;
- avoid presence of sparks or open flames;
- bleed all air from the pipelines;
- check that the internal system is properly sealed
according to the specifications set forth by
technical regulations in force.
1.22 BOILER START UP (IGNITION).
To commission the boiler (the operations listed
below must only be performed by a qualified firm
and without any unauthorised persons):
- check that the internal system is properly sealed
according to the specifications set forth by
technical regulations in force;
- make sure that the type of gas used corresponds
to boiler settings;
- Check that there are external factors that may
cause the formation of fuel pockets;
- switch the boiler on and check correct ignition;
- make sure that the gas flow rate and relevant
pressure values comply with those given in the
manual (Par. 3.19);
- ensure that the safety device intervenes in the
event of gas supply failure and check the relative
intervention time;
- check the intervention of the main switch
located upstream from the boiler and in the
boiler;
- check that the intake and/or exhaust terminals
(if fitted) are not blocked.
The boiler must not be started up even if only
one of the checks should be negative.
