2.2.1
Filter on the gas pipe
The gas valve is supplied ex factory with an
inlet filter, which, however, is not adequate
to entrap all the impurities in the gas or in
gas main pipes.
To prevent malfunctioning of the valve, or in
certain cases even to cut out the safety
device with which the valve is equipped,
install an adequate filter on the gas pipe.
2.3
CHARACTERISTICS
OF FEEDWATER
To prevent lime scale or deposits on the pri-
mary exchanger, the water used to supply
the heating circuit should must be treated
in accordance with UNI-CTI 8065 stan-
dards.
It is absolutely essential that the water is to
be treated in the following cases:
– very extensive system (with high con-
tents of feedwater);
– frequent addition of makeup water into
the system;
– should it be necessar y to empty the
system either partially or totally.
2.4
SYSTEM FILLING
The charge pressure, with the system cold,
must be between
1
and
1.2 bar
.
During system filling you are recommended
to keep the main switch turned OFF.
Filling must be done slowly so as to allow
any air bubbles to be bled off through the
air valves.
At the end of the operation, make sure that
the cock has been properly closed.
2.5
EMPTYING
THE SYSTEM
Use the drain tap to empty the system.
Turn off the boiler before doing this.
2.6
FLUES/CHIMNEYS
The flue or chimney used to release the
products of combustion into the atmosphe-
re must comply with the requirements pro-
vided by the UNI 10641 regulations relative
to forced draught boilers (type C).
2.6.1
Passing flue pipes
through an
existing chimney
When renovating or passing flue pipes
through an existing chimney, use only flues
which are declared suitable for the purpo-
se by t he manuf actur er, f ollowing t he
instructions for installation and use provi-
ded by the manufacturer and by the pre-
scriptions of the UNI 10845 regulations.
2.7
ø 60/100 COAXIAL
DUCT INSTALLATION
The boiler is supplied with the connections
required for coaxial ducts that can be
turned in any direction.
The maximum horizontal length of the
duct must not exceed 2.8 meters.
Maximum two extensions can be inserted
on the C32 type installation in order to
reach the straight vertical length of 3
meters, including the concentric elbow
that comes out from the boiler.
Use only original SIME accessories and
make sure that the connection is carried
out properly, as indicated in the instruc-
tions attached to the accessories. The dia-
grams of fig. 3 show a few examples of
coaxial ducts kind of installations.
2.8
ø 80 SEPARATE PIPES
INSTALLATION
When installing the pipes, follow closely the
requirements of the current standards, as
well as the following practical indications:
– With direct intake from outside, when
the pipe is longer than 1 m, you are rec-
ommended to insulate the piping so as
to prevent formation of dew on the out-
side of the piping during certain periods
of the year.
– With the outlet pipe outside the building or
in cold indoor environments, insulation is
necessary to prevent burner failure while
starting. In such cases, provide for a con-
densate-collector system on the piping.
– If a segment of the flue passes through a
flammable wall, this segment must be
insulated with a 30 mm thick glass wool
39
Fig. 3
KEY
1
Coaxial duct code 8084809
2
Extension L. 815 code 8084804
3a Extension L. 580 c/w air-smoke intakes code 8086902
3b Extension L. 194 c/w air-smoke intakes code 8086906
4
Additional 90° elbow code 8085601
5
90° elbow c/w air-smoke intakes code 8085603
6
Articulated tile code 8091300
7
Roof outlet terminal L. 1284 code 8091200
IMPORTANT:
– Each additional 90° curve installed reduces the
available length by 0.90 metres.
– Each additional 45° curve installed reduces the
available length by 0.45 metres.
TYPE OF INSTALLATIONS
C12
Wall outlet and intake exposed to the same wind conditions.
C32 Roof outlet and intake exposed to the same wind conditions.
C42 Outlet and intake in common separated flues, but exposed to the same
wind conditions.
