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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.
1.21 WATER TREATMENT SYSTEM
FILLING.
As already mentioned in the previous para-
graphs, a treatment of the thermal and domestic
system water is required, in compliance with the
local standards in force.
The parameters that influence the duration and
proper operation of the heat exchanger are the
water's PH, hardness, conductivity, and oxygen,
together with the system's processing residues
(any welding residues), any oil present and cor-
rosion products that can, in turn, cause damage
to the heat exchanger.
In order to prevent this from happening, you are
recommended to:
- Before installation on new systems as well as
old ones, clean the system with clean water to
eliminate solid residues contained therein.
- Clean the system with a chemical treatment:
- Clean the new system with a suitable cleaning
device (for example Sentinel X300, Fernox
Cleaner F3 or Jenaqua 300) combined with
thorough washing.
- Clean the old system with a suitable cleaning
device (for example Sentinel X400 or X800,
Fernox Cleaner F3 or Jenaqua 400) combined
with thorough washing.
- Check the maximum hardness and quantity
of filling water referring to the graphics (Fig.
1-27). If the contents and hardness of the wa-
ter are below the indicated curve, no specific
treatment is required; otherwise, to limit the
content of calcium carbonate, you must provide
for water-filling treatment.
- For filling, you are not allowed to use water
softened with the use of ionic-exchange resins
or distilled water.
- Should you be required to provide for water
treatment, this should be carried out by
completely desalinating the filling water. As
opposed to the complete softening process,
desalinating the water completely not only
removes hardening agents (Ca, Mg), but also
eliminates all other minerals to reduce wa-
ter-filling conductivity up to 10 microsiemens/
cm. Given its low conductivity, desalinated
water does not only prevent the formation of
lime scale, but also serves as protection against
corrosion.
- Insert a suitable inhibitor / passivator (for
example Sentinel X100, Fernot Protector F1,
or Jenaqua 100); if required, also insert appro-
priate antifreeze (such as for example Sentinel
X500, Fernox Alphi 11 or Jenaqua 500).
- Check electrical conduction of the water, which
should not be lower than 2000 µs/cm in the case
of treated water and lower than 600 µs/cm in
the case of non-treated water.
- To prevent corrosion, the water system's PH
should be between 6.5 and 8.5.
- Check the maximum content of chlorides,
which should be less than 250 mg/l.
N.B.: for quantities and methods of use of wa-
ter-treatment products, refer to the instructions
provided by their manufacturer.
1.22 SYSTEM FILLING.
Once the boiler is connected, proceed with
system filling via the filling cock (Fig. 1-29 and
1-3). Filling is performed at low speed to ensure
release of air bubbles in the water via the boiler
and heating system vents.
The boiler has a built-in automatic venting valve
on the circulator. Check if the cap is loose. 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, enable the au-
tomatic vent functions on the boiler (active on
first ignition). Vent the boiler circulation pump
by loosening the front cap and keeping the motor
running. Tighten the cap after the operation.
1.23 CONDENSATE TRAP FILLING.
On first lighting of the boiler, flue gas may come
out the condensate drain; after a few minutes'
operation check that this no longer occurs. This
means that the drain trap is filled with conden-
sate to the correct level preventing the passage
of flue gas.
1.24 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.
Water hardness °F
18
18
1.25 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;
- ensure that the type of gas used corresponds to
the boiler settings (the type of gas appears on
the display on first electrical supply voltage, or
by checking the relative parameter "G");
- check connection to a 230V-50Hz power
mains, correct L-N polarity and earthing con-
nection;
- 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. 3.22);
- 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.
- Carry out the flue test and set the relative
parameter "F0".
The boiler must not be started up even if only
one of the checks should be negative.
N.B.: the graph refers to the
entire life cycle of the system.
Therefore, also consider sched-
uled and unscheduled mainte-
nance, which involves emptying
and filling the said system.
1-27
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