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2.1
BOILER ROOM
The boiler room should feature all the
characteristics required by standards
governing liquid fuel heating systems.
2.2
BOILER ROOM
DIMENSIONS
Position the boiler body on the founda-
tion bed, which should be at least 10 cm
high. The body should rest on a surface
allowing shifting, possibly by means of
sheet metal.
Leave a clearance between the boiler
and the wall of at least 0.60 m, and
between the top of the casing and the
ceiling of 1 m (0.50 m in the case of boil-
ers with incorporated D.H.W. tank).
The ceiling height of the boiler room
should not be less than 2.5 m.
2.3
CONNECTING
UP SYSTEM
When connecting up the water supply to
the boiler, make sure that the specifica-
tions given in fig. 1 are observed.
All connecting unions should be easy to
disconnect by means of tightening rings.
A closed expansion tank system must
be used.
2.3.1 Filling the
water system
Before connecting the boiler, thorough-
ly flush the system to eliminate scale
which could damage the appliance.
Filling must be done slowly to allow any
air bubbles to be bled off through the air
valves.
In closed-circuit heating systems, the
cold water filling pressure and the pre-
charging pressure of the expansion ves-
sel should be no less than or equal to the
height of the water head of the installa-
tion (e.g. for water head of 5 meters, the
vessel pre-charging pressure and instal-
lation filling pressure should be at least
0.5 bar/49 kPa).
2.3.2 Characteristics
of feedwater
Water supplying the heating circuit must
be treated in accordance with UNI-CTI
8065 standards.
It is absolutely essential to treat water
in the heating system in the following
cases:
– For extensive systems (with high con-
tents of water).
– Frequent addition of water into the sy-
stem.
– Should it be necessary to empty the
system either partially or totally.
2.3.3 D.H.W. storage tank
The 2R HE ErP boilers may be matched
with the separate boiler units.
The glass enamelled D.H.W. storage
tank comes with a magnesium anode
to protect the boiler and an inspection
flange for checking and cleaning.
The magnesium anode must be checked
annually and replaced if it is worn.
Fit a safety valve calibrated to 6 bar (588
kPa) on the tubing of the cold water sup-
ply to the boiler unit.
An case the system pressure is excessive
fit an appropriate pressure reducer.
If the safety valve calibrated to 6 bar (588
kPa) frequently intercepts, fit an expan-
sion vessel with a capacity of 8 litres and
a maximum pressure of 8 bar (784 kPa).
The tank should be of the membrane
type, made of natural rubber “caou-
tchouc”, which is suitable for foods.
2.4
CONNECTING UP FLUE
The flue is of fundamental importance for
the proper operation of the boiler; if not
installed in compliance with the stand-
ards, starting the boiler will be difficult
and there will be a consequent formation
of soot, condensate and encrustation.
The flue used to expel combustion prod-
ucts into the atmosphere must meet the
following requirements:
– be constructed with waterproof mate-
rials, and resistant to smoke tempera-
ture and condensate;
– be of adequate mechanical resilience
and of low heat conductivity;
– be perfectly sealed to prevent cooling
of the flue itself;
– be as vertical as possible; the terminal
section of the flue must be fitted with
a static exhaust device that ensures
constant and efficient extraction of
products generated by combustion;
– to prevent the wind from creating
pressure zones around the chimney
top greater than the uplift force of
combustion gases, the exhaust out-
let should be at least 0.4 m higher
than structures adjacent to the stack
(including the roof top) within 8 m;
– have a diameter that is not inferior
to that of the boiler union: square or
rectangular-section flues should have
an internal section 10% greater than
that of the boiler union;
– the useful section of the flue must
conform to the following formula:
S resulting section in cm
2
K reduction coefficient for liquid
fuels:
– 0.045 for firewood
– 0.030 for coal
– 0.024 for light oil
– 0.016 for gas
P boiler input in kcal/h
H height of flue in meters, measured
from the flame axis to the top of
the flue reduced by:
– 0.50 m for each change of direc-
tion of the connection union
between boiler and flue;
– 1.00 m for each metre of union
itself.
2.5
ELECTRICAL CONNECTION
(fig. 6)
The boiler is fitted with an electricity
cable, and requires a 1ph - 230V - 50Hz
power supply through the main switch
protected by fuses.
The room thermostat (required for
enhanced room temperature control)
should be installed as shown in fig. 6.
Connect the burner with the cable sup-
plied.
NO TE: Device must be connected to an
efficient earthing system.
SI ME de cli nes all responsibility for inju-
ry caused to persons due to failure to
earth the boiler.
Always turn off the power supply before
doing any work on the electrical panel.
P
S = K
√H
2 INSTALLATION
ATTENTION: Before performing any work on the boiler, make sure that the same and its components have
cooled in order to prevent the risk of burns due to high temperatures.
